git://sourceware.org / systemtap.git / blame
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| 949e84da FCE |
1 | /* -*- linux-c -*- |
| 2 | * | |
| 3 | * dwarf unwinder header file | |
| 4285dc9a | 4 | * Copyright (C) 2008, 2009 Red Hat Inc. |
| 949e84da FCE |
5 | * Copyright (C) 2002-2006 Novell, Inc. |
| 6 | * | |
| 7 | * This file is part of systemtap, and is free software. You can | |
| 8 | * redistribute it and/or modify it under the terms of the GNU General | |
| 9 | * Public License (GPL); either version 2, or (at your option) any | |
| 10 | * later version. | |
| 11 | */ | |
| 12 | ||
| 13 | #ifndef _STP_UNWIND_H_ | |
| 14 | #define _STP_UNWIND_H_ | |
| 15 | ||
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16 | #ifdef STP_USE_DWARF_UNWINDER |
| 17 | ||
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18 | #if defined (__x86_64__) |
| 19 | #include "x86_64.h" | |
| 20 | #elif defined (__i386__) | |
| 21 | #include "i386.h" | |
| 22 | #else | |
| 23 | #error "Unsupported dwarf unwind architecture" | |
| 24 | #endif | |
| 25 | ||
| 9afe68ed | 26 | #define STP_MAX_STACK_DEPTH 8 |
| 949e84da | 27 | |
| f1743f00 FCE |
28 | #ifndef BUILD_BUG_ON_ZERO |
| 29 | #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1) | |
| 30 | #endif | |
| 31 | ||
| 32 | ||
| 949e84da FCE |
33 | #define EXTRA_INFO(f) { \ |
| 34 | BUILD_BUG_ON_ZERO(offsetof(struct unwind_frame_info, f) \ | |
| 35 | % FIELD_SIZEOF(struct unwind_frame_info, f)) \ | |
| 36 | + offsetof(struct unwind_frame_info, f) \ | |
| 37 | / FIELD_SIZEOF(struct unwind_frame_info, f), \ | |
| 38 | FIELD_SIZEOF(struct unwind_frame_info, f) \ | |
| 39 | } | |
| 40 | #define PTREGS_INFO(f) EXTRA_INFO(regs.f) | |
| 41 | ||
| 42 | static const struct { | |
| 43 | unsigned offs:BITS_PER_LONG / 2; | |
| 44 | unsigned width:BITS_PER_LONG / 2; | |
| 45 | } reg_info[] = { | |
| 46 | UNW_REGISTER_INFO | |
| 47 | }; | |
| 48 | ||
| 49 | #undef PTREGS_INFO | |
| 50 | #undef EXTRA_INFO | |
| 51 | ||
| 52 | #ifndef REG_INVALID | |
| 53 | #define REG_INVALID(r) (reg_info[r].width == 0) | |
| 54 | #endif | |
| 55 | ||
| 56 | #define DW_CFA_nop 0x00 | |
| 57 | #define DW_CFA_set_loc 0x01 | |
| 58 | #define DW_CFA_advance_loc1 0x02 | |
| 59 | #define DW_CFA_advance_loc2 0x03 | |
| 60 | #define DW_CFA_advance_loc4 0x04 | |
| 61 | #define DW_CFA_offset_extended 0x05 | |
| 62 | #define DW_CFA_restore_extended 0x06 | |
| 63 | #define DW_CFA_undefined 0x07 | |
| 64 | #define DW_CFA_same_value 0x08 | |
| 65 | #define DW_CFA_register 0x09 | |
| 66 | #define DW_CFA_remember_state 0x0a | |
| 67 | #define DW_CFA_restore_state 0x0b | |
| 68 | #define DW_CFA_def_cfa 0x0c | |
| 69 | #define DW_CFA_def_cfa_register 0x0d | |
| 70 | #define DW_CFA_def_cfa_offset 0x0e | |
| 71 | #define DW_CFA_def_cfa_expression 0x0f | |
| 72 | #define DW_CFA_expression 0x10 | |
| 73 | #define DW_CFA_offset_extended_sf 0x11 | |
| 74 | #define DW_CFA_def_cfa_sf 0x12 | |
| 75 | #define DW_CFA_def_cfa_offset_sf 0x13 | |
| 76 | #define DW_CFA_val_offset 0x14 | |
| 77 | #define DW_CFA_val_offset_sf 0x15 | |
| 78 | #define DW_CFA_val_expression 0x16 | |
| 79 | #define DW_CFA_lo_user 0x1c | |
| 80 | #define DW_CFA_GNU_window_save 0x2d | |
| 81 | #define DW_CFA_GNU_args_size 0x2e | |
| 82 | #define DW_CFA_GNU_negative_offset_extended 0x2f | |
| 83 | #define DW_CFA_hi_user 0x3f | |
| 84 | ||
| 85 | #define DW_EH_PE_absptr 0x00 | |
| 86 | #define DW_EH_PE_leb128 0x01 | |
| 87 | #define DW_EH_PE_data2 0x02 | |
| 88 | #define DW_EH_PE_data4 0x03 | |
| 89 | #define DW_EH_PE_data8 0x04 | |
| 90 | #define DW_EH_PE_FORM 0x07 /* mask */ | |
| 91 | #define DW_EH_PE_signed 0x08 /* signed versions of above have this bit set */ | |
| 92 | ||
| 93 | #define DW_EH_PE_pcrel 0x10 | |
| 94 | #define DW_EH_PE_textrel 0x20 | |
| 95 | #define DW_EH_PE_datarel 0x30 | |
| 96 | #define DW_EH_PE_funcrel 0x40 | |
| 97 | #define DW_EH_PE_aligned 0x50 | |
| 98 | #define DW_EH_PE_ADJUST 0x70 /* mask */ | |
| 99 | #define DW_EH_PE_indirect 0x80 | |
| 100 | #define DW_EH_PE_omit 0xff | |
| 101 | ||
| 102 | typedef unsigned long uleb128_t; | |
| 103 | typedef signed long sleb128_t; | |
| 104 | ||
| 105 | static struct unwind_table { | |
| 106 | unsigned long pc; /* text */ | |
| 107 | unsigned long range; /* text_size */ | |
| 108 | const void *address; /* unwind_data */ | |
| 109 | unsigned long size; /* unwind_data_len */ | |
| 110 | const unsigned char *header; /* unwind_header */ | |
| 111 | unsigned long hdrsz; | |
| 112 | struct unwind_table *link; | |
| 113 | const char *name; /* module name */ | |
| 114 | } root_table; | |
| 115 | ||
| 116 | struct unwind_item { | |
| 117 | enum item_location { | |
| 118 | Nowhere, | |
| 119 | Memory, | |
| 120 | Register, | |
| 121 | Value | |
| 122 | } where; | |
| 123 | uleb128_t value; | |
| 124 | }; | |
| 125 | ||
| 126 | struct unwind_state { | |
| 127 | uleb128_t loc, org; | |
| 128 | const u8 *cieStart, *cieEnd; | |
| 129 | uleb128_t codeAlign; | |
| 130 | sleb128_t dataAlign; | |
| 131 | struct cfa { | |
| 132 | uleb128_t reg, offs; | |
| 133 | } cfa; | |
| 134 | struct unwind_item regs[ARRAY_SIZE(reg_info)]; | |
| 135 | unsigned stackDepth:8; | |
| 136 | unsigned version:8; | |
| 137 | const u8 *label; | |
| 9afe68ed | 138 | const u8 *stack[STP_MAX_STACK_DEPTH]; |
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139 | }; |
| 140 | ||
| 141 | static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 }; | |
| 142 | static unsigned long read_pointer(const u8 **pLoc, | |
| 143 | const void *end, | |
| 144 | signed ptrType); | |
| 145 | static const u32 bad_cie, not_fde; | |
| bf043a5f MW |
146 | static const u32 *cie_for_fde(const u32 *fde, void *table, |
| 147 | uint32_t table_len, int is_ehframe); | |
| 148 | static signed fde_pointer_type(const u32 *cie, | |
| 149 | void *table, uint32_t table_len); | |
| 949e84da | 150 | |
| ca1655b0 FCE |
151 | |
| 152 | #endif /* STP_USE_DWARF_UNWINDER */ | |
| 949e84da | 153 | #endif /*_STP_UNWIND_H_*/ |