| 1 | /* Assembler macros for i386.
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| 2 | Copyright (C) 1991-93,95,96,98,2002,2003,2005 Free Software Foundation, Inc.
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| 3 | This file is part of the GNU C Library.
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| 4 |
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| 5 | The GNU C Library is free software; you can redistribute it and/or
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| 6 | modify it under the terms of the GNU Lesser General Public
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| 7 | License as published by the Free Software Foundation; either
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| 8 | version 2.1 of the License, or (at your option) any later version.
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| 9 |
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| 10 | The GNU C Library is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | Lesser General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Lesser General Public
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| 16 | License along with the GNU C Library; if not, write to the Free
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| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 18 | 02111-1307 USA. */
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| 19 |
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| 20 | #include <sysdeps/generic/sysdep.h>
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| 21 |
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| 22 | #ifdef __ASSEMBLER__
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| 23 |
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| 24 | /* Syntactic details of assembler. */
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| 25 |
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| 26 | #ifdef HAVE_ELF
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| 27 |
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| 28 | /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */
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| 29 | #define ALIGNARG(log2) 1<<log2
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| 30 | /* For ELF we need the `.type' directive to make shared libs work right. */
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| 31 | #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
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| 32 | #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
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| 33 |
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| 34 | /* In ELF C symbols are asm symbols. */
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| 35 | #undef NO_UNDERSCORES
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| 36 | #define NO_UNDERSCORES
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| 37 |
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| 38 | #else
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| 39 |
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| 40 | #define ALIGNARG(log2) log2
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| 41 | #define ASM_TYPE_DIRECTIVE(name,type) /* Nothing is specified. */
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| 42 | #define ASM_SIZE_DIRECTIVE(name) /* Nothing is specified. */
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| 43 |
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| 44 | #endif
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| 45 |
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| 46 |
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| 47 | /* Define an entry point visible from C.
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| 48 |
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| 49 | There is currently a bug in gdb which prevents us from specifying
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| 50 | incomplete stabs information. Fake some entries here which specify
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| 51 | the current source file. */
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| 52 | #define ENTRY(name) \
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| 53 | STABS_CURRENT_FILE1("") \
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| 54 | STABS_CURRENT_FILE(name) \
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| 55 | ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \
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| 56 | ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \
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| 57 | .align ALIGNARG(4); \
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| 58 | STABS_FUN(name) \
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| 59 | C_LABEL(name) \
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| 60 | cfi_startproc; \
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| 61 | CALL_MCOUNT
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| 62 |
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| 63 | #undef END
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| 64 | #define END(name) \
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| 65 | cfi_endproc; \
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| 66 | ASM_SIZE_DIRECTIVE(name) \
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| 67 | STABS_FUN_END(name)
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| 68 |
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| 69 | #ifdef HAVE_CPP_ASM_DEBUGINFO
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| 70 | /* Disable that goop, because we just pass -g through to the assembler
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| 71 | and it generates proper line number information directly. */
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| 72 | # define STABS_CURRENT_FILE1(name)
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| 73 | # define STABS_CURRENT_FILE(name)
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| 74 | # define STABS_FUN(name)
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| 75 | # define STABS_FUN_END(name)
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| 76 | #else
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| 77 | /* Remove the following two lines once the gdb bug is fixed. */
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| 78 | #define STABS_CURRENT_FILE(name) \
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| 79 | STABS_CURRENT_FILE1 (#name)
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| 80 | #define STABS_CURRENT_FILE1(name) \
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| 81 | 1: .stabs name,100,0,0,1b;
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| 82 | /* Emit stabs definition lines. We use F(0,1) and define t(0,1) as `int',
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| 83 | the same way gcc does it. */
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| 84 | #define STABS_FUN(name) STABS_FUN2(name, name##:F(0,1))
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| 85 | #define STABS_FUN2(name, namestr) \
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| 86 | .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0; \
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| 87 | .stabs #namestr,36,0,0,name;
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| 88 | #define STABS_FUN_END(name) \
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| 89 | 1: .stabs "",36,0,0,1b-name;
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| 90 | #endif
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| 91 |
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| 92 | /* If compiled for profiling, call `mcount' at the start of each function. */
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| 93 | #ifdef PROF
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| 94 | /* The mcount code relies on a normal frame pointer being on the stack
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| 95 | to locate our caller, so push one just for its benefit. */
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| 96 | #define CALL_MCOUNT \
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| 97 | pushl %ebp; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \
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| 98 | cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \
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| 99 | popl %ebp; cfi_def_cfa (esp, 4);
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| 100 | #else
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| 101 | #define CALL_MCOUNT /* Do nothing. */
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| 102 | #endif
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| 103 |
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| 104 | #ifdef NO_UNDERSCORES
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| 105 | /* Since C identifiers are not normally prefixed with an underscore
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| 106 | on this system, the asm identifier `syscall_error' intrudes on the
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| 107 | C name space. Make sure we use an innocuous name. */
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| 108 | #define syscall_error __syscall_error
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| 109 | #define mcount _mcount
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| 110 | #endif
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| 111 |
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| 112 | #define PSEUDO(name, syscall_name, args) \
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| 113 | .globl syscall_error; \
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| 114 | lose: SYSCALL_PIC_SETUP \
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| 115 | jmp JUMPTARGET(syscall_error); \
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| 116 | ENTRY (name) \
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| 117 | DO_CALL (syscall_name, args); \
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| 118 | jb lose
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| 119 |
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| 120 | #undef PSEUDO_END
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| 121 | #define PSEUDO_END(name) \
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| 122 | END (name)
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| 123 |
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| 124 | #undef JUMPTARGET
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| 125 | #ifdef PIC
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| 126 | #define JUMPTARGET(name) name##@PLT
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| 127 | #define SYSCALL_PIC_SETUP \
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| 128 | pushl %ebx; \
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| 129 | cfi_adjust_cfa_offset (4); \
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| 130 | call 0f; \
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| 131 | 0: popl %ebx; \
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| 132 | cfi_adjust_cfa_offset (-4); \
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| 133 | addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx;
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| 134 |
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| 135 | # ifndef HAVE_HIDDEN
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| 136 | # define SETUP_PIC_REG(reg) \
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| 137 | call 1f; \
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| 138 | .subsection 1; \
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| 139 | 1:movl (%esp), %e##reg; \
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| 140 | ret; \
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| 141 | .previous
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| 142 | # else
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| 143 | # define SETUP_PIC_REG(reg) \
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| 144 | .ifndef __i686.get_pc_thunk.reg; \
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| 145 | .section .gnu.linkonce.t.__i686.get_pc_thunk.reg,"ax",@progbits; \
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| 146 | .globl __i686.get_pc_thunk.reg; \
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| 147 | .hidden __i686.get_pc_thunk.reg; \
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| 148 | .type __i686.get_pc_thunk.reg,@function; \
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| 149 | __i686.get_pc_thunk.reg: \
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| 150 | movl (%esp), %e##reg; \
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| 151 | ret; \
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| 152 | .size __i686.get_pc_thunk.reg, . - __i686.get_pc_thunk.reg; \
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| 153 | .previous; \
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| 154 | .endif; \
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| 155 | call __i686.get_pc_thunk.reg
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| 156 | # endif
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| 157 |
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| 158 | # define LOAD_PIC_REG(reg) \
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| 159 | SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg
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| 160 |
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| 161 | #else
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| 162 | #define JUMPTARGET(name) name
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| 163 | #define SYSCALL_PIC_SETUP /* Nothing. */
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| 164 | #endif
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| 165 |
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| 166 | /* Local label name for asm code. */
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| 167 | #ifndef L
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| 168 | #ifdef HAVE_ELF
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| 169 | #define L(name) .L##name
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| 170 | #else
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| 171 | #define L(name) name
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| 172 | #endif
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| 173 | #endif
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| 174 |
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| 175 | #endif /* __ASSEMBLER__ */
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