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authorRoland McGrath <roland@redhat.com>2008-01-30 13:30:54 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:54 +0100
commit10faa81e102e2b7695f386812055cd2ef9e44b4c (patch)
treebd21d2094eacca5b07d5ee5977cb0ad57ebc5c02 /include
parent7e9916040b3020d0f36d68bb7512e3b80b623097 (diff)
x86: debugctlmsr arch_has_block_step
This implements user-mode step-until-branch on x86 using the BTF bit in MSR_IA32_DEBUGCTLMSR. It's just like single-step, only less so. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/asm-x86/ptrace.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/asm-x86/ptrace.h b/include/asm-x86/ptrace.h
index d223decd7b0..04204f35929 100644
--- a/include/asm-x86/ptrace.h
+++ b/include/asm-x86/ptrace.h
@@ -150,6 +150,13 @@ enum {
extern void user_enable_single_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);
+extern void user_enable_block_step(struct task_struct *);
+#ifdef CONFIG_X86_DEBUGCTLMSR
+#define arch_has_block_step() (1)
+#else
+#define arch_has_block_step() (boot_cpu_data.x86 >= 6)
+#endif
+
struct user_desc;
extern int do_get_thread_area(struct task_struct *p, int idx,
struct user_desc __user *info);