1 /* Native-dependent code for GNU/Linux m32r. 2 3 Copyright (C) 2004-2016 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 #include "nat/gdb_ptrace.h" 27 #include <sys/user.h> 28 #include <sys/procfs.h> 29 30 /* Prototypes for supply_gregset etc. */ 31 #include "gregset.h" 32 33 #include "m32r-tdep.h" 34 35 36 37 38 /* Since EVB register is not available for native debug, we reduce 39 the number of registers. */ 40 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) 41 42 /* Mapping between the general-purpose registers in `struct user' 43 format and GDB's register array layout. */ 44 static int regmap[] = { 45 4, 5, 6, 7, 0, 1, 2, 8, 46 9, 10, 11, 12, 13, 24, 25, 23, 47 19, 19, 26, 23, 22, 20, 16, 15 48 }; 49 50 #define PSW_REGMAP 19 51 #define BBPSW_REGMAP 21 52 #define SPU_REGMAP 23 53 #define SPI_REGMAP 26 54 55 /* Doee (??) apply to the corresponding SET requests as well. */ 56 #define GETREGS_SUPPLIES(regno) (0 <= (regno) \ 57 && (regno) <= M32R_LINUX_NUM_REGS) 58 59 60 61 /* Transfering the general-purpose registers between GDB, inferiors 62 and core files. */ 63 64 /* Fill GDB's register array with the general-purpose register values 65 in *GREGSETP. */ 66 67 void 68 supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp) 69 { 70 const elf_greg_t *regp = (const elf_greg_t *) gregsetp; 71 int i; 72 unsigned long psw, bbpsw; 73 74 psw = *(regp + PSW_REGMAP); 75 bbpsw = *(regp + BBPSW_REGMAP); 76 77 for (i = 0; i < M32R_LINUX_NUM_REGS; i++) 78 { 79 elf_greg_t regval; 80 81 switch (i) 82 { 83 case PSW_REGNUM: 84 regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); 85 break; 86 case CBR_REGNUM: 87 regval = ((psw >> 8) & 1); 88 break; 89 default: 90 regval = *(regp + regmap[i]); 91 break; 92 } 93 94 if (i != M32R_SP_REGNUM) 95 regcache_raw_supply (regcache, i, ®val); 96 else if (psw & 0x8000) 97 regcache_raw_supply (regcache, i, regp + SPU_REGMAP); 98 else 99 regcache_raw_supply (regcache, i, regp + SPI_REGMAP); 100 } 101 } 102 103 /* Fetch all general-purpose registers from process/thread TID and 104 store their values in GDB's register array. */ 105 106 static void 107 fetch_regs (struct regcache *regcache, int tid) 108 { 109 elf_gregset_t regs; 110 111 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 112 perror_with_name (_("Couldn't get registers")); 113 114 supply_gregset (regcache, (const elf_gregset_t *) ®s); 115 } 116 117 /* Fill register REGNO (if it is a general-purpose register) in 118 *GREGSETPS with the value in GDB's register array. If REGNO is -1, 119 do this for all registers. */ 120 121 void 122 fill_gregset (const struct regcache *regcache, 123 elf_gregset_t * gregsetp, int regno) 124 { 125 elf_greg_t *regp = (elf_greg_t *) gregsetp; 126 int i; 127 unsigned long psw, bbpsw, tmp; 128 129 psw = *(regp + PSW_REGMAP); 130 bbpsw = *(regp + BBPSW_REGMAP); 131 132 for (i = 0; i < M32R_LINUX_NUM_REGS; i++) 133 { 134 if (regno != -1 && regno != i) 135 continue; 136 137 if (i == CBR_REGNUM || i == PSW_REGNUM) 138 continue; 139 140 if (i == SPU_REGNUM || i == SPI_REGNUM) 141 continue; 142 143 if (i != M32R_SP_REGNUM) 144 regcache_raw_collect (regcache, i, regp + regmap[i]); 145 else if (psw & 0x8000) 146 regcache_raw_collect (regcache, i, regp + SPU_REGMAP); 147 else 148 regcache_raw_collect (regcache, i, regp + SPI_REGMAP); 149 } 150 } 151 152 /* Store all valid general-purpose registers in GDB's register array 153 into the process/thread specified by TID. */ 154 155 static void 156 store_regs (const struct regcache *regcache, int tid, int regno) 157 { 158 elf_gregset_t regs; 159 160 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 161 perror_with_name (_("Couldn't get registers")); 162 163 fill_gregset (regcache, ®s, regno); 164 165 if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) 166 perror_with_name (_("Couldn't write registers")); 167 } 168 169 170 171 /* Transfering floating-point registers between GDB, inferiors and cores. 172 Since M32R has no floating-point registers, these functions do nothing. */ 173 174 void 175 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) 176 { 177 } 178 179 void 180 fill_fpregset (const struct regcache *regcache, 181 gdb_fpregset_t *fpregs, int regno) 182 { 183 } 184 185 186 187 /* Transferring arbitrary registers between GDB and inferior. */ 188 189 /* Fetch register REGNO from the child process. If REGNO is -1, do 190 this for all registers (including the floating point and SSE 191 registers). */ 192 193 static void 194 m32r_linux_fetch_inferior_registers (struct target_ops *ops, 195 struct regcache *regcache, int regno) 196 { 197 int tid; 198 199 /* GNU/Linux LWP ID's are process ID's. */ 200 tid = ptid_get_lwp (inferior_ptid); 201 if (tid == 0) 202 tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ 203 204 /* Use the PTRACE_GETREGS request whenever possible, since it 205 transfers more registers in one system call, and we'll cache the 206 results. */ 207 if (regno == -1 || GETREGS_SUPPLIES (regno)) 208 { 209 fetch_regs (regcache, tid); 210 return; 211 } 212 213 internal_error (__FILE__, __LINE__, 214 _("Got request for bad register number %d."), regno); 215 } 216 217 /* Store register REGNO back into the child process. If REGNO is -1, 218 do this for all registers (including the floating point and SSE 219 registers). */ 220 static void 221 m32r_linux_store_inferior_registers (struct target_ops *ops, 222 struct regcache *regcache, int regno) 223 { 224 int tid; 225 226 /* GNU/Linux LWP ID's are process ID's. */ 227 if ((tid = ptid_get_lwp (inferior_ptid)) == 0) 228 tid = ptid_get_pid (inferior_ptid); /* Not a threaded program. */ 229 230 /* Use the PTRACE_SETREGS request whenever possible, since it 231 transfers more registers in one system call. */ 232 if (regno == -1 || GETREGS_SUPPLIES (regno)) 233 { 234 store_regs (regcache, tid, regno); 235 return; 236 } 237 238 internal_error (__FILE__, __LINE__, 239 _("Got request to store bad register number %d."), regno); 240 } 241 242 void _initialize_m32r_linux_nat (void); 243 244 void 245 _initialize_m32r_linux_nat (void) 246 { 247 struct target_ops *t; 248 249 /* Fill in the generic GNU/Linux methods. */ 250 t = linux_target (); 251 252 /* Add our register access methods. */ 253 t->to_fetch_registers = m32r_linux_fetch_inferior_registers; 254 t->to_store_registers = m32r_linux_store_inferior_registers; 255 256 /* Register the target. */ 257 linux_nat_add_target (t); 258 } 259