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245 lines
6.5 KiB
C
245 lines
6.5 KiB
C
/* Print NS 32000 instructions for GDB, the GNU debugger.
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Copyright 1986, 1988, 1991, 1992, 1994, 1995, 1998, 1999, 2000, 2001
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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 "gdbcore.h"
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static int sign_extend (int value, int bits);
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void
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_initialize_ns32k_tdep (void)
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{
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tm_print_insn = print_insn_ns32k;
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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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/* OBSOLETE CORE_ADDR */
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/* OBSOLETE merlin_skip_prologue (CORE_ADDR pc) */
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/* OBSOLETE { */
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/* OBSOLETE register int op = read_memory_integer (pc, 1); */
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/* OBSOLETE if (op == 0x82) */
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/* OBSOLETE { */
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/* OBSOLETE op = read_memory_integer (pc + 2, 1); */
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/* OBSOLETE if ((op & 0x80) == 0) */
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/* OBSOLETE pc += 3; */
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/* OBSOLETE else if ((op & 0xc0) == 0x80) */
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/* OBSOLETE pc += 4; */
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/* OBSOLETE else */
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/* OBSOLETE pc += 6; */
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/* OBSOLETE } */
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/* OBSOLETE return pc; */
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/* OBSOLETE } */
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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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/* Return number of args passed to a frame.
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Can return -1, meaning no way to tell. */
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/* OBSOLETE int */
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/* OBSOLETE merlin_frame_num_args (struct frame_info *fi) */
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/* OBSOLETE { */
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/* OBSOLETE int numargs; */
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/* OBSOLETE CORE_ADDR pc; */
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/* OBSOLETE int insn; */
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/* OBSOLETE int addr_mode; */
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/* OBSOLETE int width; */
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/* OBSOLETE */
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/* OBSOLETE pc = FRAME_SAVED_PC (fi); */
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/* OBSOLETE insn = read_memory_integer (pc, 2); */
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/* OBSOLETE addr_mode = (insn >> 11) & 0x1f; */
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/* OBSOLETE insn = insn & 0x7ff; */
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/* OBSOLETE if ((insn & 0x7fc) == 0x57c */
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/* OBSOLETE && addr_mode == 0x14) *//* immediate */
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/* OBSOLETE { */
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/* OBSOLETE if (insn == 0x57c) *//* adjspb */
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/* OBSOLETE width = 1; */
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/* OBSOLETE else if (insn == 0x57d) *//* adjspw */
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/* OBSOLETE width = 2; */
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/* OBSOLETE else if (insn == 0x57f) *//* adjspd */
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/* OBSOLETE width = 4; */
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/* OBSOLETE else */
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/* OBSOLETE internal_error (__FILE__, __LINE__, "bad else"); */
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/* OBSOLETE numargs = read_memory_integer (pc + 2, width); */
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/* OBSOLETE if (width > 1) */
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/* OBSOLETE flip_bytes (&numargs, width); */
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/* OBSOLETE numargs = -sign_extend (numargs, width * 8) / 4; */
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/* OBSOLETE } */
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/* OBSOLETE else */
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/* OBSOLETE numargs = -1; */
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/* OBSOLETE return numargs; */
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/* OBSOLETE } */
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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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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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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 pc
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pointing to the enter instruction. This is used in the macro
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FRAME_FIND_SAVED_REGS. */
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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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/*
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* Get the address of the enter opcode for the function
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* containing PC, if there is an enter for the function,
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* and if the pc is between the enter and exit.
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* Returns positive address if pc is between enter/exit,
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* 1 if pc before enter or after exit, 0 otherwise.
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*/
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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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