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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/s390/include/asm/ptrace.h | 94 ++++++++++++++++++++++++++++++++++++++++
arch/s390/kernel/traps.c | 4 +-
2 files changed, 96 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h
index fef9b33..6665159 100644
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -507,6 +507,100 @@ static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
return regs->gprs[15] & PSW_ADDR_INSN;
}

+
+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+#include "/home/vomlehn/git/kernel.org/ptreg.h"
+#ifndef CONFIG_64BIT
+#define PTREG_SAVE(r, name) "st " #r ", %[" #name "]\n"
+#else
+#define PTREG_SAVE(r, name) "stg " #r ", %[" #name "]\n"
+#endif
+
+#define PTREG_SAVE_GPR(i) PTREG_SAVE_I(gprs, r, i)
+#define PTREG_SAVE_ARG(i) PTREG_SAVE_I(args, r, i)
+
+#define PTREG_SAVE_R(regs, i) PTREG_SAVE_I(regs, gprs, r, i)
+#define PTREG_SAVE_ARG(regs, i) PTREG_SAVE_I(regs, arg, 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_ARG(0)
+ PTREG_SAVE(psw, psw)
+ PTREG_SAVE_GPR(0)
+ PTREG_SAVE_GPR(1)
+ PTREG_SAVE_GPR(2)
+ PTREG_SAVE_GPR(3)
+ PTREG_SAVE_GPR(4)
+ PTREG_SAVE_GPR(5)
+ PTREG_SAVE_GPR(6)
+ PTREG_SAVE_GPR(7)
+ PTREG_SAVE_GPR(8)
+ PTREG_SAVE_GPR(9)
+ PTREG_SAVE_GPR(10)
+ PTREG_SAVE_GPR(11)
+ PTREG_SAVE_GPR(12)
+ PTREG_SAVE_GPR(13)
+ PTREG_SAVE_GPR(14)
+ PTREG_SAVE_GPR(15)
+ PTREG_SAVE(orig_gpr2, orig_gpr2)
+ PTREG_SAVE(svcnr, svcnr)
+ PTREG_SAVE(ilc, ilc)
+ /*
+ * The current location is the one for which the register
+ * values are correct, even if some had been modified on
+ * function entry. So, the current location is the value to
+ * save as the execution address.
+ */
+#ifndef CONFIG_64BIT
+ "basr 1, 0\n"
+ "0:\n"
+ "ahi 1, 1b\n"
+#else
+ "lalr 1, 1b\n"
+#endif
+ PTREG_SAVE(1, ilc)
+ :
+ PTREG_OUT(regs, psw, psw),
+ PTREG_OUT_GPR(regs, 0),
+ PTREG_OUT_GPR(regs, 1),
+ PTREG_OUT_GPR(regs, 2),
+ PTREG_OUT_GPR(regs, 3),
+ PTREG_OUT_GPR(regs, 4),
+ PTREG_OUT_GPR(regs, 5),
+ PTREG_OUT_GPR(regs, 6),
+ PTREG_OUT_GPR(regs, 7),
+ PTREG_OUT_GPR(regs, 8),
+ PTREG_OUT_GPR(regs, 9),
+ PTREG_OUT_GPR(regs, 10),
+ PTREG_OUT_GPR(regs, 11),
+ PTREG_OUT_GPR(regs, 12),
+ PTREG_OUT_GPR(regs, 13),
+ PTREG_OUT_GPR(regs, 14),
+ PTREG_OUT_GPR(regs, 15),
+ PTREG_OUT(regs, orig_gpr2, orig_gpr2),
+ PTREG_OUT(regs, svcnr, svcnr),
+ PTREG_OUT(regs, ilc, ilc)
+ :
+ "r1"
+ );
+
+ return regs;
+}
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 6e7ad63..49eacce 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -308,9 +308,9 @@ void die(const char * str, struct pt_regs * regs, long err)
add_taint(TAINT_DIE);
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_on_oops");
+ panic_with_regs(regs, "Fatal exception: panic_on_oops");
oops_exit();
do_exit(SIGSEGV);
}
--
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Prev: [PATCH 7/23] Make register values available to FRV panic notifiers
Next: [PATCH 2/23] Make register values available to Alpha panic notifiers