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xtensa: implement syscall tracepoints

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Add TIF_SYSCALL_TRACEPOINT flag definition; add _TIF_SYSCALL_TRACEPOINT
to _TIF_WORK_MASK. Call trace_sys_enter from do_syscall_trace_enter and
trace_sys_exit from do_syscall_trace_leave when TIF_SYSCALL_TRACEPOINT
flag is set.
Add declaration of sys_call_table to arch/xtensa/include/asm/syscall.h
Add definition of NR_syscalls to arch/xtensa/include/asm/unistd.h
Select HAVE_SYSCALL_TRACEPOINTS.

This change allows tracing each syscall entry and exit through the
ftrace mechanism.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov
2018-11-11 21:51:49 -08:00
parent 9f24f3c106
commit af5395c214
7 changed files with 23 additions and 3 deletions
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8
arch/xtensa/kernel/ptrace.c
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@@ -27,6 +27,9 @@
#include <linux/tracehook.h>
#include <linux/uaccess.h>
#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>
#include <asm/coprocessor.h>
#include <asm/elf.h>
#include <asm/page.h>
@@ -545,12 +548,17 @@ void do_syscall_trace_enter(struct pt_regs *regs)
tracehook_report_syscall_entry(regs))
regs->syscall = NO_SYSCALL;
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, syscall_get_nr(current, regs));
}
void do_syscall_trace_leave(struct pt_regs *regs)
{
int step;
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_exit(regs, regs_return_value(regs));
step = test_thread_flag(TIF_SINGLESTEP);
if (step || test_thread_flag(TIF_SYSCALL_TRACE))