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