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authorAlexander Nyberg <alexn@telia.com>2005-06-25 14:58:26 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 16:24:54 -0700
commit6e274d144302068a00794ec22e73520c0615cb6f (patch)
treef7ea59ea47d3c5676fbac8d39e8deaa1f94146ae
parent86b1ae38c0a62409dc862a28e3f08920f55f944b (diff)
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[PATCH] kdump: Use real pt_regs from exception
Makes kexec_crashdump() take a pt_regs * as an argument. This allows to get exact register state at the point of the crash. If we come from direct panic assertion NULL will be passed and the current registers saved before crashdump. This hooks into two places: die(): check the conditions under which we will panic when calling do_exit and go there directly with the pt_regs that caused the fatal fault. die_nmi(): If we receive an NMI lockup while in the kernel use the pt_regs and go directly to crash_kexec(). We're probably nested up badly at this point so this might be the only chance to escape with proper information. Signed-off-by: Alexander Nyberg <alexn@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/kernel/crash.c36
-rw-r--r--arch/i386/kernel/traps.c17
-rw-r--r--arch/ppc/kernel/machine_kexec.c2
-rw-r--r--arch/ppc64/kernel/machine_kexec.c2
-rw-r--r--arch/s390/kernel/crash.c2
-rw-r--r--arch/x86_64/kernel/crash.c2
-rw-r--r--drivers/char/sysrq.c2
-rw-r--r--include/linux/kexec.h8
-rw-r--r--include/linux/reboot.h3
-rw-r--r--kernel/kexec.c13
-rw-r--r--kernel/panic.c2
11 files changed, 66 insertions, 23 deletions
diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c
index a021681d21f..8bdb4b6af0f 100644
--- a/arch/i386/kernel/crash.c
+++ b/arch/i386/kernel/crash.c
@@ -100,12 +100,31 @@ static void crash_get_current_regs(struct pt_regs *regs)
regs->eip = (unsigned long)current_text_addr();
}
-static void crash_save_self(void)
+/* CPU does not save ss and esp on stack if execution is already
+ * running in kernel mode at the time of NMI occurrence. This code
+ * fixes it.
+ */
+static void crash_setup_regs(struct pt_regs *newregs, struct pt_regs *oldregs)
+{
+ memcpy(newregs, oldregs, sizeof(*newregs));
+ newregs->esp = (unsigned long)&(oldregs->esp);
+ __asm__ __volatile__("xorl %eax, %eax;");
+ __asm__ __volatile__ ("movw %%ss, %%ax;" :"=a"(newregs->xss));
+}
+
+/* We may have saved_regs from where the error came from
+ * or it is NULL if via a direct panic().
+ */
+static void crash_save_self(struct pt_regs *saved_regs)
{
struct pt_regs regs;
int cpu;
cpu = smp_processor_id();
- crash_get_current_regs(&regs);
+
+ if (saved_regs)
+ crash_setup_regs(&regs, saved_regs);
+ else
+ crash_get_current_regs(&regs);
crash_save_this_cpu(&regs, cpu);
}
@@ -124,15 +143,8 @@ static int crash_nmi_callback(struct pt_regs *regs, int cpu)
return 1;
local_irq_disable();
- /* CPU does not save ss and esp on stack if execution is already
- * running in kernel mode at the time of NMI occurrence. This code
- * fixes it.
- */
if (!user_mode(regs)) {
- memcpy(&fixed_regs, regs, sizeof(*regs));
- fixed_regs.esp = (unsigned long)&(regs->esp);
- __asm__ __volatile__("xorl %eax, %eax;");
- __asm__ __volatile__ ("movw %%ss, %%ax;" :"=a"(fixed_regs.xss));
+ crash_setup_regs(&fixed_regs, regs);
regs = &fixed_regs;
}
crash_save_this_cpu(regs, cpu);
@@ -184,7 +196,7 @@ static void nmi_shootdown_cpus(void)
}
#endif
-void machine_crash_shutdown(void)
+void machine_crash_shutdown(struct pt_regs *regs)
{
/* This function is only called after the system
* has paniced or is otherwise in a critical state.
@@ -204,5 +216,5 @@ void machine_crash_shutdown(void)
#if defined(CONFIG_X86_IO_APIC)
disable_IO_APIC();
#endif
- crash_save_self();
+ crash_save_self(regs);
}
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 207ea8ba716..e458463ebc0 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -27,6 +27,7 @@
#include <linux/ptrace.h>
#include <linux/utsname.h>
#include <linux/kprobes.h>
+#include <linux/kexec.h>
#ifdef CONFIG_EISA
#include <linux/ioport.h>
@@ -294,6 +295,9 @@ bug:
printk("Kernel BUG\n");
}
+/* This is gone through when something in the kernel
+ * has done something bad and is about to be terminated.
+*/
void die(const char * str, struct pt_regs * regs, long err)
{
static struct {
@@ -341,6 +345,10 @@ void die(const char * str, struct pt_regs * regs, long err)
bust_spinlocks(0);
die.lock_owner = -1;
spin_unlock_irq(&die.lock);
+
+ if (kexec_should_crash(current))
+ crash_kexec(regs);
+
if (in_interrupt())
panic("Fatal exception in interrupt");
@@ -570,6 +578,15 @@ void die_nmi (struct pt_regs *regs, const char *msg)
console_silent();
spin_unlock(&nmi_print_lock);
bust_spinlocks(0);
+
+ /* If we are in kernel we are probably nested up pretty bad
+ * and might aswell get out now while we still can.
+ */
+ if (!user_mode(regs)) {
+ current->thread.trap_no = 2;
+ crash_kexec(regs);
+ }
+
do_exit(SIGSEGV);
}
diff --git a/arch/ppc/kernel/machine_kexec.c b/arch/ppc/kernel/machine_kexec.c
index 435ad9ea0a8..b82535357d6 100644
--- a/arch/ppc/kernel/machine_kexec.c
+++ b/arch/ppc/kernel/machine_kexec.c
@@ -34,7 +34,7 @@ void machine_shutdown(void)
}
}
-void machine_crash_shutdown(void)
+void machine_crash_shutdown(struct pt_regs *regs)
{
if (ppc_md.machine_crash_shutdown) {
ppc_md.machine_crash_shutdown();
diff --git a/arch/ppc64/kernel/machine_kexec.c b/arch/ppc64/kernel/machine_kexec.c
index 217965d60a4..06b25b59c8a 100644
--- a/arch/ppc64/kernel/machine_kexec.c
+++ b/arch/ppc64/kernel/machine_kexec.c
@@ -34,7 +34,7 @@ note_buf_t crash_notes[NR_CPUS];
* and if what it will achieve. Letting it be now to compile the code
* in generic kexec environment
*/
-void machine_crash_shutdown(void)
+void machine_crash_shutdown(struct pt_regs *regs)
{
/* do nothing right now */
/* smp_relase_cpus() if we want smp on panic kernel */
diff --git a/arch/s390/kernel/crash.c b/arch/s390/kernel/crash.c
index db38283c1f2..7bd169c58b0 100644
--- a/arch/s390/kernel/crash.c
+++ b/arch/s390/kernel/crash.c
@@ -12,6 +12,6 @@
note_buf_t crash_notes[NR_CPUS];
-void machine_crash_shutdown(void)
+void machine_crash_shutdown(struct pt_regs *regs)
{
}
diff --git a/arch/x86_64/kernel/crash.c b/arch/x86_64/kernel/crash.c
index 6183bcb8525..d7fa4248501 100644
--- a/arch/x86_64/kernel/crash.c
+++ b/arch/x86_64/kernel/crash.c
@@ -22,7 +22,7 @@
note_buf_t crash_notes[NR_CPUS];
-void machine_crash_shutdown(void)
+void machine_crash_shutdown(struct pt_regs *regs)
{
/* This function is only called after the system
* has paniced or is otherwise in a critical state.
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 53b2c8fab00..af79805b557 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -100,7 +100,7 @@ static struct sysrq_key_op sysrq_unraw_op = {
static void sysrq_handle_crashdump(int key, struct pt_regs *pt_regs,
struct tty_struct *tty)
{
- crash_kexec();
+ crash_kexec(pt_regs);
}
static struct sysrq_key_op sysrq_crashdump_op = {
.handler = sysrq_handle_crashdump,
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0653a27c3d7..7383173a3a9 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -99,7 +99,8 @@ extern asmlinkage long compat_sys_kexec_load(unsigned long entry,
unsigned long flags);
#endif
extern struct page *kimage_alloc_control_pages(struct kimage *image, unsigned int order);
-extern void crash_kexec(void);
+extern void crash_kexec(struct pt_regs *);
+int kexec_should_crash(struct task_struct *);
extern struct kimage *kexec_image;
#define KEXEC_ON_CRASH 0x00000001
@@ -123,6 +124,9 @@ extern struct kimage *kexec_image;
extern struct resource crashk_res;
#else /* !CONFIG_KEXEC */
-static inline void crash_kexec(void) { }
+struct pt_regs;
+struct task_struct;
+static inline void crash_kexec(struct pt_regs *regs) { }
+static inline int kexec_should_crash(struct task_struct *p) { return 0; }
#endif /* CONFIG_KEXEC */
#endif /* LINUX_KEXEC_H */
diff --git a/include/linux/reboot.h b/include/linux/reboot.h
index c5a05e16edb..2d4dd23168d 100644
--- a/include/linux/reboot.h
+++ b/include/linux/reboot.h
@@ -52,7 +52,8 @@ extern void machine_halt(void);
extern void machine_power_off(void);
extern void machine_shutdown(void);
-extern void machine_crash_shutdown(void);
+struct pt_regs;
+extern void machine_crash_shutdown(struct pt_regs *);
#endif
diff --git a/kernel/kexec.c b/kernel/kexec.c
index a0411b3bd54..277f22afe74 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -18,6 +18,8 @@
#include <linux/reboot.h>
#include <linux/syscalls.h>
#include <linux/ioport.h>
+#include <linux/hardirq.h>
+
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -32,6 +34,13 @@ struct resource crashk_res = {
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
+int kexec_should_crash(struct task_struct *p)
+{
+ if (in_interrupt() || !p->pid || p->pid == 1 || panic_on_oops)
+ return 1;
+ return 0;
+}
+
/*
* When kexec transitions to the new kernel there is a one-to-one
* mapping between physical and virtual addresses. On processors
@@ -1010,7 +1019,7 @@ asmlinkage long compat_sys_kexec_load(unsigned long entry,
}
#endif
-void crash_kexec(void)
+void crash_kexec(struct pt_regs *regs)
{
struct kimage *image;
int locked;
@@ -1028,7 +1037,7 @@ void crash_kexec(void)
if (!locked) {
image = xchg(&kexec_crash_image, NULL);
if (image) {
- machine_crash_shutdown();
+ machine_crash_shutdown(regs);
machine_kexec(image);
}
xchg(&kexec_lock, 0);
diff --git a/kernel/panic.c b/kernel/panic.c
index 66f43d33cd8..74ba5f3e46c 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -83,7 +83,7 @@ NORET_TYPE void panic(const char * fmt, ...)
* everything else.
* Do we want to call this before we try to display a message?
*/
- crash_kexec();
+ crash_kexec(NULL);
#ifdef CONFIG_SMP
/*