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Date: Sun, 11 Apr 2010 23:04:52 -0700
From: David VomLehn <dvomlehn@...co.com>
To: to@...mlehn-lnx2.corp.sa.net,
"linux_arch"@dvomlehn-lnx2.corp.sa.net,
linux_arch@...mlehn-lnx2.corp.sa.net
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
maint_arch@...mlehn-lnx2.corp.sa.net
Subject: [PATCH 23/23] Make register values available to Xtensa 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@...co.com>
---
arch/xtensa/include/asm/ptrace.h | 93 ++++++++++++++++++++++++++++++++++++++
arch/xtensa/kernel/traps.c | 4 +-
2 files changed, 95 insertions(+), 2 deletions(-)
diff --git a/arch/xtensa/include/asm/ptrace.h b/arch/xtensa/include/asm/ptrace.h
index 905e1e6..56d5721 100644
--- a/arch/xtensa/include/asm/ptrace.h
+++ b/arch/xtensa/include/asm/ptrace.h
@@ -130,6 +130,99 @@ extern void show_regs(struct pt_regs *);
#endif /* !__ASSEMBLY__ */
+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+#define PTREG_SAVE(r, name) "movel " #r ", %[" #name "]\n"
+#define PTREG_SAVE_R(r) PTREG_SAVE_I(r, r, i)
+
+#define PTREG_OUT_R(regs, i) PTREG_OUT_I(regs, 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(pc, pc)
+ PTREG_SAVE(ps, ps)
+ PTREG_SAVE(depc, depc)
+ PTREG_SAVE(exccause, exccause)
+ PTREG_SAVE(excvaddr, excvaddr)
+ PTREG_SAVE(debugcause, debugcause)
+ PTREG_SAVE(wmask, wmask)
+ PTREG_SAVE(lbeg, lbeg)
+ PTREG_SAVE(lend, lend)
+ PTREG_SAVE(lcount, lcount)
+ PTREG_SAVE(sar, sar)
+ PTREG_SAVE(windowbase, windowbase)
+ PTREG_SAVE(windowstart, windowstart)
+ PTREG_SAVE(syscall, syscall)
+ PTREG_SAVE(icountlevel, icountlevel)
+ /* Don't know how to handle xtregs_opt_t definitions */
+ 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_OUT(regs, pc, pc),
+ PTREG_OUT(regs, ps, ps),
+ PTREG_OUT(regs, depc, depc),
+ PTREG_OUT(regs, exccause, exccause),
+ PTREG_OUT(regs, excvaddr, excvaddr),
+ PTREG_OUT(regs, debugcause, debugcause),
+ PTREG_OUT(regs, wmask, wmask),
+ PTREG_OUT(regs, lbeg, lbeg),
+ PTREG_OUT(regs, lend, lend),
+ PTREG_OUT(regs, lcount, lcount),
+ PTREG_OUT(regs, sar, sar),
+ PTREG_OUT(regs, windowbase, windowbase),
+ PTREG_OUT(regs, windowstart, windowstart),
+ PTREG_OUT(regs, syscall, syscall),
+ PTREG_OUT(regs, icountlevel, icountlevel),
+ /* Don't know how to handle xtregs_opt_t definitions */
+ 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)
+ :
+ );
+
+ return regs;
+}
#endif /* __KERNEL__ */
#endif /* _XTENSA_PTRACE_H */
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index e64efac..3441d54 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -497,10 +497,10 @@ void die(const char * str, struct pt_regs * regs, long err)
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_with_regs(regs, "Fatal exception");
do_exit(err);
}
--
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