arch/sh/include/asm/dwarf.h

   1 /*
   2  * Copyright (C) 2009 Matt Fleming <matt@console-pimps.org>
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  */
   9 #ifndef __ASM_SH_DWARF_H
  10 #define __ASM_SH_DWARF_H
  11
  12 #ifdef CONFIG_DWARF_UNWINDER
  13
  14 /*
  15  * DWARF expression operations
  16  */
  17 #define DW_OP_addr      0x03
  18 #define DW_OP_deref     0x06
  19 #define DW_OP_const1u   0x08
  20 #define DW_OP_const1s   0x09
  21 #define DW_OP_const2u   0x0a
  22 #define DW_OP_const2s   0x0b
  23 #define DW_OP_const4u   0x0c
  24 #define DW_OP_const4s   0x0d
  25 #define DW_OP_const8u   0x0e
  26 #define DW_OP_const8s   0x0f
  27 #define DW_OP_constu    0x10
  28 #define DW_OP_consts    0x11
  29 #define DW_OP_dup       0x12
  30 #define DW_OP_drop      0x13
  31 #define DW_OP_over      0x14
  32 #define DW_OP_pick      0x15
  33 #define DW_OP_swap      0x16
  34 #define DW_OP_rot       0x17
  35 #define DW_OP_xderef    0x18
  36 #define DW_OP_abs       0x19
  37 #define DW_OP_and       0x1a
  38 #define DW_OP_div       0x1b
  39 #define DW_OP_minus     0x1c
  40 #define DW_OP_mod       0x1d
  41 #define DW_OP_mul       0x1e
  42 #define DW_OP_neg       0x1f
  43 #define DW_OP_not       0x20
  44 #define DW_OP_or        0x21
  45 #define DW_OP_plus      0x22
  46 #define DW_OP_plus_uconst       0x23
  47 #define DW_OP_shl       0x24
  48 #define DW_OP_shr       0x25
  49 #define DW_OP_shra      0x26
  50 #define DW_OP_xor       0x27
  51 #define DW_OP_skip      0x2f
  52 #define DW_OP_bra       0x28
  53 #define DW_OP_eq        0x29
  54 #define DW_OP_ge        0x2a
  55 #define DW_OP_gt        0x2b
  56 #define DW_OP_le        0x2c
  57 #define DW_OP_lt        0x2d
  58 #define DW_OP_ne        0x2e
  59 #define DW_OP_lit0      0x30
  60 #define DW_OP_lit1      0x31
  61 #define DW_OP_lit2      0x32
  62 #define DW_OP_lit3      0x33
  63 #define DW_OP_lit4      0x34
  64 #define DW_OP_lit5      0x35
  65 #define DW_OP_lit6      0x36
  66 #define DW_OP_lit7      0x37
  67 #define DW_OP_lit8      0x38
  68 #define DW_OP_lit9      0x39
  69 #define DW_OP_lit10     0x3a
  70 #define DW_OP_lit11     0x3b
  71 #define DW_OP_lit12     0x3c
  72 #define DW_OP_lit13     0x3d
  73 #define DW_OP_lit14     0x3e
  74 #define DW_OP_lit15     0x3f
  75 #define DW_OP_lit16     0x40
  76 #define DW_OP_lit17     0x41
  77 #define DW_OP_lit18     0x42
  78 #define DW_OP_lit19     0x43
  79 #define DW_OP_lit20     0x44
  80 #define DW_OP_lit21     0x45
  81 #define DW_OP_lit22     0x46
  82 #define DW_OP_lit23     0x47
  83 #define DW_OP_lit24     0x48
  84 #define DW_OP_lit25     0x49
  85 #define DW_OP_lit26     0x4a
  86 #define DW_OP_lit27     0x4b
  87 #define DW_OP_lit28     0x4c
  88 #define DW_OP_lit29     0x4d
  89 #define DW_OP_lit30     0x4e
  90 #define DW_OP_lit31     0x4f
  91 #define DW_OP_reg0      0x50
  92 #define DW_OP_reg1      0x51
  93 #define DW_OP_reg2      0x52
  94 #define DW_OP_reg3      0x53
  95 #define DW_OP_reg4      0x54
  96 #define DW_OP_reg5      0x55
  97 #define DW_OP_reg6      0x56
  98 #define DW_OP_reg7      0x57
  99 #define DW_OP_reg8      0x58
 100 #define DW_OP_reg9      0x59
 101 #define DW_OP_reg10     0x5a
 102 #define DW_OP_reg11     0x5b
 103 #define DW_OP_reg12     0x5c
 104 #define DW_OP_reg13     0x5d
 105 #define DW_OP_reg14     0x5e
 106 #define DW_OP_reg15     0x5f
 107 #define DW_OP_reg16     0x60
 108 #define DW_OP_reg17     0x61
 109 #define DW_OP_reg18     0x62
 110 #define DW_OP_reg19     0x63
 111 #define DW_OP_reg20     0x64
 112 #define DW_OP_reg21     0x65
 113 #define DW_OP_reg22     0x66
 114 #define DW_OP_reg23     0x67
 115 #define DW_OP_reg24     0x68
 116 #define DW_OP_reg25     0x69
 117 #define DW_OP_reg26     0x6a
 118 #define DW_OP_reg27     0x6b
 119 #define DW_OP_reg28     0x6c
 120 #define DW_OP_reg29     0x6d
 121 #define DW_OP_reg30     0x6e
 122 #define DW_OP_reg31     0x6f
 123 #define DW_OP_breg0     0x70
 124 #define DW_OP_breg1     0x71
 125 #define DW_OP_breg2     0x72
 126 #define DW_OP_breg3     0x73
 127 #define DW_OP_breg4     0x74
 128 #define DW_OP_breg5     0x75
 129 #define DW_OP_breg6     0x76
 130 #define DW_OP_breg7     0x77
 131 #define DW_OP_breg8     0x78
 132 #define DW_OP_breg9     0x79
 133 #define DW_OP_breg10    0x7a
 134 #define DW_OP_breg11    0x7b
 135 #define DW_OP_breg12    0x7c
 136 #define DW_OP_breg13    0x7d
 137 #define DW_OP_breg14    0x7e
 138 #define DW_OP_breg15    0x7f
 139 #define DW_OP_breg16    0x80
 140 #define DW_OP_breg17    0x81
 141 #define DW_OP_breg18    0x82
 142 #define DW_OP_breg19    0x83
 143 #define DW_OP_breg20    0x84
 144 #define DW_OP_breg21    0x85
 145 #define DW_OP_breg22    0x86
 146 #define DW_OP_breg23    0x87
 147 #define DW_OP_breg24    0x88
 148 #define DW_OP_breg25    0x89
 149 #define DW_OP_breg26    0x8a
 150 #define DW_OP_breg27    0x8b
 151 #define DW_OP_breg28    0x8c
 152 #define DW_OP_breg29    0x8d
 153 #define DW_OP_breg30    0x8e
 154 #define DW_OP_breg31    0x8f
 155 #define DW_OP_regx      0x90
 156 #define DW_OP_fbreg     0x91
 157 #define DW_OP_bregx     0x92
 158 #define DW_OP_piece     0x93
 159 #define DW_OP_deref_size        0x94
 160 #define DW_OP_xderef_size       0x95
 161 #define DW_OP_nop       0x96
 162 #define DW_OP_push_object_address       0x97
 163 #define DW_OP_call2     0x98
 164 #define DW_OP_call4     0x99
 165 #define DW_OP_call_ref  0x9a
 166 #define DW_OP_form_tls_address  0x9b
 167 #define DW_OP_call_frame_cfa    0x9c
 168 #define DW_OP_bit_piece 0x9d
 169 #define DW_OP_lo_user   0xe0
 170 #define DW_OP_hi_user   0xff
 171
 172 /*
 173  * Addresses used in FDE entries in the .eh_frame section may be encoded
 174  * using one of the following encodings.
 175  */
 176 #define DW_EH_PE_absptr 0x00
 177 #define DW_EH_PE_omit   0xff
 178 #define DW_EH_PE_uleb128        0x01
 179 #define DW_EH_PE_udata2 0x02
 180 #define DW_EH_PE_udata4 0x03
 181 #define DW_EH_PE_udata8 0x04
 182 #define DW_EH_PE_sleb128        0x09
 183 #define DW_EH_PE_sdata2 0x0a
 184 #define DW_EH_PE_sdata4 0x0b
 185 #define DW_EH_PE_sdata8 0x0c
 186 #define DW_EH_PE_signed 0x09
 187
 188 #define DW_EH_PE_pcrel  0x10
 189
 190 /*
 191  * The architecture-specific register number that contains the return
 192  * address in the .debug_frame table.
 193  */
 194 #define DWARF_ARCH_RA_REG       17
 195
 196 #ifndef __ASSEMBLY__
 197 /*
 198  * Read either the frame pointer (r14) or the stack pointer (r15).
 199  * NOTE: this MUST be inlined.
 200  */
 201 static __always_inline unsigned long dwarf_read_arch_reg(unsigned int reg)
 202 {
 203         unsigned long value;
 204
 205         switch (reg) {
 206         case 14:
 207                 __asm__ __volatile__("mov r14, %0\n" : "=r" (value));
 208                 break;
 209         case 15:
 210                 __asm__ __volatile__("mov r15, %0\n" : "=r" (value));
 211                 break;
 212         default:
 213                 BUG();
 214         }
 215
 216         return value;
 217 }
 218
 219 /**
 220  *      dwarf_cie - Common Information Entry
 221  */
 222 struct dwarf_cie {
 223         unsigned long length;
 224         unsigned long cie_id;
 225         unsigned char version;
 226         const char *augmentation;
 227         unsigned int code_alignment_factor;
 228         int data_alignment_factor;
 229
 230         /* Which column in the rule table represents return addr of func. */
 231         unsigned int return_address_reg;
 232
 233         unsigned char *initial_instructions;
 234         unsigned char *instructions_end;
 235
 236         unsigned char encoding;
 237
 238         unsigned long cie_pointer;
 239
 240         struct list_head link;
 241
 242         unsigned long flags;
 243 #define DWARF_CIE_Z_AUGMENTATION        (1 << 0)
 244 };
 245
 246 /**
 247  *      dwarf_fde - Frame Description Entry
 248  */
 249 struct dwarf_fde {
 250         unsigned long length;
 251         unsigned long cie_pointer;
 252         struct dwarf_cie *cie;
 253         unsigned long initial_location;
 254         unsigned long address_range;
 255         unsigned char *instructions;
 256         unsigned char *end;
 257         struct list_head link;
 258 };
 259
 260 /**
 261  *      dwarf_frame - DWARF information for a frame in the call stack
 262  */
 263 struct dwarf_frame {
 264         struct dwarf_frame *prev, *next;
 265
 266         unsigned long pc;
 267
 268         struct dwarf_reg *regs;
 269         unsigned int num_regs;  /* how many regs are allocated? */
 270
 271         unsigned int depth;     /* what level are we in the callstack? */
 272
 273         unsigned long cfa;
 274
 275         /* Valid when DW_FRAME_CFA_REG_OFFSET is set in flags */
 276         unsigned int cfa_register;
 277         unsigned int cfa_offset;
 278
 279         /* Valid when DW_FRAME_CFA_REG_EXP is set in flags */
 280         unsigned char *cfa_expr;
 281         unsigned int cfa_expr_len;
 282
 283         unsigned long flags;
 284 #define DWARF_FRAME_CFA_REG_OFFSET      (1 << 0)
 285 #define DWARF_FRAME_CFA_REG_EXP         (1 << 1)
 286
 287         unsigned long return_addr;
 288 };
 289
 290 /**
 291  *      dwarf_reg - DWARF register
 292  *      @flags: Describes how to calculate the value of this register
 293  */
 294 struct dwarf_reg {
 295         unsigned long addr;
 296         unsigned long flags;
 297 #define DWARF_REG_OFFSET        (1 << 0)
 298 };
 299
 300 /**
 301  *      dwarf_stack - a DWARF stack contains a collection of DWARF frames
 302  *      @depth: the number of frames in the stack
 303  *      @level: an array of DWARF frames, indexed by stack level
 304  *
 305  */
 306 struct dwarf_stack {
 307         unsigned int depth;
 308         struct dwarf_frame **level;
 309 };
 310
 311 /*
 312  * Call Frame instruction opcodes.
 313  */
 314 #define DW_CFA_advance_loc      0x40
 315 #define DW_CFA_offset           0x80
 316 #define DW_CFA_restore          0xc0
 317 #define DW_CFA_nop              0x00
 318 #define DW_CFA_set_loc          0x01
 319 #define DW_CFA_advance_loc1     0x02
 320 #define DW_CFA_advance_loc2     0x03
 321 #define DW_CFA_advance_loc4     0x04
 322 #define DW_CFA_offset_extended  0x05
 323 #define DW_CFA_restore_extended 0x06
 324 #define DW_CFA_undefined        0x07
 325 #define DW_CFA_same_value       0x08
 326 #define DW_CFA_register         0x09
 327 #define DW_CFA_remember_state   0x0a
 328 #define DW_CFA_restore_state    0x0b
 329 #define DW_CFA_def_cfa          0x0c
 330 #define DW_CFA_def_cfa_register 0x0d
 331 #define DW_CFA_def_cfa_offset   0x0e
 332 #define DW_CFA_def_cfa_expression       0x0f
 333 #define DW_CFA_expression       0x10
 334 #define DW_CFA_offset_extended_sf       0x11
 335 #define DW_CFA_def_cfa_sf       0x12
 336 #define DW_CFA_def_cfa_offset_sf        0x13
 337 #define DW_CFA_val_offset       0x14
 338 #define DW_CFA_val_offset_sf    0x15
 339 #define DW_CFA_val_expression   0x16
 340 #define DW_CFA_lo_user          0x1c
 341 #define DW_CFA_hi_user          0x3f
 342
 343 /*
 344  * Some call frame instructions encode their operands in the opcode. We
 345  * need some helper functions to extract both the opcode and operands
 346  * from an instruction.
 347  */
 348 static inline unsigned int DW_CFA_opcode(unsigned long insn)
 349 {
 350         return (insn & 0xc0);
 351 }
 352
 353 static inline unsigned int DW_CFA_operand(unsigned long insn)
 354 {
 355         return (insn & 0x3f);
 356 }
 357
 358 #define DW_EH_FRAME_CIE 0               /* .eh_frame CIE IDs are 0 */
 359 #define DW_CIE_ID       0xffffffff
 360 #define DW64_CIE_ID     0xffffffffffffffffULL
 361
 362 /*
 363  * DWARF FDE/CIE length field values.
 364  */
 365 #define DW_EXT_LO       0xfffffff0
 366 #define DW_EXT_HI       0xffffffff
 367 #define DW_EXT_DWARF64  DW_EXT_HI
 368
 369 extern void dwarf_unwinder_init(void);
 370
 371 extern struct dwarf_frame *dwarf_unwind_stack(unsigned long,
 372                                               struct dwarf_frame *);
 373 #endif /* __ASSEMBLY__ */
 374
 375 #define CFI_STARTPROC   .cfi_startproc
 376 #define CFI_ENDPROC     .cfi_endproc
 377 #define CFI_DEF_CFA     .cfi_def_cfa
 378 #define CFI_REGISTER    .cfi_register
 379 #define CFI_REL_OFFSET  .cfi_rel_offset
 380
 381 #else
 382
 383 /*
 384  * Use the asm comment character to ignore the rest of the line.
 385  */
 386 #define CFI_IGNORE      !
 387
 388 #define CFI_STARTPROC   CFI_IGNORE
 389 #define CFI_ENDPROC     CFI_IGNORE
 390 #define CFI_DEF_CFA     CFI_IGNORE
 391 #define CFI_REGISTER    CFI_IGNORE
 392 #define CFI_REL_OFFSET  CFI_IGNORE
 393
 394 #ifndef __ASSEMBLY__
 395 static inline void dwarf_unwinder_init(void)
 396 {
 397 }
 398 #endif
 399
 400 #endif /* CONFIG_DWARF_UNWINDER */
 401
 402 #endif /* __ASM_SH_DWARF_H */