b2938f8808
Use the cpu_number in the PDA to implement raw_smp_processor_id. This is a little simpler than using thread_info, though the cpu field in thread_info cannot be removed since it is used for things other than getting the current CPU in common code. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Chuck Ebbert <76306.1226@compuserve.com> Cc: Zachary Amsden <zach@vmware.com> Cc: Jan Beulich <jbeulich@novell.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org>
996 lines
23 KiB
ArmAsm
996 lines
23 KiB
ArmAsm
/*
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* linux/arch/i386/entry.S
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* entry.S contains the system-call and fault low-level handling routines.
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* This also contains the timer-interrupt handler, as well as all interrupts
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* and faults that can result in a task-switch.
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*
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* NOTE: This code handles signal-recognition, which happens every time
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* after a timer-interrupt and after each system call.
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*
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* I changed all the .align's to 4 (16 byte alignment), as that's faster
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* on a 486.
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*
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* Stack layout in 'ret_from_system_call':
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* ptrace needs to have all regs on the stack.
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* if the order here is changed, it needs to be
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* updated in fork.c:copy_process, signal.c:do_signal,
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* ptrace.c and ptrace.h
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*
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* 0(%esp) - %ebx
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* 4(%esp) - %ecx
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* 8(%esp) - %edx
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* C(%esp) - %esi
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* 10(%esp) - %edi
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* 14(%esp) - %ebp
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* 18(%esp) - %eax
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* 1C(%esp) - %ds
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* 20(%esp) - %es
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* 24(%esp) - %gs
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* 28(%esp) - orig_eax
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* 2C(%esp) - %eip
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* 30(%esp) - %cs
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* 34(%esp) - %eflags
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* 38(%esp) - %oldesp
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* 3C(%esp) - %oldss
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*
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* "current" is in register %ebx during any slow entries.
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*/
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#include <linux/linkage.h>
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#include <asm/thread_info.h>
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#include <asm/irqflags.h>
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#include <asm/errno.h>
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#include <asm/segment.h>
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#include <asm/smp.h>
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#include <asm/page.h>
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#include <asm/desc.h>
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#include <asm/percpu.h>
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#include <asm/dwarf2.h>
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#include "irq_vectors.h"
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#define nr_syscalls ((syscall_table_size)/4)
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CF_MASK = 0x00000001
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TF_MASK = 0x00000100
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IF_MASK = 0x00000200
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DF_MASK = 0x00000400
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NT_MASK = 0x00004000
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VM_MASK = 0x00020000
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/* These are replaces for paravirtualization */
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#define DISABLE_INTERRUPTS cli
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#define ENABLE_INTERRUPTS sti
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#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit
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#define INTERRUPT_RETURN iret
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#define GET_CR0_INTO_EAX movl %cr0, %eax
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#ifdef CONFIG_PREEMPT
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#define preempt_stop DISABLE_INTERRUPTS; TRACE_IRQS_OFF
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#else
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#define preempt_stop
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#define resume_kernel restore_nocheck
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#endif
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.macro TRACE_IRQS_IRET
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#ifdef CONFIG_TRACE_IRQFLAGS
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testl $IF_MASK,PT_EFLAGS(%esp) # interrupts off?
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jz 1f
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TRACE_IRQS_ON
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1:
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#endif
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.endm
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#ifdef CONFIG_VM86
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#define resume_userspace_sig check_userspace
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#else
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#define resume_userspace_sig resume_userspace
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#endif
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#define SAVE_ALL \
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cld; \
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pushl %gs; \
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CFI_ADJUST_CFA_OFFSET 4;\
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/*CFI_REL_OFFSET gs, 0;*/\
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pushl %es; \
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CFI_ADJUST_CFA_OFFSET 4;\
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/*CFI_REL_OFFSET es, 0;*/\
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pushl %ds; \
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CFI_ADJUST_CFA_OFFSET 4;\
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/*CFI_REL_OFFSET ds, 0;*/\
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pushl %eax; \
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CFI_ADJUST_CFA_OFFSET 4;\
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CFI_REL_OFFSET eax, 0;\
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pushl %ebp; \
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CFI_ADJUST_CFA_OFFSET 4;\
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CFI_REL_OFFSET ebp, 0;\
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pushl %edi; \
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CFI_ADJUST_CFA_OFFSET 4;\
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CFI_REL_OFFSET edi, 0;\
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pushl %esi; \
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CFI_ADJUST_CFA_OFFSET 4;\
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CFI_REL_OFFSET esi, 0;\
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pushl %edx; \
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CFI_ADJUST_CFA_OFFSET 4;\
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CFI_REL_OFFSET edx, 0;\
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pushl %ecx; \
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CFI_ADJUST_CFA_OFFSET 4;\
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CFI_REL_OFFSET ecx, 0;\
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pushl %ebx; \
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CFI_ADJUST_CFA_OFFSET 4;\
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CFI_REL_OFFSET ebx, 0;\
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movl $(__USER_DS), %edx; \
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movl %edx, %ds; \
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movl %edx, %es; \
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movl $(__KERNEL_PDA), %edx; \
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movl %edx, %gs
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#define RESTORE_INT_REGS \
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popl %ebx; \
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CFI_ADJUST_CFA_OFFSET -4;\
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CFI_RESTORE ebx;\
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popl %ecx; \
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CFI_ADJUST_CFA_OFFSET -4;\
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CFI_RESTORE ecx;\
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popl %edx; \
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CFI_ADJUST_CFA_OFFSET -4;\
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CFI_RESTORE edx;\
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popl %esi; \
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CFI_ADJUST_CFA_OFFSET -4;\
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CFI_RESTORE esi;\
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popl %edi; \
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CFI_ADJUST_CFA_OFFSET -4;\
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CFI_RESTORE edi;\
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popl %ebp; \
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CFI_ADJUST_CFA_OFFSET -4;\
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CFI_RESTORE ebp;\
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popl %eax; \
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CFI_ADJUST_CFA_OFFSET -4;\
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CFI_RESTORE eax
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#define RESTORE_REGS \
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RESTORE_INT_REGS; \
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1: popl %ds; \
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CFI_ADJUST_CFA_OFFSET -4;\
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/*CFI_RESTORE ds;*/\
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2: popl %es; \
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CFI_ADJUST_CFA_OFFSET -4;\
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/*CFI_RESTORE es;*/\
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3: popl %gs; \
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CFI_ADJUST_CFA_OFFSET -4;\
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/*CFI_RESTORE gs;*/\
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.pushsection .fixup,"ax"; \
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4: movl $0,(%esp); \
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jmp 1b; \
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5: movl $0,(%esp); \
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jmp 2b; \
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6: movl $0,(%esp); \
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jmp 3b; \
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.section __ex_table,"a";\
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.align 4; \
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.long 1b,4b; \
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.long 2b,5b; \
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.long 3b,6b; \
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.popsection
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#define RING0_INT_FRAME \
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CFI_STARTPROC simple;\
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CFI_SIGNAL_FRAME;\
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CFI_DEF_CFA esp, 3*4;\
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/*CFI_OFFSET cs, -2*4;*/\
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CFI_OFFSET eip, -3*4
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#define RING0_EC_FRAME \
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CFI_STARTPROC simple;\
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CFI_SIGNAL_FRAME;\
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CFI_DEF_CFA esp, 4*4;\
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/*CFI_OFFSET cs, -2*4;*/\
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CFI_OFFSET eip, -3*4
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#define RING0_PTREGS_FRAME \
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CFI_STARTPROC simple;\
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CFI_SIGNAL_FRAME;\
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CFI_DEF_CFA esp, PT_OLDESP-PT_EBX;\
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/*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/\
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CFI_OFFSET eip, PT_EIP-PT_OLDESP;\
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/*CFI_OFFSET es, PT_ES-PT_OLDESP;*/\
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/*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/\
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CFI_OFFSET eax, PT_EAX-PT_OLDESP;\
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CFI_OFFSET ebp, PT_EBP-PT_OLDESP;\
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CFI_OFFSET edi, PT_EDI-PT_OLDESP;\
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CFI_OFFSET esi, PT_ESI-PT_OLDESP;\
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CFI_OFFSET edx, PT_EDX-PT_OLDESP;\
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CFI_OFFSET ecx, PT_ECX-PT_OLDESP;\
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CFI_OFFSET ebx, PT_EBX-PT_OLDESP
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ENTRY(ret_from_fork)
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CFI_STARTPROC
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pushl %eax
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CFI_ADJUST_CFA_OFFSET 4
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call schedule_tail
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GET_THREAD_INFO(%ebp)
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popl %eax
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CFI_ADJUST_CFA_OFFSET -4
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pushl $0x0202 # Reset kernel eflags
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CFI_ADJUST_CFA_OFFSET 4
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popfl
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CFI_ADJUST_CFA_OFFSET -4
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jmp syscall_exit
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CFI_ENDPROC
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/*
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* Return to user mode is not as complex as all this looks,
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* but we want the default path for a system call return to
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* go as quickly as possible which is why some of this is
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* less clear than it otherwise should be.
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*/
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# userspace resumption stub bypassing syscall exit tracing
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ALIGN
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RING0_PTREGS_FRAME
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ret_from_exception:
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preempt_stop
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ret_from_intr:
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GET_THREAD_INFO(%ebp)
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check_userspace:
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movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS
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movb PT_CS(%esp), %al
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andl $(VM_MASK | SEGMENT_RPL_MASK), %eax
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cmpl $USER_RPL, %eax
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jb resume_kernel # not returning to v8086 or userspace
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ENTRY(resume_userspace)
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DISABLE_INTERRUPTS # make sure we don't miss an interrupt
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# setting need_resched or sigpending
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# between sampling and the iret
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movl TI_flags(%ebp), %ecx
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andl $_TIF_WORK_MASK, %ecx # is there any work to be done on
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# int/exception return?
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jne work_pending
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jmp restore_all
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#ifdef CONFIG_PREEMPT
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ENTRY(resume_kernel)
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DISABLE_INTERRUPTS
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cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ?
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jnz restore_nocheck
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need_resched:
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movl TI_flags(%ebp), %ecx # need_resched set ?
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testb $_TIF_NEED_RESCHED, %cl
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jz restore_all
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testl $IF_MASK,PT_EFLAGS(%esp) # interrupts off (exception path) ?
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jz restore_all
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call preempt_schedule_irq
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jmp need_resched
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#endif
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CFI_ENDPROC
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/* SYSENTER_RETURN points to after the "sysenter" instruction in
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the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */
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# sysenter call handler stub
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ENTRY(sysenter_entry)
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CFI_STARTPROC simple
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CFI_SIGNAL_FRAME
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CFI_DEF_CFA esp, 0
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CFI_REGISTER esp, ebp
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movl TSS_sysenter_esp0(%esp),%esp
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sysenter_past_esp:
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/*
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* No need to follow this irqs on/off section: the syscall
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* disabled irqs and here we enable it straight after entry:
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*/
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ENABLE_INTERRUPTS
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pushl $(__USER_DS)
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CFI_ADJUST_CFA_OFFSET 4
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/*CFI_REL_OFFSET ss, 0*/
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pushl %ebp
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CFI_ADJUST_CFA_OFFSET 4
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CFI_REL_OFFSET esp, 0
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pushfl
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CFI_ADJUST_CFA_OFFSET 4
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pushl $(__USER_CS)
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CFI_ADJUST_CFA_OFFSET 4
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/*CFI_REL_OFFSET cs, 0*/
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/*
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* Push current_thread_info()->sysenter_return to the stack.
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* A tiny bit of offset fixup is necessary - 4*4 means the 4 words
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* pushed above; +8 corresponds to copy_thread's esp0 setting.
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*/
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pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp)
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CFI_ADJUST_CFA_OFFSET 4
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CFI_REL_OFFSET eip, 0
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/*
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* Load the potential sixth argument from user stack.
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* Careful about security.
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*/
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cmpl $__PAGE_OFFSET-3,%ebp
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jae syscall_fault
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1: movl (%ebp),%ebp
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.section __ex_table,"a"
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.align 4
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.long 1b,syscall_fault
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.previous
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pushl %eax
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
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testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
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jnz syscall_trace_entry
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cmpl $(nr_syscalls), %eax
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jae syscall_badsys
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call *sys_call_table(,%eax,4)
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movl %eax,PT_EAX(%esp)
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DISABLE_INTERRUPTS
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TRACE_IRQS_OFF
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movl TI_flags(%ebp), %ecx
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testw $_TIF_ALLWORK_MASK, %cx
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jne syscall_exit_work
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/* if something modifies registers it must also disable sysexit */
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movl PT_EIP(%esp), %edx
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movl PT_OLDESP(%esp), %ecx
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xorl %ebp,%ebp
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TRACE_IRQS_ON
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1: mov PT_GS(%esp), %gs
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ENABLE_INTERRUPTS_SYSEXIT
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CFI_ENDPROC
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.pushsection .fixup,"ax"
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2: movl $0,PT_GS(%esp)
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jmp 1b
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.section __ex_table,"a"
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.align 4
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.long 1b,2b
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.popsection
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# system call handler stub
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ENTRY(system_call)
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RING0_INT_FRAME # can't unwind into user space anyway
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pushl %eax # save orig_eax
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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testl $TF_MASK,PT_EFLAGS(%esp)
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jz no_singlestep
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orl $_TIF_SINGLESTEP,TI_flags(%ebp)
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no_singlestep:
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# system call tracing in operation / emulation
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/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
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testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
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jnz syscall_trace_entry
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cmpl $(nr_syscalls), %eax
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jae syscall_badsys
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syscall_call:
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call *sys_call_table(,%eax,4)
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movl %eax,PT_EAX(%esp) # store the return value
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syscall_exit:
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DISABLE_INTERRUPTS # make sure we don't miss an interrupt
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# setting need_resched or sigpending
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# between sampling and the iret
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TRACE_IRQS_OFF
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movl TI_flags(%ebp), %ecx
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testw $_TIF_ALLWORK_MASK, %cx # current->work
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jne syscall_exit_work
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restore_all:
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movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS
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# Warning: PT_OLDSS(%esp) contains the wrong/random values if we
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# are returning to the kernel.
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# See comments in process.c:copy_thread() for details.
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movb PT_OLDSS(%esp), %ah
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movb PT_CS(%esp), %al
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andl $(VM_MASK | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax
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cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
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CFI_REMEMBER_STATE
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je ldt_ss # returning to user-space with LDT SS
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restore_nocheck:
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TRACE_IRQS_IRET
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restore_nocheck_notrace:
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RESTORE_REGS
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addl $4, %esp # skip orig_eax/error_code
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CFI_ADJUST_CFA_OFFSET -4
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1: INTERRUPT_RETURN
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.section .fixup,"ax"
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iret_exc:
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS
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pushl $0 # no error code
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pushl $do_iret_error
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jmp error_code
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.previous
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.section __ex_table,"a"
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.align 4
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.long 1b,iret_exc
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.previous
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CFI_RESTORE_STATE
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ldt_ss:
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larl PT_OLDSS(%esp), %eax
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jnz restore_nocheck
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testl $0x00400000, %eax # returning to 32bit stack?
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jnz restore_nocheck # allright, normal return
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/* If returning to userspace with 16bit stack,
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* try to fix the higher word of ESP, as the CPU
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* won't restore it.
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* This is an "official" bug of all the x86-compatible
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* CPUs, which we can try to work around to make
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* dosemu and wine happy. */
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movl PT_OLDESP(%esp), %eax
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movl %esp, %edx
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call patch_espfix_desc
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pushl $__ESPFIX_SS
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CFI_ADJUST_CFA_OFFSET 4
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pushl %eax
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CFI_ADJUST_CFA_OFFSET 4
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DISABLE_INTERRUPTS
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TRACE_IRQS_OFF
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lss (%esp), %esp
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CFI_ADJUST_CFA_OFFSET -8
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jmp restore_nocheck
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CFI_ENDPROC
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# perform work that needs to be done immediately before resumption
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ALIGN
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RING0_PTREGS_FRAME # can't unwind into user space anyway
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work_pending:
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testb $_TIF_NEED_RESCHED, %cl
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jz work_notifysig
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work_resched:
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call schedule
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DISABLE_INTERRUPTS # make sure we don't miss an interrupt
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# setting need_resched or sigpending
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# between sampling and the iret
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TRACE_IRQS_OFF
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movl TI_flags(%ebp), %ecx
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andl $_TIF_WORK_MASK, %ecx # is there any work to be done other
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# than syscall tracing?
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jz restore_all
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testb $_TIF_NEED_RESCHED, %cl
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jnz work_resched
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work_notifysig: # deal with pending signals and
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# notify-resume requests
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testl $VM_MASK, PT_EFLAGS(%esp)
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movl %esp, %eax
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jne work_notifysig_v86 # returning to kernel-space or
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# vm86-space
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xorl %edx, %edx
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call do_notify_resume
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jmp resume_userspace_sig
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ALIGN
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work_notifysig_v86:
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#ifdef CONFIG_VM86
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pushl %ecx # save ti_flags for do_notify_resume
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CFI_ADJUST_CFA_OFFSET 4
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|
call save_v86_state # %eax contains pt_regs pointer
|
|
popl %ecx
|
|
CFI_ADJUST_CFA_OFFSET -4
|
|
movl %eax, %esp
|
|
xorl %edx, %edx
|
|
call do_notify_resume
|
|
jmp resume_userspace_sig
|
|
#endif
|
|
|
|
# perform syscall exit tracing
|
|
ALIGN
|
|
syscall_trace_entry:
|
|
movl $-ENOSYS,PT_EAX(%esp)
|
|
movl %esp, %eax
|
|
xorl %edx,%edx
|
|
call do_syscall_trace
|
|
cmpl $0, %eax
|
|
jne resume_userspace # ret != 0 -> running under PTRACE_SYSEMU,
|
|
# so must skip actual syscall
|
|
movl PT_ORIG_EAX(%esp), %eax
|
|
cmpl $(nr_syscalls), %eax
|
|
jnae syscall_call
|
|
jmp syscall_exit
|
|
|
|
# perform syscall exit tracing
|
|
ALIGN
|
|
syscall_exit_work:
|
|
testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl
|
|
jz work_pending
|
|
TRACE_IRQS_ON
|
|
ENABLE_INTERRUPTS # could let do_syscall_trace() call
|
|
# schedule() instead
|
|
movl %esp, %eax
|
|
movl $1, %edx
|
|
call do_syscall_trace
|
|
jmp resume_userspace
|
|
CFI_ENDPROC
|
|
|
|
RING0_INT_FRAME # can't unwind into user space anyway
|
|
syscall_fault:
|
|
pushl %eax # save orig_eax
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
SAVE_ALL
|
|
GET_THREAD_INFO(%ebp)
|
|
movl $-EFAULT,PT_EAX(%esp)
|
|
jmp resume_userspace
|
|
|
|
syscall_badsys:
|
|
movl $-ENOSYS,PT_EAX(%esp)
|
|
jmp resume_userspace
|
|
CFI_ENDPROC
|
|
|
|
#define FIXUP_ESPFIX_STACK \
|
|
/* since we are on a wrong stack, we cant make it a C code :( */ \
|
|
movl %gs:PDA_cpu, %ebx; \
|
|
PER_CPU(cpu_gdt_descr, %ebx); \
|
|
movl GDS_address(%ebx), %ebx; \
|
|
GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah); \
|
|
addl %esp, %eax; \
|
|
pushl $__KERNEL_DS; \
|
|
CFI_ADJUST_CFA_OFFSET 4; \
|
|
pushl %eax; \
|
|
CFI_ADJUST_CFA_OFFSET 4; \
|
|
lss (%esp), %esp; \
|
|
CFI_ADJUST_CFA_OFFSET -8;
|
|
#define UNWIND_ESPFIX_STACK \
|
|
movl %ss, %eax; \
|
|
/* see if on espfix stack */ \
|
|
cmpw $__ESPFIX_SS, %ax; \
|
|
jne 27f; \
|
|
movl $__KERNEL_DS, %eax; \
|
|
movl %eax, %ds; \
|
|
movl %eax, %es; \
|
|
/* switch to normal stack */ \
|
|
FIXUP_ESPFIX_STACK; \
|
|
27:;
|
|
|
|
/*
|
|
* Build the entry stubs and pointer table with
|
|
* some assembler magic.
|
|
*/
|
|
.data
|
|
ENTRY(interrupt)
|
|
.text
|
|
|
|
vector=0
|
|
ENTRY(irq_entries_start)
|
|
RING0_INT_FRAME
|
|
.rept NR_IRQS
|
|
ALIGN
|
|
.if vector
|
|
CFI_ADJUST_CFA_OFFSET -4
|
|
.endif
|
|
1: pushl $~(vector)
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp common_interrupt
|
|
.data
|
|
.long 1b
|
|
.text
|
|
vector=vector+1
|
|
.endr
|
|
|
|
/*
|
|
* the CPU automatically disables interrupts when executing an IRQ vector,
|
|
* so IRQ-flags tracing has to follow that:
|
|
*/
|
|
ALIGN
|
|
common_interrupt:
|
|
SAVE_ALL
|
|
TRACE_IRQS_OFF
|
|
movl %esp,%eax
|
|
call do_IRQ
|
|
jmp ret_from_intr
|
|
CFI_ENDPROC
|
|
|
|
#define BUILD_INTERRUPT(name, nr) \
|
|
ENTRY(name) \
|
|
RING0_INT_FRAME; \
|
|
pushl $~(nr); \
|
|
CFI_ADJUST_CFA_OFFSET 4; \
|
|
SAVE_ALL; \
|
|
TRACE_IRQS_OFF \
|
|
movl %esp,%eax; \
|
|
call smp_/**/name; \
|
|
jmp ret_from_intr; \
|
|
CFI_ENDPROC
|
|
|
|
/* The include is where all of the SMP etc. interrupts come from */
|
|
#include "entry_arch.h"
|
|
|
|
KPROBE_ENTRY(page_fault)
|
|
RING0_EC_FRAME
|
|
pushl $do_page_fault
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
ALIGN
|
|
error_code:
|
|
/* the function address is in %gs's slot on the stack */
|
|
pushl %es
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
/*CFI_REL_OFFSET es, 0*/
|
|
pushl %ds
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
/*CFI_REL_OFFSET ds, 0*/
|
|
pushl %eax
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
CFI_REL_OFFSET eax, 0
|
|
pushl %ebp
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
CFI_REL_OFFSET ebp, 0
|
|
pushl %edi
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
CFI_REL_OFFSET edi, 0
|
|
pushl %esi
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
CFI_REL_OFFSET esi, 0
|
|
pushl %edx
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
CFI_REL_OFFSET edx, 0
|
|
pushl %ecx
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
CFI_REL_OFFSET ecx, 0
|
|
pushl %ebx
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
CFI_REL_OFFSET ebx, 0
|
|
cld
|
|
pushl %gs
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
/*CFI_REL_OFFSET gs, 0*/
|
|
movl $(__KERNEL_PDA), %ecx
|
|
movl %ecx, %gs
|
|
UNWIND_ESPFIX_STACK
|
|
popl %ecx
|
|
CFI_ADJUST_CFA_OFFSET -4
|
|
/*CFI_REGISTER es, ecx*/
|
|
movl PT_GS(%esp), %edi # get the function address
|
|
movl PT_ORIG_EAX(%esp), %edx # get the error code
|
|
movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart
|
|
mov %ecx, PT_GS(%esp)
|
|
/*CFI_REL_OFFSET gs, ES*/
|
|
movl $(__USER_DS), %ecx
|
|
movl %ecx, %ds
|
|
movl %ecx, %es
|
|
movl %esp,%eax # pt_regs pointer
|
|
call *%edi
|
|
jmp ret_from_exception
|
|
CFI_ENDPROC
|
|
KPROBE_END(page_fault)
|
|
|
|
ENTRY(coprocessor_error)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_coprocessor_error
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(simd_coprocessor_error)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_simd_coprocessor_error
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(device_not_available)
|
|
RING0_INT_FRAME
|
|
pushl $-1 # mark this as an int
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
SAVE_ALL
|
|
GET_CR0_INTO_EAX
|
|
testl $0x4, %eax # EM (math emulation bit)
|
|
jne device_not_available_emulate
|
|
preempt_stop
|
|
call math_state_restore
|
|
jmp ret_from_exception
|
|
device_not_available_emulate:
|
|
pushl $0 # temporary storage for ORIG_EIP
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
call math_emulate
|
|
addl $4, %esp
|
|
CFI_ADJUST_CFA_OFFSET -4
|
|
jmp ret_from_exception
|
|
CFI_ENDPROC
|
|
|
|
/*
|
|
* Debug traps and NMI can happen at the one SYSENTER instruction
|
|
* that sets up the real kernel stack. Check here, since we can't
|
|
* allow the wrong stack to be used.
|
|
*
|
|
* "TSS_sysenter_esp0+12" is because the NMI/debug handler will have
|
|
* already pushed 3 words if it hits on the sysenter instruction:
|
|
* eflags, cs and eip.
|
|
*
|
|
* We just load the right stack, and push the three (known) values
|
|
* by hand onto the new stack - while updating the return eip past
|
|
* the instruction that would have done it for sysenter.
|
|
*/
|
|
#define FIX_STACK(offset, ok, label) \
|
|
cmpw $__KERNEL_CS,4(%esp); \
|
|
jne ok; \
|
|
label: \
|
|
movl TSS_sysenter_esp0+offset(%esp),%esp; \
|
|
CFI_DEF_CFA esp, 0; \
|
|
CFI_UNDEFINED eip; \
|
|
pushfl; \
|
|
CFI_ADJUST_CFA_OFFSET 4; \
|
|
pushl $__KERNEL_CS; \
|
|
CFI_ADJUST_CFA_OFFSET 4; \
|
|
pushl $sysenter_past_esp; \
|
|
CFI_ADJUST_CFA_OFFSET 4; \
|
|
CFI_REL_OFFSET eip, 0
|
|
|
|
KPROBE_ENTRY(debug)
|
|
RING0_INT_FRAME
|
|
cmpl $sysenter_entry,(%esp)
|
|
jne debug_stack_correct
|
|
FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
|
|
debug_stack_correct:
|
|
pushl $-1 # mark this as an int
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
SAVE_ALL
|
|
xorl %edx,%edx # error code 0
|
|
movl %esp,%eax # pt_regs pointer
|
|
call do_debug
|
|
jmp ret_from_exception
|
|
CFI_ENDPROC
|
|
KPROBE_END(debug)
|
|
|
|
/*
|
|
* NMI is doubly nasty. It can happen _while_ we're handling
|
|
* a debug fault, and the debug fault hasn't yet been able to
|
|
* clear up the stack. So we first check whether we got an
|
|
* NMI on the sysenter entry path, but after that we need to
|
|
* check whether we got an NMI on the debug path where the debug
|
|
* fault happened on the sysenter path.
|
|
*/
|
|
KPROBE_ENTRY(nmi)
|
|
RING0_INT_FRAME
|
|
pushl %eax
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
movl %ss, %eax
|
|
cmpw $__ESPFIX_SS, %ax
|
|
popl %eax
|
|
CFI_ADJUST_CFA_OFFSET -4
|
|
je nmi_espfix_stack
|
|
cmpl $sysenter_entry,(%esp)
|
|
je nmi_stack_fixup
|
|
pushl %eax
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
movl %esp,%eax
|
|
/* Do not access memory above the end of our stack page,
|
|
* it might not exist.
|
|
*/
|
|
andl $(THREAD_SIZE-1),%eax
|
|
cmpl $(THREAD_SIZE-20),%eax
|
|
popl %eax
|
|
CFI_ADJUST_CFA_OFFSET -4
|
|
jae nmi_stack_correct
|
|
cmpl $sysenter_entry,12(%esp)
|
|
je nmi_debug_stack_check
|
|
nmi_stack_correct:
|
|
/* We have a RING0_INT_FRAME here */
|
|
pushl %eax
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
SAVE_ALL
|
|
xorl %edx,%edx # zero error code
|
|
movl %esp,%eax # pt_regs pointer
|
|
call do_nmi
|
|
jmp restore_nocheck_notrace
|
|
CFI_ENDPROC
|
|
|
|
nmi_stack_fixup:
|
|
RING0_INT_FRAME
|
|
FIX_STACK(12,nmi_stack_correct, 1)
|
|
jmp nmi_stack_correct
|
|
|
|
nmi_debug_stack_check:
|
|
/* We have a RING0_INT_FRAME here */
|
|
cmpw $__KERNEL_CS,16(%esp)
|
|
jne nmi_stack_correct
|
|
cmpl $debug,(%esp)
|
|
jb nmi_stack_correct
|
|
cmpl $debug_esp_fix_insn,(%esp)
|
|
ja nmi_stack_correct
|
|
FIX_STACK(24,nmi_stack_correct, 1)
|
|
jmp nmi_stack_correct
|
|
|
|
nmi_espfix_stack:
|
|
/* We have a RING0_INT_FRAME here.
|
|
*
|
|
* create the pointer to lss back
|
|
*/
|
|
pushl %ss
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl %esp
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
addw $4, (%esp)
|
|
/* copy the iret frame of 12 bytes */
|
|
.rept 3
|
|
pushl 16(%esp)
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
.endr
|
|
pushl %eax
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
SAVE_ALL
|
|
FIXUP_ESPFIX_STACK # %eax == %esp
|
|
xorl %edx,%edx # zero error code
|
|
call do_nmi
|
|
RESTORE_REGS
|
|
lss 12+4(%esp), %esp # back to espfix stack
|
|
CFI_ADJUST_CFA_OFFSET -24
|
|
1: INTERRUPT_RETURN
|
|
CFI_ENDPROC
|
|
.section __ex_table,"a"
|
|
.align 4
|
|
.long 1b,iret_exc
|
|
.previous
|
|
KPROBE_END(nmi)
|
|
|
|
KPROBE_ENTRY(int3)
|
|
RING0_INT_FRAME
|
|
pushl $-1 # mark this as an int
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
SAVE_ALL
|
|
xorl %edx,%edx # zero error code
|
|
movl %esp,%eax # pt_regs pointer
|
|
call do_int3
|
|
jmp ret_from_exception
|
|
CFI_ENDPROC
|
|
KPROBE_END(int3)
|
|
|
|
ENTRY(overflow)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_overflow
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(bounds)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_bounds
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(invalid_op)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_invalid_op
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(coprocessor_segment_overrun)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_coprocessor_segment_overrun
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(invalid_TSS)
|
|
RING0_EC_FRAME
|
|
pushl $do_invalid_TSS
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(segment_not_present)
|
|
RING0_EC_FRAME
|
|
pushl $do_segment_not_present
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(stack_segment)
|
|
RING0_EC_FRAME
|
|
pushl $do_stack_segment
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
KPROBE_ENTRY(general_protection)
|
|
RING0_EC_FRAME
|
|
pushl $do_general_protection
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
KPROBE_END(general_protection)
|
|
|
|
ENTRY(alignment_check)
|
|
RING0_EC_FRAME
|
|
pushl $do_alignment_check
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
ENTRY(divide_error)
|
|
RING0_INT_FRAME
|
|
pushl $0 # no error code
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_divide_error
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
#ifdef CONFIG_X86_MCE
|
|
ENTRY(machine_check)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl machine_check_vector
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
#endif
|
|
|
|
ENTRY(spurious_interrupt_bug)
|
|
RING0_INT_FRAME
|
|
pushl $0
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
pushl $do_spurious_interrupt_bug
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
jmp error_code
|
|
CFI_ENDPROC
|
|
|
|
#ifdef CONFIG_STACK_UNWIND
|
|
ENTRY(arch_unwind_init_running)
|
|
CFI_STARTPROC
|
|
movl 4(%esp), %edx
|
|
movl (%esp), %ecx
|
|
leal 4(%esp), %eax
|
|
movl %ebx, PT_EBX(%edx)
|
|
xorl %ebx, %ebx
|
|
movl %ebx, PT_ECX(%edx)
|
|
movl %ebx, PT_EDX(%edx)
|
|
movl %esi, PT_ESI(%edx)
|
|
movl %edi, PT_EDI(%edx)
|
|
movl %ebp, PT_EBP(%edx)
|
|
movl %ebx, PT_EAX(%edx)
|
|
movl $__USER_DS, PT_DS(%edx)
|
|
movl $__USER_DS, PT_ES(%edx)
|
|
movl $0, PT_GS(%edx)
|
|
movl %ebx, PT_ORIG_EAX(%edx)
|
|
movl %ecx, PT_EIP(%edx)
|
|
movl 12(%esp), %ecx
|
|
movl $__KERNEL_CS, PT_CS(%edx)
|
|
movl %ebx, PT_EFLAGS(%edx)
|
|
movl %eax, PT_OLDESP(%edx)
|
|
movl 8(%esp), %eax
|
|
movl %ecx, 8(%esp)
|
|
movl PT_EBX(%edx), %ebx
|
|
movl $__KERNEL_DS, PT_OLDSS(%edx)
|
|
jmpl *%eax
|
|
CFI_ENDPROC
|
|
ENDPROC(arch_unwind_init_running)
|
|
#endif
|
|
|
|
ENTRY(kernel_thread_helper)
|
|
pushl $0 # fake return address for unwinder
|
|
CFI_STARTPROC
|
|
movl %edx,%eax
|
|
push %edx
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
call *%ebx
|
|
push %eax
|
|
CFI_ADJUST_CFA_OFFSET 4
|
|
call do_exit
|
|
CFI_ENDPROC
|
|
ENDPROC(kernel_thread_helper)
|
|
|
|
.section .rodata,"a"
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#include "syscall_table.S"
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syscall_table_size=(.-sys_call_table)
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