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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2018-03-27 21:23:52 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2018-03-27 21:28:58 -0300 |
| commit | d39c0a459ef32a41daac4840859bf304d931adab (patch) | |
| tree | c6e589a49857e4ba6ebe985a0a543802d55e1e4a /sysdeps | |
| parent | cc8a1620eb97ccddd337d157263c13c57b39ab71 (diff) | |
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sparc: Fix arch_fork definition
This patch fixes 3dc214977 for sparc. Different than other architectures
SPARC kernel Kconfig does not define CONFIG_CLONE_BACKWARDS, however it
has the same ABI as if it did, implemented by sparc-specific code
(sparc_do_fork).
It also has a unique return value convention for clone:
Parent --> %o0 == child's pid, %o1 == 0
Child --> %o0 == parent's pid, %o1 == 1
Which required a special macro to correct issue the syscall
(INLINE_CLONE_SYSCALL).
Checked on sparc64-linux-gnu and sparcv9-linux-gnu.
* sysdeps/unix/sysv/linux/arch-fork.h [__ASSUME_CLONE_BACKWARDS]
(arch_fork): Issue INLINE_CLONE_SYSCALL if defined.
* sysdeps/unix/sysv/linux/sparc/kernel-features.h
(__ASSUME_CLONE_BACKWARDS): Define.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/arch-fork.h | 4 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/sparc/kernel-features.h | 14 |
2 files changed, 18 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/arch-fork.h b/sysdeps/unix/sysv/linux/arch-fork.h index 3daa9651e5..046d9fc60d 100644 --- a/sysdeps/unix/sysv/linux/arch-fork.h +++ b/sysdeps/unix/sysv/linux/arch-fork.h @@ -34,7 +34,11 @@ arch_fork (void *ctid) const int flags = CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID | SIGCHLD; long int ret; #ifdef __ASSUME_CLONE_BACKWARDS +# ifdef INLINE_CLONE_SYSCALL + ret = INLINE_CLONE_SYSCALL (flags, 0, NULL, 0, ctid); +# else ret = INLINE_SYSCALL_CALL (clone, flags, 0, NULL, 0, ctid); +# endif #elif defined(__ASSUME_CLONE_BACKWARDS2) ret = INLINE_SYSCALL_CALL (clone, 0, flags, NULL, ctid, 0); #elif defined(__ASSUME_CLONE_BACKWARDS3) diff --git a/sysdeps/unix/sysv/linux/sparc/kernel-features.h b/sysdeps/unix/sysv/linux/sparc/kernel-features.h index 2fd12cb7ce..64d714036e 100644 --- a/sysdeps/unix/sysv/linux/sparc/kernel-features.h +++ b/sysdeps/unix/sysv/linux/sparc/kernel-features.h @@ -40,3 +40,17 @@ /* sparc only supports ipc syscall. */ #undef __ASSUME_DIRECT_SYSVIPC_SYSCALLS + +/* SPARC kernel Kconfig does not define CONFIG_CLONE_BACKWARDS, however it + has the same ABI as if it did, implemented by sparc-specific code + (sparc_do_fork). + + It also has a unique return value convention: + + Parent --> %o0 == child's pid, %o1 == 0 + Child --> %o0 == parent's pid, %o1 == 1 + + Which required a special macro to correct issue the syscall + (INLINE_CLONE_SYSCALL). */ +#undef __ASSUME_CLONE_DEFAULT +#define __ASSUME_CLONE_BACKWARDS 1 |