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| author | Daniel Jacobowitz <dan@codesourcery.com> | 2010-02-02 20:22:16 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-02-16 00:39:52 +0300 |
| commit | d23bc1b3a7e6db935acb9a949a5985d9b77dfd13 (patch) | |
| tree | 878b262eff95267cbd3b125885ff7bad21e25b89 | |
| parent | 1a28e3d977860dc760909083df625b300f695680 (diff) | |
| download | linux-d23bc1b3a7e6db935acb9a949a5985d9b77dfd13.tar.xz | |
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>
| -rw-r--r-- | arch/arm/kernel/ptrace.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index a2ea3854cb3c..bd56673c6a69 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; } |