| 1 | ; $Id: PGMR3DbgA.asm 96407 2022-08-22 17:43:14Z vboxsync $
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| 2 | ;; @file
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| 3 | ; PGM - Page Manager and Monitor - Debugger & Debugging API Optimizations.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2006-2022 Oracle and/or its affiliates.
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| 8 | ;
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| 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; SPDX-License-Identifier: GPL-3.0-only
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| 26 | ;
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| 27 |
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| 28 |
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| 29 | ;*******************************************************************************
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| 30 | ;* Header Files *
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| 31 | ;*******************************************************************************
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| 32 | %define RT_ASM_WITH_SEH64
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| 33 | %include "VBox/asmdefs.mac"
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| 34 |
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| 35 | BEGINCODE ;; Doesn't end up in code seg on 64-bit darwin. weird.
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| 36 |
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| 37 |
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| 38 | ;
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| 39 | ; Common to all code below.
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| 40 | ;
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| 41 | %ifdef ASM_CALL64_MSC
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| 42 | %define pvNeedle r8
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| 43 | %define cbNeedle r9d
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| 44 | %define bTmp dl
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| 45 | %elifdef ASM_CALL64_GCC
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| 46 | %define pvNeedle rdx
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| 47 | %define cbNeedle esi
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| 48 | %define bTmp r9b
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| 49 | %elifdef RT_ARCH_X86
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| 50 | %define pvNeedle dword [esp + 8h]
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| 51 | %define cbNeedle dword [esp + 10h]
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| 52 | %else
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| 53 | %error "Unsupported arch!"
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| 54 | %endif
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| 55 |
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| 56 | ;;
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| 57 | ; Searches for a 8 byte needle in steps of 8.
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| 58 | ;
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| 59 | ; In 32-bit mode, this will only actually search for a 8 byte needle.
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| 60 | ;
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| 61 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:ebp+08h] What to search thru.
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| 62 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:ebp+0ch] The amount of hay to search.
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| 63 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:ebp+10h] What we're searching for
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| 64 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
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| 65 | ;
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| 66 | ; @remarks ASSUMES pbHaystack is aligned at uAlign.
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| 67 | ;
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| 68 | BEGINPROC pgmR3DbgFixedMemScan8Wide8Step
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| 69 | %ifdef ASM_CALL64_MSC
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| 70 | mov r10, rdi ; save it
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| 71 | mov rdi, rcx ; rdi=pbHaystack
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| 72 | mov ecx, edx ; rcx=cbHaystack
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| 73 | mov rax, [r8] ; *(uint64_t *)pvNeedle
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| 74 | %elifdef ASM_CALL64_GCC
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| 75 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
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| 76 | mov rax, [rdx] ; *(uint64_t *)pvNeedle
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| 77 | %elifdef RT_ARCH_X86
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| 78 | push ebp
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| 79 | mov ebp, esp
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| 80 | push edi ; save it
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| 81 | mov edi, [ebp + 08h] ; pbHaystack
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| 82 | mov ecx, [ebp + 0ch] ; cbHaystack
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| 83 | mov eax, [ebp + 10h] ; pvNeedle
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| 84 | mov edx, [eax + 4] ; ((uint32_t *)pvNeedle)[1]
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| 85 | mov eax, [eax] ; ((uint32_t *)pvNeedle)[0]
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| 86 | %else
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| 87 | %error "Unsupported arch!"
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| 88 | %endif
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| 89 | SEH64_END_PROLOGUE
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| 90 |
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| 91 | %ifdef RT_ARCH_X86
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| 92 | ;
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| 93 | ; No string instruction to help us here. Do a simple tight loop instead.
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| 94 | ;
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| 95 | shr ecx, 3
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| 96 | jz .return_null
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| 97 | .again:
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| 98 | cmp [edi], eax
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| 99 | je .needle_check
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| 100 | .continue:
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| 101 | add edi, 8
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| 102 | dec ecx
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| 103 | jnz .again
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| 104 | jmp .return_null
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| 105 |
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| 106 | ; Check the needle 2nd dword, caller can do the rest.
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| 107 | .needle_check:
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| 108 | cmp edx, [edi + 4]
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| 109 | jne .continue
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| 110 |
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| 111 | .return_edi:
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| 112 | mov eax, edi
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| 113 |
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| 114 | %else ; RT_ARCH_AMD64
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| 115 | cmp ecx, 8
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| 116 | jb .return_null
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| 117 | .continue:
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| 118 | shr ecx, 3
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| 119 | repne scasq
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| 120 | jne .return_null
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| 121 | ; check more of the needle if we can.
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| 122 | mov r11d, 8
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| 123 | shl ecx, 3
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| 124 | .needle_check:
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| 125 | cmp cbNeedle, r11d
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| 126 | je .return_edi
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| 127 | cmp ecx, r11d
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| 128 | jb .return_edi ; returns success here as we've might've lost stuff while shifting ecx around.
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| 129 | mov bTmp, [pvNeedle + r11]
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| 130 | cmp bTmp, [xDI + r11 - 8]
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| 131 | jne .continue
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| 132 | inc r11d
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| 133 | jmp .needle_check
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| 134 |
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| 135 | .return_edi:
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| 136 | lea xAX, [xDI - 8]
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| 137 | %endif ; RT_ARCH_AMD64
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| 138 |
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| 139 | .return:
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| 140 | %ifdef ASM_CALL64_MSC
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| 141 | mov rdi, r10
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| 142 | %elifdef RT_ARCH_X86
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| 143 | pop edi
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| 144 | leave
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| 145 | %endif
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| 146 | ret
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| 147 |
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| 148 | .return_null:
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| 149 | xor eax, eax
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| 150 | jmp .return
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| 151 | ENDPROC pgmR3DbgFixedMemScan8Wide8Step
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| 152 |
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| 153 |
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| 154 | ;;
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| 155 | ; Searches for a 4 byte needle in steps of 4.
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| 156 | ;
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| 157 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
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| 158 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
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| 159 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
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| 160 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
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| 161 | ;
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| 162 | ; @remarks ASSUMES pbHaystack is aligned at uAlign.
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| 163 | ;
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| 164 | BEGINPROC pgmR3DbgFixedMemScan4Wide4Step
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| 165 | %ifdef ASM_CALL64_MSC
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| 166 | mov r10, rdi ; save it
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| 167 | mov rdi, rcx ; rdi=pbHaystack
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| 168 | mov ecx, edx ; rcx=cbHaystack
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| 169 | mov eax, [r8] ; *(uint32_t *)pvNeedle
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| 170 | %elifdef ASM_CALL64_GCC
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| 171 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
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| 172 | mov eax, [rdx] ; *(uint32_t *)pvNeedle
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| 173 | %elifdef RT_ARCH_X86
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| 174 | mov edx, edi ; save it
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| 175 | mov edi, [esp + 04h] ; pbHaystack
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| 176 | mov ecx, [esp + 08h] ; cbHaystack
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| 177 | mov eax, [esp + 0ch] ; pvNeedle
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| 178 | mov eax, [eax] ; *(uint32_t *)pvNeedle
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| 179 | %else
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| 180 | %error "Unsupported arch!"
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| 181 | %endif
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| 182 | SEH64_END_PROLOGUE
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| 183 |
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| 184 | .continue:
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| 185 | cmp ecx, 4
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| 186 | jb .return_null
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| 187 | shr ecx, 2
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| 188 | repne scasd
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| 189 | jne .return_null
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| 190 |
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| 191 | %ifdef RT_ARCH_AMD64
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| 192 | ; check more of the needle if we can.
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| 193 | mov r11d, 4
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| 194 | .needle_check:
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| 195 | cmp cbNeedle, r11d
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| 196 | je .return_edi
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| 197 | cmp ecx, r11d ; don't bother converting ecx to bytes.
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| 198 | jb .return_edi
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| 199 | mov bTmp, [pvNeedle + r11]
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| 200 | cmp bTmp, [xDI + r11 - 4]
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| 201 | jne .continue
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| 202 | inc r11d
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| 203 | jmp .needle_check
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| 204 | %endif
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| 205 |
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| 206 | .return_edi:
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| 207 | lea xAX, [xDI - 4]
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| 208 | .return:
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| 209 | %ifdef ASM_CALL64_MSC
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| 210 | mov rdi, r10
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| 211 | %elifdef RT_ARCH_X86
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| 212 | mov edi, edx
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| 213 | %endif
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| 214 | ret
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| 215 |
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| 216 | .return_null:
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| 217 | xor eax, eax
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| 218 | jmp .return
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| 219 | ENDPROC pgmR3DbgFixedMemScan4Wide4Step
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| 220 |
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| 221 |
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| 222 | ;;
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| 223 | ; Searches for a 2 byte needle in steps of 2.
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| 224 | ;
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| 225 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
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| 226 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
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| 227 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
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| 228 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
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| 229 | ;
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| 230 | ; @remarks ASSUMES pbHaystack is aligned at uAlign.
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| 231 | ;
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| 232 | BEGINPROC pgmR3DbgFixedMemScan2Wide2Step
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| 233 | %ifdef ASM_CALL64_MSC
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| 234 | mov r10, rdi ; save it
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| 235 | mov rdi, rcx ; rdi=pbHaystack
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| 236 | mov ecx, edx ; rcx=cbHaystack
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| 237 | mov ax, [r8] ; *(uint16_t *)pvNeedle
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| 238 | %elifdef ASM_CALL64_GCC
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| 239 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
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| 240 | mov ax, [rdx] ; *(uint16_t *)pvNeedle
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| 241 | %elifdef RT_ARCH_X86
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| 242 | mov edx, edi ; save it
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| 243 | mov edi, [esp + 04h] ; pbHaystack
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| 244 | mov ecx, [esp + 08h] ; cbHaystack
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| 245 | mov eax, [esp + 0ch] ; pvNeedle
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| 246 | mov ax, [eax] ; *(uint16_t *)pvNeedle
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| 247 | %else
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| 248 | %error "Unsupported arch!"
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| 249 | %endif
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| 250 | SEH64_END_PROLOGUE
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| 251 |
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| 252 | .continue:
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| 253 | cmp ecx, 2
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| 254 | jb .return_null
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| 255 | shr ecx, 1
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| 256 | repne scasw
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| 257 | jne .return_null
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| 258 |
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| 259 | %ifdef RT_ARCH_AMD64
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| 260 | ; check more of the needle if we can.
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| 261 | mov r11d, 2
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| 262 | .needle_check:
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| 263 | cmp cbNeedle, r11d
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| 264 | je .return_edi
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| 265 | cmp ecx, r11d ; don't bother converting ecx to bytes.
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| 266 | jb .return_edi
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| 267 | mov bTmp, [pvNeedle + r11]
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| 268 | cmp bTmp, [xDI + r11 - 2]
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| 269 | jne .continue
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| 270 | inc r11d
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| 271 | jmp .needle_check
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| 272 | %endif
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| 273 |
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| 274 | .return_edi:
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| 275 | lea xAX, [xDI - 2]
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| 276 | .return:
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| 277 | %ifdef ASM_CALL64_MSC
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| 278 | mov rdi, r10
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| 279 | %elifdef RT_ARCH_X86
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| 280 | mov edi, edx
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| 281 | %endif
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| 282 | ret
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| 283 |
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| 284 | .return_null:
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| 285 | xor eax, eax
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| 286 | jmp .return
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| 287 | ENDPROC pgmR3DbgFixedMemScan2Wide2Step
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| 288 |
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| 289 |
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| 290 | ;;
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| 291 | ; Searches for a 1 byte needle in steps of 1.
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| 292 | ;
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| 293 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
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| 294 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
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| 295 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
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| 296 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
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| 297 | ;
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| 298 | BEGINPROC pgmR3DbgFixedMemScan1Wide1Step
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| 299 | %ifdef ASM_CALL64_MSC
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| 300 | mov r10, rdi ; save it
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| 301 | mov rdi, rcx ; rdi=pbHaystack
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| 302 | mov ecx, edx ; rcx=cbHaystack
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| 303 | mov al, [r8] ; *(uint8_t *)pvNeedle
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| 304 | %elifdef ASM_CALL64_GCC
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| 305 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
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| 306 | mov al, [rdx] ; *(uint8_t *)pvNeedle
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| 307 | %elifdef RT_ARCH_X86
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| 308 | mov edx, edi ; save it
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| 309 | mov edi, [esp + 04h] ; pbHaystack
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| 310 | mov ecx, [esp + 08h] ; cbHaystack
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| 311 | mov eax, [esp + 0ch] ; pvNeedle
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| 312 | mov al, [eax] ; *(uint8_t *)pvNeedle
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| 313 | %else
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| 314 | %error "Unsupported arch!"
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| 315 | %endif
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| 316 | SEH64_END_PROLOGUE
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| 317 |
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| 318 | cmp ecx, 1
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| 319 | jb .return_null
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| 320 | .continue:
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| 321 | repne scasb
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| 322 | jne .return_null
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| 323 |
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| 324 | %ifdef RT_ARCH_AMD64
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| 325 | ; check more of the needle if we can.
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| 326 | mov r11d, 1
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| 327 | .needle_check:
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| 328 | cmp cbNeedle, r11d
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| 329 | je .return_edi
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| 330 | cmp ecx, r11d
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| 331 | jb .return_edi
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| 332 | mov bTmp, [pvNeedle + r11]
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| 333 | cmp bTmp, [xDI + r11 - 1]
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| 334 | jne .continue
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| 335 | inc r11d
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| 336 | jmp .needle_check
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| 337 | %endif
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| 338 |
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| 339 | .return_edi:
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| 340 | lea xAX, [xDI - 1]
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| 341 | .return:
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| 342 | %ifdef ASM_CALL64_MSC
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| 343 | mov rdi, r10
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| 344 | %elifdef RT_ARCH_X86
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| 345 | mov edi, edx
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| 346 | %endif
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| 347 | ret
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| 348 |
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| 349 | .return_null:
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| 350 | xor eax, eax
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| 351 | %ifdef ASM_CALL64_MSC
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| 352 | mov rdi, r10
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| 353 | %elifdef RT_ARCH_X86
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| 354 | mov edi, edx
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| 355 | %endif
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| 356 | ret
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| 357 | ENDPROC pgmR3DbgFixedMemScan1Wide1Step
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| 358 |
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| 359 |
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| 360 | ;;
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| 361 | ; Searches for a 4 byte needle in steps of 1.
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| 362 | ;
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| 363 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
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| 364 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
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| 365 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
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| 366 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
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| 367 | ;
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| 368 | BEGINPROC pgmR3DbgFixedMemScan4Wide1Step
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| 369 | %ifdef ASM_CALL64_MSC
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| 370 | mov r10, rdi ; save it
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| 371 | mov rdi, rcx ; rdi=pbHaystack
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| 372 | mov ecx, edx ; rcx=cbHaystack
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| 373 | mov eax, [r8] ; *(uint32_t *)pvNeedle
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| 374 | %elifdef ASM_CALL64_GCC
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| 375 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
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| 376 | mov eax, [rdx] ; *(uint32_t *)pvNeedle
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| 377 | %elifdef RT_ARCH_X86
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| 378 | mov edx, edi ; save it
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| 379 | mov edi, [esp + 04h] ; pbHaystack
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| 380 | mov ecx, [esp + 08h] ; cbHaystack
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| 381 | mov eax, [esp + 0ch] ; pvNeedle
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| 382 | mov eax, [eax] ; *(uint32_t *)pvNeedle
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| 383 | %else
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| 384 | %error "Unsupported arch!"
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| 385 | %endif
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| 386 | SEH64_END_PROLOGUE
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| 387 |
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| 388 | cmp ecx, 1
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| 389 | jb .return_null
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| 390 | .continue:
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| 391 | repne scasb
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| 392 | jne .return_null
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| 393 | cmp ecx, 3
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| 394 | jb .return_null
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| 395 | cmp eax, [xDI - 1]
|
|---|
| 396 | jne .continue
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| 397 |
|
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| 398 | .return_edi:
|
|---|
| 399 | lea xAX, [xDI - 1]
|
|---|
| 400 | .return:
|
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| 401 | %ifdef ASM_CALL64_MSC
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| 402 | mov rdi, r10
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| 403 | %elifdef RT_ARCH_X86
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| 404 | mov edi, edx
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| 405 | %endif
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| 406 | ret
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| 407 |
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| 408 | .return_null:
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| 409 | xor eax, eax
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|---|
| 410 | %ifdef ASM_CALL64_MSC
|
|---|
| 411 | mov rdi, r10
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|---|
| 412 | %elifdef RT_ARCH_X86
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|---|
| 413 | mov edi, edx
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|---|
| 414 | %endif
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| 415 | ret
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| 416 | ENDPROC pgmR3DbgFixedMemScan4Wide1Step
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|---|
| 417 |
|
|---|
| 418 | ;;
|
|---|
| 419 | ; Searches for a 8 byte needle in steps of 1.
|
|---|
| 420 | ;
|
|---|
| 421 | ; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
|
|---|
| 422 | ; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
|
|---|
| 423 | ; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
|
|---|
| 424 | ; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
|
|---|
| 425 | ;
|
|---|
| 426 | ; @remarks The 32-bit version is currently identical to pgmR3DbgFixedMemScan4Wide1Step.
|
|---|
| 427 | ;
|
|---|
| 428 | BEGINPROC pgmR3DbgFixedMemScan8Wide1Step
|
|---|
| 429 | %ifdef ASM_CALL64_MSC
|
|---|
| 430 | mov r10, rdi ; save it
|
|---|
| 431 | mov rdi, rcx ; rdi=pbHaystack
|
|---|
| 432 | mov ecx, edx ; rcx=cbHaystack
|
|---|
| 433 | mov rax, [r8] ; *(uint64_t *)pvNeedle
|
|---|
| 434 | %elifdef ASM_CALL64_GCC
|
|---|
| 435 | xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
|
|---|
| 436 | mov rax, [rdx] ; *(uint64_t *)pvNeedle
|
|---|
| 437 | %elifdef RT_ARCH_X86
|
|---|
| 438 | mov edx, edi ; save it
|
|---|
| 439 | mov edi, [esp + 04h] ; pbHaystack
|
|---|
| 440 | mov ecx, [esp + 08h] ; cbHaystack
|
|---|
| 441 | mov eax, [esp + 0ch] ; pvNeedle
|
|---|
| 442 | mov eax, [eax] ; *(uint32_t *)pvNeedle
|
|---|
| 443 | %else
|
|---|
| 444 | %error "Unsupported arch!"
|
|---|
| 445 | %endif
|
|---|
| 446 | SEH64_END_PROLOGUE
|
|---|
| 447 |
|
|---|
| 448 | cmp ecx, 1
|
|---|
| 449 | jb .return_null
|
|---|
| 450 | .continue:
|
|---|
| 451 | repne scasb
|
|---|
| 452 | jne .return_null
|
|---|
| 453 | %ifdef RT_ARCH_AMD64
|
|---|
| 454 | cmp ecx, 7
|
|---|
| 455 | jb .check_smaller
|
|---|
| 456 | cmp rax, [xDI - 1]
|
|---|
| 457 | jne .continue
|
|---|
| 458 | jmp .return_edi
|
|---|
| 459 | .check_smaller:
|
|---|
| 460 | %endif
|
|---|
| 461 | cmp ecx, 3
|
|---|
| 462 | jb .return_null
|
|---|
| 463 | cmp eax, [xDI - 1]
|
|---|
| 464 | jne .continue
|
|---|
| 465 |
|
|---|
| 466 | .return_edi:
|
|---|
| 467 | lea xAX, [xDI - 1]
|
|---|
| 468 | .return:
|
|---|
| 469 | %ifdef ASM_CALL64_MSC
|
|---|
| 470 | mov rdi, r10
|
|---|
| 471 | %elifdef RT_ARCH_X86
|
|---|
| 472 | mov edi, edx
|
|---|
| 473 | %endif
|
|---|
| 474 | ret
|
|---|
| 475 |
|
|---|
| 476 | .return_null:
|
|---|
| 477 | xor eax, eax
|
|---|
| 478 | %ifdef ASM_CALL64_MSC
|
|---|
| 479 | mov rdi, r10
|
|---|
| 480 | %elifdef RT_ARCH_X86
|
|---|
| 481 | mov edi, edx
|
|---|
| 482 | %endif
|
|---|
| 483 | ret
|
|---|
| 484 | ENDPROC pgmR3DbgFixedMemScan8Wide1Step
|
|---|
| 485 |
|
|---|
