cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dwarf.h (9896B)


      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 */