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x86_64: fix crash on nested interrupts

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x86_64 supports 4 levels of interrupt nesting, with
the interrupt stack divided up into sub-stacks for
each nesting level.

Unfortunately, the initial interrupt stack pointer
on the first CPU was not taking into account reserved
space for guard areas, causing a stack overflow exception
when attempting to use the last interrupt nesting level,
as that page had been set up as a stack guard.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-04-30 17:20:24 -07:00 • committed by Andrew Boie
commit 0091a700d3
1 changed files with 2 additions and 1 deletions
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3
arch/x86/core/intel64/cpu.c
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@ -86,7 +86,8 @@ struct x86_cpuboot x86_cpuboot[] = {
{
.tr = X86_KERNEL_CPU0_TR,
.gs_base = &tss0,
.sp = (u64_t) z_interrupt_stacks[0] + CONFIG_ISR_STACK_SIZE,
.sp = (u64_t) (z_interrupt_stacks[0] + CONFIG_ISR_STACK_SIZE +
ARCH_THREAD_STACK_RESERVED),
.fn = z_x86_prep_c,
#ifdef CONFIG_X86_MMU
.ptables = &z_x86_flat_ptables,