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Subject[PATCH 21/27] ptrace: generic PTRACE_SINGLEBLOCK
Date

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@redhat.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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