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[CRT] Add CFI annotatiions to memmove function

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This commit is contained in:
Jérôme Gardou 2021-03-09 19:41:15 +01:00
parent 6a31fe6ca7
commit 0c34c067c4
1 changed files with 28 additions and 13 deletions
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41
sdk/lib/crt/mem/i386/memmove_asm.s
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@ -14,15 +14,20 @@ _memcpy:
FUNC _memmove
FPO 0, 3, 5, 2, 1, FRAME_NONFPO
push ebp
CFI_ADJUST_CFA_OFFSET 4
CFI_REL_OFFSET ebp, 0
mov ebp, esp
CFI_DEF_CFA_REGISTER ebp
push esi
CFI_REL_OFFSET esi, -4
push edi
CFI_REL_OFFSET edi, -8
mov edi, [ebp + 8]
mov esi, [ebp + 12]
mov ecx, [ebp + 16]
cmp edi, esi
jbe .CopyUp
mov eax, ecx
@ -30,9 +35,9 @@ FUNC _memmove
cmp edi, eax
jb .CopyDown
.CopyUp:
.CopyUp:
cld
cmp ecx, 16
jb .L1
mov edx, ecx
@ -53,29 +58,34 @@ FUNC _memmove
rep movsd
mov ecx, edx
and ecx, 3
.L1:
.L1:
test ecx, ecx
je .L3
rep movsb
.L3:
mov eax, [ebp + 8]
pop edi
CFI_SAME_VALUE edi
pop esi
CFI_SAME_VALUE esi
leave
CFI_ADJUST_CFA_OFFSET -4
CFI_SAME_VALUE ebp
CFI_DEF_CFA_REGISTER esp
ret
.CopyDown:
std
add edi, ecx
add esi, ecx
cmp ecx, 16
jb .L4
mov edx, ecx
test edi, 3
je .L5
/*
* Make the destination dword aligned
*/
@ -86,10 +96,10 @@ FUNC _memmove
dec edi
rep movsb
mov ecx, edx
sub esi, 3
sub edi, 3
.L6:
.L6:
shr ecx, 2
rep movsd
mov ecx, edx
@ -97,14 +107,19 @@ FUNC _memmove
je .L7
add esi, 3
add edi, 3
.L8:
.L8:
rep movsb
.L7:
cld
mov eax, [ebp + 8]
pop edi
CFI_SAME_VALUE edi
pop esi
CFI_SAME_VALUE esi
leave
CFI_ADJUST_CFA_OFFSET -4
CFI_SAME_VALUE ebp
CFI_DEF_CFA_REGISTER esp
ret
.L5:
sub edi, 4
@ -113,7 +128,7 @@ FUNC _memmove
.L4:
test ecx, ecx
je .L7
je .L7
dec esi
dec edi
jmp .L8