[ARM] switch ptrace to use an undefined instruction

This avoids a problem with the original ptrace code using a system
call (SWI) to implement single stepping; programs such as ltrace
do not expect to receive system call trace traps when breakpoints
are hit.

1 files changed, 18 insertions, 0 deletions

diff --git a/include/asm-arm/traps.h b/include/asm-arm/traps.h
new file mode 100644
index 000000000000..d4f34dc83eb0
--- /dev/null
+++ b/include/asm-arm/traps.h
@@ -0,0 +1,18 @@
+#ifndef _ASMARM_TRAP_H
+#define _ASMARM_TRAP_H
+
+#include <linux/list.h>
+
+struct undef_hook {
+	struct list_head node;
+	u32 instr_mask;
+	u32 instr_val;
+	u32 cpsr_mask;
+	u32 cpsr_val;
+	int (*fn)(struct pt_regs *regs, unsigned int instr);
+};
+
+void register_undef_hook(struct undef_hook *hook);
+void unregister_undef_hook(struct undef_hook *hook);
+
+#endif