342 lines
9.4 KiB
C
342 lines
9.4 KiB
C
/* Low level interface to i386 running the GNU Hurd.
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Copyright (C) 1992, 1995, 1996, 2000 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,
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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 <assert.h>
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#include <stdio.h>
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#include <errno.h>
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#include <mach.h>
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#include <mach_error.h>
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#include <mach/message.h>
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#include <mach/exception.h>
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#include "gnu-nat.h"
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/* The FPU hardware state. */
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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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/* Offset to the thread_state_t location where REG is stored. */
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#define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
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/* At reg_offset[i] is the offset to the thread_state_t location where
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the gdb registers[i] is stored. */
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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_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
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/* Get the whole floating-point state of THREAD and record the
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values of the corresponding (pseudo) registers. */
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static void
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fetch_fpregs (struct proc *thread)
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{
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mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
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struct i386_float_state state;
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struct env387 *ep = (struct env387 *) state.hw_state;
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error_t err;
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int i;
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err = thread_get_state (thread->port, i386_FLOAT_STATE,
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(thread_state_t) &state, &count);
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if (err)
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{
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warning ("Couldn't fetch floating-point state from %s",
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proc_string (thread));
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return;
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}
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if (! state.initialized)
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/* The floating-point state isn't initialized. */
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{
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for (i = FP0_REGNUM; i <= FP7_REGNUM; i++)
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supply_register (i, NULL);
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for (i = FIRST_FPU_CTRL_REGNUM; i <= LAST_FPU_CTRL_REGNUM; i++)
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supply_register (i, NULL);
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return;
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}
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/* Supply the floating-point registers. */
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for (i = 0; i < 8; i++)
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supply_register (FP0_REGNUM + i, ep->regs[i]);
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supply_register (FCTRL_REGNUM, (char *) &ep->control);
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supply_register (FSTAT_REGNUM, (char *) &ep->status);
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supply_register (FTAG_REGNUM, (char *) &ep->tag);
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supply_register (FCOFF_REGNUM, (char *) &ep->eip);
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supply_register (FDS_REGNUM, (char *) &ep->operand_seg);
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supply_register (FDOFF_REGNUM, (char *) &ep->operand);
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/* Store the code segment and opcode pseudo registers. */
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{
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long l;
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l = ep->code_seg;
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supply_register (FCS_REGNUM, (char *) &l);
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l = ep->opcode & ((1 << 11) - 1);
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supply_register (FOP_REGNUM, (char *) &l);
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}
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}
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/* Fetch register REGNO, or all regs if REGNO is -1. */
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void
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gnu_fetch_registers (int regno)
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{
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struct proc *thread;
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/* Make sure we know about new threads. */
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inf_update_procs (current_inferior);
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thread = inf_tid_to_thread (current_inferior, inferior_pid);
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if (!thread)
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error ("Can't fetch registers from thread %d: No such thread",
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inferior_pid);
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if (regno < NUM_GREGS || regno == -1)
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{
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thread_state_t state;
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/* This does the dirty work for us. */
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state = proc_get_state (thread, 0);
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if (!state)
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{
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warning ("Couldn't fetch registers from %s",
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proc_string (thread));
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return;
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}
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if (regno == -1)
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{
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int i;
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proc_debug (thread, "fetching all register");
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for (i = 0; i < NUM_GREGS; i++)
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supply_register (i, REG_ADDR (state, i));
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thread->fetched_regs = ~0;
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}
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else
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{
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proc_debug (thread, "fetching register %s", REGISTER_NAME (regno));
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supply_register (regno, REG_ADDR (state, regno));
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thread->fetched_regs |= (1 << regno);
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}
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}
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if (regno >= NUM_GREGS || regno == -1)
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{
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proc_debug (thread, "fetching floating-point registers");
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fetch_fpregs (thread);
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}
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}
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/* Fill the i387 hardware state EP with selected data from the set of
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(pseudo) registers specified by REGS and VALID. VALID is an array
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indicating which registers in REGS are valid. If VALID is zero,
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all registers are assumed to be valid. */
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static void
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convert_to_env387 (struct env387 *ep, char *regs, signed char *valid)
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{
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int i;
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/* Fill in the floating-point registers. */
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for (i = 0; i < 8; i++)
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if (!valid || valid[i])
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memcpy (ep->regs[i], ®s[REGISTER_BYTE (FP0_REGNUM + i)],
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REGISTER_RAW_SIZE (FP0_REGNUM + i));
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#define fill(member, regno) \
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if (!valid || valid[(regno)]) \
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memcpy (&ep->member, ®s[REGISTER_BYTE (regno)], \
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sizeof (ep->member));
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fill (control, FCTRL_REGNUM);
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fill (status, FSTAT_REGNUM);
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fill (tag, FTAG_REGNUM);
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fill (eip, FCOFF_REGNUM);
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fill (operand, FDOFF_REGNUM);
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fill (operand_seg, FDS_REGNUM);
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#undef fill
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if (!valid || valid[FCS_REGNUM])
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ep->code_seg =
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(* (int *) ®isters[REGISTER_BYTE (FCS_REGNUM)] & 0xffff);
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if (!valid || valid[FOP_REGNUM])
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ep->opcode =
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((* (int *) ®isters[REGISTER_BYTE (FOP_REGNUM)] & ((1 << 11) - 1)));
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}
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/* Store the whole floating-point state into THREAD using information
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from the corresponding (pseudo) registers. */
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static void
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store_fpregs (struct proc *thread)
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{
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mach_msg_type_number_t count = i386_FLOAT_STATE_COUNT;
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struct i386_float_state state;
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error_t err;
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err = thread_get_state (thread->port, i386_FLOAT_STATE,
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(thread_state_t) &state, &count);
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if (err)
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{
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warning ("Couldn't fetch floating-point state from %s",
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proc_string (thread));
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return;
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}
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convert_to_env387 ((struct env387 *) state.hw_state,
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registers, register_valid);
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err = thread_set_state (thread->port, i386_FLOAT_STATE,
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(thread_state_t) &state, i386_FLOAT_STATE_COUNT);
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if (err)
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{
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warning ("Couldn't store floating-point state into %s",
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proc_string (thread));
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return;
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}
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}
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/* Store at least register REGNO, or all regs if REGNO == -1. */
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void
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gnu_store_registers (int regno)
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{
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struct proc *thread;
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/* Make sure we know about new threads. */
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inf_update_procs (current_inferior);
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thread = inf_tid_to_thread (current_inferior, inferior_pid);
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if (!thread)
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error ("Couldn't store registers into thread %d: No such thread",
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inferior_pid);
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if (regno < NUM_GREGS || regno == -1)
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{
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thread_state_t state;
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thread_state_data_t old_state;
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int was_aborted = thread->aborted;
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int was_valid = thread->state_valid;
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int trace;
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if (!was_aborted && was_valid)
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memcpy (&old_state, &thread->state, sizeof (old_state));
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state = proc_get_state (thread, 1);
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if (!state)
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{
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warning ("Couldn't store registers into %s", proc_string (thread));
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return;
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}
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/* Save the T bit. We might try to restore the %eflags register
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below, but changing the T bit would seriously confuse GDB. */
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trace = ((struct i386_thread_state *)state)->efl & 0x100;
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if (!was_aborted && was_valid)
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/* See which registers have changed after aborting the thread. */
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{
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int check_regno;
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for (check_regno = 0; check_regno < NUM_GREGS; check_regno++)
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if ((thread->fetched_regs & (1 << check_regno))
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&& memcpy (REG_ADDR (&old_state, check_regno),
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REG_ADDR (state, check_regno),
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REGISTER_RAW_SIZE (check_regno)))
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/* Register CHECK_REGNO has changed! Ack! */
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{
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warning ("Register %s changed after the thread was aborted",
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REGISTER_NAME (check_regno));
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if (regno >= 0 && regno != check_regno)
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/* Update gdb's copy of the register. */
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supply_register (check_regno, REG_ADDR (state, check_regno));
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else
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warning ("... also writing this register! Suspicious...");
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}
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}
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#define fill(state, regno) \
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memcpy (REG_ADDR(state, regno), ®isters[REGISTER_BYTE (regno)], \
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REGISTER_RAW_SIZE (regno))
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if (regno == -1)
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{
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int i;
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proc_debug (thread, "storing all registers");
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for (i = 0; i < NUM_GREGS; i++)
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if (register_valid[i])
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fill (state, i);
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}
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else
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{
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proc_debug (thread, "storing register %s", REGISTER_NAME (regno));
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assert (register_valid[regno]);
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fill (state, regno);
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}
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/* Restore the T bit. */
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((struct i386_thread_state *)state)->efl &= ~0x100;
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((struct i386_thread_state *)state)->efl |= trace;
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}
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#undef fill
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if (regno >= NUM_GREGS || regno == -1)
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{
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proc_debug (thread, "storing floating-point registers");
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store_fpregs (thread);
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}
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}
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