arch/x86/include/asm/dwarf2.h

   1 #ifndef _ASM_X86_DWARF2_H
   2 #define _ASM_X86_DWARF2_H
   3
   4 #ifndef __ASSEMBLY__
   5 #warning "asm/dwarf2.h should be only included in pure assembly files"
   6 #endif
   7
   8 /*
   9  * Macros for dwarf2 CFI unwind table entries.
  10  * See "as.info" for details on these pseudo ops. Unfortunately
  11  * they are only supported in very new binutils, so define them
  12  * away for older version.
  13  */
  14
  15 #ifdef CONFIG_AS_CFI
  16
  17 #define CFI_STARTPROC           .cfi_startproc
  18 #define CFI_ENDPROC             .cfi_endproc
  19 #define CFI_DEF_CFA             .cfi_def_cfa
  20 #define CFI_DEF_CFA_REGISTER    .cfi_def_cfa_register
  21 #define CFI_DEF_CFA_OFFSET      .cfi_def_cfa_offset
  22 #define CFI_ADJUST_CFA_OFFSET   .cfi_adjust_cfa_offset
  23 #define CFI_OFFSET              .cfi_offset
  24 #define CFI_REL_OFFSET          .cfi_rel_offset
  25 #define CFI_REGISTER            .cfi_register
  26 #define CFI_RESTORE             .cfi_restore
  27 #define CFI_REMEMBER_STATE      .cfi_remember_state
  28 #define CFI_RESTORE_STATE       .cfi_restore_state
  29 #define CFI_UNDEFINED           .cfi_undefined
  30
  31 #ifdef CONFIG_AS_CFI_SIGNAL_FRAME
  32 #define CFI_SIGNAL_FRAME        .cfi_signal_frame
  33 #else
  34 #define CFI_SIGNAL_FRAME
  35 #endif
  36
  37 #if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
  38         /*
  39          * Emit CFI data in .debug_frame sections, not .eh_frame sections.
  40          * The latter we currently just discard since we don't do DWARF
  41          * unwinding at runtime.  So only the offline DWARF information is
  42          * useful to anyone.  Note we should not use this directive if this
  43          * file is used in the vDSO assembly, or if vmlinux.lds.S gets
  44          * changed so it doesn't discard .eh_frame.
  45          */
  46         .cfi_sections .debug_frame
  47 #endif
  48
  49 #else
  50
  51 /*
  52  * Due to the structure of pre-exisiting code, don't use assembler line
  53  * comment character # to ignore the arguments. Instead, use a dummy macro.
  54  */
  55 .macro cfi_ignore a=0, b=0, c=0, d=0
  56 .endm
  57
  58 #define CFI_STARTPROC           cfi_ignore
  59 #define CFI_ENDPROC             cfi_ignore
  60 #define CFI_DEF_CFA             cfi_ignore
  61 #define CFI_DEF_CFA_REGISTER    cfi_ignore
  62 #define CFI_DEF_CFA_OFFSET      cfi_ignore
  63 #define CFI_ADJUST_CFA_OFFSET   cfi_ignore
  64 #define CFI_OFFSET              cfi_ignore
  65 #define CFI_REL_OFFSET          cfi_ignore
  66 #define CFI_REGISTER            cfi_ignore
  67 #define CFI_RESTORE             cfi_ignore
  68 #define CFI_REMEMBER_STATE      cfi_ignore
  69 #define CFI_RESTORE_STATE       cfi_ignore
  70 #define CFI_UNDEFINED           cfi_ignore
  71 #define CFI_SIGNAL_FRAME        cfi_ignore
  72
  73 #endif
  74
  75 /*
  76  * An attempt to make CFI annotations more or less
  77  * correct and shorter. It is implied that you know
  78  * what you're doing if you use them.
  79  */
  80 #ifdef __ASSEMBLY__
  81 #ifdef CONFIG_X86_64
  82         .macro pushq_cfi reg
  83         pushq \reg
  84         CFI_ADJUST_CFA_OFFSET 8
  85         .endm
  86
  87         .macro popq_cfi reg
  88         popq \reg
  89         CFI_ADJUST_CFA_OFFSET -8
  90         .endm
  91
  92         .macro pushfq_cfi
  93         pushfq
  94         CFI_ADJUST_CFA_OFFSET 8
  95         .endm
  96
  97         .macro popfq_cfi
  98         popfq
  99         CFI_ADJUST_CFA_OFFSET -8
 100         .endm
 101
 102         .macro movq_cfi reg offset=0
 103         movq %\reg, \offset(%rsp)
 104         CFI_REL_OFFSET \reg, \offset
 105         .endm
 106
 107         .macro movq_cfi_restore offset reg
 108         movq \offset(%rsp), %\reg
 109         CFI_RESTORE \reg
 110         .endm
 111 #else /*!CONFIG_X86_64*/
 112         .macro pushl_cfi reg
 113         pushl \reg
 114         CFI_ADJUST_CFA_OFFSET 4
 115         .endm
 116
 117         .macro popl_cfi reg
 118         popl \reg
 119         CFI_ADJUST_CFA_OFFSET -4
 120         .endm
 121
 122         .macro pushfl_cfi
 123         pushfl
 124         CFI_ADJUST_CFA_OFFSET 4
 125         .endm
 126
 127         .macro popfl_cfi
 128         popfl
 129         CFI_ADJUST_CFA_OFFSET -4
 130         .endm
 131
 132         .macro movl_cfi reg offset=0
 133         movl %\reg, \offset(%esp)
 134         CFI_REL_OFFSET \reg, \offset
 135         .endm
 136
 137         .macro movl_cfi_restore offset reg
 138         movl \offset(%esp), %\reg
 139         CFI_RESTORE \reg
 140         .endm
 141 #endif /*!CONFIG_X86_64*/
 142 #endif /*__ASSEMBLY__*/
 143
 144 #endif /* _ASM_X86_DWARF2_H */