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   1 /***************************************************************************
   2  *   Copyright (C) 2016 by Matthias Welwarsky                              *
   3  *   matthias.welwarsky@sysgo.com                                          *
   4  *                                                                         *
   5  *   Copyright (C) ST-Ericsson SA 2011 michel.jaouen@stericsson.com        *
   6  *                                                                         *
   7  *   This program is free software; you can redistribute it and/or modify  *
   8  *   it under the terms of the GNU General Public License as published by  *
   9  *   the Free Software Foundation; either version 2 of the License, or     *
  10  *   (at your option) any later version.                                   *
  11  *                                                                         *
  12  *   This program is distributed in the hope that it will be useful,       *
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  15  *   GNU General Public License for more details.                          *
  16  *                                                                         *
  17  *   You should have received a copy of the GNU General Public License     *
  18  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  19  ***************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <helper/binarybuffer.h>
  26 #include <helper/command.h>
  27
  28 #include "jtag/interface.h"
  29 #include "arm.h"
  30 #include "armv7a.h"
  31 #include "armv7a_mmu.h"
  32 #include "arm_opcodes.h"
  33 #include "cortex_a.h"
  34
  35 #define SCTLR_BIT_AFE (1 << 29)
  36
  37 /*  method adapted to Cortex-A : reused ARM v4 v5 method */
  38 int armv7a_mmu_translate_va(struct target *target,  uint32_t va, uint32_t *val)
  39 {
  40         uint32_t first_lvl_descriptor = 0x0;
  41         uint32_t second_lvl_descriptor = 0x0;
  42         int retval;
  43         struct armv7a_common *armv7a = target_to_armv7a(target);
  44         uint32_t ttbidx = 0;    /*  default to ttbr0 */
  45         uint32_t ttb_mask;
  46         uint32_t va_mask;
  47         uint32_t ttb;
  48
  49         if (target->state != TARGET_HALTED)
  50                 LOG_INFO("target not halted, using cached values for translation table!");
  51
  52         /* if va is above the range handled by ttbr0, select ttbr1 */
  53         if (va > armv7a->armv7a_mmu.ttbr_range[0]) {
  54                 /*  select ttb 1 */
  55                 ttbidx = 1;
  56         }
  57
  58         ttb = armv7a->armv7a_mmu.ttbr[ttbidx];
  59         ttb_mask = armv7a->armv7a_mmu.ttbr_mask[ttbidx];
  60         va_mask = 0xfff00000 & armv7a->armv7a_mmu.ttbr_range[ttbidx];
  61
  62         LOG_DEBUG("ttb_mask %" PRIx32 " va_mask %" PRIx32 " ttbidx %i",
  63                   ttb_mask, va_mask, ttbidx);
  64         retval = armv7a->armv7a_mmu.read_physical_memory(target,
  65                         (ttb & ttb_mask) | ((va & va_mask) >> 18),
  66                         4, 1, (uint8_t *)&first_lvl_descriptor);
  67         if (retval != ERROR_OK)
  68                 return retval;
  69         first_lvl_descriptor = target_buffer_get_u32(target, (uint8_t *)
  70                         &first_lvl_descriptor);
  71         /*  reuse armv4_5 piece of code, specific armv7a changes may come later */
  72         LOG_DEBUG("1st lvl desc: %8.8" PRIx32 "", first_lvl_descriptor);
  73
  74         if ((first_lvl_descriptor & 0x3) == 0) {
  75                 /* Avoid LOG_ERROR, probably GDB is guessing the stack frame */
  76                 LOG_WARNING("Address translation failure [1]: va %8.8" PRIx32 "", va);
  77                 return ERROR_TARGET_TRANSLATION_FAULT;
  78         }
  79
  80         if ((first_lvl_descriptor & 0x40002) == 2) {
  81                 /* section descriptor */
  82                 *val = (first_lvl_descriptor & 0xfff00000) | (va & 0x000fffff);
  83                 return ERROR_OK;
  84         } else if ((first_lvl_descriptor & 0x40002) == 0x40002) {
  85                 /* supersection descriptor */
  86                 if (first_lvl_descriptor & 0x00f001e0) {
  87                         LOG_ERROR("Physical address does not fit into 32 bits");
  88                         return ERROR_TARGET_TRANSLATION_FAULT;
  89                 }
  90                 *val = (first_lvl_descriptor & 0xff000000) | (va & 0x00ffffff);
  91                 return ERROR_OK;
  92         }
  93
  94         /* page table */
  95         retval = armv7a->armv7a_mmu.read_physical_memory(target,
  96                         (first_lvl_descriptor & 0xfffffc00) | ((va & 0x000ff000) >> 10),
  97                         4, 1, (uint8_t *)&second_lvl_descriptor);
  98         if (retval != ERROR_OK)
  99                 return retval;
 100
 101         second_lvl_descriptor = target_buffer_get_u32(target, (uint8_t *)
 102                         &second_lvl_descriptor);
 103
 104         LOG_DEBUG("2nd lvl desc: %8.8" PRIx32 "", second_lvl_descriptor);
 105
 106         if ((second_lvl_descriptor & 0x3) == 0) {
 107                 /* Avoid LOG_ERROR, probably GDB is guessing the stack frame */
 108                 LOG_WARNING("Address translation failure [2]: va %8.8" PRIx32 "", va);
 109                 return ERROR_TARGET_TRANSLATION_FAULT;
 110         }
 111
 112         if ((second_lvl_descriptor & 0x3) == 1) {
 113                 /* large page descriptor */
 114                 *val = (second_lvl_descriptor & 0xffff0000) | (va & 0x0000ffff);
 115         } else {
 116                 /* small page descriptor */
 117                 *val = (second_lvl_descriptor & 0xfffff000) | (va & 0x00000fff);
 118         }
 119
 120         return ERROR_OK;
 121 }
 122
 123 /*  V7 method VA TO PA  */
 124 int armv7a_mmu_translate_va_pa(struct target *target, uint32_t va,
 125         uint32_t *val, int meminfo)
 126 {
 127         int retval = ERROR_FAIL;
 128         struct armv7a_common *armv7a = target_to_armv7a(target);
 129         struct arm_dpm *dpm = armv7a->arm.dpm;
 130         uint32_t virt = va & ~0xfff;
 131         uint32_t NOS, NS, INNER, OUTER;
 132         *val = 0xdeadbeef;
 133         retval = dpm->prepare(dpm);
 134         if (retval != ERROR_OK)
 135                 goto done;
 136         /*  mmu must be enable in order to get a correct translation
 137          *  use VA to PA CP15 register for conversion */
 138         retval = dpm->instr_write_data_r0(dpm,
 139                         ARMV4_5_MCR(15, 0, 0, 7, 8, 0),
 140                         virt);
 141         if (retval != ERROR_OK)
 142                 goto done;
 143         retval = dpm->instr_read_data_r0(dpm,
 144                         ARMV4_5_MRC(15, 0, 0, 7, 4, 0),
 145                         val);
 146         /* decode memory attribute */
 147         NOS = (*val >> 10) & 1; /*  Not Outer shareable */
 148         NS = (*val >> 9) & 1;   /* Non secure */
 149         INNER = (*val >> 4) &  0x7;
 150         OUTER = (*val >> 2) & 0x3;
 151
 152         if (retval != ERROR_OK)
 153                 goto done;
 154         *val = (*val & ~0xfff)  +  (va & 0xfff);
 155         if (meminfo) {
 156                 LOG_INFO("%" PRIx32 " : %" PRIx32 " %s outer shareable %s secured",
 157                         va, *val,
 158                         NOS == 1 ? "not" : " ",
 159                         NS == 1 ? "not" : "");
 160                 switch (OUTER) {
 161                         case 0:
 162                                 LOG_INFO("outer: Non-Cacheable");
 163                                 break;
 164                         case 1:
 165                                 LOG_INFO("outer: Write-Back, Write-Allocate");
 166                                 break;
 167                         case 2:
 168                                 LOG_INFO("outer: Write-Through, No Write-Allocate");
 169                                 break;
 170                         case 3:
 171                                 LOG_INFO("outer: Write-Back, no Write-Allocate");
 172                                 break;
 173                 }
 174                 switch (INNER) {
 175                         case 0:
 176                                 LOG_INFO("inner: Non-Cacheable");
 177                                 break;
 178                         case 1:
 179                                 LOG_INFO("inner: Strongly-ordered");
 180                                 break;
 181                         case 3:
 182                                 LOG_INFO("inner: Device");
 183                                 break;
 184                         case 5:
 185                                 LOG_INFO("inner: Write-Back, Write-Allocate");
 186                                 break;
 187                         case 6:
 188                                 LOG_INFO("inner:  Write-Through");
 189                                 break;
 190                         case 7:
 191                                 LOG_INFO("inner: Write-Back, no Write-Allocate");
 192                                 break;
 193                         default:
 194                                 LOG_INFO("inner: %" PRIx32 " ???", INNER);
 195                 }
 196         }
 197
 198 done:
 199         dpm->finish(dpm);
 200
 201         return retval;
 202 }
 203
 204 static const char *desc_bits_to_string(bool c_bit, bool b_bit, bool s_bit, bool ap2, int ap10, bool afe)
 205 {
 206         static char bits_string[64];
 207         unsigned int len;
 208
 209         if (afe) {
 210                 bool acc_r = true;
 211                 bool acc_w = !ap2;
 212                 bool priv = !(ap10 & 2);
 213                 len = snprintf(bits_string, sizeof(bits_string), "%s%s%s access%s: %s%s",
 214                                            s_bit ? "S " : "", c_bit ? "C " : "", b_bit ? "B " : "",
 215                                  priv ? "(priv)" : "", acc_r ? "R" : "N", acc_w ? "W " : "O ");
 216         } else {
 217                 bool priv_acc_w = !ap2;
 218                 bool priv_acc_r = true;
 219                 bool unpriv_acc_w = priv_acc_w;
 220                 bool unpriv_acc_r = priv_acc_r;
 221
 222                 switch (ap10) {
 223                 case 0:
 224                         priv_acc_r = priv_acc_w = false;
 225                         unpriv_acc_r = unpriv_acc_w = false;
 226                         break;
 227                 case 1:
 228                         unpriv_acc_r = unpriv_acc_w = false;
 229                         break;
 230                 case 2:
 231                         unpriv_acc_w = false;
 232                         break;
 233                 default:
 234                         break;
 235                 }
 236
 237                 len = snprintf(bits_string, sizeof(bits_string), "%s%s%s access(priv): %s%s access(unpriv): %s%s",
 238                                 s_bit ? "S " : "", c_bit ? "C " : "", b_bit ? "B " : "", priv_acc_r ? "R" : "N", priv_acc_w ? "W" : "O",
 239                                 unpriv_acc_r ? "R" : "N", unpriv_acc_w ? "W" : "O");
 240         }
 241
 242         if (len >= sizeof(bits_string))
 243                 bits_string[63] = 0;
 244
 245         return bits_string;
 246 }
 247
 248 static const char *l2_desc_bits_to_string(uint32_t l2_desc, bool afe)
 249 {
 250         bool c_bit = !!(l2_desc & (1 << 3));
 251         bool b_bit = !!(l2_desc & (1 << 2));
 252         bool s_bit = !!(l2_desc & (1 << 10));
 253         bool ap2 = !!(l2_desc & (1 << 9));
 254         int ap10 = (l2_desc >> 4) & 3;
 255
 256         return desc_bits_to_string(c_bit, b_bit, s_bit, ap2, ap10, afe);
 257 }
 258
 259 static const char *l1_desc_bits_to_string(uint32_t l1_desc, bool afe)
 260 {
 261         bool c_bit = !!(l1_desc & (1 << 3));
 262         bool b_bit = !!(l1_desc & (1 << 2));
 263         bool s_bit = !!(l1_desc & (1 << 16));
 264         bool ap2 = !!(l1_desc & (1 << 15));
 265         int ap10 = (l1_desc >> 10) & 3;
 266
 267         return desc_bits_to_string(c_bit, b_bit, s_bit, ap2, ap10, afe);
 268 }
 269
 270 COMMAND_HANDLER(armv7a_mmu_dump_table)
 271 {
 272         struct target *target = get_current_target(CMD_CTX);
 273         struct cortex_a_common *cortex_a = target_to_cortex_a(target);
 274         struct armv7a_common *armv7a = target_to_armv7a(target);
 275         struct armv7a_mmu_common *mmu = &armv7a->armv7a_mmu;
 276         struct armv7a_cache_common *cache = &mmu->armv7a_cache;
 277         uint32_t *first_lvl_ptbl;
 278         target_addr_t ttb;
 279         int ttbidx = 0;
 280         int retval;
 281         int pt_idx;
 282         int max_pt_idx = 4095;
 283         bool afe;
 284
 285         if (CMD_ARGC < 1)
 286                 return ERROR_COMMAND_SYNTAX_ERROR;
 287
 288         if (!strcmp(CMD_ARGV[0], "addr")) {
 289                 if (CMD_ARGC < 2)
 290                         return ERROR_COMMAND_SYNTAX_ERROR;
 291
 292                 COMMAND_PARSE_NUMBER(target_addr, CMD_ARGV[1], ttb);
 293
 294                 if (CMD_ARGC > 2) {
 295                         COMMAND_PARSE_NUMBER(int, CMD_ARGV[2], max_pt_idx);
 296
 297                         if (max_pt_idx < 1 || max_pt_idx > 4096)
 298                                 return ERROR_COMMAND_ARGUMENT_INVALID;
 299                         max_pt_idx -= 1;
 300                 }
 301         } else {
 302                 if (mmu->cached != 1) {
 303                         LOG_ERROR("TTB not cached!");
 304                         return ERROR_FAIL;
 305                 }
 306
 307                 COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], ttbidx);
 308                 if (ttbidx < 0 || ttbidx > 1)
 309                         return ERROR_COMMAND_ARGUMENT_INVALID;
 310
 311                 ttb = mmu->ttbr[ttbidx] & mmu->ttbr_mask[ttbidx];
 312
 313                 if (ttbidx == 0) {
 314                         int ttbcr_n = mmu->ttbcr & 0x7;
 315                         max_pt_idx = 0x0fff >> ttbcr_n;
 316                 }
 317         }
 318
 319         LOG_USER("Page Directory at (phys): %8.8" TARGET_PRIxADDR, ttb);
 320
 321         first_lvl_ptbl = malloc(sizeof(uint32_t)*(max_pt_idx+1));
 322         if (first_lvl_ptbl == NULL)
 323                 return ERROR_FAIL;
 324
 325         /*
 326          * this may or may not be necessary depending on whether
 327          * the table walker is configured to use the cache or not.
 328          */
 329         cache->flush_all_data_cache(target);
 330
 331         retval = mmu->read_physical_memory(target, ttb, 4, max_pt_idx+1, (uint8_t *)first_lvl_ptbl);
 332         if (retval != ERROR_OK) {
 333                 LOG_ERROR("Failed to read first-level page table!");
 334                 return retval;
 335         }
 336
 337         afe = !!(cortex_a->cp15_control_reg & SCTLR_BIT_AFE);
 338
 339         for (pt_idx = 0; pt_idx <= max_pt_idx;) {
 340                 uint32_t first_lvl_descriptor = target_buffer_get_u32(target,
 341                                                 (uint8_t *)&first_lvl_ptbl[pt_idx]);
 342
 343                 LOG_DEBUG("L1 desc[%8.8"PRIx32"]: %8.8"PRIx32, pt_idx << 20, first_lvl_descriptor);
 344
 345                 /* skip empty entries in the first level table */
 346                 if ((first_lvl_descriptor & 3) == 0) {
 347                         pt_idx++;
 348                 } else
 349                 if ((first_lvl_descriptor & 0x40002) == 2) {
 350                         /* section descriptor */
 351                         uint32_t va_range = 1024*1024-1; /* 1MB range */
 352                         uint32_t va_start = pt_idx << 20;
 353                         uint32_t va_end = va_start + va_range;
 354
 355                         uint32_t pa_start = (first_lvl_descriptor & 0xfff00000);
 356                         uint32_t pa_end = pa_start + va_range;
 357
 358                         LOG_USER("SECT: VA[%8.8"PRIx32" -- %8.8"PRIx32"]: PA[%8.8"PRIx32" -- %8.8"PRIx32"] %s",
 359                                 va_start, va_end, pa_start, pa_end, l1_desc_bits_to_string(first_lvl_descriptor, afe));
 360                         pt_idx++;
 361                 } else
 362                 if ((first_lvl_descriptor & 0x40002) == 0x40002) {
 363                         /* supersection descriptor */
 364                         uint32_t va_range = 16*1024*1024-1; /* 16MB range */
 365                         uint32_t va_start = pt_idx << 20;
 366                         uint32_t va_end = va_start + va_range;
 367
 368                         uint32_t pa_start = (first_lvl_descriptor & 0xff000000);
 369                         uint32_t pa_end = pa_start + va_range;
 370
 371                         LOG_USER("SSCT: VA[%8.8"PRIx32" -- %8.8"PRIx32"]: PA[%8.8"PRIx32" -- %8.8"PRIx32"] %s",
 372                                 va_start, va_end, pa_start, pa_end, l1_desc_bits_to_string(first_lvl_descriptor, afe));
 373
 374                         /* skip next 15 entries, they're duplicating the first entry */
 375                         pt_idx += 16;
 376                 } else {
 377                         target_addr_t second_lvl_ptbl = first_lvl_descriptor & 0xfffffc00;
 378                         uint32_t second_lvl_descriptor;
 379                         uint32_t *pt2;
 380                         int pt2_idx;
 381
 382                         /* page table, always 1KB long */
 383                         pt2 = malloc(1024);
 384                         retval = mmu->read_physical_memory(target, second_lvl_ptbl,
 385                                                   4, 256, (uint8_t *)pt2);
 386                         if (retval != ERROR_OK) {
 387                                 LOG_ERROR("Failed to read second-level page table!");
 388                                 return ERROR_FAIL;
 389                         }
 390
 391                         for (pt2_idx = 0; pt2_idx < 256; ) {
 392                                 second_lvl_descriptor = target_buffer_get_u32(target,
 393                                                 (uint8_t *)&pt2[pt2_idx]);
 394
 395                                 if ((second_lvl_descriptor & 3) == 0) {
 396                                         /* skip entry */
 397                                         pt2_idx++;
 398                                 } else
 399                                 if ((second_lvl_descriptor & 3) == 1) {
 400                                         /* large page */
 401                                         uint32_t va_range = 64*1024-1; /* 64KB range */
 402                                         uint32_t va_start = (pt_idx << 20) + (pt2_idx << 12);
 403                                         uint32_t va_end = va_start + va_range;
 404
 405                                         uint32_t pa_start = (second_lvl_descriptor & 0xffff0000);
 406                                         uint32_t pa_end = pa_start + va_range;
 407
 408                                         LOG_USER("LPGE: VA[%8.8"PRIx32" -- %8.8"PRIx32"]: PA[%8.8"PRIx32" -- %8.8"PRIx32"] %s",
 409                                                 va_start, va_end, pa_start, pa_end, l2_desc_bits_to_string(second_lvl_descriptor, afe));
 410
 411                                         pt2_idx += 16;
 412                                 } else {
 413                                         /* small page */
 414                                         uint32_t va_range = 4*1024-1; /* 4KB range */
 415                                         uint32_t va_start = (pt_idx << 20) + (pt2_idx << 12);
 416                                         uint32_t va_end = va_start + va_range;
 417
 418                                         uint32_t pa_start = (second_lvl_descriptor & 0xfffff000);
 419                                         uint32_t pa_end = pa_start + va_range;
 420
 421                                         LOG_USER("SPGE: VA[%8.8"PRIx32" -- %8.8"PRIx32"]: PA[%8.8"PRIx32" -- %8.8"PRIx32"] %s",
 422                                                 va_start, va_end, pa_start, pa_end, l2_desc_bits_to_string(second_lvl_descriptor, afe));
 423
 424                                         pt2_idx++;
 425                                 }
 426                         }
 427                         free(pt2);
 428                         pt_idx++;
 429                 }
 430         }
 431
 432         free(first_lvl_ptbl);
 433         return ERROR_OK;
 434 }
 435
 436 static const struct command_registration armv7a_mmu_group_handlers[] = {
 437         {
 438                 .name = "dump",
 439                 .handler = armv7a_mmu_dump_table,
 440                 .mode = COMMAND_ANY,
 441                 .help = "dump translation table 0, 1 or from <address>",
 442                 .usage = "(0|1|addr <address> [num_entries])",
 443         },
 444         COMMAND_REGISTRATION_DONE
 445 };
 446
 447 const struct command_registration armv7a_mmu_command_handlers[] = {
 448         {
 449                 .name = "mmu",
 450                 .mode = COMMAND_ANY,
 451                 .help = "mmu command group",
 452                 .usage = "",
 453                 .chain = armv7a_mmu_group_handlers,
 454         },
 455         COMMAND_REGISTRATION_DONE
 456 };