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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 | #!/usr/bin/env python3 ''' How to Use: Load in LLDB: (lldb) command script import ./tests/unit/tools/fibers_lldb.py Run the commands: (lldb) fibers_all # Lists all existing fibers (lldb) fibers_ready # Lists fibers in the run queue (lldb) fibers_current # Gets information about the current fiber (lldb) fibers_regs [id] # Get the registers saved in the fiber end (default current fiber) ''' import lldb import sys def fiber_state_to_string(state): """Converts a fiber state integer to a human-readable string.""" states = [] if state & 0x1: states.append("RUN") if state & 0x2: states.append("STOP") if state & 0x4: states.append("WAIT") if state & 0x8: states.append("JOIN") if state & 0x10: states.append("DEAD") return "|".join(states) if states else "UNKNOWN" def strip_pointer(target, addr): """Strips the PAC signature from a pointer.""" val = target.CreateValueFromAddress("__tmp_strip_pac", lldb.SBAddress(addr, target), target.FindFirstType("unsigned long long")) val.SetPreferDynamicValue(lldb.eNoDynamicValues) val = val.AddressOf() return val.GetValueAsAddress() def strip_fp_lr_sp(process, target, fp, lr, sp): """Strip manged registers in the jmp buf from the munge token and PAC.""" # get the munge token (see __longjmp impl) frame = process.selected_thread.GetFrameAtIndex(0) # ref. os/tsd.h # define __TSD_PTR_MUNGE 7 munge_token = frame.EvaluateExpression('({void** r; __asm__("mrs %0, TPIDRRO_EL0" : "=r"(r)); r[7];})') if munge_token.GetError().Fail(): return None munge_token = munge_token.GetValueAsAddress() fp = strip_pointer(target, fp ^ munge_token) lr = strip_pointer(target, lr ^ munge_token) sp = strip_pointer(target, sp ^ munge_token) return (fp, lr, sp) def get_fiber_info(debugger, fiber_value): """Retrieves information about a fiber from its SBValue address.""" if not fiber_value or not fiber_value.IsValid(): return None fiber_address = fiber_value.GetValueAsAddress() fiber_id_value = fiber_value.GetChildMemberWithName('id') fiber_id_state = fiber_value.GetChildMemberWithName('state') stack_bottom_value = fiber_value.GetChildMemberWithName('stack_bottom') env_value = fiber_value.GetChildMemberWithName('env') if not fiber_id_value.IsValid() or not fiber_id_state.IsValid() or not stack_bottom_value.IsValid() or not env_value.IsValid(): print(f"Error reading fiber memory") return None fiber_id = fiber_id_value.GetValueAsUnsigned() fiber_state = fiber_id_state.GetValueAsUnsigned() stack_bottom = stack_bottom_value.GetValueAsAddress() env_address = env_value.AddressOf().GetValueAsAddress() return { "id": fiber_id, "address": fiber_address, "state": fiber_state, "state_str": fiber_state_to_string(fiber_state), "stack_bottom": stack_bottom, "env_address": env_address } def print_stack_trace_from_jmp_buf(debugger, fiber_info, result, arch): """Prints a stack trace by manually walking the stack.""" target = debugger.GetSelectedTarget() process = target.GetProcess() env_address = fiber_info["env_address"] error = lldb.SBError() addr_size = target.GetAddressByteSize() if arch == "x86_64": result.AppendMessage(f" Error: Register printing is not supported on x86_64.") return elif arch == "arm64": FP_OFFSET = 80 LR_OFFSET = 88 SP_OFFSET = 96 fp = process.ReadPointerFromMemory(env_address + FP_OFFSET, error) lr = process.ReadPointerFromMemory(env_address + LR_OFFSET, error) sp = process.ReadPointerFromMemory(env_address + SP_OFFSET, error) if error.Fail(): result.AppendMessage(f" Error: Could not read registers from jmp_buf: {error}") return strip_res = strip_fp_lr_sp(process, target, fp, lr, sp) if strip_res is None: result.AppendMessage(f" Error: Could not strip FP LR or SP") return fp, lr, sp = strip_res result.AppendMessage(f" Stack trace for fiber {fiber_info['id']} (manual backtrace):") for i in range(10): # Limit to 10 frames for simplicity symbol_context = target.ResolveSymbolContextForAddress(lldb.SBAddress(lr, target), lldb.eSymbolContextEverything) symbol = symbol_context.GetSymbol() if symbol: symbol_name = symbol.GetName() else: symbol_name = "unknown" result.AppendMessage(f" #{i}: 0x{lr:x} {symbol_name}") next_fp = process.ReadPointerFromMemory(fp, error) if error.Fail(): result.AppendMessage(f" Error: Could not read next FP from memory: {error}") break next_lr = process.ReadPointerFromMemory(fp + 8, error) # read next LR from the stack using current SP if error.Fail(): result.AppendMessage(f" Error: Could not read next LR from memory: {error}") break if next_lr == 0: result.AppendMessage(" End of stack or error reading memory.") break next_lr = strip_pointer(target, next_lr) lr = next_lr fp = next_fp else: result.AppendMessage(f" Error: Unsupported architecture: {arch}") return def list_fibers_all(debugger, command, result, internal_dict, arch): """Lists all existing fibers.""" list_fibers_from_queue(debugger, command, result, internal_dict, "fibers_existing_queue", "All Existing Fibers", arch) def list_fibers_ready(debugger, command, result, internal_dict, arch): """Lists fibers in the run queue (now called 'ready').""" list_fibers_from_queue(debugger, command, result, internal_dict, "fibers_run_queue", "Ready Fibers (Run Queue)", arch) def list_fibers_from_queue(debugger, command, result, internal_dict, queue_name, title, arch): """Lists fibers from a specified queue.""" target = debugger.GetSelectedTarget() queue_var = target.FindFirstGlobalVariable(queue_name) if not queue_var.IsValid(): result.SetError(f"Could not find '{queue_name}' global variable.") return result.AppendMessage(f"{title}:") result.AppendMessage("-------") queue_top_value = queue_var.GetChildMemberWithName('top') if not queue_top_value.IsValid(): result.SetError(f"Could not find '{queue_name}.top' field.") return fiber_value = queue_top_value while fiber_value and fiber_value.IsValid(): fiber = get_fiber_info(debugger, fiber_value) if fiber: result.AppendMessage(f" ID: {fiber['id']}, Address: 0x{fiber['address']:x}, State: {fiber['state_str']}, Stack Bottom: 0x{fiber['stack_bottom']:x}") try: print_stack_trace_from_jmp_buf(debugger, fiber, result, arch) # Optional: Add stack traces except Exception as err: result.AppendMessage(f"Error: failed to get a stacktrace: {err}") break else: result.AppendMessage(f"Warning: Could not read fiber at address 0x{fiber_value.GetValueAsUnsigned():x}") break if queue_name == "fibers_existing_queue": next_fiber_value = fiber_value.GetChildMemberWithName('next_existing') else: next_fiber_value = fiber_value.GetChildMemberWithName('next') if not next_fiber_value.IsValid(): break fiber_value = next_fiber_value def get_current_fiber_info(debugger, command, result, internal_dict, arch): """Gets and prints information about the current fiber.""" target = debugger.GetSelectedTarget() fibers_current_var = target.FindFirstGlobalVariable("fibers_current") if not fibers_current_var.IsValid(): result.SetError("Could not find 'fibers_current' global variable.") return current_fiber = get_fiber_info(debugger, fibers_current_var) if not current_fiber: result.AppendMessage("No current fiber.") return result.AppendMessage("Current Fiber Information:") result.AppendMessage("--------------------------") result.AppendMessage(f" ID: {current_fiber['id']}") result.AppendMessage(f" Address: 0x{current_fiber['address']:x}") result.AppendMessage(f" State: {current_fiber['state_str']}") result.AppendMessage(f" Stack Bottom: 0x{current_fiber['stack_bottom']:x}") try: print_stack_trace_from_jmp_buf(debugger, current_fiber, result, arch) # Optional: Add stack traces except Exception as err: print(f"Error: failed to get a stacktrace: {err}") def print_fiber_registers(debugger, command, result, internal_dict, arch, fiber_id=None): """Prints the registers of a specified fiber.""" target = debugger.GetSelectedTarget() process = target.GetProcess() if fiber_id is None: fibers_current_var = target.FindFirstGlobalVariable("fibers_current") if not fibers_current_var.IsValid(): result.SetError("Could not find 'fibers_current' global variable.") return current_fiber = get_fiber_info(debugger, fibers_current_var) if not current_fiber: result.AppendMessage("No current fiber.") return else: # find the specified fiber in the existing queue fiber_address = None existing_queue_var = target.FindFirstGlobalVariable("fibers_existing_queue") if not existing_queue_var.IsValid(): result.SetError("Could not find 'fibers_existing_queue' global variable.") return queue_top_value = existing_queue_var.GetChildMemberWithName('top') if not queue_top_value.IsValid(): result.SetError(f"Could not find '{existing_queue_var.GetName()}.top' field.") return fiber_value = queue_top_value while fiber_value and fiber_value.IsValid(): temp_fiber = get_fiber_info(debugger, fiber_value) if temp_fiber and temp_fiber['id'] == int(fiber_id): current_fiber = temp_fiber break next_fiber_value = fiber_value.GetChildMemberWithName('next_existing') if not next_fiber_value.IsValid(): break fiber_value = next_fiber_value if not current_fiber: result.AppendMessage(f"Fiber with ID {fiber_id} not found.") return env_address = current_fiber["env_address"] error = lldb.SBError() addr_size = target.GetAddressByteSize() if arch == "x86_64": result.AppendMessage(f" Error: Register printing is not supported on x86_64.") return elif arch == "arm64": # reference: libplatform src/setjmp/arm64/setjmp.s __longjmp X19_OFFSET = 0 X20_OFFSET = 8 X21_OFFSET = 16 X22_OFFSET = 24 X23_OFFSET = 32 X24_OFFSET = 40 X25_OFFSET = 48 X26_OFFSET = 56 X27_OFFSET = 64 X28_OFFSET = 72 FP_OFFSET = 80 LR_OFFSET = 88 SP_OFFSET = 96 x19 = process.ReadPointerFromMemory(env_address + X19_OFFSET, error) x20 = process.ReadPointerFromMemory(env_address + X20_OFFSET, error) x21 = process.ReadPointerFromMemory(env_address + X21_OFFSET, error) x22 = process.ReadPointerFromMemory(env_address + X22_OFFSET, error) x23 = process.ReadPointerFromMemory(env_address + X23_OFFSET, error) x24 = process.ReadPointerFromMemory(env_address + X24_OFFSET, error) x25 = process.ReadPointerFromMemory(env_address + X25_OFFSET, error) x26 = process.ReadPointerFromMemory(env_address + X26_OFFSET, error) x27 = process.ReadPointerFromMemory(env_address + X27_OFFSET, error) x28 = process.ReadPointerFromMemory(env_address + X28_OFFSET, error) fp = process.ReadPointerFromMemory(env_address + FP_OFFSET, error) lr = process.ReadPointerFromMemory(env_address + LR_OFFSET, error) sp = process.ReadPointerFromMemory(env_address + SP_OFFSET, error) if error.Fail(): result.AppendMessage(f" Error: Could not read registers from jmp_buf: {error}") return strip_res = strip_fp_lr_sp(process, target, fp, lr, sp) if strip_res is None: result.AppendMessage(f" Error: Could not strip FP LR or SP") return fp, lr, sp = strip_res result.AppendMessage(f"Fiber {current_fiber['id']} Registers (arm64):") result.AppendMessage("-----------------------------") result.AppendMessage(f" X19: 0x{x19:x}") result.AppendMessage(f" X20: 0x{x20:x}") result.AppendMessage(f" X21: 0x{x21:x}") result.AppendMessage(f" X22: 0x{x22:x}") result.AppendMessage(f" X23: 0x{x23:x}") result.AppendMessage(f" X24: 0x{x24:x}") result.AppendMessage(f" X25: 0x{x25:x}") result.AppendMessage(f" X26: 0x{x26:x}") result.AppendMessage(f" X27: 0x{x27:x}") result.AppendMessage(f" X28: 0x{x28:x}") result.AppendMessage(f" LR: 0x{lr:x}") result.AppendMessage(f" FP: 0x{fp:x}") result.AppendMessage(f" SP: 0x{sp:x}") else: result.AppendMessage(f" Error: Unsupported architecture: {arch}") return arch = None def list_fibers_all_cmd(debugger, command, result, internal_dict): list_fibers_all(debugger, command, result, internal_dict, arch) def list_fibers_ready_cmd(debugger, command, result, internal_dict): list_fibers_ready(debugger, command, result, internal_dict, arch) def get_current_fiber_info_cmd(debugger, command, result, internal_dict): get_current_fiber_info(debugger, command, result, internal_dict, arch) def print_fiber_registers_cmd(debugger, command, result, internal_dict): """Prints the registers of a specified fiber.""" args = command.split() fiber_id = None if len(args) > 0: try: fiber_id = int(args[0]) except ValueError: result.SetError("Invalid fiber ID. Please provide an integer.") return print_fiber_registers(debugger, command, result, internal_dict, arch, fiber_id) def __lldb_init_module(debugger, internal_dict): global arch """LLDB calls this function to load the script.""" target = debugger.GetSelectedTarget() platform = target.GetPlatform() if platform: platform_name = platform.GetTriple() if "x86_64" in platform_name: arch = "x86_64" elif "arm64" in platform_name or "aarch64" in platform_name: arch = "arm64" else: print(f"Warning: Unsupported architecture: {platform_name}. Stack traces may not work.") arch = "unknown" else: print("Warning: Could not get platform information. Stack traces may not work.") arch = "unknown" debugger.HandleCommand('command script add -f fibers_lldb.list_fibers_all_cmd fibers_all') debugger.HandleCommand('command script add -f fibers_lldb.list_fibers_ready_cmd fibers_ready') debugger.HandleCommand('command script add -f fibers_lldb.get_current_fiber_info_cmd fibers_current') debugger.HandleCommand('command script add -f fibers_lldb.print_fiber_registers_cmd fibers_regs') print("The 'fibers_all', 'fibers_ready', 'fibers_current', and 'fibers_regs' commands have been added.") print(f"Detected architecture: {arch}") |