a4045dff78
In x86_64 platform, INT1 and INT3 trap stack is IST stack called DEBUG_STACK, when INT1/INT3 trap happens, system will switch to DEBUG_STACK by hardware. Current DEBUG_STACK size is 4K, when int1/int3 trap happens, kernel will minus current DEBUG_STACK IST value by 4k. But if int3/int1 trap is nested, it will destroy other vector's IST stack. This patch modifies this, it sets DEBUG_STACK size as 8K and allows two level of nested int1/int3 trap. Kprobe DEBUG_STACK may be nested, because kprobe handler may be probed by other kprobes. Thanks jbeulich for pointing out error in the first patch. [AK: nested kprobes are pretty dubious. Hopefully one nest will be enough. This will cost 8K per CPU (4K more than before)] Signed-off-by: bibo, mao <bibo.mao@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
#ifndef _X86_64_PAGE_H
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#define _X86_64_PAGE_H
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 12
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#ifdef __ASSEMBLY__
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#define PAGE_SIZE (0x1 << PAGE_SHIFT)
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#else
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#endif
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define PHYSICAL_PAGE_MASK (~(PAGE_SIZE-1) & __PHYSICAL_MASK)
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#define THREAD_ORDER 1
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#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
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#define CURRENT_MASK (~(THREAD_SIZE-1))
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#define EXCEPTION_STACK_ORDER 0
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#define EXCEPTION_STKSZ (PAGE_SIZE << EXCEPTION_STACK_ORDER)
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#define DEBUG_STACK_ORDER (EXCEPTION_STACK_ORDER + 1)
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#define DEBUG_STKSZ (PAGE_SIZE << DEBUG_STACK_ORDER)
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#define IRQSTACK_ORDER 2
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#define IRQSTACKSIZE (PAGE_SIZE << IRQSTACK_ORDER)
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#define STACKFAULT_STACK 1
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#define DOUBLEFAULT_STACK 2
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#define NMI_STACK 3
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#define DEBUG_STACK 4
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#define MCE_STACK 5
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#define N_EXCEPTION_STACKS 5 /* hw limit: 7 */
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#define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
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#define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
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#define HPAGE_SHIFT PMD_SHIFT
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#define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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extern unsigned long end_pfn;
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void clear_page(void *);
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void copy_page(void *, void *);
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pud; } pud_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define PTE_MASK PHYSICAL_PAGE_MASK
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pte_val(x) ((x).pte)
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#define pmd_val(x) ((x).pmd)
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#define pud_val(x) ((x).pud)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pud(x) ((pud_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
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#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
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#define __START_KERNEL_map 0xffffffff80000000UL
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#define __PAGE_OFFSET 0xffff810000000000UL
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#else
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#define __PHYSICAL_START CONFIG_PHYSICAL_START
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#define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START)
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#define __START_KERNEL_map 0xffffffff80000000
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#define __PAGE_OFFSET 0xffff810000000000
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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/* See Documentation/x86_64/mm.txt for a description of the memory map. */
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#define __PHYSICAL_MASK_SHIFT 46
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#define __PHYSICAL_MASK ((1UL << __PHYSICAL_MASK_SHIFT) - 1)
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#define __VIRTUAL_MASK_SHIFT 48
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#define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
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#define KERNEL_TEXT_SIZE (40UL*1024*1024)
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#define KERNEL_TEXT_START 0xffffffff80000000UL
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#ifndef __ASSEMBLY__
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#include <asm/bug.h>
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#endif /* __ASSEMBLY__ */
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#define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
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/* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
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Otherwise you risk miscompilation. */
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#define __pa(x) (((unsigned long)(x)>=__START_KERNEL_map)?(unsigned long)(x) - (unsigned long)__START_KERNEL_map:(unsigned long)(x) - PAGE_OFFSET)
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/* __pa_symbol should be used for C visible symbols.
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This seems to be the official gcc blessed way to do such arithmetic. */
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#define __pa_symbol(x) \
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({unsigned long v; \
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asm("" : "=r" (v) : "0" (x)); \
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__pa(v); })
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#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
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#define __boot_va(x) __va(x)
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#define __boot_pa(x) __pa(x)
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn) ((pfn) < end_pfn)
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#endif
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#define VM_DATA_DEFAULT_FLAGS \
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(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
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VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#define __HAVE_ARCH_GATE_AREA 1
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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#endif /* __KERNEL__ */
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#endif /* _X86_64_PAGE_H */
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