1 /* Low level interface to I386 running mach 3.0.
2 Copyright (C) 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include "floatformat.h"
27 #include <mach/message.h>
28 #include <mach/exception.h>
29 #include <mach_error.h>
31 /* Hmmm... Should this not be here?
32 * Now for i386_float_info() target_has_execution
36 /* This mess is duplicated in bfd/i386mach3.h
38 * This is an ugly way to hack around the incorrect
39 * definition of UPAGES in i386/machparam.h.
41 * The definition should specify the size reserved
42 * for "struct user" in core files in PAGES,
43 * but instead it gives it in 512-byte core-clicks
46 #include <sys/param.h>
48 #define UAREA_SIZE ctob(UPAGES)
50 #define UAREA_SIZE (NBPG*UPAGES)
52 FIXME!! UPAGES is neither 2 nor 16
55 /* @@@ Should move print_387_status() to i387-tdep.c */
56 extern void print_387_control_word (); /* i387-tdep.h */
57 extern void print_387_status_word ();
59 #define private static
62 /* Find offsets to thread states at compile time.
63 * If your compiler does not grok this, calculate offsets
64 * offsets yourself and use them (or get a compatible compiler :-)
67 #define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)
69 /* at reg_offset[i] is the offset to the i386_thread_state
70 * location where the gdb registers[i] is stored.
73 static int reg_offset[] =
75 REG_OFFSET(eax), REG_OFFSET(ecx), REG_OFFSET(edx), REG_OFFSET(ebx),
76 REG_OFFSET(uesp), REG_OFFSET(ebp), REG_OFFSET(esi), REG_OFFSET(edi),
77 REG_OFFSET(eip), REG_OFFSET(efl), REG_OFFSET(cs), REG_OFFSET(ss),
78 REG_OFFSET(ds), REG_OFFSET(es), REG_OFFSET(fs), REG_OFFSET(gs)
81 #define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])
83 /* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
84 * Caller knows that the regs handled in one transaction are of same size.
86 #define FETCH_REGS(state, regnum, count) \
87 memcpy (®isters[REGISTER_BYTE (regnum)], \
88 REG_ADDRESS (state, regnum), \
91 /* Store COUNT contiguous registers to thread STATE starting from REGNUM */
92 #define STORE_REGS(state, regnum, count) \
93 memcpy (REG_ADDRESS (state, regnum), \
94 ®isters[REGISTER_BYTE (regnum)], \
98 * Fetch inferiors registers for gdb.
99 * REGNO specifies which (as gdb views it) register, -1 for all.
103 fetch_inferior_registers (regno)
107 thread_state_data_t state;
108 unsigned int stateCnt = i386_THREAD_STATE_COUNT;
111 if (! MACH_PORT_VALID (current_thread))
112 error ("fetch inferior registers: Invalid thread");
114 if (must_suspend_thread)
115 setup_thread (current_thread, 1);
117 ret = thread_get_state (current_thread,
122 if (ret != KERN_SUCCESS)
123 warning ("fetch_inferior_registers: %s ",
124 mach_error_string (ret));
126 /* It may be more effective to store validate all of them,
127 * since we fetched them all anyway
129 else if (regno != -1)
130 supply_register (regno, (char *)state+reg_offset[regno]);
134 for (index = 0; index < NUM_REGS; index++)
135 supply_register (index, (char *)state+reg_offset[index]);
138 if (must_suspend_thread)
139 setup_thread (current_thread, 0);
142 /* Store our register values back into the inferior.
143 * If REGNO is -1, do this for all registers.
144 * Otherwise, REGNO specifies which register
146 * On mach3 all registers are always saved in one call.
149 store_inferior_registers (regno)
153 thread_state_data_t state;
154 unsigned int stateCnt = i386_THREAD_STATE_COUNT;
157 if (! MACH_PORT_VALID (current_thread))
158 error ("store inferior registers: Invalid thread");
160 if (must_suspend_thread)
161 setup_thread (current_thread, 1);
163 /* Fetch the state of the current thread */
164 ret = thread_get_state (current_thread,
169 if (ret != KERN_SUCCESS)
171 warning ("store_inferior_registers (get): %s",
172 mach_error_string (ret));
173 if (must_suspend_thread)
174 setup_thread (current_thread, 0);
178 /* move gdb's registers to thread's state
180 * Since we save all registers anyway, save the ones
181 * that gdb thinks are valid (e.g. ignore the regno
186 STORE_REGS (state, regno, 1);
190 for (index = 0; index < NUM_REGS; index++)
191 STORE_REGS (state, index, 1);
194 /* Write gdb's current view of register to the thread
196 ret = thread_set_state (current_thread,
199 i386_THREAD_STATE_COUNT);
201 if (ret != KERN_SUCCESS)
202 warning ("store_inferior_registers (set): %s",
203 mach_error_string (ret));
205 if (must_suspend_thread)
206 setup_thread (current_thread, 0);
211 /* Return the address in the core dump or inferior of register REGNO.
212 * BLOCKEND should be the address of the end of the UPAGES area read
213 * in memory, but it's not?
215 * Currently our UX server dumps the whole thread state to the
216 * core file. If your UX does something else, adapt the routine
217 * below to return the offset to the given register.
219 * Called by core-aout.c(fetch_core_registers)
223 register_addr (regno, blockend)
229 if (regno < 0 || regno >= NUM_REGS)
230 error ("Invalid register number %d.", regno);
232 /* UAREA_SIZE == 8 kB in i386 */
233 addr = (unsigned int)REG_ADDRESS (UAREA_SIZE - sizeof(struct i386_thread_state), regno);
239 * gdb/i386-xdep.c. Modifications for Mach 3.0.
241 * i387 status dumper. See also i387-tdep.c
245 unsigned short control;
247 unsigned short status;
252 unsigned short code_seg;
253 unsigned short opcode;
254 unsigned long operand;
255 unsigned short operand_seg;
257 unsigned char regs[8][10];
259 /* This routine is machine independent?
260 * Should move it to i387-tdep.c but you need to export struct env387
263 print_387_status (status, ep)
264 unsigned short status;
273 bothstatus = ((status != 0) && (ep->status != 0));
277 printf_unfiltered ("u: ");
278 print_387_status_word (status);
284 printf_unfiltered ("e: ");
285 print_387_status_word (ep->status);
288 print_387_control_word (ep->control);
289 printf_unfiltered ("last exception: ");
290 printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
291 printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
292 printf_unfiltered ("%s; ", local_hex_string(ep->eip));
293 printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
294 printf_unfiltered (":%s\n", local_hex_string(ep->operand));
296 top = (ep->status >> 11) & 7;
298 printf_unfiltered ("regno tag msb lsb value\n");
299 for (fpreg = 7; fpreg >= 0; fpreg--)
303 printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
305 switch ((ep->tag >> (fpreg * 2)) & 3)
307 case 0: printf_unfiltered ("valid "); break;
308 case 1: printf_unfiltered ("zero "); break;
309 case 2: printf_unfiltered ("trap "); break;
310 case 3: printf_unfiltered ("empty "); break;
312 for (i = 9; i >= 0; i--)
313 printf_unfiltered ("%02x", ep->regs[fpreg][i]);
315 floatformat_to_double (&floatformat_i387_ext, (char *)ep->regs[fpreg],
317 printf_unfiltered (" %g\n", val);
320 printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
322 printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
324 printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
326 printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
330 * values that go into fp_kind (from <i386/fpreg.h>)
332 #define FP_NO 0 /* no fp chip, no emulator (no fp support) */
333 #define FP_SW 1 /* no fp chip, using software emulator */
334 #define FP_HW 2 /* chip present bit */
335 #define FP_287 2 /* 80287 chip present */
336 #define FP_387 3 /* 80387 chip present */
338 typedef struct fpstate {
340 unsigned char state[FP_STATE_BYTES]; /* "hardware" state */
342 struct env387 state; /* Actually this */
344 int status; /* Duplicate status */
347 /* Mach 3 specific routines.
350 get_i387_state (fstate)
351 struct fpstate *fstate;
354 thread_state_data_t state;
355 unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
356 struct i386_float_state *fsp;
358 ret = thread_get_state (current_thread,
363 if (ret != KERN_SUCCESS)
365 warning ("Can not get live floating point state: %s",
366 mach_error_string (ret));
370 fsp = (struct i386_float_state *)state;
371 /* The 387 chip (also 486 counts) or a software emulator? */
372 if (!fsp->initialized || (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
375 /* Clear the target then copy thread's float state there.
376 Make a copy of the status word, for some reason?
378 memset (fstate, 0, sizeof (struct fpstate));
380 fstate->status = fsp->exc_status;
382 memcpy (fstate->state, (char *)&fsp->hw_state, FP_STATE_BYTES);
388 get_i387_core_state (fstate)
389 struct fpstate *fstate;
391 /* Not implemented yet. Core files do not contain float state. */
396 * This is called by "info float" command
399 i386_mach3_float_info()
401 char buf [sizeof (struct fpstate) + 2 * sizeof (int)];
402 boolean_t valid = FALSE;
405 if (target_has_execution)
406 valid = get_i387_state (buf);
408 else if (WE HAVE CORE FILE) /* @@@@ Core files not supported */
409 valid = get_i387_core_state (buf);
414 warning ("no floating point status saved");
418 fps = (fpstate_t) buf;
420 print_387_status (fps->status, (struct env387 *)fps->state);