forked from Minki/linux
49db46a67b
Sequences:
pushl_cfi %reg
CFI_REL_OFFSET reg, 0
and:
popl_cfi %reg
CFI_RESTORE reg
happen quite often. This patch adds macros which generate them.
No assembly changes (verified with objdump -dr vmlinux.o).
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1421017655-25561-1-git-send-email-dvlasenk@redhat.com
Link: http://lkml.kernel.org/r/2202eb90f175cf45d1b2d1c64dbb5676a8ad07ad.1424989793.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
171 lines
3.7 KiB
C
171 lines
3.7 KiB
C
#ifndef _ASM_X86_DWARF2_H
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#define _ASM_X86_DWARF2_H
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#ifndef __ASSEMBLY__
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#warning "asm/dwarf2.h should be only included in pure assembly files"
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#endif
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/*
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* Macros for dwarf2 CFI unwind table entries.
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* See "as.info" for details on these pseudo ops. Unfortunately
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* they are only supported in very new binutils, so define them
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* away for older version.
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*/
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#ifdef CONFIG_AS_CFI
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#define CFI_STARTPROC .cfi_startproc
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#define CFI_ENDPROC .cfi_endproc
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#define CFI_DEF_CFA .cfi_def_cfa
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#define CFI_DEF_CFA_REGISTER .cfi_def_cfa_register
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#define CFI_DEF_CFA_OFFSET .cfi_def_cfa_offset
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#define CFI_ADJUST_CFA_OFFSET .cfi_adjust_cfa_offset
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#define CFI_OFFSET .cfi_offset
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#define CFI_REL_OFFSET .cfi_rel_offset
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#define CFI_REGISTER .cfi_register
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#define CFI_RESTORE .cfi_restore
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#define CFI_REMEMBER_STATE .cfi_remember_state
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#define CFI_RESTORE_STATE .cfi_restore_state
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#define CFI_UNDEFINED .cfi_undefined
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#define CFI_ESCAPE .cfi_escape
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#ifdef CONFIG_AS_CFI_SIGNAL_FRAME
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#define CFI_SIGNAL_FRAME .cfi_signal_frame
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#else
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#define CFI_SIGNAL_FRAME
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#endif
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#if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
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/*
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* Emit CFI data in .debug_frame sections, not .eh_frame sections.
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* The latter we currently just discard since we don't do DWARF
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* unwinding at runtime. So only the offline DWARF information is
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* useful to anyone. Note we should not use this directive if this
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* file is used in the vDSO assembly, or if vmlinux.lds.S gets
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* changed so it doesn't discard .eh_frame.
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*/
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.cfi_sections .debug_frame
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#endif
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#else
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/*
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* Due to the structure of pre-exisiting code, don't use assembler line
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* comment character # to ignore the arguments. Instead, use a dummy macro.
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*/
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.macro cfi_ignore a=0, b=0, c=0, d=0
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.endm
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#define CFI_STARTPROC cfi_ignore
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#define CFI_ENDPROC cfi_ignore
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#define CFI_DEF_CFA cfi_ignore
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#define CFI_DEF_CFA_REGISTER cfi_ignore
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#define CFI_DEF_CFA_OFFSET cfi_ignore
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#define CFI_ADJUST_CFA_OFFSET cfi_ignore
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#define CFI_OFFSET cfi_ignore
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#define CFI_REL_OFFSET cfi_ignore
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#define CFI_REGISTER cfi_ignore
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#define CFI_RESTORE cfi_ignore
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#define CFI_REMEMBER_STATE cfi_ignore
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#define CFI_RESTORE_STATE cfi_ignore
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#define CFI_UNDEFINED cfi_ignore
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#define CFI_ESCAPE cfi_ignore
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#define CFI_SIGNAL_FRAME cfi_ignore
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#endif
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/*
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* An attempt to make CFI annotations more or less
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* correct and shorter. It is implied that you know
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* what you're doing if you use them.
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*/
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#ifdef __ASSEMBLY__
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#ifdef CONFIG_X86_64
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.macro pushq_cfi reg
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pushq \reg
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CFI_ADJUST_CFA_OFFSET 8
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.endm
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.macro pushq_cfi_reg reg
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pushq %\reg
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CFI_ADJUST_CFA_OFFSET 8
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CFI_REL_OFFSET \reg, 0
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.endm
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.macro popq_cfi reg
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popq \reg
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CFI_ADJUST_CFA_OFFSET -8
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.endm
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.macro popq_cfi_reg reg
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popq %\reg
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CFI_ADJUST_CFA_OFFSET -8
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CFI_RESTORE \reg
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.endm
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.macro pushfq_cfi
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pushfq
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CFI_ADJUST_CFA_OFFSET 8
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.endm
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.macro popfq_cfi
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popfq
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CFI_ADJUST_CFA_OFFSET -8
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.endm
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.macro movq_cfi reg offset=0
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movq %\reg, \offset(%rsp)
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CFI_REL_OFFSET \reg, \offset
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.endm
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.macro movq_cfi_restore offset reg
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movq \offset(%rsp), %\reg
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CFI_RESTORE \reg
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.endm
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#else /*!CONFIG_X86_64*/
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.macro pushl_cfi reg
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pushl \reg
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CFI_ADJUST_CFA_OFFSET 4
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.endm
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.macro pushl_cfi_reg reg
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pushl %\reg
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CFI_ADJUST_CFA_OFFSET 4
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CFI_REL_OFFSET \reg, 0
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.endm
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.macro popl_cfi reg
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popl \reg
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CFI_ADJUST_CFA_OFFSET -4
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.endm
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.macro popl_cfi_reg reg
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popl %\reg
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CFI_ADJUST_CFA_OFFSET -4
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CFI_RESTORE \reg
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.endm
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.macro pushfl_cfi
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pushfl
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CFI_ADJUST_CFA_OFFSET 4
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.endm
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.macro popfl_cfi
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popfl
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CFI_ADJUST_CFA_OFFSET -4
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.endm
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.macro movl_cfi reg offset=0
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movl %\reg, \offset(%esp)
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CFI_REL_OFFSET \reg, \offset
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.endm
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.macro movl_cfi_restore offset reg
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movl \offset(%esp), %\reg
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CFI_RESTORE \reg
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.endm
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#endif /*!CONFIG_X86_64*/
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#endif /*__ASSEMBLY__*/
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#endif /* _ASM_X86_DWARF2_H */
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