422 lines
11 KiB
C
422 lines
11 KiB
C
/* Low level interface to I386 running mach 3.0.
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Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "inferior.h"
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#include "floatformat.h"
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#include <stdio.h>
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#include <mach.h>
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#include <mach/message.h>
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#include <mach/exception.h>
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#include <mach_error.h>
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/* Hmmm... Should this not be here?
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* Now for i386_float_info() target_has_execution
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*/
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#include <target.h>
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/* This mess is duplicated in bfd/i386mach3.h
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*
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* This is an ugly way to hack around the incorrect
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* definition of UPAGES in i386/machparam.h.
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*
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* The definition should specify the size reserved
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* for "struct user" in core files in PAGES,
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* but instead it gives it in 512-byte core-clicks
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* for i386 and i860.
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*/
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#include <sys/param.h>
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#if UPAGES == 16
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#define UAREA_SIZE ctob(UPAGES)
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#elif UPAGES == 2
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#define UAREA_SIZE (NBPG*UPAGES)
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#else
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FIXME!! UPAGES is neither 2 nor 16
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#endif
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/* @@@ Should move print_387_status() to i387-tdep.c */
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extern void print_387_control_word (); /* i387-tdep.h */
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extern void print_387_status_word ();
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#define private static
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/* Find offsets to thread states at compile time.
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* If your compiler does not grok this, calculate offsets
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* offsets yourself and use them (or get a compatible compiler :-)
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*/
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#define REG_OFFSET(reg) (int)(&((struct i386_thread_state *)0)->reg)
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/* at reg_offset[i] is the offset to the i386_thread_state
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* location where the gdb registers[i] is stored.
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*/
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static int reg_offset[] =
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{
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REG_OFFSET(eax), REG_OFFSET(ecx), REG_OFFSET(edx), REG_OFFSET(ebx),
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REG_OFFSET(uesp), REG_OFFSET(ebp), REG_OFFSET(esi), REG_OFFSET(edi),
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REG_OFFSET(eip), REG_OFFSET(efl), REG_OFFSET(cs), REG_OFFSET(ss),
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REG_OFFSET(ds), REG_OFFSET(es), REG_OFFSET(fs), REG_OFFSET(gs)
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};
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#define REG_ADDRESS(state,regnum) ((char *)(state)+reg_offset[regnum])
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/* Fetch COUNT contiguous registers from thread STATE starting from REGNUM
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* Caller knows that the regs handled in one transaction are of same size.
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*/
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#define FETCH_REGS(state, regnum, count) \
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memcpy (®isters[REGISTER_BYTE (regnum)], \
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REG_ADDRESS (state, regnum), \
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count*REGISTER_SIZE)
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/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
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#define STORE_REGS(state, regnum, count) \
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memcpy (REG_ADDRESS (state, regnum), \
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®isters[REGISTER_BYTE (regnum)], \
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count*REGISTER_SIZE)
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/*
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* Fetch inferiors registers for gdb.
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* REGNO specifies which (as gdb views it) register, -1 for all.
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*/
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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kern_return_t ret;
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thread_state_data_t state;
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unsigned int stateCnt = i386_THREAD_STATE_COUNT;
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int index;
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if (! MACH_PORT_VALID (current_thread))
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error ("fetch inferior registers: Invalid thread");
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if (must_suspend_thread)
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setup_thread (current_thread, 1);
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ret = thread_get_state (current_thread,
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i386_THREAD_STATE,
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state,
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&stateCnt);
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if (ret != KERN_SUCCESS)
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warning ("fetch_inferior_registers: %s ",
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mach_error_string (ret));
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#if 0
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/* It may be more effective to store validate all of them,
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* since we fetched them all anyway
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*/
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else if (regno != -1)
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supply_register (regno, (char *)state+reg_offset[regno]);
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#endif
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else
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{
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for (index = 0; index < NUM_REGS; index++)
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supply_register (index, (char *)state+reg_offset[index]);
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}
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if (must_suspend_thread)
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setup_thread (current_thread, 0);
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}
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/* Store our register values back into the inferior.
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* If REGNO is -1, do this for all registers.
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* Otherwise, REGNO specifies which register
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*
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* On mach3 all registers are always saved in one call.
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*/
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void
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store_inferior_registers (regno)
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int regno;
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{
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kern_return_t ret;
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thread_state_data_t state;
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unsigned int stateCnt = i386_THREAD_STATE_COUNT;
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register int index;
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if (! MACH_PORT_VALID (current_thread))
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error ("store inferior registers: Invalid thread");
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if (must_suspend_thread)
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setup_thread (current_thread, 1);
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/* Fetch the state of the current thread */
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ret = thread_get_state (current_thread,
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i386_THREAD_STATE,
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state,
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&stateCnt);
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if (ret != KERN_SUCCESS)
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{
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warning ("store_inferior_registers (get): %s",
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mach_error_string (ret));
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if (must_suspend_thread)
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setup_thread (current_thread, 0);
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return;
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}
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/* move gdb's registers to thread's state
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*
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* Since we save all registers anyway, save the ones
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* that gdb thinks are valid (e.g. ignore the regno
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* parameter)
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*/
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#if 0
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if (regno != -1)
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STORE_REGS (state, regno, 1);
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else
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#endif
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{
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for (index = 0; index < NUM_REGS; index++)
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STORE_REGS (state, index, 1);
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}
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/* Write gdb's current view of register to the thread
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*/
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ret = thread_set_state (current_thread,
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i386_THREAD_STATE,
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state,
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i386_THREAD_STATE_COUNT);
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if (ret != KERN_SUCCESS)
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warning ("store_inferior_registers (set): %s",
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mach_error_string (ret));
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if (must_suspend_thread)
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setup_thread (current_thread, 0);
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}
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/* Return the address in the core dump or inferior of register REGNO.
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* BLOCKEND should be the address of the end of the UPAGES area read
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* in memory, but it's not?
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*
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* Currently our UX server dumps the whole thread state to the
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* core file. If your UX does something else, adapt the routine
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* below to return the offset to the given register.
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*
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* Called by core-aout.c(fetch_core_registers)
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*/
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unsigned int
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register_addr (regno, blockend)
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int regno;
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int blockend;
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{
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unsigned int addr;
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if (regno < 0 || regno >= NUM_REGS)
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error ("Invalid register number %d.", regno);
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/* UAREA_SIZE == 8 kB in i386 */
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addr = (unsigned int)REG_ADDRESS (UAREA_SIZE - sizeof(struct i386_thread_state), regno);
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return addr;
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}
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/* jtv@hut.fi: I copied and modified this 387 code from
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* gdb/i386-xdep.c. Modifications for Mach 3.0.
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*
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* i387 status dumper. See also i387-tdep.c
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*/
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struct env387
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{
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unsigned short control;
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unsigned short r0;
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unsigned short status;
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unsigned short r1;
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unsigned short tag;
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unsigned short r2;
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unsigned long eip;
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unsigned short code_seg;
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unsigned short opcode;
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unsigned long operand;
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unsigned short operand_seg;
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unsigned short r3;
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unsigned char regs[8][10];
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};
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/* This routine is machine independent?
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* Should move it to i387-tdep.c but you need to export struct env387
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*/
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private
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print_387_status (status, ep)
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unsigned short status;
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struct env387 *ep;
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{
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int i;
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int bothstatus;
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int top;
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int fpreg;
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unsigned char *p;
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bothstatus = ((status != 0) && (ep->status != 0));
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if (status != 0)
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{
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if (bothstatus)
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printf_unfiltered ("u: ");
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print_387_status_word (status);
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}
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if (ep->status != 0)
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{
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if (bothstatus)
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printf_unfiltered ("e: ");
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print_387_status_word (ep->status);
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}
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print_387_control_word (ep->control);
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printf_unfiltered ("last exception: ");
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printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
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printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
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printf_unfiltered ("%s; ", local_hex_string(ep->eip));
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printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
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printf_unfiltered (":%s\n", local_hex_string(ep->operand));
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top = (ep->status >> 11) & 7;
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printf_unfiltered ("regno tag msb lsb value\n");
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for (fpreg = 7; fpreg >= 0; fpreg--)
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{
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double val;
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printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
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switch ((ep->tag >> (fpreg * 2)) & 3)
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{
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case 0: printf_unfiltered ("valid "); break;
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case 1: printf_unfiltered ("zero "); break;
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case 2: printf_unfiltered ("trap "); break;
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case 3: printf_unfiltered ("empty "); break;
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}
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for (i = 9; i >= 0; i--)
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printf_unfiltered ("%02x", ep->regs[fpreg][i]);
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floatformat_to_double (&floatformat_i387_ext, (char *)ep->regs[fpreg],
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&val);
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printf_unfiltered (" %g\n", val);
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}
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if (ep->r0)
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printf_unfiltered ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
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if (ep->r1)
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printf_unfiltered ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
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if (ep->r2)
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printf_unfiltered ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
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if (ep->r3)
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printf_unfiltered ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
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}
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/*
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* values that go into fp_kind (from <i386/fpreg.h>)
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*/
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#define FP_NO 0 /* no fp chip, no emulator (no fp support) */
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#define FP_SW 1 /* no fp chip, using software emulator */
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#define FP_HW 2 /* chip present bit */
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#define FP_287 2 /* 80287 chip present */
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#define FP_387 3 /* 80387 chip present */
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typedef struct fpstate {
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#if 1
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unsigned char state[FP_STATE_BYTES]; /* "hardware" state */
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#else
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struct env387 state; /* Actually this */
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#endif
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int status; /* Duplicate status */
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} *fpstate_t;
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/* Mach 3 specific routines.
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*/
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private boolean_t
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get_i387_state (fstate)
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struct fpstate *fstate;
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{
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kern_return_t ret;
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thread_state_data_t state;
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unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
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struct i386_float_state *fsp;
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ret = thread_get_state (current_thread,
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i386_FLOAT_STATE,
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state,
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&fsCnt);
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if (ret != KERN_SUCCESS)
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{
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warning ("Can not get live floating point state: %s",
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mach_error_string (ret));
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return FALSE;
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}
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fsp = (struct i386_float_state *)state;
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/* The 387 chip (also 486 counts) or a software emulator? */
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if (!fsp->initialized || (fsp->fpkind != FP_387 && fsp->fpkind != FP_SW))
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return FALSE;
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/* Clear the target then copy thread's float state there.
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Make a copy of the status word, for some reason?
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*/
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memset (fstate, 0, sizeof (struct fpstate));
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fstate->status = fsp->exc_status;
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memcpy (fstate->state, (char *)&fsp->hw_state, FP_STATE_BYTES);
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return TRUE;
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}
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private boolean_t
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get_i387_core_state (fstate)
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struct fpstate *fstate;
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{
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/* Not implemented yet. Core files do not contain float state. */
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return FALSE;
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}
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/*
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* This is called by "info float" command
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*/
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void
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i386_mach3_float_info()
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{
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char buf [sizeof (struct fpstate) + 2 * sizeof (int)];
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boolean_t valid = FALSE;
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fpstate_t fps;
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if (target_has_execution)
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valid = get_i387_state (buf);
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#if 0
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else if (WE HAVE CORE FILE) /* @@@@ Core files not supported */
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valid = get_i387_core_state (buf);
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#endif
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if (!valid)
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{
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warning ("no floating point status saved");
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return;
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}
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fps = (fpstate_t) buf;
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print_387_status (fps->status, (struct env387 *)fps->state);
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}
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