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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/mn10300/include/asm/ptrace.h | 92 +++++++++++++++++++++++++++++++++++++
arch/mn10300/kernel/traps.c | 2 +-
2 files changed, 93 insertions(+), 1 deletions(-)

diff --git a/arch/mn10300/include/asm/ptrace.h b/arch/mn10300/include/asm/ptrace.h
index 1b0ba5e..e8e3548 100644
--- a/arch/mn10300/include/asm/ptrace.h
+++ b/arch/mn10300/include/asm/ptrace.h
@@ -102,6 +102,98 @@ extern void show_regs(struct pt_regs *);
extern void user_enable_single_step(struct task_struct *);
extern void user_disable_single_step(struct task_struct *);

+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+#define PTREG_SAVE(r, name) "mov " #r ", %[" #name "]\n"
+#define PTREG_SAVE_D(i) PTREG_SAVE_I(d, d, i)
+#define PTREG_SAVE_A(i) PTREG_SAVE_I(a, a, i)
+#define PTREG_SAVE_E(i) PTREG_SAVE_I(e, e, i)
+
+#define PTREG_OUT_D(regs, i) PTREG_OUT_I(regs, d, d, i)
+#define PTREG_OUT_A(regs, i) PTREG_OUT_I(regs, a, a, i)
+#define PTREG_OUT_E(regs, i) PTREG_OUT_I(regs, e, e, 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_A(3)
+ PTREG_SAVE_A(2)
+ PTREG_SAVE_D(3)
+ PTREG_SAVE_D(2)
+ PTREG_SAVE(mcvf, mcvf)
+ PTREG_SAVE(mcrl, mcrl)
+ PTREG_SAVE(mcrh, mcrh)
+ PTREG_SAVE(mdrq, mdrq)
+ PTREG_SAVE_E(1)
+ PTREG_SAVE_E(0)
+ PTREG_SAVE_E(7)
+ PTREG_SAVE_E(6)
+ PTREG_SAVE_E(5)
+ PTREG_SAVE_E(4)
+ PTREG_SAVE_E(3)
+ PTREG_SAVE_E(2)
+ PTREG_SAVE(sp, sp)
+ PTREG_SAVE(lar, lar)
+ PTREG_SAVE(lir, lir)
+ PTREG_SAVE(mdr, mdr)
+ PTREG_SAVE_A(1)
+ PTREG_SAVE_A(0)
+ PTREG_SAVE_D(1)
+ PTREG_SAVE_D(0)
+ PTREG_SAVE(next, next)
+ PTREG_SAVE(orig_d0, orig_d0)
+ PTREG_SAVE(epsw, epsw)
+ "1:\n"
+ "mov 1b, a0\n"
+ PTREG_SAVE(a0, pc)
+ :
+ PTREG_OUT_A(regs, 3)
+ PTREG_OUT_A(regs, 2)
+ PTREG_OUT_D(regs, 3)
+ PTREG_OUT_D(regs, 2)
+ PTREG_OUT(regs, mcvf, mcvf)
+ PTREG_OUT(regs, mcrl, mcrl)
+ PTREG_OUT(regs, mcrh, mcrh)
+ PTREG_OUT(regs, mdrq, mdrq)
+ PTREG_OUT_E(regs, 1)
+ PTREG_OUT_E(regs, 0)
+ PTREG_OUT_E(regs, 7)
+ PTREG_OUT_E(regs, 6)
+ PTREG_OUT_E(regs, 5)
+ PTREG_OUT_E(regs, 4)
+ PTREG_OUT_E(regs, 3)
+ PTREG_OUT_E(regs, 2)
+ PTREG_OUT(regs, sp, sp)
+ PTREG_OUT(regs, lar, lar)
+ PTREG_OUT(regs, lir, lir)
+ PTREG_OUT(regs, mdr, mdr)
+ PTREG_OUT_A(regs, 1)
+ PTREG_OUT_A(regs, 0)
+ PTREG_OUT_D(regs, 1)
+ PTREG_OUT_D(regs, 0)
+ PTREG_OUT(regs, next, next)
+ PTREG_OUT(regs, orig_d0, orig_d0)
+ PTREG_OUT(regs, epsw, epsw)
+ PTREG_OUT(regs, pc, pc)
+ :
+ "a0"
+ );
+
+ return regs;
+}
#endif /* !__ASSEMBLY */

#define profile_pc(regs) ((regs)->pc)
diff --git a/arch/mn10300/kernel/traps.c b/arch/mn10300/kernel/traps.c
index 91365ad..0251adf 100644
--- a/arch/mn10300/kernel/traps.c
+++ b/arch/mn10300/kernel/traps.c
@@ -471,7 +471,7 @@ asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
printk(KERN_EMERG "\n");
show_registers(regs);

- panic("Halted due to asynchronous I/O Bus Error\n");
+ panic_with_regs(regs, "Halted due to asynchronous I/O Bus Error\n");
}

/*
--
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Prev: [PATCH 4/23] Make register values available to AV32 panic notifiers
Next: [PATCH 12/23] Make register values available to Microblaze panic notifiers