sparc: Use tracehook routines in syscall_trace().

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/kernel/entry.S

@@ -1196,8 +1196,9 @@ sys_rt_sigreturn:
 	be	1f
 	 nop
 
+	add	%sp, STACKFRAME_SZ, %o0
 	call	syscall_trace
-	 nop
+	 mov	1, %o1
 
 1:
 	/* We are returning to a signal handler. */
@@ -1287,8 +1288,12 @@ linux_fast_syscall:
 	 mov	%i3, %o3
 
 linux_syscall_trace:
+	add	%sp, STACKFRAME_SZ, %o0
 	call	syscall_trace
-	 nop
+	 mov	0, %o1
+	cmp	%o0, 0
+	bne	3f
+	 mov	-ENOSYS, %o0
 	mov	%i0, %o0
 	mov	%i1, %o1
 	mov	%i2, %o2
@@ -1337,6 +1342,7 @@ syscall_is_too_hard:
 	call	%l7
 	 mov	%i5, %o5
 
+3:
 	st	%o0, [%sp + STACKFRAME_SZ + PT_I0]
 
 ret_sys_call:
@@ -1374,6 +1380,8 @@ ret_sys_call:
 	 st	%l2, [%sp + STACKFRAME_SZ + PT_NPC]
 
 linux_syscall_trace2:
+	add	%sp, STACKFRAME_SZ, %o0
+	mov	1, %o1
 	call	syscall_trace
 	 add	%l1, 0x4, %l2			/* npc = npc+4 */
 	st	%l1, [%sp + STACKFRAME_SZ + PT_PC]

arch/sparc/kernel/ptrace.c

@@ -21,6 +21,7 @@
 #include <linux/signal.h>
 #include <linux/regset.h>
 #include <linux/elf.h>
+#include <linux/tracehook.h>
 
 #include <asm/pgtable.h>
 #include <asm/system.h>
@@ -450,21 +451,16 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 	return ret;
 }
 
-asmlinkage void syscall_trace(void)
+asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p)
 {
-	if (!test_thread_flag(TIF_SYSCALL_TRACE))
-		return;
-	if (!(current->ptrace & PT_PTRACED))
-		return;
-	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;
+	int ret = 0;
+
+	if (test_thread_flag(TIF_SYSCALL_TRACE)) {
+		if (syscall_exit_p)
+			tracehook_report_syscall_exit(regs, 0);
+		else
+			ret = tracehook_report_syscall_entry(regs);
 	}
+
+	return ret;
 }