arch/x86/include/asm/dwarf2.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_DWARF2_H
   3 #define _ASM_X86_DWARF2_H
   4
   5 #ifndef __ASSEMBLY__
   6 #warning "asm/dwarf2.h should be only included in pure assembly files"
   7 #endif
   8
   9 /*
  10  * Macros for dwarf2 CFI unwind table entries.
  11  * See "as.info" for details on these pseudo ops. Unfortunately
  12  * they are only supported in very new binutils, so define them
  13  * away for older version.
  14  */
  15
  16 #ifdef CONFIG_AS_CFI
  17
  18 #define CFI_STARTPROC           .cfi_startproc
  19 #define CFI_ENDPROC             .cfi_endproc
  20 #define CFI_DEF_CFA             .cfi_def_cfa
  21 #define CFI_DEF_CFA_REGISTER    .cfi_def_cfa_register
  22 #define CFI_DEF_CFA_OFFSET      .cfi_def_cfa_offset
  23 #define CFI_ADJUST_CFA_OFFSET   .cfi_adjust_cfa_offset
  24 #define CFI_OFFSET              .cfi_offset
  25 #define CFI_REL_OFFSET          .cfi_rel_offset
  26 #define CFI_REGISTER            .cfi_register
  27 #define CFI_RESTORE             .cfi_restore
  28 #define CFI_REMEMBER_STATE      .cfi_remember_state
  29 #define CFI_RESTORE_STATE       .cfi_restore_state
  30 #define CFI_UNDEFINED           .cfi_undefined
  31 #define CFI_ESCAPE              .cfi_escape
  32
  33 #ifdef CONFIG_AS_CFI_SIGNAL_FRAME
  34 #define CFI_SIGNAL_FRAME        .cfi_signal_frame
  35 #else
  36 #define CFI_SIGNAL_FRAME
  37 #endif
  38
  39 #if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
  40 #ifndef BUILD_VDSO
  41         /*
  42          * Emit CFI data in .debug_frame sections, not .eh_frame sections.
  43          * The latter we currently just discard since we don't do DWARF
  44          * unwinding at runtime.  So only the offline DWARF information is
  45          * useful to anyone.  Note we should not use this directive if
  46          * vmlinux.lds.S gets changed so it doesn't discard .eh_frame.
  47          */
  48         .cfi_sections .debug_frame
  49 #else
  50          /*
  51           * For the vDSO, emit both runtime unwind information and debug
  52           * symbols for the .dbg file.
  53           */
  54         .cfi_sections .eh_frame, .debug_frame
  55 #endif
  56 #endif
  57
  58 #else
  59
  60 /*
  61  * Due to the structure of pre-exisiting code, don't use assembler line
  62  * comment character # to ignore the arguments. Instead, use a dummy macro.
  63  */
  64 .macro cfi_ignore a=0, b=0, c=0, d=0
  65 .endm
  66
  67 #define CFI_STARTPROC           cfi_ignore
  68 #define CFI_ENDPROC             cfi_ignore
  69 #define CFI_DEF_CFA             cfi_ignore
  70 #define CFI_DEF_CFA_REGISTER    cfi_ignore
  71 #define CFI_DEF_CFA_OFFSET      cfi_ignore
  72 #define CFI_ADJUST_CFA_OFFSET   cfi_ignore
  73 #define CFI_OFFSET              cfi_ignore
  74 #define CFI_REL_OFFSET          cfi_ignore
  75 #define CFI_REGISTER            cfi_ignore
  76 #define CFI_RESTORE             cfi_ignore
  77 #define CFI_REMEMBER_STATE      cfi_ignore
  78 #define CFI_RESTORE_STATE       cfi_ignore
  79 #define CFI_UNDEFINED           cfi_ignore
  80 #define CFI_ESCAPE              cfi_ignore
  81 #define CFI_SIGNAL_FRAME        cfi_ignore
  82
  83 #endif
  84
  85 #endif /* _ASM_X86_DWARF2_H */