root/arch/x86/include/asm/dwarf2.h

INCLUDED FROM

#ifndef _ASM_X86_DWARF2_H
#define _ASM_X86_DWARF2_H

#ifndef __ASSEMBLY__
#warning "asm/dwarf2.h should be only included in pure assembly files"
#endif

/*
 * Macros for dwarf2 CFI unwind table entries.
 * See "as.info" for details on these pseudo ops. Unfortunately
 * they are only supported in very new binutils, so define them
 * away for older version.
 */

#ifdef CONFIG_AS_CFI

#define CFI_STARTPROC           .cfi_startproc
#define CFI_ENDPROC             .cfi_endproc
#define CFI_DEF_CFA             .cfi_def_cfa
#define CFI_DEF_CFA_REGISTER    .cfi_def_cfa_register
#define CFI_DEF_CFA_OFFSET      .cfi_def_cfa_offset
#define CFI_ADJUST_CFA_OFFSET   .cfi_adjust_cfa_offset
#define CFI_OFFSET              .cfi_offset
#define CFI_REL_OFFSET          .cfi_rel_offset
#define CFI_REGISTER            .cfi_register
#define CFI_RESTORE             .cfi_restore
#define CFI_REMEMBER_STATE      .cfi_remember_state
#define CFI_RESTORE_STATE       .cfi_restore_state
#define CFI_UNDEFINED           .cfi_undefined
#define CFI_ESCAPE              .cfi_escape

#ifdef CONFIG_AS_CFI_SIGNAL_FRAME
#define CFI_SIGNAL_FRAME        .cfi_signal_frame
#else
#define CFI_SIGNAL_FRAME
#endif

#if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
        /*
         * Emit CFI data in .debug_frame sections, not .eh_frame sections.
         * The latter we currently just discard since we don't do DWARF
         * unwinding at runtime.  So only the offline DWARF information is
         * useful to anyone.  Note we should not use this directive if this
         * file is used in the vDSO assembly, or if vmlinux.lds.S gets
         * changed so it doesn't discard .eh_frame.
         */
        .cfi_sections .debug_frame
#endif

#else

/*
 * Due to the structure of pre-exisiting code, don't use assembler line
 * comment character # to ignore the arguments. Instead, use a dummy macro.
 */
.macro cfi_ignore a=0, b=0, c=0, d=0
.endm

#define CFI_STARTPROC           cfi_ignore
#define CFI_ENDPROC             cfi_ignore
#define CFI_DEF_CFA             cfi_ignore
#define CFI_DEF_CFA_REGISTER    cfi_ignore
#define CFI_DEF_CFA_OFFSET      cfi_ignore
#define CFI_ADJUST_CFA_OFFSET   cfi_ignore
#define CFI_OFFSET              cfi_ignore
#define CFI_REL_OFFSET          cfi_ignore
#define CFI_REGISTER            cfi_ignore
#define CFI_RESTORE             cfi_ignore
#define CFI_REMEMBER_STATE      cfi_ignore
#define CFI_RESTORE_STATE       cfi_ignore
#define CFI_UNDEFINED           cfi_ignore
#define CFI_ESCAPE              cfi_ignore
#define CFI_SIGNAL_FRAME        cfi_ignore

#endif

/*
 * An attempt to make CFI annotations more or less
 * correct and shorter. It is implied that you know
 * what you're doing if you use them.
 */
#ifdef __ASSEMBLY__
#ifdef CONFIG_X86_64
        .macro pushq_cfi reg
        pushq \reg
        CFI_ADJUST_CFA_OFFSET 8
        .endm

        .macro popq_cfi reg
        popq \reg
        CFI_ADJUST_CFA_OFFSET -8
        .endm

        .macro pushfq_cfi
        pushfq
        CFI_ADJUST_CFA_OFFSET 8
        .endm

        .macro popfq_cfi
        popfq
        CFI_ADJUST_CFA_OFFSET -8
        .endm

        .macro movq_cfi reg offset=0
        movq %\reg, \offset(%rsp)
        CFI_REL_OFFSET \reg, \offset
        .endm

        .macro movq_cfi_restore offset reg
        movq \offset(%rsp), %\reg
        CFI_RESTORE \reg
        .endm
#else /*!CONFIG_X86_64*/
        .macro pushl_cfi reg
        pushl \reg
        CFI_ADJUST_CFA_OFFSET 4
        .endm

        .macro popl_cfi reg
        popl \reg
        CFI_ADJUST_CFA_OFFSET -4
        .endm

        .macro pushfl_cfi
        pushfl
        CFI_ADJUST_CFA_OFFSET 4
        .endm

        .macro popfl_cfi
        popfl
        CFI_ADJUST_CFA_OFFSET -4
        .endm

        .macro movl_cfi reg offset=0
        movl %\reg, \offset(%esp)
        CFI_REL_OFFSET \reg, \offset
        .endm

        .macro movl_cfi_restore offset reg
        movl \offset(%esp), %\reg
        CFI_RESTORE \reg
        .endm
#endif /*!CONFIG_X86_64*/
#endif /*__ASSEMBLY__*/

#endif /* _ASM_X86_DWARF2_H */