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[PATCH] powerpc: Fix kdump copy regs and dynamic allocate per-cpu crash notes

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- This contains the arch specific changes for the following the
kdump generic fixes which were already accepted in the upstream.
       .   Capturing CPU registers (for the case of 'panic' and invoking
the dump using 'sysrq-trigger') from a function (stack frame) which will
be not be available during the kdump boot. Hence, might result in
invalid stack trace.
       .   Dynamically allocating per cpu ELF notes section instead of
statically for NR_CPUS.

- Fix the compiler warning in prom_init.c.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Haren Myneni
2006-01-13 19:15:36 -08:00
committed by Paul Mackerras
parent 9216ad8cb7
commit 8385a6a3ac
3 changed files with 80 additions and 85 deletions
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77
arch/powerpc/kernel/crash.c
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@ -84,7 +84,10 @@ static void crash_save_this_cpu(struct pt_regs *regs, int cpu)
* squirrelled away. ELF notes happen to provide
* all of that that no need to invent something new.
*/
buf = &crash_notes[cpu][0];
buf = (u32*)per_cpu_ptr(crash_notes, cpu);
if (!buf)
return;
memset(&prstatus, 0, sizeof(prstatus));
prstatus.pr_pid = current->pid;
elf_core_copy_regs(&prstatus.pr_reg, regs);
@ -93,76 +96,6 @@ static void crash_save_this_cpu(struct pt_regs *regs, int cpu)
final_note(buf);
}
/* FIXME Merge this with xmon_save_regs ?? */
static inline void crash_get_current_regs(struct pt_regs *regs)
{
unsigned long tmp1, tmp2;
__asm__ __volatile__ (
"std 0,0(%2)\n"
"std 1,8(%2)\n"
"std 2,16(%2)\n"
"std 3,24(%2)\n"
"std 4,32(%2)\n"
"std 5,40(%2)\n"
"std 6,48(%2)\n"
"std 7,56(%2)\n"
"std 8,64(%2)\n"
"std 9,72(%2)\n"
"std 10,80(%2)\n"
"std 11,88(%2)\n"
"std 12,96(%2)\n"
"std 13,104(%2)\n"
"std 14,112(%2)\n"
"std 15,120(%2)\n"
"std 16,128(%2)\n"
"std 17,136(%2)\n"
"std 18,144(%2)\n"
"std 19,152(%2)\n"
"std 20,160(%2)\n"
"std 21,168(%2)\n"
"std 22,176(%2)\n"
"std 23,184(%2)\n"
"std 24,192(%2)\n"
"std 25,200(%2)\n"
"std 26,208(%2)\n"
"std 27,216(%2)\n"
"std 28,224(%2)\n"
"std 29,232(%2)\n"
"std 30,240(%2)\n"
"std 31,248(%2)\n"
"mfmsr %0\n"
"std %0, 264(%2)\n"
"mfctr %0\n"
"std %0, 280(%2)\n"
"mflr %0\n"
"std %0, 288(%2)\n"
"bl 1f\n"
"1: mflr %1\n"
"std %1, 256(%2)\n"
"mtlr %0\n"
"mfxer %0\n"
"std %0, 296(%2)\n"
: "=&r" (tmp1), "=&r" (tmp2)
: "b" (regs));
}
/* 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();
if (saved_regs)
memcpy(&regs, saved_regs, sizeof(regs));
else
crash_get_current_regs(&regs);
crash_save_this_cpu(&regs, cpu);
}
#ifdef CONFIG_SMP
static atomic_t waiting_for_crash_ipi;
@ -260,5 +193,5 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
*/
crashing_cpu = smp_processor_id();
crash_kexec_prepare_cpus();
crash_save_self(regs);
crash_save_this_cpu(regs, crashing_cpu);
}