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xtensa: call do_syscall_trace_{enter,leave} selectively

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Check whether calls to do_syscall_trace_{enter,leave} are necessary in
the system_call function. Define _TIF_WORK_MASK to a bitmask of flags
that reuire the calls. Fix comment.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2018-11-15 19:33:47 -08:00
parent 6a986984b6
commit 3aee3e25de
3 changed files with 22 additions and 14 deletions
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5
arch/xtensa/include/asm/thread_info.h
View File

@ -101,8 +101,6 @@ static inline struct thread_info *current_thread_info(void)
/*
* thread information flags
* - these are process state flags that various assembly files may need to access
* - pending work-to-be-done flags are in LSW
* - other flags in MSW
*/
#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
#define TIF_SIGPENDING 1 /* signal pending */
@ -118,8 +116,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
#define _TIF_WORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP)
/*
* Thread-synchronous status.

26
arch/xtensa/kernel/entry.S
View File

@ -1846,20 +1846,28 @@ ENTRY(system_call)
/* regs->syscall = regs->areg[2] */
l32i a3, a2, PT_AREG2
mov a6, a2
s32i a3, a2, PT_SYSCALL
call4 do_syscall_trace_enter
mov a3, a6
l32i a7, a2, PT_AREG2
s32i a7, a2, PT_SYSCALL
GET_THREAD_INFO(a4, a1)
l32i a3, a4, TI_FLAGS
movi a4, _TIF_WORK_MASK
and a3, a3, a4
beqz a3, 1f
mov a6, a2
call4 do_syscall_trace_enter
l32i a7, a2, PT_SYSCALL
1:
/* syscall = sys_call_table[syscall_nr] */
movi a4, sys_call_table
movi a5, __NR_syscalls
movi a6, -ENOSYS
bgeu a3, a5, 1f
bgeu a7, a5, 1f
addx4 a4, a3, a4
addx4 a4, a7, a4
l32i a4, a4, 0
movi a5, sys_ni_syscall;
beq a4, a5, 1f
@ -1881,6 +1889,10 @@ ENTRY(system_call)
1: /* regs->areg[2] = return_value */
s32i a6, a2, PT_AREG2
bnez a3, 1f
retw
1:
mov a6, a2
call4 do_syscall_trace_leave
retw

5
arch/xtensa/kernel/ptrace.c
View File

@ -487,13 +487,12 @@ long arch_ptrace(struct task_struct *child, long request,
return ret;
}
unsigned long do_syscall_trace_enter(struct pt_regs *regs)
void do_syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
tracehook_report_syscall_entry(regs))
return NO_SYSCALL;
regs->syscall = NO_SYSCALL;
return regs->areg[2];
}
void do_syscall_trace_leave(struct pt_regs *regs)