diff options
Diffstat (limited to 'usr/klibc/arch/i386/varsyscall.S')
| -rw-r--r-- | usr/klibc/arch/i386/varsyscall.S | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/usr/klibc/arch/i386/varsyscall.S b/usr/klibc/arch/i386/varsyscall.S new file mode 100644 index 0000000..e796a93 --- /dev/null +++ b/usr/klibc/arch/i386/varsyscall.S @@ -0,0 +1,37 @@ +/* + * arch/i386/varsyscall.S + * + * Common tail-handling code for varadic system calls (which always + * use the cdecl convention.) + * + * The arguments are on the stack; the system call number in %eax. + */ + +#ifdef _REGPARM + +#define ARG(n) (4*n+24)(%esp) +#define SYSNO ARG(-2) + + .text + .align 4 + .globl __syscall_varadic + .type __syscall_varadic,@function +__syscall_varadic: + pushl %ebx + pushl %esi + pushl %edi + pushl %ebp + + movl SYSNO,%eax + movl ARG(0),%ebx # Syscall arguments + movl ARG(1),%ecx + movl ARG(2),%edx + movl ARG(3),%esi + movl ARG(4),%edi + movl ARG(5),%ebp + + jmp __syscall_common_tail + + .size __syscall_varadic,.-__syscall_varadic + +#endif |