[PATCH] Uml support: add PTRACE_SYSEMU_SINGLESTEP option to i386
This patch implements the new ptrace option PTRACE_SYSEMU_SINGLESTEP, which
can be used by UML to singlestep a process: it will receive SINGLESTEP
interceptions for normal instructions and syscalls, but syscall execution will
be skipped just like with PTRACE_SYSEMU.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/i386/kernel/ptrace.c b/arch/i386/kernel/ptrace.c
index 18642f0..3196ba5 100644
--- a/arch/i386/kernel/ptrace.c
+++ b/arch/i386/kernel/ptrace.c
@@ -547,11 +547,17 @@
wake_up_process(child);
break;
+ case PTRACE_SYSEMU_SINGLESTEP: /* Same as SYSEMU, but singlestep if not syscall */
case PTRACE_SINGLESTEP: /* set the trap flag. */
ret = -EIO;
if (!valid_signal(data))
break;
- clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
+
+ if (request == PTRACE_SYSEMU_SINGLESTEP)
+ set_tsk_thread_flag(child, TIF_SYSCALL_EMU);
+ else
+ clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
+
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
set_singlestep(child);
child->exit_code = data;
@@ -686,7 +692,10 @@
__attribute__((regparm(3)))
int do_syscall_trace(struct pt_regs *regs, int entryexit)
{
- int is_sysemu, is_singlestep, ret = 0;
+ int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU), ret = 0;
+ /* With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP */
+ int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP);
+
/* do the secure computing check first */
secure_computing(regs->orig_eax);
@@ -696,8 +705,11 @@
if (!(current->ptrace & PT_PTRACED))
goto out;
- is_sysemu = test_thread_flag(TIF_SYSCALL_EMU);
- is_singlestep = test_thread_flag(TIF_SINGLESTEP);
+ /* If a process stops on the 1st tracepoint with SYSCALL_TRACE
+ * and then is resumed with SYSEMU_SINGLESTEP, it will come in
+ * here. We have to check this and return */
+ if (is_sysemu && entryexit)
+ return 0;
/* Fake a debug trap */
if (is_singlestep)
@@ -728,6 +740,7 @@
if (ret == 0)
return 0;
+ regs->orig_eax = -1; /* force skip of syscall restarting */
if (unlikely(current->audit_context))
audit_syscall_exit(current, AUDITSC_RESULT(regs->eax), regs->eax);
return 1;
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 7528afb..2afdafb 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -21,6 +21,7 @@
#define PTRACE_SYSCALL 24
#define PTRACE_SYSEMU 31
+#define PTRACE_SYSEMU_SINGLESTEP 32
/* 0x4200-0x4300 are reserved for architecture-independent additions. */
#define PTRACE_SETOPTIONS 0x4200