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Date: Sun, 11 Apr 2010 23:03:45 -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 3/23] Make register values available to ARM panic notifiers
The save_ptregs() functions compiles cleanly, but has not been tested.
Signed-off-by: David VomLehn <dvomlehn@...co.com>
---
arch/arm/include/asm/ptrace.h | 75 +++++++++++++++++++++++++++++++++++++++++
arch/arm/kernel/traps.c | 4 +-
2 files changed, 77 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/ptrace.h b/arch/arm/include/asm/ptrace.h
index 9dcb11e..b9a0488 100644
--- a/arch/arm/include/asm/ptrace.h
+++ b/arch/arm/include/asm/ptrace.h
@@ -184,6 +184,81 @@ extern unsigned long profile_pc(struct pt_regs *regs);
#define predicate(x) ((x) & 0xf0000000)
#define PREDICATE_ALWAYS 0xe0000000
+/* Macros for saving the contents of registers and for the output constraint
+ * for those registers */
+#include <linux/ptreg.h>
+#define PTREG_SAVE(r, name) "str " #r ", %[" #name "]\n"
+#define PTREG_SAVE_R(i) _PTREG_SAVE_IDX(r, r, i)
+
+#define PTREG_OUT_R(regs, i) _PTREG_OUT_IDX(regs, uregs, 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__ (
+ /*
+ * I think ARM has an instruction to store multiple
+ * registers it would be nice to use that
+ */
+ 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(fp, fp)
+ PTREG_SAVE(ip, ip)
+ PTREG_SAVE(sp, sp)
+ PTREG_SAVE(lr, lr)
+
+ "mrs r0, cpsr\n"
+ PTREG_SAVE(r0, cpsr)
+
+ "1:\n"
+ "adr 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(regs, ARM_fp, fp),
+ PTREG_OUT(regs, ARM_ip, ip),
+ PTREG_OUT(regs, ARM_sp, sp),
+ PTREG_OUT(regs, ARM_lr, lr),
+ PTREG_OUT(regs, ARM_pc, pc),
+ PTREG_OUT(regs, ARM_cpsr, cpsr)
+ :
+ :
+ "r0"
+ );
+
+ return regs;
+}
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 1621e53..128be0f 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -282,9 +282,9 @@ void die(const char *str, struct pt_regs *regs, int err)
oops_exit();
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");
if (ret != NOTIFY_STOP)
do_exit(SIGSEGV);
}
--
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