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generic sys_fork / sys_vfork / sys_clone

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... and get rid of idiotic struct pt_regs * in asm-generic/syscalls.h
prototypes of the same, while we are at it.  Eventually we want those
in linux/syscalls.h, of course, but that'll have to wait a bit.

Note that there are *three* variants of sys_clone() order of arguments.
Braindamage galore...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-23 13:17:59 -04:00
parent 25906730ec
commit d2125043ae
3 changed files with 60 additions and 4 deletions
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14
arch/Kconfig
View File

@ -341,4 +341,18 @@ config MODULES_USE_ELF_REL
Modules only use ELF REL relocations. Modules with ELF RELA
relocations will give an error.
#
# ABI hall of shame
#
config CLONE_BACKWARDS
bool
help
Architecture has tls passed as the 4th argument of clone(2),
not the 5th one.
config CLONE_BACKWARDS2
bool
help
Architecture has the first two arguments of clone(2) swapped.
source "kernel/gcov/Kconfig"

7
include/asm-generic/syscalls.h
View File

@ -10,16 +10,15 @@
*/
#ifndef sys_clone
asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
void __user *parent_tid, void __user *child_tid,
struct pt_regs *regs);
void __user *parent_tid, void __user *child_tid);
#endif
#ifndef sys_fork
asmlinkage long sys_fork(struct pt_regs *regs);
asmlinkage long sys_fork(void);
#endif
#ifndef sys_vfork
asmlinkage long sys_vfork(struct pt_regs *regs);
asmlinkage long sys_vfork(void);
#endif
#ifndef sys_execve

43
kernel/fork.c
View File

@ -1645,6 +1645,49 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
}
#endif
#ifdef __ARCH_WANT_SYS_FORK
SYSCALL_DEFINE0(fork)
{
#ifdef CONFIG_MMU
return do_fork(SIGCHLD, 0, current_pt_regs(), 0, NULL, NULL);
#else
/* can not support in nommu mode */
return(-EINVAL);
#endif
}
#endif
#ifdef __ARCH_WANT_SYS_VFORK
SYSCALL_DEFINE0(vfork)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, current_pt_regs(),
0, NULL, NULL);
}
#endif
#ifdef __ARCH_WANT_SYS_CLONE
#ifdef CONFIG_CLONE_BACKWARDS
SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
int __user *, parent_tidptr,
int, tls_val,
int __user *, child_tidptr)
#elif defined(CONFIG_CLONE_BACKWARDS2)
SYSCALL_DEFINE5(clone, unsigned long, newsp, unsigned long, clone_flags,
int __user *, parent_tidptr,
int __user *, child_tidptr,
int, tls_val)
#else
SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
int __user *, parent_tidptr,
int __user *, child_tidptr,
int, tls_val)
#endif
{
return do_fork(clone_flags, newsp, current_pt_regs(), 0,
parent_tidptr, child_tidptr);
}
#endif
#ifndef ARCH_MIN_MMSTRUCT_ALIGN
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif