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authorMax Filippov <jcmvbkbc@gmail.com>2015-03-16 14:40:14 +0300
committerMax Filippov <jcmvbkbc@gmail.com>2017-05-01 07:00:10 -0700
commitf984409a00e7d9aa40af64d7c9619e5de3d980bf (patch)
tree5ea7712929934f428eba2d59abf3eda6e6532d2b /arch/xtensa/kernel
parent0700ed072feffd65212e6a03840d19c4988d6820 (diff)
downloadlinux-f984409a00e7d9aa40af64d7c9619e5de3d980bf.tar.bz2
xtensa: use generic tracehooks
Use tracehook_report_syscall_{entry,exit} instead of a local copy of it in do_syscall_trace. Allow tracehook to cancel syscall by returning invalid syscall number to the system_call function. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel')
-rw-r--r--arch/xtensa/kernel/entry.S3
-rw-r--r--arch/xtensa/kernel/ptrace.c38
2 files changed, 14 insertions, 27 deletions
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index f5ef3cc0497c..37a239556889 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -1899,10 +1899,11 @@ ENTRY(system_call)
movi a4, do_syscall_trace_enter
s32i a3, a2, PT_SYSCALL
callx4 a4
+ mov a3, a6
/* syscall = sys_call_table[syscall_nr] */
- movi a4, sys_call_table;
+ movi a4, sys_call_table
movi a5, __NR_syscall_count
movi a6, -ENOSYS
bgeu a3, a5, 1f
diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c
index ae7985ec7b8e..e2461968efb2 100644
--- a/arch/xtensa/kernel/ptrace.c
+++ b/arch/xtensa/kernel/ptrace.c
@@ -23,6 +23,7 @@
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/smp.h>
+#include <linux/tracehook.h>
#include <linux/uaccess.h>
#include <asm/coprocessor.h>
@@ -468,36 +469,21 @@ long arch_ptrace(struct task_struct *child, long request,
return ret;
}
-void do_syscall_trace(void)
-{
- /*
- * The 0x80 provides a way for the tracing parent to distinguish
- * between a syscall stop and SIGTRAP delivery
- */
- ptrace_notify(SIGTRAP |
- ((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
-
- /*
- * this isn't the same as continuing with a signal, but it will do
- * for normal use. strace only continues with a signal if the
- * stopping signal is not SIGTRAP. -brl
- */
- if (current->exit_code) {
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
-}
-
-void do_syscall_trace_enter(struct pt_regs *regs)
+unsigned long do_syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE) &&
- (current->ptrace & PT_PTRACED))
- do_syscall_trace();
+ tracehook_report_syscall_entry(regs))
+ return -1;
+
+ return regs->areg[2];
}
void do_syscall_trace_leave(struct pt_regs *regs)
{
- if (test_thread_flag(TIF_SYSCALL_TRACE) &&
- (current->ptrace & PT_PTRACED))
- do_syscall_trace();
+ int step;
+
+ step = test_thread_flag(TIF_SINGLESTEP);
+
+ if (step || test_thread_flag(TIF_SYSCALL_TRACE))
+ tracehook_report_syscall_exit(regs, step);
}