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From: David VomLehn on 12 Apr 2010 02:10
The save_ptregs() function has not been tested or even built. I will need
help to complete this.

Signed-off-by: David VomLehn <dvomlehn(a)cisco.com>
---
arch/avr32/include/asm/ptrace.h | 68 +++++++++++++++++++++++++++++++++++++++
arch/avr32/kernel/traps.c | 4 +-
2 files changed, 70 insertions(+), 2 deletions(-)

diff --git a/arch/avr32/include/asm/ptrace.h b/arch/avr32/include/asm/ptrace.h
index e53dd0d..28b7f25 100644
--- a/arch/avr32/include/asm/ptrace.h
+++ b/arch/avr32/include/asm/ptrace.h
@@ -151,6 +151,74 @@ static __inline__ int valid_user_regs(struct pt_regs *regs)
return 0;
}

+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+#define PTREG_SAVE(r, name) "st.w " #r ", %[" #name "]\n"
+#define PTREG_SAVE_R(i) PTREG_SAVE_I(r, r, i)
+
+#define PTREG_OUT_R(regs, i) PTREG_OUT(regs, r##i, r##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_R(0)
+ PTREG_SAVE_R(1)
+ PTREG_SAVE_R(2)
+ PTREG_SAVE_R(3)
+ PTREG_SAVE_R(4)
+ PTREG_SAVE_R(5)
+ PTREG_SAVE_R(6)
+ PTREG_SAVE_R(7)
+ PTREG_SAVE_R(8)
+ PTREG_SAVE_R(9)
+ PTREG_SAVE_R(10)
+ PTREG_SAVE_R(11)
+ PTREG_SAVE_R(12)
+ PTREG_SAVE(sp, sp)
+ PTREG_SAVE(lr, lr)
+ PTREG_SAVE(sr, sr)
+ PTREG_SAVE(r12_orig, r12_orig)
+ "1:\n"
+ "mov r0, 1b\n"
+ PTREG_SAVE(r0, pc)
+ :
+ PTREG_OUT_R(regs, 0),
+ PTREG_OUT_R(regs, 1),
+ PTREG_OUT_R(regs, 2),
+ PTREG_OUT_R(regs, 3),
+ PTREG_OUT_R(regs, 4),
+ PTREG_OUT_R(regs, 5),
+ PTREG_OUT_R(regs, 6),
+ PTREG_OUT_R(regs, 7),
+ PTREG_OUT_R(regs, 8),
+ PTREG_OUT_R(regs, 9),
+ PTREG_OUT_R(regs, 10),
+ PTREG_OUT_R(regs, 11),
+ PTREG_OUT_R(regs, 12),
+ PTREG_OUT(regs, sp, sp),
+ PTREG_OUT(regs, lr, lr),
+ PTREG_OUT(regs, pc, pc),
+ PTREG_OUT(regs, sr, sr),
+ PTREG_OUT(regs, r12_orig, r12_orig)
+ :
+ "r0"
+ );
+
+ return regs;
+}

#endif /* __KERNEL__ */

diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c
index b91b204..100c52a 100644
--- a/arch/avr32/kernel/traps.c
+++ b/arch/avr32/kernel/traps.c
@@ -65,10 +65,10 @@ void NORET_TYPE die(const char *str, struct pt_regs *regs, long err)
spin_unlock_irq(&die_lock);

if (in_interrupt())
- panic("Fatal exception in interrupt");
+ panic_with_regs(regs, "Fatal exception in interrupt");

if (panic_on_oops)
- panic("Fatal exception");
+ panic_with_regs(regs, "Fatal exception");

do_exit(err);
}
--
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Prev: [PATCH 10/23] Make register values available to M32R panic notifiers
Next: [PATCH 14/23] Make register values available to MN10300 panic notifiers