Contents of /trunk/mkinitrd-magellan/klibc/usr/klibc/arch/i386/syscall.S
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Revision 815 -
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Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
File size: 1069 byte(s)
Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
File size: 1069 byte(s)
-updated to klibc-1.5.15
1 | /* |
2 | * arch/i386/syscall.S |
3 | * |
4 | * Common tail-handling code for system calls. |
5 | * |
6 | * The arguments are on the stack; the system call number in %eax. |
7 | */ |
8 | |
9 | #define ARG(n) (4*(n)+24)(%esp) |
10 | #define SYSNO ARG(-2) |
11 | |
12 | .text |
13 | .align 4 |
14 | .globl __syscall_common |
15 | .type __syscall_common,@function |
16 | __syscall_common: |
17 | pushl %ebx |
18 | pushl %esi |
19 | pushl %edi |
20 | pushl %ebp |
21 | |
22 | #ifdef _REGPARM |
23 | xchgl %ecx,%edx |
24 | movl %eax,%ebx |
25 | movl SYSNO,%eax |
26 | movl ARG(0),%esi |
27 | movl ARG(1),%edi |
28 | movl ARG(2),%ebp |
29 | #else |
30 | movl SYSNO,%eax |
31 | movl ARG(0),%ebx # Syscall arguments |
32 | movl ARG(1),%ecx |
33 | movl ARG(2),%edx |
34 | movl ARG(3),%esi |
35 | movl ARG(4),%edi |
36 | movl ARG(5),%ebp |
37 | #endif |
38 | .globl __syscall_common_tail |
39 | __syscall_common_tail: |
40 | int $0x80 |
41 | |
42 | cmpl $-4095,%eax |
43 | |
44 | popl %ebp |
45 | popl %edi |
46 | popl %esi |
47 | popl %ebx |
48 | popl %edx # Drop system call number |
49 | |
50 | jb 1f |
51 | |
52 | # Error return, must set errno |
53 | negl %eax |
54 | movl %eax,errno |
55 | orl $-1,%eax # Return -1 |
56 | |
57 | 1: |
58 | ret |
59 | |
60 | .size __syscall_common,.-__syscall_common |
61 | |
62 | #ifndef _REGPARM |
63 | |
64 | .globl __syscall_varadic |
65 | .type __syscall_varadic,@function |
66 | __syscall_varadic = __syscall_common |
67 | |
68 | #endif |