Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1882 | clevermous | 1 | /* Copyright (C) 1999 DJ Delorie, see COPYING.DJ for details */ |
| 2 | /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */ |
||
| 3 | # This routine moves %ecx bytes from %ds:%esi to %es:%edi. It clobbers |
||
| 4 | # %eax, %ecx, %esi, %edi, and eflags. The memory ranges must not overlap, |
||
| 5 | # unless %esi >= %edi. |
||
| 6 | #include |
||
| 7 | #include |
||
| 8 | |||
| 9 | .file "djmd.s" |
||
| 10 | .text |
||
| 11 | .balign 16,,7 |
||
| 12 | |||
| 13 | MK_C_SYM(__dj_movedata) |
||
| 14 | cmpl $15,%ecx |
||
| 15 | jle small_move |
||
| 16 | jmp mod_4_check |
||
| 17 | |||
| 18 | # Transfer bytes until either %esi or %edi is aligned % 4 |
||
| 19 | align_mod_4: |
||
| 20 | movsb |
||
| 21 | decl %ecx |
||
| 22 | mod_4_check: |
||
| 23 | testl $3,%esi |
||
| 24 | jz big_move |
||
| 25 | testl $3,%edi |
||
| 26 | jnz align_mod_4 |
||
| 27 | |||
| 28 | big_move: |
||
| 29 | movb %cl,%al # We will store leftover count in %al |
||
| 30 | shrl $2,%ecx |
||
| 31 | andb $3,%al |
||
| 32 | rep |
||
| 33 | movsl |
||
| 34 | |||
| 35 | # %ecx known to be zero here, so insert the leftover count in %al |
||
| 36 | movb %al,%cl |
||
| 37 | small_move: |
||
| 38 | rep |
||
| 39 | movsb |
||
| 40 | ret |