1 /* Native-dependent code for GNU/Linux m32r. 2 3 Copyright 2004 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 2 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, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #include "defs.h" 23 #include "inferior.h" 24 #include "gdbcore.h" 25 #include "regcache.h" 26 #include "linux-nat.h" 27 28 #include "gdb_assert.h" 29 #include "gdb_string.h" 30 #include <sys/ptrace.h> 31 #include <sys/user.h> 32 #include <sys/procfs.h> 33 34 /* Prototypes for supply_gregset etc. */ 35 #include "gregset.h" 36 37 #include "m32r-tdep.h" 38 39 40 41 42 /* Since EVB register is not available for native debug, we reduce 43 the number of registers. */ 44 #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1) 45 46 /* Mapping between the general-purpose registers in `struct user' 47 format and GDB's register array layout. */ 48 static int regmap[] = { 49 4, 5, 6, 7, 0, 1, 2, 8, 50 9, 10, 11, 12, 13, 24, 25, 23, 51 19, 19, 26, 23, 22, 20, 16, 15 52 }; 53 54 #define PSW_REGMAP 19 55 #define BBPSW_REGMAP 21 56 #define SPU_REGMAP 23 57 #define SPI_REGMAP 26 58 59 /* Doee apply to the corresponding SET requests as well. */ 60 #define GETREGS_SUPPLIES(regno) (0 <= (regno) && (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 (elf_gregset_t * gregsetp) 72 { 73 elf_greg_t *regp = (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 switch (i) 83 { 84 case PSW_REGNUM: 85 *(regp + regmap[i]) = 86 ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8); 87 break; 88 case CBR_REGNUM: 89 *(regp + regmap[i]) = ((psw >> 8) & 1); 90 break; 91 } 92 93 if (i != M32R_SP_REGNUM) 94 regcache_raw_supply (current_regcache, i, regp + regmap[i]); 95 else if (psw & 0x8000) 96 regcache_raw_supply (current_regcache, i, regp + SPU_REGMAP); 97 else 98 regcache_raw_supply (current_regcache, i, regp + SPI_REGMAP); 99 } 100 } 101 102 /* Fetch all general-purpose registers from process/thread TID and 103 store their values in GDB's register array. */ 104 105 static void 106 fetch_regs (int tid) 107 { 108 elf_gregset_t regs; 109 110 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 111 perror_with_name ("Couldn't get registers"); 112 113 supply_gregset (®s); 114 } 115 116 /* Fill register REGNO (if it is a general-purpose register) in 117 *GREGSETPS with the value in GDB's register array. If REGNO is -1, 118 do this for all registers. */ 119 120 void 121 fill_gregset (elf_gregset_t * gregsetp, int regno) 122 { 123 elf_greg_t *regp = (elf_greg_t *) gregsetp; 124 int i; 125 unsigned long psw, bbpsw, tmp; 126 127 psw = *(regp + PSW_REGMAP); 128 bbpsw = *(regp + BBPSW_REGMAP); 129 130 for (i = 0; i < M32R_LINUX_NUM_REGS; i++) 131 { 132 if (regno != -1 && regno != i) 133 continue; 134 135 if (i == CBR_REGNUM || i == PSW_REGNUM) 136 continue; 137 138 if (i == SPU_REGNUM || i == SPI_REGNUM) 139 continue; 140 141 if (i != M32R_SP_REGNUM) 142 regcache_raw_collect (current_regcache, i, regp + regmap[i]); 143 else if (psw & 0x8000) 144 regcache_raw_collect (current_regcache, i, regp + SPU_REGMAP); 145 else 146 regcache_raw_collect (current_regcache, i, regp + SPI_REGMAP); 147 } 148 } 149 150 /* Store all valid general-purpose registers in GDB's register array 151 into the process/thread specified by TID. */ 152 153 static void 154 store_regs (int tid, int regno) 155 { 156 elf_gregset_t regs; 157 158 if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0) 159 perror_with_name ("Couldn't get registers"); 160 161 fill_gregset (®s, regno); 162 163 if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0) 164 perror_with_name ("Couldn't write registers"); 165 } 166 167 168 169 /* Transfering floating-point registers between GDB, inferiors and cores. 170 Since M32R has no floating-point registers, these functions do nothing. */ 171 172 void 173 supply_fpregset (gdb_fpregset_t *fpregs) 174 { 175 } 176 177 void 178 fill_fpregset (gdb_fpregset_t *fpregs, int regno) 179 { 180 } 181 182 183 184 /* Transferring arbitrary registers between GDB and inferior. */ 185 186 /* Fetch register REGNO from the child process. If REGNO is -1, do 187 this for all registers (including the floating point and SSE 188 registers). */ 189 190 void 191 fetch_inferior_registers (int regno) 192 { 193 int tid; 194 195 /* GNU/Linux LWP ID's are process ID's. */ 196 tid = TIDGET (inferior_ptid); 197 if (tid == 0) 198 tid = PIDGET (inferior_ptid); /* Not a threaded program. */ 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 (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 void 217 store_inferior_registers (int regno) 218 { 219 int tid; 220 221 /* GNU/Linux LWP ID's are process ID's. */ 222 if ((tid = TIDGET (inferior_ptid)) == 0) 223 tid = PIDGET (inferior_ptid); /* Not a threaded program. */ 224 225 /* Use the PTRACE_SETREGS request whenever possible, since it 226 transfers more registers in one system call. */ 227 if (regno == -1 || GETREGS_SUPPLIES (regno)) 228 { 229 store_regs (tid, regno); 230 return; 231 } 232 233 internal_error (__FILE__, __LINE__, 234 "Got request to store bad register number %d.", regno); 235 } 236