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 */ 207static __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 */ 228struct 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 */ 258struct 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 */ 276struct 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 */ 304struct 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 */ 357static inline unsigned int DW_CFA_opcode(unsigned long insn) 358{ 359 return (insn & 0xc0); 360} 361 362static 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 378extern struct dwarf_frame *dwarf_unwind_stack(unsigned long, 379 struct dwarf_frame *); 380extern void dwarf_free_frame(struct dwarf_frame *); 381 382extern int module_dwarf_finalize(const Elf_Ehdr *, const Elf_Shdr *, 383 struct module *); 384extern 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__ 410static 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