Al Viro | 37185b3 | 2012-10-08 03:27:32 +0100 | [diff] [blame] | 1 | #include <as-layout.h> |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 2 | |
Amerigo Wang | 276c974 | 2009-06-16 15:33:30 -0700 | [diff] [blame] | 3 | .section .__syscall_stub, "ax" |
Jeff Dike | c560049 | 2005-09-03 15:57:36 -0700 | [diff] [blame] | 4 | |
| 5 | .globl batch_syscall_stub |
| 6 | batch_syscall_stub: |
Bodo Stroesser | 07bf731 | 2005-09-03 15:57:50 -0700 | [diff] [blame] | 7 | /* load pointer to first operation */ |
Jeff Dike | 4bdf8bc | 2008-02-04 22:30:44 -0800 | [diff] [blame] | 8 | mov $(STUB_DATA+8), %esp |
Bodo Stroesser | 07bf731 | 2005-09-03 15:57:50 -0700 | [diff] [blame] | 9 | |
| 10 | again: |
| 11 | /* load length of additional data */ |
| 12 | mov 0x0(%esp), %eax |
| 13 | |
| 14 | /* if(length == 0) : end of list */ |
| 15 | /* write possible 0 to header */ |
Jeff Dike | 4bdf8bc | 2008-02-04 22:30:44 -0800 | [diff] [blame] | 16 | mov %eax, STUB_DATA+4 |
Jeff Dike | c560049 | 2005-09-03 15:57:36 -0700 | [diff] [blame] | 17 | cmpl $0, %eax |
| 18 | jz done |
Bodo Stroesser | 07bf731 | 2005-09-03 15:57:50 -0700 | [diff] [blame] | 19 | |
| 20 | /* save current pointer */ |
Jeff Dike | 4bdf8bc | 2008-02-04 22:30:44 -0800 | [diff] [blame] | 21 | mov %esp, STUB_DATA+4 |
Bodo Stroesser | 07bf731 | 2005-09-03 15:57:50 -0700 | [diff] [blame] | 22 | |
| 23 | /* skip additional data */ |
| 24 | add %eax, %esp |
| 25 | |
| 26 | /* load syscall-# */ |
| 27 | pop %eax |
| 28 | |
| 29 | /* load syscall params */ |
Jeff Dike | c560049 | 2005-09-03 15:57:36 -0700 | [diff] [blame] | 30 | pop %ebx |
| 31 | pop %ecx |
| 32 | pop %edx |
| 33 | pop %esi |
| 34 | pop %edi |
| 35 | pop %ebp |
Bodo Stroesser | 07bf731 | 2005-09-03 15:57:50 -0700 | [diff] [blame] | 36 | |
| 37 | /* execute syscall */ |
Jeff Dike | c560049 | 2005-09-03 15:57:36 -0700 | [diff] [blame] | 38 | int $0x80 |
Bodo Stroesser | 07bf731 | 2005-09-03 15:57:50 -0700 | [diff] [blame] | 39 | |
| 40 | /* check return value */ |
| 41 | pop %ebx |
| 42 | cmp %ebx, %eax |
| 43 | je again |
| 44 | |
| 45 | done: |
| 46 | /* save return value */ |
Jeff Dike | 4bdf8bc | 2008-02-04 22:30:44 -0800 | [diff] [blame] | 47 | mov %eax, STUB_DATA |
Bodo Stroesser | 07bf731 | 2005-09-03 15:57:50 -0700 | [diff] [blame] | 48 | |
| 49 | /* stop */ |
| 50 | int3 |