900 lines
22 KiB
C
900 lines
22 KiB
C
/* Print mips instructions for GDB, the GNU debugger, or for objdump.
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Copyright 1989, 91, 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
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Contributed by Nobuyuki Hikichi(hikichi@sra.co.jp).
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This file is part of GDB, GAS, and the GNU binutils.
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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, Boston, MA 02111-1307, USA. */
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#include <ansidecl.h>
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#include "sysdep.h"
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#include "dis-asm.h"
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#include "opcode/mips.h"
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/* FIXME: These are needed to figure out if this is a mips16 symbol or
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not. It would be better to think of a cleaner way to do this. */
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#include "elf-bfd.h"
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#include "elf/mips.h"
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static int print_insn_mips16 PARAMS ((bfd_vma, struct disassemble_info *));
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static void print_mips16_insn_arg
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PARAMS ((int, const struct mips_opcode *, int, boolean, int, bfd_vma,
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struct disassemble_info *));
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/* Mips instructions are never longer than this many bytes. */
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#define MAXLEN 4
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static void print_insn_arg PARAMS ((const char *, unsigned long, bfd_vma,
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struct disassemble_info *));
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static int _print_insn_mips PARAMS ((bfd_vma, unsigned long int,
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struct disassemble_info *));
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/* FIXME: This should be shared with gdb somehow. */
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#define REGISTER_NAMES \
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{ "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3", \
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"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", \
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"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
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"t8", "t9", "k0", "k1", "gp", "sp", "s8", "ra", \
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"sr", "lo", "hi", "bad", "cause","pc", \
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"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
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"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
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"f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",\
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"f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",\
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"fsr", "fir", "fp", "inx", "rand", "tlblo","ctxt", "tlbhi",\
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"epc", "prid"\
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}
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static CONST char * CONST reg_names[] = REGISTER_NAMES;
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/* The mips16 register names. */
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static const char * const mips16_reg_names[] =
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{
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"s0", "s1", "v0", "v1", "a0", "a1", "a2", "a3"
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};
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/* subroutine */
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static void
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print_insn_arg (d, l, pc, info)
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const char *d;
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register unsigned long int l;
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bfd_vma pc;
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struct disassemble_info *info;
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{
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int delta;
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switch (*d)
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{
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case ',':
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case '(':
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case ')':
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(*info->fprintf_func) (info->stream, "%c", *d);
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break;
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case 's':
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case 'b':
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case 'r':
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case 'v':
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(*info->fprintf_func) (info->stream, "$%s",
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reg_names[(l >> OP_SH_RS) & OP_MASK_RS]);
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break;
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case 't':
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case 'w':
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(*info->fprintf_func) (info->stream, "$%s",
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reg_names[(l >> OP_SH_RT) & OP_MASK_RT]);
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break;
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case 'i':
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case 'u':
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(*info->fprintf_func) (info->stream, "0x%x",
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(l >> OP_SH_IMMEDIATE) & OP_MASK_IMMEDIATE);
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break;
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case 'j': /* same as i, but sign-extended */
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case 'o':
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delta = (l >> OP_SH_DELTA) & OP_MASK_DELTA;
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if (delta & 0x8000)
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delta |= ~0xffff;
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(*info->fprintf_func) (info->stream, "%d",
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delta);
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break;
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case 'h':
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(*info->fprintf_func) (info->stream, "0x%x",
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(unsigned int) ((l >> OP_SH_PREFX)
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& OP_MASK_PREFX));
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break;
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case 'k':
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(*info->fprintf_func) (info->stream, "0x%x",
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(unsigned int) ((l >> OP_SH_CACHE)
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& OP_MASK_CACHE));
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break;
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case 'a':
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(*info->print_address_func)
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(((pc & 0xF0000000) | (((l >> OP_SH_TARGET) & OP_MASK_TARGET) << 2)),
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info);
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break;
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case 'p':
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/* sign extend the displacement */
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delta = (l >> OP_SH_DELTA) & OP_MASK_DELTA;
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if (delta & 0x8000)
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delta |= ~0xffff;
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(*info->print_address_func)
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((delta << 2) + pc + 4,
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info);
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break;
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case 'd':
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(*info->fprintf_func) (info->stream, "$%s",
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reg_names[(l >> OP_SH_RD) & OP_MASK_RD]);
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break;
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case 'z':
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(*info->fprintf_func) (info->stream, "$%s", reg_names[0]);
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break;
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case '<':
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(*info->fprintf_func) (info->stream, "0x%x",
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(l >> OP_SH_SHAMT) & OP_MASK_SHAMT);
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break;
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case 'c':
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(*info->fprintf_func) (info->stream, "0x%x",
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(l >> OP_SH_CODE) & OP_MASK_CODE);
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break;
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case 'C':
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(*info->fprintf_func) (info->stream, "0x%x",
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(l >> OP_SH_COPZ) & OP_MASK_COPZ);
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break;
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case 'B':
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(*info->fprintf_func) (info->stream, "0x%x",
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(l >> OP_SH_SYSCALL) & OP_MASK_SYSCALL);
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break;
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case 'S':
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case 'V':
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(*info->fprintf_func) (info->stream, "$f%d",
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(l >> OP_SH_FS) & OP_MASK_FS);
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break;
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case 'T':
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case 'W':
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(*info->fprintf_func) (info->stream, "$f%d",
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(l >> OP_SH_FT) & OP_MASK_FT);
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break;
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case 'D':
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(*info->fprintf_func) (info->stream, "$f%d",
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(l >> OP_SH_FD) & OP_MASK_FD);
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break;
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case 'R':
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(*info->fprintf_func) (info->stream, "$f%d",
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(l >> OP_SH_FR) & OP_MASK_FR);
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break;
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case 'E':
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(*info->fprintf_func) (info->stream, "$%d",
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(l >> OP_SH_RT) & OP_MASK_RT);
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break;
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case 'G':
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(*info->fprintf_func) (info->stream, "$%d",
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(l >> OP_SH_RD) & OP_MASK_RD);
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break;
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case 'N':
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(*info->fprintf_func) (info->stream, "$fcc%d",
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(l >> OP_SH_BCC) & OP_MASK_BCC);
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break;
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case 'M':
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(*info->fprintf_func) (info->stream, "$fcc%d",
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(l >> OP_SH_CCC) & OP_MASK_CCC);
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break;
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default:
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(*info->fprintf_func) (info->stream,
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"# internal error, undefined modifier(%c)", *d);
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break;
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}
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}
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/* Print the mips instruction at address MEMADDR in debugged memory,
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on using INFO. Returns length of the instruction, in bytes, which is
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always 4. BIGENDIAN must be 1 if this is big-endian code, 0 if
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this is little-endian code. */
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static int
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_print_insn_mips (memaddr, word, info)
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bfd_vma memaddr;
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unsigned long int word;
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struct disassemble_info *info;
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{
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register const struct mips_opcode *op;
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static boolean init = 0;
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static const struct mips_opcode *mips_hash[OP_MASK_OP + 1];
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/* Build a hash table to shorten the search time. */
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if (! init)
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{
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unsigned int i;
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for (i = 0; i <= OP_MASK_OP; i++)
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{
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for (op = mips_opcodes; op < &mips_opcodes[NUMOPCODES]; op++)
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{
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if (op->pinfo == INSN_MACRO)
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continue;
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if (i == ((op->match >> OP_SH_OP) & OP_MASK_OP))
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{
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mips_hash[i] = op;
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break;
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}
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}
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}
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init = 1;
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}
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info->bytes_per_chunk = 4;
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info->display_endian = info->endian;
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op = mips_hash[(word >> OP_SH_OP) & OP_MASK_OP];
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if (op != NULL)
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{
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for (; op < &mips_opcodes[NUMOPCODES]; op++)
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{
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if (op->pinfo != INSN_MACRO && (word & op->mask) == op->match)
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{
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register const char *d;
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(*info->fprintf_func) (info->stream, "%s", op->name);
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d = op->args;
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if (d != NULL && *d != '\0')
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{
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(*info->fprintf_func) (info->stream, "\t");
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for (; *d != '\0'; d++)
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print_insn_arg (d, word, memaddr, info);
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}
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return 4;
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}
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}
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}
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/* Handle undefined instructions. */
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(*info->fprintf_func) (info->stream, "0x%x", word);
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return 4;
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}
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int
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print_insn_big_mips (memaddr, info)
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bfd_vma memaddr;
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struct disassemble_info *info;
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{
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bfd_byte buffer[4];
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int status;
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if (info->mach == 16
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|| (info->flavour == bfd_target_elf_flavour
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&& info->symbol != NULL
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&& (((elf_symbol_type *) info->symbol)->internal_elf_sym.st_other
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== STO_MIPS16)))
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return print_insn_mips16 (memaddr, info);
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status = (*info->read_memory_func) (memaddr, buffer, 4, info);
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if (status == 0)
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return _print_insn_mips (memaddr, (unsigned long) bfd_getb32 (buffer),
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info);
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else
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{
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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}
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int
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print_insn_little_mips (memaddr, info)
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bfd_vma memaddr;
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struct disassemble_info *info;
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{
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bfd_byte buffer[4];
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int status;
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if (info->mach == 16
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|| (info->flavour == bfd_target_elf_flavour
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&& info->symbol != NULL
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&& (((elf_symbol_type *) info->symbol)->internal_elf_sym.st_other
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== STO_MIPS16)))
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return print_insn_mips16 (memaddr, info);
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status = (*info->read_memory_func) (memaddr, buffer, 4, info);
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if (status == 0)
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return _print_insn_mips (memaddr, (unsigned long) bfd_getl32 (buffer),
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info);
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else
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{
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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}
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/* Disassemble mips16 instructions. */
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static int
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print_insn_mips16 (memaddr, info)
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bfd_vma memaddr;
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struct disassemble_info *info;
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{
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int status;
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bfd_byte buffer[2];
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int length;
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int insn;
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boolean use_extend;
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int extend;
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const struct mips_opcode *op, *opend;
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info->bytes_per_chunk = 2;
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info->display_endian = info->endian;
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info->insn_info_valid = 1;
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info->branch_delay_insns = 0;
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info->data_size = 0;
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info->insn_type = dis_nonbranch;
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info->target = 0;
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info->target2 = 0;
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status = (*info->read_memory_func) (memaddr, buffer, 2, info);
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if (status != 0)
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{
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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length = 2;
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if (info->endian == BFD_ENDIAN_BIG)
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insn = bfd_getb16 (buffer);
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else
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insn = bfd_getl16 (buffer);
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/* Handle the extend opcode specially. */
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use_extend = false;
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if ((insn & 0xf800) == 0xf000)
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{
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use_extend = true;
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extend = insn & 0x7ff;
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memaddr += 2;
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status = (*info->read_memory_func) (memaddr, buffer, 2, info);
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if (status != 0)
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{
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(*info->fprintf_func) (info->stream, "extend 0x%x",
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(unsigned int) extend);
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(*info->memory_error_func) (status, memaddr, info);
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return -1;
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}
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if (info->endian == BFD_ENDIAN_BIG)
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insn = bfd_getb16 (buffer);
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else
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insn = bfd_getl16 (buffer);
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/* Check for an extend opcode followed by an extend opcode. */
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if ((insn & 0xf800) == 0xf000)
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{
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(*info->fprintf_func) (info->stream, "extend 0x%x",
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(unsigned int) extend);
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info->insn_type = dis_noninsn;
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return length;
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}
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length += 2;
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}
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/* FIXME: Should probably use a hash table on the major opcode here. */
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opend = mips16_opcodes + bfd_mips16_num_opcodes;
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for (op = mips16_opcodes; op < opend; op++)
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{
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if (op->pinfo != INSN_MACRO && (insn & op->mask) == op->match)
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{
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const char *s;
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if (strchr (op->args, 'a') != NULL)
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{
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if (use_extend)
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{
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(*info->fprintf_func) (info->stream, "extend 0x%x",
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(unsigned int) extend);
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info->insn_type = dis_noninsn;
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return length - 2;
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}
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use_extend = false;
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memaddr += 2;
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status = (*info->read_memory_func) (memaddr, buffer, 2,
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info);
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if (status == 0)
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{
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use_extend = true;
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if (info->endian == BFD_ENDIAN_BIG)
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extend = bfd_getb16 (buffer);
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else
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extend = bfd_getl16 (buffer);
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length += 2;
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}
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}
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(*info->fprintf_func) (info->stream, "%s", op->name);
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if (op->args[0] != '\0')
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(*info->fprintf_func) (info->stream, "\t");
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for (s = op->args; *s != '\0'; s++)
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{
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if (*s == ','
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&& s[1] == 'w'
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&& (((insn >> MIPS16OP_SH_RX) & MIPS16OP_MASK_RX)
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== ((insn >> MIPS16OP_SH_RY) & MIPS16OP_MASK_RY)))
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{
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/* Skip the register and the comma. */
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++s;
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continue;
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}
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if (*s == ','
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&& s[1] == 'v'
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&& (((insn >> MIPS16OP_SH_RZ) & MIPS16OP_MASK_RZ)
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== ((insn >> MIPS16OP_SH_RX) & MIPS16OP_MASK_RX)))
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{
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/* Skip the register and the comma. */
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++s;
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continue;
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}
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print_mips16_insn_arg (*s, op, insn, use_extend, extend, memaddr,
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info);
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}
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if ((op->pinfo & INSN_UNCOND_BRANCH_DELAY) != 0)
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{
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info->branch_delay_insns = 1;
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if (info->insn_type != dis_jsr)
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info->insn_type = dis_branch;
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}
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return length;
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}
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}
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if (use_extend)
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(*info->fprintf_func) (info->stream, "0x%x", extend | 0xf000);
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(*info->fprintf_func) (info->stream, "0x%x", insn);
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info->insn_type = dis_noninsn;
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return length;
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}
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/* Disassemble an operand for a mips16 instruction. */
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static void
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print_mips16_insn_arg (type, op, l, use_extend, extend, memaddr, info)
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int type;
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const struct mips_opcode *op;
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int l;
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boolean use_extend;
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int extend;
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bfd_vma memaddr;
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struct disassemble_info *info;
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{
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switch (type)
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{
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case ',':
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case '(':
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case ')':
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(*info->fprintf_func) (info->stream, "%c", type);
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break;
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case 'y':
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case 'w':
|
||
(*info->fprintf_func) (info->stream, "$%s",
|
||
mips16_reg_names[((l >> MIPS16OP_SH_RY)
|
||
& MIPS16OP_MASK_RY)]);
|
||
break;
|
||
|
||
case 'x':
|
||
case 'v':
|
||
(*info->fprintf_func) (info->stream, "$%s",
|
||
mips16_reg_names[((l >> MIPS16OP_SH_RX)
|
||
& MIPS16OP_MASK_RX)]);
|
||
break;
|
||
|
||
case 'z':
|
||
(*info->fprintf_func) (info->stream, "$%s",
|
||
mips16_reg_names[((l >> MIPS16OP_SH_RZ)
|
||
& MIPS16OP_MASK_RZ)]);
|
||
break;
|
||
|
||
case 'Z':
|
||
(*info->fprintf_func) (info->stream, "$%s",
|
||
mips16_reg_names[((l >> MIPS16OP_SH_MOVE32Z)
|
||
& MIPS16OP_MASK_MOVE32Z)]);
|
||
break;
|
||
|
||
case '0':
|
||
(*info->fprintf_func) (info->stream, "$%s", reg_names[0]);
|
||
break;
|
||
|
||
case 'S':
|
||
(*info->fprintf_func) (info->stream, "$%s", reg_names[29]);
|
||
break;
|
||
|
||
case 'P':
|
||
(*info->fprintf_func) (info->stream, "$pc");
|
||
break;
|
||
|
||
case 'R':
|
||
(*info->fprintf_func) (info->stream, "$%s", reg_names[31]);
|
||
break;
|
||
|
||
case 'X':
|
||
(*info->fprintf_func) (info->stream, "$%s",
|
||
reg_names[((l >> MIPS16OP_SH_REGR32)
|
||
& MIPS16OP_MASK_REGR32)]);
|
||
break;
|
||
|
||
case 'Y':
|
||
(*info->fprintf_func) (info->stream, "$%s",
|
||
reg_names[MIPS16OP_EXTRACT_REG32R (l)]);
|
||
break;
|
||
|
||
case '<':
|
||
case '>':
|
||
case '[':
|
||
case ']':
|
||
case '4':
|
||
case '5':
|
||
case 'H':
|
||
case 'W':
|
||
case 'D':
|
||
case 'j':
|
||
case '6':
|
||
case '8':
|
||
case 'V':
|
||
case 'C':
|
||
case 'U':
|
||
case 'k':
|
||
case 'K':
|
||
case 'p':
|
||
case 'q':
|
||
case 'A':
|
||
case 'B':
|
||
case 'E':
|
||
{
|
||
int immed, nbits, shift, signedp, extbits, pcrel, extu, branch;
|
||
|
||
shift = 0;
|
||
signedp = 0;
|
||
extbits = 16;
|
||
pcrel = 0;
|
||
extu = 0;
|
||
branch = 0;
|
||
switch (type)
|
||
{
|
||
case '<':
|
||
nbits = 3;
|
||
immed = (l >> MIPS16OP_SH_RZ) & MIPS16OP_MASK_RZ;
|
||
extbits = 5;
|
||
extu = 1;
|
||
break;
|
||
case '>':
|
||
nbits = 3;
|
||
immed = (l >> MIPS16OP_SH_RX) & MIPS16OP_MASK_RX;
|
||
extbits = 5;
|
||
extu = 1;
|
||
break;
|
||
case '[':
|
||
nbits = 3;
|
||
immed = (l >> MIPS16OP_SH_RZ) & MIPS16OP_MASK_RZ;
|
||
extbits = 6;
|
||
extu = 1;
|
||
break;
|
||
case ']':
|
||
nbits = 3;
|
||
immed = (l >> MIPS16OP_SH_RX) & MIPS16OP_MASK_RX;
|
||
extbits = 6;
|
||
extu = 1;
|
||
break;
|
||
case '4':
|
||
nbits = 4;
|
||
immed = (l >> MIPS16OP_SH_IMM4) & MIPS16OP_MASK_IMM4;
|
||
signedp = 1;
|
||
extbits = 15;
|
||
break;
|
||
case '5':
|
||
nbits = 5;
|
||
immed = (l >> MIPS16OP_SH_IMM5) & MIPS16OP_MASK_IMM5;
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 1;
|
||
break;
|
||
case 'H':
|
||
nbits = 5;
|
||
shift = 1;
|
||
immed = (l >> MIPS16OP_SH_IMM5) & MIPS16OP_MASK_IMM5;
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 2;
|
||
break;
|
||
case 'W':
|
||
nbits = 5;
|
||
shift = 2;
|
||
immed = (l >> MIPS16OP_SH_IMM5) & MIPS16OP_MASK_IMM5;
|
||
if ((op->pinfo & MIPS16_INSN_READ_PC) == 0
|
||
&& (op->pinfo & MIPS16_INSN_READ_SP) == 0)
|
||
{
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 4;
|
||
}
|
||
break;
|
||
case 'D':
|
||
nbits = 5;
|
||
shift = 3;
|
||
immed = (l >> MIPS16OP_SH_IMM5) & MIPS16OP_MASK_IMM5;
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 8;
|
||
break;
|
||
case 'j':
|
||
nbits = 5;
|
||
immed = (l >> MIPS16OP_SH_IMM5) & MIPS16OP_MASK_IMM5;
|
||
signedp = 1;
|
||
break;
|
||
case '6':
|
||
nbits = 6;
|
||
immed = (l >> MIPS16OP_SH_IMM6) & MIPS16OP_MASK_IMM6;
|
||
break;
|
||
case '8':
|
||
nbits = 8;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
break;
|
||
case 'V':
|
||
nbits = 8;
|
||
shift = 2;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
/* FIXME: This might be lw, or it might be addiu to $sp or
|
||
$pc. We assume it's load. */
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 4;
|
||
break;
|
||
case 'C':
|
||
nbits = 8;
|
||
shift = 3;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 8;
|
||
break;
|
||
case 'U':
|
||
nbits = 8;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
extu = 1;
|
||
break;
|
||
case 'k':
|
||
nbits = 8;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
signedp = 1;
|
||
break;
|
||
case 'K':
|
||
nbits = 8;
|
||
shift = 3;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
signedp = 1;
|
||
break;
|
||
case 'p':
|
||
nbits = 8;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
signedp = 1;
|
||
pcrel = 1;
|
||
branch = 1;
|
||
info->insn_type = dis_condbranch;
|
||
break;
|
||
case 'q':
|
||
nbits = 11;
|
||
immed = (l >> MIPS16OP_SH_IMM11) & MIPS16OP_MASK_IMM11;
|
||
signedp = 1;
|
||
pcrel = 1;
|
||
branch = 1;
|
||
info->insn_type = dis_branch;
|
||
break;
|
||
case 'A':
|
||
nbits = 8;
|
||
shift = 2;
|
||
immed = (l >> MIPS16OP_SH_IMM8) & MIPS16OP_MASK_IMM8;
|
||
pcrel = 1;
|
||
/* FIXME: This can be lw or la. We assume it is lw. */
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 4;
|
||
break;
|
||
case 'B':
|
||
nbits = 5;
|
||
shift = 3;
|
||
immed = (l >> MIPS16OP_SH_IMM5) & MIPS16OP_MASK_IMM5;
|
||
pcrel = 1;
|
||
info->insn_type = dis_dref;
|
||
info->data_size = 8;
|
||
break;
|
||
case 'E':
|
||
nbits = 5;
|
||
shift = 2;
|
||
immed = (l >> MIPS16OP_SH_IMM5) & MIPS16OP_MASK_IMM5;
|
||
pcrel = 1;
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
if (! use_extend)
|
||
{
|
||
if (signedp && immed >= (1 << (nbits - 1)))
|
||
immed -= 1 << nbits;
|
||
immed <<= shift;
|
||
if ((type == '<' || type == '>' || type == '[' || type == '[')
|
||
&& immed == 0)
|
||
immed = 8;
|
||
}
|
||
else
|
||
{
|
||
if (extbits == 16)
|
||
immed |= ((extend & 0x1f) << 11) | (extend & 0x7e0);
|
||
else if (extbits == 15)
|
||
immed |= ((extend & 0xf) << 11) | (extend & 0x7f0);
|
||
else
|
||
immed = ((extend >> 6) & 0x1f) | (extend & 0x20);
|
||
immed &= (1 << extbits) - 1;
|
||
if (! extu && immed >= (1 << (extbits - 1)))
|
||
immed -= 1 << extbits;
|
||
}
|
||
|
||
if (! pcrel)
|
||
(*info->fprintf_func) (info->stream, "%d", immed);
|
||
else
|
||
{
|
||
bfd_vma baseaddr;
|
||
bfd_vma val;
|
||
|
||
if (branch)
|
||
{
|
||
immed *= 2;
|
||
baseaddr = memaddr + 2;
|
||
}
|
||
else if (use_extend)
|
||
baseaddr = memaddr;
|
||
else
|
||
{
|
||
int status;
|
||
bfd_byte buffer[2];
|
||
|
||
baseaddr = memaddr;
|
||
|
||
/* If this instruction is in the delay slot of a jr
|
||
instruction, the base address is the address of the
|
||
jr instruction. If it is in the delay slot of jalr
|
||
instruction, the base address is the address of the
|
||
jalr instruction. This test is unreliable: we have
|
||
no way of knowing whether the previous word is
|
||
instruction or data. */
|
||
status = (*info->read_memory_func) (memaddr - 4, buffer, 2,
|
||
info);
|
||
if (status == 0
|
||
&& (((info->endian == BFD_ENDIAN_BIG
|
||
? bfd_getb16 (buffer)
|
||
: bfd_getl16 (buffer))
|
||
& 0xf800) == 0x1800))
|
||
baseaddr = memaddr - 4;
|
||
else
|
||
{
|
||
status = (*info->read_memory_func) (memaddr - 2, buffer,
|
||
2, info);
|
||
if (status == 0
|
||
&& (((info->endian == BFD_ENDIAN_BIG
|
||
? bfd_getb16 (buffer)
|
||
: bfd_getl16 (buffer))
|
||
& 0xf81f) == 0xe800))
|
||
baseaddr = memaddr - 2;
|
||
}
|
||
}
|
||
val = (baseaddr & ~ ((1 << shift) - 1)) + immed;
|
||
(*info->print_address_func) (val, info);
|
||
info->target = val;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case 'a':
|
||
if (! use_extend)
|
||
extend = 0;
|
||
l = ((l & 0x1f) << 23) | ((l & 0x3e0) << 13) | (extend << 2);
|
||
(*info->print_address_func) ((memaddr & 0xf0000000) | l, info);
|
||
info->insn_type = dis_jsr;
|
||
info->target = (memaddr & 0xf0000000) | l;
|
||
info->branch_delay_insns = 1;
|
||
break;
|
||
|
||
case 'l':
|
||
case 'L':
|
||
{
|
||
int need_comma, amask, smask;
|
||
|
||
need_comma = 0;
|
||
|
||
l = (l >> MIPS16OP_SH_IMM6) & MIPS16OP_MASK_IMM6;
|
||
|
||
amask = (l >> 3) & 7;
|
||
|
||
if (amask > 0 && amask < 5)
|
||
{
|
||
(*info->fprintf_func) (info->stream, "$%s", reg_names[4]);
|
||
if (amask > 1)
|
||
(*info->fprintf_func) (info->stream, "-$%s",
|
||
reg_names[amask + 3]);
|
||
need_comma = 1;
|
||
}
|
||
|
||
smask = (l >> 1) & 3;
|
||
if (smask == 3)
|
||
{
|
||
(*info->fprintf_func) (info->stream, "%s??",
|
||
need_comma ? "," : "");
|
||
need_comma = 1;
|
||
}
|
||
else if (smask > 0)
|
||
{
|
||
(*info->fprintf_func) (info->stream, "%s$%s",
|
||
need_comma ? "," : "",
|
||
reg_names[16]);
|
||
if (smask > 1)
|
||
(*info->fprintf_func) (info->stream, "-$%s",
|
||
reg_names[smask + 15]);
|
||
need_comma = 1;
|
||
}
|
||
|
||
if (l & 1)
|
||
{
|
||
(*info->fprintf_func) (info->stream, "%s$%s",
|
||
need_comma ? "," : "",
|
||
reg_names[31]);
|
||
need_comma = 1;
|
||
}
|
||
|
||
if (amask == 5 || amask == 6)
|
||
{
|
||
(*info->fprintf_func) (info->stream, "%s$f0",
|
||
need_comma ? "," : "");
|
||
if (amask == 6)
|
||
(*info->fprintf_func) (info->stream, "-$f1");
|
||
}
|
||
}
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|