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authorLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 23:25:06 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-02 23:25:06 (GMT)
commit55a0d3ff603a69ea4ec7677effd457f838390afc (patch)
tree9042a07bea162389678f6660831d312d5d82f0cc /arch/x86/kernel/process_64.c
parent35c23d5d797629a83389bf5dccc5e4a7fb477504 (diff)
parent13bfd47a0ef68fc8b21e67873dbdf269c7db6b59 (diff)
Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 debug update from Ingo Molnar: "Misc debuggability improvements: - Optimize the x86 CPU register printout a bit - Expose the tboot TXT log via debugfs - Small do_debug() cleanup" * 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/tboot: Provide debugfs interfaces to access TXT log x86: Remove weird PTR_ERR() in do_debug x86/debug: Only print out DR registers if they are not power-on defaults
Diffstat (limited to 'arch/x86/kernel/process_64.c')
-rw-r--r--arch/x86/kernel/process_64.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index f99a242..05646ba 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -105,11 +105,18 @@ void __show_regs(struct pt_regs *regs, int all)
get_debugreg(d0, 0);
get_debugreg(d1, 1);
get_debugreg(d2, 2);
- printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
get_debugreg(d3, 3);
get_debugreg(d6, 6);
get_debugreg(d7, 7);
+
+ /* Only print out debug registers if they are in their non-default state. */
+ if ((d0 == 0) && (d1 == 0) && (d2 == 0) && (d3 == 0) &&
+ (d6 == DR6_RESERVED) && (d7 == 0x400))
+ return;
+
+ printk(KERN_DEFAULT "DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
printk(KERN_DEFAULT "DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7);
+
}
void release_thread(struct task_struct *dead_task)

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