| 1 | /* Copyright (C) 1988, 1989 Free Software Foundation, Inc. |
| 2 | |
| 3 | This file is part of GDB. |
| 4 | |
| 5 | GDB is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 1, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | GDB is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with GDB; see the file COPYING. If not, write to |
| 17 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 18 | |
| 19 | #include "defs.h" |
| 20 | #include "param.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "arm-opcode.h" |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <sys/param.h> |
| 27 | #include <sys/dir.h> |
| 28 | #include <signal.h> |
| 29 | #include <sys/ioctl.h> |
| 30 | #include <sys/ptrace.h> |
| 31 | #include <machine/reg.h> |
| 32 | |
| 33 | #define N_TXTADDR(hdr) 0x8000 |
| 34 | #define N_DATADDR(hdr) (hdr.a_text + 0x8000) |
| 35 | |
| 36 | #include "gdbcore.h" |
| 37 | #include <sys/user.h> /* After a.out.h */ |
| 38 | #include <sys/file.h> |
| 39 | #include <sys/stat.h> |
| 40 | |
| 41 | #include <errno.h> |
| 42 | |
| 43 | \f |
| 44 | /* Work with core dump and executable files, for GDB. |
| 45 | This code would be in core.c if it weren't machine-dependent. */ |
| 46 | |
| 47 | /* Structure to describe the chain of shared libraries used |
| 48 | by the execfile. |
| 49 | e.g. prog shares Xt which shares X11 which shares c. */ |
| 50 | |
| 51 | struct shared_library { |
| 52 | struct exec_header header; |
| 53 | char name[SHLIBLEN]; |
| 54 | CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */ |
| 55 | long data_offset; /* offset of data section in file */ |
| 56 | int chan; /* file descriptor for the file */ |
| 57 | struct shared_library *shares; /* library this one shares */ |
| 58 | }; |
| 59 | static struct shared_library *shlib = 0; |
| 60 | |
| 61 | /* Hook for `exec_file_command' command to call. */ |
| 62 | |
| 63 | extern void (*exec_file_display_hook) (); |
| 64 | |
| 65 | static CORE_ADDR unshared_text_start; |
| 66 | |
| 67 | /* extended header from exec file (for shared library info) */ |
| 68 | |
| 69 | static struct exec_header exec_header; |
| 70 | |
| 71 | void |
| 72 | exec_file_command (filename, from_tty) |
| 73 | char *filename; |
| 74 | int from_tty; |
| 75 | { |
| 76 | int val; |
| 77 | |
| 78 | /* Eliminate all traces of old exec file. |
| 79 | Mark text segment as empty. */ |
| 80 | |
| 81 | if (execfile) |
| 82 | free (execfile); |
| 83 | execfile = 0; |
| 84 | data_start = 0; |
| 85 | data_end -= exec_data_start; |
| 86 | text_start = 0; |
| 87 | unshared_text_start = 0; |
| 88 | text_end = 0; |
| 89 | exec_data_start = 0; |
| 90 | exec_data_end = 0; |
| 91 | if (execchan >= 0) |
| 92 | close (execchan); |
| 93 | execchan = -1; |
| 94 | if (shlib) { |
| 95 | close_shared_library(shlib); |
| 96 | shlib = 0; |
| 97 | } |
| 98 | |
| 99 | /* Now open and digest the file the user requested, if any. */ |
| 100 | |
| 101 | if (filename) |
| 102 | { |
| 103 | filename = tilde_expand (filename); |
| 104 | make_cleanup (free, filename); |
| 105 | |
| 106 | execchan = openp (getenv ("PATH"), 1, filename, O_RDONLY, 0, |
| 107 | &execfile); |
| 108 | if (execchan < 0) |
| 109 | perror_with_name (filename); |
| 110 | |
| 111 | { |
| 112 | struct stat st_exec; |
| 113 | |
| 114 | #ifdef HEADER_SEEK_FD |
| 115 | HEADER_SEEK_FD (execchan); |
| 116 | #endif |
| 117 | |
| 118 | val = myread (execchan, &exec_header, sizeof exec_header); |
| 119 | exec_aouthdr = exec_header.a_exec; |
| 120 | |
| 121 | if (val < 0) |
| 122 | perror_with_name (filename); |
| 123 | |
| 124 | text_start = 0x8000; |
| 125 | |
| 126 | /* Look for shared library if needed */ |
| 127 | if (exec_header.a_exec.a_magic & MF_USES_SL) |
| 128 | shlib = open_shared_library(exec_header.a_shlibname, text_start); |
| 129 | |
| 130 | text_offset = N_TXTOFF (exec_aouthdr); |
| 131 | exec_data_offset = N_TXTOFF (exec_aouthdr) + exec_aouthdr.a_text; |
| 132 | |
| 133 | if (shlib) { |
| 134 | unshared_text_start = shared_text_end(shlib) & ~0x7fff; |
| 135 | stack_start = shlib->header.a_exec.a_sldatabase; |
| 136 | stack_end = STACK_END_ADDR; |
| 137 | } else |
| 138 | unshared_text_start = 0x8000; |
| 139 | text_end = unshared_text_start + exec_aouthdr.a_text; |
| 140 | |
| 141 | exec_data_start = unshared_text_start + exec_aouthdr.a_text; |
| 142 | exec_data_end = exec_data_start + exec_aouthdr.a_data; |
| 143 | |
| 144 | data_start = exec_data_start; |
| 145 | data_end += exec_data_start; |
| 146 | |
| 147 | fstat (execchan, &st_exec); |
| 148 | exec_mtime = st_exec.st_mtime; |
| 149 | } |
| 150 | |
| 151 | validate_files (); |
| 152 | } |
| 153 | else if (from_tty) |
| 154 | printf ("No exec file now.\n"); |
| 155 | |
| 156 | /* Tell display code (if any) about the changed file name. */ |
| 157 | if (exec_file_display_hook) |
| 158 | (*exec_file_display_hook) (filename); |
| 159 | } |
| 160 | |
| 161 | /* Read from the program's memory (except for inferior processes). |
| 162 | This function is misnamed, since it only reads, never writes; and |
| 163 | since it will use the core file and/or executable file as necessary. |
| 164 | |
| 165 | It should be extended to write as well as read, FIXME, for patching files. |
| 166 | |
| 167 | Return 0 if address could be read, EIO if addresss out of bounds. */ |
| 168 | |
| 169 | int |
| 170 | xfer_core_file (memaddr, myaddr, len) |
| 171 | CORE_ADDR memaddr; |
| 172 | char *myaddr; |
| 173 | int len; |
| 174 | { |
| 175 | register int i; |
| 176 | register int val; |
| 177 | int xferchan; |
| 178 | char **xferfile; |
| 179 | int fileptr; |
| 180 | int returnval = 0; |
| 181 | |
| 182 | while (len > 0) |
| 183 | { |
| 184 | xferfile = 0; |
| 185 | xferchan = 0; |
| 186 | |
| 187 | /* Determine which file the next bunch of addresses reside in, |
| 188 | and where in the file. Set the file's read/write pointer |
| 189 | to point at the proper place for the desired address |
| 190 | and set xferfile and xferchan for the correct file. |
| 191 | |
| 192 | If desired address is nonexistent, leave them zero. |
| 193 | |
| 194 | i is set to the number of bytes that can be handled |
| 195 | along with the next address. |
| 196 | |
| 197 | We put the most likely tests first for efficiency. */ |
| 198 | |
| 199 | /* Note that if there is no core file |
| 200 | data_start and data_end are equal. */ |
| 201 | if (memaddr >= data_start && memaddr < data_end) |
| 202 | { |
| 203 | i = min (len, data_end - memaddr); |
| 204 | fileptr = memaddr - data_start + data_offset; |
| 205 | xferfile = &corefile; |
| 206 | xferchan = corechan; |
| 207 | } |
| 208 | /* Note that if there is no core file |
| 209 | stack_start and stack_end define the shared library data. */ |
| 210 | else if (memaddr >= stack_start && memaddr < stack_end) |
| 211 | { |
| 212 | if (corechan < 0) { |
| 213 | struct shared_library *lib; |
| 214 | for (lib = shlib; lib; lib = lib->shares) |
| 215 | if (memaddr >= lib->header.a_exec.a_sldatabase && |
| 216 | memaddr < lib->header.a_exec.a_sldatabase + |
| 217 | lib->header.a_exec.a_data) |
| 218 | break; |
| 219 | if (lib) { |
| 220 | i = min (len, lib->header.a_exec.a_sldatabase + |
| 221 | lib->header.a_exec.a_data - memaddr); |
| 222 | fileptr = lib->data_offset + memaddr - |
| 223 | lib->header.a_exec.a_sldatabase; |
| 224 | xferfile = execfile; |
| 225 | xferchan = lib->chan; |
| 226 | } |
| 227 | } else { |
| 228 | i = min (len, stack_end - memaddr); |
| 229 | fileptr = memaddr - stack_start + stack_offset; |
| 230 | xferfile = &corefile; |
| 231 | xferchan = corechan; |
| 232 | } |
| 233 | } |
| 234 | else if (corechan < 0 |
| 235 | && memaddr >= exec_data_start && memaddr < exec_data_end) |
| 236 | { |
| 237 | i = min (len, exec_data_end - memaddr); |
| 238 | fileptr = memaddr - exec_data_start + exec_data_offset; |
| 239 | xferfile = &execfile; |
| 240 | xferchan = execchan; |
| 241 | } |
| 242 | else if (memaddr >= text_start && memaddr < text_end) |
| 243 | { |
| 244 | struct shared_library *lib; |
| 245 | for (lib = shlib; lib; lib = lib->shares) |
| 246 | if (memaddr >= lib->text_start && |
| 247 | memaddr < lib->text_start + lib->header.a_exec.a_text) |
| 248 | break; |
| 249 | if (lib) { |
| 250 | i = min (len, lib->header.a_exec.a_text + |
| 251 | lib->text_start - memaddr); |
| 252 | fileptr = memaddr - lib->text_start + text_offset; |
| 253 | xferfile = &execfile; |
| 254 | xferchan = lib->chan; |
| 255 | } else { |
| 256 | i = min (len, text_end - memaddr); |
| 257 | fileptr = memaddr - unshared_text_start + text_offset; |
| 258 | xferfile = &execfile; |
| 259 | xferchan = execchan; |
| 260 | } |
| 261 | } |
| 262 | else if (memaddr < text_start) |
| 263 | { |
| 264 | i = min (len, text_start - memaddr); |
| 265 | } |
| 266 | else if (memaddr >= text_end |
| 267 | && memaddr < (corechan >= 0? data_start : exec_data_start)) |
| 268 | { |
| 269 | i = min (len, data_start - memaddr); |
| 270 | } |
| 271 | else if (corechan >= 0 |
| 272 | && memaddr >= data_end && memaddr < stack_start) |
| 273 | { |
| 274 | i = min (len, stack_start - memaddr); |
| 275 | } |
| 276 | else if (corechan < 0 && memaddr >= exec_data_end) |
| 277 | { |
| 278 | i = min (len, - memaddr); |
| 279 | } |
| 280 | else if (memaddr >= stack_end && stack_end != 0) |
| 281 | { |
| 282 | i = min (len, - memaddr); |
| 283 | } |
| 284 | else |
| 285 | { |
| 286 | /* Address did not classify into one of the known ranges. |
| 287 | This shouldn't happen; we catch the endpoints. */ |
| 288 | fatal ("Internal: Bad case logic in xfer_core_file."); |
| 289 | } |
| 290 | |
| 291 | /* Now we know which file to use. |
| 292 | Set up its pointer and transfer the data. */ |
| 293 | if (xferfile) |
| 294 | { |
| 295 | if (*xferfile == 0) |
| 296 | if (xferfile == &execfile) |
| 297 | error ("No program file to examine."); |
| 298 | else |
| 299 | error ("No core dump file or running program to examine."); |
| 300 | val = lseek (xferchan, fileptr, 0); |
| 301 | if (val < 0) |
| 302 | perror_with_name (*xferfile); |
| 303 | val = myread (xferchan, myaddr, i); |
| 304 | if (val < 0) |
| 305 | perror_with_name (*xferfile); |
| 306 | } |
| 307 | /* If this address is for nonexistent memory, |
| 308 | read zeros if reading, or do nothing if writing. |
| 309 | Actually, we never right. */ |
| 310 | else |
| 311 | { |
| 312 | bzero (myaddr, i); |
| 313 | returnval = EIO; |
| 314 | } |
| 315 | |
| 316 | memaddr += i; |
| 317 | myaddr += i; |
| 318 | len -= i; |
| 319 | } |
| 320 | return returnval; |
| 321 | } |
| 322 | \f |
| 323 | /* APCS (ARM procedure call standard) defines the following prologue: |
| 324 | |
| 325 | mov ip, sp |
| 326 | [stmfd sp!, {a1,a2,a3,a4}] |
| 327 | stmfd sp!, {...,fp,ip,lr,pc} |
| 328 | [stfe f7, [sp, #-12]!] |
| 329 | [stfe f6, [sp, #-12]!] |
| 330 | [stfe f5, [sp, #-12]!] |
| 331 | [stfe f4, [sp, #-12]!] |
| 332 | sub fp, ip, #nn // nn == 20 or 4 depending on second ins |
| 333 | */ |
| 334 | |
| 335 | CORE_ADDR |
| 336 | skip_prologue(pc) |
| 337 | CORE_ADDR pc; |
| 338 | { |
| 339 | union insn_fmt op; |
| 340 | CORE_ADDR skip_pc = pc; |
| 341 | |
| 342 | op.ins = read_memory_integer(skip_pc, 4); |
| 343 | /* look for the "mov ip,sp" */ |
| 344 | if (op.generic.type != TYPE_ARITHMETIC || |
| 345 | op.arith.opcode != OPCODE_MOV || |
| 346 | op.arith.dest != SPTEMP || |
| 347 | op.arith.operand2 != SP) return pc; |
| 348 | skip_pc += 4; |
| 349 | /* skip the "stmfd sp!,{a1,a2,a3,a4}" if its there */ |
| 350 | op.ins = read_memory_integer(skip_pc, 4); |
| 351 | if (op.generic.type == TYPE_BLOCK_BRANCH && |
| 352 | op.generic.subtype == SUBTYPE_BLOCK && |
| 353 | op.block.mask == 0xf && |
| 354 | op.block.base == SP && |
| 355 | op.block.is_load == 0 && |
| 356 | op.block.writeback == 1 && |
| 357 | op.block.increment == 0 && |
| 358 | op.block.before == 1) skip_pc += 4; |
| 359 | /* skip the "stmfd sp!,{...,fp,ip,lr,pc} */ |
| 360 | op.ins = read_memory_integer(skip_pc, 4); |
| 361 | if (op.generic.type != TYPE_BLOCK_BRANCH || |
| 362 | op.generic.subtype != SUBTYPE_BLOCK || |
| 363 | /* the mask should look like 110110xxxxxx0000 */ |
| 364 | (op.block.mask & 0xd800) != 0xd800 || |
| 365 | op.block.base != SP || |
| 366 | op.block.is_load != 0 || |
| 367 | op.block.writeback != 1 || |
| 368 | op.block.increment != 0 || |
| 369 | op.block.before != 1) return pc; |
| 370 | skip_pc += 4; |
| 371 | /* check for "sub fp,ip,#nn" */ |
| 372 | op.ins = read_memory_integer(skip_pc, 4); |
| 373 | if (op.generic.type != TYPE_ARITHMETIC || |
| 374 | op.arith.opcode != OPCODE_SUB || |
| 375 | op.arith.dest != FP || |
| 376 | op.arith.operand1 != SPTEMP) return pc; |
| 377 | return skip_pc + 4; |
| 378 | } |
| 379 | |
| 380 | static void |
| 381 | print_fpu_flags(flags) |
| 382 | int flags; |
| 383 | { |
| 384 | if (flags & (1 << 0)) fputs("IVO ", stdout); |
| 385 | if (flags & (1 << 1)) fputs("DVZ ", stdout); |
| 386 | if (flags & (1 << 2)) fputs("OFL ", stdout); |
| 387 | if (flags & (1 << 3)) fputs("UFL ", stdout); |
| 388 | if (flags & (1 << 4)) fputs("INX ", stdout); |
| 389 | putchar('\n'); |
| 390 | } |
| 391 | |
| 392 | void |
| 393 | arm_float_info() |
| 394 | { |
| 395 | register unsigned long status = read_register(FPS_REGNUM); |
| 396 | int type; |
| 397 | |
| 398 | type = (status >> 24) & 127; |
| 399 | printf("%s FPU type %d\n", |
| 400 | (status & (1<<31)) ? "Hardware" : "Software", |
| 401 | type); |
| 402 | fputs("mask: ", stdout); |
| 403 | print_fpu_flags(status >> 16); |
| 404 | fputs("flags: ", stdout); |
| 405 | print_fpu_flags(status); |
| 406 | } |