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 #include <linux/compiler.h> 199 #include <linux/bug.h> 200 #include <linux/list.h> 201 #include <linux/module.h> 202 203 /* 204 * Read either the frame pointer (r14) or the stack pointer (r15). 205 * NOTE: this MUST be inlined. 206 */ dwarf_read_arch_reg(unsigned int reg)207 static __always_inline unsigned long dwarf_read_arch_reg(unsigned int reg) 208 { 209 unsigned long value = 0; 210 211 switch (reg) { 212 case 14: 213 __asm__ __volatile__("mov r14, %0\n" : "=r" (value)); 214 break; 215 case 15: 216 __asm__ __volatile__("mov r15, %0\n" : "=r" (value)); 217 break; 218 default: 219 BUG(); 220 } 221 222 return value; 223 } 224 225 /** 226 * dwarf_cie - Common Information Entry 227 */ 228 struct dwarf_cie { 229 unsigned long length; 230 unsigned long cie_id; 231 unsigned char version; 232 const char *augmentation; 233 unsigned int code_alignment_factor; 234 int data_alignment_factor; 235 236 /* Which column in the rule table represents return addr of func. */ 237 unsigned int return_address_reg; 238 239 unsigned char *initial_instructions; 240 unsigned char *instructions_end; 241 242 unsigned char encoding; 243 244 unsigned long cie_pointer; 245 246 unsigned long flags; 247 #define DWARF_CIE_Z_AUGMENTATION (1 << 0) 248 249 /* linked-list entry if this CIE is from a module */ 250 struct list_head link; 251 252 struct rb_node node; 253 }; 254 255 /** 256 * dwarf_fde - Frame Description Entry 257 */ 258 struct dwarf_fde { 259 unsigned long length; 260 unsigned long cie_pointer; 261 struct dwarf_cie *cie; 262 unsigned long initial_location; 263 unsigned long address_range; 264 unsigned char *instructions; 265 unsigned char *end; 266 267 /* linked-list entry if this FDE is from a module */ 268 struct list_head link; 269 270 struct rb_node node; 271 }; 272 273 /** 274 * dwarf_frame - DWARF information for a frame in the call stack 275 */ 276 struct dwarf_frame { 277 struct dwarf_frame *prev, *next; 278 279 unsigned long pc; 280 281 struct list_head reg_list; 282 283 unsigned long cfa; 284 285 /* Valid when DW_FRAME_CFA_REG_OFFSET is set in flags */ 286 unsigned int cfa_register; 287 unsigned int cfa_offset; 288 289 /* Valid when DW_FRAME_CFA_REG_EXP is set in flags */ 290 unsigned char *cfa_expr; 291 unsigned int cfa_expr_len; 292 293 unsigned long flags; 294 #define DWARF_FRAME_CFA_REG_OFFSET (1 << 0) 295 #define DWARF_FRAME_CFA_REG_EXP (1 << 1) 296 297 unsigned long return_addr; 298 }; 299 300 /** 301 * dwarf_reg - DWARF register 302 * @flags: Describes how to calculate the value of this register 303 */ 304 struct dwarf_reg { 305 struct list_head link; 306 307 unsigned int number; 308 309 unsigned long addr; 310 unsigned long flags; 311 #define DWARF_REG_OFFSET (1 << 0) 312 #define DWARF_VAL_OFFSET (1 << 1) 313 #define DWARF_UNDEFINED (1 << 2) 314 }; 315 316 /* 317 * Call Frame instruction opcodes. 318 */ 319 #define DW_CFA_advance_loc 0x40 320 #define DW_CFA_offset 0x80 321 #define DW_CFA_restore 0xc0 322 #define DW_CFA_nop 0x00 323 #define DW_CFA_set_loc 0x01 324 #define DW_CFA_advance_loc1 0x02 325 #define DW_CFA_advance_loc2 0x03 326 #define DW_CFA_advance_loc4 0x04 327 #define DW_CFA_offset_extended 0x05 328 #define DW_CFA_restore_extended 0x06 329 #define DW_CFA_undefined 0x07 330 #define DW_CFA_same_value 0x08 331 #define DW_CFA_register 0x09 332 #define DW_CFA_remember_state 0x0a 333 #define DW_CFA_restore_state 0x0b 334 #define DW_CFA_def_cfa 0x0c 335 #define DW_CFA_def_cfa_register 0x0d 336 #define DW_CFA_def_cfa_offset 0x0e 337 #define DW_CFA_def_cfa_expression 0x0f 338 #define DW_CFA_expression 0x10 339 #define DW_CFA_offset_extended_sf 0x11 340 #define DW_CFA_def_cfa_sf 0x12 341 #define DW_CFA_def_cfa_offset_sf 0x13 342 #define DW_CFA_val_offset 0x14 343 #define DW_CFA_val_offset_sf 0x15 344 #define DW_CFA_val_expression 0x16 345 #define DW_CFA_lo_user 0x1c 346 #define DW_CFA_hi_user 0x3f 347 348 /* GNU extension opcodes */ 349 #define DW_CFA_GNU_args_size 0x2e 350 #define DW_CFA_GNU_negative_offset_extended 0x2f 351 352 /* 353 * Some call frame instructions encode their operands in the opcode. We 354 * need some helper functions to extract both the opcode and operands 355 * from an instruction. 356 */ DW_CFA_opcode(unsigned long insn)357 static inline unsigned int DW_CFA_opcode(unsigned long insn) 358 { 359 return (insn & 0xc0); 360 } 361 DW_CFA_operand(unsigned long insn)362 static inline unsigned int DW_CFA_operand(unsigned long insn) 363 { 364 return (insn & 0x3f); 365 } 366 367 #define DW_EH_FRAME_CIE 0 /* .eh_frame CIE IDs are 0 */ 368 #define DW_CIE_ID 0xffffffff 369 #define DW64_CIE_ID 0xffffffffffffffffULL 370 371 /* 372 * DWARF FDE/CIE length field values. 373 */ 374 #define DW_EXT_LO 0xfffffff0 375 #define DW_EXT_HI 0xffffffff 376 #define DW_EXT_DWARF64 DW_EXT_HI 377 378 extern struct dwarf_frame *dwarf_unwind_stack(unsigned long, 379 struct dwarf_frame *); 380 extern void dwarf_free_frame(struct dwarf_frame *); 381 382 extern int module_dwarf_finalize(const Elf_Ehdr *, const Elf_Shdr *, 383 struct module *); 384 extern void module_dwarf_cleanup(struct module *); 385 386 #endif /* !__ASSEMBLY__ */ 387 388 #define CFI_STARTPROC .cfi_startproc 389 #define CFI_ENDPROC .cfi_endproc 390 #define CFI_DEF_CFA .cfi_def_cfa 391 #define CFI_REGISTER .cfi_register 392 #define CFI_REL_OFFSET .cfi_rel_offset 393 #define CFI_UNDEFINED .cfi_undefined 394 395 #else 396 397 /* 398 * Use the asm comment character to ignore the rest of the line. 399 */ 400 #define CFI_IGNORE ! 401 402 #define CFI_STARTPROC CFI_IGNORE 403 #define CFI_ENDPROC CFI_IGNORE 404 #define CFI_DEF_CFA CFI_IGNORE 405 #define CFI_REGISTER CFI_IGNORE 406 #define CFI_REL_OFFSET CFI_IGNORE 407 #define CFI_UNDEFINED CFI_IGNORE 408 409 #ifndef __ASSEMBLY__ dwarf_unwinder_init(void)410 static inline void dwarf_unwinder_init(void) 411 { 412 } 413 414 #define module_dwarf_finalize(hdr, sechdrs, me) (0) 415 #define module_dwarf_cleanup(mod) do { } while (0) 416 417 #endif 418 419 #endif /* CONFIG_DWARF_UNWINDER */ 420 421 #endif /* __ASM_SH_DWARF_H */ 422