projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* gdb-stub.c: FRV GDB stub |
| 2 | * | |
| 3 | * Copyright (C) 2003,4 Red Hat, Inc. All Rights Reserved. | |
| 4 | * Written by David Howells (dhowells@redhat.com) | |
| 5 | * - Derived from Linux/MIPS version, Copyright (C) 1995 Andreas Busse | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or | |
| 8 | * modify it under the terms of the GNU General Public License | |
| 9 | * as published by the Free Software Foundation; either version | |
| 10 | * 2 of the License, or (at your option) any later version. | |
| 11 | */ | |
| 12 | ||
| 13 | /* | |
| 14 | * To enable debugger support, two things need to happen. One, a | |
| 15 | * call to set_debug_traps() is necessary in order to allow any breakpoints | |
| 16 | * or error conditions to be properly intercepted and reported to gdb. | |
| 17 | * Two, a breakpoint needs to be generated to begin communication. This | |
| 18 | * is most easily accomplished by a call to breakpoint(). Breakpoint() | |
| 19 | * simulates a breakpoint by executing a BREAK instruction. | |
| 20 | * | |
| 21 | * | |
| 22 | * The following gdb commands are supported: | |
| 23 | * | |
| 24 | * command function Return value | |
| 25 | * | |
| 26 | * g return the value of the CPU registers hex data or ENN | |
| 27 | * G set the value of the CPU registers OK or ENN | |
| 28 | * | |
| 29 | * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN | |
| 30 | * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN | |
| 31 | * | |
| 32 | * c Resume at current address SNN ( signal NN) | |
| 33 | * cAA..AA Continue at address AA..AA SNN | |
| 34 | * | |
| 35 | * s Step one instruction SNN | |
| 36 | * sAA..AA Step one instruction from AA..AA SNN | |
| 37 | * | |
| 38 | * k kill | |
| 39 | * | |
| 40 | * ? What was the last sigval ? SNN (signal NN) | |
| 41 | * | |
| 42 | * bBB..BB Set baud rate to BB..BB OK or BNN, then sets | |
| 43 | * baud rate | |
| 44 | * | |
| 45 | * All commands and responses are sent with a packet which includes a | |
| 46 | * checksum. A packet consists of | |
| 47 | * | |
| 48 | * $<packet info>#<checksum>. | |
| 49 | * | |
| 50 | * where | |
| 51 | * <packet info> :: <characters representing the command or response> | |
| 52 | * <checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>> | |
| 53 | * | |
| 54 | * When a packet is received, it is first acknowledged with either '+' or '-'. | |
| 55 | * '+' indicates a successful transfer. '-' indicates a failed transfer. | |
| 56 | * | |
| 57 | * Example: | |
| 58 | * | |
| 59 | * Host: Reply: | |
| 60 | * $m0,10#2a +$00010203040506070809101112131415#42 | |
| 61 | * | |
| 62 | * | |
| 63 | * ============== | |
| 64 | * MORE EXAMPLES: | |
| 65 | * ============== | |
| 66 | * | |
| 67 | * For reference -- the following are the steps that one | |
| 68 | * company took (RidgeRun Inc) to get remote gdb debugging | |
| 69 | * going. In this scenario the host machine was a PC and the | |
| 70 | * target platform was a Galileo EVB64120A MIPS evaluation | |
| 71 | * board. | |
| 72 | * | |
| 73 | * Step 1: | |
| 74 | * First download gdb-5.0.tar.gz from the internet. | |
| 75 | * and then build/install the package. | |
| 76 | * | |
| 77 | * Example: | |
| 78 | * $ tar zxf gdb-5.0.tar.gz | |
| 79 | * $ cd gdb-5.0 | |
| 80 | * $ ./configure --target=frv-elf-gdb | |
| 81 | * $ make | |
| 82 | * $ frv-elf-gdb | |
| 83 | * | |
| 84 | * Step 2: | |
| 85 | * Configure linux for remote debugging and build it. | |
| 86 | * | |
| 87 | * Example: | |
| 88 | * $ cd ~/linux | |
| 89 | * $ make menuconfig <go to "Kernel Hacking" and turn on remote debugging> | |
| d3883ece | 90 | * $ make vmlinux |
| 1da177e4 LT |
91 | * |
| 92 | * Step 3: | |
| 93 | * Download the kernel to the remote target and start | |
| 94 | * the kernel running. It will promptly halt and wait | |
| 95 | * for the host gdb session to connect. It does this | |
| 96 | * since the "Kernel Hacking" option has defined | |
| 97 | * CONFIG_REMOTE_DEBUG which in turn enables your calls | |
| 98 | * to: | |
| 99 | * set_debug_traps(); | |
| 100 | * breakpoint(); | |
| 101 | * | |
| 102 | * Step 4: | |
| 103 | * Start the gdb session on the host. | |
| 104 | * | |
| 105 | * Example: | |
| 106 | * $ frv-elf-gdb vmlinux | |
| 107 | * (gdb) set remotebaud 115200 | |
| 108 | * (gdb) target remote /dev/ttyS1 | |
| 109 | * ...at this point you are connected to | |
| 110 | * the remote target and can use gdb | |
| 111 | * in the normal fasion. Setting | |
| 112 | * breakpoints, single stepping, | |
| 113 | * printing variables, etc. | |
| 114 | * | |
| 115 | */ | |
| 116 | ||
| 117 | #include <linux/string.h> | |
| 118 | #include <linux/kernel.h> | |
| 119 | #include <linux/signal.h> | |
| 120 | #include <linux/sched.h> | |
| 121 | #include <linux/mm.h> | |
| 122 | #include <linux/console.h> | |
| 123 | #include <linux/init.h> | |
| 124 | #include <linux/slab.h> | |
| 125 | #include <linux/nmi.h> | |
| 126 | ||
| 84e8cd6d | 127 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
128 | #include <asm/pgtable.h> |
| 129 | #include <asm/system.h> | |
| 130 | #include <asm/gdb-stub.h> | |
| 131 | ||
| 132 | #define LEDS(x) do { /* *(u32*)0xe1200004 = ~(x); mb(); */ } while(0) | |
| 133 | ||
| 134 | #undef GDBSTUB_DEBUG_PROTOCOL | |
| 135 | ||
| 136 | extern void debug_to_serial(const char *p, int n); | |
| 137 | extern void gdbstub_console_write(struct console *co, const char *p, unsigned n); | |
| 138 | ||
| 139 | extern volatile uint32_t __break_error_detect[3]; /* ESFR1, ESR15, EAR15 */ | |
| 1da177e4 LT |
140 | |
| 141 | struct __debug_amr { | |
| 142 | unsigned long L, P; | |
| 143 | } __attribute__((aligned(8))); | |
| 144 | ||
| 145 | struct __debug_mmu { | |
| 146 | struct { | |
| 147 | unsigned long hsr0, pcsr, esr0, ear0, epcr0; | |
| 148 | #ifdef CONFIG_MMU | |
| 149 | unsigned long tplr, tppr, tpxr, cxnr; | |
| 150 | #endif | |
| 151 | } regs; | |
| 152 | ||
| 153 | struct __debug_amr iamr[16]; | |
| 154 | struct __debug_amr damr[16]; | |
| 155 | ||
| 156 | #ifdef CONFIG_MMU | |
| 157 | struct __debug_amr tlb[64*2]; | |
| 158 | #endif | |
| 159 | }; | |
| 160 | ||
| 161 | static struct __debug_mmu __debug_mmu; | |
| 162 | ||
| 163 | /* | |
| 164 | * BUFMAX defines the maximum number of characters in inbound/outbound buffers | |
| 165 | * at least NUMREGBYTES*2 are needed for register packets | |
| 166 | */ | |
| 167 | #define BUFMAX 2048 | |
| 168 | ||
| 169 | #define BREAK_INSN 0x801000c0 /* use "break" as bkpt */ | |
| 170 | ||
| 171 | static const char gdbstub_banner[] = "Linux/FR-V GDB Stub (c) RedHat 2003\n"; | |
| 172 | ||
| 173 | volatile u8 gdbstub_rx_buffer[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); | |
| 174 | volatile u32 gdbstub_rx_inp = 0; | |
| 175 | volatile u32 gdbstub_rx_outp = 0; | |
| 176 | volatile u8 gdbstub_rx_overflow = 0; | |
| 177 | u8 gdbstub_rx_unget = 0; | |
| 178 | ||
| 179 | /* set with GDB whilst running to permit step through exceptions */ | |
| 180 | extern volatile u32 __attribute__((section(".bss"))) gdbstub_trace_through_exceptions; | |
| 181 | ||
| 182 | static char input_buffer[BUFMAX]; | |
| 183 | static char output_buffer[BUFMAX]; | |
| 184 | ||
| 1da177e4 LT |
185 | static const char *regnames[] = { |
| 186 | "PSR ", "ISR ", "CCR ", "CCCR", | |
| 187 | "LR ", "LCR ", "PC ", "_stt", | |
| 188 | "sys ", "GR8*", "GNE0", "GNE1", | |
| 189 | "IACH", "IACL", | |
| 190 | "TBR ", "SP ", "FP ", "GR3 ", | |
| 191 | "GR4 ", "GR5 ", "GR6 ", "GR7 ", | |
| 192 | "GR8 ", "GR9 ", "GR10", "GR11", | |
| 193 | "GR12", "GR13", "GR14", "GR15", | |
| 194 | "GR16", "GR17", "GR18", "GR19", | |
| 195 | "GR20", "GR21", "GR22", "GR23", | |
| 196 | "GR24", "GR25", "GR26", "GR27", | |
| 197 | "EFRM", "CURR", "GR30", "BFRM" | |
| 198 | }; | |
| 199 | ||
| 200 | struct gdbstub_bkpt { | |
| 201 | unsigned long addr; /* address of breakpoint */ | |
| 202 | unsigned len; /* size of breakpoint */ | |
| 203 | uint32_t originsns[7]; /* original instructions */ | |
| 204 | }; | |
| 205 | ||
| 206 | static struct gdbstub_bkpt gdbstub_bkpts[256]; | |
| 207 | ||
| 208 | /* | |
| 209 | * local prototypes | |
| 210 | */ | |
| 211 | ||
| 212 | static void gdbstub_recv_packet(char *buffer); | |
| 213 | static int gdbstub_send_packet(char *buffer); | |
| 214 | static int gdbstub_compute_signal(unsigned long tbr); | |
| 215 | static int hex(unsigned char ch); | |
| 216 | static int hexToInt(char **ptr, unsigned long *intValue); | |
| 217 | static unsigned char *mem2hex(const void *mem, char *buf, int count, int may_fault); | |
| 218 | static char *hex2mem(const char *buf, void *_mem, int count); | |
| 219 | ||
| 220 | /* | |
| 221 | * Convert ch from a hex digit to an int | |
| 222 | */ | |
| 223 | static int hex(unsigned char ch) | |
| 224 | { | |
| 225 | if (ch >= 'a' && ch <= 'f') | |
| 226 | return ch-'a'+10; | |
| 227 | if (ch >= '0' && ch <= '9') | |
| 228 | return ch-'0'; | |
| 229 | if (ch >= 'A' && ch <= 'F') | |
| 230 | return ch-'A'+10; | |
| 231 | return -1; | |
| 232 | } | |
| 233 | ||
| 234 | void gdbstub_printk(const char *fmt, ...) | |
| 235 | { | |
| 236 | static char buf[1024]; | |
| 237 | va_list args; | |
| 238 | int len; | |
| 239 | ||
| 240 | /* Emit the output into the temporary buffer */ | |
| 241 | va_start(args, fmt); | |
| 242 | len = vsnprintf(buf, sizeof(buf), fmt, args); | |
| 243 | va_end(args); | |
| 244 | debug_to_serial(buf, len); | |
| 245 | } | |
| 246 | ||
| 247 | static inline char *gdbstub_strcpy(char *dst, const char *src) | |
| 248 | { | |
| 249 | int loop = 0; | |
| 250 | while ((dst[loop] = src[loop])) | |
| 251 | loop++; | |
| 252 | return dst; | |
| 253 | } | |
| 254 | ||
| 255 | static void gdbstub_purge_cache(void) | |
| 256 | { | |
| 257 | asm volatile(" dcef @(gr0,gr0),#1 \n" | |
| 258 | " icei @(gr0,gr0),#1 \n" | |
| 259 | " membar \n" | |
| 260 | " bar \n" | |
| 261 | ); | |
| 262 | } | |
| 263 | ||
| 264 | /*****************************************************************************/ | |
| 265 | /* | |
| 266 | * scan for the sequence $<data>#<checksum> | |
| 267 | */ | |
| 268 | static void gdbstub_recv_packet(char *buffer) | |
| 269 | { | |
| 270 | unsigned char checksum; | |
| 271 | unsigned char xmitcsum; | |
| 272 | unsigned char ch; | |
| 273 | int count, i, ret, error; | |
| 274 | ||
| 275 | for (;;) { | |
| 276 | /* wait around for the start character, ignore all other characters */ | |
| 277 | do { | |
| 278 | gdbstub_rx_char(&ch, 0); | |
| 279 | } while (ch != '$'); | |
| 280 | ||
| 281 | checksum = 0; | |
| 282 | xmitcsum = -1; | |
| 283 | count = 0; | |
| 284 | error = 0; | |
| 285 | ||
| 286 | /* now, read until a # or end of buffer is found */ | |
| 287 | while (count < BUFMAX) { | |
| 288 | ret = gdbstub_rx_char(&ch, 0); | |
| 289 | if (ret < 0) | |
| 290 | error = ret; | |
| 291 | ||
| 292 | if (ch == '#') | |
| 293 | break; | |
| 294 | checksum += ch; | |
| 295 | buffer[count] = ch; | |
| 296 | count++; | |
| 297 | } | |
| 298 | ||
| 299 | if (error == -EIO) { | |
| 300 | gdbstub_proto("### GDB Rx Error - Skipping packet ###\n"); | |
| 301 | gdbstub_proto("### GDB Tx NAK\n"); | |
| 302 | gdbstub_tx_char('-'); | |
| 303 | continue; | |
| 304 | } | |
| 305 | ||
| 306 | if (count >= BUFMAX || error) | |
| 307 | continue; | |
| 308 | ||
| 309 | buffer[count] = 0; | |
| 310 | ||
| 311 | /* read the checksum */ | |
| 312 | ret = gdbstub_rx_char(&ch, 0); | |
| 313 | if (ret < 0) | |
| 314 | error = ret; | |
| 315 | xmitcsum = hex(ch) << 4; | |
| 316 | ||
| 317 | ret = gdbstub_rx_char(&ch, 0); | |
| 318 | if (ret < 0) | |
| 319 | error = ret; | |
| 320 | xmitcsum |= hex(ch); | |
| 321 | ||
| 322 | if (error) { | |
| 323 | if (error == -EIO) | |
| 324 | gdbstub_proto("### GDB Rx Error - Skipping packet\n"); | |
| 325 | gdbstub_proto("### GDB Tx NAK\n"); | |
| 326 | gdbstub_tx_char('-'); | |
| 327 | continue; | |
| 328 | } | |
| 329 | ||
| 330 | /* check the checksum */ | |
| 331 | if (checksum != xmitcsum) { | |
| 332 | gdbstub_proto("### GDB Tx NAK\n"); | |
| 333 | gdbstub_tx_char('-'); /* failed checksum */ | |
| 334 | continue; | |
| 335 | } | |
| 336 | ||
| 337 | gdbstub_proto("### GDB Rx '$%s#%02x' ###\n", buffer, checksum); | |
| 338 | gdbstub_proto("### GDB Tx ACK\n"); | |
| 339 | gdbstub_tx_char('+'); /* successful transfer */ | |
| 340 | ||
| 341 | /* if a sequence char is present, reply the sequence ID */ | |
| 342 | if (buffer[2] == ':') { | |
| 343 | gdbstub_tx_char(buffer[0]); | |
| 344 | gdbstub_tx_char(buffer[1]); | |
| 345 | ||
| 346 | /* remove sequence chars from buffer */ | |
| 347 | count = 0; | |
| 348 | while (buffer[count]) count++; | |
| 349 | for (i=3; i <= count; i++) | |
| 350 | buffer[i - 3] = buffer[i]; | |
| 351 | } | |
| 352 | ||
| 353 | break; | |
| 354 | } | |
| 355 | } /* end gdbstub_recv_packet() */ | |
| 356 | ||
| 357 | /*****************************************************************************/ | |
| 358 | /* | |
| 359 | * send the packet in buffer. | |
| 360 | * - return 0 if successfully ACK'd | |
| 361 | * - return 1 if abandoned due to new incoming packet | |
| 362 | */ | |
| 363 | static int gdbstub_send_packet(char *buffer) | |
| 364 | { | |
| 365 | unsigned char checksum; | |
| 366 | int count; | |
| 367 | unsigned char ch; | |
| 368 | ||
| 369 | /* $<packet info>#<checksum> */ | |
| 370 | gdbstub_proto("### GDB Tx '%s' ###\n", buffer); | |
| 371 | ||
| 372 | do { | |
| 373 | gdbstub_tx_char('$'); | |
| 374 | checksum = 0; | |
| 375 | count = 0; | |
| 376 | ||
| 377 | while ((ch = buffer[count]) != 0) { | |
| 378 | gdbstub_tx_char(ch); | |
| 379 | checksum += ch; | |
| 380 | count += 1; | |
| 381 | } | |
| 382 | ||
| 383 | gdbstub_tx_char('#'); | |
| 19caeed6 HH |
384 | gdbstub_tx_char(hex_asc_hi(checksum)); |
| 385 | gdbstub_tx_char(hex_asc_lo(checksum)); | |
| 1da177e4 LT |
386 | |
| 387 | } while (gdbstub_rx_char(&ch,0), | |
| 388 | #ifdef GDBSTUB_DEBUG_PROTOCOL | |
| 389 | ch=='-' && (gdbstub_proto("### GDB Rx NAK\n"),0), | |
| 390 | ch!='-' && ch!='+' && (gdbstub_proto("### GDB Rx ??? %02x\n",ch),0), | |
| 391 | #endif | |
| 392 | ch!='+' && ch!='$'); | |
| 393 | ||
| 394 | if (ch=='+') { | |
| 395 | gdbstub_proto("### GDB Rx ACK\n"); | |
| 396 | return 0; | |
| 397 | } | |
| 398 | ||
| 399 | gdbstub_proto("### GDB Tx Abandoned\n"); | |
| 400 | gdbstub_rx_unget = ch; | |
| 401 | return 1; | |
| 402 | } /* end gdbstub_send_packet() */ | |
| 403 | ||
| 404 | /* | |
| 405 | * While we find nice hex chars, build an int. | |
| 406 | * Return number of chars processed. | |
| 407 | */ | |
| 408 | static int hexToInt(char **ptr, unsigned long *_value) | |
| 409 | { | |
| 410 | int count = 0, ch; | |
| 411 | ||
| 412 | *_value = 0; | |
| 413 | while (**ptr) { | |
| 414 | ch = hex(**ptr); | |
| 415 | if (ch < 0) | |
| 416 | break; | |
| 417 | ||
| 418 | *_value = (*_value << 4) | ((uint8_t) ch & 0xf); | |
| 419 | count++; | |
| 420 | ||
| 421 | (*ptr)++; | |
| 422 | } | |
| 423 | ||
| 424 | return count; | |
| 425 | } | |
| 426 | ||
| 427 | /*****************************************************************************/ | |
| 428 | /* | |
| 429 | * probe an address to see whether it maps to anything | |
| 430 | */ | |
| 431 | static inline int gdbstub_addr_probe(const void *vaddr) | |
| 432 | { | |
| 433 | #ifdef CONFIG_MMU | |
| 434 | unsigned long paddr; | |
| 435 | ||
| 436 | asm("lrad %1,%0,#1,#0,#0" : "=r"(paddr) : "r"(vaddr)); | |
| 437 | if (!(paddr & xAMPRx_V)) | |
| 438 | return 0; | |
| 439 | #endif | |
| 440 | ||
| 441 | return 1; | |
| 442 | } /* end gdbstub_addr_probe() */ | |
| 443 | ||
| 444 | #ifdef CONFIG_MMU | |
| 445 | static unsigned long __saved_dampr, __saved_damlr; | |
| 446 | ||
| 447 | static inline unsigned long gdbstub_virt_to_pte(unsigned long vaddr) | |
| 448 | { | |
| 449 | pgd_t *pgd; | |
| 450 | pud_t *pud; | |
| 451 | pmd_t *pmd; | |
| 452 | pte_t *pte; | |
| 453 | unsigned long val, dampr5; | |
| 454 | ||
| 455 | pgd = (pgd_t *) __get_DAMLR(3) + pgd_index(vaddr); | |
| 456 | pud = pud_offset(pgd, vaddr); | |
| 457 | pmd = pmd_offset(pud, vaddr); | |
| 458 | ||
| 459 | if (pmd_bad(*pmd) || !pmd_present(*pmd)) | |
| 460 | return 0; | |
| 461 | ||
| 462 | /* make sure dampr5 maps to the correct pmd */ | |
| 463 | dampr5 = __get_DAMPR(5); | |
| 464 | val = pmd_val(*pmd); | |
| 465 | __set_DAMPR(5, val | xAMPRx_L | xAMPRx_SS_16Kb | xAMPRx_S | xAMPRx_C | xAMPRx_V); | |
| 466 | ||
| 467 | /* now its safe to access pmd */ | |
| 468 | pte = (pte_t *)__get_DAMLR(5) + __pte_index(vaddr); | |
| 469 | if (pte_present(*pte)) | |
| 470 | val = pte_val(*pte); | |
| 471 | else | |
| 472 | val = 0; | |
| 473 | ||
| 474 | /* restore original dampr5 */ | |
| 475 | __set_DAMPR(5, dampr5); | |
| 476 | ||
| 477 | return val; | |
| 478 | } | |
| 479 | #endif | |
| 480 | ||
| 481 | static inline int gdbstub_addr_map(const void *vaddr) | |
| 482 | { | |
| 483 | #ifdef CONFIG_MMU | |
| 484 | unsigned long pte; | |
| 485 | ||
| 486 | __saved_dampr = __get_DAMPR(2); | |
| 487 | __saved_damlr = __get_DAMLR(2); | |
| 488 | #endif | |
| 489 | if (gdbstub_addr_probe(vaddr)) | |
| 490 | return 1; | |
| 491 | #ifdef CONFIG_MMU | |
| 492 | pte = gdbstub_virt_to_pte((unsigned long) vaddr); | |
| 493 | if (pte) { | |
| 494 | __set_DAMPR(2, pte); | |
| 495 | __set_DAMLR(2, (unsigned long) vaddr & PAGE_MASK); | |
| 496 | return 1; | |
| 497 | } | |
| 498 | #endif | |
| 499 | return 0; | |
| 500 | } | |
| 501 | ||
| 502 | static inline void gdbstub_addr_unmap(void) | |
| 503 | { | |
| 504 | #ifdef CONFIG_MMU | |
| 505 | __set_DAMPR(2, __saved_dampr); | |
| 506 | __set_DAMLR(2, __saved_damlr); | |
| 507 | #endif | |
| 508 | } | |
| 509 | ||
| 510 | /* | |
| 511 | * access potentially dodgy memory through a potentially dodgy pointer | |
| 512 | */ | |
| 513 | static inline int gdbstub_read_dword(const void *addr, uint32_t *_res) | |
| 514 | { | |
| 515 | unsigned long brr; | |
| 516 | uint32_t res; | |
| 517 | ||
| 518 | if (!gdbstub_addr_map(addr)) | |
| 519 | return 0; | |
| 520 | ||
| 521 | asm volatile(" movgs gr0,brr \n" | |
| 522 | " ld%I2 %M2,%0 \n" | |
| 523 | " movsg brr,%1 \n" | |
| 524 | : "=r"(res), "=r"(brr) | |
| 525 | : "m"(*(uint32_t *) addr)); | |
| 526 | *_res = res; | |
| 527 | gdbstub_addr_unmap(); | |
| 528 | return likely(!brr); | |
| 529 | } | |
| 530 | ||
| 531 | static inline int gdbstub_write_dword(void *addr, uint32_t val) | |
| 532 | { | |
| 533 | unsigned long brr; | |
| 534 | ||
| 535 | if (!gdbstub_addr_map(addr)) | |
| 536 | return 0; | |
| 537 | ||
| 538 | asm volatile(" movgs gr0,brr \n" | |
| 539 | " st%I2 %1,%M2 \n" | |
| 540 | " movsg brr,%0 \n" | |
| 541 | : "=r"(brr) | |
| 542 | : "r"(val), "m"(*(uint32_t *) addr)); | |
| 543 | gdbstub_addr_unmap(); | |
| 544 | return likely(!brr); | |
| 545 | } | |
| 546 | ||
| 547 | static inline int gdbstub_read_word(const void *addr, uint16_t *_res) | |
| 548 | { | |
| 549 | unsigned long brr; | |
| 550 | uint16_t res; | |
| 551 | ||
| 552 | if (!gdbstub_addr_map(addr)) | |
| 553 | return 0; | |
| 554 | ||
| 555 | asm volatile(" movgs gr0,brr \n" | |
| 556 | " lduh%I2 %M2,%0 \n" | |
| 557 | " movsg brr,%1 \n" | |
| 558 | : "=r"(res), "=r"(brr) | |
| 559 | : "m"(*(uint16_t *) addr)); | |
| 560 | *_res = res; | |
| 561 | gdbstub_addr_unmap(); | |
| 562 | return likely(!brr); | |
| 563 | } | |
| 564 | ||
| 565 | static inline int gdbstub_write_word(void *addr, uint16_t val) | |
| 566 | { | |
| 567 | unsigned long brr; | |
| 568 | ||
| 569 | if (!gdbstub_addr_map(addr)) | |
| 570 | return 0; | |
| 571 | ||
| 572 | asm volatile(" movgs gr0,brr \n" | |
| 573 | " sth%I2 %1,%M2 \n" | |
| 574 | " movsg brr,%0 \n" | |
| 575 | : "=r"(brr) | |
| 576 | : "r"(val), "m"(*(uint16_t *) addr)); | |
| 577 | gdbstub_addr_unmap(); | |
| 578 | return likely(!brr); | |
| 579 | } | |
| 580 | ||
| 581 | static inline int gdbstub_read_byte(const void *addr, uint8_t *_res) | |
| 582 | { | |
| 583 | unsigned long brr; | |
| 584 | uint8_t res; | |
| 585 | ||
| 586 | if (!gdbstub_addr_map(addr)) | |
| 587 | return 0; | |
| 588 | ||
| 589 | asm volatile(" movgs gr0,brr \n" | |
| 590 | " ldub%I2 %M2,%0 \n" | |
| 591 | " movsg brr,%1 \n" | |
| 592 | : "=r"(res), "=r"(brr) | |
| 593 | : "m"(*(uint8_t *) addr)); | |
| 594 | *_res = res; | |
| 595 | gdbstub_addr_unmap(); | |
| 596 | return likely(!brr); | |
| 597 | } | |
| 598 | ||
| 599 | static inline int gdbstub_write_byte(void *addr, uint8_t val) | |
| 600 | { | |
| 601 | unsigned long brr; | |
| 602 | ||
| 603 | if (!gdbstub_addr_map(addr)) | |
| 604 | return 0; | |
| 605 | ||
| 606 | asm volatile(" movgs gr0,brr \n" | |
| 607 | " stb%I2 %1,%M2 \n" | |
| 608 | " movsg brr,%0 \n" | |
| 609 | : "=r"(brr) | |
| 610 | : "r"(val), "m"(*(uint8_t *) addr)); | |
| 611 | gdbstub_addr_unmap(); | |
| 612 | return likely(!brr); | |
| 613 | } | |
| 614 | ||
| 615 | static void __gdbstub_console_write(struct console *co, const char *p, unsigned n) | |
| 616 | { | |
| 617 | char outbuf[26]; | |
| 618 | int qty; | |
| 619 | ||
| 620 | outbuf[0] = 'O'; | |
| 621 | ||
| 622 | while (n > 0) { | |
| 623 | qty = 1; | |
| 624 | ||
| 625 | while (n > 0 && qty < 20) { | |
| 626 | mem2hex(p, outbuf + qty, 2, 0); | |
| 627 | qty += 2; | |
| 628 | if (*p == 0x0a) { | |
| 629 | outbuf[qty++] = '0'; | |
| 630 | outbuf[qty++] = 'd'; | |
| 631 | } | |
| 632 | p++; | |
| 633 | n--; | |
| 634 | } | |
| 635 | ||
| 636 | outbuf[qty] = 0; | |
| 637 | gdbstub_send_packet(outbuf); | |
| 638 | } | |
| 639 | } | |
| 640 | ||
| 641 | #if 0 | |
| 642 | void debug_to_serial(const char *p, int n) | |
| 643 | { | |
| 644 | gdbstub_console_write(NULL,p,n); | |
| 645 | } | |
| 646 | #endif | |
| 647 | ||
| 76925916 | 648 | #ifdef CONFIG_GDB_CONSOLE |
| 1da177e4 LT |
649 | |
| 650 | static struct console gdbstub_console = { | |
| 651 | .name = "gdb", | |
| 652 | .write = gdbstub_console_write, /* in break.S */ | |
| 1da177e4 LT |
653 | .flags = CON_PRINTBUFFER, |
| 654 | .index = -1, | |
| 655 | }; | |
| 656 | ||
| 657 | #endif | |
| 658 | ||
| 659 | /*****************************************************************************/ | |
| 660 | /* | |
| 661 | * Convert the memory pointed to by mem into hex, placing result in buf. | |
| 662 | * - if successful, return a pointer to the last char put in buf (NUL) | |
| 663 | * - in case of mem fault, return NULL | |
| 664 | * may_fault is non-zero if we are reading from arbitrary memory, but is currently | |
| 665 | * not used. | |
| 666 | */ | |
| 667 | static unsigned char *mem2hex(const void *_mem, char *buf, int count, int may_fault) | |
| 668 | { | |
| 669 | const uint8_t *mem = _mem; | |
| 670 | uint8_t ch[4] __attribute__((aligned(4))); | |
| 671 | ||
| 672 | if ((uint32_t)mem&1 && count>=1) { | |
| 673 | if (!gdbstub_read_byte(mem,ch)) | |
| 674 | return NULL; | |
| 19caeed6 | 675 | buf = pack_hex_byte(buf, ch[0]); |
| 1da177e4 LT |
676 | mem++; |
| 677 | count--; | |
| 678 | } | |
| 679 | ||
| 680 | if ((uint32_t)mem&3 && count>=2) { | |
| 681 | if (!gdbstub_read_word(mem,(uint16_t *)ch)) | |
| 682 | return NULL; | |
| 19caeed6 HH |
683 | buf = pack_hex_byte(buf, ch[0]); |
| 684 | buf = pack_hex_byte(buf, ch[1]); | |
| 1da177e4 LT |
685 | mem += 2; |
| 686 | count -= 2; | |
| 687 | } | |
| 688 | ||
| 689 | while (count>=4) { | |
| 690 | if (!gdbstub_read_dword(mem,(uint32_t *)ch)) | |
| 691 | return NULL; | |
| 19caeed6 HH |
692 | buf = pack_hex_byte(buf, ch[0]); |
| 693 | buf = pack_hex_byte(buf, ch[1]); | |
| 694 | buf = pack_hex_byte(buf, ch[2]); | |
| 695 | buf = pack_hex_byte(buf, ch[3]); | |
| 1da177e4 LT |
696 | mem += 4; |
| 697 | count -= 4; | |
| 698 | } | |
| 699 | ||
| 700 | if (count>=2) { | |
| 701 | if (!gdbstub_read_word(mem,(uint16_t *)ch)) | |
| 702 | return NULL; | |
| 19caeed6 HH |
703 | buf = pack_hex_byte(buf, ch[0]); |
| 704 | buf = pack_hex_byte(buf, ch[1]); | |
| 1da177e4 LT |
705 | mem += 2; |
| 706 | count -= 2; | |
| 707 | } | |
| 708 | ||
| 709 | if (count>=1) { | |
| 710 | if (!gdbstub_read_byte(mem,ch)) | |
| 711 | return NULL; | |
| 19caeed6 | 712 | buf = pack_hex_byte(buf, ch[0]); |
| 1da177e4 LT |
713 | } |
| 714 | ||
| 715 | *buf = 0; | |
| 716 | ||
| 717 | return buf; | |
| 718 | } /* end mem2hex() */ | |
| 719 | ||
| 720 | /*****************************************************************************/ | |
| 721 | /* | |
| 722 | * convert the hex array pointed to by buf into binary to be placed in mem | |
| 723 | * return a pointer to the character AFTER the last byte of buffer consumed | |
| 724 | */ | |
| 725 | static char *hex2mem(const char *buf, void *_mem, int count) | |
| 726 | { | |
| 727 | uint8_t *mem = _mem; | |
| 728 | union { | |
| 729 | uint32_t l; | |
| 730 | uint16_t w; | |
| 731 | uint8_t b[4]; | |
| 732 | } ch; | |
| 733 | ||
| 734 | if ((u32)mem&1 && count>=1) { | |
| 735 | ch.b[0] = hex(*buf++) << 4; | |
| 736 | ch.b[0] |= hex(*buf++); | |
| 737 | if (!gdbstub_write_byte(mem,ch.b[0])) | |
| 738 | return NULL; | |
| 739 | mem++; | |
| 740 | count--; | |
| 741 | } | |
| 742 | ||
| 743 | if ((u32)mem&3 && count>=2) { | |
| 744 | ch.b[0] = hex(*buf++) << 4; | |
| 745 | ch.b[0] |= hex(*buf++); | |
| 746 | ch.b[1] = hex(*buf++) << 4; | |
| 747 | ch.b[1] |= hex(*buf++); | |
| 748 | if (!gdbstub_write_word(mem,ch.w)) | |
| 749 | return NULL; | |
| 750 | mem += 2; | |
| 751 | count -= 2; | |
| 752 | } | |
| 753 | ||
| 754 | while (count>=4) { | |
| 755 | ch.b[0] = hex(*buf++) << 4; | |
| 756 | ch.b[0] |= hex(*buf++); | |
| 757 | ch.b[1] = hex(*buf++) << 4; | |
| 758 | ch.b[1] |= hex(*buf++); | |
| 759 | ch.b[2] = hex(*buf++) << 4; | |
| 760 | ch.b[2] |= hex(*buf++); | |
| 761 | ch.b[3] = hex(*buf++) << 4; | |
| 762 | ch.b[3] |= hex(*buf++); | |
| 763 | if (!gdbstub_write_dword(mem,ch.l)) | |
| 764 | return NULL; | |
| 765 | mem += 4; | |
| 766 | count -= 4; | |
| 767 | } | |
| 768 | ||
| 769 | if (count>=2) { | |
| 770 | ch.b[0] = hex(*buf++) << 4; | |
| 771 | ch.b[0] |= hex(*buf++); | |
| 772 | ch.b[1] = hex(*buf++) << 4; | |
| 773 | ch.b[1] |= hex(*buf++); | |
| 774 | if (!gdbstub_write_word(mem,ch.w)) | |
| 775 | return NULL; | |
| 776 | mem += 2; | |
| 777 | count -= 2; | |
| 778 | } | |
| 779 | ||
| 780 | if (count>=1) { | |
| 781 | ch.b[0] = hex(*buf++) << 4; | |
| 782 | ch.b[0] |= hex(*buf++); | |
| 783 | if (!gdbstub_write_byte(mem,ch.b[0])) | |
| 784 | return NULL; | |
| 785 | } | |
| 786 | ||
| 787 | return (char *) buf; | |
| 788 | } /* end hex2mem() */ | |
| 789 | ||
| 790 | /*****************************************************************************/ | |
| 791 | /* | |
| 792 | * This table contains the mapping between FRV TBR.TT exception codes, | |
| 793 | * and signals, which are primarily what GDB understands. It also | |
| 794 | * indicates which hardware traps we need to commandeer when | |
| 795 | * initializing the stub. | |
| 796 | */ | |
| 797 | static const struct brr_to_sig_map { | |
| 798 | unsigned long brr_mask; /* BRR bitmask */ | |
| 799 | unsigned long tbr_tt; /* TBR.TT code (in BRR.EBTT) */ | |
| 800 | unsigned int signo; /* Signal that we map this into */ | |
| 801 | } brr_to_sig_map[] = { | |
| 802 | { BRR_EB, TBR_TT_INSTR_ACC_ERROR, SIGSEGV }, | |
| 803 | { BRR_EB, TBR_TT_ILLEGAL_INSTR, SIGILL }, | |
| 804 | { BRR_EB, TBR_TT_PRIV_INSTR, SIGILL }, | |
| 805 | { BRR_EB, TBR_TT_MP_EXCEPTION, SIGFPE }, | |
| 806 | { BRR_EB, TBR_TT_DATA_ACC_ERROR, SIGSEGV }, | |
| 807 | { BRR_EB, TBR_TT_DATA_STR_ERROR, SIGSEGV }, | |
| 808 | { BRR_EB, TBR_TT_DIVISION_EXCEP, SIGFPE }, | |
| 809 | { BRR_EB, TBR_TT_COMPOUND_EXCEP, SIGSEGV }, | |
| 810 | { BRR_EB, TBR_TT_INTERRUPT_13, SIGALRM }, /* watchdog */ | |
| 811 | { BRR_EB, TBR_TT_INTERRUPT_14, SIGINT }, /* GDB serial */ | |
| 812 | { BRR_EB, TBR_TT_INTERRUPT_15, SIGQUIT }, /* NMI */ | |
| 813 | { BRR_CB, 0, SIGUSR1 }, | |
| 814 | { BRR_TB, 0, SIGUSR2 }, | |
| 815 | { BRR_DBNEx, 0, SIGTRAP }, | |
| 816 | { BRR_DBx, 0, SIGTRAP }, /* h/w watchpoint */ | |
| 817 | { BRR_IBx, 0, SIGTRAP }, /* h/w breakpoint */ | |
| 818 | { BRR_CBB, 0, SIGTRAP }, | |
| 819 | { BRR_SB, 0, SIGTRAP }, | |
| 820 | { BRR_ST, 0, SIGTRAP }, /* single step */ | |
| 821 | { 0, 0, SIGHUP } /* default */ | |
| 822 | }; | |
| 823 | ||
| 824 | /*****************************************************************************/ | |
| 825 | /* | |
| 826 | * convert the FRV BRR register contents into a UNIX signal number | |
| 827 | */ | |
| 828 | static inline int gdbstub_compute_signal(unsigned long brr) | |
| 829 | { | |
| 830 | const struct brr_to_sig_map *map; | |
| 831 | unsigned long tbr = (brr & BRR_EBTT) >> 12; | |
| 832 | ||
| 833 | for (map = brr_to_sig_map; map->brr_mask; map++) | |
| 834 | if (map->brr_mask & brr) | |
| 835 | if (!map->tbr_tt || map->tbr_tt == tbr) | |
| 836 | break; | |
| 837 | ||
| 838 | return map->signo; | |
| 839 | } /* end gdbstub_compute_signal() */ | |
| 840 | ||
| 841 | /*****************************************************************************/ | |
| 842 | /* | |
| 843 | * set a software breakpoint or a hardware breakpoint or watchpoint | |
| 844 | */ | |
| 845 | static int gdbstub_set_breakpoint(unsigned long type, unsigned long addr, unsigned long len) | |
| 846 | { | |
| 847 | unsigned long tmp; | |
| 848 | int bkpt, loop, xloop; | |
| 849 | ||
| 850 | union { | |
| 851 | struct { | |
| 852 | unsigned long mask0, mask1; | |
| 853 | }; | |
| 854 | uint8_t bytes[8]; | |
| 855 | } dbmr; | |
| 856 | ||
| 857 | //gdbstub_printk("setbkpt(%ld,%08lx,%ld)\n", type, addr, len); | |
| 858 | ||
| 859 | switch (type) { | |
| 860 | /* set software breakpoint */ | |
| 861 | case 0: | |
| 862 | if (addr & 3 || len > 7*4) | |
| 863 | return -EINVAL; | |
| 864 | ||
| 865 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
| 866 | if (!gdbstub_bkpts[bkpt].addr) | |
| 867 | break; | |
| 868 | if (bkpt < 0) | |
| 869 | return -ENOSPC; | |
| 870 | ||
| 871 | for (loop = 0; loop < len/4; loop++) | |
| 872 | if (!gdbstub_read_dword(&((uint32_t *) addr)[loop], | |
| 873 | &gdbstub_bkpts[bkpt].originsns[loop])) | |
| 874 | return -EFAULT; | |
| 875 | ||
| 876 | for (loop = 0; loop < len/4; loop++) | |
| 877 | if (!gdbstub_write_dword(&((uint32_t *) addr)[loop], | |
| 878 | BREAK_INSN) | |
| 879 | ) { | |
| 880 | /* need to undo the changes if possible */ | |
| 881 | for (xloop = 0; xloop < loop; xloop++) | |
| 882 | gdbstub_write_dword(&((uint32_t *) addr)[xloop], | |
| 883 | gdbstub_bkpts[bkpt].originsns[xloop]); | |
| 884 | return -EFAULT; | |
| 885 | } | |
| 886 | ||
| 887 | gdbstub_bkpts[bkpt].addr = addr; | |
| 888 | gdbstub_bkpts[bkpt].len = len; | |
| 889 | ||
| 890 | #if 0 | |
| 891 | gdbstub_printk("Set BKPT[%02x]: %08lx #%d {%04x, %04x} -> { %04x, %04x }\n", | |
| 892 | bkpt, | |
| 893 | gdbstub_bkpts[bkpt].addr, | |
| 894 | gdbstub_bkpts[bkpt].len, | |
| 895 | gdbstub_bkpts[bkpt].originsns[0], | |
| 896 | gdbstub_bkpts[bkpt].originsns[1], | |
| 897 | ((uint32_t *) addr)[0], | |
| 898 | ((uint32_t *) addr)[1] | |
| 899 | ); | |
| 900 | #endif | |
| 901 | return 0; | |
| 902 | ||
| 903 | /* set hardware breakpoint */ | |
| 904 | case 1: | |
| 905 | if (addr & 3 || len != 4) | |
| 906 | return -EINVAL; | |
| 907 | ||
| 908 | if (!(__debug_regs->dcr & DCR_IBE0)) { | |
| 909 | //gdbstub_printk("set h/w break 0: %08lx\n", addr); | |
| 910 | __debug_regs->dcr |= DCR_IBE0; | |
| 84e8cd6d | 911 | __debug_regs->ibar[0] = addr; |
| 1da177e4 LT |
912 | asm volatile("movgs %0,ibar0" : : "r"(addr)); |
| 913 | return 0; | |
| 914 | } | |
| 915 | ||
| 916 | if (!(__debug_regs->dcr & DCR_IBE1)) { | |
| 917 | //gdbstub_printk("set h/w break 1: %08lx\n", addr); | |
| 918 | __debug_regs->dcr |= DCR_IBE1; | |
| 84e8cd6d | 919 | __debug_regs->ibar[1] = addr; |
| 1da177e4 LT |
920 | asm volatile("movgs %0,ibar1" : : "r"(addr)); |
| 921 | return 0; | |
| 922 | } | |
| 923 | ||
| 924 | if (!(__debug_regs->dcr & DCR_IBE2)) { | |
| 925 | //gdbstub_printk("set h/w break 2: %08lx\n", addr); | |
| 926 | __debug_regs->dcr |= DCR_IBE2; | |
| 84e8cd6d | 927 | __debug_regs->ibar[2] = addr; |
| 1da177e4 LT |
928 | asm volatile("movgs %0,ibar2" : : "r"(addr)); |
| 929 | return 0; | |
| 930 | } | |
| 931 | ||
| 932 | if (!(__debug_regs->dcr & DCR_IBE3)) { | |
| 933 | //gdbstub_printk("set h/w break 3: %08lx\n", addr); | |
| 934 | __debug_regs->dcr |= DCR_IBE3; | |
| 84e8cd6d | 935 | __debug_regs->ibar[3] = addr; |
| 1da177e4 LT |
936 | asm volatile("movgs %0,ibar3" : : "r"(addr)); |
| 937 | return 0; | |
| 938 | } | |
| 939 | ||
| 940 | return -ENOSPC; | |
| 941 | ||
| 942 | /* set data read/write/access watchpoint */ | |
| 943 | case 2: | |
| 944 | case 3: | |
| 945 | case 4: | |
| 946 | if ((addr & ~7) != ((addr + len - 1) & ~7)) | |
| 947 | return -EINVAL; | |
| 948 | ||
| 949 | tmp = addr & 7; | |
| 950 | ||
| 951 | memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes)); | |
| 952 | for (loop = 0; loop < len; loop++) | |
| 953 | dbmr.bytes[tmp + loop] = 0; | |
| 954 | ||
| 955 | addr &= ~7; | |
| 956 | ||
| 957 | if (!(__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0))) { | |
| 958 | //gdbstub_printk("set h/w watchpoint 0 type %ld: %08lx\n", type, addr); | |
| 959 | tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0; | |
| 84e8cd6d | 960 | |
| 1da177e4 | 961 | __debug_regs->dcr |= tmp; |
| 84e8cd6d DH |
962 | __debug_regs->dbar[0] = addr; |
| 963 | __debug_regs->dbmr[0][0] = dbmr.mask0; | |
| 964 | __debug_regs->dbmr[0][1] = dbmr.mask1; | |
| 965 | __debug_regs->dbdr[0][0] = 0; | |
| 966 | __debug_regs->dbdr[0][1] = 0; | |
| 967 | ||
| 1da177e4 LT |
968 | asm volatile(" movgs %0,dbar0 \n" |
| 969 | " movgs %1,dbmr00 \n" | |
| 970 | " movgs %2,dbmr01 \n" | |
| 971 | " movgs gr0,dbdr00 \n" | |
| 972 | " movgs gr0,dbdr01 \n" | |
| 973 | : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1)); | |
| 974 | return 0; | |
| 975 | } | |
| 976 | ||
| 977 | if (!(__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1))) { | |
| 978 | //gdbstub_printk("set h/w watchpoint 1 type %ld: %08lx\n", type, addr); | |
| 979 | tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1; | |
| 84e8cd6d | 980 | |
| 1da177e4 | 981 | __debug_regs->dcr |= tmp; |
| 84e8cd6d DH |
982 | __debug_regs->dbar[1] = addr; |
| 983 | __debug_regs->dbmr[1][0] = dbmr.mask0; | |
| 984 | __debug_regs->dbmr[1][1] = dbmr.mask1; | |
| 985 | __debug_regs->dbdr[1][0] = 0; | |
| 986 | __debug_regs->dbdr[1][1] = 0; | |
| 987 | ||
| 1da177e4 LT |
988 | asm volatile(" movgs %0,dbar1 \n" |
| 989 | " movgs %1,dbmr10 \n" | |
| 990 | " movgs %2,dbmr11 \n" | |
| 991 | " movgs gr0,dbdr10 \n" | |
| 992 | " movgs gr0,dbdr11 \n" | |
| 993 | : : "r"(addr), "r"(dbmr.mask0), "r"(dbmr.mask1)); | |
| 994 | return 0; | |
| 995 | } | |
| 996 | ||
| 997 | return -ENOSPC; | |
| 998 | ||
| 999 | default: | |
| 1000 | return -EINVAL; | |
| 1001 | } | |
| 1002 | ||
| 1003 | } /* end gdbstub_set_breakpoint() */ | |
| 1004 | ||
| 1005 | /*****************************************************************************/ | |
| 1006 | /* | |
| 1007 | * clear a breakpoint or watchpoint | |
| 1008 | */ | |
| 1009 | int gdbstub_clear_breakpoint(unsigned long type, unsigned long addr, unsigned long len) | |
| 1010 | { | |
| 1011 | unsigned long tmp; | |
| 1012 | int bkpt, loop; | |
| 1013 | ||
| 1014 | union { | |
| 1015 | struct { | |
| 1016 | unsigned long mask0, mask1; | |
| 1017 | }; | |
| 1018 | uint8_t bytes[8]; | |
| 1019 | } dbmr; | |
| 1020 | ||
| 1021 | //gdbstub_printk("clearbkpt(%ld,%08lx,%ld)\n", type, addr, len); | |
| 1022 | ||
| 1023 | switch (type) { | |
| 1024 | /* clear software breakpoint */ | |
| 1025 | case 0: | |
| 1026 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
| 1027 | if (gdbstub_bkpts[bkpt].addr == addr && gdbstub_bkpts[bkpt].len == len) | |
| 1028 | break; | |
| 1029 | if (bkpt < 0) | |
| 1030 | return -ENOENT; | |
| 1031 | ||
| 1032 | gdbstub_bkpts[bkpt].addr = 0; | |
| 1033 | ||
| 1034 | for (loop = 0; loop < len/4; loop++) | |
| 1035 | if (!gdbstub_write_dword(&((uint32_t *) addr)[loop], | |
| 1036 | gdbstub_bkpts[bkpt].originsns[loop])) | |
| 1037 | return -EFAULT; | |
| 1038 | return 0; | |
| 1039 | ||
| 1040 | /* clear hardware breakpoint */ | |
| 1041 | case 1: | |
| 1042 | if (addr & 3 || len != 4) | |
| 1043 | return -EINVAL; | |
| 1044 | ||
| 1045 | #define __get_ibar(X) ({ unsigned long x; asm volatile("movsg ibar"#X",%0" : "=r"(x)); x; }) | |
| 1046 | ||
| 1047 | if (__debug_regs->dcr & DCR_IBE0 && __get_ibar(0) == addr) { | |
| 1048 | //gdbstub_printk("clear h/w break 0: %08lx\n", addr); | |
| 1049 | __debug_regs->dcr &= ~DCR_IBE0; | |
| 84e8cd6d | 1050 | __debug_regs->ibar[0] = 0; |
| 1da177e4 LT |
1051 | asm volatile("movgs gr0,ibar0"); |
| 1052 | return 0; | |
| 1053 | } | |
| 1054 | ||
| 1055 | if (__debug_regs->dcr & DCR_IBE1 && __get_ibar(1) == addr) { | |
| 1056 | //gdbstub_printk("clear h/w break 1: %08lx\n", addr); | |
| 1057 | __debug_regs->dcr &= ~DCR_IBE1; | |
| 84e8cd6d | 1058 | __debug_regs->ibar[1] = 0; |
| 1da177e4 LT |
1059 | asm volatile("movgs gr0,ibar1"); |
| 1060 | return 0; | |
| 1061 | } | |
| 1062 | ||
| 1063 | if (__debug_regs->dcr & DCR_IBE2 && __get_ibar(2) == addr) { | |
| 1064 | //gdbstub_printk("clear h/w break 2: %08lx\n", addr); | |
| 1065 | __debug_regs->dcr &= ~DCR_IBE2; | |
| 84e8cd6d | 1066 | __debug_regs->ibar[2] = 0; |
| 1da177e4 LT |
1067 | asm volatile("movgs gr0,ibar2"); |
| 1068 | return 0; | |
| 1069 | } | |
| 1070 | ||
| 1071 | if (__debug_regs->dcr & DCR_IBE3 && __get_ibar(3) == addr) { | |
| 1072 | //gdbstub_printk("clear h/w break 3: %08lx\n", addr); | |
| 1073 | __debug_regs->dcr &= ~DCR_IBE3; | |
| 84e8cd6d | 1074 | __debug_regs->ibar[3] = 0; |
| 1da177e4 LT |
1075 | asm volatile("movgs gr0,ibar3"); |
| 1076 | return 0; | |
| 1077 | } | |
| 1078 | ||
| 1079 | return -EINVAL; | |
| 1080 | ||
| 1081 | /* clear data read/write/access watchpoint */ | |
| 1082 | case 2: | |
| 1083 | case 3: | |
| 1084 | case 4: | |
| 1085 | if ((addr & ~7) != ((addr + len - 1) & ~7)) | |
| 1086 | return -EINVAL; | |
| 1087 | ||
| 1088 | tmp = addr & 7; | |
| 1089 | ||
| 1090 | memset(dbmr.bytes, 0xff, sizeof(dbmr.bytes)); | |
| 1091 | for (loop = 0; loop < len; loop++) | |
| 1092 | dbmr.bytes[tmp + loop] = 0; | |
| 1093 | ||
| 1094 | addr &= ~7; | |
| 1095 | ||
| 1096 | #define __get_dbar(X) ({ unsigned long x; asm volatile("movsg dbar"#X",%0" : "=r"(x)); x; }) | |
| 1097 | #define __get_dbmr0(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"0,%0" : "=r"(x)); x; }) | |
| 1098 | #define __get_dbmr1(X) ({ unsigned long x; asm volatile("movsg dbmr"#X"1,%0" : "=r"(x)); x; }) | |
| 1099 | ||
| 1100 | /* consider DBAR 0 */ | |
| 1101 | tmp = type==2 ? DCR_DWBE0 : type==3 ? DCR_DRBE0 : DCR_DRBE0|DCR_DWBE0; | |
| 1102 | ||
| 1103 | if ((__debug_regs->dcr & (DCR_DRBE0|DCR_DWBE0)) != tmp || | |
| 1104 | __get_dbar(0) != addr || | |
| 1105 | __get_dbmr0(0) != dbmr.mask0 || | |
| 1106 | __get_dbmr1(0) != dbmr.mask1) | |
| 1107 | goto skip_dbar0; | |
| 1108 | ||
| 1109 | //gdbstub_printk("clear h/w watchpoint 0 type %ld: %08lx\n", type, addr); | |
| 1110 | __debug_regs->dcr &= ~(DCR_DRBE0|DCR_DWBE0); | |
| 84e8cd6d DH |
1111 | __debug_regs->dbar[0] = 0; |
| 1112 | __debug_regs->dbmr[0][0] = 0; | |
| 1113 | __debug_regs->dbmr[0][1] = 0; | |
| 1114 | __debug_regs->dbdr[0][0] = 0; | |
| 1115 | __debug_regs->dbdr[0][1] = 0; | |
| 1116 | ||
| 1da177e4 LT |
1117 | asm volatile(" movgs gr0,dbar0 \n" |
| 1118 | " movgs gr0,dbmr00 \n" | |
| 1119 | " movgs gr0,dbmr01 \n" | |
| 1120 | " movgs gr0,dbdr00 \n" | |
| 1121 | " movgs gr0,dbdr01 \n"); | |
| 1122 | return 0; | |
| 1123 | ||
| 1124 | skip_dbar0: | |
| 1125 | /* consider DBAR 0 */ | |
| 1126 | tmp = type==2 ? DCR_DWBE1 : type==3 ? DCR_DRBE1 : DCR_DRBE1|DCR_DWBE1; | |
| 1127 | ||
| 1128 | if ((__debug_regs->dcr & (DCR_DRBE1|DCR_DWBE1)) != tmp || | |
| 1129 | __get_dbar(1) != addr || | |
| 1130 | __get_dbmr0(1) != dbmr.mask0 || | |
| 1131 | __get_dbmr1(1) != dbmr.mask1) | |
| 1132 | goto skip_dbar1; | |
| 1133 | ||
| 1134 | //gdbstub_printk("clear h/w watchpoint 1 type %ld: %08lx\n", type, addr); | |
| 1135 | __debug_regs->dcr &= ~(DCR_DRBE1|DCR_DWBE1); | |
| 84e8cd6d DH |
1136 | __debug_regs->dbar[1] = 0; |
| 1137 | __debug_regs->dbmr[1][0] = 0; | |
| 1138 | __debug_regs->dbmr[1][1] = 0; | |
| 1139 | __debug_regs->dbdr[1][0] = 0; | |
| 1140 | __debug_regs->dbdr[1][1] = 0; | |
| 1141 | ||
| 1da177e4 LT |
1142 | asm volatile(" movgs gr0,dbar1 \n" |
| 1143 | " movgs gr0,dbmr10 \n" | |
| 1144 | " movgs gr0,dbmr11 \n" | |
| 1145 | " movgs gr0,dbdr10 \n" | |
| 1146 | " movgs gr0,dbdr11 \n"); | |
| 1147 | return 0; | |
| 1148 | ||
| 1149 | skip_dbar1: | |
| 1150 | return -ENOSPC; | |
| 1151 | ||
| 1152 | default: | |
| 1153 | return -EINVAL; | |
| 1154 | } | |
| 1155 | } /* end gdbstub_clear_breakpoint() */ | |
| 1156 | ||
| 1157 | /*****************************************************************************/ | |
| 1158 | /* | |
| 1159 | * check a for an internal software breakpoint, and wind the PC back if necessary | |
| 1160 | */ | |
| 1161 | static void gdbstub_check_breakpoint(void) | |
| 1162 | { | |
| 1163 | unsigned long addr = __debug_frame->pc - 4; | |
| 1164 | int bkpt; | |
| 1165 | ||
| 1166 | for (bkpt = 255; bkpt >= 0; bkpt--) | |
| 1167 | if (gdbstub_bkpts[bkpt].addr == addr) | |
| 1168 | break; | |
| 1169 | if (bkpt >= 0) | |
| 1170 | __debug_frame->pc = addr; | |
| 1171 | ||
| 1172 | //gdbstub_printk("alter pc [%d] %08lx\n", bkpt, __debug_frame->pc); | |
| 1173 | ||
| 1174 | } /* end gdbstub_check_breakpoint() */ | |
| 1175 | ||
| 1176 | /*****************************************************************************/ | |
| 1177 | /* | |
| 1178 | * | |
| 1179 | */ | |
| 0a9d6e7c | 1180 | static void __maybe_unused gdbstub_show_regs(void) |
| 1da177e4 | 1181 | { |
| 84e8cd6d | 1182 | unsigned long *reg; |
| 1da177e4 LT |
1183 | int loop; |
| 1184 | ||
| 1185 | gdbstub_printk("\n"); | |
| 1186 | ||
| 1187 | gdbstub_printk("Frame: @%p [%s]\n", | |
| 1188 | __debug_frame, | |
| 1189 | __debug_frame->psr & PSR_S ? "kernel" : "user"); | |
| 1190 | ||
| 84e8cd6d DH |
1191 | reg = (unsigned long *) __debug_frame; |
| 1192 | for (loop = 0; loop < NR_PT_REGS; loop++) { | |
| 1193 | printk("%s %08lx", regnames[loop + 0], reg[loop + 0]); | |
| 1da177e4 | 1194 | |
| 84e8cd6d | 1195 | if (loop == NR_PT_REGS - 1 || loop % 5 == 4) |
| 1da177e4 LT |
1196 | printk("\n"); |
| 1197 | else | |
| 1198 | printk(" | "); | |
| 1199 | } | |
| 1200 | ||
| 1201 | gdbstub_printk("Process %s (pid: %d)\n", current->comm, current->pid); | |
| 1202 | } /* end gdbstub_show_regs() */ | |
| 1203 | ||
| 1204 | /*****************************************************************************/ | |
| 1205 | /* | |
| 1206 | * dump debugging regs | |
| 1207 | */ | |
| 0a9d6e7c | 1208 | static void __maybe_unused gdbstub_dump_debugregs(void) |
| 1da177e4 | 1209 | { |
| 84e8cd6d DH |
1210 | gdbstub_printk("DCR %08lx ", __debug_status.dcr); |
| 1211 | gdbstub_printk("BRR %08lx\n", __debug_status.brr); | |
| 1da177e4 LT |
1212 | |
| 1213 | gdbstub_printk("IBAR0 %08lx ", __get_ibar(0)); | |
| 1214 | gdbstub_printk("IBAR1 %08lx ", __get_ibar(1)); | |
| 1215 | gdbstub_printk("IBAR2 %08lx ", __get_ibar(2)); | |
| 1216 | gdbstub_printk("IBAR3 %08lx\n", __get_ibar(3)); | |
| 1217 | ||
| 1218 | gdbstub_printk("DBAR0 %08lx ", __get_dbar(0)); | |
| 1219 | gdbstub_printk("DBMR00 %08lx ", __get_dbmr0(0)); | |
| 1220 | gdbstub_printk("DBMR01 %08lx\n", __get_dbmr1(0)); | |
| 1221 | ||
| 1222 | gdbstub_printk("DBAR1 %08lx ", __get_dbar(1)); | |
| 1223 | gdbstub_printk("DBMR10 %08lx ", __get_dbmr0(1)); | |
| 1224 | gdbstub_printk("DBMR11 %08lx\n", __get_dbmr1(1)); | |
| 1225 | ||
| 1226 | gdbstub_printk("\n"); | |
| 1227 | } /* end gdbstub_dump_debugregs() */ | |
| 1228 | ||
| 1229 | /*****************************************************************************/ | |
| 1230 | /* | |
| 1231 | * dump the MMU state into a structure so that it can be accessed with GDB | |
| 1232 | */ | |
| 1233 | void gdbstub_get_mmu_state(void) | |
| 1234 | { | |
| 1235 | asm volatile("movsg hsr0,%0" : "=r"(__debug_mmu.regs.hsr0)); | |
| 1236 | asm volatile("movsg pcsr,%0" : "=r"(__debug_mmu.regs.pcsr)); | |
| 1237 | asm volatile("movsg esr0,%0" : "=r"(__debug_mmu.regs.esr0)); | |
| 1238 | asm volatile("movsg ear0,%0" : "=r"(__debug_mmu.regs.ear0)); | |
| 1239 | asm volatile("movsg epcr0,%0" : "=r"(__debug_mmu.regs.epcr0)); | |
| 1240 | ||
| 1241 | /* read the protection / SAT registers */ | |
| 1242 | __debug_mmu.iamr[0].L = __get_IAMLR(0); | |
| 1243 | __debug_mmu.iamr[0].P = __get_IAMPR(0); | |
| 1244 | __debug_mmu.iamr[1].L = __get_IAMLR(1); | |
| 1245 | __debug_mmu.iamr[1].P = __get_IAMPR(1); | |
| 1246 | __debug_mmu.iamr[2].L = __get_IAMLR(2); | |
| 1247 | __debug_mmu.iamr[2].P = __get_IAMPR(2); | |
| 1248 | __debug_mmu.iamr[3].L = __get_IAMLR(3); | |
| 1249 | __debug_mmu.iamr[3].P = __get_IAMPR(3); | |
| 1250 | __debug_mmu.iamr[4].L = __get_IAMLR(4); | |
| 1251 | __debug_mmu.iamr[4].P = __get_IAMPR(4); | |
| 1252 | __debug_mmu.iamr[5].L = __get_IAMLR(5); | |
| 1253 | __debug_mmu.iamr[5].P = __get_IAMPR(5); | |
| 1254 | __debug_mmu.iamr[6].L = __get_IAMLR(6); | |
| 1255 | __debug_mmu.iamr[6].P = __get_IAMPR(6); | |
| 1256 | __debug_mmu.iamr[7].L = __get_IAMLR(7); | |
| 1257 | __debug_mmu.iamr[7].P = __get_IAMPR(7); | |
| 1258 | __debug_mmu.iamr[8].L = __get_IAMLR(8); | |
| 1259 | __debug_mmu.iamr[8].P = __get_IAMPR(8); | |
| 1260 | __debug_mmu.iamr[9].L = __get_IAMLR(9); | |
| 1261 | __debug_mmu.iamr[9].P = __get_IAMPR(9); | |
| 1262 | __debug_mmu.iamr[10].L = __get_IAMLR(10); | |
| 1263 | __debug_mmu.iamr[10].P = __get_IAMPR(10); | |
| 1264 | __debug_mmu.iamr[11].L = __get_IAMLR(11); | |
| 1265 | __debug_mmu.iamr[11].P = __get_IAMPR(11); | |
| 1266 | __debug_mmu.iamr[12].L = __get_IAMLR(12); | |
| 1267 | __debug_mmu.iamr[12].P = __get_IAMPR(12); | |
| 1268 | __debug_mmu.iamr[13].L = __get_IAMLR(13); | |
| 1269 | __debug_mmu.iamr[13].P = __get_IAMPR(13); | |
| 1270 | __debug_mmu.iamr[14].L = __get_IAMLR(14); | |
| 1271 | __debug_mmu.iamr[14].P = __get_IAMPR(14); | |
| 1272 | __debug_mmu.iamr[15].L = __get_IAMLR(15); | |
| 1273 | __debug_mmu.iamr[15].P = __get_IAMPR(15); | |
| 1274 | ||
| 1275 | __debug_mmu.damr[0].L = __get_DAMLR(0); | |
| 1276 | __debug_mmu.damr[0].P = __get_DAMPR(0); | |
| 1277 | __debug_mmu.damr[1].L = __get_DAMLR(1); | |
| 1278 | __debug_mmu.damr[1].P = __get_DAMPR(1); | |
| 1279 | __debug_mmu.damr[2].L = __get_DAMLR(2); | |
| 1280 | __debug_mmu.damr[2].P = __get_DAMPR(2); | |
| 1281 | __debug_mmu.damr[3].L = __get_DAMLR(3); | |
| 1282 | __debug_mmu.damr[3].P = __get_DAMPR(3); | |
| 1283 | __debug_mmu.damr[4].L = __get_DAMLR(4); | |
| 1284 | __debug_mmu.damr[4].P = __get_DAMPR(4); | |
| 1285 | __debug_mmu.damr[5].L = __get_DAMLR(5); | |
| 1286 | __debug_mmu.damr[5].P = __get_DAMPR(5); | |
| 1287 | __debug_mmu.damr[6].L = __get_DAMLR(6); | |
| 1288 | __debug_mmu.damr[6].P = __get_DAMPR(6); | |
| 1289 | __debug_mmu.damr[7].L = __get_DAMLR(7); | |
| 1290 | __debug_mmu.damr[7].P = __get_DAMPR(7); | |
| 1291 | __debug_mmu.damr[8].L = __get_DAMLR(8); | |
| 1292 | __debug_mmu.damr[8].P = __get_DAMPR(8); | |
| 1293 | __debug_mmu.damr[9].L = __get_DAMLR(9); | |
| 1294 | __debug_mmu.damr[9].P = __get_DAMPR(9); | |
| 1295 | __debug_mmu.damr[10].L = __get_DAMLR(10); | |
| 1296 | __debug_mmu.damr[10].P = __get_DAMPR(10); | |
| 1297 | __debug_mmu.damr[11].L = __get_DAMLR(11); | |
| 1298 | __debug_mmu.damr[11].P = __get_DAMPR(11); | |
| 1299 | __debug_mmu.damr[12].L = __get_DAMLR(12); | |
| 1300 | __debug_mmu.damr[12].P = __get_DAMPR(12); | |
| 1301 | __debug_mmu.damr[13].L = __get_DAMLR(13); | |
| 1302 | __debug_mmu.damr[13].P = __get_DAMPR(13); | |
| 1303 | __debug_mmu.damr[14].L = __get_DAMLR(14); | |
| 1304 | __debug_mmu.damr[14].P = __get_DAMPR(14); | |
| 1305 | __debug_mmu.damr[15].L = __get_DAMLR(15); | |
| 1306 | __debug_mmu.damr[15].P = __get_DAMPR(15); | |
| 1307 | ||
| 1308 | #ifdef CONFIG_MMU | |
| 1309 | do { | |
| 1310 | /* read the DAT entries from the TLB */ | |
| 1311 | struct __debug_amr *p; | |
| 1312 | int loop; | |
| 1313 | ||
| 1314 | asm volatile("movsg tplr,%0" : "=r"(__debug_mmu.regs.tplr)); | |
| 1315 | asm volatile("movsg tppr,%0" : "=r"(__debug_mmu.regs.tppr)); | |
| 1316 | asm volatile("movsg tpxr,%0" : "=r"(__debug_mmu.regs.tpxr)); | |
| 1317 | asm volatile("movsg cxnr,%0" : "=r"(__debug_mmu.regs.cxnr)); | |
| 1318 | ||
| 1319 | p = __debug_mmu.tlb; | |
| 1320 | ||
| 1321 | /* way 0 */ | |
| 1322 | asm volatile("movgs %0,tpxr" :: "r"(0 << TPXR_WAY_SHIFT)); | |
| 1323 | for (loop = 0; loop < 64; loop++) { | |
| 1324 | asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT)); | |
| 1325 | asm volatile("movsg tplr,%0" : "=r"(p->L)); | |
| 1326 | asm volatile("movsg tppr,%0" : "=r"(p->P)); | |
| 1327 | p++; | |
| 1328 | } | |
| 1329 | ||
| 1330 | /* way 1 */ | |
| 1331 | asm volatile("movgs %0,tpxr" :: "r"(1 << TPXR_WAY_SHIFT)); | |
| 1332 | for (loop = 0; loop < 64; loop++) { | |
| 1333 | asm volatile("tlbpr %0,gr0,#1,#0" :: "r"(loop << PAGE_SHIFT)); | |
| 1334 | asm volatile("movsg tplr,%0" : "=r"(p->L)); | |
| 1335 | asm volatile("movsg tppr,%0" : "=r"(p->P)); | |
| 1336 | p++; | |
| 1337 | } | |
| 1338 | ||
| 1339 | asm volatile("movgs %0,tplr" :: "r"(__debug_mmu.regs.tplr)); | |
| 1340 | asm volatile("movgs %0,tppr" :: "r"(__debug_mmu.regs.tppr)); | |
| 1341 | asm volatile("movgs %0,tpxr" :: "r"(__debug_mmu.regs.tpxr)); | |
| 1342 | } while(0); | |
| 1343 | #endif | |
| 1344 | ||
| 1345 | } /* end gdbstub_get_mmu_state() */ | |
| 1346 | ||
| 1347 | /*****************************************************************************/ | |
| 1348 | /* | |
| 1349 | * handle event interception and GDB remote protocol processing | |
| 1350 | * - on entry: | |
| 1351 | * PSR.ET==0, PSR.S==1 and the CPU is in debug mode | |
| 1352 | * __debug_frame points to the saved registers | |
| 1353 | * __frame points to the kernel mode exception frame, if it was in kernel | |
| 1354 | * mode when the break happened | |
| 1355 | */ | |
| 1356 | void gdbstub(int sigval) | |
| 1357 | { | |
| 1358 | unsigned long addr, length, loop, dbar, temp, temp2, temp3; | |
| 1359 | uint32_t zero; | |
| 1360 | char *ptr; | |
| 1361 | int flush_cache = 0; | |
| 1362 | ||
| 1363 | LEDS(0x5000); | |
| 1364 | ||
| 1365 | if (sigval < 0) { | |
| 1366 | #ifndef CONFIG_GDBSTUB_IMMEDIATE | |
| 1367 | /* return immediately if GDB immediate activation option not set */ | |
| 1368 | return; | |
| 1369 | #else | |
| 1370 | sigval = SIGINT; | |
| 1371 | #endif | |
| 1372 | } | |
| 1373 | ||
| 84e8cd6d | 1374 | save_user_regs(&__debug_frame0->uc); |
| 1da177e4 LT |
1375 | |
| 1376 | #if 0 | |
| 1377 | gdbstub_printk("--> gdbstub() %08x %p %08x %08x\n", | |
| 1378 | __debug_frame->pc, | |
| 1379 | __debug_frame, | |
| 1380 | __debug_regs->brr, | |
| 1381 | __debug_regs->bpsr); | |
| 1382 | // gdbstub_show_regs(); | |
| 1383 | #endif | |
| 1384 | ||
| 1385 | LEDS(0x5001); | |
| 1386 | ||
| 1387 | /* if we were interrupted by input on the serial gdbstub serial port, | |
| 1388 | * restore the context prior to the interrupt so that we return to that | |
| 1389 | * directly | |
| 1390 | */ | |
| 1391 | temp = (unsigned long) __entry_kerneltrap_table; | |
| 1392 | temp2 = (unsigned long) __entry_usertrap_table; | |
| 1393 | temp3 = __debug_frame->pc & ~15; | |
| 1394 | ||
| 1395 | if (temp3 == temp + TBR_TT_INTERRUPT_15 || | |
| 1396 | temp3 == temp2 + TBR_TT_INTERRUPT_15 | |
| 1397 | ) { | |
| 1398 | asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc)); | |
| 1399 | __debug_frame->psr |= PSR_ET; | |
| 1400 | __debug_frame->psr &= ~PSR_S; | |
| 1401 | if (__debug_frame->psr & PSR_PS) | |
| 1402 | __debug_frame->psr |= PSR_S; | |
| 84e8cd6d DH |
1403 | __debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12; |
| 1404 | __debug_status.brr |= BRR_EB; | |
| 1da177e4 LT |
1405 | sigval = SIGINT; |
| 1406 | } | |
| 1407 | ||
| 1408 | /* handle the decrement timer going off (FR451 only) */ | |
| 1409 | if (temp3 == temp + TBR_TT_DECREMENT_TIMER || | |
| 1410 | temp3 == temp2 + TBR_TT_DECREMENT_TIMER | |
| 1411 | ) { | |
| 1412 | asm volatile("movgs %0,timerd" :: "r"(10000000)); | |
| 1413 | asm volatile("movsg pcsr,%0" : "=r"(__debug_frame->pc)); | |
| 1414 | __debug_frame->psr |= PSR_ET; | |
| 1415 | __debug_frame->psr &= ~PSR_S; | |
| 1416 | if (__debug_frame->psr & PSR_PS) | |
| 1417 | __debug_frame->psr |= PSR_S; | |
| 84e8cd6d DH |
1418 | __debug_status.brr = (__debug_frame->tbr & TBR_TT) << 12; |
| 1419 | __debug_status.brr |= BRR_EB; | |
| 53b3531b | 1420 | sigval = SIGXCPU; |
| 1da177e4 LT |
1421 | } |
| 1422 | ||
| 1423 | LEDS(0x5002); | |
| 1424 | ||
| 1425 | /* after a BREAK insn, the PC lands on the far side of it */ | |
| 84e8cd6d | 1426 | if (__debug_status.brr & BRR_SB) |
| 1da177e4 LT |
1427 | gdbstub_check_breakpoint(); |
| 1428 | ||
| 1429 | LEDS(0x5003); | |
| 1430 | ||
| 1431 | /* handle attempts to write console data via GDB "O" commands */ | |
| 1432 | if (__debug_frame->pc == (unsigned long) gdbstub_console_write + 4) { | |
| 1433 | __gdbstub_console_write((struct console *) __debug_frame->gr8, | |
| 1434 | (const char *) __debug_frame->gr9, | |
| 1435 | (unsigned) __debug_frame->gr10); | |
| 1436 | goto done; | |
| 1437 | } | |
| 1438 | ||
| 1439 | if (gdbstub_rx_unget) { | |
| 1440 | sigval = SIGINT; | |
| 1441 | goto packet_waiting; | |
| 1442 | } | |
| 1443 | ||
| 1444 | if (!sigval) | |
| 84e8cd6d | 1445 | sigval = gdbstub_compute_signal(__debug_status.brr); |
| 1da177e4 LT |
1446 | |
| 1447 | LEDS(0x5004); | |
| 1448 | ||
| 1449 | /* send a message to the debugger's user saying what happened if it may | |
| 1450 | * not be clear cut (we can't map exceptions onto signals properly) | |
| 1451 | */ | |
| 1452 | if (sigval != SIGINT && sigval != SIGTRAP && sigval != SIGILL) { | |
| 1453 | static const char title[] = "Break "; | |
| 1454 | static const char crlf[] = "\r\n"; | |
| 84e8cd6d | 1455 | unsigned long brr = __debug_status.brr; |
| 1da177e4 LT |
1456 | char hx; |
| 1457 | ||
| 1458 | ptr = output_buffer; | |
| 1459 | *ptr++ = 'O'; | |
| 1460 | ptr = mem2hex(title, ptr, sizeof(title) - 1,0); | |
| 1461 | ||
| 19caeed6 HH |
1462 | hx = hex_asc_hi(brr >> 24); |
| 1463 | ptr = pack_hex_byte(ptr, hx); | |
| 1464 | hx = hex_asc_lo(brr >> 24); | |
| 1465 | ptr = pack_hex_byte(ptr, hx); | |
| 1466 | hx = hex_asc_hi(brr >> 16); | |
| 1467 | ptr = pack_hex_byte(ptr, hx); | |
| 1468 | hx = hex_asc_lo(brr >> 16); | |
| 1469 | ptr = pack_hex_byte(ptr, hx); | |
| 1470 | hx = hex_asc_hi(brr >> 8); | |
| 1471 | ptr = pack_hex_byte(ptr, hx); | |
| 1472 | hx = hex_asc_lo(brr >> 8); | |
| 1473 | ptr = pack_hex_byte(ptr, hx); | |
| 1474 | hx = hex_asc_hi(brr); | |
| 1475 | ptr = pack_hex_byte(ptr, hx); | |
| 1476 | hx = hex_asc_lo(brr); | |
| 1477 | ptr = pack_hex_byte(ptr, hx); | |
| 1da177e4 LT |
1478 | |
| 1479 | ptr = mem2hex(crlf, ptr, sizeof(crlf) - 1, 0); | |
| 1480 | *ptr = 0; | |
| 1481 | gdbstub_send_packet(output_buffer); /* send it off... */ | |
| 1482 | } | |
| 1483 | ||
| 1484 | LEDS(0x5005); | |
| 1485 | ||
| 1486 | /* tell the debugger that an exception has occurred */ | |
| 1487 | ptr = output_buffer; | |
| 1488 | ||
| 1489 | /* Send trap type (converted to signal) */ | |
| 1490 | *ptr++ = 'T'; | |
| 19caeed6 | 1491 | ptr = pack_hex_byte(ptr, sigval); |
| 1da177e4 LT |
1492 | |
| 1493 | /* Send Error PC */ | |
| 19caeed6 | 1494 | ptr = pack_hex_byte(ptr, GDB_REG_PC); |
| 1da177e4 LT |
1495 | *ptr++ = ':'; |
| 1496 | ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0); | |
| 1497 | *ptr++ = ';'; | |
| 1498 | ||
| 1499 | /* | |
| 1500 | * Send frame pointer | |
| 1501 | */ | |
| 19caeed6 | 1502 | ptr = pack_hex_byte(ptr, GDB_REG_FP); |
| 1da177e4 LT |
1503 | *ptr++ = ':'; |
| 1504 | ptr = mem2hex(&__debug_frame->fp, ptr, 4, 0); | |
| 1505 | *ptr++ = ';'; | |
| 1506 | ||
| 1507 | /* | |
| 1508 | * Send stack pointer | |
| 1509 | */ | |
| 19caeed6 | 1510 | ptr = pack_hex_byte(ptr, GDB_REG_SP); |
| 1da177e4 LT |
1511 | *ptr++ = ':'; |
| 1512 | ptr = mem2hex(&__debug_frame->sp, ptr, 4, 0); | |
| 1513 | *ptr++ = ';'; | |
| 1514 | ||
| 1515 | *ptr++ = 0; | |
| 1516 | gdbstub_send_packet(output_buffer); /* send it off... */ | |
| 1517 | ||
| 1518 | LEDS(0x5006); | |
| 1519 | ||
| 1520 | packet_waiting: | |
| 1521 | gdbstub_get_mmu_state(); | |
| 1522 | ||
| 1523 | /* wait for input from remote GDB */ | |
| 1524 | while (1) { | |
| 1525 | output_buffer[0] = 0; | |
| 1526 | ||
| 1527 | LEDS(0x5007); | |
| 1528 | gdbstub_recv_packet(input_buffer); | |
| 1529 | LEDS(0x5600 | input_buffer[0]); | |
| 1530 | ||
| 1531 | switch (input_buffer[0]) { | |
| 1532 | /* request repeat of last signal number */ | |
| 1533 | case '?': | |
| 1534 | output_buffer[0] = 'S'; | |
| 19caeed6 HH |
1535 | output_buffer[1] = hex_asc_hi(sigval); |
| 1536 | output_buffer[2] = hex_asc_lo(sigval); | |
| 1da177e4 LT |
1537 | output_buffer[3] = 0; |
| 1538 | break; | |
| 1539 | ||
| 1540 | case 'd': | |
| 1541 | /* toggle debug flag */ | |
| 1542 | break; | |
| 1543 | ||
| 1544 | /* return the value of the CPU registers | |
| 1545 | * - GR0, GR1, GR2, GR3, GR4, GR5, GR6, GR7, | |
| 1546 | * - GR8, GR9, GR10, GR11, GR12, GR13, GR14, GR15, | |
| 1547 | * - GR16, GR17, GR18, GR19, GR20, GR21, GR22, GR23, | |
| 1548 | * - GR24, GR25, GR26, GR27, GR28, GR29, GR30, GR31, | |
| 1549 | * - GR32, GR33, GR34, GR35, GR36, GR37, GR38, GR39, | |
| 1550 | * - GR40, GR41, GR42, GR43, GR44, GR45, GR46, GR47, | |
| 1551 | * - GR48, GR49, GR50, GR51, GR52, GR53, GR54, GR55, | |
| 1552 | * - GR56, GR57, GR58, GR59, GR60, GR61, GR62, GR63, | |
| 1553 | * - FP0, FP1, FP2, FP3, FP4, FP5, FP6, FP7, | |
| 1554 | * - FP8, FP9, FP10, FP11, FP12, FP13, FP14, FP15, | |
| 1555 | * - FP16, FP17, FP18, FP19, FP20, FP21, FP22, FP23, | |
| 1556 | * - FP24, FP25, FP26, FP27, FP28, FP29, FP30, FP31, | |
| 1557 | * - FP32, FP33, FP34, FP35, FP36, FP37, FP38, FP39, | |
| 1558 | * - FP40, FP41, FP42, FP43, FP44, FP45, FP46, FP47, | |
| 1559 | * - FP48, FP49, FP50, FP51, FP52, FP53, FP54, FP55, | |
| 1560 | * - FP56, FP57, FP58, FP59, FP60, FP61, FP62, FP63, | |
| 1561 | * - PC, PSR, CCR, CCCR, | |
| 1562 | * - _X132, _X133, _X134 | |
| 1563 | * - TBR, BRR, DBAR0, DBAR1, DBAR2, DBAR3, | |
| 1564 | * - _X141, _X142, _X143, _X144, | |
| 1565 | * - LR, LCR | |
| 1566 | */ | |
| 1567 | case 'g': | |
| 1568 | zero = 0; | |
| 1569 | ptr = output_buffer; | |
| 1570 | ||
| 1571 | /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */ | |
| 1572 | ptr = mem2hex(&zero, ptr, 4, 0); | |
| 1573 | ||
| 1574 | for (loop = 1; loop <= 27; loop++) | |
| 84e8cd6d | 1575 | ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0); |
| 1da177e4 LT |
1576 | temp = (unsigned long) __frame; |
| 1577 | ptr = mem2hex(&temp, ptr, 4, 0); | |
| 84e8cd6d DH |
1578 | ptr = mem2hex(&__debug_user_context->i.gr[29], ptr, 4, 0); |
| 1579 | ptr = mem2hex(&__debug_user_context->i.gr[30], ptr, 4, 0); | |
| 1da177e4 | 1580 | #ifdef CONFIG_MMU |
| 84e8cd6d | 1581 | ptr = mem2hex(&__debug_user_context->i.gr[31], ptr, 4, 0); |
| 1da177e4 LT |
1582 | #else |
| 1583 | temp = (unsigned long) __debug_frame; | |
| 1584 | ptr = mem2hex(&temp, ptr, 4, 0); | |
| 1585 | #endif | |
| 1586 | ||
| 1587 | for (loop = 32; loop <= 63; loop++) | |
| 84e8cd6d | 1588 | ptr = mem2hex(&__debug_user_context->i.gr[loop], ptr, 4, 0); |
| 1da177e4 LT |
1589 | |
| 1590 | /* deal with FR0-FR63 */ | |
| 1591 | for (loop = 0; loop <= 63; loop++) | |
| 84e8cd6d | 1592 | ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0); |
| 1da177e4 LT |
1593 | |
| 1594 | /* deal with special registers */ | |
| 1595 | ptr = mem2hex(&__debug_frame->pc, ptr, 4, 0); | |
| 1596 | ptr = mem2hex(&__debug_frame->psr, ptr, 4, 0); | |
| 1597 | ptr = mem2hex(&__debug_frame->ccr, ptr, 4, 0); | |
| 1598 | ptr = mem2hex(&__debug_frame->cccr, ptr, 4, 0); | |
| 1599 | ptr = mem2hex(&zero, ptr, 4, 0); | |
| 1600 | ptr = mem2hex(&zero, ptr, 4, 0); | |
| 1601 | ptr = mem2hex(&zero, ptr, 4, 0); | |
| 1602 | ptr = mem2hex(&__debug_frame->tbr, ptr, 4, 0); | |
| 84e8cd6d | 1603 | ptr = mem2hex(&__debug_status.brr , ptr, 4, 0); |
| 1da177e4 LT |
1604 | |
| 1605 | asm volatile("movsg dbar0,%0" : "=r"(dbar)); | |
| 1606 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1607 | asm volatile("movsg dbar1,%0" : "=r"(dbar)); | |
| 1608 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1609 | asm volatile("movsg dbar2,%0" : "=r"(dbar)); | |
| 1610 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1611 | asm volatile("movsg dbar3,%0" : "=r"(dbar)); | |
| 1612 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1613 | ||
| 1614 | asm volatile("movsg scr0,%0" : "=r"(dbar)); | |
| 1615 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1616 | asm volatile("movsg scr1,%0" : "=r"(dbar)); | |
| 1617 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1618 | asm volatile("movsg scr2,%0" : "=r"(dbar)); | |
| 1619 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1620 | asm volatile("movsg scr3,%0" : "=r"(dbar)); | |
| 1621 | ptr = mem2hex(&dbar, ptr, 4, 0); | |
| 1622 | ||
| 1623 | ptr = mem2hex(&__debug_frame->lr, ptr, 4, 0); | |
| 1624 | ptr = mem2hex(&__debug_frame->lcr, ptr, 4, 0); | |
| 1625 | ||
| 1626 | ptr = mem2hex(&__debug_frame->iacc0, ptr, 8, 0); | |
| 1627 | ||
| 84e8cd6d | 1628 | ptr = mem2hex(&__debug_user_context->f.fsr[0], ptr, 4, 0); |
| 1da177e4 LT |
1629 | |
| 1630 | for (loop = 0; loop <= 7; loop++) | |
| 84e8cd6d | 1631 | ptr = mem2hex(&__debug_user_context->f.acc[loop], ptr, 4, 0); |
| 1da177e4 | 1632 | |
| 84e8cd6d | 1633 | ptr = mem2hex(&__debug_user_context->f.accg, ptr, 8, 0); |
| 1da177e4 LT |
1634 | |
| 1635 | for (loop = 0; loop <= 1; loop++) | |
| 84e8cd6d | 1636 | ptr = mem2hex(&__debug_user_context->f.msr[loop], ptr, 4, 0); |
| 1da177e4 LT |
1637 | |
| 1638 | ptr = mem2hex(&__debug_frame->gner0, ptr, 4, 0); | |
| 1639 | ptr = mem2hex(&__debug_frame->gner1, ptr, 4, 0); | |
| 1640 | ||
| 84e8cd6d DH |
1641 | ptr = mem2hex(&__debug_user_context->f.fner[0], ptr, 4, 0); |
| 1642 | ptr = mem2hex(&__debug_user_context->f.fner[1], ptr, 4, 0); | |
| 1da177e4 LT |
1643 | |
| 1644 | break; | |
| 1645 | ||
| 1646 | /* set the values of the CPU registers */ | |
| 1647 | case 'G': | |
| 1648 | ptr = &input_buffer[1]; | |
| 1649 | ||
| 1650 | /* deal with GR0, GR1-GR27, GR28-GR31, GR32-GR63 */ | |
| 1651 | ptr = hex2mem(ptr, &temp, 4); | |
| 1652 | ||
| 1653 | for (loop = 1; loop <= 27; loop++) | |
| 84e8cd6d | 1654 | ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4); |
| 1da177e4 LT |
1655 | |
| 1656 | ptr = hex2mem(ptr, &temp, 4); | |
| 1657 | __frame = (struct pt_regs *) temp; | |
| 1658 | ptr = hex2mem(ptr, &__debug_frame->gr29, 4); | |
| 1659 | ptr = hex2mem(ptr, &__debug_frame->gr30, 4); | |
| 1660 | #ifdef CONFIG_MMU | |
| 1661 | ptr = hex2mem(ptr, &__debug_frame->gr31, 4); | |
| 1662 | #else | |
| 1663 | ptr = hex2mem(ptr, &temp, 4); | |
| 1664 | #endif | |
| 1665 | ||
| 1666 | for (loop = 32; loop <= 63; loop++) | |
| 84e8cd6d | 1667 | ptr = hex2mem(ptr, &__debug_user_context->i.gr[loop], 4); |
| 1da177e4 LT |
1668 | |
| 1669 | /* deal with FR0-FR63 */ | |
| 1670 | for (loop = 0; loop <= 63; loop++) | |
| 84e8cd6d | 1671 | ptr = mem2hex(&__debug_user_context->f.fr[loop], ptr, 4, 0); |
| 1da177e4 LT |
1672 | |
| 1673 | /* deal with special registers */ | |
| 1674 | ptr = hex2mem(ptr, &__debug_frame->pc, 4); | |
| 1675 | ptr = hex2mem(ptr, &__debug_frame->psr, 4); | |
| 1676 | ptr = hex2mem(ptr, &__debug_frame->ccr, 4); | |
| 1677 | ptr = hex2mem(ptr, &__debug_frame->cccr,4); | |
| 1678 | ||
| 1679 | for (loop = 132; loop <= 140; loop++) | |
| 1680 | ptr = hex2mem(ptr, &temp, 4); | |
| 1681 | ||
| 1682 | ptr = hex2mem(ptr, &temp, 4); | |
| 1683 | asm volatile("movgs %0,scr0" :: "r"(temp)); | |
| 1684 | ptr = hex2mem(ptr, &temp, 4); | |
| 1685 | asm volatile("movgs %0,scr1" :: "r"(temp)); | |
| 1686 | ptr = hex2mem(ptr, &temp, 4); | |
| 1687 | asm volatile("movgs %0,scr2" :: "r"(temp)); | |
| 1688 | ptr = hex2mem(ptr, &temp, 4); | |
| 1689 | asm volatile("movgs %0,scr3" :: "r"(temp)); | |
| 1690 | ||
| 1691 | ptr = hex2mem(ptr, &__debug_frame->lr, 4); | |
| 1692 | ptr = hex2mem(ptr, &__debug_frame->lcr, 4); | |
| 1693 | ||
| 1694 | ptr = hex2mem(ptr, &__debug_frame->iacc0, 8); | |
| 1695 | ||
| 84e8cd6d | 1696 | ptr = hex2mem(ptr, &__debug_user_context->f.fsr[0], 4); |
| 1da177e4 LT |
1697 | |
| 1698 | for (loop = 0; loop <= 7; loop++) | |
| 84e8cd6d | 1699 | ptr = hex2mem(ptr, &__debug_user_context->f.acc[loop], 4); |
| 1da177e4 | 1700 | |
| 84e8cd6d | 1701 | ptr = hex2mem(ptr, &__debug_user_context->f.accg, 8); |
| 1da177e4 LT |
1702 | |
| 1703 | for (loop = 0; loop <= 1; loop++) | |
| 84e8cd6d | 1704 | ptr = hex2mem(ptr, &__debug_user_context->f.msr[loop], 4); |
| 1da177e4 LT |
1705 | |
| 1706 | ptr = hex2mem(ptr, &__debug_frame->gner0, 4); | |
| 1707 | ptr = hex2mem(ptr, &__debug_frame->gner1, 4); | |
| 1708 | ||
| 84e8cd6d DH |
1709 | ptr = hex2mem(ptr, &__debug_user_context->f.fner[0], 4); |
| 1710 | ptr = hex2mem(ptr, &__debug_user_context->f.fner[1], 4); | |
| 1da177e4 LT |
1711 | |
| 1712 | gdbstub_strcpy(output_buffer,"OK"); | |
| 1713 | break; | |
| 1714 | ||
| 1715 | /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */ | |
| 1716 | case 'm': | |
| 1717 | ptr = &input_buffer[1]; | |
| 1718 | ||
| 1719 | if (hexToInt(&ptr, &addr) && | |
| 1720 | *ptr++ == ',' && | |
| 1721 | hexToInt(&ptr, &length) | |
| 1722 | ) { | |
| 1723 | if (mem2hex((char *)addr, output_buffer, length, 1)) | |
| 1724 | break; | |
| 1725 | gdbstub_strcpy (output_buffer, "E03"); | |
| 1726 | } | |
| 1727 | else { | |
| 1728 | gdbstub_strcpy(output_buffer,"E01"); | |
| 1729 | } | |
| 1730 | break; | |
| 1731 | ||
| 1732 | /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */ | |
| 1733 | case 'M': | |
| 1734 | ptr = &input_buffer[1]; | |
| 1735 | ||
| 1736 | if (hexToInt(&ptr, &addr) && | |
| 1737 | *ptr++ == ',' && | |
| 1738 | hexToInt(&ptr, &length) && | |
| 1739 | *ptr++ == ':' | |
| 1740 | ) { | |
| 1741 | if (hex2mem(ptr, (char *)addr, length)) { | |
| 1742 | gdbstub_strcpy(output_buffer, "OK"); | |
| 1743 | } | |
| 1744 | else { | |
| 1745 | gdbstub_strcpy(output_buffer, "E03"); | |
| 1746 | } | |
| 1747 | } | |
| 1748 | else | |
| 1749 | gdbstub_strcpy(output_buffer, "E02"); | |
| 1750 | ||
| 1751 | flush_cache = 1; | |
| 1752 | break; | |
| 1753 | ||
| 1754 | /* PNN,=RRRRRRRR: Write value R to reg N return OK */ | |
| 1755 | case 'P': | |
| 1756 | ptr = &input_buffer[1]; | |
| 1757 | ||
| 1758 | if (!hexToInt(&ptr, &addr) || | |
| 1759 | *ptr++ != '=' || | |
| 1760 | !hexToInt(&ptr, &temp) | |
| 1761 | ) { | |
| 1762 | gdbstub_strcpy(output_buffer, "E01"); | |
| 1763 | break; | |
| 1764 | } | |
| 1765 | ||
| 1766 | temp2 = 1; | |
| 1767 | switch (addr) { | |
| 1768 | case GDB_REG_GR(0): | |
| 1769 | break; | |
| 1770 | case GDB_REG_GR(1) ... GDB_REG_GR(63): | |
| 84e8cd6d | 1771 | __debug_user_context->i.gr[addr - GDB_REG_GR(0)] = temp; |
| 1da177e4 LT |
1772 | break; |
| 1773 | case GDB_REG_FR(0) ... GDB_REG_FR(63): | |
| 84e8cd6d | 1774 | __debug_user_context->f.fr[addr - GDB_REG_FR(0)] = temp; |
| 1da177e4 LT |
1775 | break; |
| 1776 | case GDB_REG_PC: | |
| 84e8cd6d | 1777 | __debug_user_context->i.pc = temp; |
| 1da177e4 LT |
1778 | break; |
| 1779 | case GDB_REG_PSR: | |
| 84e8cd6d | 1780 | __debug_user_context->i.psr = temp; |
| 1da177e4 LT |
1781 | break; |
| 1782 | case GDB_REG_CCR: | |
| 84e8cd6d | 1783 | __debug_user_context->i.ccr = temp; |
| 1da177e4 LT |
1784 | break; |
| 1785 | case GDB_REG_CCCR: | |
| 84e8cd6d | 1786 | __debug_user_context->i.cccr = temp; |
| 1da177e4 LT |
1787 | break; |
| 1788 | case GDB_REG_BRR: | |
| 84e8cd6d | 1789 | __debug_status.brr = temp; |
| 1da177e4 LT |
1790 | break; |
| 1791 | case GDB_REG_LR: | |
| 84e8cd6d | 1792 | __debug_user_context->i.lr = temp; |
| 1da177e4 LT |
1793 | break; |
| 1794 | case GDB_REG_LCR: | |
| 84e8cd6d | 1795 | __debug_user_context->i.lcr = temp; |
| 1da177e4 LT |
1796 | break; |
| 1797 | case GDB_REG_FSR0: | |
| 84e8cd6d | 1798 | __debug_user_context->f.fsr[0] = temp; |
| 1da177e4 LT |
1799 | break; |
| 1800 | case GDB_REG_ACC(0) ... GDB_REG_ACC(7): | |
| 84e8cd6d | 1801 | __debug_user_context->f.acc[addr - GDB_REG_ACC(0)] = temp; |
| 1da177e4 LT |
1802 | break; |
| 1803 | case GDB_REG_ACCG(0): | |
| 84e8cd6d | 1804 | *(uint32_t *) &__debug_user_context->f.accg[0] = temp; |
| 1da177e4 LT |
1805 | break; |
| 1806 | case GDB_REG_ACCG(4): | |
| 84e8cd6d | 1807 | *(uint32_t *) &__debug_user_context->f.accg[4] = temp; |
| 1da177e4 LT |
1808 | break; |
| 1809 | case GDB_REG_MSR(0) ... GDB_REG_MSR(1): | |
| 84e8cd6d | 1810 | __debug_user_context->f.msr[addr - GDB_REG_MSR(0)] = temp; |
| 1da177e4 LT |
1811 | break; |
| 1812 | case GDB_REG_GNER(0) ... GDB_REG_GNER(1): | |
| 84e8cd6d | 1813 | __debug_user_context->i.gner[addr - GDB_REG_GNER(0)] = temp; |
| 1da177e4 LT |
1814 | break; |
| 1815 | case GDB_REG_FNER(0) ... GDB_REG_FNER(1): | |
| 84e8cd6d | 1816 | __debug_user_context->f.fner[addr - GDB_REG_FNER(0)] = temp; |
| 1da177e4 LT |
1817 | break; |
| 1818 | default: | |
| 1819 | temp2 = 0; | |
| 1820 | break; | |
| 1821 | } | |
| 1822 | ||
| 1823 | if (temp2) { | |
| 1824 | gdbstub_strcpy(output_buffer, "OK"); | |
| 1825 | } | |
| 1826 | else { | |
| 1827 | gdbstub_strcpy(output_buffer, "E02"); | |
| 1828 | } | |
| 1829 | break; | |
| 1830 | ||
| 1831 | /* cAA..AA Continue at address AA..AA(optional) */ | |
| 1832 | case 'c': | |
| 1833 | /* try to read optional parameter, pc unchanged if no parm */ | |
| 1834 | ptr = &input_buffer[1]; | |
| 1835 | if (hexToInt(&ptr, &addr)) | |
| 1836 | __debug_frame->pc = addr; | |
| 1837 | goto done; | |
| 1838 | ||
| 1839 | /* kill the program */ | |
| 1840 | case 'k' : | |
| 1841 | goto done; /* just continue */ | |
| 1842 | ||
| 1843 | ||
| 1844 | /* reset the whole machine (FIXME: system dependent) */ | |
| 1845 | case 'r': | |
| 1846 | break; | |
| 1847 | ||
| 1848 | ||
| 1849 | /* step to next instruction */ | |
| 1850 | case 's': | |
| 1851 | __debug_regs->dcr |= DCR_SE; | |
| 84e8cd6d | 1852 | __debug_status.dcr |= DCR_SE; |
| 1da177e4 LT |
1853 | goto done; |
| 1854 | ||
| 1855 | /* set baud rate (bBB) */ | |
| 1856 | case 'b': | |
| 1857 | ptr = &input_buffer[1]; | |
| 1858 | if (!hexToInt(&ptr, &temp)) { | |
| 1859 | gdbstub_strcpy(output_buffer,"B01"); | |
| 1860 | break; | |
| 1861 | } | |
| 1862 | ||
| 1863 | if (temp) { | |
| 1864 | /* ack before changing speed */ | |
| 1865 | gdbstub_send_packet("OK"); | |
| 1866 | gdbstub_set_baud(temp); | |
| 1867 | } | |
| 1868 | break; | |
| 1869 | ||
| 1870 | /* set breakpoint */ | |
| 1871 | case 'Z': | |
| 1872 | ptr = &input_buffer[1]; | |
| 1873 | ||
| 1874 | if (!hexToInt(&ptr,&temp) || *ptr++ != ',' || | |
| 1875 | !hexToInt(&ptr,&addr) || *ptr++ != ',' || | |
| 1876 | !hexToInt(&ptr,&length) | |
| 1877 | ) { | |
| 1878 | gdbstub_strcpy(output_buffer,"E01"); | |
| 1879 | break; | |
| 1880 | } | |
| 1881 | ||
| 1882 | if (temp >= 5) { | |
| 1883 | gdbstub_strcpy(output_buffer,"E03"); | |
| 1884 | break; | |
| 1885 | } | |
| 1886 | ||
| 1887 | if (gdbstub_set_breakpoint(temp, addr, length) < 0) { | |
| 1888 | gdbstub_strcpy(output_buffer,"E03"); | |
| 1889 | break; | |
| 1890 | } | |
| 1891 | ||
| 1892 | if (temp == 0) | |
| 1893 | flush_cache = 1; /* soft bkpt by modified memory */ | |
| 1894 | ||
| 1895 | gdbstub_strcpy(output_buffer,"OK"); | |
| 1896 | break; | |
| 1897 | ||
| 1898 | /* clear breakpoint */ | |
| 1899 | case 'z': | |
| 1900 | ptr = &input_buffer[1]; | |
| 1901 | ||
| 1902 | if (!hexToInt(&ptr,&temp) || *ptr++ != ',' || | |
| 1903 | !hexToInt(&ptr,&addr) || *ptr++ != ',' || | |
| 1904 | !hexToInt(&ptr,&length) | |
| 1905 | ) { | |
| 1906 | gdbstub_strcpy(output_buffer,"E01"); | |
| 1907 | break; | |
| 1908 | } | |
| 1909 | ||
| 1910 | if (temp >= 5) { | |
| 1911 | gdbstub_strcpy(output_buffer,"E03"); | |
| 1912 | break; | |
| 1913 | } | |
| 1914 | ||
| 1915 | if (gdbstub_clear_breakpoint(temp, addr, length) < 0) { | |
| 1916 | gdbstub_strcpy(output_buffer,"E03"); | |
| 1917 | break; | |
| 1918 | } | |
| 1919 | ||
| 1920 | if (temp == 0) | |
| 1921 | flush_cache = 1; /* soft bkpt by modified memory */ | |
| 1922 | ||
| 1923 | gdbstub_strcpy(output_buffer,"OK"); | |
| 1924 | break; | |
| 1925 | ||
| 1926 | default: | |
| 1927 | gdbstub_proto("### GDB Unsupported Cmd '%s'\n",input_buffer); | |
| 1928 | break; | |
| 1929 | } | |
| 1930 | ||
| 1931 | /* reply to the request */ | |
| 1932 | LEDS(0x5009); | |
| 1933 | gdbstub_send_packet(output_buffer); | |
| 1934 | } | |
| 1935 | ||
| 1936 | done: | |
| 84e8cd6d | 1937 | restore_user_regs(&__debug_frame0->uc); |
| 1da177e4 LT |
1938 | |
| 1939 | //gdbstub_dump_debugregs(); | |
| 1940 | //gdbstub_printk("<-- gdbstub() %08x\n", __debug_frame->pc); | |
| 1941 | ||
| 1942 | /* need to flush the instruction cache before resuming, as we may have | |
| 1943 | * deposited a breakpoint, and the icache probably has no way of | |
| 1944 | * knowing that a data ref to some location may have changed something | |
| 1945 | * that is in the instruction cache. NB: We flush both caches, just to | |
| 1946 | * be sure... | |
| 1947 | */ | |
| 1948 | ||
| 1949 | /* note: flushing the icache will clobber EAR0 on the FR451 */ | |
| 1950 | if (flush_cache) | |
| 1951 | gdbstub_purge_cache(); | |
| 1952 | ||
| 1953 | LEDS(0x5666); | |
| 1954 | ||
| 1955 | } /* end gdbstub() */ | |
| 1956 | ||
| 1957 | /*****************************************************************************/ | |
| 1958 | /* | |
| 1959 | * initialise the GDB stub | |
| 1960 | */ | |
| 1961 | void __init gdbstub_init(void) | |
| 1962 | { | |
| 1963 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
| 1964 | unsigned char ch; | |
| 1965 | int ret; | |
| 1966 | #endif | |
| 1967 | ||
| 1968 | gdbstub_printk("%s", gdbstub_banner); | |
| 1da177e4 LT |
1969 | |
| 1970 | gdbstub_io_init(); | |
| 1971 | ||
| 1972 | /* try to talk to GDB (or anyone insane enough to want to type GDB protocol by hand) */ | |
| 1973 | gdbstub_proto("### GDB Tx ACK\n"); | |
| 1974 | gdbstub_tx_char('+'); /* 'hello world' */ | |
| 1975 | ||
| 1976 | #ifdef CONFIG_GDBSTUB_IMMEDIATE | |
| 1977 | gdbstub_printk("GDB Stub waiting for packet\n"); | |
| 1978 | ||
| 1979 | /* | |
| 1980 | * In case GDB is started before us, ack any packets | |
| 1981 | * (presumably "$?#xx") sitting there. | |
| 1982 | */ | |
| 1983 | do { gdbstub_rx_char(&ch, 0); } while (ch != '$'); | |
| 1984 | do { gdbstub_rx_char(&ch, 0); } while (ch != '#'); | |
| 1985 | do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat first csum byte */ | |
| 1986 | do { ret = gdbstub_rx_char(&ch, 0); } while (ret != 0); /* eat second csum byte */ | |
| 1987 | ||
| 1988 | gdbstub_proto("### GDB Tx NAK\n"); | |
| 1989 | gdbstub_tx_char('-'); /* nak it */ | |
| 1990 | ||
| 1991 | #else | |
| 1992 | gdbstub_printk("GDB Stub set\n"); | |
| 1993 | #endif | |
| 1994 | ||
| 1995 | #if 0 | |
| 1996 | /* send banner */ | |
| 1997 | ptr = output_buffer; | |
| 1998 | *ptr++ = 'O'; | |
| 1999 | ptr = mem2hex(gdbstub_banner, ptr, sizeof(gdbstub_banner) - 1, 0); | |
| 2000 | gdbstub_send_packet(output_buffer); | |
| 2001 | #endif | |
| 76925916 | 2002 | #if defined(CONFIG_GDB_CONSOLE) && defined(CONFIG_GDBSTUB_IMMEDIATE) |
| 1da177e4 LT |
2003 | register_console(&gdbstub_console); |
| 2004 | #endif | |
| 2005 | ||
| 2006 | } /* end gdbstub_init() */ | |
| 2007 | ||
| 2008 | /*****************************************************************************/ | |
| 2009 | /* | |
| 2010 | * register the console at a more appropriate time | |
| 2011 | */ | |
| 76925916 | 2012 | #if defined (CONFIG_GDB_CONSOLE) && !defined(CONFIG_GDBSTUB_IMMEDIATE) |
| 1da177e4 LT |
2013 | static int __init gdbstub_postinit(void) |
| 2014 | { | |
| 2015 | printk("registering console\n"); | |
| 2016 | register_console(&gdbstub_console); | |
| 2017 | return 0; | |
| 2018 | } /* end gdbstub_postinit() */ | |
| 2019 | ||
| 2020 | __initcall(gdbstub_postinit); | |
| 2021 | #endif | |
| 2022 | ||
| 2023 | /*****************************************************************************/ | |
| 2024 | /* | |
| 2025 | * send an exit message to GDB | |
| 2026 | */ | |
| 2027 | void gdbstub_exit(int status) | |
| 2028 | { | |
| 2029 | unsigned char checksum; | |
| 2030 | int count; | |
| 2031 | unsigned char ch; | |
| 2032 | ||
| 2033 | sprintf(output_buffer,"W%02x",status&0xff); | |
| 2034 | ||
| 2035 | gdbstub_tx_char('$'); | |
| 2036 | checksum = 0; | |
| 2037 | count = 0; | |
| 2038 | ||
| 2039 | while ((ch = output_buffer[count]) != 0) { | |
| 2040 | gdbstub_tx_char(ch); | |
| 2041 | checksum += ch; | |
| 2042 | count += 1; | |
| 2043 | } | |
| 2044 | ||
| 2045 | gdbstub_tx_char('#'); | |
| 19caeed6 HH |
2046 | gdbstub_tx_char(hex_asc_hi(checksum)); |
| 2047 | gdbstub_tx_char(hex_asc_lo(checksum)); | |
| 1da177e4 LT |
2048 | |
| 2049 | /* make sure the output is flushed, or else RedBoot might clobber it */ | |
| 2050 | gdbstub_tx_char('-'); | |
| 2051 | gdbstub_tx_flush(); | |
| 2052 | ||
| 2053 | } /* end gdbstub_exit() */ | |
| 2054 | ||
| 2055 | /*****************************************************************************/ | |
| 2056 | /* | |
| 2057 | * GDB wants to call malloc() and free() to allocate memory for calling kernel | |
| 2058 | * functions directly from its command line | |
| 2059 | */ | |
| 0a9d6e7c | 2060 | static void *malloc(size_t size) __maybe_unused; |
| 1da177e4 LT |
2061 | static void *malloc(size_t size) |
| 2062 | { | |
| 2063 | return kmalloc(size, GFP_ATOMIC); | |
| 2064 | } | |
| 2065 | ||
| 0a9d6e7c | 2066 | static void free(void *p) __maybe_unused; |
| 1da177e4 LT |
2067 | static void free(void *p) |
| 2068 | { | |
| 2069 | kfree(p); | |
| 2070 | } | |
| 2071 | ||
| 0a9d6e7c | 2072 | static uint32_t ___get_HSR0(void) __maybe_unused; |
| 1da177e4 LT |
2073 | static uint32_t ___get_HSR0(void) |
| 2074 | { | |
| 2075 | return __get_HSR(0); | |
| 2076 | } | |
| 2077 | ||
| 0a9d6e7c | 2078 | static uint32_t ___set_HSR0(uint32_t x) __maybe_unused; |
| 1da177e4 LT |
2079 | static uint32_t ___set_HSR0(uint32_t x) |
| 2080 | { | |
| 2081 | __set_HSR(0, x); | |
| 2082 | return __get_HSR(0); | |
| 2083 | } |