[57126] | 1 | ; $Id: PGMR3DbgA.asm 76553 2019-01-01 01:45:53Z vboxsync $
|
---|
| 2 | ;; @file
|
---|
| 3 | ; PGM - Page Manager and Monitor - Debugger & Debugging API Optimizations.
|
---|
| 4 | ;
|
---|
| 5 |
|
---|
| 6 | ;
|
---|
[76553] | 7 | ; Copyright (C) 2006-2019 Oracle Corporation
|
---|
[57126] | 8 | ;
|
---|
| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
|
---|
| 10 | ; available from http://www.virtualbox.org. This file is free software;
|
---|
| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
|
---|
| 12 | ; General Public License (GPL) as published by the Free Software
|
---|
| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
|
---|
| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
---|
| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
---|
| 16 | ;
|
---|
| 17 |
|
---|
| 18 |
|
---|
| 19 | ;*******************************************************************************
|
---|
| 20 | ;* Header Files *
|
---|
| 21 | ;*******************************************************************************
|
---|
| 22 | %define RT_ASM_WITH_SEH64
|
---|
| 23 | %include "VBox/asmdefs.mac"
|
---|
| 24 |
|
---|
[61140] | 25 | BEGINCODE ;; Doesn't end up in code seg on 64-bit darwin. weird.
|
---|
[57126] | 26 |
|
---|
[61140] | 27 |
|
---|
[57126] | 28 | ;
|
---|
| 29 | ; Common to all code below.
|
---|
| 30 | ;
|
---|
| 31 | %ifdef ASM_CALL64_MSC
|
---|
| 32 | %define pvNeedle r8
|
---|
| 33 | %define cbNeedle r9d
|
---|
| 34 | %define bTmp dl
|
---|
| 35 | %elifdef ASM_CALL64_GCC
|
---|
| 36 | %define pvNeedle rdx
|
---|
| 37 | %define cbNeedle esi
|
---|
| 38 | %define bTmp r9b
|
---|
| 39 | %elifdef RT_ARCH_X86
|
---|
| 40 | %define pvNeedle dword [esp + 8h]
|
---|
| 41 | %define cbNeedle dword [esp + 10h]
|
---|
| 42 | %else
|
---|
| 43 | %error "Unsupported arch!"
|
---|
| 44 | %endif
|
---|
| 45 |
|
---|
| 46 | ;;
|
---|
| 47 | ; Searches for a 8 byte needle in steps of 8.
|
---|
| 48 | ;
|
---|
| 49 | ; In 32-bit mode, this will only actually search for a 8 byte needle.
|
---|
| 50 | ;
|
---|
| 51 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:ebp+08h] What to search thru.
|
---|
| 52 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:ebp+0ch] The amount of hay to search.
|
---|
| 53 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:ebp+10h] What we're searching for
|
---|
| 54 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
|
---|
| 55 | ;
|
---|
| 56 | ; @remarks ASSUMES pbHaystack is aligned at uAlign.
|
---|
| 57 | ;
|
---|
| 58 | BEGINPROC pgmR3DbgFixedMemScan8Wide8Step
|
---|
| 59 | %ifdef ASM_CALL64_MSC
|
---|
| 60 | mov r10, rdi ; save it
|
---|
| 61 | mov rdi, rcx ; rdi=pbHaystack
|
---|
| 62 | mov ecx, edx ; rcx=cbHaystack
|
---|
| 63 | mov rax, [r8] ; *(uint64_t *)pvNeedle
|
---|
| 64 | %elifdef ASM_CALL64_GCC
|
---|
| 65 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
|
---|
| 66 | mov rax, [rdx] ; *(uint64_t *)pvNeedle
|
---|
| 67 | %elifdef RT_ARCH_X86
|
---|
[61110] | 68 | push ebp
|
---|
| 69 | mov ebp, esp
|
---|
| 70 | push edi ; save it
|
---|
[57126] | 71 | mov edi, [ebp + 08h] ; pbHaystack
|
---|
| 72 | mov ecx, [ebp + 0ch] ; cbHaystack
|
---|
| 73 | mov eax, [ebp + 10h] ; pvNeedle
|
---|
[61110] | 74 | mov edx, [eax + 4] ; ((uint32_t *)pvNeedle)[1]
|
---|
| 75 | mov eax, [eax] ; ((uint32_t *)pvNeedle)[0]
|
---|
[57126] | 76 | %else
|
---|
| 77 | %error "Unsupported arch!"
|
---|
| 78 | %endif
|
---|
| 79 | SEH64_END_PROLOGUE
|
---|
| 80 |
|
---|
| 81 | %ifdef RT_ARCH_X86
|
---|
[61110] | 82 | ;
|
---|
| 83 | ; No string instruction to help us here. Do a simple tight loop instead.
|
---|
| 84 | ;
|
---|
| 85 | shr ecx, 3
|
---|
| 86 | jz .return_null
|
---|
[57126] | 87 | .again:
|
---|
| 88 | cmp [edi], eax
|
---|
[61110] | 89 | je .needle_check
|
---|
| 90 | .continue:
|
---|
| 91 | add edi, 8
|
---|
[57126] | 92 | dec ecx
|
---|
| 93 | jnz .again
|
---|
| 94 | jmp .return_null
|
---|
[61110] | 95 |
|
---|
| 96 | ; Check the needle 2nd dword, caller can do the rest.
|
---|
| 97 | .needle_check:
|
---|
| 98 | cmp edx, [edi + 4]
|
---|
| 99 | jne .continue
|
---|
| 100 |
|
---|
[57126] | 101 | .return_edi:
|
---|
| 102 | mov eax, edi
|
---|
| 103 |
|
---|
[61110] | 104 | %else ; RT_ARCH_AMD64
|
---|
| 105 | cmp ecx, 8
|
---|
| 106 | jb .return_null
|
---|
[57126] | 107 | .continue:
|
---|
| 108 | shr ecx, 3
|
---|
| 109 | repne scasq
|
---|
| 110 | jne .return_null
|
---|
| 111 | ; check more of the needle if we can.
|
---|
| 112 | mov r11d, 8
|
---|
[61110] | 113 | shl ecx, 3
|
---|
[57126] | 114 | .needle_check:
|
---|
| 115 | cmp cbNeedle, r11d
|
---|
| 116 | je .return_edi
|
---|
[61110] | 117 | cmp ecx, r11d
|
---|
| 118 | jb .return_edi ; returns success here as we've might've lost stuff while shifting ecx around.
|
---|
[57126] | 119 | mov bTmp, [pvNeedle + r11]
|
---|
| 120 | cmp bTmp, [xDI + r11 - 8]
|
---|
| 121 | jne .continue
|
---|
| 122 | inc r11d
|
---|
| 123 | jmp .needle_check
|
---|
| 124 |
|
---|
| 125 | .return_edi:
|
---|
| 126 | lea xAX, [xDI - 8]
|
---|
[61110] | 127 | %endif ; RT_ARCH_AMD64
|
---|
| 128 |
|
---|
[57126] | 129 | .return:
|
---|
| 130 | %ifdef ASM_CALL64_MSC
|
---|
| 131 | mov rdi, r10
|
---|
| 132 | %elifdef RT_ARCH_X86
|
---|
[61110] | 133 | pop edi
|
---|
| 134 | leave
|
---|
[57126] | 135 | %endif
|
---|
| 136 | ret
|
---|
| 137 |
|
---|
| 138 | .return_null:
|
---|
| 139 | xor eax, eax
|
---|
| 140 | jmp .return
|
---|
| 141 | ENDPROC pgmR3DbgFixedMemScan8Wide8Step
|
---|
| 142 |
|
---|
| 143 |
|
---|
| 144 | ;;
|
---|
| 145 | ; Searches for a 4 byte needle in steps of 4.
|
---|
| 146 | ;
|
---|
| 147 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
|
---|
| 148 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
|
---|
| 149 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
|
---|
| 150 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
|
---|
| 151 | ;
|
---|
| 152 | ; @remarks ASSUMES pbHaystack is aligned at uAlign.
|
---|
| 153 | ;
|
---|
| 154 | BEGINPROC pgmR3DbgFixedMemScan4Wide4Step
|
---|
| 155 | %ifdef ASM_CALL64_MSC
|
---|
| 156 | mov r10, rdi ; save it
|
---|
| 157 | mov rdi, rcx ; rdi=pbHaystack
|
---|
| 158 | mov ecx, edx ; rcx=cbHaystack
|
---|
| 159 | mov eax, [r8] ; *(uint32_t *)pvNeedle
|
---|
| 160 | %elifdef ASM_CALL64_GCC
|
---|
| 161 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
|
---|
| 162 | mov eax, [rdx] ; *(uint32_t *)pvNeedle
|
---|
| 163 | %elifdef RT_ARCH_X86
|
---|
| 164 | mov edx, edi ; save it
|
---|
| 165 | mov edi, [esp + 04h] ; pbHaystack
|
---|
| 166 | mov ecx, [esp + 08h] ; cbHaystack
|
---|
| 167 | mov eax, [esp + 0ch] ; pvNeedle
|
---|
| 168 | mov eax, [eax] ; *(uint32_t *)pvNeedle
|
---|
| 169 | %else
|
---|
| 170 | %error "Unsupported arch!"
|
---|
| 171 | %endif
|
---|
| 172 | SEH64_END_PROLOGUE
|
---|
| 173 |
|
---|
| 174 | .continue:
|
---|
| 175 | cmp ecx, 4
|
---|
| 176 | jb .return_null
|
---|
| 177 | shr ecx, 2
|
---|
| 178 | repne scasd
|
---|
| 179 | jne .return_null
|
---|
| 180 |
|
---|
| 181 | %ifdef RT_ARCH_AMD64
|
---|
| 182 | ; check more of the needle if we can.
|
---|
| 183 | mov r11d, 4
|
---|
| 184 | .needle_check:
|
---|
| 185 | cmp cbNeedle, r11d
|
---|
| 186 | je .return_edi
|
---|
| 187 | cmp ecx, r11d ; don't bother converting ecx to bytes.
|
---|
| 188 | jb .return_edi
|
---|
| 189 | mov bTmp, [pvNeedle + r11]
|
---|
| 190 | cmp bTmp, [xDI + r11 - 4]
|
---|
| 191 | jne .continue
|
---|
| 192 | inc r11d
|
---|
| 193 | jmp .needle_check
|
---|
| 194 | %endif
|
---|
| 195 |
|
---|
| 196 | .return_edi:
|
---|
| 197 | lea xAX, [xDI - 4]
|
---|
| 198 | .return:
|
---|
| 199 | %ifdef ASM_CALL64_MSC
|
---|
| 200 | mov rdi, r10
|
---|
| 201 | %elifdef RT_ARCH_X86
|
---|
| 202 | mov edi, edx
|
---|
| 203 | %endif
|
---|
| 204 | ret
|
---|
| 205 |
|
---|
| 206 | .return_null:
|
---|
| 207 | xor eax, eax
|
---|
| 208 | jmp .return
|
---|
| 209 | ENDPROC pgmR3DbgFixedMemScan4Wide4Step
|
---|
| 210 |
|
---|
| 211 |
|
---|
| 212 | ;;
|
---|
| 213 | ; Searches for a 2 byte needle in steps of 2.
|
---|
| 214 | ;
|
---|
| 215 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
|
---|
| 216 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
|
---|
| 217 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
|
---|
| 218 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
|
---|
| 219 | ;
|
---|
| 220 | ; @remarks ASSUMES pbHaystack is aligned at uAlign.
|
---|
| 221 | ;
|
---|
| 222 | BEGINPROC pgmR3DbgFixedMemScan2Wide2Step
|
---|
| 223 | %ifdef ASM_CALL64_MSC
|
---|
| 224 | mov r10, rdi ; save it
|
---|
| 225 | mov rdi, rcx ; rdi=pbHaystack
|
---|
| 226 | mov ecx, edx ; rcx=cbHaystack
|
---|
| 227 | mov ax, [r8] ; *(uint16_t *)pvNeedle
|
---|
| 228 | %elifdef ASM_CALL64_GCC
|
---|
| 229 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
|
---|
| 230 | mov ax, [rdx] ; *(uint16_t *)pvNeedle
|
---|
| 231 | %elifdef RT_ARCH_X86
|
---|
| 232 | mov edx, edi ; save it
|
---|
| 233 | mov edi, [esp + 04h] ; pbHaystack
|
---|
| 234 | mov ecx, [esp + 08h] ; cbHaystack
|
---|
| 235 | mov eax, [esp + 0ch] ; pvNeedle
|
---|
| 236 | mov ax, [eax] ; *(uint16_t *)pvNeedle
|
---|
| 237 | %else
|
---|
| 238 | %error "Unsupported arch!"
|
---|
| 239 | %endif
|
---|
| 240 | SEH64_END_PROLOGUE
|
---|
| 241 |
|
---|
| 242 | .continue:
|
---|
| 243 | cmp ecx, 2
|
---|
| 244 | jb .return_null
|
---|
| 245 | shr ecx, 1
|
---|
| 246 | repne scasw
|
---|
| 247 | jne .return_null
|
---|
| 248 |
|
---|
| 249 | %ifdef RT_ARCH_AMD64
|
---|
| 250 | ; check more of the needle if we can.
|
---|
| 251 | mov r11d, 2
|
---|
| 252 | .needle_check:
|
---|
| 253 | cmp cbNeedle, r11d
|
---|
| 254 | je .return_edi
|
---|
| 255 | cmp ecx, r11d ; don't bother converting ecx to bytes.
|
---|
| 256 | jb .return_edi
|
---|
| 257 | mov bTmp, [pvNeedle + r11]
|
---|
| 258 | cmp bTmp, [xDI + r11 - 2]
|
---|
| 259 | jne .continue
|
---|
| 260 | inc r11d
|
---|
| 261 | jmp .needle_check
|
---|
| 262 | %endif
|
---|
| 263 |
|
---|
| 264 | .return_edi:
|
---|
| 265 | lea xAX, [xDI - 2]
|
---|
| 266 | .return:
|
---|
| 267 | %ifdef ASM_CALL64_MSC
|
---|
| 268 | mov rdi, r10
|
---|
| 269 | %elifdef RT_ARCH_X86
|
---|
| 270 | mov edi, edx
|
---|
| 271 | %endif
|
---|
| 272 | ret
|
---|
| 273 |
|
---|
| 274 | .return_null:
|
---|
| 275 | xor eax, eax
|
---|
| 276 | jmp .return
|
---|
| 277 | ENDPROC pgmR3DbgFixedMemScan2Wide2Step
|
---|
| 278 |
|
---|
| 279 |
|
---|
| 280 | ;;
|
---|
| 281 | ; Searches for a 1 byte needle in steps of 1.
|
---|
| 282 | ;
|
---|
| 283 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
|
---|
| 284 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
|
---|
| 285 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
|
---|
| 286 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
|
---|
| 287 | ;
|
---|
| 288 | BEGINPROC pgmR3DbgFixedMemScan1Wide1Step
|
---|
| 289 | %ifdef ASM_CALL64_MSC
|
---|
| 290 | mov r10, rdi ; save it
|
---|
| 291 | mov rdi, rcx ; rdi=pbHaystack
|
---|
| 292 | mov ecx, edx ; rcx=cbHaystack
|
---|
| 293 | mov al, [r8] ; *(uint8_t *)pvNeedle
|
---|
| 294 | %elifdef ASM_CALL64_GCC
|
---|
| 295 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
|
---|
| 296 | mov al, [rdx] ; *(uint8_t *)pvNeedle
|
---|
| 297 | %elifdef RT_ARCH_X86
|
---|
| 298 | mov edx, edi ; save it
|
---|
| 299 | mov edi, [esp + 04h] ; pbHaystack
|
---|
| 300 | mov ecx, [esp + 08h] ; cbHaystack
|
---|
| 301 | mov eax, [esp + 0ch] ; pvNeedle
|
---|
| 302 | mov al, [eax] ; *(uint8_t *)pvNeedle
|
---|
| 303 | %else
|
---|
| 304 | %error "Unsupported arch!"
|
---|
| 305 | %endif
|
---|
| 306 | SEH64_END_PROLOGUE
|
---|
| 307 |
|
---|
| 308 | cmp ecx, 1
|
---|
| 309 | jb .return_null
|
---|
| 310 | .continue:
|
---|
| 311 | repne scasb
|
---|
| 312 | jne .return_null
|
---|
| 313 |
|
---|
| 314 | %ifdef RT_ARCH_AMD64
|
---|
| 315 | ; check more of the needle if we can.
|
---|
| 316 | mov r11d, 1
|
---|
| 317 | .needle_check:
|
---|
| 318 | cmp cbNeedle, r11d
|
---|
| 319 | je .return_edi
|
---|
| 320 | cmp ecx, r11d
|
---|
| 321 | jb .return_edi
|
---|
| 322 | mov bTmp, [pvNeedle + r11]
|
---|
| 323 | cmp bTmp, [xDI + r11 - 1]
|
---|
| 324 | jne .continue
|
---|
| 325 | inc r11d
|
---|
| 326 | jmp .needle_check
|
---|
| 327 | %endif
|
---|
| 328 |
|
---|
| 329 | .return_edi:
|
---|
| 330 | lea xAX, [xDI - 1]
|
---|
| 331 | .return:
|
---|
| 332 | %ifdef ASM_CALL64_MSC
|
---|
| 333 | mov rdi, r10
|
---|
| 334 | %elifdef RT_ARCH_X86
|
---|
| 335 | mov edi, edx
|
---|
| 336 | %endif
|
---|
| 337 | ret
|
---|
| 338 |
|
---|
| 339 | .return_null:
|
---|
| 340 | xor eax, eax
|
---|
| 341 | %ifdef ASM_CALL64_MSC
|
---|
| 342 | mov rdi, r10
|
---|
| 343 | %elifdef RT_ARCH_X86
|
---|
| 344 | mov edi, edx
|
---|
| 345 | %endif
|
---|
| 346 | ret
|
---|
| 347 | ENDPROC pgmR3DbgFixedMemScan1Wide1Step
|
---|
| 348 |
|
---|
| 349 |
|
---|
| 350 | ;;
|
---|
| 351 | ; Searches for a 4 byte needle in steps of 1.
|
---|
| 352 | ;
|
---|
| 353 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
|
---|
| 354 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
|
---|
| 355 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
|
---|
| 356 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
|
---|
| 357 | ;
|
---|
| 358 | BEGINPROC pgmR3DbgFixedMemScan4Wide1Step
|
---|
| 359 | %ifdef ASM_CALL64_MSC
|
---|
| 360 | mov r10, rdi ; save it
|
---|
| 361 | mov rdi, rcx ; rdi=pbHaystack
|
---|
| 362 | mov ecx, edx ; rcx=cbHaystack
|
---|
| 363 | mov eax, [r8] ; *(uint32_t *)pvNeedle
|
---|
| 364 | %elifdef ASM_CALL64_GCC
|
---|
| 365 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
|
---|
| 366 | mov eax, [rdx] ; *(uint32_t *)pvNeedle
|
---|
| 367 | %elifdef RT_ARCH_X86
|
---|
| 368 | mov edx, edi ; save it
|
---|
| 369 | mov edi, [esp + 04h] ; pbHaystack
|
---|
| 370 | mov ecx, [esp + 08h] ; cbHaystack
|
---|
| 371 | mov eax, [esp + 0ch] ; pvNeedle
|
---|
| 372 | mov eax, [eax] ; *(uint32_t *)pvNeedle
|
---|
| 373 | %else
|
---|
| 374 | %error "Unsupported arch!"
|
---|
| 375 | %endif
|
---|
| 376 | SEH64_END_PROLOGUE
|
---|
| 377 |
|
---|
| 378 | cmp ecx, 1
|
---|
| 379 | jb .return_null
|
---|
| 380 | .continue:
|
---|
| 381 | repne scasb
|
---|
| 382 | jne .return_null
|
---|
| 383 | cmp ecx, 3
|
---|
| 384 | jb .return_null
|
---|
| 385 | cmp eax, [xDI - 1]
|
---|
| 386 | jne .continue
|
---|
| 387 |
|
---|
| 388 | .return_edi:
|
---|
| 389 | lea xAX, [xDI - 1]
|
---|
| 390 | .return:
|
---|
| 391 | %ifdef ASM_CALL64_MSC
|
---|
| 392 | mov rdi, r10
|
---|
| 393 | %elifdef RT_ARCH_X86
|
---|
| 394 | mov edi, edx
|
---|
| 395 | %endif
|
---|
| 396 | ret
|
---|
| 397 |
|
---|
| 398 | .return_null:
|
---|
| 399 | xor eax, eax
|
---|
| 400 | %ifdef ASM_CALL64_MSC
|
---|
| 401 | mov rdi, r10
|
---|
| 402 | %elifdef RT_ARCH_X86
|
---|
| 403 | mov edi, edx
|
---|
| 404 | %endif
|
---|
| 405 | ret
|
---|
| 406 | ENDPROC pgmR3DbgFixedMemScan4Wide1Step
|
---|
| 407 |
|
---|
| 408 | ;;
|
---|
| 409 | ; Searches for a 8 byte needle in steps of 1.
|
---|
| 410 | ;
|
---|
| 411 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
|
---|
| 412 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
|
---|
| 413 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
|
---|
| 414 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
|
---|
| 415 | ;
|
---|
| 416 | ; @remarks The 32-bit version is currently identical to pgmR3DbgFixedMemScan4Wide1Step.
|
---|
| 417 | ;
|
---|
| 418 | BEGINPROC pgmR3DbgFixedMemScan8Wide1Step
|
---|
| 419 | %ifdef ASM_CALL64_MSC
|
---|
| 420 | mov r10, rdi ; save it
|
---|
| 421 | mov rdi, rcx ; rdi=pbHaystack
|
---|
| 422 | mov ecx, edx ; rcx=cbHaystack
|
---|
| 423 | mov rax, [r8] ; *(uint64_t *)pvNeedle
|
---|
| 424 | %elifdef ASM_CALL64_GCC
|
---|
| 425 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
|
---|
| 426 | mov rax, [rdx] ; *(uint64_t *)pvNeedle
|
---|
| 427 | %elifdef RT_ARCH_X86
|
---|
| 428 | mov edx, edi ; save it
|
---|
| 429 | mov edi, [esp + 04h] ; pbHaystack
|
---|
| 430 | mov ecx, [esp + 08h] ; cbHaystack
|
---|
| 431 | mov eax, [esp + 0ch] ; pvNeedle
|
---|
| 432 | mov eax, [eax] ; *(uint32_t *)pvNeedle
|
---|
| 433 | %else
|
---|
| 434 | %error "Unsupported arch!"
|
---|
| 435 | %endif
|
---|
| 436 | SEH64_END_PROLOGUE
|
---|
| 437 |
|
---|
| 438 | cmp ecx, 1
|
---|
| 439 | jb .return_null
|
---|
| 440 | .continue:
|
---|
| 441 | repne scasb
|
---|
| 442 | jne .return_null
|
---|
| 443 | %ifdef RT_ARCH_AMD64
|
---|
| 444 | cmp ecx, 7
|
---|
| 445 | jb .check_smaller
|
---|
| 446 | cmp rax, [xDI - 1]
|
---|
| 447 | jne .continue
|
---|
| 448 | jmp .return_edi
|
---|
| 449 | .check_smaller:
|
---|
| 450 | %endif
|
---|
| 451 | cmp ecx, 3
|
---|
| 452 | jb .return_null
|
---|
| 453 | cmp eax, [xDI - 1]
|
---|
| 454 | jne .continue
|
---|
| 455 |
|
---|
| 456 | .return_edi:
|
---|
| 457 | lea xAX, [xDI - 1]
|
---|
| 458 | .return:
|
---|
| 459 | %ifdef ASM_CALL64_MSC
|
---|
| 460 | mov rdi, r10
|
---|
| 461 | %elifdef RT_ARCH_X86
|
---|
| 462 | mov edi, edx
|
---|
| 463 | %endif
|
---|
| 464 | ret
|
---|
| 465 |
|
---|
| 466 | .return_null:
|
---|
| 467 | xor eax, eax
|
---|
| 468 | %ifdef ASM_CALL64_MSC
|
---|
| 469 | mov rdi, r10
|
---|
| 470 | %elifdef RT_ARCH_X86
|
---|
| 471 | mov edi, edx
|
---|
| 472 | %endif
|
---|
| 473 | ret
|
---|
| 474 | ENDPROC pgmR3DbgFixedMemScan8Wide1Step
|
---|
| 475 |
|
---|