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authorNicolas Pitre <nico@cam.org>2006-01-14 19:30:04 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-01-14 19:30:04 +0000
commit3f471126ee53feb5e9b210ea2f525ed3bb9b7a7f (patch)
tree3f7567343a892d02e758bcd1c07557af43d5aa1b /arch/arm
parent6c90c872017773cde70a51432cb28f253451b967 (diff)
[ARM] 3262/4: allow ptraced syscalls to be overriden
Patch from Nicolas Pitre This is needed by strace to properly handle the tracing of some system calls. It could be useful for other applications as well. Based on an earlier patch from Daniel Jacobowitz. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Daniel Jacobowitz <dan@debian.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/entry-common.S3
-rw-r--r--arch/arm/kernel/ptrace.c15
2 files changed, 15 insertions, 3 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 8826d9803aeb..2b92ce85f97f 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 e591f72bcdeb..7b6256bb590e 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;
}