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   1 /***************************************************************************
   2  *   Copyright (C) 2018 by Square, Inc.                                    *
   3  *   Steven Stallion <stallion@squareup.com>                               *
   4  *   James Zhao <hjz@squareup.com>                                         *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  18  ***************************************************************************/
  19
  20 #ifndef OPENOCD_TARGET_ESIRISC_H
  21 #define OPENOCD_TARGET_ESIRISC_H
  22
  23 #include <target/breakpoints.h>
  24 #include <target/register.h>
  25 #include <target/target.h>
  26
  27 #include "esirisc_jtag.h"
  28 #include "esirisc_regs.h"
  29
  30 #define MAX_BREAKPOINTS                 8
  31 #define MAX_WATCHPOINTS                 8
  32
  33 /* Exception IDs */
  34 #define EID_RESET                               0x00
  35 #define EID_HARDWARE_FAILURE    0x01
  36 #define EID_NMI                                 0x02
  37 #define EID_INST_BREAKPOINT             0x03
  38 #define EID_DATA_BREAKPOINT             0x04
  39 #define EID_UNSUPPORTED                 0x05
  40 #define EID_PRIVILEGE_VIOLATION 0x06
  41 #define EID_INST_BUS_ERROR              0x07
  42 #define EID_DATA_BUS_ERROR              0x08
  43 #define EID_ALIGNMENT_ERROR             0x09
  44 #define EID_ARITHMETIC_ERROR    0x0a
  45 #define EID_SYSTEM_CALL                 0x0b
  46 #define EID_MEMORY_MANAGEMENT   0x0c
  47 #define EID_UNRECOVERABLE               0x0d
  48 #define EID_INTERRUPTn                  0x20
  49
  50 /* Exception Entry Points */
  51 #define ENTRY_RESET                             0x00
  52 #define ENTRY_UNRECOVERABLE             0x01
  53 #define ENTRY_HARDWARE_FAILURE  0x02
  54 #define ENTRY_RUNTIME                   0x03
  55 #define ENTRY_MEMORY                    0x04
  56 #define ENTRY_SYSCALL                   0x05
  57 #define ENTRY_DEBUG                             0x06
  58 #define ENTRY_NMI                               0x07
  59 #define ENTRY_INTERRUPTn                0x08
  60
  61 /* Hardware Debug Control */
  62 #define HWDC_R                                  (1<<4)  /* Reset & Hardware Failure */
  63 #define HWDC_I                                  (1<<3)  /* Interrupts */
  64 #define HWDC_S                                  (1<<2)  /* System Calls */
  65 #define HWDC_E                                  (1<<1)  /* Program Errors */
  66 #define HWDC_D                                  (1<<0)  /* Debug Exceptions */
  67
  68 enum esirisc_cache {
  69         ESIRISC_CACHE_VON_NEUMANN,
  70         ESIRISC_CACHE_HARVARD,
  71 };
  72
  73 struct esirisc_common {
  74         struct target *target;
  75         struct esirisc_jtag jtag_info;
  76         enum esirisc_cache cache_arch;
  77         char *gdb_arch;
  78
  79         struct reg_cache *reg_cache;
  80         struct reg *epc;
  81         struct reg *ecas;
  82         struct reg *eid;
  83         struct reg *ed;
  84         uint32_t etc_save;
  85         uint32_t hwdc_save;
  86
  87         int num_bits;
  88         int num_regs;
  89         bool has_icache;
  90         bool has_dcache;
  91         int num_breakpoints;
  92         int num_watchpoints;
  93
  94         struct breakpoint *breakpoints_p[MAX_BREAKPOINTS];
  95         struct watchpoint *watchpoints_p[MAX_WATCHPOINTS];
  96 };
  97
  98 union esirisc_memory {
  99         uint32_t word;
 100         uint16_t hword;
 101         uint8_t byte;
 102 };
 103
 104 struct esirisc_reg {
 105         struct esirisc_common *esirisc;
 106
 107         uint8_t bank;
 108         uint8_t csr;
 109
 110         int (*read)(struct reg *reg);
 111         int (*write)(struct reg *reg);
 112 };
 113
 114 static inline struct esirisc_common *target_to_esirisc(struct target *target)
 115 {
 116         return (struct esirisc_common *)target->arch_info;
 117 }
 118
 119 static inline char *esirisc_cache_arch(struct esirisc_common *esirisc)
 120 {
 121         return esirisc->cache_arch == ESIRISC_CACHE_HARVARD ? "harvard" : "von_neumann";
 122 }
 123
 124 static inline bool esirisc_has_cache(struct esirisc_common *esirisc)
 125 {
 126         return esirisc->has_icache || esirisc->has_dcache;
 127 }
 128
 129 #endif /* OPENOCD_TARGET_ESIRISC_H */