[PATCH 9/23] Make register values available to IA64 panic notifiers

From: David VomLehn
Date: Mon Apr 12 2010 - 02:04:16 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/ia64/include/asm/ptrace.h | 124 ++++++++++++++++++++++++++++++++++++++++
arch/ia64/kernel/traps.c | 2 +-
2 files changed, 125 insertions(+), 1 deletions(-)

diff --git a/arch/ia64/include/asm/ptrace.h b/arch/ia64/include/asm/ptrace.h
index 14055c6..4d39be8 100644
--- a/arch/ia64/include/asm/ptrace.h
+++ b/arch/ia64/include/asm/ptrace.h
@@ -325,6 +325,130 @@ static inline unsigned long user_stack_pointer(struct pt_regs *regs)
#define arch_has_block_step() (1)
extern void user_enable_block_step(struct task_struct *);

+/* 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) "st8 %[" #name "] = " #r "\n"
+#define PTREG_SAVE_R(i) PTREG_SAVE_I(r, r, i)
+#define PTREG_SAVE_B(i) PTREG_SAVE_I(b, b, i)
+
+#define PTREG_OUT_R(regs, i) PTREG_OUT_I(regs, r, r, i)
+#define PTREG_OUT_B(regs, i) PTREG_OUT_I(regs, b, b, 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_B(6)
+ PTREG_SAVE_B(7)
+ PTREG_SAVE(ar_csd, ar_csd)
+ PTREG_SAVE(ar_ssd, ar_ssd)
+ PTREG_SAVE_R(8)
+ PTREG_SAVE_R(9)
+ PTREG_SAVE_R(10)
+ PTREG_SAVE_R(11)
+ PTREG_SAVE(cr_ipsr, cr_ipsr)
+ PTREG_SAVE(cr_iip, cr_iip)
+ PTREG_SAVE(cr_ifs, cr_ifs)
+ PTREG_SAVE(ar_unat, ar_unat)
+ PTREG_SAVE(ar_pfs, ar_pfs)
+ PTREG_SAVE(ar_rsc, ar_rsc)
+ PTREG_SAVE(ar_rnat, ar_rnat)
+ PTREG_SAVE(ar_bspstore, ar_bspstore)
+ PTREG_SAVE(pr, pr)
+ PTREG_SAVE_B(0)
+ PTREG_SAVE(loadrs, loadrs)
+ PTREG_SAVE_R(1)
+ PTREG_SAVE_R(12)
+ PTREG_SAVE_R(13)
+ PTREG_SAVE(ar_fpsr, ar_fpsr)
+ PTREG_SAVE_R(15)
+ PTREG_SAVE_R(14)
+ PTREG_SAVE_R(2)
+ PTREG_SAVE_R(3)
+ 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(ar_ccv, ar_ccv)
+ '1:\n"
+ "movl r0=1b\n"
+ PTREG_SAVE(r0, pc)
+ :
+ PTREG_OUT_B(regs, 6)
+ PTREG_OUT_B(regs, 7)
+ PTREG_OUT(regs, ar_csd, ar_csd)
+ PTREG_OUT(regs, ar_ssd, ar_ssd)
+ PTREG_OUT_R(regs, 8)
+ PTREG_OUT_R(regs, 9)
+ PTREG_OUT_R(regs, 10)
+ PTREG_OUT_R(regs, 11)
+ PTREG_OUT(regs, cr_ipsr, cr_ipsr)
+ PTREG_OUT(regs, cr_iip, cr_iip)
+ PTREG_OUT(regs, cr_ifs, cr_ifs)
+ PTREG_OUT(regs, ar_unat, ar_unat)
+ PTREG_OUT(regs, ar_pfs, ar_pfs)
+ PTREG_OUT(regs, ar_rsc, ar_rsc)
+ PTREG_OUT(regs, ar_rnat, ar_rnat)
+ PTREG_OUT(regs, ar_bspstore, ar_bspstore)
+ PTREG_OUT(regs, pr, pr)
+ PTREG_OUT_B(regs, 0)
+ PTREG_OUT(regs, loadrs, loadrs)
+ PTREG_OUT_R(regs, 1)
+ PTREG_OUT_R(regs, 12)
+ PTREG_OUT_R(regs, 13)
+ PTREG_OUT(regs, ar_fpsr, ar_fpsr)
+ PTREG_OUT_R(regs, 15)
+ PTREG_OUT_R(regs, 14)
+ PTREG_OUT_R(regs, 2)
+ PTREG_OUT_R(regs, 3)
+ 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, ar_ccv, ar_ccv)
+ :
+ "r0"
+ );
+
+ return regs;
+}
#endif /* !__KERNEL__ */

/* pt_all_user_regs is used for PTRACE_GETREGS PTRACE_SETREGS */
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index f0cda76..541ea2f 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -79,7 +79,7 @@ die (const char *str, struct pt_regs *regs, long err)
return 1;

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

do_exit(SIGSEGV);
return 0;
--
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