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comparison VPThread.s @ 5:f36e9ab2e030
separated asm singleton routines
| author | Merten Sach <msach@mailbox.tu-berlin.de> |
|---|---|
| date | Mon, 06 Jun 2011 18:30:00 +0200 |
| parents | |
| children | ce4ad44fcc23 |
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| -1:000000000000 | 0:a5baeb36202c |
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| 1 | |
| 2 //Assembly code takes the return addr off the stack and saves | |
| 3 // into the singleton. The first field in the singleton is the | |
| 4 // "endInstrAddr" field, and the return addr is at 0x4(%ebp) | |
| 5 .globl asm_save_ret_to_singleton | |
| 6 asm_save_ret_to_singleton: | |
| 7 movl 0x4(%ebp), %eax #get ret address, ebp is the same as in the calling function | |
| 8 movl 0x4(%esp), %edx #get argument(singletonPtrAddr) from stack | |
| 9 movl %eax, (%edx) #write ret addr to endInstrAddr field | |
| 10 ret | |
| 11 | |
| 12 | |
| 13 //Assembly code changes the return addr on the stack to the one | |
| 14 // saved into the singleton by the end-singleton-fn | |
| 15 //The stack's return addr is at 0x4(%%ebp) | |
| 16 .globl asm_write_ret_from_singleton | |
| 17 asm_write_ret_from_singleton: | |
| 18 movl 0x4(%esp), %edx #get singleton addr from stack | |
| 19 movl (%edx), %eax #get endInstrAddr field | |
| 20 movl %eax, 0x4(%ebp) #write return addr to the stack of the caller | |
| 21 ret | |
| 22 | |
| 23 |