| 0,0 → 1,58 |
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| /* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */ |
| /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */ |
| /* Modified by SET to copy in reverse order */ |
| # This routine moves %ecx bytes from %ds:%esi to %es:%edi. It clobbers |
| # %eax, %ecx, %esi, %edi, and eflags. |
| #include <libc/asmdefs.h> |
| #include<libc/asm.h> |
| |
| .file "djmdr.s" |
| .text |
| .balign 16,,7 |
| MK_C_SYM(__dj_movedata_rev) |
| std |
| # Add the counter to the index |
| addl %ecx,%edi |
| addl %ecx,%esi |
| decl %esi |
| decl %edi |
| |
| cmpl $15,%ecx |
| jle small_move |
| jmp mod_4_check |
| |
| # Transfer bytes until either %esi or %edi is aligned % 3 |
| align_mod_4: |
| movsb |
| decl %ecx |
| mod_4_check: |
| movl %esi,%eax |
| andl $3,%eax |
| cmpl $3,%eax |
| jz big_move |
| movl %edi,%eax |
| andl $3,%eax |
| cmpl $3,%eax |
| jnz align_mod_4 |
| |
| big_move: |
| movb %cl,%al # We will store leftover count in %al |
| shrl $2,%ecx |
| andb $3,%al |
| # Now retrocess the index 3 positions |
| subl $3,%edi |
| subl $3,%esi |
| rep |
| movsl |
| |
| # %ecx known to be zero here, so insert the leftover count in %al |
| movb %al,%cl |
| |
| # advance the index by 3 |
| addl $3,%edi |
| addl $3,%esi |
| |
| small_move: |
| rep |
| movsb |
| ret |
| Property changes: |
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| Added: svn:executable |
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| +* |
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| \ No newline at end of property |
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