| 1 | /* Intel 386 native support. |
| 2 | Copyright (C) 1988, 1989, 1991, 1992 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "language.h" |
| 24 | #include "gdbcore.h" |
| 25 | |
| 26 | #ifdef USG |
| 27 | #include <sys/types.h> |
| 28 | #endif |
| 29 | |
| 30 | #include <sys/param.h> |
| 31 | #include <sys/dir.h> |
| 32 | #include <signal.h> |
| 33 | #include <sys/user.h> |
| 34 | #include <sys/ioctl.h> |
| 35 | #include <fcntl.h> |
| 36 | |
| 37 | #include <sys/file.h> |
| 38 | #include <sys/stat.h> |
| 39 | |
| 40 | #include <stddef.h> |
| 41 | #include <sys/ptrace.h> |
| 42 | |
| 43 | /* Does AIX define this in <errno.h>? */ |
| 44 | extern int errno; |
| 45 | |
| 46 | #ifndef NO_SYS_REG_H |
| 47 | #include <sys/reg.h> |
| 48 | #endif |
| 49 | |
| 50 | #include "floatformat.h" |
| 51 | |
| 52 | #include "target.h" |
| 53 | |
| 54 | \f |
| 55 | /* this table must line up with REGISTER_NAMES in tm-i386v.h */ |
| 56 | /* symbols like 'EAX' come from <sys/reg.h> */ |
| 57 | static int regmap[] = |
| 58 | { |
| 59 | EAX, ECX, EDX, EBX, |
| 60 | USP, EBP, ESI, EDI, |
| 61 | EIP, EFL, CS, SS, |
| 62 | DS, ES, FS, GS, |
| 63 | }; |
| 64 | |
| 65 | /* blockend is the value of u.u_ar0, and points to the |
| 66 | * place where GS is stored |
| 67 | */ |
| 68 | |
| 69 | int |
| 70 | i386_register_u_addr (blockend, regnum) |
| 71 | int blockend; |
| 72 | int regnum; |
| 73 | { |
| 74 | #if 0 |
| 75 | /* this will be needed if fp registers are reinstated */ |
| 76 | /* for now, you can look at them with 'info float' |
| 77 | * sys5 wont let you change them with ptrace anyway |
| 78 | */ |
| 79 | if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) |
| 80 | { |
| 81 | int ubase, fpstate; |
| 82 | struct user u; |
| 83 | ubase = blockend + 4 * (SS + 1) - KSTKSZ; |
| 84 | fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u); |
| 85 | return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM)); |
| 86 | } |
| 87 | else |
| 88 | #endif |
| 89 | return (blockend + 4 * regmap[regnum]); |
| 90 | |
| 91 | } |
| 92 | |
| 93 | /* The code below only work on the aix ps/2 (i386-ibm-aix) - |
| 94 | * mtranle@paris - Sat Apr 11 10:34:12 1992 |
| 95 | */ |
| 96 | |
| 97 | struct env387 |
| 98 | { |
| 99 | unsigned short control; |
| 100 | unsigned short r0; |
| 101 | unsigned short status; |
| 102 | unsigned short r1; |
| 103 | unsigned short tag; |
| 104 | unsigned short r2; |
| 105 | unsigned long eip; |
| 106 | unsigned short code_seg; |
| 107 | unsigned short opcode; |
| 108 | unsigned long operand; |
| 109 | unsigned short operand_seg; |
| 110 | unsigned short r3; |
| 111 | unsigned char regs[8][10]; |
| 112 | }; |
| 113 | |
| 114 | static |
| 115 | print_387_status (status, ep) |
| 116 | unsigned short status; |
| 117 | struct env387 *ep; |
| 118 | { |
| 119 | int i; |
| 120 | int bothstatus; |
| 121 | int top; |
| 122 | int fpreg; |
| 123 | unsigned char *p; |
| 124 | |
| 125 | bothstatus = ((status != 0) && (ep->status != 0)); |
| 126 | if (status != 0) |
| 127 | { |
| 128 | if (bothstatus) |
| 129 | printf_unfiltered ("u: "); |
| 130 | print_387_status_word (status); |
| 131 | } |
| 132 | |
| 133 | if (ep->status != 0) |
| 134 | { |
| 135 | if (bothstatus) |
| 136 | printf_unfiltered ("e: "); |
| 137 | print_387_status_word (ep->status); |
| 138 | } |
| 139 | |
| 140 | print_387_control_word (ep->control); |
| 141 | printf_unfiltered ("last exception: "); |
| 142 | printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode)); |
| 143 | printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg)); |
| 144 | printf_unfiltered ("%s; ", local_hex_string(ep->eip)); |
| 145 | printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg)); |
| 146 | printf_unfiltered (":%s\n", local_hex_string(ep->operand)); |
| 147 | |
| 148 | top = ((ep->status >> 11) & 7); |
| 149 | |
| 150 | printf_unfiltered ("regno tag msb lsb value\n"); |
| 151 | for (fpreg = 7; fpreg >= 0; fpreg--) |
| 152 | { |
| 153 | double val; |
| 154 | |
| 155 | printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg); |
| 156 | |
| 157 | switch ((ep->tag >> ((7 - fpreg) * 2)) & 3) |
| 158 | { |
| 159 | case 0: printf_unfiltered ("valid "); break; |
| 160 | case 1: printf_unfiltered ("zero "); break; |
| 161 | case 2: printf_unfiltered ("trap "); break; |
| 162 | case 3: printf_unfiltered ("empty "); break; |
| 163 | } |
| 164 | for (i = 9; i >= 0; i--) |
| 165 | printf_unfiltered ("%02x", ep->regs[fpreg][i]); |
| 166 | |
| 167 | i387_to_double ((char *)ep->regs[fpreg], (char *)&val); |
| 168 | printf_unfiltered (" %#g\n", val); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | static struct env387 core_env387; |
| 173 | |
| 174 | void |
| 175 | i386_float_info () |
| 176 | { |
| 177 | struct env387 fps; |
| 178 | int fpsaved = 0; |
| 179 | /* We need to reverse the order of the registers. Apparently AIX stores |
| 180 | the highest-numbered ones first. */ |
| 181 | struct env387 fps_fixed; |
| 182 | int i; |
| 183 | |
| 184 | if (inferior_pid) |
| 185 | { |
| 186 | char buf[10]; |
| 187 | unsigned short status; |
| 188 | |
| 189 | ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status)); |
| 190 | memcpy (&status, buf, sizeof (status)); |
| 191 | fpsaved = status; |
| 192 | } |
| 193 | else |
| 194 | { |
| 195 | if ((fpsaved = core_env387.status) != 0) |
| 196 | memcpy(&fps, &core_env387, sizeof(fps)); |
| 197 | } |
| 198 | |
| 199 | if (fpsaved == 0) |
| 200 | { |
| 201 | printf_unfiltered ("no floating point status saved\n"); |
| 202 | return; |
| 203 | } |
| 204 | |
| 205 | if (inferior_pid) |
| 206 | { |
| 207 | int offset; |
| 208 | for (offset = 0; offset < sizeof(fps); offset += 10) |
| 209 | { |
| 210 | char buf[10]; |
| 211 | ptrace (PT_READ_FPR, inferior_pid, buf, offset); |
| 212 | memcpy ((char *)&fps.control + offset, buf, |
| 213 | MIN(10, sizeof(fps) - offset)); |
| 214 | } |
| 215 | } |
| 216 | fps_fixed = fps; |
| 217 | for (i = 0; i < 8; ++i) |
| 218 | memcpy (fps_fixed.regs[i], fps.regs[7 - i], 10); |
| 219 | print_387_status (0, &fps_fixed); |
| 220 | } |
| 221 | |
| 222 | /* Fetch one register. */ |
| 223 | static void |
| 224 | fetch_register (regno) |
| 225 | int regno; |
| 226 | { |
| 227 | char buf[MAX_REGISTER_RAW_SIZE]; |
| 228 | if (regno < FP0_REGNUM) |
| 229 | *(int *)buf = ptrace (PT_READ_GPR, inferior_pid, |
| 230 | PT_REG(regmap[regno]), 0, 0); |
| 231 | else |
| 232 | ptrace (PT_READ_FPR, inferior_pid, buf, |
| 233 | (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs)); |
| 234 | supply_register (regno, buf); |
| 235 | } |
| 236 | |
| 237 | void |
| 238 | fetch_inferior_registers (regno) |
| 239 | int regno; |
| 240 | { |
| 241 | if (regno < 0) |
| 242 | for (regno = 0; regno < NUM_REGS; regno++) |
| 243 | fetch_register (regno); |
| 244 | else |
| 245 | fetch_register (regno); |
| 246 | } |
| 247 | |
| 248 | /* store one register */ |
| 249 | static void |
| 250 | store_register (regno) |
| 251 | int regno; |
| 252 | { |
| 253 | char buf[80]; |
| 254 | extern char registers[]; |
| 255 | errno = 0; |
| 256 | if (regno < FP0_REGNUM) |
| 257 | ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]), |
| 258 | *(int *) ®isters[REGISTER_BYTE (regno)], 0); |
| 259 | else |
| 260 | ptrace (PT_WRITE_FPR, inferior_pid, ®isters[REGISTER_BYTE (regno)], |
| 261 | (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs)); |
| 262 | |
| 263 | if (errno != 0) |
| 264 | { |
| 265 | sprintf (buf, "writing register number %d", regno); |
| 266 | perror_with_name (buf); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | /* Store our register values back into the inferior. |
| 271 | If REGNO is -1, do this for all registers. |
| 272 | Otherwise, REGNO specifies which register (so we can save time). */ |
| 273 | void |
| 274 | store_inferior_registers (regno) |
| 275 | int regno; |
| 276 | { |
| 277 | if (regno < 0) |
| 278 | for (regno = 0; regno < NUM_REGS; regno++) |
| 279 | store_register (regno); |
| 280 | else |
| 281 | store_register (regno); |
| 282 | } |
| 283 | |
| 284 | #ifndef CD_AX /* defined in sys/i386/coredump.h */ |
| 285 | # define CD_AX 0 |
| 286 | # define CD_BX 1 |
| 287 | # define CD_CX 2 |
| 288 | # define CD_DX 3 |
| 289 | # define CD_SI 4 |
| 290 | # define CD_DI 5 |
| 291 | # define CD_BP 6 |
| 292 | # define CD_SP 7 |
| 293 | # define CD_FL 8 |
| 294 | # define CD_IP 9 |
| 295 | # define CD_CS 10 |
| 296 | # define CD_DS 11 |
| 297 | # define CD_ES 12 |
| 298 | # define CD_FS 13 |
| 299 | # define CD_GS 14 |
| 300 | # define CD_SS 15 |
| 301 | #endif |
| 302 | |
| 303 | /* |
| 304 | * The order here in core_regmap[] has to be the same as in |
| 305 | * regmap[] above. |
| 306 | */ |
| 307 | static int core_regmap[] = |
| 308 | { |
| 309 | CD_AX, CD_CX, CD_DX, CD_BX, |
| 310 | CD_SP, CD_BP, CD_SI, CD_DI, |
| 311 | CD_IP, CD_FL, CD_CS, CD_SS, |
| 312 | CD_DS, CD_ES, CD_FS, CD_GS, |
| 313 | }; |
| 314 | |
| 315 | void |
| 316 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) |
| 317 | char *core_reg_sect; |
| 318 | unsigned core_reg_size; |
| 319 | int which; |
| 320 | unsigned int reg_addr; /* ignored */ |
| 321 | { |
| 322 | |
| 323 | if (which == 0) |
| 324 | { |
| 325 | /* Integer registers */ |
| 326 | |
| 327 | #define cd_regs(n) ((int *)core_reg_sect)[n] |
| 328 | #define regs(n) *((int *) ®isters[REGISTER_BYTE (n)]) |
| 329 | |
| 330 | int i; |
| 331 | for (i = 0; i < FP0_REGNUM; i++) |
| 332 | regs(i) = cd_regs(core_regmap[i]); |
| 333 | } |
| 334 | else if (which == 2) |
| 335 | { |
| 336 | /* Floating point registers */ |
| 337 | |
| 338 | if (core_reg_size >= sizeof (core_env387)) |
| 339 | memcpy (&core_env387, core_reg_sect, core_reg_size); |
| 340 | else |
| 341 | fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n"); |
| 342 | } |
| 343 | } |