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Subject[PATCH 6/23] Make register values available to CRIS 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/cris/include/arch-v10/arch/ptrace.h | 80 ++++++++++++++++++++++++++++
arch/cris/include/arch-v32/arch/ptrace.h | 84 ++++++++++++++++++++++++++++++
2 files changed, 164 insertions(+), 0 deletions(-)
diff --git a/arch/cris/include/arch-v10/arch/ptrace.h b/arch/cris/include/arch-v10/arch/ptrace.h
index 2f464ea..28be57c 100644
--- a/arch/cris/include/arch-v10/arch/ptrace.h
+++ b/arch/cris/include/arch-v10/arch/ptrace.h
@@ -114,6 +114,86 @@ struct switch_stack {
#define profile_pc(regs) instruction_pointer(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) "move.d $" #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(frametype)
+ PTREG_SAVE(orig_r10)
+ PTREGS_SAVE_R(13)
+ PTREGS_SAVE_R(12)
+ PTREGS_SAVE_R(11)
+ PTREGS_SAVE_R(10)
+ PTREGS_SAVE_R(9)
+ PTREGS_SAVE_R(8)
+ PTREGS_SAVE_R(7)
+ PTREGS_SAVE_R(6)
+ PTREGS_SAVE_R(5)
+ PTREGS_SAVE_R(4)
+ PTREGS_SAVE_R(3)
+ PTREGS_SAVE_R(2)
+ PTREGS_SAVE_R(1)
+ PTREGS_SAVE_R(0)
+ PTREG_SAVE(mof)
+ PTREG_SAVE(dccr)
+ PTREG_SAVE(srp)
+ PTREG_SAVE(irp)
+ PTREG_SAVE(csrinstr)
+ PTREG_SAVE(csraddr)
+ PTREG_SAVE(csrdata)
+ "1:\n"
+ "move.d 1b, r0\n"
+ PTREG_SAVE(r0, irp)
+ :
+ PTREG_OUT(regs, frametype, frametype),
+ PTREG_OUT(regs, orig_r10, orig_r10),
+ PTREG_OUT_I(regs, 13),
+ PTREG_OUT_I(regs, 12),
+ PTREG_OUT_I(regs, 11),
+ PTREG_OUT_I(regs, 10),
+ PTREG_OUT_I(regs, 9),
+ PTREG_OUT_I(regs, 8),
+ PTREG_OUT_I(regs, 7),
+ PTREG_OUT_I(regs, 6),
+ PTREG_OUT_I(regs, 5),
+ PTREG_OUT_I(regs, 4),
+ PTREG_OUT_I(regs, 3),
+ PTREG_OUT_I(regs, 2),
+ PTREG_OUT_I(regs, 1),
+ PTREG_OUT_I(regs, 0),
+ PTREG_OUT(regs, mof, mof),
+ PTREG_OUT(regs, dccr, dccr),
+ PTREG_OUT(regs, srp, srp),
+ PTREG_OUT(regs, irp, irp),
+ PTREG_OUT(regs, csrinstr, csrinstr),
+ PTREG_OUT(regs, csraddr, csraddr),
+ PTREG_OUT(regs, csrdata, csrdata)
+ :
+ "r0"
+ );
+
+ return regs;
+}
#endif /* __KERNEL__ */

#endif
diff --git a/arch/cris/include/arch-v32/arch/ptrace.h b/arch/cris/include/arch-v32/arch/ptrace.h
index ffca8d0..90ad6b1 100644
--- a/arch/cris/include/arch-v32/arch/ptrace.h
+++ b/arch/cris/include/arch-v32/arch/ptrace.h
@@ -114,6 +114,90 @@ struct switch_stack {
extern void show_regs(struct pt_regs *);
#define profile_pc(regs) instruction_pointer(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) "move.d $" #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(frametype)
+ PTREG_SAVE(orig_r10)
+ PTREGS_SAVE_R(13)
+ PTREGS_SAVE_R(12)
+ PTREGS_SAVE_R(11)
+ PTREGS_SAVE_R(10)
+ PTREGS_SAVE_R(9)
+ PTREGS_SAVE_R(8)
+ PTREGS_SAVE_R(7)
+ PTREGS_SAVE_R(6)
+ PTREGS_SAVE_R(5)
+ PTREGS_SAVE_R(4)
+ PTREGS_SAVE_R(3)
+ PTREGS_SAVE_R(2)
+ PTREGS_SAVE_R(1)
+ PTREGS_SAVE_R(0)
+ PTREG_SAVE(acr)
+ PTREG_SAVE(srs)
+ PTREG_SAVE(mof)
+ PTREG_SAVE(spc)
+ PTREG_SAVE(ccs)
+ PTREG_SAVE(srp)
+ PTREG_SAVE(erp)
+ PTREG_SAVE(exs)
+ PTREG_SAVE(eda)
+ "1:\n"
+ "move.d 1b, r0\n"
+ PTREG_SAVE(r0, irp)
+ :
+ PTREG_OUT(regs, frametype, frametype),
+ PTREG_OUT(regs, orig_r10, orig_r10),
+ PTREG_OUT_I(regs, 0),
+ PTREG_OUT_I(regs, 1),
+ PTREG_OUT_I(regs, 2),
+ PTREG_OUT_I(regs, 3),
+ PTREG_OUT_I(regs, 4),
+ PTREG_OUT_I(regs, 5),
+ PTREG_OUT_I(regs, 6),
+ PTREG_OUT_I(regs, 7),
+ PTREG_OUT_I(regs, 8),
+ PTREG_OUT_I(regs, 9),
+ PTREG_OUT_I(regs, 10),
+ PTREG_OUT_I(regs, 11),
+ PTREG_OUT_I(regs, 12),
+ PTREG_OUT_I(regs, 13),
+ PTREG_OUT(regs, acr, acr),
+ PTREG_OUT(regs, srs, srs),
+ PTREG_OUT(regs, mof, mof),
+ PTREG_OUT(regs, spc, spc),
+ PTREG_OUT(regs, ccs, ccs),
+ PTREG_OUT(regs, srp, srp),
+ PTREG_OUT(regs, erp, erp),
+ PTREG_OUT(regs, exs, exs),
+ PTREG_OUT(regs, eda, eda)
+ :
+ "r0"
+ );
+
+ return regs;
+}
#endif /* __KERNEL__ */

#endif

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