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authorDaniel Jacobowitz <dan@codesourcery.com>2010-02-02 18:22:16 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-02-15 21:39:52 +0000
commitd23bc1b3a7e6db935acb9a949a5985d9b77dfd13 (patch)
tree878b262eff95267cbd3b125885ff7bad21e25b89 /arch/arm/kernel/ptrace.c
parent1a28e3d977860dc760909083df625b300f695680 (diff)
ARM: 5912/1: Define a 32-bit Thumb-2 breakpoint instruction
Recognize 0xf7f0 0xa000 as a 32-bit breakpoint instruction for Thumb-2. Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/ptrace.c')
-rw-r--r--arch/arm/kernel/ptrace.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index a2ea3854cb3..bd56673c6a6 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -499,10 +499,41 @@ static struct undef_hook thumb_break_hook = {
.fn = break_trap,
};
+static int thumb2_break_trap(struct pt_regs *regs, unsigned int instr)
+{
+ unsigned int instr2;
+ void __user *pc;
+
+ /* Check the second half of the instruction. */
+ pc = (void __user *)(instruction_pointer(regs) + 2);
+
+ if (processor_mode(regs) == SVC_MODE) {
+ instr2 = *(u16 *) pc;
+ } else {
+ get_user(instr2, (u16 __user *)pc);
+ }
+
+ if (instr2 == 0xa000) {
+ ptrace_break(current, regs);
+ return 0;
+ } else {
+ return 1;
+ }
+}
+
+static struct undef_hook thumb2_break_hook = {
+ .instr_mask = 0xffff,
+ .instr_val = 0xf7f0,
+ .cpsr_mask = PSR_T_BIT,
+ .cpsr_val = PSR_T_BIT,
+ .fn = thumb2_break_trap,
+};
+
static int __init ptrace_break_init(void)
{
register_undef_hook(&arm_break_hook);
register_undef_hook(&thumb_break_hook);
+ register_undef_hook(&thumb2_break_hook);
return 0;
}