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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 | // SPDX-License-Identifier: GPL-2.0-only /* * PowerPC backend to the KGDB stub. * * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu) * Copyright (C) 2003 Timesys Corporation. * Copyright (C) 2004-2006 MontaVista Software, Inc. * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com) * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and * Sergei Shtylyov <sshtylyov@ru.mvista.com> * Copyright (C) 2007-2008 Wind River Systems, Inc. */ #include <linux/kernel.h> #include <linux/kgdb.h> #include <linux/smp.h> #include <linux/signal.h> #include <linux/ptrace.h> #include <linux/kdebug.h> #include <asm/current.h> #include <asm/processor.h> #include <asm/machdep.h> #include <asm/debug.h> #include <asm/code-patching.h> #include <linux/slab.h> #include <asm/inst.h> /* * This table contains the mapping between PowerPC hardware trap types, and * signals, which are primarily what GDB understands. GDB and the kernel * don't always agree on values, so we use constants taken from gdb-6.2. */ static struct hard_trap_info { unsigned int tt; /* Trap type code for powerpc */ unsigned char signo; /* Signal that we map this trap into */ } hard_trap_info[] = { { 0x0100, 0x02 /* SIGINT */ }, /* system reset */ { 0x0200, 0x0b /* SIGSEGV */ }, /* machine check */ { 0x0300, 0x0b /* SIGSEGV */ }, /* data access */ { 0x0400, 0x0b /* SIGSEGV */ }, /* instruction access */ { 0x0500, 0x02 /* SIGINT */ }, /* external interrupt */ { 0x0600, 0x0a /* SIGBUS */ }, /* alignment */ { 0x0700, 0x05 /* SIGTRAP */ }, /* program check */ { 0x0800, 0x08 /* SIGFPE */ }, /* fp unavailable */ { 0x0900, 0x0e /* SIGALRM */ }, /* decrementer */ { 0x0c00, 0x14 /* SIGCHLD */ }, /* system call */ #ifdef CONFIG_BOOKE_OR_40x { 0x2002, 0x05 /* SIGTRAP */ }, /* debug */ #if defined(CONFIG_PPC_85xx) { 0x2010, 0x08 /* SIGFPE */ }, /* spe unavailable */ { 0x2020, 0x08 /* SIGFPE */ }, /* spe unavailable */ { 0x2030, 0x08 /* SIGFPE */ }, /* spe fp data */ { 0x2040, 0x08 /* SIGFPE */ }, /* spe fp data */ { 0x2050, 0x08 /* SIGFPE */ }, /* spe fp round */ { 0x2060, 0x0e /* SIGILL */ }, /* performance monitor */ { 0x2900, 0x08 /* SIGFPE */ }, /* apu unavailable */ { 0x3100, 0x0e /* SIGALRM */ }, /* fixed interval timer */ { 0x3200, 0x02 /* SIGINT */ }, /* watchdog */ #else /* ! CONFIG_PPC_85xx */ { 0x1000, 0x0e /* SIGALRM */ }, /* prog interval timer */ { 0x1010, 0x0e /* SIGALRM */ }, /* fixed interval timer */ { 0x1020, 0x02 /* SIGINT */ }, /* watchdog */ { 0x2010, 0x08 /* SIGFPE */ }, /* fp unavailable */ { 0x2020, 0x08 /* SIGFPE */ }, /* ap unavailable */ #endif #else /* !CONFIG_BOOKE_OR_40x */ { 0x0d00, 0x05 /* SIGTRAP */ }, /* single-step */ #if defined(CONFIG_PPC_8xx) { 0x1000, 0x04 /* SIGILL */ }, /* software emulation */ #else /* ! CONFIG_PPC_8xx */ { 0x0f00, 0x04 /* SIGILL */ }, /* performance monitor */ { 0x0f20, 0x08 /* SIGFPE */ }, /* altivec unavailable */ { 0x1300, 0x05 /* SIGTRAP */ }, /* instruction address break */ #if defined(CONFIG_PPC64) { 0x1200, 0x05 /* SIGILL */ }, /* system error */ { 0x1500, 0x04 /* SIGILL */ }, /* soft patch */ { 0x1600, 0x04 /* SIGILL */ }, /* maintenance */ { 0x1700, 0x08 /* SIGFPE */ }, /* altivec assist */ { 0x1800, 0x04 /* SIGILL */ }, /* thermal */ #else /* ! CONFIG_PPC64 */ { 0x1400, 0x02 /* SIGINT */ }, /* SMI */ { 0x1600, 0x08 /* SIGFPE */ }, /* altivec assist */ { 0x1700, 0x04 /* SIGILL */ }, /* TAU */ { 0x2000, 0x05 /* SIGTRAP */ }, /* run mode */ #endif #endif #endif { 0x0000, 0x00 } /* Must be last */ }; static int computeSignal(unsigned int tt) { struct hard_trap_info *ht; for (ht = hard_trap_info; ht->tt && ht->signo; ht++) if (ht->tt == tt) return ht->signo; return SIGHUP; /* default for things we don't know about */ } /** * * kgdb_skipexception - Bail out of KGDB when we've been triggered. * @exception: Exception vector number * @regs: Current &struct pt_regs. * * On some architectures we need to skip a breakpoint exception when * it occurs after a breakpoint has been removed. * */ int kgdb_skipexception(int exception, struct pt_regs *regs) { return kgdb_isremovedbreak(regs->nip); } static int kgdb_debugger_ipi(struct pt_regs *regs) { kgdb_nmicallback(raw_smp_processor_id(), regs); return 0; } #ifdef CONFIG_SMP void kgdb_roundup_cpus(void) { smp_send_debugger_break(); } #endif /* KGDB functions to use existing PowerPC64 hooks. */ static int kgdb_debugger(struct pt_regs *regs) { return !kgdb_handle_exception(1, computeSignal(TRAP(regs)), DIE_OOPS, regs); } static int kgdb_handle_breakpoint(struct pt_regs *regs) { if (user_mode(regs)) return 0; if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0) return 0; if (*(u32 *)regs->nip == BREAK_INSTR) regs_add_return_ip(regs, BREAK_INSTR_SIZE); return 1; } static int kgdb_singlestep(struct pt_regs *regs) { if (user_mode(regs)) return 0; kgdb_handle_exception(0, SIGTRAP, 0, regs); return 1; } static int kgdb_iabr_match(struct pt_regs *regs) { if (user_mode(regs)) return 0; if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) return 0; return 1; } static int kgdb_break_match(struct pt_regs *regs) { if (user_mode(regs)) return 0; if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0) return 0; return 1; } #define PACK64(ptr, src) do { *(ptr++) = (src); } while (0) #define PACK32(ptr, src) do { \ u32 *ptr32; \ ptr32 = (u32 *)ptr; \ *(ptr32++) = (src); \ ptr = (unsigned long *)ptr32; \ } while (0) void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) { struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp + STACK_INT_FRAME_REGS); unsigned long *ptr = gdb_regs; int reg; memset(gdb_regs, 0, NUMREGBYTES); /* Regs GPR0-2 */ for (reg = 0; reg < 3; reg++) PACK64(ptr, regs->gpr[reg]); /* Regs GPR3-13 are caller saved, not in regs->gpr[] */ ptr += 11; /* Regs GPR14-31 */ for (reg = 14; reg < 32; reg++) PACK64(ptr, regs->gpr[reg]); #ifdef CONFIG_PPC_85xx #ifdef CONFIG_SPE for (reg = 0; reg < 32; reg++) PACK64(ptr, p->thread.evr[reg]); #else ptr += 32; #endif #else /* fp registers not used by kernel, leave zero */ ptr += 32 * 8 / sizeof(long); #endif PACK64(ptr, regs->nip); PACK64(ptr, regs->msr); PACK32(ptr, regs->ccr); PACK64(ptr, regs->link); PACK64(ptr, regs->ctr); PACK32(ptr, regs->xer); BUG_ON((unsigned long)ptr > (unsigned long)(((void *)gdb_regs) + NUMREGBYTES)); } #define GDB_SIZEOF_REG sizeof(unsigned long) #define GDB_SIZEOF_REG_U32 sizeof(u32) #ifdef CONFIG_PPC_85xx #define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long) #else #define GDB_SIZEOF_FLOAT_REG sizeof(u64) #endif struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = { { "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) }, { "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) }, { "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) }, { "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) }, { "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) }, { "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) }, { "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) }, { "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) }, { "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) }, { "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) }, { "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) }, { "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) }, { "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) }, { "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) }, { "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) }, { "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) }, { "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) }, { "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) }, { "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) }, { "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) }, { "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) }, { "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) }, { "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) }, { "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) }, { "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) }, { "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) }, { "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) }, { "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) }, { "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) }, { "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) }, { "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) }, { "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) }, { "f0", GDB_SIZEOF_FLOAT_REG, 0 }, { "f1", GDB_SIZEOF_FLOAT_REG, 1 }, { "f2", GDB_SIZEOF_FLOAT_REG, 2 }, { "f3", GDB_SIZEOF_FLOAT_REG, 3 }, { "f4", GDB_SIZEOF_FLOAT_REG, 4 }, { "f5", GDB_SIZEOF_FLOAT_REG, 5 }, { "f6", GDB_SIZEOF_FLOAT_REG, 6 }, { "f7", GDB_SIZEOF_FLOAT_REG, 7 }, { "f8", GDB_SIZEOF_FLOAT_REG, 8 }, { "f9", GDB_SIZEOF_FLOAT_REG, 9 }, { "f10", GDB_SIZEOF_FLOAT_REG, 10 }, { "f11", GDB_SIZEOF_FLOAT_REG, 11 }, { "f12", GDB_SIZEOF_FLOAT_REG, 12 }, { "f13", GDB_SIZEOF_FLOAT_REG, 13 }, { "f14", GDB_SIZEOF_FLOAT_REG, 14 }, { "f15", GDB_SIZEOF_FLOAT_REG, 15 }, { "f16", GDB_SIZEOF_FLOAT_REG, 16 }, { "f17", GDB_SIZEOF_FLOAT_REG, 17 }, { "f18", GDB_SIZEOF_FLOAT_REG, 18 }, { "f19", GDB_SIZEOF_FLOAT_REG, 19 }, { "f20", GDB_SIZEOF_FLOAT_REG, 20 }, { "f21", GDB_SIZEOF_FLOAT_REG, 21 }, { "f22", GDB_SIZEOF_FLOAT_REG, 22 }, { "f23", GDB_SIZEOF_FLOAT_REG, 23 }, { "f24", GDB_SIZEOF_FLOAT_REG, 24 }, { "f25", GDB_SIZEOF_FLOAT_REG, 25 }, { "f26", GDB_SIZEOF_FLOAT_REG, 26 }, { "f27", GDB_SIZEOF_FLOAT_REG, 27 }, { "f28", GDB_SIZEOF_FLOAT_REG, 28 }, { "f29", GDB_SIZEOF_FLOAT_REG, 29 }, { "f30", GDB_SIZEOF_FLOAT_REG, 30 }, { "f31", GDB_SIZEOF_FLOAT_REG, 31 }, { "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) }, { "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) }, { "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) }, { "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) }, { "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) }, { "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) }, }; char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) { if (regno >= DBG_MAX_REG_NUM || regno < 0) return NULL; if (regno < 32 || regno >= 64) /* First 0 -> 31 gpr registers*/ /* pc, msr, ls... registers 64 -> 69 */ memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, dbg_reg_def[regno].size); if (regno >= 32 && regno < 64) { /* FP registers 32 -> 63 */ #if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) if (current) memcpy(mem, ¤t->thread.evr[regno-32], dbg_reg_def[regno].size); #else /* fp registers not used by kernel, leave zero */ memset(mem, 0, dbg_reg_def[regno].size); #endif } return dbg_reg_def[regno].name; } int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) { if (regno >= DBG_MAX_REG_NUM || regno < 0) return -EINVAL; if (regno < 32 || regno >= 64) /* First 0 -> 31 gpr registers*/ /* pc, msr, ls... registers 64 -> 69 */ memcpy((void *)regs + dbg_reg_def[regno].offset, mem, dbg_reg_def[regno].size); if (regno >= 32 && regno < 64) { /* FP registers 32 -> 63 */ #if defined(CONFIG_PPC_85xx) && defined(CONFIG_SPE) memcpy(¤t->thread.evr[regno-32], mem, dbg_reg_def[regno].size); #else /* fp registers not used by kernel, leave zero */ return 0; #endif } return 0; } void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc) { regs_set_return_ip(regs, pc); } /* * This function does PowerPC specific processing for interfacing to gdb. */ int kgdb_arch_handle_exception(int vector, int signo, int err_code, char *remcom_in_buffer, char *remcom_out_buffer, struct pt_regs *linux_regs) { char *ptr = &remcom_in_buffer[1]; unsigned long addr; switch (remcom_in_buffer[0]) { /* * sAA..AA Step one instruction from AA..AA * This will return an error to gdb .. */ case 's': case 'c': /* handle the optional parameter */ if (kgdb_hex2long(&ptr, &addr)) regs_set_return_ip(linux_regs, addr); atomic_set(&kgdb_cpu_doing_single_step, -1); /* set the trace bit if we're stepping */ if (remcom_in_buffer[0] == 's') { #ifdef CONFIG_PPC_ADV_DEBUG_REGS mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE); #else regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE); #endif atomic_set(&kgdb_cpu_doing_single_step, raw_smp_processor_id()); } return 0; } return -1; } int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) { u32 instr, *addr = (u32 *)bpt->bpt_addr; int err; err = get_kernel_nofault(instr, addr); if (err) return err; err = patch_instruction(addr, ppc_inst(BREAK_INSTR)); if (err) return -EFAULT; *(u32 *)bpt->saved_instr = instr; return 0; } int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) { int err; unsigned int instr = *(unsigned int *)bpt->saved_instr; u32 *addr = (u32 *)bpt->bpt_addr; err = patch_instruction(addr, ppc_inst(instr)); if (err) return -EFAULT; return 0; } /* * Global data */ const struct kgdb_arch arch_kgdb_ops; static int kgdb_not_implemented(struct pt_regs *regs) { return 0; } static void *old__debugger_ipi; static void *old__debugger; static void *old__debugger_bpt; static void *old__debugger_sstep; static void *old__debugger_iabr_match; static void *old__debugger_break_match; static void *old__debugger_fault_handler; int kgdb_arch_init(void) { old__debugger_ipi = __debugger_ipi; old__debugger = __debugger; old__debugger_bpt = __debugger_bpt; old__debugger_sstep = __debugger_sstep; old__debugger_iabr_match = __debugger_iabr_match; old__debugger_break_match = __debugger_break_match; old__debugger_fault_handler = __debugger_fault_handler; __debugger_ipi = kgdb_debugger_ipi; __debugger = kgdb_debugger; __debugger_bpt = kgdb_handle_breakpoint; __debugger_sstep = kgdb_singlestep; __debugger_iabr_match = kgdb_iabr_match; __debugger_break_match = kgdb_break_match; __debugger_fault_handler = kgdb_not_implemented; return 0; } void kgdb_arch_exit(void) { __debugger_ipi = old__debugger_ipi; __debugger = old__debugger; __debugger_bpt = old__debugger_bpt; __debugger_sstep = old__debugger_sstep; __debugger_iabr_match = old__debugger_iabr_match; __debugger_break_match = old__debugger_break_match; __debugger_fault_handler = old__debugger_fault_handler; } |