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115 lines
1.3 KiB
ArmAsm
115 lines
1.3 KiB
ArmAsm
/*
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* void *memmove (void *to, const void *from, size_t count)
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*
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* NOTE: This code is duplicated in memcpy_asm.s
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*/
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.globl _memmove
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_memmove:
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push %ebp
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mov %esp,%ebp
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push %esi
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push %edi
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mov 8(%ebp),%edi
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mov 12(%ebp),%esi
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mov 16(%ebp),%ecx
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cmp %esi,%edi
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jbe .CopyUp
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mov %ecx,%eax
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add %esi,%eax
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cmp %eax,%edi
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jb .CopyDown
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.CopyUp:
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cld
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cmp $16,%ecx
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jb .L1
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mov %ecx,%edx
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test $3,%edi
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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 %edi,%ecx
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and $3,%ecx
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sub $5,%ecx
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not %ecx
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sub %ecx,%edx
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rep movsb
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mov %edx,%ecx
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.L2:
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shr $2,%ecx
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rep movsl
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mov %edx,%ecx
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and $3,%ecx
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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 8(%ebp),%eax
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pop %edi
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pop %esi
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leave
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ret
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.CopyDown:
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std
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add %ecx,%edi
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add %ecx,%esi
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cmp $16,%ecx
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jb .L4
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mov %ecx,%edx
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test $3,%edi
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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 %edi,%ecx
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and $3,%ecx
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sub %ecx,%edx
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dec %esi
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dec %edi
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rep movsb
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mov %edx,%ecx
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sub $3,%esi
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sub $3,%edi
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.L6:
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shr $2,%ecx
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rep movsl
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mov %edx,%ecx
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and $3,%ecx
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je .L7
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add $3,%esi
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add $3,%edi
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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 8(%ebp),%eax
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pop %edi
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pop %esi
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leave
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ret
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.L5:
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sub $4,%edi
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sub $4,%esi
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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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