Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 421 insertions, 0 deletions

diff --git a/gdb/i386m3-nat.c b/gdb/i386m3-nat.c
new file mode 100644
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--- /dev/null
+++ b/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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 core-aout.c(fetch_core_registers)
+ */
+
+CORE_ADDR
+register_addr (regno, blockend)
+     int regno;
+     CORE_ADDR blockend;
+{
+  CORE_ADDR 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);
+}