x86: PTRACE_SINGLEBLOCK

This adds the PTRACE_SINGLEBLOCK request on x86, matching the ia64 feature.
The implementation comes from the generic ptrace code and relies on the
low-level machine support provided by arch_has_block_step() et al.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c
index 5ababea1307a..8c6fb9d8352b 100644
--- a/arch/x86/ia32/ptrace32.c
+++ b/arch/x86/ia32/ptrace32.c
@@ -227,6 +227,7 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
         case PTRACE_KILL:
         case PTRACE_CONT:
         case PTRACE_SINGLESTEP:
+        case PTRACE_SINGLEBLOCK:
         case PTRACE_DETACH:
         case PTRACE_SYSCALL:
         case PTRACE_OLDSETOPTIONS:
diff --git a/include/asm-x86/ptrace-abi.h b/include/asm-x86/ptrace-abi.h
index 7524e1233833..adce6b51df2e 100644
--- a/include/asm-x86/ptrace-abi.h
+++ b/include/asm-x86/ptrace-abi.h
@@ -78,4 +78,6 @@
 # define PTRACE_SYSEMU_SINGLESTEP 32
 #endif
 
+#define PTRACE_SINGLEBLOCK      33      /* resume execution until next branch */
+
 #endif