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 */ 201static __always_inline unsigned long dwarf_read_arch_reg(unsigned int reg) 202{ 203 unsigned long value = 0; 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 */ 222struct 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 */ 249struct 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 */ 263struct dwarf_frame { 264 struct dwarf_frame *prev, *next; 265 266 unsigned long pc; 267 268 struct list_head reg_list; 269 270 unsigned long cfa; 271 272 /* Valid when DW_FRAME_CFA_REG_OFFSET is set in flags */ 273 unsigned int cfa_register; 274 unsigned int cfa_offset; 275 276 /* Valid when DW_FRAME_CFA_REG_EXP is set in flags */ 277 unsigned char *cfa_expr; 278 unsigned int cfa_expr_len; 279 280 unsigned long flags; 281#define DWARF_FRAME_CFA_REG_OFFSET (1 << 0) 282#define DWARF_FRAME_CFA_REG_EXP (1 << 1) 283 284 unsigned long return_addr; 285}; 286 287/** 288 * dwarf_reg - DWARF register 289 * @flags: Describes how to calculate the value of this register 290 */ 291struct dwarf_reg { 292 struct list_head link; 293 294 unsigned int number; 295 296 unsigned long addr; 297 unsigned long flags; 298#define DWARF_REG_OFFSET (1 << 0) 299#define DWARF_VAL_OFFSET (1 << 1) 300#define DWARF_UNDEFINED (1 << 2) 301}; 302 303/* 304 * Call Frame instruction opcodes. 305 */ 306#define DW_CFA_advance_loc 0x40 307#define DW_CFA_offset 0x80 308#define DW_CFA_restore 0xc0 309#define DW_CFA_nop 0x00 310#define DW_CFA_set_loc 0x01 311#define DW_CFA_advance_loc1 0x02 312#define DW_CFA_advance_loc2 0x03 313#define DW_CFA_advance_loc4 0x04 314#define DW_CFA_offset_extended 0x05 315#define DW_CFA_restore_extended 0x06 316#define DW_CFA_undefined 0x07 317#define DW_CFA_same_value 0x08 318#define DW_CFA_register 0x09 319#define DW_CFA_remember_state 0x0a 320#define DW_CFA_restore_state 0x0b 321#define DW_CFA_def_cfa 0x0c 322#define DW_CFA_def_cfa_register 0x0d 323#define DW_CFA_def_cfa_offset 0x0e 324#define DW_CFA_def_cfa_expression 0x0f 325#define DW_CFA_expression 0x10 326#define DW_CFA_offset_extended_sf 0x11 327#define DW_CFA_def_cfa_sf 0x12 328#define DW_CFA_def_cfa_offset_sf 0x13 329#define DW_CFA_val_offset 0x14 330#define DW_CFA_val_offset_sf 0x15 331#define DW_CFA_val_expression 0x16 332#define DW_CFA_lo_user 0x1c 333#define DW_CFA_hi_user 0x3f 334 335/* GNU extension opcodes */ 336#define DW_CFA_GNU_args_size 0x2e 337#define DW_CFA_GNU_negative_offset_extended 0x2f 338 339/* 340 * Some call frame instructions encode their operands in the opcode. We 341 * need some helper functions to extract both the opcode and operands 342 * from an instruction. 343 */ 344static inline unsigned int DW_CFA_opcode(unsigned long insn) 345{ 346 return (insn & 0xc0); 347} 348 349static inline unsigned int DW_CFA_operand(unsigned long insn) 350{ 351 return (insn & 0x3f); 352} 353 354#define DW_EH_FRAME_CIE 0 /* .eh_frame CIE IDs are 0 */ 355#define DW_CIE_ID 0xffffffff 356#define DW64_CIE_ID 0xffffffffffffffffULL 357 358/* 359 * DWARF FDE/CIE length field values. 360 */ 361#define DW_EXT_LO 0xfffffff0 362#define DW_EXT_HI 0xffffffff 363#define DW_EXT_DWARF64 DW_EXT_HI 364 365extern struct dwarf_frame *dwarf_unwind_stack(unsigned long, 366 struct dwarf_frame *); 367#endif /* !__ASSEMBLY__ */ 368 369#define CFI_STARTPROC .cfi_startproc 370#define CFI_ENDPROC .cfi_endproc 371#define CFI_DEF_CFA .cfi_def_cfa 372#define CFI_REGISTER .cfi_register 373#define CFI_REL_OFFSET .cfi_rel_offset 374#define CFI_UNDEFINED .cfi_undefined 375 376#else 377 378/* 379 * Use the asm comment character to ignore the rest of the line. 380 */ 381#define CFI_IGNORE ! 382 383#define CFI_STARTPROC CFI_IGNORE 384#define CFI_ENDPROC CFI_IGNORE 385#define CFI_DEF_CFA CFI_IGNORE 386#define CFI_REGISTER CFI_IGNORE 387#define CFI_REL_OFFSET CFI_IGNORE 388#define CFI_UNDEFINED CFI_IGNORE 389 390#ifndef __ASSEMBLY__ 391static inline void dwarf_unwinder_init(void) 392{ 393} 394#endif 395 396#endif /* CONFIG_DWARF_UNWINDER */ 397 398#endif /* __ASM_SH_DWARF_H */ 399