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 #define CFI_ESCAPE              .cfi_escape
  31
  32 #ifdef CONFIG_AS_CFI_SIGNAL_FRAME
  33 #define CFI_SIGNAL_FRAME        .cfi_signal_frame
  34 #else
  35 #define CFI_SIGNAL_FRAME
  36 #endif
  37
  38 #if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
  39         /*
  40          * Emit CFI data in .debug_frame sections, not .eh_frame sections.
  41          * The latter we currently just discard since we don't do DWARF
  42          * unwinding at runtime.  So only the offline DWARF information is
  43          * useful to anyone.  Note we should not use this directive if this
  44          * file is used in the vDSO assembly, or if vmlinux.lds.S gets
  45          * changed so it doesn't discard .eh_frame.
  46          */
  47         .cfi_sections .debug_frame
  48 #endif
  49
  50 #else
  51
  52 /*
  53  * Due to the structure of pre-exisiting code, don't use assembler line
  54  * comment character # to ignore the arguments. Instead, use a dummy macro.
  55  */
  56 .macro cfi_ignore a=0, b=0, c=0, d=0
  57 .endm
  58
  59 #define CFI_STARTPROC           cfi_ignore
  60 #define CFI_ENDPROC             cfi_ignore
  61 #define CFI_DEF_CFA             cfi_ignore
  62 #define CFI_DEF_CFA_REGISTER    cfi_ignore
  63 #define CFI_DEF_CFA_OFFSET      cfi_ignore
  64 #define CFI_ADJUST_CFA_OFFSET   cfi_ignore
  65 #define CFI_OFFSET              cfi_ignore
  66 #define CFI_REL_OFFSET          cfi_ignore
  67 #define CFI_REGISTER            cfi_ignore
  68 #define CFI_RESTORE             cfi_ignore
  69 #define CFI_REMEMBER_STATE      cfi_ignore
  70 #define CFI_RESTORE_STATE       cfi_ignore
  71 #define CFI_UNDEFINED           cfi_ignore
  72 #define CFI_ESCAPE              cfi_ignore
  73 #define CFI_SIGNAL_FRAME        cfi_ignore
  74
  75 #endif
  76
  77 /*
  78  * An attempt to make CFI annotations more or less
  79  * correct and shorter. It is implied that you know
  80  * what you're doing if you use them.
  81  */
  82 #ifdef __ASSEMBLY__
  83 #ifdef CONFIG_X86_64
  84         .macro pushq_cfi reg
  85         pushq \reg
  86         CFI_ADJUST_CFA_OFFSET 8
  87         .endm
  88
  89         .macro popq_cfi reg
  90         popq \reg
  91         CFI_ADJUST_CFA_OFFSET -8
  92         .endm
  93
  94         .macro pushfq_cfi
  95         pushfq
  96         CFI_ADJUST_CFA_OFFSET 8
  97         .endm
  98
  99         .macro popfq_cfi
 100         popfq
 101         CFI_ADJUST_CFA_OFFSET -8
 102         .endm
 103
 104         .macro movq_cfi reg offset=0
 105         movq %\reg, \offset(%rsp)
 106         CFI_REL_OFFSET \reg, \offset
 107         .endm
 108
 109         .macro movq_cfi_restore offset reg
 110         movq \offset(%rsp), %\reg
 111         CFI_RESTORE \reg
 112         .endm
 113 #else /*!CONFIG_X86_64*/
 114         .macro pushl_cfi reg
 115         pushl \reg
 116         CFI_ADJUST_CFA_OFFSET 4
 117         .endm
 118
 119         .macro popl_cfi reg
 120         popl \reg
 121         CFI_ADJUST_CFA_OFFSET -4
 122         .endm
 123
 124         .macro pushfl_cfi
 125         pushfl
 126         CFI_ADJUST_CFA_OFFSET 4
 127         .endm
 128
 129         .macro popfl_cfi
 130         popfl
 131         CFI_ADJUST_CFA_OFFSET -4
 132         .endm
 133
 134         .macro movl_cfi reg offset=0
 135         movl %\reg, \offset(%esp)
 136         CFI_REL_OFFSET \reg, \offset
 137         .endm
 138
 139         .macro movl_cfi_restore offset reg
 140         movl \offset(%esp), %\reg
 141         CFI_RESTORE \reg
 142         .endm
 143 #endif /*!CONFIG_X86_64*/
 144 #endif /*__ASSEMBLY__*/
 145
 146 #endif /* _ASM_X86_DWARF2_H */