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|
; $Id: PGMR3DbgA.asm $
;; @file
; PGM - Page Manager and Monitor - Debugger & Debugging API Optimizations.
;
;
; Copyright (C) 2006-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
;*******************************************************************************
;* Header Files *
;*******************************************************************************
%define RT_ASM_WITH_SEH64
%include "VBox/asmdefs.mac"
BEGINCODE ;; Doesn't end up in code seg on 64-bit darwin. weird.
;
; Common to all code below.
;
%ifdef ASM_CALL64_MSC
%define pvNeedle r8
%define cbNeedle r9d
%define bTmp dl
%elifdef ASM_CALL64_GCC
%define pvNeedle rdx
%define cbNeedle esi
%define bTmp r9b
%elifdef RT_ARCH_X86
%define pvNeedle dword [esp + 8h]
%define cbNeedle dword [esp + 10h]
%else
%error "Unsupported arch!"
%endif
;;
; Searches for a 8 byte needle in steps of 8.
;
; In 32-bit mode, this will only actually search for a 8 byte needle.
;
; @param pbHaystack [msc:rcx, gcc:rdi, x86:ebp+08h] What to search thru.
; @param cbHaystack [msc:edx, gcc:rsi, x86:ebp+0ch] The amount of hay to search.
; @param pvNeedle [msc:r8, gcc:rdx, x86:ebp+10h] What we're searching for
; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
;
; @remarks ASSUMES pbHaystack is aligned at uAlign.
;
BEGINPROC pgmR3DbgFixedMemScan8Wide8Step
%ifdef ASM_CALL64_MSC
mov r10, rdi ; save it
mov rdi, rcx ; rdi=pbHaystack
mov ecx, edx ; rcx=cbHaystack
mov rax, [r8] ; *(uint64_t *)pvNeedle
%elifdef ASM_CALL64_GCC
xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
mov rax, [rdx] ; *(uint64_t *)pvNeedle
%elifdef RT_ARCH_X86
push ebp
mov ebp, esp
push edi ; save it
mov edi, [ebp + 08h] ; pbHaystack
mov ecx, [ebp + 0ch] ; cbHaystack
mov eax, [ebp + 10h] ; pvNeedle
mov edx, [eax + 4] ; ((uint32_t *)pvNeedle)[1]
mov eax, [eax] ; ((uint32_t *)pvNeedle)[0]
%else
%error "Unsupported arch!"
%endif
SEH64_END_PROLOGUE
%ifdef RT_ARCH_X86
;
; No string instruction to help us here. Do a simple tight loop instead.
;
shr ecx, 3
jz .return_null
.again:
cmp [edi], eax
je .needle_check
.continue:
add edi, 8
dec ecx
jnz .again
jmp .return_null
; Check the needle 2nd dword, caller can do the rest.
.needle_check:
cmp edx, [edi + 4]
jne .continue
.return_edi:
mov eax, edi
%else ; RT_ARCH_AMD64
cmp ecx, 8
jb .return_null
.continue:
shr ecx, 3
repne scasq
jne .return_null
; check more of the needle if we can.
mov r11d, 8
shl ecx, 3
.needle_check:
cmp cbNeedle, r11d
je .return_edi
cmp ecx, r11d
jb .return_edi ; returns success here as we've might've lost stuff while shifting ecx around.
mov bTmp, [pvNeedle + r11]
cmp bTmp, [xDI + r11 - 8]
jne .continue
inc r11d
jmp .needle_check
.return_edi:
lea xAX, [xDI - 8]
%endif ; RT_ARCH_AMD64
.return:
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
pop edi
leave
%endif
ret
.return_null:
xor eax, eax
jmp .return
ENDPROC pgmR3DbgFixedMemScan8Wide8Step
;;
; Searches for a 4 byte needle in steps of 4.
;
; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
;
; @remarks ASSUMES pbHaystack is aligned at uAlign.
;
BEGINPROC pgmR3DbgFixedMemScan4Wide4Step
%ifdef ASM_CALL64_MSC
mov r10, rdi ; save it
mov rdi, rcx ; rdi=pbHaystack
mov ecx, edx ; rcx=cbHaystack
mov eax, [r8] ; *(uint32_t *)pvNeedle
%elifdef ASM_CALL64_GCC
xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
mov eax, [rdx] ; *(uint32_t *)pvNeedle
%elifdef RT_ARCH_X86
mov edx, edi ; save it
mov edi, [esp + 04h] ; pbHaystack
mov ecx, [esp + 08h] ; cbHaystack
mov eax, [esp + 0ch] ; pvNeedle
mov eax, [eax] ; *(uint32_t *)pvNeedle
%else
%error "Unsupported arch!"
%endif
SEH64_END_PROLOGUE
.continue:
cmp ecx, 4
jb .return_null
shr ecx, 2
repne scasd
jne .return_null
%ifdef RT_ARCH_AMD64
; check more of the needle if we can.
mov r11d, 4
.needle_check:
cmp cbNeedle, r11d
je .return_edi
cmp ecx, r11d ; don't bother converting ecx to bytes.
jb .return_edi
mov bTmp, [pvNeedle + r11]
cmp bTmp, [xDI + r11 - 4]
jne .continue
inc r11d
jmp .needle_check
%endif
.return_edi:
lea xAX, [xDI - 4]
.return:
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
.return_null:
xor eax, eax
jmp .return
ENDPROC pgmR3DbgFixedMemScan4Wide4Step
;;
; Searches for a 2 byte needle in steps of 2.
;
; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
;
; @remarks ASSUMES pbHaystack is aligned at uAlign.
;
BEGINPROC pgmR3DbgFixedMemScan2Wide2Step
%ifdef ASM_CALL64_MSC
mov r10, rdi ; save it
mov rdi, rcx ; rdi=pbHaystack
mov ecx, edx ; rcx=cbHaystack
mov ax, [r8] ; *(uint16_t *)pvNeedle
%elifdef ASM_CALL64_GCC
xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
mov ax, [rdx] ; *(uint16_t *)pvNeedle
%elifdef RT_ARCH_X86
mov edx, edi ; save it
mov edi, [esp + 04h] ; pbHaystack
mov ecx, [esp + 08h] ; cbHaystack
mov eax, [esp + 0ch] ; pvNeedle
mov ax, [eax] ; *(uint16_t *)pvNeedle
%else
%error "Unsupported arch!"
%endif
SEH64_END_PROLOGUE
.continue:
cmp ecx, 2
jb .return_null
shr ecx, 1
repne scasw
jne .return_null
%ifdef RT_ARCH_AMD64
; check more of the needle if we can.
mov r11d, 2
.needle_check:
cmp cbNeedle, r11d
je .return_edi
cmp ecx, r11d ; don't bother converting ecx to bytes.
jb .return_edi
mov bTmp, [pvNeedle + r11]
cmp bTmp, [xDI + r11 - 2]
jne .continue
inc r11d
jmp .needle_check
%endif
.return_edi:
lea xAX, [xDI - 2]
.return:
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
.return_null:
xor eax, eax
jmp .return
ENDPROC pgmR3DbgFixedMemScan2Wide2Step
;;
; Searches for a 1 byte needle in steps of 1.
;
; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
;
BEGINPROC pgmR3DbgFixedMemScan1Wide1Step
%ifdef ASM_CALL64_MSC
mov r10, rdi ; save it
mov rdi, rcx ; rdi=pbHaystack
mov ecx, edx ; rcx=cbHaystack
mov al, [r8] ; *(uint8_t *)pvNeedle
%elifdef ASM_CALL64_GCC
xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
mov al, [rdx] ; *(uint8_t *)pvNeedle
%elifdef RT_ARCH_X86
mov edx, edi ; save it
mov edi, [esp + 04h] ; pbHaystack
mov ecx, [esp + 08h] ; cbHaystack
mov eax, [esp + 0ch] ; pvNeedle
mov al, [eax] ; *(uint8_t *)pvNeedle
%else
%error "Unsupported arch!"
%endif
SEH64_END_PROLOGUE
cmp ecx, 1
jb .return_null
.continue:
repne scasb
jne .return_null
%ifdef RT_ARCH_AMD64
; check more of the needle if we can.
mov r11d, 1
.needle_check:
cmp cbNeedle, r11d
je .return_edi
cmp ecx, r11d
jb .return_edi
mov bTmp, [pvNeedle + r11]
cmp bTmp, [xDI + r11 - 1]
jne .continue
inc r11d
jmp .needle_check
%endif
.return_edi:
lea xAX, [xDI - 1]
.return:
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
.return_null:
xor eax, eax
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
ENDPROC pgmR3DbgFixedMemScan1Wide1Step
;;
; Searches for a 4 byte needle in steps of 1.
;
; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
;
BEGINPROC pgmR3DbgFixedMemScan4Wide1Step
%ifdef ASM_CALL64_MSC
mov r10, rdi ; save it
mov rdi, rcx ; rdi=pbHaystack
mov ecx, edx ; rcx=cbHaystack
mov eax, [r8] ; *(uint32_t *)pvNeedle
%elifdef ASM_CALL64_GCC
xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
mov eax, [rdx] ; *(uint32_t *)pvNeedle
%elifdef RT_ARCH_X86
mov edx, edi ; save it
mov edi, [esp + 04h] ; pbHaystack
mov ecx, [esp + 08h] ; cbHaystack
mov eax, [esp + 0ch] ; pvNeedle
mov eax, [eax] ; *(uint32_t *)pvNeedle
%else
%error "Unsupported arch!"
%endif
SEH64_END_PROLOGUE
cmp ecx, 1
jb .return_null
.continue:
repne scasb
jne .return_null
cmp ecx, 3
jb .return_null
cmp eax, [xDI - 1]
jne .continue
.return_edi:
lea xAX, [xDI - 1]
.return:
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
.return_null:
xor eax, eax
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
ENDPROC pgmR3DbgFixedMemScan4Wide1Step
;;
; Searches for a 8 byte needle in steps of 1.
;
; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
;
; @remarks The 32-bit version is currently identical to pgmR3DbgFixedMemScan4Wide1Step.
;
BEGINPROC pgmR3DbgFixedMemScan8Wide1Step
%ifdef ASM_CALL64_MSC
mov r10, rdi ; save it
mov rdi, rcx ; rdi=pbHaystack
mov ecx, edx ; rcx=cbHaystack
mov rax, [r8] ; *(uint64_t *)pvNeedle
%elifdef ASM_CALL64_GCC
xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
mov rax, [rdx] ; *(uint64_t *)pvNeedle
%elifdef RT_ARCH_X86
mov edx, edi ; save it
mov edi, [esp + 04h] ; pbHaystack
mov ecx, [esp + 08h] ; cbHaystack
mov eax, [esp + 0ch] ; pvNeedle
mov eax, [eax] ; *(uint32_t *)pvNeedle
%else
%error "Unsupported arch!"
%endif
SEH64_END_PROLOGUE
cmp ecx, 1
jb .return_null
.continue:
repne scasb
jne .return_null
%ifdef RT_ARCH_AMD64
cmp ecx, 7
jb .check_smaller
cmp rax, [xDI - 1]
jne .continue
jmp .return_edi
.check_smaller:
%endif
cmp ecx, 3
jb .return_null
cmp eax, [xDI - 1]
jne .continue
.return_edi:
lea xAX, [xDI - 1]
.return:
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
.return_null:
xor eax, eax
%ifdef ASM_CALL64_MSC
mov rdi, r10
%elifdef RT_ARCH_X86
mov edi, edx
%endif
ret
ENDPROC pgmR3DbgFixedMemScan8Wide1Step
|
