linux-kernel - [patch] xtensa: implement PTRACE

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Message-Id: <1237978628-23746-1-git-send-email-dg@emlix.com>
Date:	Wed, 25 Mar 2009 11:57:08 +0100
From:	Daniel Glöckner <dg@...ix.com>
To:	Chris Zankel <chris@...kel.net>
Cc:	linux-kernel@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
	Daniel Glöckner <dg@...ix.com>
Subject: [patch] xtensa: implement PTRACE_PEEKUSER addresses for nommu

On nommu gdbserver needs to be able to look up where the currently
debugged application has been relocated. Based on the Blackfin
implementation, this introduces three "addresses" PT_TEXT_ADDR,
PT_DATA_ADDR, and PT_TEXT_END_ADDR for PTRACE_PEEKUSER.

Signed-off-by: Daniel Glöckner <dg@...ix.com>
---
 arch/xtensa/include/asm/ptrace.h |    4 ++++
 arch/xtensa/kernel/ptrace.c      |   12 ++++++++++++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/arch/xtensa/include/asm/ptrace.h b/arch/xtensa/include/asm/ptrace.h
index 905e1e6..8f4fbf3 100644
--- a/arch/xtensa/include/asm/ptrace.h
+++ b/arch/xtensa/include/asm/ptrace.h
@@ -66,6 +66,10 @@
 
 #define SYSCALL_NR	0x00ff
 
+#define PT_TEXT_ADDR	0x0300
+#define PT_DATA_ADDR	0x0301
+#define PT_TEXT_END_ADDR	0x0302
+
 /* Other PTRACE_ values defined in <linux/ptrace.h> using values 0-9,16,17,24 */
 
 #define PTRACE_GETREGS		12
diff --git a/arch/xtensa/kernel/ptrace.c b/arch/xtensa/kernel/ptrace.c
index 9486882..82f3620 100644
--- a/arch/xtensa/kernel/ptrace.c
+++ b/arch/xtensa/kernel/ptrace.c
@@ -211,6 +211,18 @@ int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
 			tmp = regs->syscall;
 			break;
 
+		case PT_TEXT_ADDR:
+			tmp = child->mm->start_code;
+			break;
+
+		case PT_DATA_ADDR:
+			tmp = child->mm->start_data;
+			break;
+
+		case PT_TEXT_END_ADDR:
+			tmp = child->mm->end_code;
+			break;
+
 		default:
 			return -EIO;
 	}
-- 
1.6.2.107.ge47ee

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