674 lines
18 KiB
C
674 lines
18 KiB
C
/* Target dependent code for the NS32000, for GDB.
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Copyright 1986, 1988, 1991, 1992, 1994, 1995, 1998, 1999, 2000, 2001,
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2002 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 "frame.h"
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#include "gdbtypes.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "target.h"
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#include "arch-utils.h"
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#include "ns32k-tdep.h"
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static int sign_extend (int value, int bits);
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static CORE_ADDR ns32k_get_enter_addr (CORE_ADDR);
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static int ns32k_localcount (CORE_ADDR enter_pc);
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static void flip_bytes (void *, int);
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static const char *
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ns32k_register_name_32082 (int regno)
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{
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static char *register_names[] =
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{
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
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"sp", "fp", "pc", "ps",
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"l0", "l1", "l2", "l3", "xx",
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};
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if (regno < 0)
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return NULL;
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if (regno >= sizeof (register_names) / sizeof (*register_names))
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return NULL;
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return (register_names[regno]);
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}
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static const char *
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ns32k_register_name_32382 (int regno)
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{
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static char *register_names[] =
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{
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
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"sp", "fp", "pc", "ps",
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"fsr",
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"l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7", "xx",
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};
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if (regno < 0)
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return NULL;
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if (regno >= sizeof (register_names) / sizeof (*register_names))
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return NULL;
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return (register_names[regno]);
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}
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static int
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ns32k_register_byte_32082 (int regno)
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{
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if (regno >= NS32K_LP0_REGNUM)
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return (NS32K_LP0_REGNUM * 4) + ((regno - NS32K_LP0_REGNUM) * 8);
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return (regno * 4);
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}
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static int
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ns32k_register_byte_32382 (int regno)
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{
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/* This is a bit yuk. The even numbered double precision floating
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point long registers occupy the same space as the even:odd numbered
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single precision floating point registers, but the extra 32381 FPU
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registers are at the end. Doing it this way is compatible for both
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32081 and 32381 equipped machines. */
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return ((regno < NS32K_LP0_REGNUM ? regno
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: (regno - NS32K_LP0_REGNUM) & 1 ? regno - 1
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: (regno - NS32K_LP0_REGNUM + FP0_REGNUM)) * 4);
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}
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static int
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ns32k_register_raw_size (int regno)
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{
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/* All registers are 4 bytes, except for the doubled floating
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registers. */
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return ((regno >= NS32K_LP0_REGNUM) ? 8 : 4);
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}
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static int
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ns32k_register_virtual_size (int regno)
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{
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return ((regno >= NS32K_LP0_REGNUM) ? 8 : 4);
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}
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static struct type *
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ns32k_register_virtual_type (int regno)
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{
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if (regno < FP0_REGNUM)
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return (builtin_type_int);
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if (regno < FP0_REGNUM + 8)
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return (builtin_type_float);
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if (regno < NS32K_LP0_REGNUM)
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return (builtin_type_int);
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return (builtin_type_double);
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}
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/* Immediately after a function call, return the saved PC. Can't
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always go through the frames for this because on some systems,
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the new frame is not set up until the new function executes some
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instructions. */
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static CORE_ADDR
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ns32k_saved_pc_after_call (struct frame_info *frame)
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{
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return (read_memory_integer (read_register (SP_REGNUM), 4));
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}
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/* Advance PC across any function entry prologue instructions
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to reach some "real" code. */
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static CORE_ADDR
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umax_skip_prologue (CORE_ADDR pc)
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{
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register unsigned char op = read_memory_integer (pc, 1);
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if (op == 0x82)
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{
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op = read_memory_integer (pc + 2, 1);
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if ((op & 0x80) == 0)
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pc += 3;
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else if ((op & 0xc0) == 0x80)
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pc += 4;
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else
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pc += 6;
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}
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return pc;
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}
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static const unsigned char *
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ns32k_breakpoint_from_pc (CORE_ADDR *pcp, int *lenp)
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{
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static const unsigned char breakpoint_insn[] = { 0xf2 };
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*lenp = sizeof (breakpoint_insn);
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return breakpoint_insn;
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}
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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell.
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Encore's C compiler often reuses same area on stack for args,
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so this will often not work properly. If the arg names
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are known, it's likely most of them will be printed. */
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static int
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umax_frame_num_args (struct frame_info *fi)
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{
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int numargs;
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CORE_ADDR pc;
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CORE_ADDR enter_addr;
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unsigned int insn;
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unsigned int addr_mode;
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int width;
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numargs = -1;
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enter_addr = ns32k_get_enter_addr ((fi)->pc);
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if (enter_addr > 0)
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{
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pc = ((enter_addr == 1)
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? SAVED_PC_AFTER_CALL (fi)
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: FRAME_SAVED_PC (fi));
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insn = read_memory_integer (pc, 2);
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addr_mode = (insn >> 11) & 0x1f;
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insn = insn & 0x7ff;
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if ((insn & 0x7fc) == 0x57c
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&& addr_mode == 0x14) /* immediate */
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{
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if (insn == 0x57c) /* adjspb */
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width = 1;
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else if (insn == 0x57d) /* adjspw */
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width = 2;
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else if (insn == 0x57f) /* adjspd */
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width = 4;
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else
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internal_error (__FILE__, __LINE__, "bad else");
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numargs = read_memory_integer (pc + 2, width);
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if (width > 1)
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flip_bytes (&numargs, width);
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numargs = -sign_extend (numargs, width * 8) / 4;
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}
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}
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return numargs;
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}
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static int
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sign_extend (int value, int bits)
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{
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value = value & ((1 << bits) - 1);
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return (value & (1 << (bits - 1))
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? value | (~((1 << bits) - 1))
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: value);
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}
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static void
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flip_bytes (void *p, int count)
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{
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char tmp;
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char *ptr = 0;
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while (count > 0)
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{
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tmp = *ptr;
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ptr[0] = ptr[count - 1];
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ptr[count - 1] = tmp;
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ptr++;
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count -= 2;
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}
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}
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/* Return the number of locals in the current frame given a
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pc pointing to the enter instruction. This is used by
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ns32k_frame_init_saved_regs. */
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static int
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ns32k_localcount (CORE_ADDR enter_pc)
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{
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unsigned char localtype;
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int localcount;
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localtype = read_memory_integer (enter_pc + 2, 1);
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if ((localtype & 0x80) == 0)
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localcount = localtype;
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else if ((localtype & 0xc0) == 0x80)
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localcount = (((localtype & 0x3f) << 8)
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| (read_memory_integer (enter_pc + 3, 1) & 0xff));
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else
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localcount = (((localtype & 0x3f) << 24)
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| ((read_memory_integer (enter_pc + 3, 1) & 0xff) << 16)
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| ((read_memory_integer (enter_pc + 4, 1) & 0xff) << 8)
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| (read_memory_integer (enter_pc + 5, 1) & 0xff));
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return localcount;
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}
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/* Nonzero if instruction at PC is a return instruction. */
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static int
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ns32k_about_to_return (CORE_ADDR pc)
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{
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return (read_memory_integer (pc, 1) == 0x12);
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}
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/* Get the address of the enter opcode for this function, if it is active.
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Returns positive address > 1 if pc is between enter/exit,
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1 if pc before enter or after exit, 0 otherwise. */
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static CORE_ADDR
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ns32k_get_enter_addr (CORE_ADDR pc)
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{
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CORE_ADDR enter_addr;
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unsigned char op;
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if (pc == 0)
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return 0;
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if (ns32k_about_to_return (pc))
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return 1; /* after exit */
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enter_addr = get_pc_function_start (pc);
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if (pc == enter_addr)
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return 1; /* before enter */
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op = read_memory_integer (enter_addr, 1);
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if (op != 0x82)
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return 0; /* function has no enter/exit */
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return enter_addr; /* pc is between enter and exit */
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}
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static CORE_ADDR
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ns32k_frame_chain (struct frame_info *frame)
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{
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/* In the case of the NS32000 series, the frame's nominal address is the
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FP value, and that address is saved at the previous FP value as a
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4-byte word. */
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if (inside_entry_file (frame->pc))
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return 0;
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return (read_memory_integer (frame->frame, 4));
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}
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static CORE_ADDR
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ns32k_frame_saved_pc (struct frame_info *frame)
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{
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if (frame->signal_handler_caller)
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return (sigtramp_saved_pc (frame)); /* XXXJRT */
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return (read_memory_integer (frame->frame + 4, 4));
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}
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static CORE_ADDR
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ns32k_frame_args_address (struct frame_info *frame)
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{
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if (ns32k_get_enter_addr (frame->pc) > 1)
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return (frame->frame);
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return (read_register (SP_REGNUM) - 4);
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}
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static CORE_ADDR
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ns32k_frame_locals_address (struct frame_info *frame)
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{
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return (frame->frame);
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}
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static void
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ns32k_get_saved_register (char *raw_buffer, int *optimized, CORE_ADDR *addrp,
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struct frame_info *frame, int regnum,
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enum lval_type *lval)
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{
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CORE_ADDR addr;
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if (!target_has_registers)
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error ("No registers.");
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/* Normal systems don't optimize out things with register numbers. */
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if (optimized != NULL)
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*optimized = 0;
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addr = find_saved_register (frame, regnum);
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if (addr != 0)
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{
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if (lval != NULL)
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*lval = lval_memory;
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if (regnum == SP_REGNUM)
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{
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if (raw_buffer != NULL)
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{
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/* Put it back in target format. */
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store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
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(LONGEST) addr);
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}
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if (addrp != NULL)
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*addrp = 0;
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return;
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}
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if (raw_buffer != NULL)
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target_read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
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}
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else
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{
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if (lval != NULL)
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*lval = lval_register;
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addr = REGISTER_BYTE (regnum);
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if (raw_buffer != NULL)
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read_register_gen (regnum, raw_buffer);
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}
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if (addrp != NULL)
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*addrp = addr;
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}
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/* Code to initialize the addresses of the saved registers of frame described
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by FRAME_INFO. This includes special registers such as pc and fp saved in
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special ways in the stack frame. sp is even more special: the address we
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return for it IS the sp for the next frame. */
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static void
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ns32k_frame_init_saved_regs (struct frame_info *frame)
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{
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int regmask, regnum;
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int localcount;
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CORE_ADDR enter_addr, next_addr;
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if (frame->saved_regs)
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return;
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frame_saved_regs_zalloc (frame);
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enter_addr = ns32k_get_enter_addr (frame->pc);
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if (enter_addr > 1)
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{
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regmask = read_memory_integer (enter_addr + 1, 1) & 0xff;
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localcount = ns32k_localcount (enter_addr);
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next_addr = frame->frame + localcount;
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for (regnum = 0; regnum < 8; regnum++)
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{
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if (regmask & (1 << regnum))
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frame->saved_regs[regnum] = next_addr -= 4;
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}
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frame->saved_regs[SP_REGNUM] = frame->frame + 4;
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frame->saved_regs[PC_REGNUM] = frame->frame + 4;
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frame->saved_regs[FP_REGNUM] = read_memory_integer (frame->frame, 4);
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}
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else if (enter_addr == 1)
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{
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CORE_ADDR sp = read_register (SP_REGNUM);
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frame->saved_regs[PC_REGNUM] = sp;
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frame->saved_regs[SP_REGNUM] = sp + 4;
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}
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}
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static void
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ns32k_push_dummy_frame (void)
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{
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CORE_ADDR sp = read_register (SP_REGNUM);
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int regnum;
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sp = push_word (sp, read_register (PC_REGNUM));
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sp = push_word (sp, read_register (FP_REGNUM));
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write_register (FP_REGNUM, sp);
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for (regnum = 0; regnum < 8; regnum++)
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sp = push_word (sp, read_register (regnum));
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write_register (SP_REGNUM, sp);
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}
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static void
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ns32k_pop_frame (void)
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{
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struct frame_info *frame = get_current_frame ();
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CORE_ADDR fp;
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int regnum;
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fp = frame->frame;
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FRAME_INIT_SAVED_REGS (frame);
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for (regnum = 0; regnum < 8; regnum++)
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if (frame->saved_regs[regnum])
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write_register (regnum,
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read_memory_integer (frame->saved_regs[regnum], 4));
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write_register (FP_REGNUM, read_memory_integer (fp, 4));
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write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
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write_register (SP_REGNUM, fp + 8);
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flush_cached_frames ();
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}
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/* The NS32000 call dummy sequence:
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enter 0xff,0 82 ff 00
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jsr @0x00010203 7f ae c0 01 02 03
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adjspd 0x69696969 7f a5 01 02 03 04
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bpt f2
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It is 16 bytes long. */
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static LONGEST ns32k_call_dummy_words[] =
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{
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0x7f00ff82,
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0x0201c0ae,
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0x01a57f03,
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0xf2040302
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};
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static int sizeof_ns32k_call_dummy_words = sizeof (ns32k_call_dummy_words);
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#define NS32K_CALL_DUMMY_ADDR 5
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#define NS32K_CALL_DUMMY_NARGS 11
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static void
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ns32k_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
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struct value **args, struct type *type, int gcc_p)
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{
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int flipped;
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flipped = fun | 0xc0000000;
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flip_bytes (&flipped, 4);
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store_unsigned_integer (dummy + NS32K_CALL_DUMMY_ADDR, 4, flipped);
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flipped = - nargs * 4;
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flip_bytes (&flipped, 4);
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store_unsigned_integer (dummy + NS32K_CALL_DUMMY_NARGS, 4, flipped);
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}
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static void
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ns32k_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
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{
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/* On this machine, this is a no-op (Encore Umax didn't use GCC). */
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}
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static void
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ns32k_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
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{
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memcpy (valbuf,
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regbuf + REGISTER_BYTE (TYPE_CODE (valtype) == TYPE_CODE_FLT ?
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FP0_REGNUM : 0), TYPE_LENGTH (valtype));
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}
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static void
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ns32k_store_return_value (struct type *valtype, char *valbuf)
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{
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write_register_bytes (TYPE_CODE (valtype) == TYPE_CODE_FLT ?
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FP0_REGNUM : 0, valbuf, TYPE_LENGTH (valtype));
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}
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static CORE_ADDR
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ns32k_extract_struct_value_address (char *regbuf)
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{
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return (extract_address (regbuf + REGISTER_BYTE (0), REGISTER_RAW_SIZE (0)));
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}
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void
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ns32k_gdbarch_init_32082 (struct gdbarch *gdbarch)
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{
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set_gdbarch_num_regs (gdbarch, NS32K_NUM_REGS_32082);
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set_gdbarch_register_name (gdbarch, ns32k_register_name_32082);
|
||
set_gdbarch_register_bytes (gdbarch, NS32K_REGISTER_BYTES_32082);
|
||
set_gdbarch_register_byte (gdbarch, ns32k_register_byte_32082);
|
||
}
|
||
|
||
void
|
||
ns32k_gdbarch_init_32382 (struct gdbarch *gdbarch)
|
||
{
|
||
set_gdbarch_num_regs (gdbarch, NS32K_NUM_REGS_32382);
|
||
|
||
set_gdbarch_register_name (gdbarch, ns32k_register_name_32382);
|
||
set_gdbarch_register_bytes (gdbarch, NS32K_REGISTER_BYTES_32382);
|
||
set_gdbarch_register_byte (gdbarch, ns32k_register_byte_32382);
|
||
}
|
||
|
||
/* Initialize the current architecture based on INFO. If possible, re-use an
|
||
architecture from ARCHES, which is a list of architectures already created
|
||
during this debugging session.
|
||
|
||
Called e.g. at program startup, when reading a core file, and when reading
|
||
a binary file. */
|
||
|
||
static struct gdbarch *
|
||
ns32k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
|
||
{
|
||
struct gdbarch_tdep *tdep;
|
||
struct gdbarch *gdbarch;
|
||
enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
|
||
|
||
/* Try to determine the OS ABI of the object we are loading. */
|
||
if (info.abfd != NULL)
|
||
{
|
||
osabi = gdbarch_lookup_osabi (info.abfd);
|
||
}
|
||
|
||
/* Find a candidate among extant architectures. */
|
||
for (arches = gdbarch_list_lookup_by_info (arches, &info);
|
||
arches != NULL;
|
||
arches = gdbarch_list_lookup_by_info (arches->next, &info))
|
||
{
|
||
/* Make sure the OS ABI selection matches. */
|
||
tdep = gdbarch_tdep (arches->gdbarch);
|
||
if (tdep && tdep->osabi == osabi)
|
||
return arches->gdbarch;
|
||
}
|
||
|
||
tdep = xmalloc (sizeof (struct gdbarch_tdep));
|
||
gdbarch = gdbarch_alloc (&info, tdep);
|
||
|
||
tdep->osabi = osabi;
|
||
|
||
/* Register info */
|
||
ns32k_gdbarch_init_32082 (gdbarch);
|
||
set_gdbarch_num_regs (gdbarch, NS32K_SP_REGNUM);
|
||
set_gdbarch_num_regs (gdbarch, NS32K_FP_REGNUM);
|
||
set_gdbarch_num_regs (gdbarch, NS32K_PC_REGNUM);
|
||
set_gdbarch_num_regs (gdbarch, NS32K_PS_REGNUM);
|
||
|
||
set_gdbarch_register_size (gdbarch, NS32K_REGISTER_SIZE);
|
||
set_gdbarch_register_raw_size (gdbarch, ns32k_register_raw_size);
|
||
set_gdbarch_max_register_raw_size (gdbarch, NS32K_MAX_REGISTER_RAW_SIZE);
|
||
set_gdbarch_register_virtual_size (gdbarch, ns32k_register_virtual_size);
|
||
set_gdbarch_max_register_virtual_size (gdbarch,
|
||
NS32K_MAX_REGISTER_VIRTUAL_SIZE);
|
||
set_gdbarch_register_virtual_type (gdbarch, ns32k_register_virtual_type);
|
||
|
||
/* Frame and stack info */
|
||
set_gdbarch_skip_prologue (gdbarch, umax_skip_prologue);
|
||
set_gdbarch_saved_pc_after_call (gdbarch, ns32k_saved_pc_after_call);
|
||
|
||
set_gdbarch_frame_num_args (gdbarch, umax_frame_num_args);
|
||
set_gdbarch_frameless_function_invocation (gdbarch,
|
||
generic_frameless_function_invocation_not);
|
||
|
||
set_gdbarch_frame_chain (gdbarch, ns32k_frame_chain);
|
||
set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid);
|
||
set_gdbarch_frame_saved_pc (gdbarch, ns32k_frame_saved_pc);
|
||
|
||
set_gdbarch_frame_args_address (gdbarch, ns32k_frame_args_address);
|
||
set_gdbarch_frame_locals_address (gdbarch, ns32k_frame_locals_address);
|
||
|
||
set_gdbarch_frame_init_saved_regs (gdbarch, ns32k_frame_init_saved_regs);
|
||
|
||
set_gdbarch_frame_args_skip (gdbarch, 8);
|
||
|
||
set_gdbarch_get_saved_register (gdbarch, ns32k_get_saved_register);
|
||
|
||
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
|
||
|
||
/* Return value info */
|
||
set_gdbarch_store_struct_return (gdbarch, ns32k_store_struct_return);
|
||
set_gdbarch_deprecated_extract_return_value (gdbarch, ns32k_extract_return_value);
|
||
set_gdbarch_store_return_value (gdbarch, ns32k_store_return_value);
|
||
set_gdbarch_deprecated_extract_struct_value_address (gdbarch,
|
||
ns32k_extract_struct_value_address);
|
||
|
||
/* Call dummy info */
|
||
set_gdbarch_push_dummy_frame (gdbarch, ns32k_push_dummy_frame);
|
||
set_gdbarch_pop_frame (gdbarch, ns32k_pop_frame);
|
||
set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
|
||
set_gdbarch_call_dummy_p (gdbarch, 1);
|
||
set_gdbarch_call_dummy_words (gdbarch, ns32k_call_dummy_words);
|
||
set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof_ns32k_call_dummy_words);
|
||
set_gdbarch_fix_call_dummy (gdbarch, ns32k_fix_call_dummy);
|
||
set_gdbarch_call_dummy_start_offset (gdbarch, 3);
|
||
set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 0);
|
||
set_gdbarch_use_generic_dummy_frames (gdbarch, 0);
|
||
set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack);
|
||
set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
|
||
|
||
/* Breakpoint info */
|
||
set_gdbarch_decr_pc_after_break (gdbarch, 0);
|
||
set_gdbarch_breakpoint_from_pc (gdbarch, ns32k_breakpoint_from_pc);
|
||
|
||
/* Misc info */
|
||
set_gdbarch_function_start_offset (gdbarch, 0);
|
||
|
||
/* Hook in OS ABI-specific overrides, if they have been registered. */
|
||
gdbarch_init_osabi (info, gdbarch, osabi);
|
||
|
||
return (gdbarch);
|
||
}
|
||
|
||
static void
|
||
ns32k_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
|
||
|
||
if (tdep == NULL)
|
||
return;
|
||
|
||
fprintf_unfiltered (file, "ns32k_dump_tdep: OS ABI = %s\n",
|
||
gdbarch_osabi_name (tdep->osabi));
|
||
}
|
||
|
||
void
|
||
_initialize_ns32k_tdep (void)
|
||
{
|
||
gdbarch_register (bfd_arch_ns32k, ns32k_gdbarch_init, ns32k_dump_tdep);
|
||
|
||
tm_print_insn = print_insn_ns32k;
|
||
}
|