linux-kernel - [PATCH 21/27] ptrace: generic PTRACE

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Message-Id: <20071125220611.245BB26F8C5@magilla.localdomain>
Date:	Sun, 25 Nov 2007 14:06:11 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 21/27] ptrace: generic PTRACE_SINGLEBLOCK


This makes ptrace_request handle PTRACE_SINGLEBLOCK along with
PTRACE_CONT et al.  The new generic code makes use of the
arch_has_block_step macro and generic entry points on machines
that define them.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 kernel/ptrace.c |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 309796a..2824726 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -373,6 +373,12 @@ static int ptrace_setsiginfo(struct task_struct *child, siginfo_t __user * data)
 #define is_singlestep(request)		0
 #endif
 
+#ifdef PTRACE_SINGLEBLOCK
+#define is_singleblock(request)		((request) == PTRACE_SINGLEBLOCK)
+#else
+#define is_singleblock(request)		0
+#endif
+
 #ifdef PTRACE_SYSEMU
 #define is_sysemu_singlestep(request)	((request) == PTRACE_SYSEMU_SINGLESTEP)
 #else
@@ -396,7 +402,11 @@ static int ptrace_resume(struct task_struct *child, long request, long data)
 		clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
 #endif
 
-	if (is_singlestep(request) || is_sysemu_singlestep(request)) {
+	if (is_singleblock(request)) {
+		if (unlikely(!arch_has_block_step()))
+			return -EIO;
+		user_enable_block_step(child);
+	} else if (is_singlestep(request) || is_sysemu_singlestep(request)) {
 		if (unlikely(!arch_has_single_step()))
 			return -EIO;
 		user_enable_single_step(child);
@@ -438,6 +448,9 @@ int ptrace_request(struct task_struct *child, long request,
 #ifdef PTRACE_SINGLESTEP
 	case PTRACE_SINGLESTEP:
 #endif
+#ifdef PTRACE_SINGLEBLOCK
+	case PTRACE_SINGLEBLOCK:
+#endif
 #ifdef PTRACE_SYSEMU
 	case PTRACE_SYSEMU:
 	case PTRACE_SYSEMU_SINGLESTEP:
-
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