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
......@@ -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;
}
......
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