1 /* Native-dependent code for GNU/Linux m32r. 2 3 Copyright (C) 2004-2014 Free Software Foundation, Inc. 4 5 This file is part of GDB. 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 3 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 #include "defs.h" 21 #include "inferior.h" 22 #include "gdbcore.h" 23 #include "regcache.h" 24 #include "linux-nat.h" 25 #include "target.h" 26 27 #include "gdb_assert.h" 28 #include <string.h> 29 #include <sys/ptrace.h> 30 #include <sys/user.h> 31 #include <sys/procfs.h> 32 33 /* Prototypes for supply_gregset etc. */ 34 #include "gregset.h" 35 36 #include "m32r-tdep.h" 37 38 39 40 41 /* Since EVB register is not available for native debug, we reduce 42 the number of registers. */ 43 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) 44 45 /* Mapping between the general-purpose registers in `struct user' 46 format and GDB's register array layout. */ 47 static int regmap[] = { 48 4, 5, 6, 7, 0, 1, 2, 8, 49 9, 10, 11, 12, 13, 24, 25, 23, 50 19, 19, 26, 23, 22, 20, 16, 15 51 }; 52 53 #define PSW_REGMAP 19 54 #define BBPSW_REGMAP 21 55 #define SPU_REGMAP 23 56 #define SPI_REGMAP 26 57 58 /* Doee (??) apply to the corresponding SET requests as well. */ 59 #define GETREGS_SUPPLIES(regno) (0 <= (regno) \ 60 && (regno) <= M32R_LINUX_NUM_REGS) 61 62 63 64 /* Transfering the general-purpose registers between GDB, inferiors 65 and core files. */ 66 67 /* Fill GDB's register array with the general-purpose register values 68 in *GREGSETP. */ 69 70 void 71 supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp) 72 { 73 const elf_greg_t *regp = (const elf_greg_t *) gregsetp; 74 int i; 75 unsigned long psw, bbpsw; 76 77 psw = *(regp + PSW_REGMAP); 78 bbpsw = *(regp + BBPSW_REGMAP); 79 80 for (i = 0; i < M32R_LINUX_NUM_REGS; i++) 81 { 82 elf_greg_t regval; 83 84 switch (i) 85 { 86 case PSW_REGNUM: 87 regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); 88 break; 89 case CBR_REGNUM: 90 regval = ((psw >> 8) & 1); 91 break; 92 default: 93 regval = *(regp + regmap[i]); 94 break; 95 } 96 97 if (i != M32R_SP_REGNUM) 98 regcache_raw_supply (regcache, i, ®val); 99 else if (psw & 0x8000) 100 regcache_raw_supply (regcache, i, regp + SPU_REGMAP); 101 else 102 regcache_raw_supply (regcache, i, regp + SPI_REGMAP); 103 } 104 } 105 106 /* Fetch all general-purpose registers from process/thread TID and 107 store their values in GDB's register array. */ 108 109 static void 110 fetch_regs (struct regcache *regcache, int tid) 111 { 112 elf_gregset_t regs; 113 114 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 115 perror_with_name (_("Couldn't get registers")); 116 117 supply_gregset (regcache, (const elf_gregset_t *) ®s); 118 } 119 120 /* Fill register REGNO (if it is a general-purpose register) in 121 *GREGSETPS with the value in GDB's register array. If REGNO is -1, 122 do this for all registers. */ 123 124 void 125 fill_gregset (const struct regcache *regcache, 126 elf_gregset_t * gregsetp, int regno) 127 { 128 elf_greg_t *regp = (elf_greg_t *) gregsetp; 129 int i; 130 unsigned long psw, bbpsw, tmp; 131 132 psw = *(regp + PSW_REGMAP); 133 bbpsw = *(regp + BBPSW_REGMAP); 134 135 for (i = 0; i < M32R_LINUX_NUM_REGS; i++) 136 { 137 if (regno != -1 && regno != i) 138 continue; 139 140 if (i == CBR_REGNUM || i == PSW_REGNUM) 141 continue; 142 143 if (i == SPU_REGNUM || i == SPI_REGNUM) 144 continue; 145 146 if (i != M32R_SP_REGNUM) 147 regcache_raw_collect (regcache, i, regp + regmap[i]); 148 else if (psw & 0x8000) 149 regcache_raw_collect (regcache, i, regp + SPU_REGMAP); 150 else 151 regcache_raw_collect (regcache, i, regp + SPI_REGMAP); 152 } 153 } 154 155 /* Store all valid general-purpose registers in GDB's register array 156 into the process/thread specified by TID. */ 157 158 static void 159 store_regs (const struct regcache *regcache, int tid, int regno) 160 { 161 elf_gregset_t regs; 162 163 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 164 perror_with_name (_("Couldn't get registers")); 165 166 fill_gregset (regcache, ®s, regno); 167 168 if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) 169 perror_with_name (_("Couldn't write registers")); 170 } 171 172 173 174 /* Transfering floating-point registers between GDB, inferiors and cores. 175 Since M32R has no floating-point registers, these functions do nothing. */ 176 177 void 178 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) 179 { 180 } 181 182 void 183 fill_fpregset (const struct regcache *regcache, 184 gdb_fpregset_t *fpregs, int regno) 185 { 186 } 187 188 189 190 /* Transferring arbitrary registers between GDB and inferior. */ 191 192 /* Fetch register REGNO from the child process. If REGNO is -1, do 193 this for all registers (including the floating point and SSE 194 registers). */ 195 196 static void 197 m32r_linux_fetch_inferior_registers (struct target_ops *ops, 198 struct regcache *regcache, int regno) 199 { 200 int tid; 201 202 /* GNU/Linux LWP ID's are process ID's. */ 203 tid = ptid_get_lwp (inferior_ptid); 204 if (tid == 0) 205 tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ 206 207 /* Use the PTRACE_GETREGS request whenever possible, since it 208 transfers more registers in one system call, and we'll cache the 209 results. */ 210 if (regno == -1 || GETREGS_SUPPLIES (regno)) 211 { 212 fetch_regs (regcache, tid); 213 return; 214 } 215 216 internal_error (__FILE__, __LINE__, 217 _("Got request for bad register number %d."), regno); 218 } 219 220 /* Store register REGNO back into the child process. If REGNO is -1, 221 do this for all registers (including the floating point and SSE 222 registers). */ 223 static void 224 m32r_linux_store_inferior_registers (struct target_ops *ops, 225 struct regcache *regcache, int regno) 226 { 227 int tid; 228 229 /* GNU/Linux LWP ID's are process ID's. */ 230 if ((tid = ptid_get_lwp (inferior_ptid)) == 0) 231 tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ 232 233 /* Use the PTRACE_SETREGS request whenever possible, since it 234 transfers more registers in one system call. */ 235 if (regno == -1 || GETREGS_SUPPLIES (regno)) 236 { 237 store_regs (regcache, tid, regno); 238 return; 239 } 240 241 internal_error (__FILE__, __LINE__, 242 _("Got request to store bad register number %d."), regno); 243 } 244 245 void _initialize_m32r_linux_nat (void); 246 247 void 248 _initialize_m32r_linux_nat (void) 249 { 250 struct target_ops *t; 251 252 /* Fill in the generic GNU/Linux methods. */ 253 t = linux_target (); 254 255 /* Add our register access methods. */ 256 t->to_fetch_registers = m32r_linux_fetch_inferior_registers; 257 t->to_store_registers = m32r_linux_store_inferior_registers; 258 259 /* Register the target. */ 260 linux_nat_add_target (t); 261 } 262