1 /* Native support for the SGI Iris running IRIX version 5, for GDB. 2 3 Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 4 1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc. 5 6 Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU 7 and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin. 8 Implemented for Irix 4.x by Garrett A. Wollman. 9 Modified for Irix 5.x by Ian Lance Taylor. 10 11 This file is part of GDB. 12 13 This program is free software; you can redistribute it and/or modify 14 it under the terms of the GNU General Public License as published by 15 the Free Software Foundation; either version 2 of the License, or 16 (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, 19 but WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 GNU General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place - Suite 330, 26 Boston, MA 02111-1307, USA. */ 27 28 #include "defs.h" 29 #include "inferior.h" 30 #include "gdbcore.h" 31 #include "target.h" 32 #include "regcache.h" 33 34 #include "gdb_string.h" 35 #include <sys/time.h> 36 #include <sys/procfs.h> 37 #include <setjmp.h> /* For JB_XXX. */ 38 39 /* Prototypes for supply_gregset etc. */ 40 #include "gregset.h" 41 #include "mips-tdep.h" 42 43 static void fetch_core_registers (char *, unsigned int, int, CORE_ADDR); 44 45 /* Size of elements in jmpbuf */ 46 47 #define JB_ELEMENT_SIZE 4 48 49 /* 50 * See the comment in m68k-tdep.c regarding the utility of these functions. 51 * 52 * These definitions are from the MIPS SVR4 ABI, so they may work for 53 * any MIPS SVR4 target. 54 */ 55 56 void 57 supply_gregset (gregset_t *gregsetp) 58 { 59 int regi; 60 greg_t *regp = &(*gregsetp)[0]; 61 int gregoff = sizeof (greg_t) - mips_isa_regsize (current_gdbarch); 62 static char zerobuf[32] = {0}; 63 64 for (regi = 0; regi <= CTX_RA; regi++) 65 regcache_raw_supply (current_regcache, regi, 66 (char *) (regp + regi) + gregoff); 67 68 regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->pc, 69 (char *) (regp + CTX_EPC) + gregoff); 70 regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->hi, 71 (char *) (regp + CTX_MDHI) + gregoff); 72 regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->lo, 73 (char *) (regp + CTX_MDLO) + gregoff); 74 regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->cause, 75 (char *) (regp + CTX_CAUSE) + gregoff); 76 77 /* Fill inaccessible registers with zero. */ 78 regcache_raw_supply (current_regcache, mips_regnum (current_gdbarch)->badvaddr, zerobuf); 79 } 80 81 void 82 fill_gregset (gregset_t *gregsetp, int regno) 83 { 84 int regi; 85 greg_t *regp = &(*gregsetp)[0]; 86 87 /* Under Irix6, if GDB is built with N32 ABI and is debugging an O32 88 executable, we have to sign extend the registers to 64 bits before 89 filling in the gregset structure. */ 90 91 for (regi = 0; regi <= CTX_RA; regi++) 92 if ((regno == -1) || (regno == regi)) 93 *(regp + regi) = 94 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)], 95 register_size (current_gdbarch, regi)); 96 97 if ((regno == -1) || (regno == PC_REGNUM)) 98 *(regp + CTX_EPC) = 99 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->pc)], 100 register_size (current_gdbarch, mips_regnum (current_gdbarch)->pc)); 101 102 if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->cause)) 103 *(regp + CTX_CAUSE) = 104 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->cause)], 105 register_size (current_gdbarch, mips_regnum (current_gdbarch)->cause)); 106 107 if ((regno == -1) 108 || (regno == mips_regnum (current_gdbarch)->hi)) 109 *(regp + CTX_MDHI) = 110 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->hi)], 111 register_size (current_gdbarch, mips_regnum (current_gdbarch)->hi)); 112 113 if ((regno == -1) || (regno == mips_regnum (current_gdbarch)->lo)) 114 *(regp + CTX_MDLO) = 115 extract_signed_integer (&deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->lo)], 116 register_size (current_gdbarch, mips_regnum (current_gdbarch)->lo)); 117 } 118 119 /* 120 * Now we do the same thing for floating-point registers. 121 * We don't bother to condition on FP0_REGNUM since any 122 * reasonable MIPS configuration has an R3010 in it. 123 * 124 * Again, see the comments in m68k-tdep.c. 125 */ 126 127 void 128 supply_fpregset (fpregset_t *fpregsetp) 129 { 130 int regi; 131 static char zerobuf[32] = {0}; 132 133 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ 134 135 for (regi = 0; regi < 32; regi++) 136 regcache_raw_supply (current_regcache, FP0_REGNUM + regi, 137 (char *) &fpregsetp->fp_r.fp_regs[regi]); 138 139 regcache_raw_supply (current_regcache, 140 mips_regnum (current_gdbarch)->fp_control_status, 141 (char *) &fpregsetp->fp_csr); 142 143 /* FIXME: how can we supply FCRIR? SGI doesn't tell us. */ 144 regcache_raw_supply (current_regcache, 145 mips_regnum (current_gdbarch)->fp_implementation_revision, 146 zerobuf); 147 } 148 149 void 150 fill_fpregset (fpregset_t *fpregsetp, int regno) 151 { 152 int regi; 153 char *from, *to; 154 155 /* FIXME, this is wrong for the N32 ABI which has 64 bit FP regs. */ 156 157 for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++) 158 { 159 if ((regno == -1) || (regno == regi)) 160 { 161 from = (char *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (regi)]; 162 to = (char *) &(fpregsetp->fp_r.fp_regs[regi - FP0_REGNUM]); 163 memcpy (to, from, register_size (current_gdbarch, regi)); 164 } 165 } 166 167 if ((regno == -1) 168 || (regno == mips_regnum (current_gdbarch)->fp_control_status)) 169 fpregsetp->fp_csr = *(unsigned *) &deprecated_registers[DEPRECATED_REGISTER_BYTE (mips_regnum (current_gdbarch)->fp_control_status)]; 170 } 171 172 173 /* Figure out where the longjmp will land. 174 We expect the first arg to be a pointer to the jmp_buf structure from which 175 we extract the pc (JB_PC) that we will land at. The pc is copied into PC. 176 This routine returns true on success. */ 177 178 int 179 get_longjmp_target (CORE_ADDR *pc) 180 { 181 char *buf; 182 CORE_ADDR jb_addr; 183 184 buf = alloca (TARGET_PTR_BIT / TARGET_CHAR_BIT); 185 jb_addr = read_register (A0_REGNUM); 186 187 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf, 188 TARGET_PTR_BIT / TARGET_CHAR_BIT)) 189 return 0; 190 191 *pc = extract_unsigned_integer (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT); 192 193 return 1; 194 } 195 196 /* Provide registers to GDB from a core file. 197 198 CORE_REG_SECT points to an array of bytes, which were obtained from 199 a core file which BFD thinks might contain register contents. 200 CORE_REG_SIZE is its size. 201 202 Normally, WHICH says which register set corelow suspects this is: 203 0 --- the general-purpose register set 204 2 --- the floating-point register set 205 However, for Irix 5, WHICH isn't used. 206 207 REG_ADDR is also unused. */ 208 209 static void 210 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, 211 int which, CORE_ADDR reg_addr) 212 { 213 if (core_reg_size == deprecated_register_bytes ()) 214 { 215 memcpy ((char *) deprecated_registers, core_reg_sect, core_reg_size); 216 } 217 else if (mips_isa_regsize (current_gdbarch) == 4 && 218 core_reg_size == (2 * mips_isa_regsize (current_gdbarch)) * NUM_REGS) 219 { 220 /* This is a core file from a N32 executable, 64 bits are saved 221 for all registers. */ 222 char *srcp = core_reg_sect; 223 char *dstp = deprecated_registers; 224 int regno; 225 226 for (regno = 0; regno < NUM_REGS; regno++) 227 { 228 if (regno >= FP0_REGNUM && regno < (FP0_REGNUM + 32)) 229 { 230 /* FIXME, this is wrong, N32 has 64 bit FP regs, but GDB 231 currently assumes that they are 32 bit. */ 232 *dstp++ = *srcp++; 233 *dstp++ = *srcp++; 234 *dstp++ = *srcp++; 235 *dstp++ = *srcp++; 236 if (register_size (current_gdbarch, regno) == 4) 237 { 238 /* copying 4 bytes from eight bytes? 239 I don't see how this can be right... */ 240 srcp += 4; 241 } 242 else 243 { 244 /* copy all 8 bytes (sizeof(double)) */ 245 *dstp++ = *srcp++; 246 *dstp++ = *srcp++; 247 *dstp++ = *srcp++; 248 *dstp++ = *srcp++; 249 } 250 } 251 else 252 { 253 srcp += 4; 254 *dstp++ = *srcp++; 255 *dstp++ = *srcp++; 256 *dstp++ = *srcp++; 257 *dstp++ = *srcp++; 258 } 259 } 260 } 261 else 262 { 263 warning ("wrong size gregset struct in core file"); 264 return; 265 } 266 267 deprecated_registers_fetched (); 268 } 269 270 /* Register that we are able to handle irix5 core file formats. 271 This really is bfd_target_unknown_flavour */ 272 273 static struct core_fns irix5_core_fns = 274 { 275 bfd_target_unknown_flavour, /* core_flavour */ 276 default_check_format, /* check_format */ 277 default_core_sniffer, /* core_sniffer */ 278 fetch_core_registers, /* core_read_registers */ 279 NULL /* next */ 280 }; 281 282 void 283 _initialize_core_irix5 (void) 284 { 285 deprecated_add_core_fns (&irix5_core_fns); 286 } 287