| 1 | ;
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| 2 | ; SYMBOLS.ASM -- Manage symbol tables
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| 3 | ;
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| 4 | ; Copyright (c) 1991-1995 by Eberhard Mattes
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| 5 | ;
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| 6 | ; This file is part of emx.
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| 7 | ;
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| 8 | ; emx is free software; you can redistribute it and/or modify it
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| 9 | ; under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2, or (at your option)
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| 11 | ; any later version.
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| 12 | ;
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| 13 | ; emx is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ;
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| 18 | ; You should have received a copy of the GNU General Public License
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| 19 | ; along with emx; see the file COPYING. If not, write to
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| 20 | ; the Free Software Foundation, 59 Temple Place - Suite 330,
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| 21 | ; Boston, MA 02111-1307, USA.
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| 22 | ;
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| 23 | ; See emx.asm for a special exception.
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| 24 | ;
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| 25 |
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| 26 | __SYMBOLS = 1
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| 27 |
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| 28 | INCLUDE EMX.INC
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| 29 | INCLUDE SYMBOLS.INC
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| 30 | INCLUDE SIGNAL.INC
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| 31 | INCLUDE PROCESS.INC
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| 32 |
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| 33 | PUBLIC SYM_BY_NAME, SYM_BY_ADDR, SYM_MODULE, SYM_BEFORE
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| 34 |
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| 35 | SV_CODE SEGMENT
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| 36 |
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| 37 | ASSUME CS:SV_CODE, DS:NOTHING
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| 38 |
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| 39 | ;
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| 40 | ; In: DS:DI Pointer to process table entry
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| 41 | ; DS:BX Name of symbol (0 terminated)
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| 42 | ; LDTR Set for process
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| 43 | ;
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| 44 | ; Out: EDX Address
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| 45 | ; AL Code/data
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| 46 | ; CY Not found
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| 47 | ;
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| 48 | ; Note: Assumes that symbols in the string table are unique
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| 49 | ;
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| 50 | ASSUME DI:PTR PROCESS
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| 51 | SYM_BY_NAME PROC NEAR
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| 52 | PUSH ES
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| 53 | PUSH ECX
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| 54 | PUSH ESI
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| 55 | PUSH EBP
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| 56 | MOV DX, BX
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| 57 | CMP [DI].P_SYMBOLS, 0
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| 58 | JE SBN_LOOSE
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| 59 | MOV AX, L_SYM_SEL
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| 60 | .386P
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| 61 | VERR AX
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| 62 | .386
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| 63 | JNZ SBN_LOOSE
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| 64 | MOV ES, AX
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| 65 | MOV ESI, [DI].P_STR_OFF
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| 66 | MOV ECX, ES:[ESI]
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| 67 | ADD ECX, ESI
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| 68 | ADD ESI, 4
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| 69 | SBN1: MOV BX, DX
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| 70 | CMP ESI, ECX
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| 71 | JAE SHORT SBN_LOOSE
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| 72 | MOV EBP, ESI
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| 73 | SBN2: MOV AL, ES:[ESI]
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| 74 | CMP AL, [BX]
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| 75 | JNE SHORT SBN3
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| 76 | INC BX
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| 77 | INC ESI
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| 78 | OR AL, AL
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| 79 | JNZ SHORT SBN2
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| 80 | JMP SHORT SBN4
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| 81 |
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| 82 | SBN3: INC ESI
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| 83 | CMP BYTE PTR ES:[ESI-1], 0
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| 84 | JNE SHORT SBN3
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| 85 | JMP SHORT SBN1
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| 86 |
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| 87 | SBN4: SUB EBP, [DI].P_STR_OFF
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| 88 | MOV ESI, 0
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| 89 | ASSUME ESI:NEAR32 PTR NLIST
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| 90 | MOV ECX, [DI].P_SYMBOLS
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| 91 | SBN5: CMP ES:[ESI].N_STRING, EBP
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| 92 | JE SHORT SBN7
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| 93 | SBN6: ADD ESI, SIZE NLIST
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| 94 | LOOPD SBN5
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| 95 | JMP SHORT SBN_LOOSE
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| 96 |
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| 97 | SBN7: MOV AL, ES:[ESI].N_TYPE
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| 98 | AND AL, NOT N_EXT
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| 99 | MOV AH, SYM_TEXT
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| 100 | CMP AL, N_TEXT
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| 101 | JE SHORT SBN8
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| 102 | MOV AH, SYM_DATA
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| 103 | CMP AL, N_DATA
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| 104 | JE SHORT SBN8
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| 105 | CMP AL, N_BSS
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| 106 | JE SHORT SBN8
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| 107 | JMP SHORT SBN6
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| 108 |
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| 109 | SBN8: MOV AL, AH
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| 110 | MOV BX, DX
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| 111 | MOV EDX, ES:[ESI].N_VALUE
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| 112 | CLC
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| 113 | JMP SHORT SBN_RET
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| 114 |
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| 115 | SBN_LOOSE: STC
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| 116 | MOV BX, DX
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| 117 | SBN_RET: POP EBP
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| 118 | POP ESI
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| 119 | POP ECX
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| 120 | POP ES
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| 121 | RET
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| 122 | ASSUME ESI:NOTHING
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| 123 | ASSUME DI:NOTHING
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| 124 | SYM_BY_NAME ENDP
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| 125 |
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| 126 |
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| 127 | ;
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| 128 | ; In: DS:DI Pointer to process table entry
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| 129 | ; EDX Address
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| 130 | ; AL Code/data
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| 131 | ; LDTR Set for process
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| 132 | ;
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| 133 | ; Out: ES:EBX Pointer to name
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| 134 | ; DX Descriptor (line number)
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| 135 | ; CY Not found
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| 136 | ;
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| 137 | ; This function searches the list backwards, to meet a `real' symbol
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| 138 | ; before a file name (eg, __time before time.o). Yes, it's a hack.
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| 139 | ;
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| 140 | ASSUME DI:PTR PROCESS
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| 141 | SYM_BY_ADDR PROC NEAR
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| 142 | PUSH ECX
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| 143 | PUSH ESI
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| 144 | PUSH EBP
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| 145 | MOV BL, AL
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| 146 | CMP [DI].P_SYMBOLS, 0
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| 147 | JE SBA_LOOSE
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| 148 | MOV AX, L_SYM_SEL
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| 149 | .386P
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| 150 | VERR AX
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| 151 | .386
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| 152 | JNZ SBA_LOOSE
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| 153 | MOV ES, AX
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| 154 | MOV ECX, [DI].P_SYMBOLS
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| 155 | MOV ESI, ECX
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| 156 | DEC ESI
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| 157 | IMUL ESI, SIZE NLIST
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| 158 | ASSUME ESI:NEAR32 PTR NLIST
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| 159 | SBA1: CMP ES:[ESI].N_VALUE, EDX
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| 160 | JE SHORT SBA3
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| 161 | SBA2: SUB ESI, SIZE NLIST
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| 162 | LOOPD SBA1
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| 163 | JMP SHORT SBA_LOOSE
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| 164 |
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| 165 | SBA3: MOV AL, ES:[ESI].N_TYPE
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| 166 | AND AL, NOT N_EXT
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| 167 | MOV AH, SYM_TEXT
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| 168 | CMP AL, N_TEXT
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| 169 | JE SHORT SBA4
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| 170 | MOV AH, SYM_DATA
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| 171 | CMP AL, N_DATA
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| 172 | JE SHORT SBA4
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| 173 | CMP AL, N_BSS
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| 174 | JE SHORT SBA4
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| 175 | CMP AL, N_SLINE
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| 176 | JNE SHORT SBA2
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| 177 | CMP BL, SYM_LINE
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| 178 | JNE SHORT SBA2
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| 179 | JMP SHORT SBA5
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| 180 |
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| 181 | SBA4: CMP BL, SYM_ANY
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| 182 | JE SHORT SBA5
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| 183 | CMP BL, AH
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| 184 | JNE SHORT SBA2
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| 185 | SBA5: MOV EBX, ES:[ESI].N_STRING
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| 186 | ADD EBX, [DI].P_STR_OFF
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| 187 | MOV DX, ES:[ESI].N_DESC
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| 188 | CLC
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| 189 | JMP SHORT SBA_RET
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| 190 |
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| 191 | SBA_LOOSE: STC
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| 192 | SBA_RET: POP EBP
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| 193 | POP ESI
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| 194 | POP ECX
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| 195 | RET
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| 196 | ASSUME ESI:NOTHING
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| 197 | ASSUME DI:NOTHING
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| 198 | SYM_BY_ADDR ENDP
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| 199 |
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| 200 |
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| 201 | ;
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| 202 | ; In: DS:DI Pointer to process table entry
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| 203 | ; EDX Address
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| 204 | ; LDTR Set for process
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| 205 | ;
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| 206 | ; Out: ES:EBX Pointer to file name
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| 207 | ; CY Not found
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| 208 | ;
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| 209 | ; This functions assumes that the list is sorted by address.
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| 210 | ;
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| 211 | ASSUME DI:PTR PROCESS
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| 212 | SYM_MODULE PROC NEAR
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| 213 | PUSH ECX
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| 214 | PUSH ESI
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| 215 | PUSH EBP
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| 216 | CMP [DI].P_SYMBOLS, 0
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| 217 | JE SBM_LOOSE
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| 218 | MOV AX, L_SYM_SEL
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| 219 | .386P
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| 220 | VERR AX
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| 221 | .386
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| 222 | JNZ SBM_LOOSE
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| 223 | MOV ES, AX
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| 224 | MOV ECX, [DI].P_SYMBOLS
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| 225 | MOV ESI, 0
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| 226 | ASSUME ESI:NEAR32 PTR NLIST
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| 227 | MOV EBP, -1 ; Nothing found yet
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| 228 | SBM1: MOV AL, ES:[ESI].N_TYPE
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| 229 | CMP AL, 64H ; Main module
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| 230 | JE SHORT SBM4
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| 231 | CMP AL, 84H ; Submodule
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| 232 | JE SHORT SBM4
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| 233 | SBM2: ADD ESI, SIZE NLIST
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| 234 | LOOPD SBM1
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| 235 | SBM3: CMP EBP, -1
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| 236 | JE SHORT SBM_LOOSE
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| 237 | MOV ESI, EBP
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| 238 | MOV EBX, ES:[ESI].N_STRING
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| 239 | ADD EBX, [DI].P_STR_OFF
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| 240 | CLC
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| 241 | JMP SHORT SBM_RET
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| 242 |
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| 243 | SBM4: CMP ES:[ESI].N_VALUE, EDX
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| 244 | JA SHORT SBM3
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| 245 | MOV EBP, ESI
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| 246 | JMP SHORT SBM2
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| 247 |
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| 248 | SBM_LOOSE: STC
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| 249 | SBM_RET: POP EBP
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| 250 | POP ESI
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| 251 | POP ECX
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| 252 | RET
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| 253 | ASSUME ESI:NOTHING
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| 254 | ASSUME DI:NOTHING
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| 255 | SYM_MODULE ENDP
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| 256 |
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| 257 |
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| 258 | ;
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| 259 | ; In: DS:DI Pointer to process table entry
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| 260 | ; EDX Address
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| 261 | ; LDTR Set for process
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| 262 | ;
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| 263 | ; Out: ES:EBX Pointer to name
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| 264 | ; EAX Address
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| 265 | ; CY Not found
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| 266 | ;
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| 267 | ; This functions assumes that file names come after other symbols.
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| 268 | ;
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| 269 | ASSUME DI:PTR PROCESS
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| 270 | SYM_BEFORE PROC NEAR
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| 271 | PUSH ECX
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| 272 | PUSH ESI
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| 273 | PUSH EBP
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| 274 | CMP [DI].P_SYMBOLS, 0
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| 275 | JE SBB_LOOSE
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| 276 | MOV AX, L_SYM_SEL
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| 277 | .386P
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| 278 | VERR AX
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| 279 | .386
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| 280 | JNZ SBB_LOOSE
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| 281 | MOV ES, AX
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| 282 | MOV EBP, -1 ; Nothing found yet
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| 283 | MOV ECX, [DI].P_SYMBOLS
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| 284 | MOV ESI, 0
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| 285 | ASSUME ESI:NEAR32 PTR NLIST
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| 286 | MOV EBP, -1
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| 287 | MOV EBX, 0
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| 288 | SBB1: MOV AL, ES:[ESI].N_TYPE
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| 289 | AND AL, NOT N_EXT
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| 290 | CMP AL, N_TEXT
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| 291 | JE SHORT SBB3
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| 292 | CMP AL, N_DATA
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| 293 | JE SHORT SBB3
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| 294 | CMP AL, N_BSS
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| 295 | JE SHORT SBB3
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| 296 | SBB2: ADD ESI, SIZE NLIST
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| 297 | LOOPD SBB1
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| 298 | CMP EBP, -1
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| 299 | JE SHORT SBB_LOOSE
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| 300 | MOV ESI, EBP
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| 301 | MOV EBX, ES:[ESI].N_STRING
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| 302 | ADD EBX, [DI].P_STR_OFF
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| 303 | MOV EAX, ES:[ESI].N_VALUE
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| 304 | CLC
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| 305 | JMP SHORT SBB_RET
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| 306 |
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| 307 |
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| 308 | SBB3: CMP ES:[ESI].N_VALUE, EDX
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| 309 | JA SHORT SBB2
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| 310 | CMP ES:[ESI].N_VALUE, EBX
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| 311 | JB SHORT SBB2
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| 312 | MOV EBP, ESI
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| 313 | MOV EBX, ES:[ESI].N_VALUE
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| 314 | JMP SHORT SBB2
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| 315 |
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| 316 | SBB_LOOSE: STC
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| 317 | SBB_RET: POP EBP
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| 318 | POP ESI
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| 319 | POP ECX
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| 320 | RET
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| 321 | ASSUME ESI:NOTHING
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| 322 | ASSUME DI:NOTHING
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| 323 | SYM_BEFORE ENDP
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| 324 |
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| 325 |
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| 326 |
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| 327 |
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| 328 | SV_CODE ENDS
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| 329 |
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| 330 | END
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