1 /* Intel 386 native support.
2 Copyright (C) 1988, 1989, 1991, 1992 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
27 #include <sys/types.h>
30 #include <sys/param.h>
34 #include <sys/ioctl.h>
41 #include <sys/ptrace.h>
43 /* Does AIX define this in <errno.h>? */
50 #include "floatformat.h"
55 /* this table must line up with REGISTER_NAMES in tm-i386v.h */
56 /* symbols like 'EAX' come from <sys/reg.h> */
65 /* blockend is the value of u.u_ar0, and points to the
66 * place where GS is stored
70 i386_register_u_addr (blockend, regnum)
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
79 if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
83 ubase = blockend + 4 * (SS + 1) - KSTKSZ;
84 fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
85 return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
89 return (blockend + 4 * regmap[regnum]);
93 /* The code below only work on the aix ps/2 (i386-ibm-aix) -
94 * mtranle@paris - Sat Apr 11 10:34:12 1992
99 unsigned short control;
101 unsigned short status;
106 unsigned short code_seg;
107 unsigned short opcode;
108 unsigned long operand;
109 unsigned short operand_seg;
111 unsigned char regs[8][10];
115 print_387_status (status, ep)
116 unsigned short status;
125 bothstatus = ((status != 0) && (ep->status != 0));
129 printf_unfiltered ("u: ");
130 print_387_status_word (status);
136 printf_unfiltered ("e: ");
137 print_387_status_word (ep->status);
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));
148 top = ((ep->status >> 11) & 7);
150 printf_unfiltered ("regno tag msb lsb value\n");
151 for (fpreg = 7; fpreg >= 0; fpreg--)
155 printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
157 switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
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;
164 for (i = 9; i >= 0; i--)
165 printf_unfiltered ("%02x", ep->regs[fpreg][i]);
167 i387_to_double ((char *)ep->regs[fpreg], (char *)&val);
168 printf_unfiltered (" %#g\n", val);
172 static struct env387 core_env387;
179 /* We need to reverse the order of the registers. Apparently AIX stores
180 the highest-numbered ones first. */
181 struct env387 fps_fixed;
187 unsigned short status;
189 ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
190 memcpy (&status, buf, sizeof (status));
195 if ((fpsaved = core_env387.status) != 0)
196 memcpy(&fps, &core_env387, sizeof(fps));
201 printf_unfiltered ("no floating point status saved\n");
208 for (offset = 0; offset < sizeof(fps); offset += 10)
211 ptrace (PT_READ_FPR, inferior_pid, buf, offset);
212 memcpy ((char *)&fps.control + offset, buf,
213 MIN(10, sizeof(fps) - offset));
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);
222 /* Fetch one register. */
224 fetch_register (regno)
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);
232 ptrace (PT_READ_FPR, inferior_pid, buf,
233 (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
234 supply_register (regno, buf);
238 fetch_inferior_registers (regno)
242 for (regno = 0; regno < NUM_REGS; regno++)
243 fetch_register (regno);
245 fetch_register (regno);
248 /* store one register */
250 store_register (regno)
254 extern char registers[];
256 if (regno < FP0_REGNUM)
257 ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
258 *(int *) ®isters[REGISTER_BYTE (regno)], 0);
260 ptrace (PT_WRITE_FPR, inferior_pid, ®isters[REGISTER_BYTE (regno)],
261 (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
265 sprintf (buf, "writing register number %d", regno);
266 perror_with_name (buf);
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). */
274 store_inferior_registers (regno)
278 for (regno = 0; regno < NUM_REGS; regno++)
279 store_register (regno);
281 store_register (regno);
284 #ifndef CD_AX /* defined in sys/i386/coredump.h */
304 * The order here in core_regmap[] has to be the same as in
307 static int core_regmap[] =
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,
316 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
318 unsigned core_reg_size;
320 unsigned int reg_addr; /* ignored */
325 /* Integer registers */
327 #define cd_regs(n) ((int *)core_reg_sect)[n]
328 #define regs(n) *((int *) ®isters[REGISTER_BYTE (n)])
331 for (i = 0; i < FP0_REGNUM; i++)
332 regs(i) = cd_regs(core_regmap[i]);
336 /* Floating point registers */
338 if (core_reg_size >= sizeof (core_env387))
339 memcpy (&core_env387, core_reg_sect, core_reg_size);
341 fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");