diff options
| author | Markos Chandras <markos.chandras@imgtec.com> | 2010-11-18 14:58:01 +0000 |
|---|---|---|
| committer | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2013-03-14 22:47:08 +0100 |
| commit | daecc9a410a6f23d80daf8ce3afd280fea329e63 (patch) | |
| tree | 8d603dd538809431cc01b9e656c827d1f0709052 /libc/sysdeps/linux/metag/vfork.S | |
| parent | 20221281b3d67880439cd1d16c151f4528d034fb (diff) | |
metag: Add NPTL support
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/metag/vfork.S')
| -rw-r--r-- | libc/sysdeps/linux/metag/vfork.S | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/metag/vfork.S b/libc/sysdeps/linux/metag/vfork.S new file mode 100644 index 000000000..8573dedd3 --- /dev/null +++ b/libc/sysdeps/linux/metag/vfork.S @@ -0,0 +1,67 @@ +! Copyright (C) 2013 Imagination Technologies Ltd. + +! Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + +#include <asm/unistd.h> + +#define _ERRNO_H +#include <bits/errno.h> +#include <sys/syscall.h> + +#ifndef SAVE_PID +#define SAVE_PID +#endif + +#ifndef RESTORE_PID +#define RESTORE_PID +#endif + +#ifdef __NR_vfork +#define __VFORK_NR __NR_vfork +#else +#define __VFORK_NR __NR_fork +#endif + +/* Clone the calling process, but without copying the whole address space. + The calling process is suspended until the new process exits or is + replaced by a call to `execve'. Return -1 for errors, 0 to the new process, + and the process ID of the new process to the old process. */ + + .balign 4 + .global ___vfork + .hidden ___vfork + .type ___vfork, @function +___vfork: + + SAVE_PID + + MOV D1Ar1, #0x4111 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ + MOV D0Ar2, #0 + MOV D1Ar3, #0 + MOV D0Ar4, #0 + MOV D1Ar5, #0 + MOV D0Ar6, #0 + MOV D1Re0, #__NR_clone + SWITCH #0x440001 + + RESTORE_PID + + MOVT D1Re0, #HI(-4096) + ADD D1Re0, D1Re0, #LO(-4096) + CMP D1Re0, D0Re0 + BCS error + + /* Syscall worked. Return to child/parent */ + MOV PC, D1RtP + +error: + MOV D1Ar1, D0Re0 +#ifdef __PIC__ + B ___syscall_error@PLT +#else + B ___syscall_error +#endif + .size ___vfork,.-___vfork + +weak_alias(__vfork,vfork) +libc_hidden_weak(vfork) |