diff options
| author | Bruce Beare <brucex.j.beare@intel.com> | 2010-03-04 10:29:38 -0800 |
|---|---|---|
| committer | Bruce Beare <brucex.j.beare@intel.com> | 2010-03-04 10:29:38 -0800 |
| commit | 3c543e1da9a2780a70b25299f39734bf0a18c4a0 (patch) | |
| tree | 07780890d546321d9426758f629f5a951b5a2eeb /libc/arch-x86 | |
| parent | 58060c50bc4228a7d0253338cae0437211759959 (diff) | |
| download | bionic-3c543e1da9a2780a70b25299f39734bf0a18c4a0.zip bionic-3c543e1da9a2780a70b25299f39734bf0a18c4a0.tar.gz bionic-3c543e1da9a2780a70b25299f39734bf0a18c4a0.tar.bz2 | |
x86 syscall system call implementation
Diffstat (limited to 'libc/arch-x86')
| -rw-r--r-- | libc/arch-x86/bionic/syscall.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/libc/arch-x86/bionic/syscall.S b/libc/arch-x86/bionic/syscall.S new file mode 100644 index 0000000..71abe6b --- /dev/null +++ b/libc/arch-x86/bionic/syscall.S @@ -0,0 +1,52 @@ +/* + * Generic syscall call. + * Upon entry + * %eax: system call number + * %ebx: arg0 to system call + * %ecx: arg.. + * %edx: arg.. + * %esi: arg.. + * %edi: arg.. + * We push these (to save them) load them up with the + * values from the calling frame (not all will actually be valid) + * and make the syscall. + */ + +#include <sys/linux-syscalls.h> + + .text + .type syscall, @function + .globl syscall + .align 4 + +syscall: + push %eax + push %ebx + push %ecx + push %edx + push %esi + push %edi + mov 28(%esp),%eax + mov 32(%esp),%ebx + mov 36(%esp),%ecx + mov 40(%esp),%edx + mov 44(%esp),%esi + mov 48(%esp),%edi + + int $0x80 + + cmpl $-129, %eax + jb 1f + negl %eax + pushl %eax + call __set_errno + addl $4, %esp + orl $-1, %eax +1: + pop %edi + pop %esi + pop %edx + pop %ecx + pop %ebx + pop %eax + ret |