Commit 951b3961 authored by Al Viro's avatar Al Viro
Browse files

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



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 24465a40

arch/c6x/include/asm/syscalls.h

+0 −4
Original line number Diff line number Diff line
@@ -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 */

arch/c6x/include/uapi/asm/unistd.h

+1 −0
Original line number Diff line number Diff line
@@ -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>

arch/c6x/kernel/entry.S

+0 −12
Original line number Diff line number Diff line
@@ -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

arch/c6x/kernel/process.c

+5 −20
Original line number Diff line number Diff line
@@ -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);
@@ -170,7 +154,8 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, 
		childregs->a1 = ustk_size;	/* argument */

	} else {

		/* Otherwise use the given stack */

		*childregs = *regs;

		*childregs = *current_pt_regs();

		if (usp)

			childregs->sp = usp;

		p->thread.pc = (unsigned long) ret_from_fork;

	}

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