76 lines
1.0 KiB
NASM
76 lines
1.0 KiB
NASM
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section .text
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global memcpy
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memcpy:
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push esi
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push edi
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mov eax, dword [esp+12]
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mov edi, eax
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mov esi, dword [esp+16]
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mov ecx, dword [esp+20]
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rep movsb
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pop edi
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pop esi
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ret
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global memset
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memset:
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push edi
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mov edx, dword [esp+8]
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mov edi, edx
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mov eax, dword [esp+12]
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mov ecx, dword [esp+16]
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rep stosb
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mov eax, edx
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pop edi
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ret
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global memmove
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memmove:
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push esi
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push edi
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mov eax, dword [esp+12]
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mov edi, eax
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mov esi, dword [esp+16]
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mov ecx, dword [esp+20]
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cmp edi, esi
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ja .copy_backwards
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rep movsb
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jmp .done
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.copy_backwards:
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lea edi, [edi+ecx-1]
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lea esi, [esi+ecx-1]
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std
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rep movsb
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cld
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.done:
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pop edi
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pop esi
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ret
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global memcmp
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memcmp:
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push esi
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push edi
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mov edi, dword [esp+12]
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mov esi, dword [esp+16]
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mov ecx, dword [esp+20]
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repe cmpsb
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je .equal
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mov al, byte [edi-1]
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sub al, byte [esi-1]
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movsx eax, al
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jmp .done
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.equal:
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xor eax, eax
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.done:
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pop edi
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pop esi
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ret
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