1 /* Native-dependent code for GNU/Linux m32r. 2 3 Copyright (C) 2004-2017 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 #include "inf-ptrace.h" 30 31 /* Prototypes for supply_gregset etc. */ 32 #include "gregset.h" 33 34 #include "m32r-tdep.h" 35 36 37 38 39 /* Since EVB register is not available for native debug, we reduce 40 the number of registers. */ 41 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) 42 43 /* Mapping between the general-purpose registers in `struct user' 44 format and GDB's register array layout. */ 45 static int regmap[] = { 46 4, 5, 6, 7, 0, 1, 2, 8, 47 9, 10, 11, 12, 13, 24, 25, 23, 48 19, 19, 26, 23, 22, 20, 16, 15 49 }; 50 51 #define PSW_REGMAP 19 52 #define BBPSW_REGMAP 21 53 #define SPU_REGMAP 23 54 #define SPI_REGMAP 26 55 56 /* Doee (??) apply to the corresponding SET requests as well. */ 57 #define GETREGS_SUPPLIES(regno) (0 <= (regno) \ 58 && (regno) <= M32R_LINUX_NUM_REGS) 59 60 61 62 /* Transfering the general-purpose registers between GDB, inferiors 63 and core files. */ 64 65 /* Fill GDB's register array with the general-purpose register values 66 in *GREGSETP. */ 67 68 void 69 supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp) 70 { 71 const elf_greg_t *regp = (const elf_greg_t *) gregsetp; 72 int i; 73 unsigned long psw, bbpsw; 74 75 psw = *(regp + PSW_REGMAP); 76 bbpsw = *(regp + BBPSW_REGMAP); 77 78 for (i = 0; i < M32R_LINUX_NUM_REGS; i++) 79 { 80 elf_greg_t regval; 81 82 switch (i) 83 { 84 case PSW_REGNUM: 85 regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); 86 break; 87 case CBR_REGNUM: 88 regval = ((psw >> 8) & 1); 89 break; 90 default: 91 regval = *(regp + regmap[i]); 92 break; 93 } 94 95 if (i != M32R_SP_REGNUM) 96 regcache_raw_supply (regcache, i, ®val); 97 else if (psw & 0x8000) 98 regcache_raw_supply (regcache, i, regp + SPU_REGMAP); 99 else 100 regcache_raw_supply (regcache, i, regp + SPI_REGMAP); 101 } 102 } 103 104 /* Fetch all general-purpose registers from process/thread TID and 105 store their values in GDB's register array. */ 106 107 static void 108 fetch_regs (struct regcache *regcache, int tid) 109 { 110 elf_gregset_t regs; 111 112 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 113 perror_with_name (_("Couldn't get registers")); 114 115 supply_gregset (regcache, (const elf_gregset_t *) ®s); 116 } 117 118 /* Fill register REGNO (if it is a general-purpose register) in 119 *GREGSETPS with the value in GDB's register array. If REGNO is -1, 120 do this for all registers. */ 121 122 void 123 fill_gregset (const struct regcache *regcache, 124 elf_gregset_t * gregsetp, int regno) 125 { 126 elf_greg_t *regp = (elf_greg_t *) gregsetp; 127 int i; 128 unsigned long psw, bbpsw, tmp; 129 130 psw = *(regp + PSW_REGMAP); 131 bbpsw = *(regp + BBPSW_REGMAP); 132 133 for (i = 0; i < M32R_LINUX_NUM_REGS; i++) 134 { 135 if (regno != -1 && regno != i) 136 continue; 137 138 if (i == CBR_REGNUM || i == PSW_REGNUM) 139 continue; 140 141 if (i == SPU_REGNUM || i == SPI_REGNUM) 142 continue; 143 144 if (i != M32R_SP_REGNUM) 145 regcache_raw_collect (regcache, i, regp + regmap[i]); 146 else if (psw & 0x8000) 147 regcache_raw_collect (regcache, i, regp + SPU_REGMAP); 148 else 149 regcache_raw_collect (regcache, i, regp + SPI_REGMAP); 150 } 151 } 152 153 /* Store all valid general-purpose registers in GDB's register array 154 into the process/thread specified by TID. */ 155 156 static void 157 store_regs (const struct regcache *regcache, int tid, int regno) 158 { 159 elf_gregset_t regs; 160 161 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 162 perror_with_name (_("Couldn't get registers")); 163 164 fill_gregset (regcache, ®s, regno); 165 166 if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) 167 perror_with_name (_("Couldn't write registers")); 168 } 169 170 171 172 /* Transfering floating-point registers between GDB, inferiors and cores. 173 Since M32R has no floating-point registers, these functions do nothing. */ 174 175 void 176 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs) 177 { 178 } 179 180 void 181 fill_fpregset (const struct regcache *regcache, 182 gdb_fpregset_t *fpregs, int regno) 183 { 184 } 185 186 187 188 /* Transferring arbitrary registers between GDB and inferior. */ 189 190 /* Fetch register REGNO from the child process. If REGNO is -1, do 191 this for all registers (including the floating point and SSE 192 registers). */ 193 194 static void 195 m32r_linux_fetch_inferior_registers (struct target_ops *ops, 196 struct regcache *regcache, int regno) 197 { 198 pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); 199 200 /* Use the PTRACE_GETREGS request whenever possible, since it 201 transfers more registers in one system call, and we'll cache the 202 results. */ 203 if (regno == -1 || GETREGS_SUPPLIES (regno)) 204 { 205 fetch_regs (regcache, tid); 206 return; 207 } 208 209 internal_error (__FILE__, __LINE__, 210 _("Got request for bad register number %d."), regno); 211 } 212 213 /* Store register REGNO back into the child process. If REGNO is -1, 214 do this for all registers (including the floating point and SSE 215 registers). */ 216 static void 217 m32r_linux_store_inferior_registers (struct target_ops *ops, 218 struct regcache *regcache, int regno) 219 { 220 pid_t tid = get_ptrace_pid (regcache_get_ptid (regcache)); 221 222 /* Use the PTRACE_SETREGS request whenever possible, since it 223 transfers more registers in one system call. */ 224 if (regno == -1 || GETREGS_SUPPLIES (regno)) 225 { 226 store_regs (regcache, tid, regno); 227 return; 228 } 229 230 internal_error (__FILE__, __LINE__, 231 _("Got request to store bad register number %d."), regno); 232 } 233 234 void _initialize_m32r_linux_nat (void); 235 236 void 237 _initialize_m32r_linux_nat (void) 238 { 239 struct target_ops *t; 240 241 /* Fill in the generic GNU/Linux methods. */ 242 t = linux_target (); 243 244 /* Add our register access methods. */ 245 t->to_fetch_registers = m32r_linux_fetch_inferior_registers; 246 t->to_store_registers = m32r_linux_store_inferior_registers; 247 248 /* Register the target. */ 249 linux_nat_add_target (t); 250 } 251