Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 1 | //===-- DWARFCallFrameInfo.cpp ----------------------------------*- C++ -*-===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | |
| 11 | // C Includes |
| 12 | // C++ Includes |
| 13 | #include <list> |
| 14 | |
Jason Molenda | 4e12194 | 2010-10-26 12:01:35 +0000 | [diff] [blame] | 15 | #include "lldb/Core/Log.h" |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 16 | #include "lldb/Core/Section.h" |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 17 | #include "lldb/Core/ArchSpec.h" |
| 18 | #include "lldb/Core/Module.h" |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 19 | #include "lldb/Core/Section.h" |
Greg Clayton | df6dc88 | 2012-01-05 03:57:59 +0000 | [diff] [blame] | 20 | #include "lldb/Host/Host.h" |
| 21 | #include "lldb/Symbol/DWARFCallFrameInfo.h" |
| 22 | #include "lldb/Symbol/ObjectFile.h" |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 23 | #include "lldb/Symbol/UnwindPlan.h" |
Greg Clayton | df6dc88 | 2012-01-05 03:57:59 +0000 | [diff] [blame] | 24 | #include "lldb/Target/RegisterContext.h" |
| 25 | #include "lldb/Target/Thread.h" |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 26 | |
| 27 | using namespace lldb; |
| 28 | using namespace lldb_private; |
| 29 | |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 30 | DWARFCallFrameInfo::DWARFCallFrameInfo(ObjectFile& objfile, SectionSP& section_sp, lldb::RegisterKind reg_kind, bool is_eh_frame) : |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 31 | m_objfile (objfile), |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 32 | m_section_sp (section_sp), |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 33 | m_reg_kind (reg_kind), // The flavor of registers that the CFI data uses (enum RegisterKind) |
Stephen Wilson | dbeb3e1 | 2011-04-11 19:41:40 +0000 | [diff] [blame] | 34 | m_flags (), |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 35 | m_cie_map (), |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 36 | m_cfi_data (), |
| 37 | m_cfi_data_initialized (false), |
| 38 | m_fde_index (), |
| 39 | m_fde_index_initialized (false), |
Stephen Wilson | dbeb3e1 | 2011-04-11 19:41:40 +0000 | [diff] [blame] | 40 | m_is_eh_frame (is_eh_frame) |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 41 | { |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | DWARFCallFrameInfo::~DWARFCallFrameInfo() |
| 45 | { |
| 46 | } |
| 47 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 48 | |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 49 | bool |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 50 | DWARFCallFrameInfo::GetAddressRange (Address addr, AddressRange &range) |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 51 | { |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 52 | FDEEntry fde_entry; |
| 53 | if (GetFDEEntryByAddress (addr, fde_entry) == false) |
| 54 | return false; |
| 55 | range = fde_entry.bounds; |
| 56 | return true; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 57 | } |
| 58 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 59 | bool |
| 60 | DWARFCallFrameInfo::GetUnwindPlan (Address addr, UnwindPlan& unwind_plan) |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 61 | { |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 62 | FDEEntry fde_entry; |
| 63 | if (GetFDEEntryByAddress (addr, fde_entry) == false) |
| 64 | return false; |
| 65 | return FDEToUnwindPlan (fde_entry.offset, addr, unwind_plan); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 66 | } |
| 67 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 68 | bool |
| 69 | DWARFCallFrameInfo::GetFDEEntryByAddress (Address addr, FDEEntry& fde_entry) |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 70 | { |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 71 | if (m_section_sp.get() == NULL || m_section_sp->IsEncrypted()) |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 72 | return false; |
| 73 | GetFDEIndex(); |
| 74 | |
| 75 | struct FDEEntry searchfde; |
| 76 | searchfde.bounds = AddressRange (addr, 1); |
| 77 | |
| 78 | std::vector<FDEEntry>::const_iterator idx; |
| 79 | if (m_fde_index.size() == 0) |
| 80 | return false; |
| 81 | |
| 82 | idx = std::lower_bound (m_fde_index.begin(), m_fde_index.end(), searchfde); |
| 83 | if (idx == m_fde_index.end()) |
| 84 | { |
| 85 | --idx; |
| 86 | } |
Jason Molenda | db599d3 | 2011-01-25 03:12:34 +0000 | [diff] [blame] | 87 | if (idx != m_fde_index.begin() && idx->bounds.GetBaseAddress().GetOffset() != addr.GetOffset()) |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 88 | { |
| 89 | --idx; |
| 90 | } |
| 91 | if (idx->bounds.ContainsFileAddress (addr)) |
| 92 | { |
| 93 | fde_entry = *idx; |
| 94 | return true; |
| 95 | } |
| 96 | |
| 97 | return false; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 98 | } |
| 99 | |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 100 | const DWARFCallFrameInfo::CIE* |
| 101 | DWARFCallFrameInfo::GetCIE(dw_offset_t cie_offset) |
| 102 | { |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 103 | cie_map_t::iterator pos = m_cie_map.find(cie_offset); |
| 104 | |
| 105 | if (pos != m_cie_map.end()) |
| 106 | { |
| 107 | // Parse and cache the CIE |
| 108 | if (pos->second.get() == NULL) |
| 109 | pos->second = ParseCIE (cie_offset); |
| 110 | |
| 111 | return pos->second.get(); |
| 112 | } |
| 113 | return NULL; |
| 114 | } |
| 115 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 116 | DWARFCallFrameInfo::CIESP |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 117 | DWARFCallFrameInfo::ParseCIE (const dw_offset_t cie_offset) |
| 118 | { |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 119 | CIESP cie_sp(new CIE(cie_offset)); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 120 | dw_offset_t offset = cie_offset; |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 121 | if (m_cfi_data_initialized == false) |
Greg Clayton | d2909b4 | 2011-12-29 00:05:26 +0000 | [diff] [blame] | 122 | GetCFIData(); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 123 | const uint32_t length = m_cfi_data.GetU32(&offset); |
| 124 | const dw_offset_t cie_id = m_cfi_data.GetU32(&offset); |
| 125 | const dw_offset_t end_offset = cie_offset + length + 4; |
Greg Clayton | b344843 | 2011-03-24 21:19:54 +0000 | [diff] [blame] | 126 | if (length > 0 && ((!m_is_eh_frame && cie_id == 0xfffffffful) || (m_is_eh_frame && cie_id == 0ul))) |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 127 | { |
| 128 | size_t i; |
| 129 | // cie.offset = cie_offset; |
| 130 | // cie.length = length; |
| 131 | // cie.cieID = cieID; |
Jason Molenda | ccfba72 | 2010-07-06 22:38:03 +0000 | [diff] [blame] | 132 | cie_sp->ptr_encoding = DW_EH_PE_absptr; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 133 | cie_sp->version = m_cfi_data.GetU8(&offset); |
| 134 | |
| 135 | for (i=0; i<CFI_AUG_MAX_SIZE; ++i) |
| 136 | { |
| 137 | cie_sp->augmentation[i] = m_cfi_data.GetU8(&offset); |
| 138 | if (cie_sp->augmentation[i] == '\0') |
| 139 | { |
| 140 | // Zero out remaining bytes in augmentation string |
| 141 | for (size_t j = i+1; j<CFI_AUG_MAX_SIZE; ++j) |
| 142 | cie_sp->augmentation[j] = '\0'; |
| 143 | |
| 144 | break; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | if (i == CFI_AUG_MAX_SIZE && cie_sp->augmentation[CFI_AUG_MAX_SIZE-1] != '\0') |
| 149 | { |
Greg Clayton | df6dc88 | 2012-01-05 03:57:59 +0000 | [diff] [blame] | 150 | Host::SystemLog (Host::eSystemLogError, "CIE parse error: CIE augmentation string was too large for the fixed sized buffer of %d bytes.\n", CFI_AUG_MAX_SIZE); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 151 | return cie_sp; |
| 152 | } |
| 153 | cie_sp->code_align = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 154 | cie_sp->data_align = (int32_t)m_cfi_data.GetSLEB128(&offset); |
| 155 | cie_sp->return_addr_reg_num = m_cfi_data.GetU8(&offset); |
| 156 | |
| 157 | if (cie_sp->augmentation[0]) |
| 158 | { |
| 159 | // Get the length of the eh_frame augmentation data |
| 160 | // which starts with a ULEB128 length in bytes |
| 161 | const size_t aug_data_len = (size_t)m_cfi_data.GetULEB128(&offset); |
| 162 | const size_t aug_data_end = offset + aug_data_len; |
| 163 | const size_t aug_str_len = strlen(cie_sp->augmentation); |
| 164 | // A 'z' may be present as the first character of the string. |
| 165 | // If present, the Augmentation Data field shall be present. |
| 166 | // The contents of the Augmentation Data shall be intepreted |
| 167 | // according to other characters in the Augmentation String. |
| 168 | if (cie_sp->augmentation[0] == 'z') |
| 169 | { |
| 170 | // Extract the Augmentation Data |
| 171 | size_t aug_str_idx = 0; |
| 172 | for (aug_str_idx = 1; aug_str_idx < aug_str_len; aug_str_idx++) |
| 173 | { |
| 174 | char aug = cie_sp->augmentation[aug_str_idx]; |
| 175 | switch (aug) |
| 176 | { |
| 177 | case 'L': |
| 178 | // Indicates the presence of one argument in the |
| 179 | // Augmentation Data of the CIE, and a corresponding |
| 180 | // argument in the Augmentation Data of the FDE. The |
| 181 | // argument in the Augmentation Data of the CIE is |
| 182 | // 1-byte and represents the pointer encoding used |
| 183 | // for the argument in the Augmentation Data of the |
| 184 | // FDE, which is the address of a language-specific |
| 185 | // data area (LSDA). The size of the LSDA pointer is |
| 186 | // specified by the pointer encoding used. |
| 187 | m_cfi_data.GetU8(&offset); |
| 188 | break; |
| 189 | |
| 190 | case 'P': |
| 191 | // Indicates the presence of two arguments in the |
| 192 | // Augmentation Data of the cie_sp-> The first argument |
| 193 | // is 1-byte and represents the pointer encoding |
| 194 | // used for the second argument, which is the |
| 195 | // address of a personality routine handler. The |
| 196 | // size of the personality routine pointer is |
| 197 | // specified by the pointer encoding used. |
| 198 | { |
| 199 | uint8_t arg_ptr_encoding = m_cfi_data.GetU8(&offset); |
| 200 | m_cfi_data.GetGNUEHPointer(&offset, arg_ptr_encoding, LLDB_INVALID_ADDRESS, LLDB_INVALID_ADDRESS, LLDB_INVALID_ADDRESS); |
| 201 | } |
| 202 | break; |
| 203 | |
| 204 | case 'R': |
| 205 | // A 'R' may be present at any position after the |
| 206 | // first character of the string. The Augmentation |
| 207 | // Data shall include a 1 byte argument that |
| 208 | // represents the pointer encoding for the address |
| 209 | // pointers used in the FDE. |
| 210 | cie_sp->ptr_encoding = m_cfi_data.GetU8(&offset); |
| 211 | break; |
| 212 | } |
| 213 | } |
| 214 | } |
| 215 | else if (strcmp(cie_sp->augmentation, "eh") == 0) |
| 216 | { |
| 217 | // If the Augmentation string has the value "eh", then |
| 218 | // the EH Data field shall be present |
| 219 | } |
| 220 | |
| 221 | // Set the offset to be the end of the augmentation data just in case |
| 222 | // we didn't understand any of the data. |
| 223 | offset = (uint32_t)aug_data_end; |
| 224 | } |
| 225 | |
| 226 | if (end_offset > offset) |
| 227 | { |
| 228 | cie_sp->inst_offset = offset; |
| 229 | cie_sp->inst_length = end_offset - offset; |
| 230 | } |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 231 | while (offset < end_offset) |
| 232 | { |
| 233 | uint8_t inst = m_cfi_data.GetU8(&offset); |
| 234 | uint8_t primary_opcode = inst & 0xC0; |
| 235 | uint8_t extended_opcode = inst & 0x3F; |
| 236 | |
| 237 | if (extended_opcode == DW_CFA_def_cfa) |
| 238 | { |
| 239 | // Takes two unsigned LEB128 operands representing a register |
| 240 | // number and a (non-factored) offset. The required action |
| 241 | // is to define the current CFA rule to use the provided |
| 242 | // register and offset. |
| 243 | uint32_t reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 244 | int op_offset = (int32_t)m_cfi_data.GetULEB128(&offset); |
| 245 | cie_sp->initial_row.SetCFARegister (reg_num); |
| 246 | cie_sp->initial_row.SetCFAOffset (op_offset); |
| 247 | continue; |
| 248 | } |
| 249 | if (primary_opcode == DW_CFA_offset) |
| 250 | { |
| 251 | // 0x80 - high 2 bits are 0x2, lower 6 bits are register. |
| 252 | // Takes two arguments: an unsigned LEB128 constant representing a |
| 253 | // factored offset and a register number. The required action is to |
| 254 | // change the rule for the register indicated by the register number |
| 255 | // to be an offset(N) rule with a value of |
| 256 | // (N = factored offset * data_align). |
| 257 | uint32_t reg_num = extended_opcode; |
| 258 | int op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * cie_sp->data_align; |
| 259 | UnwindPlan::Row::RegisterLocation reg_location; |
| 260 | reg_location.SetAtCFAPlusOffset(op_offset); |
| 261 | cie_sp->initial_row.SetRegisterInfo (reg_num, reg_location); |
| 262 | continue; |
| 263 | } |
| 264 | if (extended_opcode == DW_CFA_nop) |
| 265 | { |
| 266 | continue; |
| 267 | } |
| 268 | break; // Stop if we hit an unrecognized opcode |
| 269 | } |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 270 | } |
| 271 | |
| 272 | return cie_sp; |
| 273 | } |
| 274 | |
Greg Clayton | d2909b4 | 2011-12-29 00:05:26 +0000 | [diff] [blame] | 275 | void |
| 276 | DWARFCallFrameInfo::GetCFIData() |
| 277 | { |
| 278 | if (m_cfi_data_initialized == false) |
| 279 | { |
| 280 | LogSP log(GetLogIfAllCategoriesSet (LIBLLDB_LOG_UNWIND)); |
| 281 | if (log) |
| 282 | m_objfile.GetModule()->LogMessage(log.get(), "Reading EH frame info"); |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 283 | m_objfile.ReadSectionData (m_section_sp.get(), m_cfi_data); |
Greg Clayton | d2909b4 | 2011-12-29 00:05:26 +0000 | [diff] [blame] | 284 | m_cfi_data_initialized = true; |
| 285 | } |
| 286 | } |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 287 | // Scan through the eh_frame or debug_frame section looking for FDEs and noting the start/end addresses |
| 288 | // of the functions and a pointer back to the function's FDE for later expansion. |
| 289 | // Internalize CIEs as we come across them. |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 290 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 291 | void |
| 292 | DWARFCallFrameInfo::GetFDEIndex () |
| 293 | { |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 294 | if (m_section_sp.get() == NULL || m_section_sp->IsEncrypted()) |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 295 | return; |
| 296 | if (m_fde_index_initialized) |
| 297 | return; |
| 298 | |
Jason Molenda | 4e12194 | 2010-10-26 12:01:35 +0000 | [diff] [blame] | 299 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 300 | dw_offset_t offset = 0; |
| 301 | if (m_cfi_data_initialized == false) |
Greg Clayton | d2909b4 | 2011-12-29 00:05:26 +0000 | [diff] [blame] | 302 | GetCFIData(); |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 303 | while (m_cfi_data.ValidOffsetForDataOfSize (offset, 8)) |
| 304 | { |
Greg Clayton | 63afdb0 | 2011-06-17 01:22:15 +0000 | [diff] [blame] | 305 | const dw_offset_t current_entry = offset; |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 306 | uint32_t len = m_cfi_data.GetU32 (&offset); |
| 307 | dw_offset_t next_entry = current_entry + len + 4; |
| 308 | dw_offset_t cie_id = m_cfi_data.GetU32 (&offset); |
| 309 | |
| 310 | if (cie_id == 0 || cie_id == UINT32_MAX) |
| 311 | { |
| 312 | m_cie_map[current_entry] = ParseCIE (current_entry); |
| 313 | offset = next_entry; |
| 314 | continue; |
| 315 | } |
| 316 | |
Greg Clayton | 63afdb0 | 2011-06-17 01:22:15 +0000 | [diff] [blame] | 317 | const dw_offset_t cie_offset = current_entry + 4 - cie_id; |
| 318 | const CIE *cie = GetCIE (cie_offset); |
| 319 | if (cie) |
| 320 | { |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 321 | const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress(); |
Greg Clayton | 63afdb0 | 2011-06-17 01:22:15 +0000 | [diff] [blame] | 322 | const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS; |
| 323 | const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS; |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 324 | |
Greg Clayton | 63afdb0 | 2011-06-17 01:22:15 +0000 | [diff] [blame] | 325 | lldb::addr_t addr = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr); |
| 326 | lldb::addr_t length = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr, text_addr, data_addr); |
| 327 | FDEEntry fde; |
| 328 | fde.bounds = AddressRange (addr, length, m_objfile.GetSectionList()); |
| 329 | fde.offset = current_entry; |
| 330 | m_fde_index.push_back(fde); |
| 331 | } |
| 332 | else |
| 333 | { |
Greg Clayton | df6dc88 | 2012-01-05 03:57:59 +0000 | [diff] [blame] | 334 | Host::SystemLog (Host::eSystemLogError, |
| 335 | "error: unable to find CIE at 0x%8.8x for cie_id = 0x%8.8x for entry at 0x%8.8x.\n", |
| 336 | cie_offset, |
| 337 | cie_id, |
| 338 | current_entry); |
Greg Clayton | 63afdb0 | 2011-06-17 01:22:15 +0000 | [diff] [blame] | 339 | } |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 340 | offset = next_entry; |
| 341 | } |
| 342 | std::sort (m_fde_index.begin(), m_fde_index.end()); |
| 343 | m_fde_index_initialized = true; |
| 344 | } |
| 345 | |
| 346 | bool |
| 347 | DWARFCallFrameInfo::FDEToUnwindPlan (dw_offset_t offset, Address startaddr, UnwindPlan& unwind_plan) |
| 348 | { |
| 349 | dw_offset_t current_entry = offset; |
| 350 | |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 351 | if (m_section_sp.get() == NULL || m_section_sp->IsEncrypted()) |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 352 | return false; |
| 353 | |
| 354 | if (m_cfi_data_initialized == false) |
Greg Clayton | d2909b4 | 2011-12-29 00:05:26 +0000 | [diff] [blame] | 355 | GetCFIData(); |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 356 | |
| 357 | uint32_t length = m_cfi_data.GetU32 (&offset); |
| 358 | dw_offset_t cie_offset = m_cfi_data.GetU32 (&offset); |
| 359 | |
| 360 | assert (cie_offset != 0 && cie_offset != UINT32_MAX); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 361 | |
| 362 | // Translate the CIE_id from the eh_frame format, which |
| 363 | // is relative to the FDE offset, into a __eh_frame section |
| 364 | // offset |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 365 | if (m_is_eh_frame) |
Jason Molenda | 8280cbe | 2010-10-25 11:12:07 +0000 | [diff] [blame] | 366 | { |
| 367 | unwind_plan.SetSourceName ("eh_frame CFI"); |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 368 | cie_offset = current_entry + 4 - cie_offset; |
Jason Molenda | 8280cbe | 2010-10-25 11:12:07 +0000 | [diff] [blame] | 369 | } |
| 370 | else |
| 371 | { |
| 372 | unwind_plan.SetSourceName ("DWARF CFI"); |
| 373 | } |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 374 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 375 | const CIE *cie = GetCIE (cie_offset); |
| 376 | assert (cie != NULL); |
| 377 | |
| 378 | const dw_offset_t end_offset = current_entry + length + 4; |
| 379 | |
Greg Clayton | b5a8f14 | 2012-02-05 02:38:54 +0000 | [diff] [blame^] | 380 | const lldb::addr_t pc_rel_addr = m_section_sp->GetFileAddress(); |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 381 | const lldb::addr_t text_addr = LLDB_INVALID_ADDRESS; |
| 382 | const lldb::addr_t data_addr = LLDB_INVALID_ADDRESS; |
| 383 | lldb::addr_t range_base = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding, pc_rel_addr, text_addr, data_addr); |
| 384 | lldb::addr_t range_len = m_cfi_data.GetGNUEHPointer(&offset, cie->ptr_encoding & DW_EH_PE_MASK_ENCODING, pc_rel_addr, text_addr, data_addr); |
| 385 | AddressRange range (range_base, m_objfile.GetAddressByteSize(), m_objfile.GetSectionList()); |
| 386 | range.SetByteSize (range_len); |
| 387 | |
| 388 | if (cie->augmentation[0] == 'z') |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 389 | { |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 390 | uint32_t aug_data_len = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 391 | offset += aug_data_len; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 392 | } |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 393 | |
| 394 | uint32_t reg_num = 0; |
| 395 | int32_t op_offset = 0; |
| 396 | uint32_t tmp_uval32; |
| 397 | uint32_t code_align = cie->code_align; |
| 398 | int32_t data_align = cie->data_align; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 399 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 400 | unwind_plan.SetPlanValidAddressRange (range); |
| 401 | UnwindPlan::Row row = cie->initial_row; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 402 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 403 | unwind_plan.SetRegisterKind (m_reg_kind); |
| 404 | |
| 405 | UnwindPlan::Row::RegisterLocation reg_location; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 406 | while (m_cfi_data.ValidOffset(offset) && offset < end_offset) |
| 407 | { |
| 408 | uint8_t inst = m_cfi_data.GetU8(&offset); |
| 409 | uint8_t primary_opcode = inst & 0xC0; |
| 410 | uint8_t extended_opcode = inst & 0x3F; |
| 411 | |
| 412 | if (primary_opcode) |
| 413 | { |
| 414 | switch (primary_opcode) |
| 415 | { |
| 416 | case DW_CFA_advance_loc : // (Row Creation Instruction) |
| 417 | { // 0x40 - high 2 bits are 0x1, lower 6 bits are delta |
| 418 | // takes a single argument that represents a constant delta. The |
| 419 | // required action is to create a new table row with a location |
| 420 | // value that is computed by taking the current entry's location |
| 421 | // value and adding (delta * code_align). All other |
| 422 | // values in the new row are initially identical to the current row. |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 423 | unwind_plan.AppendRow(row); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 424 | row.SlideOffset(extended_opcode * code_align); |
| 425 | } |
| 426 | break; |
| 427 | |
| 428 | case DW_CFA_offset : |
| 429 | { // 0x80 - high 2 bits are 0x2, lower 6 bits are register |
| 430 | // takes two arguments: an unsigned LEB128 constant representing a |
| 431 | // factored offset and a register number. The required action is to |
| 432 | // change the rule for the register indicated by the register number |
| 433 | // to be an offset(N) rule with a value of |
| 434 | // (N = factored offset * data_align). |
| 435 | reg_num = extended_opcode; |
| 436 | op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align; |
| 437 | reg_location.SetAtCFAPlusOffset(op_offset); |
| 438 | row.SetRegisterInfo (reg_num, reg_location); |
| 439 | } |
| 440 | break; |
| 441 | |
| 442 | case DW_CFA_restore : |
| 443 | { // 0xC0 - high 2 bits are 0x3, lower 6 bits are register |
| 444 | // takes a single argument that represents a register number. The |
| 445 | // required action is to change the rule for the indicated register |
| 446 | // to the rule assigned it by the initial_instructions in the CIE. |
| 447 | reg_num = extended_opcode; |
| 448 | // We only keep enough register locations around to |
| 449 | // unwind what is in our thread, and these are organized |
| 450 | // by the register index in that state, so we need to convert our |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 451 | // GCC register number from the EH frame info, to a register index |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 452 | |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 453 | if (unwind_plan.IsValidRowIndex(0) && unwind_plan.GetRowAtIndex(0).GetRegisterInfo(reg_num, reg_location)) |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 454 | row.SetRegisterInfo (reg_num, reg_location); |
| 455 | } |
| 456 | break; |
| 457 | } |
| 458 | } |
| 459 | else |
| 460 | { |
| 461 | switch (extended_opcode) |
| 462 | { |
| 463 | case DW_CFA_nop : // 0x0 |
| 464 | break; |
| 465 | |
| 466 | case DW_CFA_set_loc : // 0x1 (Row Creation Instruction) |
| 467 | { |
| 468 | // DW_CFA_set_loc takes a single argument that represents an address. |
| 469 | // The required action is to create a new table row using the |
| 470 | // specified address as the location. All other values in the new row |
| 471 | // are initially identical to the current row. The new location value |
| 472 | // should always be greater than the current one. |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 473 | unwind_plan.AppendRow(row); |
| 474 | row.SetOffset(m_cfi_data.GetPointer(&offset) - startaddr.GetFileAddress()); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 475 | } |
| 476 | break; |
| 477 | |
| 478 | case DW_CFA_advance_loc1 : // 0x2 (Row Creation Instruction) |
| 479 | { |
| 480 | // takes a single uword argument that represents a constant delta. |
| 481 | // This instruction is identical to DW_CFA_advance_loc except for the |
| 482 | // encoding and size of the delta argument. |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 483 | unwind_plan.AppendRow(row); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 484 | row.SlideOffset (m_cfi_data.GetU8(&offset) * code_align); |
| 485 | } |
| 486 | break; |
| 487 | |
| 488 | case DW_CFA_advance_loc2 : // 0x3 (Row Creation Instruction) |
| 489 | { |
| 490 | // takes a single uword argument that represents a constant delta. |
| 491 | // This instruction is identical to DW_CFA_advance_loc except for the |
| 492 | // encoding and size of the delta argument. |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 493 | unwind_plan.AppendRow(row); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 494 | row.SlideOffset (m_cfi_data.GetU16(&offset) * code_align); |
| 495 | } |
| 496 | break; |
| 497 | |
| 498 | case DW_CFA_advance_loc4 : // 0x4 (Row Creation Instruction) |
| 499 | { |
| 500 | // takes a single uword argument that represents a constant delta. |
| 501 | // This instruction is identical to DW_CFA_advance_loc except for the |
| 502 | // encoding and size of the delta argument. |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 503 | unwind_plan.AppendRow(row); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 504 | row.SlideOffset (m_cfi_data.GetU32(&offset) * code_align); |
| 505 | } |
| 506 | break; |
| 507 | |
| 508 | case DW_CFA_offset_extended : // 0x5 |
| 509 | { |
| 510 | // takes two unsigned LEB128 arguments representing a register number |
| 511 | // and a factored offset. This instruction is identical to DW_CFA_offset |
| 512 | // except for the encoding and size of the register argument. |
| 513 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 514 | op_offset = (int32_t)m_cfi_data.GetULEB128(&offset) * data_align; |
| 515 | reg_location.SetAtCFAPlusOffset(op_offset); |
| 516 | row.SetRegisterInfo (reg_num, reg_location); |
| 517 | } |
| 518 | break; |
| 519 | |
| 520 | case DW_CFA_restore_extended : // 0x6 |
| 521 | { |
| 522 | // takes a single unsigned LEB128 argument that represents a register |
| 523 | // number. This instruction is identical to DW_CFA_restore except for |
| 524 | // the encoding and size of the register argument. |
| 525 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 526 | if (unwind_plan.IsValidRowIndex(0) && unwind_plan.GetRowAtIndex(0).GetRegisterInfo(reg_num, reg_location)) |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 527 | row.SetRegisterInfo (reg_num, reg_location); |
| 528 | } |
| 529 | break; |
| 530 | |
| 531 | case DW_CFA_undefined : // 0x7 |
| 532 | { |
| 533 | // takes a single unsigned LEB128 argument that represents a register |
| 534 | // number. The required action is to set the rule for the specified |
| 535 | // register to undefined. |
| 536 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 537 | reg_location.SetUndefined(); |
| 538 | row.SetRegisterInfo (reg_num, reg_location); |
| 539 | } |
| 540 | break; |
| 541 | |
| 542 | case DW_CFA_same_value : // 0x8 |
| 543 | { |
| 544 | // takes a single unsigned LEB128 argument that represents a register |
| 545 | // number. The required action is to set the rule for the specified |
| 546 | // register to same value. |
| 547 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 548 | reg_location.SetSame(); |
| 549 | row.SetRegisterInfo (reg_num, reg_location); |
| 550 | } |
| 551 | break; |
| 552 | |
| 553 | case DW_CFA_register : // 0x9 |
| 554 | { |
| 555 | // takes two unsigned LEB128 arguments representing register numbers. |
| 556 | // The required action is to set the rule for the first register to be |
| 557 | // the second register. |
| 558 | |
| 559 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 560 | uint32_t other_reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 561 | reg_location.SetInRegister(other_reg_num); |
| 562 | row.SetRegisterInfo (reg_num, reg_location); |
| 563 | } |
| 564 | break; |
| 565 | |
| 566 | case DW_CFA_remember_state : // 0xA |
| 567 | // These instructions define a stack of information. Encountering the |
| 568 | // DW_CFA_remember_state instruction means to save the rules for every |
| 569 | // register on the current row on the stack. Encountering the |
| 570 | // DW_CFA_restore_state instruction means to pop the set of rules off |
| 571 | // the stack and place them in the current row. (This operation is |
| 572 | // useful for compilers that move epilogue code into the body of a |
| 573 | // function.) |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 574 | unwind_plan.AppendRow (row); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 575 | break; |
| 576 | |
| 577 | case DW_CFA_restore_state : // 0xB |
| 578 | // These instructions define a stack of information. Encountering the |
| 579 | // DW_CFA_remember_state instruction means to save the rules for every |
| 580 | // register on the current row on the stack. Encountering the |
| 581 | // DW_CFA_restore_state instruction means to pop the set of rules off |
| 582 | // the stack and place them in the current row. (This operation is |
| 583 | // useful for compilers that move epilogue code into the body of a |
| 584 | // function.) |
| 585 | { |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 586 | row = unwind_plan.GetRowAtIndex(unwind_plan.GetRowCount() - 1); |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 587 | } |
| 588 | break; |
| 589 | |
| 590 | case DW_CFA_def_cfa : // 0xC (CFA Definition Instruction) |
| 591 | { |
| 592 | // Takes two unsigned LEB128 operands representing a register |
| 593 | // number and a (non-factored) offset. The required action |
| 594 | // is to define the current CFA rule to use the provided |
| 595 | // register and offset. |
| 596 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 597 | op_offset = (int32_t)m_cfi_data.GetULEB128(&offset); |
| 598 | row.SetCFARegister (reg_num); |
| 599 | row.SetCFAOffset (op_offset); |
| 600 | } |
| 601 | break; |
| 602 | |
| 603 | case DW_CFA_def_cfa_register : // 0xD (CFA Definition Instruction) |
| 604 | { |
| 605 | // takes a single unsigned LEB128 argument representing a register |
| 606 | // number. The required action is to define the current CFA rule to |
| 607 | // use the provided register (but to keep the old offset). |
| 608 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 609 | row.SetCFARegister (reg_num); |
| 610 | } |
| 611 | break; |
| 612 | |
| 613 | case DW_CFA_def_cfa_offset : // 0xE (CFA Definition Instruction) |
| 614 | { |
| 615 | // Takes a single unsigned LEB128 operand representing a |
| 616 | // (non-factored) offset. The required action is to define |
| 617 | // the current CFA rule to use the provided offset (but |
| 618 | // to keep the old register). |
| 619 | op_offset = (int32_t)m_cfi_data.GetULEB128(&offset); |
| 620 | row.SetCFAOffset (op_offset); |
| 621 | } |
| 622 | break; |
| 623 | |
| 624 | case DW_CFA_def_cfa_expression : // 0xF (CFA Definition Instruction) |
| 625 | { |
| 626 | size_t block_len = (size_t)m_cfi_data.GetULEB128(&offset); |
| 627 | offset += (uint32_t)block_len; |
| 628 | } |
| 629 | break; |
| 630 | |
| 631 | case DW_CFA_expression : // 0x10 |
| 632 | { |
| 633 | // Takes two operands: an unsigned LEB128 value representing |
| 634 | // a register number, and a DW_FORM_block value representing a DWARF |
| 635 | // expression. The required action is to change the rule for the |
| 636 | // register indicated by the register number to be an expression(E) |
| 637 | // rule where E is the DWARF expression. That is, the DWARF |
| 638 | // expression computes the address. The value of the CFA is |
| 639 | // pushed on the DWARF evaluation stack prior to execution of |
| 640 | // the DWARF expression. |
| 641 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 642 | uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 643 | const uint8_t *block_data = (uint8_t *)m_cfi_data.GetData(&offset, block_len); |
| 644 | |
| 645 | reg_location.SetAtDWARFExpression(block_data, block_len); |
| 646 | row.SetRegisterInfo (reg_num, reg_location); |
| 647 | } |
| 648 | break; |
| 649 | |
| 650 | case DW_CFA_offset_extended_sf : // 0x11 |
| 651 | { |
| 652 | // takes two operands: an unsigned LEB128 value representing a |
| 653 | // register number and a signed LEB128 factored offset. This |
| 654 | // instruction is identical to DW_CFA_offset_extended except |
| 655 | //that the second operand is signed and factored. |
| 656 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 657 | op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align; |
| 658 | reg_location.SetAtCFAPlusOffset(op_offset); |
| 659 | row.SetRegisterInfo (reg_num, reg_location); |
| 660 | } |
| 661 | break; |
| 662 | |
| 663 | case DW_CFA_def_cfa_sf : // 0x12 (CFA Definition Instruction) |
| 664 | { |
| 665 | // Takes two operands: an unsigned LEB128 value representing |
| 666 | // a register number and a signed LEB128 factored offset. |
| 667 | // This instruction is identical to DW_CFA_def_cfa except |
| 668 | // that the second operand is signed and factored. |
| 669 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 670 | op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align; |
| 671 | row.SetCFARegister (reg_num); |
| 672 | row.SetCFAOffset (op_offset); |
| 673 | } |
| 674 | break; |
| 675 | |
| 676 | case DW_CFA_def_cfa_offset_sf : // 0x13 (CFA Definition Instruction) |
| 677 | { |
| 678 | // takes a signed LEB128 operand representing a factored |
| 679 | // offset. This instruction is identical to DW_CFA_def_cfa_offset |
| 680 | // except that the operand is signed and factored. |
| 681 | op_offset = (int32_t)m_cfi_data.GetSLEB128(&offset) * data_align; |
| 682 | row.SetCFAOffset (op_offset); |
| 683 | } |
| 684 | break; |
| 685 | |
| 686 | case DW_CFA_val_expression : // 0x16 |
| 687 | { |
| 688 | // takes two operands: an unsigned LEB128 value representing a register |
| 689 | // number, and a DW_FORM_block value representing a DWARF expression. |
| 690 | // The required action is to change the rule for the register indicated |
| 691 | // by the register number to be a val_expression(E) rule where E is the |
| 692 | // DWARF expression. That is, the DWARF expression computes the value of |
| 693 | // the given register. The value of the CFA is pushed on the DWARF |
| 694 | // evaluation stack prior to execution of the DWARF expression. |
| 695 | reg_num = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 696 | uint32_t block_len = (uint32_t)m_cfi_data.GetULEB128(&offset); |
| 697 | const uint8_t* block_data = (uint8_t*)m_cfi_data.GetData(&offset, block_len); |
| 698 | //#if defined(__i386__) || defined(__x86_64__) |
| 699 | // // The EH frame info for EIP and RIP contains code that looks for traps to |
| 700 | // // be a specific type and increments the PC. |
| 701 | // // For i386: |
| 702 | // // DW_CFA_val_expression where: |
| 703 | // // eip = DW_OP_breg6(+28), DW_OP_deref, DW_OP_dup, DW_OP_plus_uconst(0x34), |
| 704 | // // DW_OP_deref, DW_OP_swap, DW_OP_plus_uconst(0), DW_OP_deref, |
| 705 | // // DW_OP_dup, DW_OP_lit3, DW_OP_ne, DW_OP_swap, DW_OP_lit4, DW_OP_ne, |
| 706 | // // DW_OP_and, DW_OP_plus |
| 707 | // // This basically does a: |
| 708 | // // eip = ucontenxt.mcontext32->gpr.eip; |
| 709 | // // if (ucontenxt.mcontext32->exc.trapno != 3 && ucontenxt.mcontext32->exc.trapno != 4) |
| 710 | // // eip++; |
| 711 | // // |
| 712 | // // For x86_64: |
| 713 | // // DW_CFA_val_expression where: |
| 714 | // // rip = DW_OP_breg3(+48), DW_OP_deref, DW_OP_dup, DW_OP_plus_uconst(0x90), DW_OP_deref, |
| 715 | // // DW_OP_swap, DW_OP_plus_uconst(0), DW_OP_deref_size(4), DW_OP_dup, DW_OP_lit3, |
| 716 | // // DW_OP_ne, DW_OP_swap, DW_OP_lit4, DW_OP_ne, DW_OP_and, DW_OP_plus |
| 717 | // // This basically does a: |
| 718 | // // rip = ucontenxt.mcontext64->gpr.rip; |
| 719 | // // if (ucontenxt.mcontext64->exc.trapno != 3 && ucontenxt.mcontext64->exc.trapno != 4) |
| 720 | // // rip++; |
| 721 | // // The trap comparisons and increments are not needed as it hoses up the unwound PC which |
| 722 | // // is expected to point at least past the instruction that causes the fault/trap. So we |
| 723 | // // take it out by trimming the expression right at the first "DW_OP_swap" opcodes |
| 724 | // if (block_data != NULL && thread->GetPCRegNum(Thread::GCC) == reg_num) |
| 725 | // { |
| 726 | // if (thread->Is64Bit()) |
| 727 | // { |
| 728 | // if (block_len > 9 && block_data[8] == DW_OP_swap && block_data[9] == DW_OP_plus_uconst) |
| 729 | // block_len = 8; |
| 730 | // } |
| 731 | // else |
| 732 | // { |
| 733 | // if (block_len > 8 && block_data[7] == DW_OP_swap && block_data[8] == DW_OP_plus_uconst) |
| 734 | // block_len = 7; |
| 735 | // } |
| 736 | // } |
| 737 | //#endif |
| 738 | reg_location.SetIsDWARFExpression(block_data, block_len); |
| 739 | row.SetRegisterInfo (reg_num, reg_location); |
| 740 | } |
| 741 | break; |
| 742 | |
| 743 | case DW_CFA_val_offset : // 0x14 |
| 744 | case DW_CFA_val_offset_sf : // 0x15 |
| 745 | default: |
| 746 | tmp_uval32 = extended_opcode; |
| 747 | break; |
| 748 | } |
| 749 | } |
| 750 | } |
Jason Molenda | 3a4ea24 | 2010-09-10 07:49:16 +0000 | [diff] [blame] | 751 | unwind_plan.AppendRow(row); |
| 752 | |
| 753 | return true; |
Chris Lattner | 24943d2 | 2010-06-08 16:52:24 +0000 | [diff] [blame] | 754 | } |