arch/sh/include/asm/dwarf.h

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * Copyright (C) 2009 Matt Fleming <matt@console-pimps.org>
   4  */
   5 #ifndef __ASM_SH_DWARF_H
   6 #define __ASM_SH_DWARF_H
   7
   8 #ifdef CONFIG_DWARF_UNWINDER
   9
  10 /*
  11  * DWARF expression operations
  12  */
  13 #define DW_OP_addr      0x03
  14 #define DW_OP_deref     0x06
  15 #define DW_OP_const1u   0x08
  16 #define DW_OP_const1s   0x09
  17 #define DW_OP_const2u   0x0a
  18 #define DW_OP_const2s   0x0b
  19 #define DW_OP_const4u   0x0c
  20 #define DW_OP_const4s   0x0d
  21 #define DW_OP_const8u   0x0e
  22 #define DW_OP_const8s   0x0f
  23 #define DW_OP_constu    0x10
  24 #define DW_OP_consts    0x11
  25 #define DW_OP_dup       0x12
  26 #define DW_OP_drop      0x13
  27 #define DW_OP_over      0x14
  28 #define DW_OP_pick      0x15
  29 #define DW_OP_swap      0x16
  30 #define DW_OP_rot       0x17
  31 #define DW_OP_xderef    0x18
  32 #define DW_OP_abs       0x19
  33 #define DW_OP_and       0x1a
  34 #define DW_OP_div       0x1b
  35 #define DW_OP_minus     0x1c
  36 #define DW_OP_mod       0x1d
  37 #define DW_OP_mul       0x1e
  38 #define DW_OP_neg       0x1f
  39 #define DW_OP_not       0x20
  40 #define DW_OP_or        0x21
  41 #define DW_OP_plus      0x22
  42 #define DW_OP_plus_uconst       0x23
  43 #define DW_OP_shl       0x24
  44 #define DW_OP_shr       0x25
  45 #define DW_OP_shra      0x26
  46 #define DW_OP_xor       0x27
  47 #define DW_OP_skip      0x2f
  48 #define DW_OP_bra       0x28
  49 #define DW_OP_eq        0x29
  50 #define DW_OP_ge        0x2a
  51 #define DW_OP_gt        0x2b
  52 #define DW_OP_le        0x2c
  53 #define DW_OP_lt        0x2d
  54 #define DW_OP_ne        0x2e
  55 #define DW_OP_lit0      0x30
  56 #define DW_OP_lit1      0x31
  57 #define DW_OP_lit2      0x32
  58 #define DW_OP_lit3      0x33
  59 #define DW_OP_lit4      0x34
  60 #define DW_OP_lit5      0x35
  61 #define DW_OP_lit6      0x36
  62 #define DW_OP_lit7      0x37
  63 #define DW_OP_lit8      0x38
  64 #define DW_OP_lit9      0x39
  65 #define DW_OP_lit10     0x3a
  66 #define DW_OP_lit11     0x3b
  67 #define DW_OP_lit12     0x3c
  68 #define DW_OP_lit13     0x3d
  69 #define DW_OP_lit14     0x3e
  70 #define DW_OP_lit15     0x3f
  71 #define DW_OP_lit16     0x40
  72 #define DW_OP_lit17     0x41
  73 #define DW_OP_lit18     0x42
  74 #define DW_OP_lit19     0x43
  75 #define DW_OP_lit20     0x44
  76 #define DW_OP_lit21     0x45
  77 #define DW_OP_lit22     0x46
  78 #define DW_OP_lit23     0x47
  79 #define DW_OP_lit24     0x48
  80 #define DW_OP_lit25     0x49
  81 #define DW_OP_lit26     0x4a
  82 #define DW_OP_lit27     0x4b
  83 #define DW_OP_lit28     0x4c
  84 #define DW_OP_lit29     0x4d
  85 #define DW_OP_lit30     0x4e
  86 #define DW_OP_lit31     0x4f
  87 #define DW_OP_reg0      0x50
  88 #define DW_OP_reg1      0x51
  89 #define DW_OP_reg2      0x52
  90 #define DW_OP_reg3      0x53
  91 #define DW_OP_reg4      0x54
  92 #define DW_OP_reg5      0x55
  93 #define DW_OP_reg6      0x56
  94 #define DW_OP_reg7      0x57
  95 #define DW_OP_reg8      0x58
  96 #define DW_OP_reg9      0x59
  97 #define DW_OP_reg10     0x5a
  98 #define DW_OP_reg11     0x5b
  99 #define DW_OP_reg12     0x5c
 100 #define DW_OP_reg13     0x5d
 101 #define DW_OP_reg14     0x5e
 102 #define DW_OP_reg15     0x5f
 103 #define DW_OP_reg16     0x60
 104 #define DW_OP_reg17     0x61
 105 #define DW_OP_reg18     0x62
 106 #define DW_OP_reg19     0x63
 107 #define DW_OP_reg20     0x64
 108 #define DW_OP_reg21     0x65
 109 #define DW_OP_reg22     0x66
 110 #define DW_OP_reg23     0x67
 111 #define DW_OP_reg24     0x68
 112 #define DW_OP_reg25     0x69
 113 #define DW_OP_reg26     0x6a
 114 #define DW_OP_reg27     0x6b
 115 #define DW_OP_reg28     0x6c
 116 #define DW_OP_reg29     0x6d
 117 #define DW_OP_reg30     0x6e
 118 #define DW_OP_reg31     0x6f
 119 #define DW_OP_breg0     0x70
 120 #define DW_OP_breg1     0x71
 121 #define DW_OP_breg2     0x72
 122 #define DW_OP_breg3     0x73
 123 #define DW_OP_breg4     0x74
 124 #define DW_OP_breg5     0x75
 125 #define DW_OP_breg6     0x76
 126 #define DW_OP_breg7     0x77
 127 #define DW_OP_breg8     0x78
 128 #define DW_OP_breg9     0x79
 129 #define DW_OP_breg10    0x7a
 130 #define DW_OP_breg11    0x7b
 131 #define DW_OP_breg12    0x7c
 132 #define DW_OP_breg13    0x7d
 133 #define DW_OP_breg14    0x7e
 134 #define DW_OP_breg15    0x7f
 135 #define DW_OP_breg16    0x80
 136 #define DW_OP_breg17    0x81
 137 #define DW_OP_breg18    0x82
 138 #define DW_OP_breg19    0x83
 139 #define DW_OP_breg20    0x84
 140 #define DW_OP_breg21    0x85
 141 #define DW_OP_breg22    0x86
 142 #define DW_OP_breg23    0x87
 143 #define DW_OP_breg24    0x88
 144 #define DW_OP_breg25    0x89
 145 #define DW_OP_breg26    0x8a
 146 #define DW_OP_breg27    0x8b
 147 #define DW_OP_breg28    0x8c
 148 #define DW_OP_breg29    0x8d
 149 #define DW_OP_breg30    0x8e
 150 #define DW_OP_breg31    0x8f
 151 #define DW_OP_regx      0x90
 152 #define DW_OP_fbreg     0x91
 153 #define DW_OP_bregx     0x92
 154 #define DW_OP_piece     0x93
 155 #define DW_OP_deref_size        0x94
 156 #define DW_OP_xderef_size       0x95
 157 #define DW_OP_nop       0x96
 158 #define DW_OP_push_object_address       0x97
 159 #define DW_OP_call2     0x98
 160 #define DW_OP_call4     0x99
 161 #define DW_OP_call_ref  0x9a
 162 #define DW_OP_form_tls_address  0x9b
 163 #define DW_OP_call_frame_cfa    0x9c
 164 #define DW_OP_bit_piece 0x9d
 165 #define DW_OP_lo_user   0xe0
 166 #define DW_OP_hi_user   0xff
 167
 168 /*
 169  * Addresses used in FDE entries in the .eh_frame section may be encoded
 170  * using one of the following encodings.
 171  */
 172 #define DW_EH_PE_absptr 0x00
 173 #define DW_EH_PE_omit   0xff
 174 #define DW_EH_PE_uleb128        0x01
 175 #define DW_EH_PE_udata2 0x02
 176 #define DW_EH_PE_udata4 0x03
 177 #define DW_EH_PE_udata8 0x04
 178 #define DW_EH_PE_sleb128        0x09
 179 #define DW_EH_PE_sdata2 0x0a
 180 #define DW_EH_PE_sdata4 0x0b
 181 #define DW_EH_PE_sdata8 0x0c
 182 #define DW_EH_PE_signed 0x09
 183
 184 #define DW_EH_PE_pcrel  0x10
 185
 186 /*
 187  * The architecture-specific register number that contains the return
 188  * address in the .debug_frame table.
 189  */
 190 #define DWARF_ARCH_RA_REG       17
 191
 192 #ifndef __ASSEMBLY__
 193
 194 #include <linux/compiler.h>
 195 #include <linux/bug.h>
 196 #include <linux/list.h>
 197 #include <linux/module.h>
 198
 199 /*
 200  * Read either the frame pointer (r14) or the stack pointer (r15).
 201  * NOTE: this MUST be inlined.
 202  */
 203 static __always_inline unsigned long dwarf_read_arch_reg(unsigned int reg)
 204 {
 205         unsigned long value = 0;
 206
 207         switch (reg) {
 208         case 14:
 209                 __asm__ __volatile__("mov r14, %0\n" : "=r" (value));
 210                 break;
 211         case 15:
 212                 __asm__ __volatile__("mov r15, %0\n" : "=r" (value));
 213                 break;
 214         default:
 215                 BUG();
 216         }
 217
 218         return value;
 219 }
 220
 221 /**
 222  *      dwarf_cie - Common Information Entry
 223  */
 224 struct dwarf_cie {
 225         unsigned long length;
 226         unsigned long cie_id;
 227         unsigned char version;
 228         const char *augmentation;
 229         unsigned int code_alignment_factor;
 230         int data_alignment_factor;
 231
 232         /* Which column in the rule table represents return addr of func. */
 233         unsigned int return_address_reg;
 234
 235         unsigned char *initial_instructions;
 236         unsigned char *instructions_end;
 237
 238         unsigned char encoding;
 239
 240         unsigned long cie_pointer;
 241
 242         unsigned long flags;
 243 #define DWARF_CIE_Z_AUGMENTATION        (1 << 0)
 244
 245         /* linked-list entry if this CIE is from a module */
 246         struct list_head link;
 247
 248         struct rb_node node;
 249 };
 250
 251 /**
 252  *      dwarf_fde - Frame Description Entry
 253  */
 254 struct dwarf_fde {
 255         unsigned long length;
 256         unsigned long cie_pointer;
 257         struct dwarf_cie *cie;
 258         unsigned long initial_location;
 259         unsigned long address_range;
 260         unsigned char *instructions;
 261         unsigned char *end;
 262
 263         /* linked-list entry if this FDE is from a module */
 264         struct list_head link;
 265
 266         struct rb_node node;
 267 };
 268
 269 /**
 270  *      dwarf_frame - DWARF information for a frame in the call stack
 271  */
 272 struct dwarf_frame {
 273         struct dwarf_frame *prev, *next;
 274
 275         unsigned long pc;
 276
 277         struct list_head reg_list;
 278
 279         unsigned long cfa;
 280
 281         /* Valid when DW_FRAME_CFA_REG_OFFSET is set in flags */
 282         unsigned int cfa_register;
 283         unsigned int cfa_offset;
 284
 285         /* Valid when DW_FRAME_CFA_REG_EXP is set in flags */
 286         unsigned char *cfa_expr;
 287         unsigned int cfa_expr_len;
 288
 289         unsigned long flags;
 290 #define DWARF_FRAME_CFA_REG_OFFSET      (1 << 0)
 291 #define DWARF_FRAME_CFA_REG_EXP         (1 << 1)
 292
 293         unsigned long return_addr;
 294 };
 295
 296 /**
 297  *      dwarf_reg - DWARF register
 298  *      @flags: Describes how to calculate the value of this register
 299  */
 300 struct dwarf_reg {
 301         struct list_head link;
 302
 303         unsigned int number;
 304
 305         unsigned long addr;
 306         unsigned long flags;
 307 #define DWARF_REG_OFFSET        (1 << 0)
 308 #define DWARF_VAL_OFFSET        (1 << 1)
 309 #define DWARF_UNDEFINED         (1 << 2)
 310 };
 311
 312 /*
 313  * Call Frame instruction opcodes.
 314  */
 315 #define DW_CFA_advance_loc      0x40
 316 #define DW_CFA_offset           0x80
 317 #define DW_CFA_restore          0xc0
 318 #define DW_CFA_nop              0x00
 319 #define DW_CFA_set_loc          0x01
 320 #define DW_CFA_advance_loc1     0x02
 321 #define DW_CFA_advance_loc2     0x03
 322 #define DW_CFA_advance_loc4     0x04
 323 #define DW_CFA_offset_extended  0x05
 324 #define DW_CFA_restore_extended 0x06
 325 #define DW_CFA_undefined        0x07
 326 #define DW_CFA_same_value       0x08
 327 #define DW_CFA_register         0x09
 328 #define DW_CFA_remember_state   0x0a
 329 #define DW_CFA_restore_state    0x0b
 330 #define DW_CFA_def_cfa          0x0c
 331 #define DW_CFA_def_cfa_register 0x0d
 332 #define DW_CFA_def_cfa_offset   0x0e
 333 #define DW_CFA_def_cfa_expression       0x0f
 334 #define DW_CFA_expression       0x10
 335 #define DW_CFA_offset_extended_sf       0x11
 336 #define DW_CFA_def_cfa_sf       0x12
 337 #define DW_CFA_def_cfa_offset_sf        0x13
 338 #define DW_CFA_val_offset       0x14
 339 #define DW_CFA_val_offset_sf    0x15
 340 #define DW_CFA_val_expression   0x16
 341 #define DW_CFA_lo_user          0x1c
 342 #define DW_CFA_hi_user          0x3f
 343
 344 /* GNU extension opcodes  */
 345 #define DW_CFA_GNU_args_size    0x2e
 346 #define DW_CFA_GNU_negative_offset_extended 0x2f
 347
 348 /*
 349  * Some call frame instructions encode their operands in the opcode. We
 350  * need some helper functions to extract both the opcode and operands
 351  * from an instruction.
 352  */
 353 static inline unsigned int DW_CFA_opcode(unsigned long insn)
 354 {
 355         return (insn & 0xc0);
 356 }
 357
 358 static inline unsigned int DW_CFA_operand(unsigned long insn)
 359 {
 360         return (insn & 0x3f);
 361 }
 362
 363 #define DW_EH_FRAME_CIE 0               /* .eh_frame CIE IDs are 0 */
 364 #define DW_CIE_ID       0xffffffff
 365 #define DW64_CIE_ID     0xffffffffffffffffULL
 366
 367 /*
 368  * DWARF FDE/CIE length field values.
 369  */
 370 #define DW_EXT_LO       0xfffffff0
 371 #define DW_EXT_HI       0xffffffff
 372 #define DW_EXT_DWARF64  DW_EXT_HI
 373
 374 extern struct dwarf_frame *dwarf_unwind_stack(unsigned long,
 375                                               struct dwarf_frame *);
 376 extern void dwarf_free_frame(struct dwarf_frame *);
 377
 378 extern int module_dwarf_finalize(const Elf_Ehdr *, const Elf_Shdr *,
 379                                  struct module *);
 380 extern void module_dwarf_cleanup(struct module *);
 381
 382 #endif /* !__ASSEMBLY__ */
 383
 384 #define CFI_STARTPROC   .cfi_startproc
 385 #define CFI_ENDPROC     .cfi_endproc
 386 #define CFI_DEF_CFA     .cfi_def_cfa
 387 #define CFI_REGISTER    .cfi_register
 388 #define CFI_REL_OFFSET  .cfi_rel_offset
 389 #define CFI_UNDEFINED   .cfi_undefined
 390
 391 #else
 392
 393 /*
 394  * Use the asm comment character to ignore the rest of the line.
 395  */
 396 #define CFI_IGNORE      !
 397
 398 #define CFI_STARTPROC   CFI_IGNORE
 399 #define CFI_ENDPROC     CFI_IGNORE
 400 #define CFI_DEF_CFA     CFI_IGNORE
 401 #define CFI_REGISTER    CFI_IGNORE
 402 #define CFI_REL_OFFSET  CFI_IGNORE
 403 #define CFI_UNDEFINED   CFI_IGNORE
 404
 405 #ifndef __ASSEMBLY__
 406 static inline void dwarf_unwinder_init(void)
 407 {
 408 }
 409
 410 #define module_dwarf_finalize(hdr, sechdrs, me) (0)
 411 #define module_dwarf_cleanup(mod)               do { } while (0)
 412
 413 #endif
 414
 415 #endif /* CONFIG_DWARF_UNWINDER */
 416
 417 #endif /* __ASM_SH_DWARF_H */