| 1 | /* ptrace.c -- Implement ptrace()
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| 2 | Copyright (c) 1994-1996 by Eberhard Mattes
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| 3 |
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| 4 | This file is part of emx.
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| 5 |
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| 6 | emx is free software; you can redistribute it and/or modify it
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| 7 | under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | emx is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with emx; see the file COPYING. If not, write to
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| 18 | the Free Software Foundation, 59 Temple Place - Suite 330,
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| 19 | Boston, MA 02111-1307, USA.
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| 20 |
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| 21 | As special exception, emx.dll can be distributed without source code
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| 22 | unless it has been changed. If you modify emx.dll, this exception
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| 23 | no longer applies and you must remove this paragraph from all source
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| 24 | files for emx.dll. */
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| 25 |
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| 26 |
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| 27 | #define INCL_DOSPROCESS
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| 28 | #define INCL_DOSSESMGR
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| 29 | #define INCL_DOSEXCEPTIONS
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| 30 | #define INCL_DOSMODULEMGR
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| 31 | #define INCL_DOSSEMAPHORES
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| 32 | #define INCL_DOSERRORS
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| 33 | #include <os2emx.h>
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| 34 | #include "clib.h"
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| 35 | #include <sys/signal.h>
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| 36 | #include <sys/ptrace.h>
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| 37 | #include <sys/user.h>
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| 38 | #include "reg.h"
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| 39 | #include <sys/errno.h>
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| 40 | #include <sys/uflags.h>
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| 41 | #include "emxdll.h"
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| 42 |
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| 43 | #define DR_SERVER_HEV_CLIENT 0x0001
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| 44 | #define DR_SERVER_HEV_SERVER 0x0002
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| 45 | #define DR_CLIENT_HEV_CLIENT 0x0004
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| 46 | #define DR_CLIENT_HEV_SERVER 0x0008
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| 47 | #define DR_LIST 0x0010
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| 48 |
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| 49 | #define SHAREMEM_FMT "/sharemem/emx/ptrace/%.8x.atc"
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| 50 |
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| 51 | #define REQ_ATTACH 17
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| 52 | #define REQ_DOSDEBUG 18
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| 53 | #define REQ_DETACH 19
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| 54 |
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| 55 | #define USEROFF(F) offsetof (struct user, F)
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| 56 | #define DBGOFF(F) offsetof (uDB_t, F)
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| 57 | #define CTXOFF(F) offsetof (CONTEXTRECORD, F)
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| 58 |
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| 59 | #define PTRACE_REG_COUNT sizeof (ptrace_regs) / sizeof (ptrace_regs[0])
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| 60 |
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| 61 | struct reg_table
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| 62 | {
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| 63 | ULONG reg;
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| 64 | ULONG user_offset;
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| 65 | ULONG dbg_offset;
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| 66 | ULONG ctx_offset;
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| 67 | BYTE len;
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| 68 | };
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| 69 |
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| 70 | struct co_regs
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| 71 | {
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| 72 | USHORT cw;
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| 73 | USHORT unused1;
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| 74 | USHORT sw;
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| 75 | USHORT unused2;
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| 76 | USHORT tw;
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| 77 | USHORT unused3;
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| 78 | ULONG fip;
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| 79 | USHORT fcs;
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| 80 | USHORT fop;
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| 81 | ULONG foo;
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| 82 | USHORT fos;
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| 83 | USHORT unused4;
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| 84 | BYTE fst[8][10];
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| 85 | };
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| 86 |
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| 87 | enum dbg_type
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| 88 | {
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| 89 | DT_LOCAL,
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| 90 | DT_SERVER,
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| 91 | DT_CLIENT
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| 92 | };
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| 93 |
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| 94 | struct debuggee
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| 95 | {
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| 96 | struct debuggee *next; /* Next debuggee */
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| 97 | enum dbg_type type; /* Type of debuggee */
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| 98 | ULONG resources; /* Acquired resources: DR_*. */
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| 99 | ULONG pid; /* Process ID */
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| 100 | ULONG sid; /* Session ID */
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| 101 | ULONG syscall_addr; /* Address of CALL _emx_syscall, or 0 */
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| 102 | ULONG layout_addr; /* Address of layout table, or 0 */
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| 103 | ULONG signo; /* Signal number, or 0 */
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| 104 | ULONG context; /* Address of exception context record, or 0 */
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| 105 | ULONG last_cmd; /* Last command */
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| 106 | ULONG regs[19]; /* Current registers */
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| 107 | ULONG exc_regs[19]; /* Registers for exception handler */
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| 108 | uDB_t dbgbuf; /* Buffer for DosDebug, includes registers */
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| 109 | struct co_regs dbgco; /* Floating point status */
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| 110 |
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| 111 | ULONG ptn; /* Notification for debugger */
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| 112 | ULONG ptn_hmte; /* For PTN_MODULE_LOAD and PTN_MODULE_FREE */
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| 113 | ULONG ptn_tid; /* For PTN_THREAD_NEW and PTN_THREAD_END */
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| 114 | ULONG ptn_pid; /* For PTN_PROC_NEW */
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| 115 | ULONG ptn_flags; /* For PTN_PROC_NEW */
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| 116 | ULONG ptn_fork_addr; /* For PTN_PROC_NEW */
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| 117 | char ptn_name[260]; /* For PTN_PROC_NEW */
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| 118 |
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| 119 | ULONG n_cmd; /* run() interrupted by notification: CMD */
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| 120 | ULONG n_tbreak; /* Ditto, TBREAK */
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| 121 | ULONG n_signo; /* Ditto, SIGNO */
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| 122 | ULONG n_tid; /* Ditto, TID */
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| 123 |
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| 124 | ULONG regs_tid; /* Registers retrieved for this thread */
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| 125 | ULONG server_request; /* Request for DosDebug server */
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| 126 | ULONG server_rc; /* Return code of DosDebug on server */
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| 127 | ULONG server_arg; /* Argument passed to server */
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| 128 | HEV hev_server; /* Data ready for DosDebug server */
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| 129 | HEV hev_client; /* Data ready for DosDebug client */
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| 130 |
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| 131 | BYTE regs_changed; /* Registers changed */
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| 132 | BYTE fpregs_ok; /* Floating point registers retrieved */
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| 133 | BYTE auto_switch; /* Automatic session switching enabled */
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| 134 | BYTE brk_flag; /* Break point hit */
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| 135 | BYTE more; /* Step/run again */
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| 136 | BYTE ptn_flag; /* Notification sent to debugger */
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| 137 | };
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| 138 |
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| 139 |
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| 140 | /* We keep a linked list of processes being debugged. */
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| 141 |
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| 142 | static struct debuggee *dbg_head;
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| 143 |
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| 144 | /* Here, we cache the most recently access debuggee. */
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| 145 |
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| 146 | static struct debuggee *dbg_cache;
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| 147 |
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| 148 | /* Table for converting between user struct offsets, uDB_t offsets,
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| 149 | and CONTEXTRECORD offsets. It also contains the lengths of the
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| 150 | members. */
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| 151 |
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| 152 | static struct reg_table const ptrace_regs[] =
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| 153 | {
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| 154 | {R_GS, USEROFF (u_regs[R_GS]), DBGOFF (GS), CTXOFF (ctx_SegGs), 2},
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| 155 | {R_FS, USEROFF (u_regs[R_FS]), DBGOFF (FS), CTXOFF (ctx_SegFs), 2},
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| 156 | {R_ES, USEROFF (u_regs[R_ES]), DBGOFF (ES), CTXOFF (ctx_SegEs), 2},
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| 157 | {R_DS, USEROFF (u_regs[R_DS]), DBGOFF (DS), CTXOFF (ctx_SegDs), 2},
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| 158 | {R_EDI, USEROFF (u_regs[R_EDI]), DBGOFF (EDI), CTXOFF (ctx_RegEdi), 4},
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| 159 | {R_ESI, USEROFF (u_regs[R_ESI]), DBGOFF (ESI), CTXOFF (ctx_RegEsi), 4},
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| 160 | {R_EBP, USEROFF (u_regs[R_EBP]), DBGOFF (EBP), CTXOFF (ctx_RegEbp), 4},
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| 161 | {R_ESP, USEROFF (u_regs[R_ESP]), DBGOFF (ESP), CTXOFF (ctx_RegEsp), 4},
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| 162 | {R_EBX, USEROFF (u_regs[R_EBX]), DBGOFF (EBX), CTXOFF (ctx_RegEbx), 4},
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| 163 | {R_EDX, USEROFF (u_regs[R_EDX]), DBGOFF (EDX), CTXOFF (ctx_RegEdx), 4},
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| 164 | {R_ECX, USEROFF (u_regs[R_ECX]), DBGOFF (ECX), CTXOFF (ctx_RegEcx), 4},
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| 165 | {R_EAX, USEROFF (u_regs[R_EAX]), DBGOFF (EAX), CTXOFF (ctx_RegEax), 4},
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| 166 | {R_EIP, USEROFF (u_regs[R_EIP]), DBGOFF (EIP), CTXOFF (ctx_RegEip), 4},
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| 167 | {R_CS, USEROFF (u_regs[R_CS]), DBGOFF (CS), CTXOFF (ctx_SegCs), 2},
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| 168 | {R_EFL, USEROFF (u_regs[R_EFL]), DBGOFF (EFlags), CTXOFF (ctx_EFlags), 4},
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| 169 | {R_UESP, USEROFF (u_regs[R_UESP]), DBGOFF (ESP), CTXOFF (ctx_RegEsp), 4},
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| 170 | {R_SS, USEROFF (u_regs[R_SS]), DBGOFF (SS), CTXOFF (ctx_SegSs), 2}
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| 171 | };
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| 172 |
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| 173 |
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| 174 | /* Prototypes for forward references. */
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| 175 |
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| 176 | static ULONG start_debug_descendant (struct debuggee *parent);
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| 177 | static ULONG start_debug_descendant_2 (struct debuggee *parent,
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| 178 | struct debuggee *child);
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| 179 | static ULONG do_attach (ULONG pid);
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| 180 | static ULONG do_detach (struct debuggee *d, ULONG addr);
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| 181 | static ULONG call_server (struct debuggee *d, ULONG request);
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| 182 | static ULONG free_debuggee (struct debuggee *d, ULONG return_value);
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| 183 |
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| 184 |
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| 185 | static const struct reg_table *user_addr (ULONG addr)
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| 186 | {
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| 187 | int i;
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| 188 |
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| 189 | for (i = 0; i < PTRACE_REG_COUNT; ++i)
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| 190 | if (ptrace_regs[i].user_offset == addr)
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| 191 | return &ptrace_regs[i];
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| 192 | return NULL;
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| 193 | }
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| 194 |
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| 195 |
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| 196 | static ULONG debug (struct debuggee *d, ULONG cmd)
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| 197 | {
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| 198 | ULONG rc;
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| 199 |
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| 200 | d->dbgbuf.Cmd = cmd;
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| 201 | d->dbgbuf.Pid = d->pid;
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| 202 | d->last_cmd = cmd;
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| 203 | if (d->type == DT_CLIENT)
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| 204 | {
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| 205 | rc = call_server (d, REQ_DOSDEBUG);
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| 206 | if (rc == 0)
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| 207 | rc = d->server_rc;
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| 208 | }
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| 209 | else
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| 210 | rc = DosDebug (&d->dbgbuf);
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| 211 | return (rc == 0 ? 0 : set_error (rc));
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| 212 | }
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| 213 |
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| 214 |
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| 215 | static ULONG debug_read_8 (struct debuggee *d, ULONG addr, BYTE *dst)
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| 216 | {
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| 217 | ULONG rc;
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| 218 |
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| 219 | d->dbgbuf.Addr = addr;
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| 220 | rc = debug (d, DBG_C_ReadMem);
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| 221 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success) return EIO;
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| 222 | *dst = (BYTE)d->dbgbuf.Value;
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| 223 | return 0;
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| 224 | }
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| 225 |
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| 226 |
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| 227 | static ULONG debug_read_16 (struct debuggee *d, ULONG addr, USHORT *dst)
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| 228 | {
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| 229 | ULONG rc;
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| 230 |
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| 231 | d->dbgbuf.Addr = addr;
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| 232 | rc = debug (d, DBG_C_ReadMem);
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| 233 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success) return EIO;
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| 234 | *dst = (USHORT)d->dbgbuf.Value;
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| 235 | return 0;
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| 236 | }
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| 237 |
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| 238 |
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| 239 | static ULONG debug_read_32 (struct debuggee *d, ULONG addr, ULONG *dst)
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| 240 | {
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| 241 | ULONG rc, w;
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| 242 |
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| 243 | d->dbgbuf.Addr = addr;
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| 244 | rc = debug (d, DBG_C_ReadMem);
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| 245 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success) return EIO;
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| 246 | w = d->dbgbuf.Value & 0xffff;
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| 247 | d->dbgbuf.Addr = addr + 2;
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| 248 | rc = debug (d, DBG_C_ReadMem);
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| 249 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success) return EIO;
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| 250 | w |= (d->dbgbuf.Value & 0xffff) << 16;
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| 251 | *dst = w;
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| 252 | return 0;
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| 253 | }
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| 254 |
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| 255 |
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| 256 | static void do_auto_switch (struct debuggee *d)
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| 257 | {
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| 258 | DosSelectSession (d->sid);
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| 259 | d->auto_switch = FALSE;
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| 260 | }
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| 261 |
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| 262 |
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| 263 | static int debug_poke16 (struct debuggee *d, ULONG addr, ULONG value)
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| 264 | {
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| 265 | ULONG rc;
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| 266 |
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| 267 | d->dbgbuf.Addr = addr;
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| 268 | d->dbgbuf.Value = value;
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| 269 | rc = debug (d, DBG_C_WriteMem);
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| 270 | if (rc == 0 && d->dbgbuf.Cmd != DBG_N_Success)
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| 271 | rc = EIO;
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| 272 | return rc;
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| 273 | }
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| 274 |
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| 275 |
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| 276 | /* Write the registers. TID is the thread ID (which must be
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| 277 | non-zero). Return errno. */
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| 278 |
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| 279 | static ULONG write_reg (struct debuggee *d, ULONG tid)
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| 280 | {
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| 281 | ULONG rc, i;
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| 282 |
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| 283 | if (d->regs_tid != tid)
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| 284 | return EIO;
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| 285 |
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| 286 | for (i = 0; i < PTRACE_REG_COUNT; ++i)
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| 287 | memcpy ((char *)&d->dbgbuf + ptrace_regs[i].dbg_offset,
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| 288 | &d->regs[ptrace_regs[i].reg], ptrace_regs[i].len);
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| 289 |
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| 290 | d->dbgbuf.Tid = tid;
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| 291 | rc = debug (d, DBG_C_WriteReg);
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| 292 | if (rc == 0 && d->dbgbuf.Cmd != DBG_N_Success)
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| 293 | rc = EIO;
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| 294 | if (rc == 0)
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| 295 | d->regs_changed = FALSE;
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| 296 | return rc;
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| 297 | }
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| 298 |
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| 299 |
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| 300 | /* Read the registers. TID is the thread ID (0 means the active
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| 301 | thread). Return errno. */
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| 302 |
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| 303 | static ULONG read_reg (struct debuggee *d, ULONG tid)
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| 304 | {
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| 305 | ULONG rc, i;
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| 306 | USHORT us;
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| 307 |
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| 308 | if (d->regs_tid != 0 && d->regs_tid == tid)
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| 309 | return 0;
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| 310 |
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| 311 | /* Read registers from a new or a different thread. Write back the
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| 312 | registers to the previous thread if required. */
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| 313 |
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| 314 | if (d->regs_changed)
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| 315 | write_reg (d, d->regs_tid);
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| 316 |
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| 317 | memset (d->regs, 0, sizeof (d->regs));
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| 318 | memset (d->exc_regs, 0, sizeof (d->exc_regs));
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| 319 |
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| 320 | d->dbgbuf.Tid = tid;
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| 321 | rc = debug (d, DBG_C_ReadReg);
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| 322 | if (rc == 0 && d->dbgbuf.Cmd != DBG_N_Success)
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| 323 | rc = EIO;
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| 324 | if (rc != 0) return rc;
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| 325 | for (i = 0; i < PTRACE_REG_COUNT; ++i)
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| 326 | memcpy (&d->regs[ptrace_regs[i].reg],
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| 327 | (char *)&d->dbgbuf + ptrace_regs[i].dbg_offset,
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| 328 | ptrace_regs[i].len);
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| 329 |
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| 330 | if (d->context != 0)
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| 331 | {
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| 332 | /* After an exception, get the registers from the exception
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| 333 | context record. */
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| 334 |
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| 335 | memcpy (d->exc_regs, d->regs, sizeof (d->exc_regs));
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| 336 | for (i = 0; i < PTRACE_REG_COUNT; ++i)
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| 337 | {
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| 338 | if (ptrace_regs[i].len == 4)
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| 339 | rc = debug_read_32 (d, d->context + ptrace_regs[i].ctx_offset,
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| 340 | &d->regs[ptrace_regs[i].reg]);
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| 341 | else
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| 342 | {
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| 343 | rc = debug_read_16 (d, d->context + ptrace_regs[i].ctx_offset,
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| 344 | &us);
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| 345 | d->regs[ptrace_regs[i].reg] = us;
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| 346 | }
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| 347 | if (rc != 0) return rc;
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| 348 | }
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| 349 | }
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| 350 | d->regs_tid = d->dbgbuf.Tid;
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| 351 | return rc;
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| 352 | }
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| 353 |
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| 354 |
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| 355 | /* Set a watchpoint. Return errno. */
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| 356 |
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| 357 | static ULONG set_watch (struct debuggee *d, ULONG addr, ULONG len, ULONG type)
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| 358 | {
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| 359 | ULONG rc;
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| 360 |
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| 361 | d->dbgbuf.Addr = addr;
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| 362 | d->dbgbuf.Len = len;
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| 363 | d->dbgbuf.Index = 0; /* Reserved */
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| 364 | d->dbgbuf.Value = type | DBG_W_Local;
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| 365 | rc = debug (d, DBG_C_SetWatch);
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| 366 | /* TODO: Check notification code? */
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| 367 | return rc;
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| 368 | }
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| 369 |
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| 370 |
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| 371 | static ULONG terminate (struct debuggee *d)
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| 372 | {
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| 373 | ULONG rc;
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| 374 |
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| 375 | d->regs_tid = 0; d->fpregs_ok = FALSE;
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| 376 | rc = debug (d, DBG_C_Term);
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| 377 | if (rc != 0)
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| 378 | return rc;
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| 379 | return free_debuggee (d, 0);
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| 380 | }
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| 381 |
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| 382 |
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| 383 | /* TODO: Have two register sets, see read_reg(). */
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| 384 |
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| 385 | static ULONG get_fpstate (struct debuggee *d)
|
|---|
| 386 | {
|
|---|
| 387 | ULONG rc, i, flags;
|
|---|
| 388 |
|
|---|
| 389 | if (d->context != 0)
|
|---|
| 390 | {
|
|---|
| 391 | /* After an exception, get the floating point state from the
|
|---|
| 392 | exception context record. */
|
|---|
| 393 |
|
|---|
| 394 | d->fpregs_ok = FALSE;
|
|---|
| 395 | memset (&d->dbgco, 0, sizeof (d->dbgco));
|
|---|
| 396 |
|
|---|
| 397 | rc = debug_read_32 (d, d->context + CTXOFF (ContextFlags), &flags);
|
|---|
| 398 | if (rc != 0) return rc;
|
|---|
| 399 |
|
|---|
| 400 | if (!(flags & CONTEXT_FLOATING_POINT))
|
|---|
| 401 | return 0;
|
|---|
| 402 |
|
|---|
| 403 | for (i = 0; i < sizeof (struct co_regs); i += 2)
|
|---|
| 404 | {
|
|---|
| 405 | rc = debug_read_16 (d, d->context + CTXOFF (ctx_env) + i,
|
|---|
| 406 | (USHORT *)((char *)&d->dbgco + i));
|
|---|
| 407 | if (rc != 0) return rc;
|
|---|
| 408 | }
|
|---|
| 409 | d->fpregs_ok = TRUE;
|
|---|
| 410 | return 0;
|
|---|
| 411 | }
|
|---|
| 412 | d->dbgbuf.Tid = 0; /* Thread: active thread */
|
|---|
| 413 | d->dbgbuf.Value = DBG_CO_387; /* Coprocessor type */
|
|---|
| 414 | d->dbgbuf.Buffer = (ULONG)&d->dbgco;
|
|---|
| 415 | d->dbgbuf.Len = sizeof (d->dbgco);
|
|---|
| 416 | d->dbgbuf.Index = 0; /* Reserved */
|
|---|
| 417 | rc = debug (d, DBG_C_ReadCoRegs);
|
|---|
| 418 | if (rc == 0 && d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 419 | rc = EIO;
|
|---|
| 420 | d->fpregs_ok = (rc == 0);
|
|---|
| 421 | return rc;
|
|---|
| 422 | }
|
|---|
| 423 |
|
|---|
| 424 |
|
|---|
| 425 | /* Return true if EIP points to a CALL instruction. Moreover, true is
|
|---|
| 426 | returned if an error occurs (to be on the safe side for
|
|---|
| 427 | automatically switching to the child session). */
|
|---|
| 428 |
|
|---|
| 429 | static int callp (struct debuggee *d)
|
|---|
| 430 | {
|
|---|
| 431 | ULONG eip, rc;
|
|---|
| 432 | BYTE b;
|
|---|
| 433 |
|
|---|
| 434 | /* Do not call read_reg() as that would set `d->regs_tid'. */
|
|---|
| 435 |
|
|---|
| 436 | d->dbgbuf.Tid = 0;
|
|---|
| 437 | rc = debug (d, DBG_C_ReadReg);
|
|---|
| 438 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 439 | return TRUE;
|
|---|
| 440 | eip = d->dbgbuf.EIP;
|
|---|
| 441 |
|
|---|
| 442 | /* Skip prefixes. */
|
|---|
| 443 |
|
|---|
| 444 | do
|
|---|
| 445 | {
|
|---|
| 446 | rc = debug_read_8 (d, eip++, &b);
|
|---|
| 447 | if (rc != 0) return TRUE;
|
|---|
| 448 | } while ((b & 0xe7) == 0x26 /* Segment override prefix */
|
|---|
| 449 | || b == 0x64 /* FS prefix */
|
|---|
| 450 | || b == 0x65 /* GS prefix */
|
|---|
| 451 | || b == 0x66 /* Operand size prefix */
|
|---|
| 452 | || b == 0x67); /* Address size prefix */
|
|---|
| 453 |
|
|---|
| 454 | /* Check for `CALL immediate' instruction. */
|
|---|
| 455 |
|
|---|
| 456 | if (b == 0xe8 || b == 0x9a) /* CALL near label, CALL far label*/
|
|---|
| 457 | return TRUE;
|
|---|
| 458 |
|
|---|
| 459 | /* Check for `CALL indirect' instruction. */
|
|---|
| 460 |
|
|---|
| 461 | if (b == 0xff)
|
|---|
| 462 | {
|
|---|
| 463 | rc = debug_read_8 (d, eip++, &b);
|
|---|
| 464 | if (rc != 0) return TRUE;
|
|---|
| 465 | /* Note: This was off by one bit in child.asm! */
|
|---|
| 466 | if ((b & 0x38) == 0x10) /* CALL near reg/mem */
|
|---|
| 467 | return TRUE;
|
|---|
| 468 | if ((b & 0x38) == 0x18) /* CALL far reg/mem */
|
|---|
| 469 | return TRUE;
|
|---|
| 470 | }
|
|---|
| 471 | return FALSE;
|
|---|
| 472 | }
|
|---|
| 473 |
|
|---|
| 474 |
|
|---|
| 475 | #define N_STOP (-1)
|
|---|
| 476 | #define N_CONTINUE_STOP (-2)
|
|---|
| 477 | #define N_CONTINUE_SEARCH (-3)
|
|---|
| 478 | #define N_CONTINUE_EXECUTION (-4)
|
|---|
| 479 | #define N_RESUME (-5)
|
|---|
| 480 | #define N_NOTIFY (-6)
|
|---|
| 481 |
|
|---|
| 482 |
|
|---|
| 483 | static void set_wait_cur_thread (struct debuggee *d, ULONG wait_ret)
|
|---|
| 484 | {
|
|---|
| 485 | ULONG rc, tid;
|
|---|
| 486 |
|
|---|
| 487 | if ((uflags & _UF_PTRACE_MODEL) != _UF_PTRACE_MULTITHREAD)
|
|---|
| 488 | tid = 0;
|
|---|
| 489 | else
|
|---|
| 490 | {
|
|---|
| 491 | d->dbgbuf.Tid = 0; /* Current thread */
|
|---|
| 492 | rc = debug (d, DBG_C_ReadReg);
|
|---|
| 493 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 494 | tid = 0;
|
|---|
| 495 | else
|
|---|
| 496 | tid = d->dbgbuf.Tid;
|
|---|
| 497 | }
|
|---|
| 498 | debug_set_wait (d->pid, tid, wait_ret, FALSE);
|
|---|
| 499 | }
|
|---|
| 500 |
|
|---|
| 501 |
|
|---|
| 502 | static int debug_signal (struct debuggee *d, int signo, int context_flag)
|
|---|
| 503 | {
|
|---|
| 504 | d->more = FALSE;
|
|---|
| 505 | set_wait_cur_thread (d, 0x7f | (signo << 8));
|
|---|
| 506 | if (context_flag)
|
|---|
| 507 | {
|
|---|
| 508 | d->context = d->dbgbuf.Len; /* Address of context buffer */
|
|---|
| 509 | d->signo = signo;
|
|---|
| 510 | }
|
|---|
| 511 | return 0;
|
|---|
| 512 | }
|
|---|
| 513 |
|
|---|
| 514 |
|
|---|
| 515 | static int n_exception (struct debuggee *d)
|
|---|
| 516 | {
|
|---|
| 517 | int rc;
|
|---|
| 518 | ULONG report, info, w;
|
|---|
| 519 |
|
|---|
| 520 | switch (d->dbgbuf.Value)
|
|---|
| 521 | {
|
|---|
| 522 | case DBG_X_PRE_FIRST_CHANCE: /* pre first chance */
|
|---|
| 523 | case DBG_X_STACK_INVALID: /* invalid stack */
|
|---|
| 524 | /* The exception number is in d->dbgbuf.Buffer. */
|
|---|
| 525 | if (d->dbgbuf.Buffer == XCPT_BREAKPOINT)
|
|---|
| 526 | {
|
|---|
| 527 | d->brk_flag = TRUE; d->more = FALSE;
|
|---|
| 528 | set_wait_cur_thread (d, 0x7f | (SIGTRAP << 8));
|
|---|
| 529 | return N_CONTINUE_STOP;
|
|---|
| 530 | }
|
|---|
| 531 | else if (d->dbgbuf.Buffer == XCPT_SINGLE_STEP)
|
|---|
| 532 | {
|
|---|
| 533 | d->more = FALSE;
|
|---|
| 534 | set_wait_cur_thread (d, 0x7f | (SIGTRAP << 8));
|
|---|
| 535 | return N_CONTINUE_STOP;
|
|---|
| 536 | }
|
|---|
| 537 | break;
|
|---|
| 538 |
|
|---|
| 539 | case DBG_X_FIRST_CHANCE: /* first chance */
|
|---|
| 540 | report = d->dbgbuf.Buffer; /* Address of report buffer */
|
|---|
| 541 | rc = debug_read_32 (d, report + offsetof (EXCEPTIONREPORTRECORD,
|
|---|
| 542 | ExceptionNum), &w);
|
|---|
| 543 | if (rc == 0)
|
|---|
| 544 | switch (w)
|
|---|
| 545 | {
|
|---|
| 546 | case XCPT_GUARD_PAGE_VIOLATION:
|
|---|
| 547 | case XCPT_PROCESS_TERMINATE:
|
|---|
| 548 | case XCPT_ASYNC_PROCESS_TERMINATE:
|
|---|
| 549 | return N_CONTINUE_SEARCH;
|
|---|
| 550 |
|
|---|
| 551 | case XCPT_ACCESS_VIOLATION:
|
|---|
| 552 | case XCPT_DATATYPE_MISALIGNMENT:
|
|---|
| 553 | return debug_signal (d, SIGSEGV, TRUE);
|
|---|
| 554 |
|
|---|
| 555 | case XCPT_INTEGER_DIVIDE_BY_ZERO:
|
|---|
| 556 | case XCPT_INTEGER_OVERFLOW:
|
|---|
| 557 | case XCPT_ARRAY_BOUNDS_EXCEEDED:
|
|---|
| 558 | case XCPT_FLOAT_DENORMAL_OPERAND:
|
|---|
| 559 | case XCPT_FLOAT_DIVIDE_BY_ZERO:
|
|---|
| 560 | case XCPT_FLOAT_INEXACT_RESULT:
|
|---|
| 561 | case XCPT_FLOAT_INVALID_OPERATION:
|
|---|
| 562 | case XCPT_FLOAT_OVERFLOW:
|
|---|
| 563 | case XCPT_FLOAT_STACK_CHECK:
|
|---|
| 564 | case XCPT_FLOAT_UNDERFLOW:
|
|---|
| 565 | return debug_signal (d, SIGFPE, TRUE);
|
|---|
| 566 |
|
|---|
| 567 | case XCPT_ILLEGAL_INSTRUCTION:
|
|---|
| 568 | case XCPT_INVALID_LOCK_SEQUENCE:
|
|---|
| 569 | case XCPT_PRIVILEGED_INSTRUCTION:
|
|---|
| 570 | return debug_signal (d, SIGILL, TRUE);
|
|---|
| 571 |
|
|---|
| 572 | case XCPT_SIGNAL:
|
|---|
| 573 | info = offsetof (EXCEPTIONREPORTRECORD, ExceptionInfo) + 0;
|
|---|
| 574 | rc = debug_read_32 (d, report + info, &w);
|
|---|
| 575 | if (rc == 0)
|
|---|
| 576 | switch (w)
|
|---|
| 577 | {
|
|---|
| 578 | case XCPT_SIGNAL_INTR:
|
|---|
| 579 | return debug_signal (d, SIGINT, TRUE);
|
|---|
| 580 |
|
|---|
| 581 | case XCPT_SIGNAL_BREAK:
|
|---|
| 582 | return debug_signal (d, SIGBREAK, TRUE);
|
|---|
| 583 |
|
|---|
| 584 | case XCPT_SIGNAL_KILLPROC:
|
|---|
| 585 | return debug_signal (d, SIGTERM, TRUE);
|
|---|
| 586 | }
|
|---|
| 587 | break;
|
|---|
| 588 |
|
|---|
| 589 | default:
|
|---|
| 590 | return debug_signal (d, SIGSEGV, TRUE);
|
|---|
| 591 | }
|
|---|
| 592 | break;
|
|---|
| 593 |
|
|---|
| 594 | case DBG_X_LAST_CHANCE: /* last chance */
|
|---|
| 595 |
|
|---|
| 596 | return N_CONTINUE_SEARCH;
|
|---|
| 597 | }
|
|---|
| 598 |
|
|---|
| 599 | return debug_signal (d, SIGSEGV, FALSE);
|
|---|
| 600 | }
|
|---|
| 601 |
|
|---|
| 602 |
|
|---|
| 603 | /* Possible notification for the debugger. */
|
|---|
| 604 |
|
|---|
| 605 | static int notify (struct debuggee *d, int ptn)
|
|---|
| 606 | {
|
|---|
| 607 | if ((uflags & _UF_PTRACE_MODEL) == _UF_PTRACE_STANDARD)
|
|---|
| 608 | return N_CONTINUE_STOP;
|
|---|
| 609 | set_wait_cur_thread (d, 0x7f | (SIGPTRACENOTIFY << 8));
|
|---|
| 610 | d->ptn = ptn;
|
|---|
| 611 | d->ptn_flag = TRUE;
|
|---|
| 612 | return N_NOTIFY;
|
|---|
| 613 | }
|
|---|
| 614 |
|
|---|
| 615 |
|
|---|
| 616 | /* Handle the current notification and return N_STOP, N_CONTINUE_STOP,
|
|---|
| 617 | N_CONTINUE_SEARCH, N_RESUME, or errno (non-negative). */
|
|---|
| 618 |
|
|---|
| 619 | static int notification (struct debuggee *d)
|
|---|
| 620 | {
|
|---|
| 621 | int rc;
|
|---|
| 622 |
|
|---|
| 623 | switch (d->dbgbuf.Cmd)
|
|---|
| 624 | {
|
|---|
| 625 | case DBG_N_Success:
|
|---|
| 626 |
|
|---|
| 627 | /* The request was completed successfully. Run or step again
|
|---|
| 628 | unless `d->more' has been set to FALSE. */
|
|---|
| 629 |
|
|---|
| 630 | if (d->more)
|
|---|
| 631 | return N_RESUME;
|
|---|
| 632 |
|
|---|
| 633 | /* Running or stepping the debuggee is completed. Read the
|
|---|
| 634 | registers. Skip over INT3 if a breakpoint was hit. */
|
|---|
| 635 |
|
|---|
| 636 | rc = read_reg (d, 0);
|
|---|
| 637 | if (rc == 0 && d->brk_flag)
|
|---|
| 638 | {
|
|---|
| 639 | /* Skip the INT3 instruction for compatibility with emx.exe
|
|---|
| 640 | and GDB. */
|
|---|
| 641 |
|
|---|
| 642 | d->regs[R_EIP] += 1; /* Skip INT3 */
|
|---|
| 643 | d->regs_changed = TRUE;
|
|---|
| 644 | }
|
|---|
| 645 | return rc; /* ptrace() successful (usually) */
|
|---|
| 646 |
|
|---|
| 647 | case DBG_N_Error:
|
|---|
| 648 |
|
|---|
| 649 | /* An error occured. */
|
|---|
| 650 |
|
|---|
| 651 | #if 0
|
|---|
| 652 | oprintf ("DosDebug (%d) error: %d\r\n",
|
|---|
| 653 | (int)d->last_cmd, (int)d->dbgbuf.Value);
|
|---|
| 654 | #endif
|
|---|
| 655 | return set_error (d->dbgbuf.Value);
|
|---|
| 656 |
|
|---|
| 657 | case DBG_N_ProcTerm:
|
|---|
| 658 |
|
|---|
| 659 | /* Process terminated. Let wait() return the termination
|
|---|
| 660 | code. */
|
|---|
| 661 |
|
|---|
| 662 | debug_set_wait (d->pid, 0, (d->dbgbuf.Value & 0xff) << 8, TRUE);
|
|---|
| 663 | d->more = FALSE;
|
|---|
| 664 | rc = terminate (d);
|
|---|
| 665 | return rc; /* ptrace() successful (usually) */
|
|---|
| 666 |
|
|---|
| 667 | case DBG_N_Exception:
|
|---|
| 668 |
|
|---|
| 669 | /* An exception occured. */
|
|---|
| 670 |
|
|---|
| 671 | return n_exception (d);
|
|---|
| 672 |
|
|---|
| 673 | case DBG_N_ModuleLoad:
|
|---|
| 674 | d->ptn_hmte = d->dbgbuf.Value;
|
|---|
| 675 | return notify (d, PTN_MODULE_LOAD);
|
|---|
| 676 |
|
|---|
| 677 | case DBG_N_ModuleFree:
|
|---|
| 678 | d->ptn_hmte = d->dbgbuf.Value;
|
|---|
| 679 | return notify (d, PTN_MODULE_FREE);
|
|---|
| 680 |
|
|---|
| 681 | case DBG_N_ThreadCreate:
|
|---|
| 682 | d->ptn_tid = d->dbgbuf.Tid;
|
|---|
| 683 | return notify (d, PTN_THREAD_NEW);
|
|---|
| 684 |
|
|---|
| 685 | case DBG_N_ThreadTerm:
|
|---|
| 686 | rc = notify (d, PTN_THREAD_END);
|
|---|
| 687 | if (rc == N_NOTIFY)
|
|---|
| 688 | {
|
|---|
| 689 | d->dbgbuf.Tid = 0;
|
|---|
| 690 | if (debug (d, DBG_C_ReadReg) != 0 || d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 691 | rc = EINVAL;
|
|---|
| 692 | else
|
|---|
| 693 | d->ptn_tid = d->dbgbuf.Tid;
|
|---|
| 694 | }
|
|---|
| 695 | return rc;
|
|---|
| 696 |
|
|---|
| 697 | case DBG_N_NewProc:
|
|---|
| 698 | rc = notify (d, PTN_PROC_NEW);
|
|---|
| 699 | if (rc == N_NOTIFY)
|
|---|
| 700 | {
|
|---|
| 701 | d->ptn_pid = d->dbgbuf.Value;
|
|---|
| 702 | d->ptn_name[0] = 0;
|
|---|
| 703 | d->ptn_fork_addr = 0;
|
|---|
| 704 | d->ptn_flags = 0;
|
|---|
| 705 | rc = start_debug_descendant (d);
|
|---|
| 706 | }
|
|---|
| 707 | return rc;
|
|---|
| 708 |
|
|---|
| 709 | case DBG_N_Watchpoint:
|
|---|
| 710 |
|
|---|
| 711 | /* Watchpoint hit. Watchpoints are currently used only for
|
|---|
| 712 | skipping over the call to emx_syscall when single-stepping.
|
|---|
| 713 | Stop the debuggee and let wait() indicate SIGTRAP. */
|
|---|
| 714 |
|
|---|
| 715 | d->more = FALSE;
|
|---|
| 716 | set_wait_cur_thread (d, 0x7f | (SIGTRAP << 8));
|
|---|
| 717 | return N_STOP;
|
|---|
| 718 |
|
|---|
| 719 | case DBG_N_AliasFree:
|
|---|
| 720 | default:
|
|---|
| 721 |
|
|---|
| 722 | /* These notifications are not expected to occur. */
|
|---|
| 723 |
|
|---|
| 724 | oprintf ("Unexpected DosDebug notification: %d\r\n",
|
|---|
| 725 | (int)d->dbgbuf.Cmd);
|
|---|
| 726 | quit (255);
|
|---|
| 727 | }
|
|---|
| 728 | }
|
|---|
| 729 |
|
|---|
| 730 |
|
|---|
| 731 | /* Perform a DBG_C_Go or DBG_C_SStep command. Set a breakpoint at
|
|---|
| 732 | address TBREAK, if non-zero. Send signal SIGNO, if non-zero. */
|
|---|
| 733 |
|
|---|
| 734 | static ULONG run (struct debuggee *d, ULONG cmd, ULONG tbreak, ULONG signo,
|
|---|
| 735 | ULONG tid)
|
|---|
| 736 | {
|
|---|
| 737 | ULONG rc;
|
|---|
| 738 | int next;
|
|---|
| 739 |
|
|---|
| 740 | d->ptn_flag = FALSE;
|
|---|
| 741 |
|
|---|
| 742 | /* For now, we support raising only that signal by which the
|
|---|
| 743 | debuggee has been stopped. */
|
|---|
| 744 |
|
|---|
| 745 | if (signo != 0 && signo != d->signo)
|
|---|
| 746 | return EINVAL;
|
|---|
| 747 |
|
|---|
| 748 | /* Automatically switch sessions now for DBG_C_Go. (For
|
|---|
| 749 | DBG_C_SStep, that will be done later, depending on the thread
|
|---|
| 750 | context.) */
|
|---|
| 751 |
|
|---|
| 752 | if (d->auto_switch && cmd == DBG_C_Go)
|
|---|
| 753 | do_auto_switch (d);
|
|---|
| 754 |
|
|---|
| 755 | /* Set a breakpoint at address TBREAK, if non-zero. This is used
|
|---|
| 756 | for avoiding stepping into emx.dll (which would confuse GDB). */
|
|---|
| 757 |
|
|---|
| 758 | if (tbreak != 0)
|
|---|
| 759 | {
|
|---|
| 760 | rc = set_watch (d, tbreak, 1, DBG_W_Execute);
|
|---|
| 761 | if (rc != 0) return rc;
|
|---|
| 762 | }
|
|---|
| 763 |
|
|---|
| 764 | /* If the debuggee has been stopped by an exception, special
|
|---|
| 765 | processing is required now. Note that DBG_C_Continue has not yet
|
|---|
| 766 | been performed in that case (still in first chance
|
|---|
| 767 | processing). */
|
|---|
| 768 |
|
|---|
| 769 | if (d->signo != 0)
|
|---|
| 770 | {
|
|---|
| 771 | if (signo == d->signo)
|
|---|
| 772 | {
|
|---|
| 773 | /* Restore the exception handler context, and call user
|
|---|
| 774 | exception handlers. */
|
|---|
| 775 |
|
|---|
| 776 | memcpy (d->regs, d->exc_regs, sizeof (d->regs));
|
|---|
| 777 | next = N_CONTINUE_SEARCH;
|
|---|
| 778 | }
|
|---|
| 779 | else
|
|---|
| 780 | {
|
|---|
| 781 | /* Restore the exception context (retrieved from the
|
|---|
| 782 | exception context record), and do not call user exception
|
|---|
| 783 | handlers. */
|
|---|
| 784 |
|
|---|
| 785 | next = N_CONTINUE_EXECUTION;
|
|---|
| 786 | }
|
|---|
| 787 | d->regs_changed = TRUE; /* Write back registers */
|
|---|
| 788 |
|
|---|
| 789 | /* Special processing of exception done (except for the action
|
|---|
| 790 | indicated by `next'. */
|
|---|
| 791 |
|
|---|
| 792 | d->context = 0;
|
|---|
| 793 | d->signo = 0;
|
|---|
| 794 | }
|
|---|
| 795 | else
|
|---|
| 796 | next = N_RESUME;
|
|---|
| 797 |
|
|---|
| 798 | /* If any registers have been changed, write them to the
|
|---|
| 799 | debuggee. */
|
|---|
| 800 |
|
|---|
| 801 | if (d->regs_changed)
|
|---|
| 802 | {
|
|---|
| 803 | rc = write_reg (d, d->regs_tid);
|
|---|
| 804 | if (rc != 0) return rc;
|
|---|
| 805 | }
|
|---|
| 806 |
|
|---|
| 807 | d->more = TRUE; d->brk_flag = FALSE;
|
|---|
| 808 | d->regs_tid = 0; d->fpregs_ok = FALSE;
|
|---|
| 809 |
|
|---|
| 810 | for (;;)
|
|---|
| 811 | {
|
|---|
| 812 | switch (next)
|
|---|
| 813 | {
|
|---|
| 814 | case N_RESUME:
|
|---|
| 815 | if (d->auto_switch && cmd == DBG_C_SStep && callp (d))
|
|---|
| 816 | do_auto_switch (d);
|
|---|
| 817 | d->dbgbuf.Tid = tid;
|
|---|
| 818 | rc = debug (d, cmd);
|
|---|
| 819 | if (rc != 0) return rc;
|
|---|
| 820 | break;
|
|---|
| 821 |
|
|---|
| 822 | case N_STOP:
|
|---|
| 823 | rc = debug (d, DBG_C_Stop);
|
|---|
| 824 | if (rc != 0) return rc;
|
|---|
| 825 | break;
|
|---|
| 826 |
|
|---|
| 827 | case N_CONTINUE_STOP:
|
|---|
| 828 | case N_CONTINUE_SEARCH:
|
|---|
| 829 | case N_CONTINUE_EXECUTION:
|
|---|
| 830 |
|
|---|
| 831 | d->dbgbuf.Tid = 0;
|
|---|
| 832 | rc = debug (d, DBG_C_ReadReg);
|
|---|
| 833 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 834 | d->dbgbuf.Tid = 1;
|
|---|
| 835 |
|
|---|
| 836 | if (next == N_CONTINUE_SEARCH)
|
|---|
| 837 | d->dbgbuf.Value = XCPT_CONTINUE_SEARCH;
|
|---|
| 838 | else if (next == N_CONTINUE_EXECUTION)
|
|---|
| 839 | d->dbgbuf.Value = XCPT_CONTINUE_EXECUTION;
|
|---|
| 840 | else
|
|---|
| 841 | d->dbgbuf.Value = XCPT_CONTINUE_STOP;
|
|---|
| 842 | rc = debug (d, DBG_C_Continue);
|
|---|
| 843 | if (rc != 0) return rc;
|
|---|
| 844 | break;
|
|---|
| 845 |
|
|---|
| 846 | case N_NOTIFY:
|
|---|
| 847 | d->n_cmd = cmd;
|
|---|
| 848 | d->n_tbreak = tbreak;
|
|---|
| 849 | d->n_signo = signo;
|
|---|
| 850 | d->n_tid = tid;
|
|---|
| 851 | return 0;
|
|---|
| 852 |
|
|---|
| 853 | default:
|
|---|
| 854 | /* errno value */
|
|---|
| 855 | return (ULONG)next;
|
|---|
| 856 | }
|
|---|
| 857 | next = notification (d);
|
|---|
| 858 | }
|
|---|
| 859 | }
|
|---|
| 860 |
|
|---|
| 861 |
|
|---|
| 862 | /* Read a 32-bit word from the layout table of the module, for
|
|---|
| 863 | find_module_layout(). Note that this macro uses local variables of
|
|---|
| 864 | find_module_layout(). */
|
|---|
| 865 |
|
|---|
| 866 | #define READ_LAYOUT(member,dst) \
|
|---|
| 867 | (debug_read_32 (d, addr_layout + offsetof (layout_table, member), dst) == 0)
|
|---|
| 868 |
|
|---|
| 869 |
|
|---|
| 870 | /* Set the object addresses and sizes in the structure pointed to by
|
|---|
| 871 | PMODULE, if possible. */
|
|---|
| 872 |
|
|---|
| 873 | static void find_module_layout (struct debuggee *d, struct ptn_module *pmodule)
|
|---|
| 874 | {
|
|---|
| 875 | ULONG addr_1, addr_2, addr_layout, flags;
|
|---|
| 876 | ULONG text_base, text_end, data_base, data_end, bss_base, bss_end;
|
|---|
| 877 | BYTE b;
|
|---|
| 878 |
|
|---|
| 879 | /* Get the address of the 1st object, which is supposed to be the
|
|---|
| 880 | .text object. */
|
|---|
| 881 |
|
|---|
| 882 | d->dbgbuf.Value = 1;
|
|---|
| 883 | d->dbgbuf.MTE = d->ptn_hmte;
|
|---|
| 884 | if (debug (d, DBG_C_NumToAddr) != 0)
|
|---|
| 885 | return;
|
|---|
| 886 | addr_1 = d->dbgbuf.Addr;
|
|---|
| 887 |
|
|---|
| 888 | /* Get the address of the 2nd object, which is supposed to be the
|
|---|
| 889 | .data object. */
|
|---|
| 890 |
|
|---|
| 891 | d->dbgbuf.Value = 2; /* 2nd object */
|
|---|
| 892 | d->dbgbuf.MTE = d->ptn_hmte;
|
|---|
| 893 | if (debug (d, DBG_C_NumToAddr) != 0)
|
|---|
| 894 | return;
|
|---|
| 895 | addr_2 = d->dbgbuf.Addr;
|
|---|
| 896 |
|
|---|
| 897 | /* Check that the .text object starts with the emx startup code.
|
|---|
| 898 | See also spawn_debug(), crt0.s, and dll0.s. */
|
|---|
| 899 |
|
|---|
| 900 | if (debug_read_8 (d, addr_1 + 0, &b) != 0
|
|---|
| 901 | || b != 0x68
|
|---|
| 902 | || debug_read_32 (d, addr_1 + 1, &addr_layout) != 0
|
|---|
| 903 | || addr_layout != addr_2
|
|---|
| 904 | || debug_read_8 (d, addr_1 + 5, &b) != 0
|
|---|
| 905 | || b != 0xe8
|
|---|
| 906 | || debug_read_8 (d, addr_1 + 10, &b) != 0
|
|---|
| 907 | || b != 0xeb
|
|---|
| 908 | || debug_read_8 (d, addr_1 + 12, &b) != 0
|
|---|
| 909 | || b != 0xe8)
|
|---|
| 910 | return;
|
|---|
| 911 |
|
|---|
| 912 | /* The module seems to be an emx executable or DLL. Read and check
|
|---|
| 913 | the layout table. */
|
|---|
| 914 |
|
|---|
| 915 | if (!READ_LAYOUT (flags, &flags)
|
|---|
| 916 | || (flags >> 24) < 2
|
|---|
| 917 | || !READ_LAYOUT (text_base, &text_base)
|
|---|
| 918 | || !READ_LAYOUT (text_end, &text_end)
|
|---|
| 919 | || text_base > text_end
|
|---|
| 920 | || !READ_LAYOUT (data_base, &data_base)
|
|---|
| 921 | || !READ_LAYOUT (data_end, &data_end)
|
|---|
| 922 | || data_base > data_end
|
|---|
| 923 | || !READ_LAYOUT (bss_base, &bss_base)
|
|---|
| 924 | || !READ_LAYOUT (bss_end, &bss_end)
|
|---|
| 925 | || bss_base > bss_end)
|
|---|
| 926 | return;
|
|---|
| 927 |
|
|---|
| 928 | /* Store the object addresses and sizes to the structure provided by
|
|---|
| 929 | the caller of ptrace(). */
|
|---|
| 930 |
|
|---|
| 931 | pmodule->text_start = text_base;
|
|---|
| 932 | pmodule->text_size = text_end - text_base;
|
|---|
| 933 | pmodule->data_start = data_base;
|
|---|
| 934 | pmodule->data_size = data_end - data_base;
|
|---|
| 935 | pmodule->bss_start = bss_base;
|
|---|
| 936 | pmodule->bss_size = bss_end - bss_base;
|
|---|
| 937 |
|
|---|
| 938 | /* Set PTNMOD_AOUT unless L_FLAG_LINK386 is set. */
|
|---|
| 939 |
|
|---|
| 940 | if (!(flags & L_FLAG_LINK386))
|
|---|
| 941 | pmodule->flags |= PTNMOD_AOUT;
|
|---|
| 942 | }
|
|---|
| 943 |
|
|---|
| 944 |
|
|---|
| 945 | /* Implement PTRACE_NOTIFICATION. */
|
|---|
| 946 |
|
|---|
| 947 | static int get_notification (struct debuggee *d, void *data, size_t size,
|
|---|
| 948 | ULONG *errnop)
|
|---|
| 949 | {
|
|---|
| 950 | struct ptn_thread *pthread;
|
|---|
| 951 | struct ptn_module *pmodule;
|
|---|
| 952 | struct ptn_proc *pproc;
|
|---|
| 953 | ULONG rc, flags;
|
|---|
| 954 |
|
|---|
| 955 | if (!d->ptn_flag)
|
|---|
| 956 | {
|
|---|
| 957 | *errnop = EINVAL;
|
|---|
| 958 | return -1;
|
|---|
| 959 | }
|
|---|
| 960 | switch (d->ptn)
|
|---|
| 961 | {
|
|---|
| 962 | case PTN_THREAD_NEW:
|
|---|
| 963 | case PTN_THREAD_END:
|
|---|
| 964 | if (data != NULL && size >= sizeof (struct ptn_thread))
|
|---|
| 965 | {
|
|---|
| 966 | pthread = data;
|
|---|
| 967 | pthread->tid = d->ptn_tid;
|
|---|
| 968 | }
|
|---|
| 969 | break;
|
|---|
| 970 |
|
|---|
| 971 | case PTN_MODULE_LOAD:
|
|---|
| 972 | case PTN_MODULE_FREE:
|
|---|
| 973 | if (data != NULL && size >= sizeof (struct ptn_module))
|
|---|
| 974 | {
|
|---|
| 975 | pmodule = data;
|
|---|
| 976 | pmodule->hmte = d->ptn_hmte;
|
|---|
| 977 | rc = DosQueryModuleName (d->ptn_hmte, sizeof (pmodule->name),
|
|---|
| 978 | pmodule->name);
|
|---|
| 979 | if (rc != 0)
|
|---|
| 980 | pmodule->name[0] = 0;
|
|---|
| 981 | pmodule->text_start = 0; pmodule->text_size = 0;
|
|---|
| 982 | pmodule->data_start = 0; pmodule->data_size = 0;
|
|---|
| 983 | pmodule->bss_start = 0; pmodule->bss_size = 0;
|
|---|
| 984 | pmodule->flags = 0;
|
|---|
| 985 | if (d->ptn == PTN_MODULE_LOAD)
|
|---|
| 986 | find_module_layout (d, pmodule);
|
|---|
| 987 | if (pmodule->name[0] != 0)
|
|---|
| 988 | {
|
|---|
| 989 | rc = DosQueryAppType (pmodule->name, &flags);
|
|---|
| 990 | if (rc == 0 && (flags & FAPPTYP_DLL))
|
|---|
| 991 | pmodule->flags |= PTNMOD_DLL;
|
|---|
| 992 | }
|
|---|
| 993 | }
|
|---|
| 994 | break;
|
|---|
| 995 |
|
|---|
| 996 | case PTN_PROC_NEW:
|
|---|
| 997 | if (data != NULL && size >= sizeof (struct ptn_proc))
|
|---|
| 998 | {
|
|---|
| 999 | pproc = data;
|
|---|
| 1000 | pproc->pid = d->ptn_pid;
|
|---|
| 1001 | pproc->fork_addr = d->ptn_fork_addr;
|
|---|
| 1002 | pproc->flags = d->ptn_flags;
|
|---|
| 1003 | memcpy (pproc->name, d->ptn_name, sizeof (pproc->name));
|
|---|
| 1004 | }
|
|---|
| 1005 | break;
|
|---|
| 1006 | }
|
|---|
| 1007 | *errnop = 0;
|
|---|
| 1008 | return d->ptn;
|
|---|
| 1009 | }
|
|---|
| 1010 |
|
|---|
| 1011 |
|
|---|
| 1012 | /* Handle PTRACE_THAW and PTRACE_FREEEZ. */
|
|---|
| 1013 |
|
|---|
| 1014 | static int thaw_freeze (struct debuggee *d, ULONG cmd, ULONG tid,
|
|---|
| 1015 | ULONG *errnop)
|
|---|
| 1016 | {
|
|---|
| 1017 | ULONG rc;
|
|---|
| 1018 |
|
|---|
| 1019 | if ((uflags & _UF_PTRACE_MODEL) != _UF_PTRACE_MULTITHREAD || tid == 0)
|
|---|
| 1020 | {
|
|---|
| 1021 | *errnop = EINVAL;
|
|---|
| 1022 | return -1;
|
|---|
| 1023 | }
|
|---|
| 1024 |
|
|---|
| 1025 | d->dbgbuf.Tid = tid;
|
|---|
| 1026 | rc = debug (d, cmd);
|
|---|
| 1027 | *errnop = rc;
|
|---|
| 1028 | return rc == 0 ? 0 : -1;
|
|---|
| 1029 | }
|
|---|
| 1030 |
|
|---|
| 1031 |
|
|---|
| 1032 | int do_ptrace (ULONG request, ULONG pid, ULONG addr, ULONG data, ULONG *errnop)
|
|---|
| 1033 | {
|
|---|
| 1034 | ULONG rc, w, tid;
|
|---|
| 1035 | const struct reg_table *rp;
|
|---|
| 1036 | struct debuggee *d;
|
|---|
| 1037 |
|
|---|
| 1038 | switch (request)
|
|---|
| 1039 | {
|
|---|
| 1040 | case PTRACE_ATTACH:
|
|---|
| 1041 | rc = do_attach (pid);
|
|---|
| 1042 | *errnop = rc;
|
|---|
| 1043 | return (rc == 0 ? 0 : -1);
|
|---|
| 1044 | }
|
|---|
| 1045 |
|
|---|
| 1046 | if ((uflags & _UF_PTRACE_MODEL) == _UF_PTRACE_MULTITHREAD)
|
|---|
| 1047 | {
|
|---|
| 1048 | tid = PTRACE_GETTID (pid);
|
|---|
| 1049 | pid = PTRACE_GETPID (pid);
|
|---|
| 1050 | }
|
|---|
| 1051 | else
|
|---|
| 1052 | tid = 1;
|
|---|
| 1053 |
|
|---|
| 1054 | if (pid == 0)
|
|---|
| 1055 | {
|
|---|
| 1056 | *errnop = ESRCH;
|
|---|
| 1057 | return -1;
|
|---|
| 1058 | }
|
|---|
| 1059 |
|
|---|
| 1060 | if (dbg_cache != NULL && dbg_cache->pid == pid)
|
|---|
| 1061 | d = dbg_cache;
|
|---|
| 1062 | else
|
|---|
| 1063 | {
|
|---|
| 1064 | for (d = dbg_head; d != NULL; d = d->next)
|
|---|
| 1065 | if (d->pid == pid)
|
|---|
| 1066 | break;
|
|---|
| 1067 | if (d == NULL)
|
|---|
| 1068 | {
|
|---|
| 1069 | *errnop = ESRCH;
|
|---|
| 1070 | return -1;
|
|---|
| 1071 | }
|
|---|
| 1072 | dbg_cache = d;
|
|---|
| 1073 | }
|
|---|
| 1074 | switch (request)
|
|---|
| 1075 | {
|
|---|
| 1076 | case PTRACE_EXIT:
|
|---|
| 1077 | d->regs_tid = 0; d->fpregs_ok = FALSE;
|
|---|
| 1078 | rc = terminate (d);
|
|---|
| 1079 | *errnop = rc;
|
|---|
| 1080 | if (rc != 0) return -1;
|
|---|
| 1081 | debug_set_wait (pid, 0, 0, TRUE);
|
|---|
| 1082 | return 0;
|
|---|
| 1083 |
|
|---|
| 1084 | case PTRACE_PEEKTEXT:
|
|---|
| 1085 | case PTRACE_PEEKDATA:
|
|---|
| 1086 | rc = debug_read_32 (d, addr, &w);
|
|---|
| 1087 | *errnop = rc;
|
|---|
| 1088 | if (rc != 0) return -1;
|
|---|
| 1089 | return w;
|
|---|
| 1090 |
|
|---|
| 1091 | case PTRACE_POKETEXT:
|
|---|
| 1092 | case PTRACE_POKEDATA:
|
|---|
| 1093 | rc = debug_poke16 (d, addr, (ULONG)data & 0xffff);
|
|---|
| 1094 | if (rc == 0)
|
|---|
| 1095 | rc = debug_poke16 (d, addr +2, (ULONG)data >> 16);
|
|---|
| 1096 | *errnop = rc;
|
|---|
| 1097 | return (rc == 0 ? 0 : -1);
|
|---|
| 1098 |
|
|---|
| 1099 | case PTRACE_PEEKUSER:
|
|---|
| 1100 | if (addr == USEROFF (u_ar0))
|
|---|
| 1101 | w = USEROFF (u_regs) + KERNEL_U_ADDR;
|
|---|
| 1102 | else if (addr == USEROFF (u_fpvalid))
|
|---|
| 1103 | {
|
|---|
| 1104 | if (!d->fpregs_ok)
|
|---|
| 1105 | get_fpstate (d);
|
|---|
| 1106 | w = (d->fpregs_ok ? 0xff : 0);
|
|---|
| 1107 | }
|
|---|
| 1108 | else if (addr == USEROFF (u_fpstate.status))
|
|---|
| 1109 | w = 0; /* ... */
|
|---|
| 1110 | else if (addr >= USEROFF (u_fpstate.state)
|
|---|
| 1111 | && addr <= USEROFF (u_fpstate.state) + sizeof (d->dbgco) - 4)
|
|---|
| 1112 | {
|
|---|
| 1113 | if (!d->fpregs_ok)
|
|---|
| 1114 | {
|
|---|
| 1115 | rc = get_fpstate (d);
|
|---|
| 1116 | if (rc != 0)
|
|---|
| 1117 | {
|
|---|
| 1118 | *errnop = rc;
|
|---|
| 1119 | return -1;
|
|---|
| 1120 | }
|
|---|
| 1121 | }
|
|---|
| 1122 | memcpy (&w, (char *)&d->dbgco + addr - USEROFF (u_fpstate.state), 4);
|
|---|
| 1123 | }
|
|---|
| 1124 | else if ((rp = user_addr (addr)) != NULL)
|
|---|
| 1125 | {
|
|---|
| 1126 | rc = read_reg (d, tid);
|
|---|
| 1127 | if (rc != 0)
|
|---|
| 1128 | {
|
|---|
| 1129 | *errnop = rc;
|
|---|
| 1130 | return -1;
|
|---|
| 1131 | }
|
|---|
| 1132 | w = 0;
|
|---|
| 1133 | memcpy (&w, &d->regs[rp->reg], rp->len);
|
|---|
| 1134 | }
|
|---|
| 1135 | else
|
|---|
| 1136 | {
|
|---|
| 1137 | *errnop = EINVAL;
|
|---|
| 1138 | return -1;
|
|---|
| 1139 | }
|
|---|
| 1140 | *errnop = 0;
|
|---|
| 1141 | return w;
|
|---|
| 1142 |
|
|---|
| 1143 | case PTRACE_POKEUSER:
|
|---|
| 1144 | rp = user_addr (addr);
|
|---|
| 1145 | if (rp == NULL)
|
|---|
| 1146 | rc = EIO;
|
|---|
| 1147 | else
|
|---|
| 1148 | rc = read_reg (d, tid);
|
|---|
| 1149 | if (rc == 0)
|
|---|
| 1150 | {
|
|---|
| 1151 | d->regs[rp->reg] = 0;
|
|---|
| 1152 | memcpy (&d->regs[rp->reg], &data, rp->len);
|
|---|
| 1153 | d->regs_changed = TRUE;
|
|---|
| 1154 | }
|
|---|
| 1155 | *errnop = rc;
|
|---|
| 1156 | return (rc == 0 ? 0 : -1);
|
|---|
| 1157 |
|
|---|
| 1158 | case PTRACE_RESUME:
|
|---|
| 1159 | rc = run (d, DBG_C_Go, 0, data, tid);
|
|---|
| 1160 | *errnop = rc;
|
|---|
| 1161 | return (rc == 0 ? 0 : -1);
|
|---|
| 1162 |
|
|---|
| 1163 | case PTRACE_STEP:
|
|---|
| 1164 | /* Avoid stepping into emx_syscall. */
|
|---|
| 1165 | if (d->syscall_addr != 0 && d->syscall_addr == d->regs[R_EIP])
|
|---|
| 1166 | rc = run (d, DBG_C_Go, d->syscall_addr + 5, data, tid);
|
|---|
| 1167 | else
|
|---|
| 1168 | rc = run (d, DBG_C_SStep, 0, data, tid);
|
|---|
| 1169 | *errnop = rc;
|
|---|
| 1170 | return (rc == 0 ? 0 : -1);
|
|---|
| 1171 |
|
|---|
| 1172 | case PTRACE_SESSION:
|
|---|
| 1173 | if (!debug_same_sess)
|
|---|
| 1174 | switch (data)
|
|---|
| 1175 | {
|
|---|
| 1176 | case 0: /* Switch to debugger */
|
|---|
| 1177 | DosSelectSession (0);
|
|---|
| 1178 | d->auto_switch = FALSE;
|
|---|
| 1179 | break;
|
|---|
| 1180 |
|
|---|
| 1181 | case 1: /* Switch to child */
|
|---|
| 1182 | DosSelectSession (d->sid);
|
|---|
| 1183 | d->auto_switch = FALSE;
|
|---|
| 1184 | break;
|
|---|
| 1185 |
|
|---|
| 1186 | case 2: /* Automatic switch to child */
|
|---|
| 1187 | d->auto_switch = TRUE;
|
|---|
| 1188 | break;
|
|---|
| 1189 |
|
|---|
| 1190 | default:
|
|---|
| 1191 | /* Succeed for undefined values. */
|
|---|
| 1192 | break;
|
|---|
| 1193 | }
|
|---|
| 1194 | *errnop = 0;
|
|---|
| 1195 | return 0;
|
|---|
| 1196 |
|
|---|
| 1197 | case PTRACE_NOTIFICATION:
|
|---|
| 1198 | return get_notification (d, (void *)addr, (size_t)data, errnop);
|
|---|
| 1199 |
|
|---|
| 1200 | case PTRACE_CONT:
|
|---|
| 1201 | if (!d->ptn_flag)
|
|---|
| 1202 | {
|
|---|
| 1203 | *errnop = EINVAL;
|
|---|
| 1204 | return -1;
|
|---|
| 1205 | }
|
|---|
| 1206 | rc = run (d, d->n_cmd, d->n_tbreak, d->n_signo, d->n_tid);
|
|---|
| 1207 | *errnop = rc;
|
|---|
| 1208 | return (rc == 0 ? 0 : -1);
|
|---|
| 1209 |
|
|---|
| 1210 | case PTRACE_THAW:
|
|---|
| 1211 | return thaw_freeze (d, DBG_C_Resume, tid, errnop);
|
|---|
| 1212 |
|
|---|
| 1213 | case PTRACE_FREEZE:
|
|---|
| 1214 | return thaw_freeze (d, DBG_C_Freeze, tid, errnop);
|
|---|
| 1215 |
|
|---|
| 1216 | case PTRACE_DETACH:
|
|---|
| 1217 | rc = do_detach (d, addr);
|
|---|
| 1218 | *errnop = rc;
|
|---|
| 1219 | return (rc == 0 ? 0 : -1);
|
|---|
| 1220 |
|
|---|
| 1221 | case PTRACE_TRACEME:
|
|---|
| 1222 | default:
|
|---|
| 1223 | *errnop = EINVAL;
|
|---|
| 1224 | return -1;
|
|---|
| 1225 | }
|
|---|
| 1226 | }
|
|---|
| 1227 |
|
|---|
| 1228 |
|
|---|
| 1229 | static ULONG free_debuggee (struct debuggee *d, ULONG return_value)
|
|---|
| 1230 | {
|
|---|
| 1231 | struct debuggee **pd;
|
|---|
| 1232 |
|
|---|
| 1233 | if (d->resources & (DR_SERVER_HEV_SERVER | DR_CLIENT_HEV_SERVER))
|
|---|
| 1234 | DosCloseEventSem (d->hev_server);
|
|---|
| 1235 | if (d->resources & (DR_SERVER_HEV_CLIENT | DR_CLIENT_HEV_CLIENT))
|
|---|
| 1236 | DosCloseEventSem (d->hev_client);
|
|---|
| 1237 |
|
|---|
| 1238 | if (d->resources & DR_LIST)
|
|---|
| 1239 | {
|
|---|
| 1240 | for (pd = &dbg_head; *pd != NULL; pd = &(*pd)->next)
|
|---|
| 1241 | if (*pd == d)
|
|---|
| 1242 | {
|
|---|
| 1243 | *pd = d->next;
|
|---|
| 1244 | break;
|
|---|
| 1245 | }
|
|---|
| 1246 | if (dbg_cache == d)
|
|---|
| 1247 | dbg_cache = NULL;
|
|---|
| 1248 | }
|
|---|
| 1249 |
|
|---|
| 1250 | DosFreeMem (d);
|
|---|
| 1251 | return return_value;
|
|---|
| 1252 | }
|
|---|
| 1253 |
|
|---|
| 1254 |
|
|---|
| 1255 | /* Return errno. */
|
|---|
| 1256 |
|
|---|
| 1257 | static ULONG new_debuggee (struct debuggee **pd, ULONG pid, ULONG sid,
|
|---|
| 1258 | enum dbg_type type)
|
|---|
| 1259 | {
|
|---|
| 1260 | ULONG rc, w;
|
|---|
| 1261 | BYTE b;
|
|---|
| 1262 | struct debuggee *d;
|
|---|
| 1263 | void *mem;
|
|---|
| 1264 |
|
|---|
| 1265 | if (type == DT_CLIENT || type == DT_SERVER)
|
|---|
| 1266 | d = *pd;
|
|---|
| 1267 | else
|
|---|
| 1268 | {
|
|---|
| 1269 | rc = DosAllocMem (&mem, sizeof (*d), PAG_COMMIT | PAG_READ | PAG_WRITE);
|
|---|
| 1270 | if (rc != 0) return set_error (rc);
|
|---|
| 1271 | d = (struct debuggee *)mem;
|
|---|
| 1272 | d->resources = 0;
|
|---|
| 1273 | }
|
|---|
| 1274 |
|
|---|
| 1275 | d->next = NULL;
|
|---|
| 1276 | d->type = type;
|
|---|
| 1277 | d->syscall_addr = 0;
|
|---|
| 1278 | d->layout_addr = 0;
|
|---|
| 1279 | d->fpregs_ok = FALSE;
|
|---|
| 1280 | d->regs_tid = 0;
|
|---|
| 1281 | d->regs_changed = FALSE;
|
|---|
| 1282 | d->context = 0;
|
|---|
| 1283 | d->signo = 0;
|
|---|
| 1284 | d->ptn = PTN_NONE;
|
|---|
| 1285 | d->ptn_flag = FALSE;
|
|---|
| 1286 |
|
|---|
| 1287 | if (type == DT_CLIENT)
|
|---|
| 1288 | {
|
|---|
| 1289 | rc = call_server (d, REQ_ATTACH);
|
|---|
| 1290 | if (rc != 0)
|
|---|
| 1291 | return free_debuggee (d, set_error (rc));
|
|---|
| 1292 | if (d->server_rc != 0)
|
|---|
| 1293 | return free_debuggee (d, d->server_rc);
|
|---|
| 1294 | }
|
|---|
| 1295 |
|
|---|
| 1296 | if (type == DT_LOCAL || type == DT_SERVER)
|
|---|
| 1297 | {
|
|---|
| 1298 | d->pid = pid;
|
|---|
| 1299 | d->sid = sid;
|
|---|
| 1300 |
|
|---|
| 1301 | d->dbgbuf.Tid = 0; /* reserved */
|
|---|
| 1302 | d->dbgbuf.Value = DBG_L_386; /* level */
|
|---|
| 1303 | rc = debug (d, DBG_C_Connect);
|
|---|
| 1304 | if (rc != 0)
|
|---|
| 1305 | return free_debuggee (d, rc);
|
|---|
| 1306 | if (d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 1307 | return free_debuggee (d, EINVAL);
|
|---|
| 1308 | d->dbgbuf.Tid = 0; /* Active thread */
|
|---|
| 1309 | rc = debug (d, DBG_C_ReadReg);
|
|---|
| 1310 | if (rc != 0)
|
|---|
| 1311 | return free_debuggee (d, rc);
|
|---|
| 1312 | if (d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 1313 | return free_debuggee (d, EINVAL);
|
|---|
| 1314 | }
|
|---|
| 1315 | if (debug_read_8 (d, ENTRY_POINT+0, &b) == 0 && b == 0x68 /* PUSH n */
|
|---|
| 1316 | && debug_read_8 (d, ENTRY_POINT+5, &b) == 0 && b == 0xe8 /* CALL */
|
|---|
| 1317 | && debug_read_8 (d, ENTRY_POINT+10, &b) == 0 && b == 0xeb /* JMP */
|
|---|
| 1318 | && debug_read_8 (d, ENTRY_POINT+12, &b) == 0 && b == 0xe8 /* CALL */
|
|---|
| 1319 | && debug_read_32 (d, ENTRY_POINT+1, &w) == 0)
|
|---|
| 1320 | {
|
|---|
| 1321 | d->layout_addr = w;
|
|---|
| 1322 | d->syscall_addr = ENTRY_POINT + 12;
|
|---|
| 1323 | }
|
|---|
| 1324 |
|
|---|
| 1325 | if (pd != NULL)
|
|---|
| 1326 | *pd = d;
|
|---|
| 1327 |
|
|---|
| 1328 | if (type == DT_LOCAL || type == DT_CLIENT)
|
|---|
| 1329 | {
|
|---|
| 1330 | d->next = dbg_head;
|
|---|
| 1331 | dbg_head = d;
|
|---|
| 1332 | d->resources |= DR_LIST;
|
|---|
| 1333 | }
|
|---|
| 1334 | return 0;
|
|---|
| 1335 | }
|
|---|
| 1336 |
|
|---|
| 1337 |
|
|---|
| 1338 | /* Prepare a child process for debugging. Return errno. */
|
|---|
| 1339 |
|
|---|
| 1340 | ULONG spawn_debug (ULONG pid, ULONG sid)
|
|---|
| 1341 | {
|
|---|
| 1342 | return new_debuggee (NULL, pid, sid, DT_LOCAL);
|
|---|
| 1343 | }
|
|---|
| 1344 |
|
|---|
| 1345 |
|
|---|
| 1346 | /* Detach from a child process, that is, let it run to the end. */
|
|---|
| 1347 |
|
|---|
| 1348 | static void handle_detach (struct debuggee *d)
|
|---|
| 1349 | {
|
|---|
| 1350 | ULONG rc;
|
|---|
| 1351 | enum {GO, END, NOTIFICATION} state;
|
|---|
| 1352 |
|
|---|
| 1353 | /* Thaw all threads. */
|
|---|
| 1354 |
|
|---|
| 1355 | d->dbgbuf.Cmd = DBG_C_Resume;
|
|---|
| 1356 | d->dbgbuf.Pid = d->pid;
|
|---|
| 1357 | d->dbgbuf.Tid = 0; /* All threads */
|
|---|
| 1358 | rc = DosDebug (&d->dbgbuf);
|
|---|
| 1359 |
|
|---|
| 1360 | state = GO;
|
|---|
| 1361 | do
|
|---|
| 1362 | {
|
|---|
| 1363 | if (state == GO)
|
|---|
| 1364 | {
|
|---|
| 1365 | d->dbgbuf.Cmd = DBG_C_Go;
|
|---|
| 1366 | d->dbgbuf.Pid = d->pid;
|
|---|
| 1367 | rc = DosDebug (&d->dbgbuf);
|
|---|
| 1368 | if (rc != 0) break;
|
|---|
| 1369 | }
|
|---|
| 1370 |
|
|---|
| 1371 | switch (d->dbgbuf.Cmd)
|
|---|
| 1372 | {
|
|---|
| 1373 | case DBG_N_Error:
|
|---|
| 1374 | state = END;
|
|---|
| 1375 | break;
|
|---|
| 1376 |
|
|---|
| 1377 | case DBG_N_Exception:
|
|---|
| 1378 | d->dbgbuf.Cmd = DBG_C_ReadReg;
|
|---|
| 1379 | d->dbgbuf.Pid = d->pid;
|
|---|
| 1380 | d->dbgbuf.Tid = 0;
|
|---|
| 1381 | rc = DosDebug (&d->dbgbuf);
|
|---|
| 1382 | if (rc != 0 || d->dbgbuf.Cmd != DBG_N_Success)
|
|---|
| 1383 | d->dbgbuf.Tid = 1;
|
|---|
| 1384 |
|
|---|
| 1385 | d->dbgbuf.Cmd = DBG_C_Continue;
|
|---|
| 1386 | d->dbgbuf.Value = XCPT_CONTINUE_SEARCH;
|
|---|
| 1387 | d->dbgbuf.Pid = d->pid;
|
|---|
| 1388 | rc = DosDebug (&d->dbgbuf);
|
|---|
| 1389 | state = rc == 0 ? NOTIFICATION : END;
|
|---|
| 1390 | break;
|
|---|
| 1391 |
|
|---|
| 1392 | case DBG_N_ProcTerm:
|
|---|
| 1393 | d->dbgbuf.Cmd = DBG_C_Go;
|
|---|
| 1394 | d->dbgbuf.Pid = d->pid;
|
|---|
| 1395 | rc = DosDebug (&d->dbgbuf);
|
|---|
| 1396 | state = END;
|
|---|
| 1397 | break;
|
|---|
| 1398 |
|
|---|
| 1399 | default:
|
|---|
| 1400 | state = GO;
|
|---|
| 1401 | break;
|
|---|
| 1402 | }
|
|---|
| 1403 | } while (state != END);
|
|---|
| 1404 |
|
|---|
| 1405 | free_debuggee (d, 0);
|
|---|
| 1406 | DosExit (EXIT_THREAD, 0);
|
|---|
| 1407 | }
|
|---|
| 1408 |
|
|---|
| 1409 |
|
|---|
| 1410 |
|
|---|
| 1411 | static void server_answer (struct debuggee *d)
|
|---|
| 1412 | {
|
|---|
| 1413 | ULONG rc;
|
|---|
| 1414 |
|
|---|
| 1415 | rc = DosPostEventSem (d->hev_client);
|
|---|
| 1416 | if (rc != 0)
|
|---|
| 1417 | {
|
|---|
| 1418 | oprintf ("server_answer: DosPostEventSem failed, rc=%u\r\n", rc);
|
|---|
| 1419 | DosExit (EXIT_THREAD, 2);
|
|---|
| 1420 | }
|
|---|
| 1421 | }
|
|---|
| 1422 |
|
|---|
| 1423 |
|
|---|
| 1424 | /* Handle DosDebug requests from a debugger which attached to a child
|
|---|
| 1425 | process of one of our debuggees. */
|
|---|
| 1426 |
|
|---|
| 1427 | static void debug_descendant_thread (ULONG arg)
|
|---|
| 1428 | {
|
|---|
| 1429 | struct debuggee *d;
|
|---|
| 1430 | ULONG rc, post_count, clients;
|
|---|
| 1431 |
|
|---|
| 1432 | /* Raise our priority. */
|
|---|
| 1433 |
|
|---|
| 1434 | rc = DosSetPriority (PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0);
|
|---|
| 1435 |
|
|---|
| 1436 | d = (struct debuggee *)arg;
|
|---|
| 1437 | clients = 0;
|
|---|
| 1438 |
|
|---|
| 1439 | /* Handle requests. */
|
|---|
| 1440 |
|
|---|
| 1441 | for (;;)
|
|---|
| 1442 | {
|
|---|
| 1443 | rc = DosWaitEventSem (d->hev_server, SEM_INDEFINITE_WAIT);
|
|---|
| 1444 | if (rc != 0)
|
|---|
| 1445 | {
|
|---|
| 1446 | oprintf ("debug_descendant_thread: DosWaitEventSem failed, "
|
|---|
| 1447 | "rc=%u\r\n", rc);
|
|---|
| 1448 | return;
|
|---|
| 1449 | }
|
|---|
| 1450 |
|
|---|
| 1451 | rc = DosResetEventSem (d->hev_server, &post_count);
|
|---|
| 1452 |
|
|---|
| 1453 | switch (d->server_request)
|
|---|
| 1454 | {
|
|---|
| 1455 | case REQ_ATTACH:
|
|---|
| 1456 | if (clients == 0)
|
|---|
| 1457 | {
|
|---|
| 1458 | ++clients;
|
|---|
| 1459 | d->server_rc = 0;
|
|---|
| 1460 | }
|
|---|
| 1461 | else
|
|---|
| 1462 | d->server_rc = EACCES;
|
|---|
| 1463 | server_answer (d);
|
|---|
| 1464 | break;
|
|---|
| 1465 |
|
|---|
| 1466 | case REQ_DOSDEBUG:
|
|---|
| 1467 | d->server_rc = DosDebug (&d->dbgbuf);
|
|---|
| 1468 | server_answer (d);
|
|---|
| 1469 | break;
|
|---|
| 1470 |
|
|---|
| 1471 | case REQ_DETACH:
|
|---|
| 1472 | d->server_rc = 0; /* errno*/
|
|---|
| 1473 | server_answer (d);
|
|---|
| 1474 | --clients;
|
|---|
| 1475 | if (d->server_arg == 1)
|
|---|
| 1476 | handle_detach (d);
|
|---|
| 1477 | break;
|
|---|
| 1478 |
|
|---|
| 1479 | default:
|
|---|
| 1480 | oprintf ("debug_descendant_thread: invalid request %u\r\n",
|
|---|
| 1481 | d->server_request);
|
|---|
| 1482 | break;
|
|---|
| 1483 | }
|
|---|
| 1484 | }
|
|---|
| 1485 | }
|
|---|
| 1486 |
|
|---|
| 1487 |
|
|---|
| 1488 | /* The debuggee PARENT got a new child process. Enable debugging of
|
|---|
| 1489 | the child process for PTRACE_ATTACH. Return errno or N_NOTIFY. */
|
|---|
| 1490 |
|
|---|
| 1491 | static ULONG start_debug_descendant (struct debuggee *parent)
|
|---|
| 1492 | {
|
|---|
| 1493 | char mname[64];
|
|---|
| 1494 | struct debuggee *child;
|
|---|
| 1495 | void *mem;
|
|---|
| 1496 | TID tid;
|
|---|
| 1497 | ULONG rc;
|
|---|
| 1498 |
|
|---|
| 1499 | sprintf (mname, SHAREMEM_FMT, (unsigned)parent->ptn_pid);
|
|---|
| 1500 | rc = DosAllocSharedMem (&mem, mname, sizeof (*child),
|
|---|
| 1501 | PAG_COMMIT | PAG_READ | PAG_WRITE);
|
|---|
| 1502 | if (rc != 0) return set_error (rc);
|
|---|
| 1503 | child = (struct debuggee *)mem;
|
|---|
| 1504 | child->resources = 0;
|
|---|
| 1505 |
|
|---|
| 1506 | rc = DosCreateEventSem (NULL, &child->hev_server, DC_SEM_SHARED, FALSE);
|
|---|
| 1507 | if (rc == 0)
|
|---|
| 1508 | {
|
|---|
| 1509 | child->resources |= DR_SERVER_HEV_SERVER;
|
|---|
| 1510 | rc = DosCreateEventSem (NULL, &child->hev_client, DC_SEM_SHARED, FALSE);
|
|---|
| 1511 | if (rc == 0)
|
|---|
| 1512 | {
|
|---|
| 1513 | child->resources |= DR_SERVER_HEV_CLIENT;
|
|---|
| 1514 |
|
|---|
| 1515 | /* We don't have a session ID. TODO: qwait_thread() may
|
|---|
| 1516 | provide the session ID sooner or later. */
|
|---|
| 1517 |
|
|---|
| 1518 | rc = new_debuggee (&child, parent->ptn_pid, 0, DT_SERVER);
|
|---|
| 1519 |
|
|---|
| 1520 | /* More initializations. */
|
|---|
| 1521 |
|
|---|
| 1522 | if (rc == 0)
|
|---|
| 1523 | rc = start_debug_descendant_2 (parent, child);
|
|---|
| 1524 |
|
|---|
| 1525 | /* Create a thread which will handle debugging of the new
|
|---|
| 1526 | child process. */
|
|---|
| 1527 |
|
|---|
| 1528 | if (rc == 0)
|
|---|
| 1529 | rc = DosCreateThread (&tid, debug_descendant_thread, (ULONG)child,
|
|---|
| 1530 | CREATE_READY | STACK_COMMITTED, 0x4000);
|
|---|
| 1531 | }
|
|---|
| 1532 | }
|
|---|
| 1533 | if (rc != 0)
|
|---|
| 1534 | return free_debuggee (child, set_error (rc));
|
|---|
| 1535 |
|
|---|
| 1536 | return N_NOTIFY;
|
|---|
| 1537 | }
|
|---|
| 1538 |
|
|---|
| 1539 |
|
|---|
| 1540 | /* Subroutine of the above. Return OS/2 error code. */
|
|---|
| 1541 |
|
|---|
| 1542 | static ULONG start_debug_descendant_2 (struct debuggee *parent,
|
|---|
| 1543 | struct debuggee *child)
|
|---|
| 1544 | {
|
|---|
| 1545 | ULONG rc, flags, w;
|
|---|
| 1546 | BYTE b;
|
|---|
| 1547 |
|
|---|
| 1548 | /* For now assume that the child is in the same session as its
|
|---|
| 1549 | parent. (The condition is always true.) That doesn't hurt
|
|---|
| 1550 | because we can't switch sessions anyway (either we'll get error
|
|---|
| 1551 | ERROR_SMG_SESSION_NOT_PARENT or ERROR_SMG_SESSION_NOT_FOREGRND,
|
|---|
| 1552 | depending on whether the client or server attempts to select the
|
|---|
| 1553 | session). */
|
|---|
| 1554 |
|
|---|
| 1555 | if (child->sid == 0)
|
|---|
| 1556 | child->sid = parent->sid;
|
|---|
| 1557 |
|
|---|
| 1558 | /* Get module name of the child process. */
|
|---|
| 1559 |
|
|---|
| 1560 | child->dbgbuf.Tid = 0; /* Current thread */
|
|---|
| 1561 | rc = debug (child, DBG_C_ReadReg);
|
|---|
| 1562 | if (rc == 0 && child->dbgbuf.Cmd == DBG_N_Success)
|
|---|
| 1563 | {
|
|---|
| 1564 | rc = DosQueryModuleName (child->dbgbuf.MTE, sizeof (parent->ptn_name),
|
|---|
| 1565 | parent->ptn_name);
|
|---|
| 1566 | if (rc != 0)
|
|---|
| 1567 | parent->ptn_name[0] = 0;
|
|---|
| 1568 | }
|
|---|
| 1569 |
|
|---|
| 1570 | /* Find out whether the child process uses a.out format. */
|
|---|
| 1571 |
|
|---|
| 1572 | if (child->layout_addr != 0
|
|---|
| 1573 | && debug_read_32 (child, (child->layout_addr
|
|---|
| 1574 | + offsetof (layout_table, flags)),
|
|---|
| 1575 | &flags) == 0
|
|---|
| 1576 | && !(flags & L_FLAG_LINK386))
|
|---|
| 1577 | parent->ptn_flags |= PTNPROC_AOUT;
|
|---|
| 1578 |
|
|---|
| 1579 | /* Find out whether the child process has been forked. */
|
|---|
| 1580 |
|
|---|
| 1581 | if (debug_read_8 (parent, (ULONG)&ptrace_forking, &b) == 0 && b)
|
|---|
| 1582 | {
|
|---|
| 1583 | parent->ptn_flags |= PTNPROC_FORK;
|
|---|
| 1584 | if (debug_read_32 (parent, (ULONG)&ptrace_fork_addr, &w) == 0)
|
|---|
| 1585 | parent->ptn_fork_addr = w;
|
|---|
| 1586 | }
|
|---|
| 1587 |
|
|---|
| 1588 | return 0;
|
|---|
| 1589 | }
|
|---|
| 1590 |
|
|---|
| 1591 |
|
|---|
| 1592 | /* Return OS/2 error code. */
|
|---|
| 1593 |
|
|---|
| 1594 | static ULONG call_server (struct debuggee *d, ULONG request)
|
|---|
| 1595 | {
|
|---|
| 1596 | ULONG rc, count;
|
|---|
| 1597 |
|
|---|
| 1598 | rc = DosResetEventSem (d->hev_client, &count);
|
|---|
| 1599 | if (rc != 0 && rc != ERROR_ALREADY_RESET)
|
|---|
| 1600 | return rc;
|
|---|
| 1601 |
|
|---|
| 1602 | d->server_request = request;
|
|---|
| 1603 | rc = DosPostEventSem (d->hev_server);
|
|---|
| 1604 | if (rc != 0) return rc;
|
|---|
| 1605 |
|
|---|
| 1606 | rc = DosWaitEventSem (d->hev_client, SEM_INDEFINITE_WAIT);
|
|---|
| 1607 | if (rc != 0) return rc;
|
|---|
| 1608 | return 0;
|
|---|
| 1609 | }
|
|---|
| 1610 |
|
|---|
| 1611 |
|
|---|
| 1612 | /* Return errno. */
|
|---|
| 1613 |
|
|---|
| 1614 | static ULONG new_client (struct debuggee **pd, ULONG pid)
|
|---|
| 1615 | {
|
|---|
| 1616 | char mname[64];
|
|---|
| 1617 | ULONG rc;
|
|---|
| 1618 | void *mem;
|
|---|
| 1619 | struct debuggee *d;
|
|---|
| 1620 |
|
|---|
| 1621 | sprintf (mname, SHAREMEM_FMT, (unsigned)pid);
|
|---|
| 1622 | rc = DosGetNamedSharedMem (&mem, mname, PAG_READ | PAG_WRITE);
|
|---|
| 1623 | if (rc != 0)
|
|---|
| 1624 | return ESRCH;
|
|---|
| 1625 |
|
|---|
| 1626 | d = (struct debuggee *)mem;
|
|---|
| 1627 |
|
|---|
| 1628 | /* Assume that at most one process at a time connects to the server
|
|---|
| 1629 | for each PID. */
|
|---|
| 1630 |
|
|---|
| 1631 | d->resources &= ~(DR_CLIENT_HEV_CLIENT | DR_CLIENT_HEV_SERVER);
|
|---|
| 1632 |
|
|---|
| 1633 | rc = DosOpenEventSem (NULL, &d->hev_server);
|
|---|
| 1634 | if (rc == 0)
|
|---|
| 1635 | {
|
|---|
| 1636 | d->resources |= DR_CLIENT_HEV_SERVER;
|
|---|
| 1637 | rc = DosOpenEventSem (NULL, &d->hev_client);
|
|---|
| 1638 | if (rc == 0)
|
|---|
| 1639 | d->resources |= DR_CLIENT_HEV_CLIENT;
|
|---|
| 1640 | }
|
|---|
| 1641 | if (rc != 0)
|
|---|
| 1642 | return free_debuggee (d, set_error (rc));
|
|---|
| 1643 | *pd = d;
|
|---|
| 1644 | return 0;
|
|---|
| 1645 | }
|
|---|
| 1646 |
|
|---|
| 1647 |
|
|---|
| 1648 | /* Handle PTRACE_ATTACH. Return errno. */
|
|---|
| 1649 |
|
|---|
| 1650 | static ULONG do_attach (ULONG pid)
|
|---|
| 1651 | {
|
|---|
| 1652 | struct debuggee *d;
|
|---|
| 1653 | ULONG rc;
|
|---|
| 1654 |
|
|---|
| 1655 | rc = proc_add_attach (pid);
|
|---|
| 1656 | if (rc != 0) return rc;
|
|---|
| 1657 |
|
|---|
| 1658 | rc = new_client (&d, pid);
|
|---|
| 1659 | if (rc == 0)
|
|---|
| 1660 | {
|
|---|
| 1661 | rc = new_debuggee (&d, pid, 0, DT_CLIENT);
|
|---|
| 1662 | if (rc == 0)
|
|---|
| 1663 | debug_set_wait (d->pid, 0, 0x7f | (SIGTRAP << 8), FALSE);
|
|---|
| 1664 | if (rc != 0)
|
|---|
| 1665 | free_debuggee (d, 0);
|
|---|
| 1666 | }
|
|---|
| 1667 | if (rc != 0)
|
|---|
| 1668 | proc_remove_attach (pid);
|
|---|
| 1669 | return rc;
|
|---|
| 1670 | }
|
|---|
| 1671 |
|
|---|
| 1672 |
|
|---|
| 1673 | /* Handle PTRACE_DETACH. Return errno. */
|
|---|
| 1674 |
|
|---|
| 1675 | static ULONG do_detach (struct debuggee *d, ULONG addr)
|
|---|
| 1676 | {
|
|---|
| 1677 | ULONG rc;
|
|---|
| 1678 |
|
|---|
| 1679 | if (d->type != DT_CLIENT)
|
|---|
| 1680 | return EINVAL;
|
|---|
| 1681 | if (addr != 0 && addr != 1)
|
|---|
| 1682 | return EINVAL;
|
|---|
| 1683 | d->server_arg = addr;
|
|---|
| 1684 | rc = call_server (d, REQ_DETACH);
|
|---|
| 1685 | if (rc != 0)
|
|---|
| 1686 | return set_error (rc);
|
|---|
| 1687 | else
|
|---|
| 1688 | return free_debuggee (d, d->server_rc);
|
|---|
| 1689 | }
|
|---|
