projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 79e1dd05 AV |
1 | /* |
| 2 | * This program is free software; you can redistribute it and/or | |
| 3 | * modify it under the terms of the GNU General Public License | |
| 4 | * as published by the Free Software Foundation; version 2 | |
| 5 | * of the License. | |
| 6 | * | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/linkage.h> | |
| 79e1dd05 AV |
10 | #include <asm/dwarf2.h> |
| 11 | ||
| 79e1dd05 AV |
12 | .text |
| 13 | ||
| 14 | /* | |
| 15 | * Inputs: | |
| 16 | * %esi : memory location to compare | |
| 17 | * %eax : low 32 bits of old value | |
| 18 | * %edx : high 32 bits of old value | |
| 19 | * %ebx : low 32 bits of new value | |
| 20 | * %ecx : high 32 bits of new value | |
| 21 | */ | |
| 22 | ENTRY(cmpxchg8b_emu) | |
| 23 | CFI_STARTPROC | |
| 24 | ||
| 25 | # | |
| 26 | # Emulate 'cmpxchg8b (%esi)' on UP except we don't | |
| 27 | # set the whole ZF thing (caller will just compare | |
| 28 | # eax:edx with the expected value) | |
| 29 | # | |
| 5f1d919a | 30 | pushfl_cfi |
| 79e1dd05 AV |
31 | cli |
| 32 | ||
| 33 | cmpl (%esi), %eax | |
| 5f1d919a | 34 | jne .Lnot_same |
| 79e1dd05 | 35 | cmpl 4(%esi), %edx |
| 5f1d919a | 36 | jne .Lhalf_same |
| 79e1dd05 AV |
37 | |
| 38 | movl %ebx, (%esi) | |
| 39 | movl %ecx, 4(%esi) | |
| 40 | ||
| 5f1d919a JB |
41 | CFI_REMEMBER_STATE |
| 42 | popfl_cfi | |
| 79e1dd05 AV |
43 | ret |
| 44 | ||
| 5f1d919a JB |
45 | CFI_RESTORE_STATE |
| 46 | .Lnot_same: | |
| 79e1dd05 | 47 | movl (%esi), %eax |
| 5f1d919a | 48 | .Lhalf_same: |
| 79e1dd05 AV |
49 | movl 4(%esi), %edx |
| 50 | ||
| 5f1d919a | 51 | popfl_cfi |
| 79e1dd05 AV |
52 | ret |
| 53 | ||
| 54 | CFI_ENDPROC | |
| 55 | ENDPROC(cmpxchg8b_emu) |