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c6x: sanitize copy_thread(), get rid of clone(2) wrapper, switch to generic clone()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-21 16:37:49 -04:00
parent 24465a40ba
commit 951b39619a
4 changed files with 6 additions and 36 deletions
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4
arch/c6x/include/asm/syscalls.h
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@ -41,10 +41,6 @@ extern long sys_fallocate_c6x(int fd, int mode,
u32 len_lo, u32 len_hi);
extern int sys_cache_sync(unsigned long s, unsigned long e);
struct pt_regs;
extern asmlinkage long sys_c6x_clone(struct pt_regs *regs);
#include <asm-generic/syscalls.h>
#endif /* __ASM_C6X_SYSCALLS_H */

1
arch/c6x/include/uapi/asm/unistd.h
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@ -15,6 +15,7 @@
*/
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_CLONE
/* Use the standard ABI for syscalls. */
#include <asm-generic/unistd.h>

12
arch/c6x/kernel/entry.S
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@ -613,18 +613,6 @@ ENDPROC(sys_sigaltstack)
;; Special system calls
;; return address is in B3
;;
ENTRY(sys_clone)
ADD .D1X SP,8,A4
#ifdef CONFIG_C6X_BIG_KERNEL
|| MVKL .S1 sys_c6x_clone,A0
MVKH .S1 sys_c6x_clone,A0
BNOP .S2X A0,5
#else
|| B .S2 sys_c6x_clone
NOP 5
#endif
ENDPROC(sys_clone)
ENTRY(sys_rt_sigreturn)
ADD .D1X SP,8,A4
#ifdef CONFIG_C6X_BIG_KERNEL

25
arch/c6x/kernel/process.c
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@ -112,22 +112,6 @@ void exit_thread(void)
{
}
SYSCALL_DEFINE1(c6x_clone, struct pt_regs *, regs)
{
unsigned long clone_flags;
unsigned long newsp;
/* syscall puts clone_flags in A4 and usp in B4 */
clone_flags = regs->orig_a4;
if (regs->b4)
newsp = regs->b4;
else
newsp = regs->sp;
return do_fork(clone_flags, newsp, regs, 0, (int __user *)regs->a6,
(int __user *)regs->b6);
}
/*
* Do necessary setup to start up a newly executed thread.
*/
@ -155,13 +139,13 @@ void start_thread(struct pt_regs *regs, unsigned int pc, unsigned long usp)
*/
int copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long ustk_size,
struct task_struct *p, struct pt_regs *regs)
struct task_struct *p, struct pt_regs *unused)
{
struct pt_regs *childregs;
childregs = task_pt_regs(p);
if (!regs) {
if (unlikely(p->flags & PF_KTHREAD)) {
/* case of __kernel_thread: we return to supervisor space */
memset(childregs, 0, sizeof(struct pt_regs));
childregs->sp = (unsigned long)(childregs + 1);
@ -170,8 +154,9 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
childregs->a1 = ustk_size; /* argument */
} else {
/* Otherwise use the given stack */
*childregs = *regs;
childregs->sp = usp;
*childregs = *current_pt_regs();
if (usp)
childregs->sp = usp;
p->thread.pc = (unsigned long) ret_from_fork;
}