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 */ dwarf_read_arch_reg(unsigned int reg)203static __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 */ DW_CFA_opcode(unsigned long insn)353static inline unsigned int DW_CFA_opcode(unsigned long insn) 354 { 355 return (insn & 0xc0); 356 } 357 DW_CFA_operand(unsigned long insn)358static 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__ dwarf_unwinder_init(void)406static 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 */ 418