Commit d23bc1b3 authored by Daniel Jacobowitz's avatar Daniel Jacobowitz Committed by Russell King
Browse files

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: default avatarDaniel Jacobowitz <dan@codesourcery.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 1a28e3d9

arch/arm/kernel/ptrace.c

+31 −0
Original line number Diff line number Diff line
@@ -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;

}