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 */ 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 */ 224struct 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 */ 254struct 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 */ 272struct 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 */ 300struct 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 */ 353static inline unsigned int DW_CFA_opcode(unsigned long insn) 354{ 355 return (insn & 0xc0); 356} 357 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 374extern struct dwarf_frame *dwarf_unwind_stack(unsigned long, 375 struct dwarf_frame *); 376extern void dwarf_free_frame(struct dwarf_frame *); 377 378extern int module_dwarf_finalize(const Elf_Ehdr *, const Elf_Shdr *, 379 struct module *); 380extern 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__ 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