422 lines
11 KiB
C
422 lines
11 KiB
C
/* Low level interface to I386 running mach 3.0.
|
||
Copyright (C) 1992 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
|
||
#include <stdio.h>
|
||
|
||
#include <mach.h>
|
||
#include <mach/message.h>
|
||
#include <mach/exception.h>
|
||
#include <mach_error.h>
|
||
|
||
/* Hmmm... Should this not be here?
|
||
* Now for i386_float_info() target_has_execution
|
||
*/
|
||
#include <target.h>
|
||
|
||
/* This mess is duplicated in bfd/i386mach3.h
|
||
*
|
||
* This is an ugly way to hack around the incorrect
|
||
* definition of UPAGES in i386/machparam.h.
|
||
*
|
||
* The definition should specify the size reserved
|
||
* for "struct user" in core files in PAGES,
|
||
* but instead it gives it in 512-byte core-clicks
|
||
* for i386 and i860.
|
||
*/
|
||
#include <sys/param.h>
|
||
#if UPAGES == 16
|
||
#define UAREA_SIZE ctob(UPAGES)
|
||
#elif UPAGES == 2
|
||
#define UAREA_SIZE (NBPG*UPAGES)
|
||
#else
|
||
FIXME!! UPAGES is neither 2 nor 16
|
||
#endif
|
||
|
||
/* @@@ Should move print_387_status() to i387-tdep.c */
|
||
extern void print_387_control_word (); /* i387-tdep.h */
|
||
extern void print_387_status_word ();
|
||
|
||
extern struct ext_format ext_format_i387;
|
||
|
||
#define private static
|
||
|
||
|
||
/* Find offsets to thread states at compile time.
|
||
* If your compiler does not grok this, calculate offsets
|
||
* offsets yourself and use them (or get a compatible compiler :-)
|
||
*/
|
||
|
||
#define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)
|
||
|
||
/* at reg_offset[i] is the offset to the i386_thread_state
|
||
* location where the gdb registers[i] is stored.
|
||
*/
|
||
|
||
static int reg_offset[] =
|
||
{
|
||
REG_OFFSET(eax), REG_OFFSET(ecx), REG_OFFSET(edx), REG_OFFSET(ebx),
|
||
REG_OFFSET(uesp), REG_OFFSET(ebp), REG_OFFSET(esi), REG_OFFSET(edi),
|
||
REG_OFFSET(eip), REG_OFFSET(efl), REG_OFFSET(cs), REG_OFFSET(ss),
|
||
REG_OFFSET(ds), REG_OFFSET(es), REG_OFFSET(fs), REG_OFFSET(gs)
|
||
};
|
||
|
||
#define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])
|
||
|
||
/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
|
||
* Caller knows that the regs handled in one transaction are of same size.
|
||
*/
|
||
#define FETCH_REGS(state, regnum, count) \
|
||
memcpy (®isters[REGISTER_BYTE (regnum)], \
|
||
REG_ADDRESS (state, regnum), \
|
||
count*sizeof (REGISTER_TYPE))
|
||
|
||
/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
|
||
#define STORE_REGS(state, regnum, count) \
|
||
memcpy (REG_ADDRESS (state, regnum), \
|
||
®isters[REGISTER_BYTE (regnum)], \
|
||
count*sizeof (REGISTER_TYPE))
|
||
|
||
/*
|
||
* Fetch inferiors registers for gdb.
|
||
* REGNO specifies which (as gdb views it) register, -1 for all.
|
||
*/
|
||
|
||
void
|
||
fetch_inferior_registers (regno)
|
||
int regno;
|
||
{
|
||
kern_return_t ret;
|
||
thread_state_data_t state;
|
||
unsigned int stateCnt = i386_THREAD_STATE_COUNT;
|
||
int index;
|
||
|
||
if (! MACH_PORT_VALID (current_thread))
|
||
error ("fetch inferior registers: Invalid thread");
|
||
|
||
if (must_suspend_thread)
|
||
setup_thread (current_thread, 1);
|
||
|
||
ret = thread_get_state (current_thread,
|
||
i386_THREAD_STATE,
|
||
state,
|
||
&stateCnt);
|
||
|
||
if (ret != KERN_SUCCESS)
|
||
message ("fetch_inferior_registers: %s ",
|
||
mach_error_string (ret));
|
||
#if 0
|
||
/* It may be more effective to store validate all of them,
|
||
* since we fetched them all anyway
|
||
*/
|
||
else if (regno != -1)
|
||
supply_register (regno, (char *)state+reg_offset[regno]);
|
||
#endif
|
||
else
|
||
{
|
||
for (index = 0; index < NUM_REGS; index++)
|
||
supply_register (index, (char *)state+reg_offset[index]);
|
||
}
|
||
|
||
if (must_suspend_thread)
|
||
setup_thread (current_thread, 0);
|
||
}
|
||
|
||
/* Store our register values back into the inferior.
|
||
* If REGNO is -1, do this for all registers.
|
||
* Otherwise, REGNO specifies which register
|
||
*
|
||
* On mach3 all registers are always saved in one call.
|
||
*/
|
||
void
|
||
store_inferior_registers (regno)
|
||
int regno;
|
||
{
|
||
kern_return_t ret;
|
||
thread_state_data_t state;
|
||
unsigned int stateCnt = i386_THREAD_STATE_COUNT;
|
||
register int index;
|
||
|
||
if (! MACH_PORT_VALID (current_thread))
|
||
error ("store inferior registers: Invalid thread");
|
||
|
||
if (must_suspend_thread)
|
||
setup_thread (current_thread, 1);
|
||
|
||
/* Fetch the state of the current thread */
|
||
ret = thread_get_state (current_thread,
|
||
i386_THREAD_STATE,
|
||
state,
|
||
&stateCnt);
|
||
|
||
if (ret != KERN_SUCCESS)
|
||
{
|
||
message ("store_inferior_registers (get): %s",
|
||
mach_error_string (ret));
|
||
if (must_suspend_thread)
|
||
setup_thread (current_thread, 0);
|
||
return;
|
||
}
|
||
|
||
/* move gdb's registers to thread's state
|
||
*
|
||
* Since we save all registers anyway, save the ones
|
||
* that gdb thinks are valid (e.g. ignore the regno
|
||
* parameter)
|
||
*/
|
||
#if 0
|
||
if (regno != -1)
|
||
STORE_REGS (state, regno, 1);
|
||
else
|
||
#endif
|
||
{
|
||
for (index = 0; index < NUM_REGS; index++)
|
||
STORE_REGS (state, index, 1);
|
||
}
|
||
|
||
/* Write gdb's current view of register to the thread
|
||
*/
|
||
ret = thread_set_state (current_thread,
|
||
i386_THREAD_STATE,
|
||
state,
|
||
i386_THREAD_STATE_COUNT);
|
||
|
||
if (ret != KERN_SUCCESS)
|
||
message ("store_inferior_registers (set): %s",
|
||
mach_error_string (ret));
|
||
|
||
if (must_suspend_thread)
|
||
setup_thread (current_thread, 0);
|
||
}
|
||
|
||
|
||
|
||
/* Return the address in the core dump or inferior of register REGNO.
|
||
* BLOCKEND should be the address of the end of the UPAGES area read
|
||
* in memory, but it's not?
|
||
*
|
||
* Currently our UX server dumps the whole thread state to the
|
||
* core file. If your UX does something else, adapt the routine
|
||
* below to return the offset to the given register.
|
||
*
|
||
* Called by coredep.c(fetch_core_registers)
|
||
*/
|
||
|
||
unsigned int
|
||
register_addr (regno, blockend)
|
||
int regno;
|
||
int blockend;
|
||
{
|
||
unsigned int addr;
|
||
|
||
if (regno < 0 || regno >= NUM_REGS)
|
||
error ("Invalid register number %d.", regno);
|
||
|
||
/* UAREA_SIZE == 8 kB in i386 */
|
||
addr = (unsigned int)REG_ADDRESS (UAREA_SIZE - sizeof(struct i386_thread_state), regno);
|
||
|
||
return addr;
|
||
}
|
||
|
||
/* jtv@hut.fi: I copied and modified this 387 code from
|
||
* gdb/i386-xdep.c. Modifications for Mach 3.0.
|
||
*
|
||
* i387 status dumper. See also i387-tdep.c
|
||
*/
|
||
struct env387
|
||
{
|
||
unsigned short control;
|
||
unsigned short r0;
|
||
unsigned short status;
|
||
unsigned short r1;
|
||
unsigned short tag;
|
||
unsigned short r2;
|
||
unsigned long eip;
|
||
unsigned short code_seg;
|
||
unsigned short opcode;
|
||
unsigned long operand;
|
||
unsigned short operand_seg;
|
||
unsigned short r3;
|
||
unsigned char regs[8][10];
|
||
};
|
||
/* This routine is machine independent?
|
||
* Should move it to i387-tdep.c but you need to export struct env387
|
||
*/
|
||
private
|
||
print_387_status (status, ep)
|
||
unsigned short status;
|
||
struct env387 *ep;
|
||
{
|
||
int i;
|
||
int bothstatus;
|
||
int top;
|
||
int fpreg;
|
||
unsigned char *p;
|
||
|
||
bothstatus = ((status != 0) && (ep->status != 0));
|
||
if (status != 0)
|
||
{
|
||
if (bothstatus)
|
||
printf ("u: ");
|
||
print_387_status_word (status);
|
||
}
|
||
|
||
if (ep->status != 0)
|
||
{
|
||
if (bothstatus)
|
||
printf ("e: ");
|
||
print_387_status_word (ep->status);
|
||
}
|
||
|
||
print_387_control_word (ep->control);
|
||
printf ("last exception: ");
|
||
printf ("opcode %s; ", local_hex_string(ep->opcode));
|
||
printf ("pc %s:", local_hex_string(ep->code_seg));
|
||
printf ("%s; ", local_hex_string(ep->eip));
|
||
printf ("operand %s", local_hex_string(ep->operand_seg));
|
||
printf (":%s\n", local_hex_string(ep->operand));
|
||
|
||
top = (ep->status >> 11) & 7;
|
||
|
||
printf ("regno tag msb lsb value\n");
|
||
for (fpreg = 7; fpreg >= 0; fpreg--)
|
||
{
|
||
double val;
|
||
|
||
printf ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
|
||
|
||
switch ((ep->tag >> (fpreg * 2)) & 3)
|
||
{
|
||
case 0: printf ("valid "); break;
|
||
case 1: printf ("zero "); break;
|
||
case 2: printf ("trap "); break;
|
||
case 3: printf ("empty "); break;
|
||
}
|
||
for (i = 9; i >= 0; i--)
|
||
printf ("%02x", ep->regs[fpreg][i]);
|
||
|
||
ieee_extended_to_double (&ext_format_i387, (char *)ep->regs[fpreg],
|
||
&val);
|
||
printf (" %g\n", val);
|
||
}
|
||
if (ep->r0)
|
||
printf ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
|
||
if (ep->r1)
|
||
printf ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
|
||
if (ep->r2)
|
||
printf ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
|
||
if (ep->r3)
|
||
printf ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
|
||
}
|
||
|
||
/*
|
||
* values that go into fp_kind (from <i386/fpreg.h>)
|
||
*/
|
||
#define FP_NO 0 /* no fp chip, no emulator (no fp support) */
|
||
#define FP_SW 1 /* no fp chip, using software emulator */
|
||
#define FP_HW 2 /* chip present bit */
|
||
#define FP_287 2 /* 80287 chip present */
|
||
#define FP_387 3 /* 80387 chip present */
|
||
|
||
typedef struct fpstate {
|
||
#if 1
|
||
unsigned char state[FP_STATE_BYTES]; /* "hardware" state */
|
||
#else
|
||
struct env387 state; /* Actually this */
|
||
#endif
|
||
int status; /* Duplicate status */
|
||
} *fpstate_t;
|
||
|
||
/* Mach 3 specific routines.
|
||
*/
|
||
private boolean_t
|
||
get_i387_state (fstate)
|
||
struct fpstate *fstate;
|
||
{
|
||
kern_return_t ret;
|
||
thread_state_data_t state;
|
||
unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
|
||
struct i386_float_state *fsp;
|
||
|
||
ret = thread_get_state (current_thread,
|
||
i386_FLOAT_STATE,
|
||
state,
|
||
&fsCnt);
|
||
|
||
if (ret != KERN_SUCCESS)
|
||
{
|
||
message ("Can not get live floating point state: %s",
|
||
mach_error_string (ret));
|
||
return FALSE;
|
||
}
|
||
|
||
fsp = (struct i386_float_state *)state;
|
||
/* The 387 chip (also 486 counts) or a software emulator? */
|
||
if (!fsp->initialized || (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
|
||
return FALSE;
|
||
|
||
/* Clear the target then copy thread's float state there.
|
||
Make a copy of the status word, for some reason?
|
||
*/
|
||
bzero (fstate, sizeof(struct fpstate));
|
||
|
||
fstate->status = fsp->exc_status;
|
||
|
||
memcpy (fstate->state, (char *)&fsp->hw_state, FP_STATE_BYTES);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
private boolean_t
|
||
get_i387_core_state (fstate)
|
||
struct fpstate *fstate;
|
||
{
|
||
/* Not implemented yet. Core files do not contain float state. */
|
||
return FALSE;
|
||
}
|
||
|
||
/*
|
||
* This is called by "info float" command
|
||
*/
|
||
void
|
||
i386_mach3_float_info()
|
||
{
|
||
char buf [sizeof (struct fpstate) + 2 * sizeof (int)];
|
||
boolean_t valid = FALSE;
|
||
fpstate_t fps;
|
||
|
||
if (target_has_execution)
|
||
valid = get_i387_state (buf);
|
||
#if 0
|
||
else if (WE HAVE CORE FILE) /* @@@@ Core files not supported */
|
||
valid = get_i387_core_state (buf);
|
||
#endif
|
||
|
||
if (!valid)
|
||
{
|
||
message("no floating point status saved");
|
||
return;
|
||
}
|
||
|
||
fps = (fpstate_t) buf;
|
||
|
||
print_387_status (fps->status, (struct env387 *)fps->state);
|
||
}
|