Initial revision

1 files changed, 357 insertions, 0 deletions

diff --git a/gdb/i386gnu-nat.c b/gdb/i386gnu-nat.c
new file mode 100644
index 00000000000..6ed92c167f5
--- /dev/null
+++ b/gdb/i386gnu-nat.c
@@ -0,0 +1,357 @@
+/* Low level interface to I386 running the GNU Hurd
+   Copyright (C) 1992, 1995, 1996 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "defs.h"
+#include "inferior.h"
+#include "floatformat.h"
+
+#include <stdio.h>
+#include <errno.h>
+
+#include <mach.h>
+#include <mach/message.h>
+#include <mach/exception.h>
+#include <mach_error.h>
+
+#include "gnu-nat.h"
+
+/* Hmmm... Should this not be here?
+ * Now for i386_float_info() target_has_execution
+ */
+#include <target.h>
+
+/* @@@ Should move print_387_status() to i387-tdep.c */
+extern void print_387_control_word ();		/* i387-tdep.h */
+extern void print_387_status_word ();
+
+/* 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_ADDR(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_ADDR (state, regnum), \
+	  count * REGISTER_RAW_SIZE (regnum))
+
+/* Store COUNT contiguous registers to thread STATE starting from REGNUM */
+#define STORE_REGS(state, regnum, count) \
+  memcpy (REG_ADDR (state, regnum), \
+	  &registers[REGISTER_BYTE (regnum)], \
+	  count * REGISTER_RAW_SIZE (regnum))
+
+/*
+ * Fetch inferiors registers for gdb.
+ * REG specifies which (as gdb views it) register, -1 for all.
+ */
+void
+gnu_fetch_registers (int reg)
+{
+  struct proc *thread;
+  thread_state_t state;
+  
+  inf_update_procs (current_inferior); /* Make sure we know about new threads.  */
+
+  thread = inf_tid_to_thread (current_inferior, inferior_pid);
+  if (! thread)
+    error ("fetch inferior registers: %d: Invalid thread", inferior_pid);
+
+  state = proc_get_state (thread, 0);
+
+  if (! state)
+    warning ("Couldn't fetch register %s from %s (invalid thread).",
+	     REGISTER_NAME (reg), proc_string (thread));
+  else if (reg >= 0)
+    {
+      proc_debug (thread, "fetching register: %s", REGISTER_NAME (reg));
+      supply_register (reg, REG_ADDR(state, reg));
+      thread->fetched_regs |= (1 << reg);
+    }
+  else
+    {
+      proc_debug (thread, "fetching all registers");
+      for (reg = 0; reg < NUM_REGS; reg++) 
+	supply_register (reg, REG_ADDR(state, reg));
+      thread->fetched_regs = ~0;
+    }
+}
+
+/* Store our register values back into the inferior.
+ * If REG is -1, do this for all registers.
+ * Otherwise, REG specifies which register
+ *
+ * On mach3 all registers are always saved in one call.
+ */
+void
+gnu_store_registers (reg)
+     int reg;
+{
+  struct proc *thread;
+  int was_aborted, was_valid;
+  thread_state_t state;
+  thread_state_data_t old_state;
+  
+  inf_update_procs (current_inferior); /* Make sure we know about new threads.  */
+
+  thread = inf_tid_to_thread (current_inferior, inferior_pid);
+  if (! thread)
+    error ("store inferior registers: %d: Invalid thread", inferior_pid);
+
+  proc_debug (thread, "storing register %s.", REGISTER_NAME (reg));
+
+  was_aborted = thread->aborted;
+  was_valid = thread->state_valid;
+  if (! was_aborted && was_valid)
+    bcopy (&thread->state, &old_state, sizeof (old_state));
+
+  state = proc_get_state (thread, 1);
+
+  if (! state)
+    warning ("Couldn't store register %s from %s (invalid thread).",
+	     REGISTER_NAME (reg), proc_string (thread));
+  else
+    {
+      if (! was_aborted && was_valid)
+	/* See which registers have changed after aborting the thread.  */
+	{
+	  int check_reg;
+	  for (check_reg = 0; check_reg < NUM_REGS; check_reg++)
+	    if ((thread->fetched_regs & (1 << check_reg))
+		&& bcmp (REG_ADDR (&old_state, check_reg),
+			 REG_ADDR (state, check_reg),
+			 REGISTER_RAW_SIZE (check_reg)))
+	      /* Register CHECK_REG has changed!  Ack!  */
+	      {
+		warning ("Register %s changed after thread was aborted.",
+			 REGISTER_NAME (check_reg));
+		if (reg >= 0 && reg != check_reg)
+		  /* Update gdb's copy of the register.  */
+		  supply_register (check_reg, REG_ADDR (state, check_reg));
+		else
+		  warning ("... also writing this register!  Suspicious...");
+	      }
+	}
+
+      if (reg >= 0)
+	{
+	  proc_debug (thread, "storing register: %s", REGISTER_NAME (reg));
+	  STORE_REGS (state, reg, 1);
+	}
+      else
+	{
+	  proc_debug (thread, "storing all registers");
+	  for (reg = 0; reg < NUM_REGS; reg++) 
+	    STORE_REGS (state, reg, 1);
+	}
+    }
+}
+
+/* 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
+ */
+static
+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.
+ */
+static int
+get_i387_state (fstate)
+     struct fpstate *fstate;
+{
+  error_t err;
+  thread_state_data_t state;
+  unsigned int fsCnt = i386_FLOAT_STATE_COUNT;
+  struct i386_float_state *fsp;
+  struct proc *thread = inf_tid_to_thread (current_inferior, inferior_pid);
+  
+  if (!thread)
+    error ("get_i387_state: Invalid thread");
+
+  proc_abort (thread, 0);	/* Make sure THREAD's in a reasonable state. */
+
+  err = thread_get_state (thread->port, i386_FLOAT_STATE, state, &fsCnt);
+  if (err)
+    {
+      warning ("Can not get live floating point state: %s",
+	       mach_error_string (err));
+      return 0;
+    }
+
+  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 0;
+
+  /* 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 1;
+}
+
+/*
+ * This is called by "info float" command
+ */
+void
+i386_mach3_float_info()
+{
+  char buf [sizeof (struct fpstate) + 2 * sizeof (int)];
+  int valid = 0;
+  fpstate_t fps;
+  
+  if (target_has_execution)
+    valid = get_i387_state (buf);
+
+  if (!valid) 
+    {
+      warning ("no floating point status saved");
+      return;
+    }
+  
+  fps = (fpstate_t) buf;
+
+  print_387_status (fps->status, (struct env387 *)fps->state);
+}