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138 lines
1.6 KiB
ArmAsm
138 lines
1.6 KiB
ArmAsm
/*
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* void *memcpy (void *to, const void *from, size_t count)
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*
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*/
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#include <asm.inc>
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#include <ks386.inc>
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PUBLIC _memcpy
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PUBLIC _memmove
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.code
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_memcpy:
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FUNC _memmove
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FPO 0, 3, 5, 2, 1, FRAME_NONFPO
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push ebp
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CFI_ADJUST_CFA_OFFSET 4
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CFI_REL_OFFSET ebp, 0
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mov ebp, esp
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CFI_DEF_CFA_REGISTER ebp
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push esi
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CFI_REL_OFFSET esi, -4
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push edi
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CFI_REL_OFFSET edi, -8
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mov edi, [ebp + 8]
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mov esi, [ebp + 12]
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mov ecx, [ebp + 16]
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cmp edi, esi
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jbe .CopyUp
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mov eax, ecx
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add eax, esi
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cmp edi, eax
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jb .CopyDown
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.CopyUp:
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cld
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cmp ecx, 16
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jb .L1
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mov edx, ecx
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test edi, 3
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je .L2
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/*
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* Make the destination dword aligned
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*/
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mov ecx, edi
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and ecx, 3
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sub ecx, 5
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not ecx
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sub edx, ecx
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rep movsb
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mov ecx, edx
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.L2:
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shr ecx, 2
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rep movsd
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mov ecx, edx
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and ecx, 3
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.L1:
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test ecx, ecx
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je .L3
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rep movsb
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.L3:
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mov eax, [ebp + 8]
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pop edi
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CFI_SAME_VALUE edi
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pop esi
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CFI_SAME_VALUE esi
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leave
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CFI_ADJUST_CFA_OFFSET -4
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CFI_SAME_VALUE ebp
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CFI_DEF_CFA_REGISTER esp
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ret
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.CopyDown:
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std
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add edi, ecx
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add esi, ecx
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cmp ecx, 16
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jb .L4
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mov edx, ecx
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test edi, 3
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je .L5
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/*
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* Make the destination dword aligned
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*/
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mov ecx, edi
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and ecx, 3
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sub edx, ecx
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dec esi
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dec edi
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rep movsb
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mov ecx, edx
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sub esi, 3
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sub edi, 3
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.L6:
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shr ecx, 2
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rep movsd
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mov ecx, edx
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and ecx, 3
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je .L7
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add esi, 3
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add edi, 3
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.L8:
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rep movsb
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.L7:
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cld
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mov eax, [ebp + 8]
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pop edi
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CFI_SAME_VALUE edi
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pop esi
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CFI_SAME_VALUE esi
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leave
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CFI_ADJUST_CFA_OFFSET -4
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CFI_SAME_VALUE ebp
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CFI_DEF_CFA_REGISTER esp
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ret
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.L5:
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sub edi, 4
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sub esi, 4
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jmp .L6
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.L4:
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test ecx, ecx
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je .L7
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dec esi
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dec edi
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jmp .L8
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ENDFUNC
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END
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