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i386: get rid of the use of KPROBE_ENTRY / KPROBE_END
entry_32.S is now the only user of KPROBE_ENTRY / KPROBE_END, treewide. This patch reorders entry_64.S and explicitly generates a separate section for functions that need the protection. The generated code before and after the patch is equal. The KPROBE_ENTRY and KPROBE_END macro's are removed too. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alexander van Heukelum
Ingo Molnar
parent
ddeb8f2149
commit
d211af055d
2 changed files with 224 additions and 222 deletions
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@ -688,65 +688,6 @@ ENDPROC(name)
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/* The include is where all of the SMP etc. interrupts come from */
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#include "entry_arch.h"
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KPROBE_ENTRY(page_fault)
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RING0_EC_FRAME
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pushl $do_page_fault
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CFI_ADJUST_CFA_OFFSET 4
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ALIGN
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error_code:
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/* the function address is in %fs's slot on the stack */
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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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cld
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pushl %fs
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CFI_ADJUST_CFA_OFFSET 4
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/*CFI_REL_OFFSET fs, 0*/
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movl $(__KERNEL_PERCPU), %ecx
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movl %ecx, %fs
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UNWIND_ESPFIX_STACK
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popl %ecx
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CFI_ADJUST_CFA_OFFSET -4
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/*CFI_REGISTER es, ecx*/
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movl PT_FS(%esp), %edi # get the function address
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movl PT_ORIG_EAX(%esp), %edx # get the error code
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movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart
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mov %ecx, PT_FS(%esp)
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/*CFI_REL_OFFSET fs, ES*/
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movl $(__USER_DS), %ecx
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movl %ecx, %ds
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movl %ecx, %es
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TRACE_IRQS_OFF
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movl %esp,%eax # pt_regs pointer
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call *%edi
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jmp ret_from_exception
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CFI_ENDPROC
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KPROBE_END(page_fault)
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ENTRY(coprocessor_error)
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RING0_INT_FRAME
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pushl $0
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@ -777,140 +718,6 @@ ENTRY(device_not_available)
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CFI_ENDPROC
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END(device_not_available)
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/*
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* Debug traps and NMI can happen at the one SYSENTER instruction
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* that sets up the real kernel stack. Check here, since we can't
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* allow the wrong stack to be used.
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*
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* "TSS_sysenter_sp0+12" is because the NMI/debug handler will have
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* already pushed 3 words if it hits on the sysenter instruction:
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* eflags, cs and eip.
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*
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* We just load the right stack, and push the three (known) values
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* by hand onto the new stack - while updating the return eip past
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* the instruction that would have done it for sysenter.
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*/
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#define FIX_STACK(offset, ok, label) \
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cmpw $__KERNEL_CS,4(%esp); \
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jne ok; \
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label: \
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movl TSS_sysenter_sp0+offset(%esp),%esp; \
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CFI_DEF_CFA esp, 0; \
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CFI_UNDEFINED eip; \
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pushfl; \
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CFI_ADJUST_CFA_OFFSET 4; \
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pushl $__KERNEL_CS; \
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CFI_ADJUST_CFA_OFFSET 4; \
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pushl $sysenter_past_esp; \
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CFI_ADJUST_CFA_OFFSET 4; \
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CFI_REL_OFFSET eip, 0
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KPROBE_ENTRY(debug)
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RING0_INT_FRAME
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cmpl $ia32_sysenter_target,(%esp)
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jne debug_stack_correct
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FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
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debug_stack_correct:
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pushl $-1 # mark this as an int
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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TRACE_IRQS_OFF
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xorl %edx,%edx # error code 0
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movl %esp,%eax # pt_regs pointer
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call do_debug
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jmp ret_from_exception
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CFI_ENDPROC
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KPROBE_END(debug)
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/*
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* NMI is doubly nasty. It can happen _while_ we're handling
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* a debug fault, and the debug fault hasn't yet been able to
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* clear up the stack. So we first check whether we got an
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* NMI on the sysenter entry path, but after that we need to
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* check whether we got an NMI on the debug path where the debug
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* fault happened on the sysenter path.
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*/
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KPROBE_ENTRY(nmi)
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RING0_INT_FRAME
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pushl %eax
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CFI_ADJUST_CFA_OFFSET 4
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movl %ss, %eax
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cmpw $__ESPFIX_SS, %ax
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popl %eax
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CFI_ADJUST_CFA_OFFSET -4
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je nmi_espfix_stack
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cmpl $ia32_sysenter_target,(%esp)
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je nmi_stack_fixup
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pushl %eax
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CFI_ADJUST_CFA_OFFSET 4
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movl %esp,%eax
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/* Do not access memory above the end of our stack page,
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* it might not exist.
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*/
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andl $(THREAD_SIZE-1),%eax
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cmpl $(THREAD_SIZE-20),%eax
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popl %eax
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CFI_ADJUST_CFA_OFFSET -4
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jae nmi_stack_correct
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cmpl $ia32_sysenter_target,12(%esp)
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je nmi_debug_stack_check
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nmi_stack_correct:
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/* We have a RING0_INT_FRAME here */
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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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TRACE_IRQS_OFF
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xorl %edx,%edx # zero error code
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movl %esp,%eax # pt_regs pointer
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call do_nmi
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jmp restore_nocheck_notrace
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CFI_ENDPROC
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nmi_stack_fixup:
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RING0_INT_FRAME
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FIX_STACK(12,nmi_stack_correct, 1)
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jmp nmi_stack_correct
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nmi_debug_stack_check:
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/* We have a RING0_INT_FRAME here */
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cmpw $__KERNEL_CS,16(%esp)
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jne nmi_stack_correct
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cmpl $debug,(%esp)
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jb nmi_stack_correct
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cmpl $debug_esp_fix_insn,(%esp)
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ja nmi_stack_correct
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FIX_STACK(24,nmi_stack_correct, 1)
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jmp nmi_stack_correct
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nmi_espfix_stack:
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/* We have a RING0_INT_FRAME here.
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*
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* create the pointer to lss back
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*/
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pushl %ss
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CFI_ADJUST_CFA_OFFSET 4
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pushl %esp
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CFI_ADJUST_CFA_OFFSET 4
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addw $4, (%esp)
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/* copy the iret frame of 12 bytes */
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.rept 3
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pushl 16(%esp)
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CFI_ADJUST_CFA_OFFSET 4
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.endr
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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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TRACE_IRQS_OFF
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FIXUP_ESPFIX_STACK # %eax == %esp
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xorl %edx,%edx # zero error code
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call do_nmi
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RESTORE_REGS
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lss 12+4(%esp), %esp # back to espfix stack
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CFI_ADJUST_CFA_OFFSET -24
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jmp irq_return
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CFI_ENDPROC
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KPROBE_END(nmi)
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#ifdef CONFIG_PARAVIRT
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ENTRY(native_iret)
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iret
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@ -926,19 +733,6 @@ ENTRY(native_irq_enable_sysexit)
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END(native_irq_enable_sysexit)
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#endif
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KPROBE_ENTRY(int3)
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RING0_INT_FRAME
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pushl $-1 # mark this as an int
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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TRACE_IRQS_OFF
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xorl %edx,%edx # zero error code
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movl %esp,%eax # pt_regs pointer
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call do_int3
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jmp ret_from_exception
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CFI_ENDPROC
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KPROBE_END(int3)
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ENTRY(overflow)
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RING0_INT_FRAME
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pushl $0
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@ -1003,14 +797,6 @@ ENTRY(stack_segment)
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CFI_ENDPROC
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END(stack_segment)
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KPROBE_ENTRY(general_protection)
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RING0_EC_FRAME
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pushl $do_general_protection
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CFI_ADJUST_CFA_OFFSET 4
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jmp error_code
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CFI_ENDPROC
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KPROBE_END(general_protection)
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ENTRY(alignment_check)
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RING0_EC_FRAME
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pushl $do_alignment_check
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@ -1220,3 +1006,227 @@ END(mcount)
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#include "syscall_table_32.S"
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syscall_table_size=(.-sys_call_table)
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/*
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* Some functions should be protected against kprobes
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*/
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.pushsection .kprobes.text, "ax"
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ENTRY(page_fault)
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RING0_EC_FRAME
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pushl $do_page_fault
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CFI_ADJUST_CFA_OFFSET 4
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ALIGN
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error_code:
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/* the function address is in %fs's slot on the stack */
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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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cld
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pushl %fs
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CFI_ADJUST_CFA_OFFSET 4
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/*CFI_REL_OFFSET fs, 0*/
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movl $(__KERNEL_PERCPU), %ecx
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movl %ecx, %fs
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UNWIND_ESPFIX_STACK
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popl %ecx
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CFI_ADJUST_CFA_OFFSET -4
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/*CFI_REGISTER es, ecx*/
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movl PT_FS(%esp), %edi # get the function address
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movl PT_ORIG_EAX(%esp), %edx # get the error code
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movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart
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mov %ecx, PT_FS(%esp)
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/*CFI_REL_OFFSET fs, ES*/
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movl $(__USER_DS), %ecx
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movl %ecx, %ds
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movl %ecx, %es
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TRACE_IRQS_OFF
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movl %esp,%eax # pt_regs pointer
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call *%edi
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jmp ret_from_exception
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CFI_ENDPROC
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END(page_fault)
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/*
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* Debug traps and NMI can happen at the one SYSENTER instruction
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* that sets up the real kernel stack. Check here, since we can't
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* allow the wrong stack to be used.
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*
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* "TSS_sysenter_sp0+12" is because the NMI/debug handler will have
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* already pushed 3 words if it hits on the sysenter instruction:
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* eflags, cs and eip.
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*
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* We just load the right stack, and push the three (known) values
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* by hand onto the new stack - while updating the return eip past
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* the instruction that would have done it for sysenter.
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*/
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#define FIX_STACK(offset, ok, label) \
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cmpw $__KERNEL_CS,4(%esp); \
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jne ok; \
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label: \
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movl TSS_sysenter_sp0+offset(%esp),%esp; \
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CFI_DEF_CFA esp, 0; \
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CFI_UNDEFINED eip; \
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pushfl; \
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CFI_ADJUST_CFA_OFFSET 4; \
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pushl $__KERNEL_CS; \
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CFI_ADJUST_CFA_OFFSET 4; \
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pushl $sysenter_past_esp; \
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CFI_ADJUST_CFA_OFFSET 4; \
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CFI_REL_OFFSET eip, 0
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ENTRY(debug)
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RING0_INT_FRAME
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cmpl $ia32_sysenter_target,(%esp)
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jne debug_stack_correct
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FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
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debug_stack_correct:
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pushl $-1 # mark this as an int
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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TRACE_IRQS_OFF
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xorl %edx,%edx # error code 0
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movl %esp,%eax # pt_regs pointer
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call do_debug
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jmp ret_from_exception
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CFI_ENDPROC
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END(debug)
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/*
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* NMI is doubly nasty. It can happen _while_ we're handling
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* a debug fault, and the debug fault hasn't yet been able to
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* clear up the stack. So we first check whether we got an
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* NMI on the sysenter entry path, but after that we need to
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* check whether we got an NMI on the debug path where the debug
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* fault happened on the sysenter path.
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*/
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ENTRY(nmi)
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RING0_INT_FRAME
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pushl %eax
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CFI_ADJUST_CFA_OFFSET 4
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movl %ss, %eax
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cmpw $__ESPFIX_SS, %ax
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popl %eax
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CFI_ADJUST_CFA_OFFSET -4
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je nmi_espfix_stack
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cmpl $ia32_sysenter_target,(%esp)
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je nmi_stack_fixup
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pushl %eax
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CFI_ADJUST_CFA_OFFSET 4
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movl %esp,%eax
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/* Do not access memory above the end of our stack page,
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* it might not exist.
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*/
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andl $(THREAD_SIZE-1),%eax
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cmpl $(THREAD_SIZE-20),%eax
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popl %eax
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CFI_ADJUST_CFA_OFFSET -4
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jae nmi_stack_correct
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cmpl $ia32_sysenter_target,12(%esp)
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je nmi_debug_stack_check
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nmi_stack_correct:
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/* We have a RING0_INT_FRAME here */
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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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TRACE_IRQS_OFF
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xorl %edx,%edx # zero error code
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movl %esp,%eax # pt_regs pointer
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call do_nmi
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jmp restore_nocheck_notrace
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CFI_ENDPROC
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nmi_stack_fixup:
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RING0_INT_FRAME
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FIX_STACK(12,nmi_stack_correct, 1)
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jmp nmi_stack_correct
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nmi_debug_stack_check:
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/* We have a RING0_INT_FRAME here */
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cmpw $__KERNEL_CS,16(%esp)
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jne nmi_stack_correct
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cmpl $debug,(%esp)
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jb nmi_stack_correct
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cmpl $debug_esp_fix_insn,(%esp)
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ja nmi_stack_correct
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FIX_STACK(24,nmi_stack_correct, 1)
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jmp nmi_stack_correct
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nmi_espfix_stack:
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/* We have a RING0_INT_FRAME here.
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*
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* create the pointer to lss back
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*/
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pushl %ss
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CFI_ADJUST_CFA_OFFSET 4
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pushl %esp
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CFI_ADJUST_CFA_OFFSET 4
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addw $4, (%esp)
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/* copy the iret frame of 12 bytes */
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.rept 3
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pushl 16(%esp)
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CFI_ADJUST_CFA_OFFSET 4
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.endr
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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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TRACE_IRQS_OFF
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FIXUP_ESPFIX_STACK # %eax == %esp
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xorl %edx,%edx # zero error code
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call do_nmi
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RESTORE_REGS
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lss 12+4(%esp), %esp # back to espfix stack
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CFI_ADJUST_CFA_OFFSET -24
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jmp irq_return
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CFI_ENDPROC
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END(nmi)
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ENTRY(int3)
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RING0_INT_FRAME
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pushl $-1 # mark this as an int
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CFI_ADJUST_CFA_OFFSET 4
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SAVE_ALL
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TRACE_IRQS_OFF
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xorl %edx,%edx # zero error code
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movl %esp,%eax # pt_regs pointer
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call do_int3
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jmp ret_from_exception
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CFI_ENDPROC
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END(int3)
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|
||||
ENTRY(general_protection)
|
||||
RING0_EC_FRAME
|
||||
pushl $do_general_protection
|
||||
CFI_ADJUST_CFA_OFFSET 4
|
||||
jmp error_code
|
||||
CFI_ENDPROC
|
||||
END(general_protection)
|
||||
|
||||
/*
|
||||
* End of kprobes section
|
||||
*/
|
||||
.popsection
|
||||
|
|
|
|||
|
|
@ -64,14 +64,6 @@
|
|||
name:
|
||||
#endif
|
||||
|
||||
#define KPROBE_ENTRY(name) \
|
||||
.pushsection .kprobes.text, "ax"; \
|
||||
ENTRY(name)
|
||||
|
||||
#define KPROBE_END(name) \
|
||||
END(name); \
|
||||
.popsection
|
||||
|
||||
#ifndef END
|
||||
#define END(name) \
|
||||
.size name, .-name
|
||||
|
|
|
|||
Loading…
Reference in a new issue