| 1 | /* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB. |
| 2 | Copyright 2007, 2008, 2009, 2010 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 | |
| 26 | #include <sys/ptrace.h> |
| 27 | #include <xtensa-config.h> |
| 28 | |
| 29 | #include "xtensa-xtregs.c" |
| 30 | |
| 31 | enum regnum { |
| 32 | R_PC=0, R_PS, |
| 33 | R_LBEG, R_LEND, R_LCOUNT, |
| 34 | R_SAR, |
| 35 | R_WS, R_WB, |
| 36 | R_A0 = 64 |
| 37 | }; |
| 38 | |
| 39 | static void |
| 40 | xtensa_fill_gregset (struct regcache *regcache, void *buf) |
| 41 | { |
| 42 | elf_greg_t* rset = (elf_greg_t*)buf; |
| 43 | int ar0_regnum; |
| 44 | char *ptr; |
| 45 | int i; |
| 46 | |
| 47 | /* Take care of AR registers. */ |
| 48 | |
| 49 | ar0_regnum = find_regno ("ar0"); |
| 50 | ptr = (char*)&rset[R_A0]; |
| 51 | |
| 52 | for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) |
| 53 | { |
| 54 | collect_register (regcache, i, ptr); |
| 55 | ptr += register_size(i); |
| 56 | } |
| 57 | |
| 58 | /* Loop registers, if hardware has it. */ |
| 59 | |
| 60 | #if XCHAL_HAVE_LOOP |
| 61 | collect_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]); |
| 62 | collect_register_by_name (regcache, "lend", (char*)&rset[R_LEND]); |
| 63 | collect_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]); |
| 64 | #endif |
| 65 | |
| 66 | collect_register_by_name (regcache, "sar", (char*)&rset[R_SAR]); |
| 67 | collect_register_by_name (regcache, "pc", (char*)&rset[R_PC]); |
| 68 | collect_register_by_name (regcache, "ps", (char*)&rset[R_PS]); |
| 69 | collect_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]); |
| 70 | collect_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]); |
| 71 | } |
| 72 | |
| 73 | static void |
| 74 | xtensa_store_gregset (struct regcache *regcache, const void *buf) |
| 75 | { |
| 76 | const elf_greg_t* rset = (const elf_greg_t*)buf; |
| 77 | int ar0_regnum; |
| 78 | char *ptr; |
| 79 | int i; |
| 80 | |
| 81 | /* Take care of AR registers. */ |
| 82 | |
| 83 | ar0_regnum = find_regno ("ar0"); |
| 84 | ptr = (char *)&rset[R_A0]; |
| 85 | |
| 86 | for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++) |
| 87 | { |
| 88 | supply_register (regcache, i, ptr); |
| 89 | ptr += register_size(i); |
| 90 | } |
| 91 | |
| 92 | /* Loop registers, if hardware has it. */ |
| 93 | |
| 94 | #if XCHAL_HAVE_LOOP |
| 95 | supply_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]); |
| 96 | supply_register_by_name (regcache, "lend", (char*)&rset[R_LEND]); |
| 97 | supply_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]); |
| 98 | #endif |
| 99 | |
| 100 | supply_register_by_name (regcache, "sar", (char*)&rset[R_SAR]); |
| 101 | supply_register_by_name (regcache, "pc", (char*)&rset[R_PC]); |
| 102 | supply_register_by_name (regcache, "ps", (char*)&rset[R_PS]); |
| 103 | supply_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]); |
| 104 | supply_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]); |
| 105 | } |
| 106 | |
| 107 | /* Xtensa GNU/Linux PTRACE interface includes extended register set. */ |
| 108 | |
| 109 | static void |
| 110 | xtensa_fill_xtregset (struct regcache *regcache, void *buf) |
| 111 | { |
| 112 | const xtensa_regtable_t *ptr; |
| 113 | |
| 114 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| 115 | { |
| 116 | collect_register_by_name (regcache, ptr->name, |
| 117 | (char*)buf + ptr->ptrace_offset); |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | static void |
| 122 | xtensa_store_xtregset (struct regcache *regcache, const void *buf) |
| 123 | { |
| 124 | const xtensa_regtable_t *ptr; |
| 125 | |
| 126 | for (ptr = xtensa_regmap_table; ptr->name; ptr++) |
| 127 | { |
| 128 | supply_register_by_name (regcache, ptr->name, |
| 129 | (char*)buf + ptr->ptrace_offset); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | struct regset_info target_regsets[] = { |
| 134 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
| 135 | GENERAL_REGS, |
| 136 | xtensa_fill_gregset, xtensa_store_gregset }, |
| 137 | { PTRACE_GETXTREGS, PTRACE_SETXTREGS, 0, XTENSA_ELF_XTREG_SIZE, |
| 138 | EXTENDED_REGS, |
| 139 | xtensa_fill_xtregset, xtensa_store_xtregset }, |
| 140 | { 0, 0, 0, -1, -1, NULL, NULL } |
| 141 | }; |
| 142 | |
| 143 | #if XCHAL_HAVE_BE |
| 144 | #define XTENSA_BREAKPOINT {0xd2,0x0f} |
| 145 | #else |
| 146 | #define XTENSA_BREAKPOINT {0x2d,0xf0} |
| 147 | #endif |
| 148 | |
| 149 | static const unsigned char xtensa_breakpoint[] = XTENSA_BREAKPOINT; |
| 150 | #define xtensa_breakpoint_len 2 |
| 151 | |
| 152 | static CORE_ADDR |
| 153 | xtensa_get_pc (struct regcache *regcache) |
| 154 | { |
| 155 | unsigned long pc; |
| 156 | |
| 157 | collect_register_by_name (regcache, "pc", &pc); |
| 158 | return pc; |
| 159 | } |
| 160 | |
| 161 | static void |
| 162 | xtensa_set_pc (struct regcache *regcache, CORE_ADDR pc) |
| 163 | { |
| 164 | unsigned long newpc = pc; |
| 165 | supply_register_by_name (regcache, "pc", &newpc); |
| 166 | } |
| 167 | |
| 168 | static int |
| 169 | xtensa_breakpoint_at (CORE_ADDR where) |
| 170 | { |
| 171 | unsigned long insn; |
| 172 | |
| 173 | (*the_target->read_memory) (where, (unsigned char *) &insn, |
| 174 | xtensa_breakpoint_len); |
| 175 | return memcmp((char *)&insn, xtensa_breakpoint, xtensa_breakpoint_len) == 0; |
| 176 | } |
| 177 | |
| 178 | struct linux_target_ops the_low_target = { |
| 179 | init_registers_xtensa, |
| 180 | 0, |
| 181 | 0, |
| 182 | 0, |
| 183 | 0, |
| 184 | xtensa_get_pc, |
| 185 | xtensa_set_pc, |
| 186 | xtensa_breakpoint, |
| 187 | xtensa_breakpoint_len, |
| 188 | NULL, |
| 189 | 0, |
| 190 | xtensa_breakpoint_at, |
| 191 | }; |