| 1 | /* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB. |
| 2 | Copyright (C) 2007-2015 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 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 3 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 | #include "server.h" |
| 21 | #include "linux-low.h" |
| 22 | |
| 23 | /* Defined in auto-generated file reg-xtensa.c. */ |
| 24 | void init_registers_xtensa (void); |
| 25 | extern const struct target_desc *tdesc_xtensa; |
| 26 | |
| 27 | #include <asm/ptrace.h> |
| 28 | #include <xtensa-config.h> |
| 29 | |
| 30 | #include "xtensa-xtregs.c" |
| 31 | |
| 32 | enum regnum { |
| 33 | R_PC=0, R_PS, |
| 34 | R_LBEG, R_LEND, R_LCOUNT, |
| 35 | R_SAR, |
| 36 | R_WS, R_WB, |
| 37 | R_A0 = 64 |
| 38 | }; |
| 39 | |
| 40 | static void |
| 41 | xtensa_fill_gregset (struct regcache *regcache, void *buf) |
| 42 | { |
| 43 | elf_greg_t* rset = (elf_greg_t*)buf; |
| 44 | const struct target_desc *tdesc = regcache->tdesc; |
| 45 | int ar0_regnum; |
| 46 | char *ptr; |
| 47 | int i; |
| 48 | |
| 49 | /* Take care of AR registers. */ |
| 50 | |
| 51 | ar0_regnum = find_regno (tdesc, "ar0"); |
| 52 | ptr = (char*)&rset[R_A0]; |
| 53 | |
| 54 | for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) |
| 55 | { |
| 56 | collect_register (regcache, i, ptr); |
| 57 | ptr += register_size (tdesc, i); |
| 58 | } |
| 59 | |
| 60 | /* Loop registers, if hardware has it. */ |
| 61 | |
| 62 | #if XCHAL_HAVE_LOOP |
| 63 | collect_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]); |
| 64 | collect_register_by_name (regcache, "lend", (char*)&rset[R_LEND]); |
| 65 | collect_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]); |
| 66 | #endif |
| 67 | |
| 68 | collect_register_by_name (regcache, "sar", (char*)&rset[R_SAR]); |
| 69 | collect_register_by_name (regcache, "pc", (char*)&rset[R_PC]); |
| 70 | collect_register_by_name (regcache, "ps", (char*)&rset[R_PS]); |
| 71 | collect_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]); |
| 72 | collect_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]); |
| 73 | } |
| 74 | |
| 75 | static void |
| 76 | xtensa_store_gregset (struct regcache *regcache, const void *buf) |
| 77 | { |
| 78 | const elf_greg_t* rset = (const elf_greg_t*)buf; |
| 79 | const struct target_desc *tdesc = regcache->tdesc; |
| 80 | int ar0_regnum; |
| 81 | char *ptr; |
| 82 | int i; |
| 83 | |
| 84 | /* Take care of AR registers. */ |
| 85 | |
| 86 | ar0_regnum = find_regno (tdesc, "ar0"); |
| 87 | ptr = (char *)&rset[R_A0]; |
| 88 | |
| 89 | for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) |
| 90 | { |
| 91 | supply_register (regcache, i, ptr); |
| 92 | ptr += register_size (tdesc, i); |
| 93 | } |
| 94 | |
| 95 | /* Loop registers, if hardware has it. */ |
| 96 | |
| 97 | #if XCHAL_HAVE_LOOP |
| 98 | supply_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]); |
| 99 | supply_register_by_name (regcache, "lend", (char*)&rset[R_LEND]); |
| 100 | supply_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]); |
| 101 | #endif |
| 102 | |
| 103 | supply_register_by_name (regcache, "sar", (char*)&rset[R_SAR]); |
| 104 | supply_register_by_name (regcache, "pc", (char*)&rset[R_PC]); |
| 105 | supply_register_by_name (regcache, "ps", (char*)&rset[R_PS]); |
| 106 | supply_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]); |
| 107 | supply_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]); |
| 108 | } |
| 109 | |
| 110 | /* Xtensa GNU/Linux PTRACE interface includes extended register set. */ |
| 111 | |
| 112 | static void |
| 113 | xtensa_fill_xtregset (struct regcache *regcache, void *buf) |
| 114 | { |
| 115 | const xtensa_regtable_t *ptr; |
| 116 | |
| 117 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| 118 | { |
| 119 | collect_register_by_name (regcache, ptr->name, |
| 120 | (char*)buf + ptr->ptrace_offset); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | static void |
| 125 | xtensa_store_xtregset (struct regcache *regcache, const void *buf) |
| 126 | { |
| 127 | const xtensa_regtable_t *ptr; |
| 128 | |
| 129 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| 130 | { |
| 131 | supply_register_by_name (regcache, ptr->name, |
| 132 | (char*)buf + ptr->ptrace_offset); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static struct regset_info xtensa_regsets[] = { |
| 137 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
| 138 | GENERAL_REGS, |
| 139 | xtensa_fill_gregset, xtensa_store_gregset }, |
| 140 | { PTRACE_GETXTREGS, PTRACE_SETXTREGS, 0, XTENSA_ELF_XTREG_SIZE, |
| 141 | EXTENDED_REGS, |
| 142 | xtensa_fill_xtregset, xtensa_store_xtregset }, |
| 143 | { 0, 0, 0, -1, -1, NULL, NULL } |
| 144 | }; |
| 145 | |
| 146 | #if XCHAL_HAVE_BE |
| 147 | #define XTENSA_BREAKPOINT {0xd2,0x0f} |
| 148 | #else |
| 149 | #define XTENSA_BREAKPOINT {0x2d,0xf0} |
| 150 | #endif |
| 151 | |
| 152 | static const unsigned char xtensa_breakpoint[] = XTENSA_BREAKPOINT; |
| 153 | #define xtensa_breakpoint_len 2 |
| 154 | |
| 155 | static CORE_ADDR |
| 156 | xtensa_get_pc (struct regcache *regcache) |
| 157 | { |
| 158 | unsigned long pc; |
| 159 | |
| 160 | collect_register_by_name (regcache, "pc", &pc); |
| 161 | return pc; |
| 162 | } |
| 163 | |
| 164 | static void |
| 165 | xtensa_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| 166 | { |
| 167 | unsigned long newpc = pc; |
| 168 | supply_register_by_name (regcache, "pc", &newpc); |
| 169 | } |
| 170 | |
| 171 | static int |
| 172 | xtensa_breakpoint_at (CORE_ADDR where) |
| 173 | { |
| 174 | unsigned long insn; |
| 175 | |
| 176 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
| 177 | xtensa_breakpoint_len); |
| 178 | return memcmp((char *) &insn, |
| 179 | xtensa_breakpoint, xtensa_breakpoint_len) == 0; |
| 180 | } |
| 181 | |
| 182 | static struct regsets_info xtensa_regsets_info = |
| 183 | { |
| 184 | xtensa_regsets, /* regsets */ |
| 185 | 0, /* num_regsets */ |
| 186 | NULL, /* disabled_regsets */ |
| 187 | }; |
| 188 | |
| 189 | static struct usrregs_info xtensa_usrregs_info = |
| 190 | { |
| 191 | xtensa_num_regs, |
| 192 | xtensa_regmap, |
| 193 | }; |
| 194 | |
| 195 | static struct regs_info regs_info = |
| 196 | { |
| 197 | NULL, /* regset_bitmap */ |
| 198 | &xtensa_usrregs_info, |
| 199 | &xtensa_regsets_info |
| 200 | }; |
| 201 | |
| 202 | static void |
| 203 | xtensa_arch_setup (void) |
| 204 | { |
| 205 | current_process ()->tdesc = tdesc_xtensa; |
| 206 | } |
| 207 | |
| 208 | static const struct regs_info * |
| 209 | xtensa_regs_info (void) |
| 210 | { |
| 211 | return ®s_info; |
| 212 | } |
| 213 | |
| 214 | struct linux_target_ops the_low_target = { |
| 215 | xtensa_arch_setup, |
| 216 | xtensa_regs_info, |
| 217 | 0, |
| 218 | 0, |
| 219 | NULL, /* fetch_register */ |
| 220 | xtensa_get_pc, |
| 221 | xtensa_set_pc, |
| 222 | xtensa_breakpoint, |
| 223 | xtensa_breakpoint_len, |
| 224 | NULL, |
| 225 | 0, |
| 226 | xtensa_breakpoint_at, |
| 227 | }; |
| 228 | |
| 229 | |
| 230 | void |
| 231 | initialize_low_arch (void) |
| 232 | { |
| 233 | /* Initialize the Linux target descriptions. */ |
| 234 | init_registers_xtensa (); |
| 235 | |
| 236 | initialize_regsets_info (&xtensa_regsets_info); |
| 237 | } |