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Subject[PATCH 12/23] Make register values available to Microblaze panic notifiers
The save_ptregs() function has not been tested or even built. I will need
help to complete this.

Signed-off-by: David VomLehn <dvomlehn@cisco.com>
---
arch/microblaze/include/asm/ptrace.h | 109 ++++++++++++++++++++++++++++++++++
1 files changed, 109 insertions(+), 0 deletions(-)
diff --git a/arch/microblaze/include/asm/ptrace.h b/arch/microblaze/include/asm/ptrace.h
index d74dbfb..3ef4464 100644
--- a/arch/microblaze/include/asm/ptrace.h
+++ b/arch/microblaze/include/asm/ptrace.h
@@ -76,6 +76,115 @@ void show_regs(struct pt_regs *);

#endif /* __KERNEL */

+/* 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) "swi " #r ", %[" #r "]\n"
+#define PTREG_SAVE_R(i) PTREG_SAVE_I(r, r, i)
+
+#define PTREG_OUT_R(regs, i) PTREG_OUT_I(regs, r, 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_R(13)
+ PTREG_SAVE_R(14)
+ PTREG_SAVE_R(15)
+ PTREG_SAVE_R(16)
+ PTREG_SAVE_R(17)
+ PTREG_SAVE_R(18)
+ PTREG_SAVE_R(19)
+ PTREG_SAVE_R(20)
+ PTREG_SAVE_R(21)
+ PTREG_SAVE_R(22)
+ PTREG_SAVE_R(23)
+ PTREG_SAVE_R(24)
+ PTREG_SAVE_R(25)
+ PTREG_SAVE_R(26)
+ PTREG_SAVE_R(27)
+ PTREG_SAVE_R(28)
+ PTREG_SAVE_R(29)
+ PTREG_SAVE_R(30)
+ PTREG_SAVE_R(31)
+ PTREG_SAVE(msr, msr)
+ PTREG_SAVE(ear, ear)
+ PTREG_SAVE(esr, esr)
+ PTREG_SAVE(fsr, fsr)
+ PTREG_SAVE(pt_mode, pt_mode)
+ "1:\n"
+ "la r1, 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_R(regs, 13)
+ PTREG_OUT_R(regs, 14)
+ PTREG_OUT_R(regs, 15)
+ PTREG_OUT_R(regs, 16)
+ PTREG_OUT_R(regs, 17)
+ PTREG_OUT_R(regs, 18)
+ PTREG_OUT_R(regs, 19)
+ PTREG_OUT_R(regs, 20)
+ PTREG_OUT_R(regs, 21)
+ PTREG_OUT_R(regs, 22)
+ PTREG_OUT_R(regs, 23)
+ PTREG_OUT_R(regs, 24)
+ PTREG_OUT_R(regs, 25)
+ PTREG_OUT_R(regs, 26)
+ PTREG_OUT_R(regs, 27)
+ PTREG_OUT_R(regs, 28)
+ PTREG_OUT_R(regs, 29)
+ PTREG_OUT_R(regs, 30)
+ PTREG_OUT_R(regs, 31)
+ PTREG_OUT(regs, pc, pc)
+ PTREG_OUT(regs, msr, msr)
+ PTREG_OUT(regs, ear, ear)
+ PTREG_OUT(regs, esr, esr)
+ PTREG_OUT(regs, fsr, fsr)
+ PTREG_OUT(regs, pt_mode, pt_mode)
+ :
+ "r1"
+ );
+
+ return regs;
+}
#endif /* __ASSEMBLY__ */

#endif /* _ASM_MICROBLAZE_PTRACE_H */

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