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9e56529227
The newer assemblers support the .cfi_sections directive so we can put the CFI from .S files into the .debug_frame section that is preserved in unstripped vmlinux and in separate debuginfo, rather than the .eh_frame section that is now discarded by vmlinux.lds.S. Signed-off-by: Roland McGrath <roland@redhat.com> LKML-Reference: <20100514044303.A6FE7400BE@magilla.sf.frob.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
125 lines
3.1 KiB
C
125 lines
3.1 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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#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_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 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 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 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 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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