db_trace.c revision 248124
1129198Scognet/* $NetBSD: db_trace.c,v 1.8 2003/01/17 22:28:48 thorpej Exp $ */ 2129198Scognet 3139735Simp/*- 4129198Scognet * Copyright (c) 2000, 2001 Ben Harris 5129198Scognet * Copyright (c) 1996 Scott K. Stevens 6129198Scognet * 7129198Scognet * Mach Operating System 8129198Scognet * Copyright (c) 1991,1990 Carnegie Mellon University 9129198Scognet * All Rights Reserved. 10236991Simp * 11129198Scognet * Permission to use, copy, modify and distribute this software and its 12129198Scognet * documentation is hereby granted, provided that both the copyright 13129198Scognet * notice and this permission notice appear in all copies of the 14129198Scognet * software, derivative works or modified versions, and any portions 15129198Scognet * thereof, and that both notices appear in supporting documentation. 16236991Simp * 17129198Scognet * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 18129198Scognet * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 19129198Scognet * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 20236991Simp * 21129198Scognet * Carnegie Mellon requests users of this software to return to 22236991Simp * 23129198Scognet * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 24129198Scognet * School of Computer Science 25129198Scognet * Carnegie Mellon University 26129198Scognet * Pittsburgh PA 15213-3890 27236991Simp * 28129198Scognet * any improvements or extensions that they make and grant Carnegie the 29129198Scognet * rights to redistribute these changes. 30129198Scognet */ 31129198Scognet 32129198Scognet#include <sys/cdefs.h> 33129198Scognet__FBSDID("$FreeBSD: head/sys/arm/arm/db_trace.c 248124 2013-03-10 02:40:50Z andrew $"); 34129198Scognet#include <sys/param.h> 35132402Scognet#include <sys/systm.h> 36129198Scognet 37129198Scognet 38129198Scognet#include <sys/proc.h> 39132059Scognet#include <sys/kdb.h> 40148666Sjeff#include <sys/stack.h> 41129198Scognet#include <machine/armreg.h> 42129198Scognet#include <machine/asm.h> 43129198Scognet#include <machine/cpufunc.h> 44129198Scognet#include <machine/db_machdep.h> 45138129Sdas#include <machine/pcb.h> 46174195Srwatson#include <machine/stack.h> 47129198Scognet#include <machine/vmparam.h> 48129198Scognet#include <ddb/ddb.h> 49129198Scognet#include <ddb/db_access.h> 50129198Scognet#include <ddb/db_sym.h> 51129198Scognet#include <ddb/db_output.h> 52129198Scognet 53245549Sandrew#ifdef __ARM_EABI__ 54129198Scognet/* 55245549Sandrew * Definitions for the instruction interpreter. 56245549Sandrew * 57245549Sandrew * The ARM EABI specifies how to perform the frame unwinding in the 58245549Sandrew * Exception Handling ABI for the ARM Architecture document. To perform 59245549Sandrew * the unwind we need to know the initial frame pointer, stack pointer, 60245549Sandrew * link register and program counter. We then find the entry within the 61245549Sandrew * index table that points to the function the program counter is within. 62245549Sandrew * This gives us either a list of three instructions to process, a 31-bit 63245549Sandrew * relative offset to a table of instructions, or a value telling us 64245549Sandrew * we can't unwind any further. 65245549Sandrew * 66245549Sandrew * When we have the instructions to process we need to decode them 67245549Sandrew * following table 4 in section 9.3. This describes a collection of bit 68245549Sandrew * patterns to encode that steps to take to update the stack pointer and 69245549Sandrew * link register to the correct values at the start of the function. 70245549Sandrew */ 71245549Sandrew 72245549Sandrew/* A special case when we are unable to unwind past this function */ 73245549Sandrew#define EXIDX_CANTUNWIND 1 74245549Sandrew 75245549Sandrew/* The register names */ 76245549Sandrew#define FP 11 77245549Sandrew#define SP 13 78245549Sandrew#define LR 14 79245549Sandrew#define PC 15 80245549Sandrew 81245549Sandrew/* 82245549Sandrew * These are set in the linker script. Their addresses will be 83245549Sandrew * either the start or end of the exception table or index. 84245549Sandrew */ 85245549Sandrewextern int extab_start, extab_end, exidx_start, exidx_end; 86245549Sandrew 87245549Sandrew/* 88245549Sandrew * Entry types. 89245549Sandrew * These are the only entry types that have been seen in the kernel. 90245549Sandrew */ 91245549Sandrew#define ENTRY_MASK 0xff000000 92245549Sandrew#define ENTRY_ARM_SU16 0x80000000 93245549Sandrew#define ENTRY_ARM_LU16 0x81000000 94245549Sandrew 95245549Sandrew/* Instruction masks. */ 96245549Sandrew#define INSN_VSP_MASK 0xc0 97245549Sandrew#define INSN_VSP_SIZE_MASK 0x3f 98245549Sandrew#define INSN_STD_MASK 0xf0 99245549Sandrew#define INSN_STD_DATA_MASK 0x0f 100245549Sandrew#define INSN_POP_TYPE_MASK 0x08 101245549Sandrew#define INSN_POP_COUNT_MASK 0x07 102245549Sandrew#define INSN_VSP_LARGE_INC_MASK 0xff 103245549Sandrew 104245549Sandrew/* Instruction definitions */ 105245549Sandrew#define INSN_VSP_INC 0x00 106245549Sandrew#define INSN_VSP_DEC 0x40 107245549Sandrew#define INSN_POP_MASKED 0x80 108245549Sandrew#define INSN_VSP_REG 0x90 109245549Sandrew#define INSN_POP_COUNT 0xa0 110245549Sandrew#define INSN_FINISH 0xb0 111245549Sandrew#define INSN_VSP_LARGE_INC 0xb2 112245549Sandrew 113245549Sandrew/* An item in the exception index table */ 114245549Sandrewstruct unwind_idx { 115245549Sandrew uint32_t offset; 116245549Sandrew uint32_t insn; 117245549Sandrew}; 118245549Sandrew 119245549Sandrew/* The state of the unwind process */ 120245549Sandrewstruct unwind_state { 121245549Sandrew uint32_t registers[16]; 122245549Sandrew uint32_t start_pc; 123245549Sandrew uint32_t *insn; 124245549Sandrew u_int entries; 125245549Sandrew u_int byte; 126245549Sandrew uint16_t update_mask; 127245549Sandrew}; 128245549Sandrew 129245549Sandrew/* We need to provide these but never use them */ 130245549Sandrewvoid __aeabi_unwind_cpp_pr0(void); 131245549Sandrewvoid __aeabi_unwind_cpp_pr1(void); 132245549Sandrewvoid __aeabi_unwind_cpp_pr2(void); 133245549Sandrew 134245549Sandrewvoid 135245549Sandrew__aeabi_unwind_cpp_pr0(void) 136245549Sandrew{ 137245549Sandrew panic("__aeabi_unwind_cpp_pr0"); 138245549Sandrew} 139245549Sandrew 140245549Sandrewvoid 141245549Sandrew__aeabi_unwind_cpp_pr1(void) 142245549Sandrew{ 143245549Sandrew panic("__aeabi_unwind_cpp_pr1"); 144245549Sandrew} 145245549Sandrew 146245549Sandrewvoid 147245549Sandrew__aeabi_unwind_cpp_pr2(void) 148245549Sandrew{ 149245549Sandrew panic("__aeabi_unwind_cpp_pr2"); 150245549Sandrew} 151245549Sandrew 152245549Sandrew/* Expand a 31-bit signed value to a 32-bit signed value */ 153245549Sandrewstatic __inline int32_t 154245549Sandrewdb_expand_prel31(uint32_t prel31) 155245549Sandrew{ 156245549Sandrew 157245549Sandrew return ((int32_t)(prel31 & 0x7fffffffu) << 1) / 2; 158245549Sandrew} 159245549Sandrew 160245549Sandrew/* 161245549Sandrew * Perform a binary search of the index table to find the function 162245549Sandrew * with the largest address that doesn't exceed addr. 163245549Sandrew */ 164245549Sandrewstatic struct unwind_idx * 165245549Sandrewdb_find_index(uint32_t addr) 166245549Sandrew{ 167245549Sandrew unsigned int min, mid, max; 168245549Sandrew struct unwind_idx *start; 169245549Sandrew struct unwind_idx *item; 170245549Sandrew int32_t prel31_addr; 171245549Sandrew uint32_t func_addr; 172245549Sandrew 173245549Sandrew start = (struct unwind_idx *)&exidx_start; 174245549Sandrew 175245549Sandrew min = 0; 176245549Sandrew max = (&exidx_end - &exidx_start) / 2; 177245549Sandrew 178245549Sandrew while (min != max) { 179245549Sandrew mid = min + (max - min + 1) / 2; 180245549Sandrew 181245549Sandrew item = &start[mid]; 182245549Sandrew 183245549Sandrew prel31_addr = db_expand_prel31(item->offset); 184245549Sandrew func_addr = (uint32_t)&item->offset + prel31_addr; 185245549Sandrew 186245549Sandrew if (func_addr <= addr) { 187245549Sandrew min = mid; 188245549Sandrew } else { 189245549Sandrew max = mid - 1; 190245549Sandrew } 191245549Sandrew } 192245549Sandrew 193245549Sandrew return &start[min]; 194245549Sandrew} 195245549Sandrew 196245549Sandrew/* Reads the next byte from the instruction list */ 197245549Sandrewstatic uint8_t 198245549Sandrewdb_unwind_exec_read_byte(struct unwind_state *state) 199245549Sandrew{ 200245549Sandrew uint8_t insn; 201245549Sandrew 202245549Sandrew /* Read the unwind instruction */ 203245549Sandrew insn = (*state->insn) >> (state->byte * 8); 204245549Sandrew 205245549Sandrew /* Update the location of the next instruction */ 206245549Sandrew if (state->byte == 0) { 207245549Sandrew state->byte = 3; 208245549Sandrew state->insn++; 209245549Sandrew state->entries--; 210245549Sandrew } else 211245549Sandrew state->byte--; 212245549Sandrew 213245549Sandrew return insn; 214245549Sandrew} 215245549Sandrew 216245549Sandrew/* Executes the next instruction on the list */ 217245549Sandrewstatic int 218245549Sandrewdb_unwind_exec_insn(struct unwind_state *state) 219245549Sandrew{ 220245549Sandrew unsigned int insn; 221245549Sandrew uint32_t *vsp = (uint32_t *)state->registers[SP]; 222245549Sandrew int update_vsp = 0; 223245549Sandrew 224245549Sandrew /* This should never happen */ 225245549Sandrew if (state->entries == 0) 226245549Sandrew return 1; 227245549Sandrew 228245549Sandrew /* Read the next instruction */ 229245549Sandrew insn = db_unwind_exec_read_byte(state); 230245549Sandrew 231245549Sandrew if ((insn & INSN_VSP_MASK) == INSN_VSP_INC) { 232245549Sandrew state->registers[SP] += ((insn & INSN_VSP_SIZE_MASK) << 2) + 4; 233245549Sandrew 234245549Sandrew } else if ((insn & INSN_VSP_MASK) == INSN_VSP_DEC) { 235245549Sandrew state->registers[SP] -= ((insn & INSN_VSP_SIZE_MASK) << 2) + 4; 236245549Sandrew 237245549Sandrew } else if ((insn & INSN_STD_MASK) == INSN_POP_MASKED) { 238245549Sandrew unsigned int mask, reg; 239245549Sandrew 240245549Sandrew /* Load the mask */ 241245549Sandrew mask = db_unwind_exec_read_byte(state); 242245549Sandrew mask |= (insn & INSN_STD_DATA_MASK) << 8; 243245549Sandrew 244245549Sandrew /* We have a refuse to unwind instruction */ 245245549Sandrew if (mask == 0) 246245549Sandrew return 1; 247245549Sandrew 248245549Sandrew /* Update SP */ 249245549Sandrew update_vsp = 1; 250245549Sandrew 251245549Sandrew /* Load the registers */ 252245549Sandrew for (reg = 4; mask && reg < 16; mask >>= 1, reg++) { 253245549Sandrew if (mask & 1) { 254245549Sandrew state->registers[reg] = *vsp++; 255245549Sandrew state->update_mask |= 1 << reg; 256245549Sandrew 257245549Sandrew /* If we have updated SP kep its value */ 258245549Sandrew if (reg == SP) 259245549Sandrew update_vsp = 0; 260245549Sandrew } 261245549Sandrew } 262245549Sandrew 263245549Sandrew } else if ((insn & INSN_STD_MASK) == INSN_VSP_REG && 264245549Sandrew ((insn & INSN_STD_DATA_MASK) != 13) && 265245549Sandrew ((insn & INSN_STD_DATA_MASK) != 15)) { 266245549Sandrew /* sp = register */ 267245549Sandrew state->registers[SP] = 268245549Sandrew state->registers[insn & INSN_STD_DATA_MASK]; 269245549Sandrew 270245549Sandrew } else if ((insn & INSN_STD_MASK) == INSN_POP_COUNT) { 271245549Sandrew unsigned int count, reg; 272245549Sandrew 273245549Sandrew /* Read how many registers to load */ 274245549Sandrew count = insn & INSN_POP_COUNT_MASK; 275245549Sandrew 276245549Sandrew /* Update sp */ 277245549Sandrew update_vsp = 1; 278245549Sandrew 279245549Sandrew /* Pop the registers */ 280245549Sandrew for (reg = 4; reg <= 4 + count; reg++) { 281245549Sandrew state->registers[reg] = *vsp++; 282245549Sandrew state->update_mask |= 1 << reg; 283245549Sandrew } 284245549Sandrew 285245549Sandrew /* Check if we are in the pop r14 version */ 286245549Sandrew if ((insn & INSN_POP_TYPE_MASK) != 0) { 287245549Sandrew state->registers[14] = *vsp++; 288245549Sandrew } 289245549Sandrew 290245549Sandrew } else if (insn == INSN_FINISH) { 291245549Sandrew /* Stop processing */ 292245549Sandrew state->entries = 0; 293245549Sandrew 294245549Sandrew } else if ((insn & INSN_VSP_LARGE_INC_MASK) == INSN_VSP_LARGE_INC) { 295245549Sandrew unsigned int uleb128; 296245549Sandrew 297245549Sandrew /* Read the increment value */ 298245549Sandrew uleb128 = db_unwind_exec_read_byte(state); 299245549Sandrew 300245549Sandrew state->registers[SP] += 0x204 + (uleb128 << 2); 301245549Sandrew 302245549Sandrew } else { 303245549Sandrew /* We hit a new instruction that needs to be implemented */ 304245549Sandrew db_printf("Unhandled instruction %.2x\n", insn); 305245549Sandrew return 1; 306245549Sandrew } 307245549Sandrew 308245549Sandrew if (update_vsp) { 309245549Sandrew state->registers[SP] = (uint32_t)vsp; 310245549Sandrew } 311245549Sandrew 312245549Sandrew#if 0 313245549Sandrew db_printf("fp = %08x, sp = %08x, lr = %08x, pc = %08x\n", 314245549Sandrew state->registers[FP], state->registers[SP], state->registers[LR], 315245549Sandrew state->registers[PC]); 316245549Sandrew#endif 317245549Sandrew 318245549Sandrew return 0; 319245549Sandrew} 320245549Sandrew 321245549Sandrew/* Performs the unwind of a function */ 322245549Sandrewstatic int 323245549Sandrewdb_unwind_tab(struct unwind_state *state) 324245549Sandrew{ 325245549Sandrew uint32_t entry; 326245549Sandrew 327245549Sandrew /* Set PC to a known value */ 328245549Sandrew state->registers[PC] = 0; 329245549Sandrew 330245549Sandrew /* Read the personality */ 331245549Sandrew entry = *state->insn & ENTRY_MASK; 332245549Sandrew 333245549Sandrew if (entry == ENTRY_ARM_SU16) { 334245549Sandrew state->byte = 2; 335245549Sandrew state->entries = 1; 336245549Sandrew } else if (entry == ENTRY_ARM_LU16) { 337245549Sandrew state->byte = 1; 338245549Sandrew state->entries = ((*state->insn >> 16) & 0xFF) + 1; 339245549Sandrew } else { 340245549Sandrew db_printf("Unknown entry: %x\n", entry); 341245549Sandrew return 1; 342245549Sandrew } 343245549Sandrew 344245549Sandrew while (state->entries > 0) { 345245549Sandrew if (db_unwind_exec_insn(state) != 0) 346245549Sandrew return 1; 347245549Sandrew } 348245549Sandrew 349245549Sandrew /* 350245549Sandrew * The program counter was not updated, load it from the link register. 351245549Sandrew */ 352245549Sandrew if (state->registers[PC] == 0) 353245549Sandrew state->registers[PC] = state->registers[LR]; 354245549Sandrew 355245549Sandrew return 0; 356245549Sandrew} 357245549Sandrew 358245549Sandrewstatic void 359245549Sandrewdb_stack_trace_cmd(struct unwind_state *state) 360245549Sandrew{ 361245549Sandrew struct unwind_idx *index; 362245549Sandrew const char *name; 363245549Sandrew db_expr_t value; 364245549Sandrew db_expr_t offset; 365245549Sandrew c_db_sym_t sym; 366245549Sandrew u_int reg, i; 367245549Sandrew char *sep; 368245549Sandrew 369245549Sandrew while (1) { 370245549Sandrew /* Reset the mask of updated registers */ 371245549Sandrew state->update_mask = 0; 372245549Sandrew 373245549Sandrew /* The pc value is correct and will be overwritten, save it */ 374245549Sandrew state->start_pc = state->registers[PC]; 375245549Sandrew 376245549Sandrew /* Find the item to run */ 377245549Sandrew index = db_find_index(state->start_pc); 378245549Sandrew 379245549Sandrew if (index->insn == EXIDX_CANTUNWIND) { 380245549Sandrew printf("Unable to unwind\n"); 381245549Sandrew break; 382245549Sandrew } else if (index->insn & (1 << 31)) { 383245549Sandrew /* The data is within the instruction */ 384245549Sandrew state->insn = &index->insn; 385245549Sandrew } else { 386245549Sandrew /* We have a prel31 offset to the unwind table */ 387245549Sandrew uint32_t prel31_tbl = db_expand_prel31(index->insn); 388245549Sandrew 389245549Sandrew state->insn = (uint32_t *)((uintptr_t)&index->insn + 390245549Sandrew prel31_tbl); 391245549Sandrew } 392245549Sandrew 393245549Sandrew /* Run the unwind function */ 394245549Sandrew if (db_unwind_tab(state) != 0) 395245549Sandrew break; 396245549Sandrew 397245549Sandrew /* This is not a kernel address, stop processing */ 398245549Sandrew if (state->registers[PC] < VM_MIN_KERNEL_ADDRESS) 399245549Sandrew break; 400245549Sandrew 401245549Sandrew /* Print the frame details */ 402245549Sandrew sym = db_search_symbol(state->start_pc, DB_STGY_ANY, &offset); 403245549Sandrew if (sym == C_DB_SYM_NULL) { 404245549Sandrew value = 0; 405245549Sandrew name = "(null)"; 406245549Sandrew } else 407245549Sandrew db_symbol_values(sym, &name, &value); 408245549Sandrew db_printf("%s() at ", name); 409245549Sandrew db_printsym(state->start_pc, DB_STGY_PROC); 410245549Sandrew db_printf("\n"); 411245549Sandrew db_printf("\t pc = 0x%08x lr = 0x%08x (", state->start_pc, 412245549Sandrew state->registers[LR]); 413245549Sandrew db_printsym(state->registers[LR], DB_STGY_PROC); 414245549Sandrew db_printf(")\n"); 415245549Sandrew db_printf("\t sp = 0x%08x fp = 0x%08x", 416245549Sandrew state->registers[SP], state->registers[FP]); 417245549Sandrew 418245549Sandrew /* Don't print the registers we have already printed */ 419245549Sandrew state->update_mask &= ~((1 << SP) | (1 << FP) | (1 << LR) | 420245549Sandrew (1 << PC)); 421245549Sandrew sep = "\n\t"; 422245549Sandrew for (i = 0, reg = 0; state->update_mask != 0; 423245549Sandrew state->update_mask >>= 1, reg++) { 424245549Sandrew if ((state->update_mask & 1) != 0) { 425245549Sandrew db_printf("%s%sr%d = 0x%08x", sep, 426245549Sandrew (reg < 10) ? " " : "", reg, 427245549Sandrew state->registers[reg]); 428245549Sandrew i++; 429245549Sandrew if (i == 2) { 430245549Sandrew sep = "\n\t"; 431245549Sandrew i = 0; 432245549Sandrew } else 433245549Sandrew sep = " "; 434245549Sandrew 435245549Sandrew } 436245549Sandrew } 437245549Sandrew db_printf("\n"); 438245549Sandrew } 439245549Sandrew} 440245549Sandrew#endif 441245549Sandrew 442245549Sandrew/* 443129198Scognet * APCS stack frames are awkward beasts, so I don't think even trying to use 444129198Scognet * a structure to represent them is a good idea. 445129198Scognet * 446129198Scognet * Here's the diagram from the APCS. Increasing address is _up_ the page. 447236991Simp * 448129198Scognet * save code pointer [fp] <- fp points to here 449129198Scognet * return link value [fp, #-4] 450129198Scognet * return sp value [fp, #-8] 451129198Scognet * return fp value [fp, #-12] 452129198Scognet * [saved v7 value] 453129198Scognet * [saved v6 value] 454129198Scognet * [saved v5 value] 455129198Scognet * [saved v4 value] 456129198Scognet * [saved v3 value] 457129198Scognet * [saved v2 value] 458129198Scognet * [saved v1 value] 459129198Scognet * [saved a4 value] 460129198Scognet * [saved a3 value] 461129198Scognet * [saved a2 value] 462129198Scognet * [saved a1 value] 463129198Scognet * 464236991Simp * The save code pointer points twelve bytes beyond the start of the 465236991Simp * code sequence (usually a single STM) that created the stack frame. 466236991Simp * We have to disassemble it if we want to know which of the optional 467129198Scognet * fields are actually present. 468129198Scognet */ 469129198Scognet 470245549Sandrew#ifndef __ARM_EABI__ /* The frame format is differend in AAPCS */ 471132482Smarcelstatic void 472236308Sgberdb_stack_trace_cmd(db_expr_t addr, db_expr_t count, boolean_t kernel_only) 473129198Scognet{ 474129198Scognet u_int32_t *frame, *lastframe; 475129198Scognet c_db_sym_t sym; 476129198Scognet const char *name; 477129198Scognet db_expr_t value; 478129198Scognet db_expr_t offset; 479160312Sjhb int scp_offset; 480129198Scognet 481137977Scognet frame = (u_int32_t *)addr; 482129198Scognet lastframe = NULL; 483129198Scognet scp_offset = -(get_pc_str_offset() >> 2); 484129198Scognet 485160312Sjhb while (count-- && frame != NULL && !db_pager_quit) { 486129198Scognet db_addr_t scp; 487129198Scognet u_int32_t savecode; 488129198Scognet int r; 489129198Scognet u_int32_t *rp; 490129198Scognet const char *sep; 491129198Scognet 492129198Scognet /* 493129198Scognet * In theory, the SCP isn't guaranteed to be in the function 494129198Scognet * that generated the stack frame. We hope for the best. 495129198Scognet */ 496129198Scognet scp = frame[FR_SCP]; 497129198Scognet 498135647Scognet sym = db_search_symbol(scp, DB_STGY_ANY, &offset); 499129198Scognet if (sym == C_DB_SYM_NULL) { 500129198Scognet value = 0; 501129198Scognet name = "(null)"; 502129198Scognet } else 503129198Scognet db_symbol_values(sym, &name, &value); 504129198Scognet db_printf("%s() at ", name); 505135647Scognet db_printsym(scp, DB_STGY_PROC); 506129198Scognet db_printf("\n"); 507129198Scognet#ifdef __PROG26 508129198Scognet db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV] & R15_PC); 509129198Scognet db_printsym(frame[FR_RLV] & R15_PC, DB_STGY_PROC); 510129198Scognet db_printf(")\n"); 511129198Scognet#else 512129198Scognet db_printf("scp=0x%08x rlv=0x%08x (", scp, frame[FR_RLV]); 513129198Scognet db_printsym(frame[FR_RLV], DB_STGY_PROC); 514129198Scognet db_printf(")\n"); 515129198Scognet#endif 516129198Scognet db_printf("\trsp=0x%08x rfp=0x%08x", frame[FR_RSP], frame[FR_RFP]); 517129198Scognet 518129198Scognet savecode = ((u_int32_t *)scp)[scp_offset]; 519129198Scognet if ((savecode & 0x0e100000) == 0x08000000) { 520129198Scognet /* Looks like an STM */ 521129198Scognet rp = frame - 4; 522129198Scognet sep = "\n\t"; 523129198Scognet for (r = 10; r >= 0; r--) { 524129198Scognet if (savecode & (1 << r)) { 525129198Scognet db_printf("%sr%d=0x%08x", 526129198Scognet sep, r, *rp--); 527129198Scognet sep = (frame - rp) % 4 == 2 ? 528129198Scognet "\n\t" : " "; 529129198Scognet } 530129198Scognet } 531129198Scognet } 532129198Scognet 533129198Scognet db_printf("\n"); 534129198Scognet 535129198Scognet /* 536129198Scognet * Switch to next frame up 537129198Scognet */ 538129198Scognet if (frame[FR_RFP] == 0) 539129198Scognet break; /* Top of stack */ 540129198Scognet 541129198Scognet lastframe = frame; 542129198Scognet frame = (u_int32_t *)(frame[FR_RFP]); 543129198Scognet 544129198Scognet if (INKERNEL((int)frame)) { 545129198Scognet /* staying in kernel */ 546129198Scognet if (frame <= lastframe) { 547129198Scognet db_printf("Bad frame pointer: %p\n", frame); 548129198Scognet break; 549129198Scognet } 550129198Scognet } else if (INKERNEL((int)lastframe)) { 551129198Scognet /* switch from user to kernel */ 552129198Scognet if (kernel_only) 553129198Scognet break; /* kernel stack only */ 554129198Scognet } else { 555129198Scognet /* in user */ 556129198Scognet if (frame <= lastframe) { 557129198Scognet db_printf("Bad user frame pointer: %p\n", 558129198Scognet frame); 559129198Scognet break; 560129198Scognet } 561129198Scognet } 562129198Scognet } 563129198Scognet} 564245549Sandrew#endif 565129198Scognet 566129198Scognet/* XXX stubs */ 567129198Scognetvoid 568129198Scognetdb_md_list_watchpoints() 569129198Scognet{ 570129198Scognet} 571129198Scognet 572129198Scognetint 573129198Scognetdb_md_clr_watchpoint(db_expr_t addr, db_expr_t size) 574129198Scognet{ 575129198Scognet return (0); 576129198Scognet} 577129198Scognet 578129198Scognetint 579129198Scognetdb_md_set_watchpoint(db_expr_t addr, db_expr_t size) 580129198Scognet{ 581129198Scognet return (0); 582129198Scognet} 583132482Smarcel 584132059Scognetint 585132059Scognetdb_trace_thread(struct thread *thr, int count) 586129198Scognet{ 587245549Sandrew#ifdef __ARM_EABI__ 588245549Sandrew struct unwind_state state; 589245549Sandrew#endif 590198943Smarcel struct pcb *ctx; 591129198Scognet 592236308Sgber if (thr != curthread) { 593236308Sgber ctx = kdb_thr_ctx(thr); 594245549Sandrew 595245549Sandrew#ifdef __ARM_EABI__ 596245549Sandrew state.registers[FP] = ctx->un_32.pcb32_r11; 597245549Sandrew state.registers[SP] = ctx->un_32.pcb32_sp; 598245549Sandrew state.registers[LR] = ctx->un_32.pcb32_lr; 599245549Sandrew state.registers[PC] = ctx->un_32.pcb32_pc; 600245549Sandrew 601245549Sandrew db_stack_trace_cmd(&state); 602245549Sandrew#else 603236308Sgber db_stack_trace_cmd(ctx->un_32.pcb32_r11, -1, TRUE); 604245549Sandrew#endif 605236308Sgber } else 606236308Sgber db_trace_self(); 607132059Scognet return (0); 608129198Scognet} 609132059Scognet 610132059Scognetvoid 611132059Scognetdb_trace_self(void) 612132059Scognet{ 613245549Sandrew#ifdef __ARM_EABI__ 614245549Sandrew struct unwind_state state; 615248124Sandrew uint32_t sp; 616245549Sandrew 617248124Sandrew /* Read the stack pointer */ 618248124Sandrew __asm __volatile("mov %0, sp" : "=&r" (sp)); 619248124Sandrew 620245549Sandrew state.registers[FP] = (uint32_t)__builtin_frame_address(0); 621248124Sandrew state.registers[SP] = sp; 622245549Sandrew state.registers[LR] = (uint32_t)__builtin_return_address(0); 623245549Sandrew state.registers[PC] = (uint32_t)db_trace_self; 624245549Sandrew 625245549Sandrew db_stack_trace_cmd(&state); 626245549Sandrew#else 627198942Smarcel db_addr_t addr; 628198942Smarcel 629203171Smarcel addr = (db_addr_t)__builtin_frame_address(0); 630236308Sgber db_stack_trace_cmd(addr, -1, FALSE); 631245549Sandrew#endif 632132059Scognet} 633