binutils-gdb/gdb/i386m3-nat.c

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/* 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 "floatformat.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 ();
#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 (&registers[REGISTER_BYTE (regnum)], \
REG_ADDRESS (state, regnum), \
count*REGISTER_SIZE)
/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
#define STORE_REGS(state, regnum, count) \
memcpy (REG_ADDRESS (state, regnum), \
&registers[REGISTER_BYTE (regnum)], \
count*REGISTER_SIZE)
/*
* 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)
warning ("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)
{
warning ("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)
warning ("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_unfiltered ("u: ");
print_387_status_word (status);
}
if (ep->status != 0)
{
if (bothstatus)
printf_unfiltered ("e: ");
print_387_status_word (ep->status);
}
print_387_control_word (ep->control);
printf_unfiltered ("last exception: ");
printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
printf_unfiltered ("%s; ", local_hex_string(ep->eip));
printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
printf_unfiltered (":%s\n", local_hex_string(ep->operand));
top = (ep->status >> 11) & 7;
printf_unfiltered ("regno tag msb lsb value\n");
for (fpreg = 7; fpreg >= 0; fpreg--)
{
double val;
printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
switch ((ep->tag >> (fpreg * 2)) & 3)
{
case 0: printf_unfiltered ("valid "); break;
case 1: printf_unfiltered ("zero "); break;
case 2: printf_unfiltered ("trap "); break;
case 3: printf_unfiltered ("empty "); break;
}
for (i = 9; i >= 0; i--)
printf_unfiltered ("%02x", ep->regs[fpreg][i]);
floatformat_to_double (&floatformat_i387_ext, (char *)ep->regs[fpreg],
&val);
printf_unfiltered (" %g\n", val);
}
if (ep->r0)
printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
if (ep->r1)
printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
if (ep->r2)
printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
if (ep->r3)
printf_unfiltered ("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)
{
warning ("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?
*/
memset (fstate, 0, 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)
{
warning ("no floating point status saved");
return;
}
fps = (fpstate_t) buf;
print_387_status (fps->status, (struct env387 *)fps->state);
}