ARC: Implement ptrace(PTRACE_GET_THREAD_AREA)

commit a4b6cb735b25aa84a462a1985e3e43bebaf5beb4 upstream.

This patch adds implementation of GET_THREAD_AREA ptrace request type. This
is required by GDB to debug NPTL applications.

Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arc/include/uapi/asm/ptrace.h b/arch/arc/include/uapi/asm/ptrace.h
index 30333cec0fef274365aeb559084d58a5ee023a9b..ef9d79a3db2550e4041b61f9dab4c3188952d202 100644 (file)
--- a/arch/arc/include/uapi/asm/ptrace.h
+++ b/arch/arc/include/uapi/asm/ptrace.h
@@ -11,6 +11,7 @@
 #ifndef _UAPI__ASM_ARC_PTRACE_H
 #define _UAPI__ASM_ARC_PTRACE_H
 
+#define PTRACE_GET_THREAD_AREA 25
 
 #ifndef __ASSEMBLY__
 /*

diff --git a/arch/arc/kernel/ptrace.c b/arch/arc/kernel/ptrace.c
index 0851604bb9cd8929f4d98465d4ca8a646a255ec3..f8a36ed9e0d57807af574fea6d1a5c0230c5b547 100644 (file)
--- a/arch/arc/kernel/ptrace.c
+++ b/arch/arc/kernel/ptrace.c
@@ -136,6 +136,10 @@ long arch_ptrace(struct task_struct *child, long request,
        pr_debug("REQ=%ld: ADDR =0x%lx, DATA=0x%lx)\n", request, addr, data);
 
        switch (request) {
+       case PTRACE_GET_THREAD_AREA:
+               ret = put_user(task_thread_info(child)->thr_ptr,
+                              (unsigned long __user *)data);
+               break;
        default:
                ret = ptrace_request(child, request, addr, data);
                break;