Commit a67798cd authored by Martin Hicks's avatar Martin Hicks Committed by H. Peter Anvin

x86: push old stack address on irqstack for unwinder

Impact: Fixes dumpstack and KDB on 64 bits

This re-adds the old stack pointer to the top of the irqstack to help
with unwinding.  It was removed in commit d99015b1
as part of the save_args out-of-line work.

Both dumpstack and KDB require this information.
Signed-off-by: default avatarMartin Hicks <mort@sgi.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 10b888d6
...@@ -346,6 +346,7 @@ ENTRY(save_args) ...@@ -346,6 +346,7 @@ ENTRY(save_args)
popq_cfi %rax /* move return address... */ popq_cfi %rax /* move return address... */
mov %gs:pda_irqstackptr,%rsp mov %gs:pda_irqstackptr,%rsp
EMPTY_FRAME 0 EMPTY_FRAME 0
pushq_cfi %rbp /* backlink for unwinder */
pushq_cfi %rax /* ... to the new stack */ pushq_cfi %rax /* ... to the new stack */
/* /*
* We entered an interrupt context - irqs are off: * We entered an interrupt context - irqs are off:
......
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