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[IA64] Restore registers in the stack on INIT
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Registers are not saved anywhere when INIT comes during fsys mode and
we cannot know what happened when we investigate vmcore captured by
kdump. This patch adds new function finish_pt_regs() so registers can
be saved in such a case.

Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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Takao Indoh authored and Tony Luck committed Oct 13, 2009
1 parent 2caa731 commit 29e4e02
Showing 1 changed file with 57 additions and 47 deletions.
104 changes: 57 additions & 47 deletions arch/ia64/kernel/mca.c
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Original file line number Diff line number Diff line change
Expand Up @@ -887,6 +887,60 @@ ia64_mca_modify_comm(const struct task_struct *previous_current)
memcpy(current->comm, comm, sizeof(current->comm));
}

static void
finish_pt_regs(struct pt_regs *regs, const pal_min_state_area_t *ms,
unsigned long *nat)
{
const u64 *bank;

/* If ipsr.ic then use pmsa_{iip,ipsr,ifs}, else use
* pmsa_{xip,xpsr,xfs}
*/
if (ia64_psr(regs)->ic) {
regs->cr_iip = ms->pmsa_iip;
regs->cr_ipsr = ms->pmsa_ipsr;
regs->cr_ifs = ms->pmsa_ifs;
} else {
regs->cr_iip = ms->pmsa_xip;
regs->cr_ipsr = ms->pmsa_xpsr;
regs->cr_ifs = ms->pmsa_xfs;
}
regs->pr = ms->pmsa_pr;
regs->b0 = ms->pmsa_br0;
regs->ar_rsc = ms->pmsa_rsc;
copy_reg(&ms->pmsa_gr[1-1], ms->pmsa_nat_bits, &regs->r1, nat);
copy_reg(&ms->pmsa_gr[2-1], ms->pmsa_nat_bits, &regs->r2, nat);
copy_reg(&ms->pmsa_gr[3-1], ms->pmsa_nat_bits, &regs->r3, nat);
copy_reg(&ms->pmsa_gr[8-1], ms->pmsa_nat_bits, &regs->r8, nat);
copy_reg(&ms->pmsa_gr[9-1], ms->pmsa_nat_bits, &regs->r9, nat);
copy_reg(&ms->pmsa_gr[10-1], ms->pmsa_nat_bits, &regs->r10, nat);
copy_reg(&ms->pmsa_gr[11-1], ms->pmsa_nat_bits, &regs->r11, nat);
copy_reg(&ms->pmsa_gr[12-1], ms->pmsa_nat_bits, &regs->r12, nat);
copy_reg(&ms->pmsa_gr[13-1], ms->pmsa_nat_bits, &regs->r13, nat);
copy_reg(&ms->pmsa_gr[14-1], ms->pmsa_nat_bits, &regs->r14, nat);
copy_reg(&ms->pmsa_gr[15-1], ms->pmsa_nat_bits, &regs->r15, nat);
if (ia64_psr(regs)->bn)
bank = ms->pmsa_bank1_gr;
else
bank = ms->pmsa_bank0_gr;
copy_reg(&bank[16-16], ms->pmsa_nat_bits, &regs->r16, nat);
copy_reg(&bank[17-16], ms->pmsa_nat_bits, &regs->r17, nat);
copy_reg(&bank[18-16], ms->pmsa_nat_bits, &regs->r18, nat);
copy_reg(&bank[19-16], ms->pmsa_nat_bits, &regs->r19, nat);
copy_reg(&bank[20-16], ms->pmsa_nat_bits, &regs->r20, nat);
copy_reg(&bank[21-16], ms->pmsa_nat_bits, &regs->r21, nat);
copy_reg(&bank[22-16], ms->pmsa_nat_bits, &regs->r22, nat);
copy_reg(&bank[23-16], ms->pmsa_nat_bits, &regs->r23, nat);
copy_reg(&bank[24-16], ms->pmsa_nat_bits, &regs->r24, nat);
copy_reg(&bank[25-16], ms->pmsa_nat_bits, &regs->r25, nat);
copy_reg(&bank[26-16], ms->pmsa_nat_bits, &regs->r26, nat);
copy_reg(&bank[27-16], ms->pmsa_nat_bits, &regs->r27, nat);
copy_reg(&bank[28-16], ms->pmsa_nat_bits, &regs->r28, nat);
copy_reg(&bank[29-16], ms->pmsa_nat_bits, &regs->r29, nat);
copy_reg(&bank[30-16], ms->pmsa_nat_bits, &regs->r30, nat);
copy_reg(&bank[31-16], ms->pmsa_nat_bits, &regs->r31, nat);
}

/* On entry to this routine, we are running on the per cpu stack, see
* mca_asm.h. The original stack has not been touched by this event. Some of
* the original stack's registers will be in the RBS on this stack. This stack
Expand Down Expand Up @@ -921,7 +975,6 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
u64 r12 = ms->pmsa_gr[12-1], r13 = ms->pmsa_gr[13-1];
u64 ar_bspstore = regs->ar_bspstore;
u64 ar_bsp = regs->ar_bspstore + (loadrs >> 16);
const u64 *bank;
const char *msg;
int cpu = smp_processor_id();

Expand Down Expand Up @@ -1024,54 +1077,9 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
p = (char *)r12 - sizeof(*regs);
old_regs = (struct pt_regs *)p;
memcpy(old_regs, regs, sizeof(*regs));
/* If ipsr.ic then use pmsa_{iip,ipsr,ifs}, else use
* pmsa_{xip,xpsr,xfs}
*/
if (ia64_psr(regs)->ic) {
old_regs->cr_iip = ms->pmsa_iip;
old_regs->cr_ipsr = ms->pmsa_ipsr;
old_regs->cr_ifs = ms->pmsa_ifs;
} else {
old_regs->cr_iip = ms->pmsa_xip;
old_regs->cr_ipsr = ms->pmsa_xpsr;
old_regs->cr_ifs = ms->pmsa_xfs;
}
old_regs->pr = ms->pmsa_pr;
old_regs->b0 = ms->pmsa_br0;
old_regs->loadrs = loadrs;
old_regs->ar_rsc = ms->pmsa_rsc;
old_unat = old_regs->ar_unat;
copy_reg(&ms->pmsa_gr[1-1], ms->pmsa_nat_bits, &old_regs->r1, &old_unat);
copy_reg(&ms->pmsa_gr[2-1], ms->pmsa_nat_bits, &old_regs->r2, &old_unat);
copy_reg(&ms->pmsa_gr[3-1], ms->pmsa_nat_bits, &old_regs->r3, &old_unat);
copy_reg(&ms->pmsa_gr[8-1], ms->pmsa_nat_bits, &old_regs->r8, &old_unat);
copy_reg(&ms->pmsa_gr[9-1], ms->pmsa_nat_bits, &old_regs->r9, &old_unat);
copy_reg(&ms->pmsa_gr[10-1], ms->pmsa_nat_bits, &old_regs->r10, &old_unat);
copy_reg(&ms->pmsa_gr[11-1], ms->pmsa_nat_bits, &old_regs->r11, &old_unat);
copy_reg(&ms->pmsa_gr[12-1], ms->pmsa_nat_bits, &old_regs->r12, &old_unat);
copy_reg(&ms->pmsa_gr[13-1], ms->pmsa_nat_bits, &old_regs->r13, &old_unat);
copy_reg(&ms->pmsa_gr[14-1], ms->pmsa_nat_bits, &old_regs->r14, &old_unat);
copy_reg(&ms->pmsa_gr[15-1], ms->pmsa_nat_bits, &old_regs->r15, &old_unat);
if (ia64_psr(old_regs)->bn)
bank = ms->pmsa_bank1_gr;
else
bank = ms->pmsa_bank0_gr;
copy_reg(&bank[16-16], ms->pmsa_nat_bits, &old_regs->r16, &old_unat);
copy_reg(&bank[17-16], ms->pmsa_nat_bits, &old_regs->r17, &old_unat);
copy_reg(&bank[18-16], ms->pmsa_nat_bits, &old_regs->r18, &old_unat);
copy_reg(&bank[19-16], ms->pmsa_nat_bits, &old_regs->r19, &old_unat);
copy_reg(&bank[20-16], ms->pmsa_nat_bits, &old_regs->r20, &old_unat);
copy_reg(&bank[21-16], ms->pmsa_nat_bits, &old_regs->r21, &old_unat);
copy_reg(&bank[22-16], ms->pmsa_nat_bits, &old_regs->r22, &old_unat);
copy_reg(&bank[23-16], ms->pmsa_nat_bits, &old_regs->r23, &old_unat);
copy_reg(&bank[24-16], ms->pmsa_nat_bits, &old_regs->r24, &old_unat);
copy_reg(&bank[25-16], ms->pmsa_nat_bits, &old_regs->r25, &old_unat);
copy_reg(&bank[26-16], ms->pmsa_nat_bits, &old_regs->r26, &old_unat);
copy_reg(&bank[27-16], ms->pmsa_nat_bits, &old_regs->r27, &old_unat);
copy_reg(&bank[28-16], ms->pmsa_nat_bits, &old_regs->r28, &old_unat);
copy_reg(&bank[29-16], ms->pmsa_nat_bits, &old_regs->r29, &old_unat);
copy_reg(&bank[30-16], ms->pmsa_nat_bits, &old_regs->r30, &old_unat);
copy_reg(&bank[31-16], ms->pmsa_nat_bits, &old_regs->r31, &old_unat);
finish_pt_regs(old_regs, ms, &old_unat);

/* Next stack a struct switch_stack. mca_asm.S built a partial
* switch_stack, copy it and fill in the blanks using pt_regs and
Expand Down Expand Up @@ -1141,6 +1149,8 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
no_mod:
mprintk(KERN_INFO "cpu %d, %s %s, original stack not modified\n",
smp_processor_id(), type, msg);
old_unat = regs->ar_unat;
finish_pt_regs(regs, ms, &old_unat);
return previous_current;
}

Expand Down

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