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x86: install guard page for interrupt stack

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We need to know when the interrupt stack overflows as well as
thread stacks.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-07-25 13:51:34 -07:00 • committed by Anas Nashif
commit d944950aaa
2 changed files with 14 additions and 1 deletions
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11
arch/x86/core/crt0.S
View file

@ -175,14 +175,23 @@ __csSet:
#ifdef CONFIG_INIT_STACKS
movl $0xAAAAAAAA, %eax
leal _interrupt_stack, %edi
#ifdef CONFIG_X86_STACK_PROTECTION
addl $4096, %edi
#endif
stack_size_dwords = (CONFIG_ISR_STACK_SIZE / 4)
movl $stack_size_dwords, %ecx
rep stosl
#endif
movl $_interrupt_stack, %esp
#ifdef CONFIG_X86_STACK_PROTECTION
/* In this configuration, all stacks, including IRQ stack, are declared
* with a 4K non-present guard page preceding the stack buffer
*/
addl $(CONFIG_ISR_STACK_SIZE + 4096), %esp
#else
addl $CONFIG_ISR_STACK_SIZE, %esp
#endif
#if defined(CONFIG_SYS_POWER_DEEP_SLEEP) && \
!defined(CONFIG_BOOTLOADER_CONTEXT_RESTORE)
/*

4
arch/x86/include/kernel_arch_func.h
View file

@ -37,6 +37,10 @@ static inline void kernel_arch_init(void)
_kernel.nested = 0;
_kernel.irq_stack = K_THREAD_STACK_BUFFER(_interrupt_stack) +
CONFIG_ISR_STACK_SIZE;
#if CONFIG_X86_STACK_PROTECTION
_x86_mmu_set_flags(_interrupt_stack, MMU_PAGE_SIZE,
MMU_ENTRY_NOT_PRESENT, MMU_PTE_P_MASK);
#endif
}
/**