src/target/x86_32_common.h

   1 /*
   2  * Copyright(c) 2013 Intel Corporation.
   3  *
   4  * Adrian Burns (adrian.burns@intel.com)
   5  * Thomas Faust (thomas.faust@intel.com)
   6  * Ivan De Cesaris (ivan.de.cesaris@intel.com)
   7  * Julien Carreno (julien.carreno@intel.com)
   8  * Jeffrey Maxwell (jeffrey.r.maxwell@intel.com)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  22  *
  23  * Contact Information:
  24  * Intel Corporation
  25  */
  26
  27 /*
  28  * @file
  29  * This is the interface to the x86 32 bit memory and breakpoint operations.
  30  */
  31
  32 #ifndef X86_32_COMMON_H
  33 #define X86_32_COMMON_H
  34
  35 #include <jtag/jtag.h>
  36 #include <helper/command.h>
  37 #include <helper/types.h>
  38
  39 extern const struct command_registration x86_32_command_handlers[];
  40
  41 /* for memory access */
  42 #define BYTE                    1
  43 #define WORD                    2
  44 #define DWORD                   4
  45
  46 #define EFLAGS_TF               ((uint32_t)0x00000100) /* Trap Flag */
  47 #define EFLAGS_IF               ((uint32_t)0x00000200) /* Interrupt Flag */
  48 #define EFLAGS_RF               ((uint32_t)0x00010000) /* Resume Flag */
  49 #define EFLAGS_VM86             ((uint32_t)0x00020000) /* Virtual 8086 Mode */
  50
  51 #define CSAR_DPL                ((uint32_t)0x00006000)
  52 #define CSAR_D                  ((uint32_t)0x00400000)
  53 #define SSAR_DPL                ((uint32_t)0x00006000)
  54
  55 #define CR0_PE                  ((uint32_t)0x00000001) /* Protected Mode Enable */
  56 #define CR0_NW                  ((uint32_t)0x20000000) /* Non Write-Through */
  57 #define CR0_CD                  ((uint32_t)0x40000000) /* Cache Disable */
  58 #define CR0_PG                  ((uint32_t)0x80000000) /* Paging Enable */
  59
  60 /* TODO - move back to PM specific file */
  61 #define PM_DR6                  ((uint32_t)0xFFFF0FF0)
  62
  63 #define DR6_BRKDETECT_0         ((uint32_t)0x00000001) /* B0 through B3 */
  64 #define DR6_BRKDETECT_1         ((uint32_t)0x00000002) /* breakpoint condition detected */
  65 #define DR6_BRKDETECT_2         ((uint32_t)0x00000004)
  66 #define DR6_BRKDETECT_3         ((uint32_t)0x00000008)
  67
  68 enum {
  69         /* general purpose registers */
  70         EAX = 0,
  71         ECX,
  72         EDX,
  73         EBX,
  74         ESP,
  75         EBP,
  76         ESI,
  77         EDI,
  78         /* instruction pointer & flags */
  79         EIP,
  80         EFLAGS,
  81
  82         /* segment registers */
  83         CS,
  84         SS,
  85         DS,
  86         ES,
  87         FS,
  88         GS,
  89
  90         /* floating point unit registers */
  91         ST0,
  92         ST1,
  93         ST2,
  94         ST3,
  95         ST4,
  96         ST5,
  97         ST6,
  98         ST7,
  99         FCTRL,
 100         FSTAT,
 101         FTAG,
 102         FISEG,
 103         FIOFF,
 104         FOSEG,
 105         FOOFF,
 106         FOP,
 107
 108         /* control registers */
 109         CR0,
 110         CR2,
 111         CR3,
 112         CR4,
 113
 114         /* debug registers */
 115         DR0,
 116         DR1,
 117         DR2,
 118         DR3,
 119         DR6,
 120         DR7,
 121
 122         /* descriptor tables */
 123         IDTB,
 124         IDTL,
 125         IDTAR,
 126         GDTB,
 127         GDTL,
 128         GDTAR,
 129         TR,
 130         LDTR,
 131         LDTB,
 132         LDTL,
 133         LDTAR,
 134
 135         /* segment registers */
 136         CSB,
 137         CSL,
 138         CSAR,
 139         DSB,
 140         DSL,
 141         DSAR,
 142         ESB,
 143         ESL,
 144         ESAR,
 145         FSB,
 146         FSL,
 147         FSAR,
 148         GSB,
 149         GSL,
 150         GSAR,
 151         SSB,
 152         SSL,
 153         SSAR,
 154         TSSB,
 155         TSSL,
 156         TSSAR,
 157
 158         /* PM control reg */
 159         PMCR,
 160 };
 161
 162 #define X86_32_COMMON_MAGIC 0x86328632
 163
 164 enum {
 165         /* memory read/write */
 166         MEMRDB32 = 0,
 167         MEMRDB16,
 168         MEMRDH32,
 169         MEMRDH16,
 170         MEMRDW32,
 171         MEMRDW16,
 172         MEMWRB32,
 173         MEMWRB16,
 174         MEMWRH32,
 175         MEMWRH16,
 176         MEMWRW32,
 177         MEMWRW16,
 178         /* IO read/write */
 179         IORDB32,
 180         IORDB16,
 181         IORDH32,
 182         IORDH16,
 183         IORDW32,
 184         IORDW16,
 185         IOWRB32,
 186         IOWRB16,
 187         IOWRH32,
 188         IOWRH16,
 189         IOWRW32,
 190         IOWRW16,
 191         /* lakemont1 core shadow ram access opcodes */
 192         SRAMACCESS,
 193         SRAM2PDR,
 194         PDR2SRAM,
 195         WBINVD,
 196 };
 197
 198 struct swbp_mem_patch {
 199         uint8_t orig_byte;
 200         uint32_t swbp_unique_id;
 201         uint32_t physaddr;
 202         struct swbp_mem_patch *next;
 203 };
 204
 205 /* TODO - probemode specific - consider removing */
 206 #define NUM_PM_REGS             18 /* regs used in save/restore */
 207
 208 struct x86_32_common {
 209         uint32_t common_magic;
 210         void *arch_info;
 211         struct reg_cache *cache;
 212         struct jtag_tap *curr_tap;
 213         uint32_t stored_pc;
 214         int flush;
 215
 216         /* pm_regs are for probemode save/restore state */
 217         uint32_t pm_regs[NUM_PM_REGS];
 218
 219         /* working area for fastdata access */
 220         struct working_area *fast_data_area;
 221
 222         int num_hw_bpoints;
 223         struct x86_32_dbg_reg *hw_break_list;
 224         struct swbp_mem_patch *swbbp_mem_patch_list;
 225
 226         /* core probemode implementation dependent functions */
 227         uint8_t (*get_num_user_regs)(struct target *t);
 228         bool (*is_paging_enabled)(struct target *t);
 229         int (*disable_paging)(struct target *t);
 230         int (*enable_paging)(struct target *t);
 231         bool (*sw_bpts_supported)(struct target *t);
 232         int (*transaction_status)(struct target *t);
 233         int (*submit_instruction)(struct target *t, int num);
 234         int (*read_hw_reg)(struct target *t, int reg, uint32_t *regval, uint8_t cache);
 235         int (*write_hw_reg)(struct target *t, int reg,
 236                                 uint32_t regval, uint8_t cache);
 237
 238         /* register cache to processor synchronization */
 239         int (*read_hw_reg_to_cache)(struct target *target, int num);
 240         int (*write_hw_reg_from_cache)(struct target *target, int num);
 241 };
 242
 243 static inline struct x86_32_common *
 244 target_to_x86_32(struct target *target)
 245 {
 246         return target->arch_info;
 247 }
 248 bool check_not_halted(const struct target *t);
 249
 250 /* breakpoint defines */
 251 #define MAX_DEBUG_REGS          4
 252 #define SW_BP_OPCODE            0xf1
 253 #define MAX_SW_BPTS             20
 254
 255 struct x86_32_dbg_reg {
 256         int used;
 257         uint32_t bp_value;
 258 };
 259
 260 #define DR7_G_ENABLE_SHIFT              1
 261 #define DR7_ENABLE_SIZE                 2 /* 2 bits per debug reg */
 262 #define DR7_RW_SHIFT                    16
 263 #define DR7_LENGTH_SHIFT                18
 264 #define DR7_RW_LEN_SIZE                 4
 265 #define DR7_BP_EXECUTE                  0 /* 00 - only on instruction execution*/
 266 #define DR7_BP_WRITE                    1 /* 01 - only on data writes */
 267 /*#define DR7_RW_IORW                   2 UNSUPPORTED 10 - an I/O read and I/O write */
 268 #define DR7_BP_READWRITE                3 /* on data read or data write */
 269 #define DR7_BP_LENGTH_1                 0 /* 00 - 1 byte length */
 270 #define DR7_BP_LENGTH_2                 1 /* 01 - 2 byte length */
 271 #define DR7_BP_LENGTH_4                 3 /* 11 - 4 byte length */
 272
 273 #define DR7_GLOBAL_ENABLE(val, regnum) \
 274         (val |= (1 << (DR7_G_ENABLE_SHIFT + (DR7_ENABLE_SIZE * (regnum)))))
 275
 276 #define DR7_GLOBAL_DISABLE(val, regnum) \
 277         (val &= ~(3 << (DR7_ENABLE_SIZE * (regnum))))
 278
 279 #define DR7_BP_FREE(val, regnum) \
 280         ((val & (3 << (DR7_ENABLE_SIZE * (regnum)))) == 0)
 281
 282 #define DR7_RESET_RWLEN_BITS(val, regnum) \
 283         (val &= ~(0x0f << (DR7_RW_SHIFT + DR7_RW_LEN_SIZE * (regnum))))
 284
 285 #define DR7_SET_EXE(val, regnum) \
 286         (val &= ~(0x0f << (DR7_RW_SHIFT + DR7_RW_LEN_SIZE * (regnum))))
 287
 288 #define DR7_SET_WRITE(val, regnum) \
 289         (val |= (DR7_BP_WRITE << (DR7_RW_SHIFT + DR7_RW_LEN_SIZE * (regnum))))
 290
 291 #define DR7_SET_ACCESS(val, regnum) \
 292         (val |= (DR7_BP_READWRITE << (DR7_RW_SHIFT + DR7_RW_LEN_SIZE * (regnum))))
 293
 294 #define DR7_SET_LENGTH(val, regnum, len) \
 295         (val |= (len == 1) ? (DR7_BP_LENGTH_1 << (DR7_LENGTH_SHIFT + DR7_RW_LEN_SIZE * (regnum))) : \
 296         (len == 2) ? (DR7_BP_LENGTH_2 << (DR7_LENGTH_SHIFT + DR7_RW_LEN_SIZE * (regnum))) : \
 297         (DR7_BP_LENGTH_4 << (DR7_LENGTH_SHIFT + DR7_RW_LEN_SIZE * (regnum))))
 298
 299 /* public interface */
 300 int x86_32_get_gdb_reg_list(struct target *t,
 301                         struct reg **reg_list[], int *reg_list_size,
 302                         enum target_register_class reg_class);
 303 int x86_32_common_init_arch_info(struct target *target,
 304                         struct x86_32_common *x86_32);
 305 int x86_32_common_mmu(struct target *t, int *enabled);
 306 int x86_32_common_virt2phys(struct target *t, uint32_t address, uint32_t *physical);
 307 int x86_32_common_read_phys_mem(struct target *t, uint32_t phys_address,
 308                         uint32_t size, uint32_t count, uint8_t *buffer);
 309 int x86_32_common_write_phys_mem(struct target *t, uint32_t phys_address,
 310                         uint32_t size, uint32_t count, const uint8_t *buffer);
 311 int x86_32_common_read_memory(struct target *t, uint32_t addr,
 312                         uint32_t size, uint32_t count, uint8_t *buf);
 313 int x86_32_common_write_memory(struct target *t, uint32_t addr,
 314                         uint32_t size, uint32_t count, const uint8_t *buf);
 315 int x86_32_common_read_io(struct target *t, uint32_t addr,
 316                         uint32_t size, uint8_t *buf);
 317 int x86_32_common_write_io(struct target *t, uint32_t addr,
 318                         uint32_t size, const uint8_t *buf);
 319 int x86_32_common_add_breakpoint(struct target *t, struct breakpoint *bp);
 320 int x86_32_common_remove_breakpoint(struct target *t, struct breakpoint *bp);
 321 int x86_32_common_add_watchpoint(struct target *t, struct watchpoint *wp);
 322 int x86_32_common_remove_watchpoint(struct target *t, struct watchpoint *wp);
 323
 324 #endif /* X86_32_COMMON_H */