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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);
+}
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