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ARC: wireup clone3 syscall

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Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2020-01-15 16:08:12 -08:00
parent 7980dff398
commit bd71c453db
6 changed files with 19 additions and 4 deletions
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1
arch/arc/Kconfig
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@ -28,6 +28,7 @@ config ARC
select GENERIC_SMP_IDLE_THREAD
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select HAVE_COPY_THREAD_TLS
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_DEBUG_KMEMLEAK
select HAVE_FUTEX_CMPXCHG if FUTEX

1
arch/arc/include/asm/syscalls.h
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@ -11,6 +11,7 @@
#include <linux/types.h>
int sys_clone_wrapper(int, int, int, int, int);
int sys_clone3_wrapper(void *, size_t);
int sys_cacheflush(uint32_t, uint32_t uint32_t);
int sys_arc_settls(void *);
int sys_arc_gettls(void);

1
arch/arc/include/uapi/asm/unistd.h
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@ -21,6 +21,7 @@
#define __ARCH_WANT_SET_GET_RLIMIT
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_CLONE
#define __ARCH_WANT_SYS_CLONE3
#define __ARCH_WANT_SYS_VFORK
#define __ARCH_WANT_SYS_FORK
#define __ARCH_WANT_TIME32_SYSCALLS

12
arch/arc/kernel/entry.S
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@ -35,6 +35,18 @@ ENTRY(sys_clone_wrapper)
b .Lret_from_system_call
END(sys_clone_wrapper)
ENTRY(sys_clone3_wrapper)
SAVE_CALLEE_SAVED_USER
bl @sys_clone3
DISCARD_CALLEE_SAVED_USER
GET_CURR_THR_INFO_FLAGS r10
btst r10, TIF_SYSCALL_TRACE
bnz tracesys_exit
b .Lret_from_system_call
END(sys_clone3_wrapper)
ENTRY(ret_from_fork)
; when the forked child comes here from the __switch_to function
; r0 has the last task pointer.

7
arch/arc/kernel/process.c
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@ -171,9 +171,8 @@ asmlinkage void ret_from_fork(void);
* | user_r25 |
* ------------------ <===== END of PAGE
*/
int copy_thread(unsigned long clone_flags,
unsigned long usp, unsigned long kthread_arg,
struct task_struct *p)
int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
unsigned long kthread_arg, struct task_struct *p, unsigned long tls)
{
struct pt_regs *c_regs; /* child's pt_regs */
unsigned long *childksp; /* to unwind out of __switch_to() */
@ -231,7 +230,7 @@ int copy_thread(unsigned long clone_flags,
* set task's userland tls data ptr from 4th arg
* clone C-lib call is difft from clone sys-call
*/
task_thread_info(p)->thr_ptr = regs->r3;
task_thread_info(p)->thr_ptr = tls;
} else {
/* Normal fork case: set parent's TLS ptr in child */
task_thread_info(p)->thr_ptr =

1
arch/arc/kernel/sys.c
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@ -7,6 +7,7 @@
#include <asm/syscalls.h>
#define sys_clone sys_clone_wrapper
#define sys_clone3 sys_clone3_wrapper
#undef __SYSCALL
#define __SYSCALL(nr, call) [nr] = (call),