xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: kprobes: Fix probing of conditionally executed instructions

Browse Source 
When a kprobe is placed onto conditionally executed ARM instructions,
many of the emulation routines used to single step them produce corrupt
register results. Rather than fix all of these cases we modify the
framework which calls them to test the relevant condition flags and, if
the test fails, skip calling the emulation code.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst
2011-04-06 11:17:09 +01:00
committed by Nicolas Pitre
parent cf3cc1aa9b
commit 073090cb70
3 changed files with 96 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm/kernel/kprobes.c
View File

@@ -134,7 +134,8 @@ static void __kprobes singlestep(struct kprobe *p, struct pt_regs *regs,
struct kprobe_ctlblk *kcb)
{
regs->ARM_pc += 4;
p->ainsn.insn_handler(p, regs);
if (p->ainsn.insn_check_cc(regs->ARM_cpsr))
p->ainsn.insn_handler(p, regs);
}
/*