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| author | Max Filippov <jcmvbkbc@gmail.com> | 2018-11-12 08:51:49 +0300 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2018-12-18 00:50:25 +0300 |
| commit | af5395c214c15c18de3decf2229373a8c88c4fde (patch) | |
| tree | d378a62b132af1c2532f745e22c99ac69c40bba2 /arch/xtensa/kernel | |
| parent | 9f24f3c1067c8e4ffbbcd759180b422c9a761b1b (diff) | |
| download | linux-af5395c214c15c18de3decf2229373a8c88c4fde.tar.xz | |
xtensa: implement syscall tracepoints
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>
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/ptrace.c | 8 | ||||
| -rw-r--r-- | arch/xtensa/kernel/syscall.c | 2 |
2 files changed, 8 insertions, 2 deletions
diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c index 207aa272b48c..b964f0b2d886 100644 --- a/arch/xtensa/kernel/ptrace.c +++ b/arch/xtensa/kernel/ptrace.c @@ -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)) diff --git a/arch/xtensa/kernel/syscall.c b/arch/xtensa/kernel/syscall.c index b8240e08f1f1..2c415fce6801 100644 --- a/arch/xtensa/kernel/syscall.c +++ b/arch/xtensa/kernel/syscall.c @@ -28,8 +28,6 @@ #include <linux/sched/mm.h> #include <linux/shm.h> -typedef void (*syscall_t)(void); - syscall_t sys_call_table[__NR_syscalls] /* FIXME __cacheline_aligned */= { [0 ... __NR_syscalls - 1] = (syscall_t)&sys_ni_syscall, |