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Commit d2125043 authored by Al Viro's avatar Al Viro
Browse files

generic sys_fork / sys_vfork / sys_clone 



... 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: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 25906730

arch/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -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"

include/asm-generic/syscalls.h

+3 −4
Original line number Diff line number Diff line
@@ -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

kernel/fork.c

+43 −0
Original line number Diff line number Diff line
@@ -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