---

yaml
---
r: 18558
b: refs/heads/master
c: 3f47112
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6c90c872017773cde70a51432cb28f253451b967
+refs/heads/master: 3f471126ee53feb5e9b210ea2f525ed3bb9b7a7f

trunk/arch/arm/kernel/entry-common.S

@@ -214,11 +214,13 @@ ENTRY(vector_swi)
 	 * context switches, and waiting for our parent to respond.
 	 */
 __sys_trace:
+	mov	r2, scno
 	add	r1, sp, #S_OFF
 	mov	r0, #0				@ trace entry [IP = 0]
 	bl	syscall_trace
 
 	adr	lr, __sys_trace_return		@ return address
+	mov	scno, r0			@ syscall number (possibly new)
 	add	r1, sp, #S_R0 + S_OFF		@ pointer to regs
 	cmp	scno, #NR_syscalls		@ check upper syscall limit
 	ldmccia	r1, {r0 - r3}			@ have to reload r0 - r3
@@ -227,6 +229,7 @@ __sys_trace:
 
 __sys_trace_return:
 	str	r0, [sp, #S_R0 + S_OFF]!	@ save returned r0
+	mov	r2, scno
 	mov	r1, sp
 	mov	r0, #1				@ trace exit [IP = 1]
 	bl	syscall_trace

trunk/arch/arm/kernel/ptrace.c

@@ -766,6 +766,11 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 				       (unsigned long __user *) data);
 			break;
 
+		case PTRACE_SET_SYSCALL:
+			ret = 0;
+			child->ptrace_message = data;
+			break;
+
 		default:
 			ret = ptrace_request(child, request, addr, data);
 			break;
@@ -774,14 +779,14 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 	return ret;
 }
 
-asmlinkage void syscall_trace(int why, struct pt_regs *regs)
+asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
 {
 	unsigned long ip;
 
 	if (!test_thread_flag(TIF_SYSCALL_TRACE))
-		return;
+		return scno;
 	if (!(current->ptrace & PT_PTRACED))
-		return;
+		return scno;
 
 	/*
 	 * Save IP.  IP is used to denote syscall entry/exit:
@@ -790,6 +795,8 @@ asmlinkage void syscall_trace(int why, struct pt_regs *regs)
 	ip = regs->ARM_ip;
 	regs->ARM_ip = why;
 
+	current->ptrace_message = scno;
+
 	/* 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)
@@ -804,4 +811,6 @@ asmlinkage void syscall_trace(int why, struct pt_regs *regs)
 		current->exit_code = 0;
 	}
 	regs->ARM_ip = ip;
+
+	return current->ptrace_message;
 }

trunk/include/asm-arm/ptrace.h

@@ -23,6 +23,9 @@
 #define PTRACE_OLDSETOPTIONS	21
 
 #define PTRACE_GET_THREAD_AREA	22
+
+#define PTRACE_SET_SYSCALL	23
+
 /*
  * PSR bits
  */