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-rw-r--r--arch/arm/kernel/entry-common.S3
-rw-r--r--arch/arm/kernel/ptrace.c15
-rw-r--r--include/asm-arm/ptrace.h3
3 files changed, 18 insertions, 3 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 8826d98..2b92ce8 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/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
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index e591f72b..7b6256b 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/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;
}
diff --git a/include/asm-arm/ptrace.h b/include/asm-arm/ptrace.h
index f40948d..77adb7f 100644
--- a/include/asm-arm/ptrace.h
+++ b/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
*/
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