[PATCH 15/23] Make register values available to PA-RISC panicnotifiers
From: David VomLehn
Date: Mon Apr 12 2010 - 02:04:36 EST
The save_ptregs() function has not been tested or even built. I will need
help to complete this.
Signed-off-by: David VomLehn <dvomlehn@xxxxxxxxx>
---
arch/parisc/include/asm/ptrace.h | 146 ++++++++++++++++++++++++++++++++++++++
arch/parisc/kernel/traps.c | 4 +-
2 files changed, 148 insertions(+), 2 deletions(-)
diff --git a/arch/parisc/include/asm/ptrace.h b/arch/parisc/include/asm/ptrace.h
index aead40b..f95d560 100644
--- a/arch/parisc/include/asm/ptrace.h
+++ b/arch/parisc/include/asm/ptrace.h
@@ -63,6 +63,152 @@ void user_enable_block_step(struct task_struct *task);
unsigned long profile_pc(struct pt_regs *);
extern void show_regs(struct pt_regs *);
+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+#include "/home/vomlehn/git/kernel.org/ptreg.h"
+#define PTREG_SAVE(r, name) "stw %%" #r ", %[" #r "]\n"
+#define PTREG_SAVE_GR(i) PTREG_SAVE_IDX(gr, r, i)
+#define PTREG_SAVE_SR(i) PTREG_SAVE_IDX(sr, sr, i)
+#define PTREG_SAVE_IASQ(i) PTREG_SAVE_IDX(iasq, iasq, i)
+#define PTREG_SAVE_IAOQ(i) PTREG_SAVE_IDX(iaoq, iaoq, i)
+
+#define PTREG_OUT_GR(regs, i) PTREG_SAVE_IDX(regs, gr, gr, i)
+#define PTREG_OUT_SR(regs, i) PTREG_SAVE_IDX(regs, sr, sr, i)
+#define PTREG_OUT_IASQ(regs, i) PTREG_SAVE_IDX(regs, iasq, iasq, i)
+#define PTREG_OUT_IAOQ(regs, i) PTREG_SAVE_IDX(regs, iaoq, iaoq, i)
+
+#define arch_has_save_ptregs 1
+
+/**
+ * save_ptregs - save processor registers for backtracing
+ * @regs: Pointer to &struct pt_regs structure in which to save the
+ * registers
+ *
+ * Returns a constant pointer to @regs.
+ *
+ * This function must be called first in a function. There must be no
+ * auto variables defined that are initialized before calling this function.
+ */
+static __always_inline
+const struct pt_regs *save_ptregs(struct pt_regs *regs)
+{
+ __asm__ __volatile__ (
+ PTREG_SAVE_GR(0)
+ PTREG_SAVE_GR(1)
+ PTREG_SAVE_GR(2)
+ PTREG_SAVE_GR(3)
+ PTREG_SAVE_GR(4)
+ PTREG_SAVE_GR(5)
+ PTREG_SAVE_GR(6)
+ PTREG_SAVE_GR(7)
+ PTREG_SAVE_GR(8)
+ PTREG_SAVE_GR(9)
+ PTREG_SAVE_GR(10)
+ PTREG_SAVE_GR(11)
+ PTREG_SAVE_GR(12)
+ PTREG_SAVE_GR(13)
+ PTREG_SAVE_GR(14)
+ PTREG_SAVE_GR(15)
+ PTREG_SAVE_GR(16)
+ PTREG_SAVE_GR(17)
+ PTREG_SAVE_GR(18)
+ PTREG_SAVE_GR(19)
+ PTREG_SAVE_GR(20)
+ PTREG_SAVE_GR(21)
+ PTREG_SAVE_GR(22)
+ PTREG_SAVE_GR(23)
+ PTREG_SAVE_GR(24)
+ PTREG_SAVE_GR(25)
+ PTREG_SAVE_GR(26)
+ PTREG_SAVE_GR(27)
+ PTREG_SAVE_GR(28)
+ PTREG_SAVE_GR(29)
+ PTREG_SAVE_GR(30)
+ PTREG_SAVE_GR(31)
+ PTREG_SAVE_SR(0)
+ PTREG_SAVE_SR(1)
+ PTREG_SAVE_SR(2)
+ PTREG_SAVE_SR(3)
+ PTREG_SAVE_SR(4)
+ PTREG_SAVE_SR(5)
+ PTREG_SAVE_SR(6)
+ PTREG_SAVE_SR(7)
+ PTREG_SAVE_IASQ(0)
+ PTREG_SAVE_IASQ(1)
+ PTREG_SAVE_IAOQ(0)
+ PTREG_SAVE_IAOQ(1)
+ PTREG_SAVE(cr27, cr27)
+ PTREG_SAVE(orig_r28, orig_r28)
+ PTREG_SAVE(ksp, ksp)
+ PTREG_SAVE(kpc, kpc)
+ PTREG_SAVE(sar, sar)
+ PTREG_SAVE(iir, iir)
+ PTREG_SAVE(isr, isr)
+ PTREG_SAVE(ior, ior)
+ PTREG_SAVE(ipsw, ipsw)
+ "1:\n"
+ "ldil 1b, %r1\n"
+ PTSAVE(r0, pc)
+ :
+ PTREG_OUT_GR(regs, 0)
+ PTREG_OUT_GR(regs, 1)
+ PTREG_OUT_GR(regs, 2)
+ PTREG_OUT_GR(regs, 3)
+ PTREG_OUT_GR(regs, 4)
+ PTREG_OUT_GR(regs, 5)
+ PTREG_OUT_GR(regs, 6)
+ PTREG_OUT_GR(regs, 7)
+ PTREG_OUT_GR(regs, 8)
+ PTREG_OUT_GR(regs, 9)
+ PTREG_OUT_GR(regs, 10)
+ PTREG_OUT_GR(regs, 11)
+ PTREG_OUT_GR(regs, 12)
+ PTREG_OUT_GR(regs, 13)
+ PTREG_OUT_GR(regs, 14)
+ PTREG_OUT_GR(regs, 15)
+ PTREG_OUT_GR(regs, 16)
+ PTREG_OUT_GR(regs, 17)
+ PTREG_OUT_GR(regs, 18)
+ PTREG_OUT_GR(regs, 19)
+ PTREG_OUT_GR(regs, 20)
+ PTREG_OUT_GR(regs, 21)
+ PTREG_OUT_GR(regs, 22)
+ PTREG_OUT_GR(regs, 23)
+ PTREG_OUT_GR(regs, 24)
+ PTREG_OUT_GR(regs, 25)
+ PTREG_OUT_GR(regs, 26)
+ PTREG_OUT_GR(regs, 27)
+ PTREG_OUT_GR(regs, 28)
+ PTREG_OUT_GR(regs, 29)
+ PTREG_OUT_GR(regs, 30)
+ PTREG_OUT_GR(regs, 31)
+ PTREG_OUT_SR(regs, 0)
+ PTREG_OUT_SR(regs, 1)
+ PTREG_OUT_SR(regs, 2)
+ PTREG_OUT_SR(regs, 3)
+ PTREG_OUT_SR(regs, 4)
+ PTREG_OUT_SR(regs, 5)
+ PTREG_OUT_SR(regs, 6)
+ PTREG_OUT_SR(regs, 7)
+ PTREG_OUT_IASQ(regs, 0)
+ PTREG_OUT_IASQ(regs, 1)
+ PTREG_OUT_IAOQ(regs, 0)
+ PTREG_OUT_IAOQ(regs, 1)
+ PTREG_OUT(regs, cr27, cr27)
+ PTREG_OUT(regs, orig_r28, orig_r28)
+ PTREG_OUT(regs, ksp, ksp)
+ PTREG_OUT(regs, kpc, kpc)
+ PTREG_OUT(regs, sar, sar)
+ PTREG_OUT(regs, iir, iir)
+ PTREG_OUT(regs, isr, isr)
+ PTREG_OUT(regs, ior, ior)
+ PTREG_OUT(regs, ipsw, ipsw)
+ :
+ "r0"
+ );
+
+ return regs;
+}
#endif /* __KERNEL__ */
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 8b58bf0..23dabd2 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -286,12 +286,12 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
add_taint(TAINT_DIE);
if (in_interrupt())
- panic("Fatal exception in interrupt");
+ panic_with_regs(regs, "Fatal exception in interrupt");
if (panic_on_oops) {
printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
ssleep(5);
- panic("Fatal exception");
+ panic_with_regs(regs, "Fatal exception");
}
oops_exit();
--
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