From: Anton Kolesov <Anton.Kolesov@synopsys.com>
Date: Fri, 20 Jun 2014 16:28:39 +0000 (+0400)
Subject: ARC: Implement ptrace(PTRACE_GET_THREAD_AREA)
X-Git-Tag: firefly_0821_release~3679^2~1753
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a290f3552cc7b68398df8bbca5290bad0867827b;p=firefly-linux-kernel-4.4.55.git

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 30333cec0fef..ef9d79a3db25 100644
--- 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 0851604bb9cd..f8a36ed9e0d5 100644
--- 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;