diff options
Diffstat (limited to 'opcodes/i370-dis.c')
| -rw-r--r-- | opcodes/i370-dis.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/opcodes/i370-dis.c b/opcodes/i370-dis.c new file mode 100644 index 0000000..a992c76 --- /dev/null +++ b/opcodes/i370-dis.c @@ -0,0 +1,167 @@ + +/* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions + Copyright 1994, 2000 Free Software Foundation, Inc. + PowerPC version written by Ian Lance Taylor, Cygnus Support + Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org> + +This file is part of GDB, GAS, and the GNU binutils. + +GDB, GAS, and the GNU binutils are free software; you can redistribute +them and/or modify them under the terms of the GNU General Public +License as published by the Free Software Foundation; either version +2, or (at your option) any later version. + +GDB, GAS, and the GNU binutils are distributed in the hope that they +will be useful, but WITHOUT ANY WARRANTY; without even the implied +warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See +the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this file; see the file COPYING. If not, write to the Free +Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include <stdio.h> +#include "ansidecl.h" +#include "sysdep.h" +#include "dis-asm.h" +#include "opcode/i370.h" + +/* This file provides several disassembler functions, all of which use + the disassembler interface defined in dis-asm.h. +*/ + +int +print_insn_i370 (memaddr, info) + bfd_vma memaddr; + struct disassemble_info *info; +{ + bfd_byte buffer[8]; + int status; + i370_insn_t insn; + const struct i370_opcode *opcode; + const struct i370_opcode *opcode_end; + + status = (*info->read_memory_func) (memaddr, buffer, 6, info); + if (status != 0) + { + (*info->memory_error_func) (status, memaddr, info); + return -1; + } + + /* Cast the bytes into the insn (in a host-endian indep way) */ + insn.i[0] = (buffer[0] << 24) & 0xff000000; + insn.i[0] |= (buffer[1] << 16) & 0xff0000; + insn.i[0] |= (buffer[2] << 8) & 0xff00; + insn.i[0] |= buffer[3] & 0xff; + insn.i[1] = (buffer[4] << 24) & 0xff000000; + insn.i[1] |= (buffer[5] << 16) & 0xff0000; + + /* Find the first match in the opcode table. We could speed this up + a bit by doing a binary search on the major opcode. */ + opcode_end = i370_opcodes + i370_num_opcodes; + for (opcode = i370_opcodes; opcode < opcode_end; opcode++) + { + const unsigned char *opindex; + const struct i370_operand *operand; + i370_insn_t masked; + int invalid; + + /* Mask off operands, and look for a match ... */ + masked = insn; + if (2 == opcode->len) + { + masked.i[0] >>= 16; + masked.i[0] &= 0xffff; + } + masked.i[0] &= opcode->mask.i[0]; + if (masked.i[0] != opcode->opcode.i[0]) continue; + + if (6 == opcode->len) + { + masked.i[1] &= opcode->mask.i[1]; + if (masked.i[1] != opcode->opcode.i[1]) continue; + } + + /* Found a match. adjust a tad */ + if (2 == opcode->len) + { + insn.i[0] >>= 16; + insn.i[0] &= 0xffff; + } + + /* Make two passes over the operands. First see if any of them + have extraction functions, and, if they do, make sure the + instruction is valid. */ + invalid = 0; + for (opindex = opcode->operands; *opindex != 0; opindex++) + { + operand = i370_operands + *opindex; + if (operand->extract) + (*operand->extract) (insn, &invalid); + } + if (invalid) continue; + + /* The instruction is valid. */ + (*info->fprintf_func) (info->stream, "%s", opcode->name); + if (opcode->operands[0] != 0) + (*info->fprintf_func) (info->stream, "\t"); + + /* Now extract and print the operands. */ + for (opindex = opcode->operands; *opindex != 0; opindex++) + { + long value; + + operand = i370_operands + *opindex; + + /* Extract the value from the instruction. */ + if (operand->extract) + value = (*operand->extract) (insn, (int *) NULL); + else + { + value = (insn.i[0] >> operand->shift) & ((1 << operand->bits) - 1); + } + + /* Print the operand as directed by the flags. */ + if ((operand->flags & I370_OPERAND_OPTIONAL) != 0) + { + if (value) + (*info->fprintf_func) (info->stream, "(r%ld)", value); + } + else if ((operand->flags & I370_OPERAND_SBASE) != 0) + { + (*info->fprintf_func) (info->stream, "(r%ld)", value); + } + else if ((operand->flags & I370_OPERAND_INDEX) != 0) + { + if (value) + (*info->fprintf_func) (info->stream, "(r%ld,", value); + else + (*info->fprintf_func) (info->stream, "(,"); + } + else if ((operand->flags & I370_OPERAND_LENGTH) != 0) + { + (*info->fprintf_func) (info->stream, "(%ld,", value); + } + else if ((operand->flags & I370_OPERAND_BASE) != 0) + (*info->fprintf_func) (info->stream, "r%ld)", value); + else if ((operand->flags & I370_OPERAND_GPR) != 0) + (*info->fprintf_func) (info->stream, "r%ld,", value); + else if ((operand->flags & I370_OPERAND_FPR) != 0) + (*info->fprintf_func) (info->stream, "f%ld,", value); + else if ((operand->flags & I370_OPERAND_RELATIVE) != 0) + (*info->fprintf_func) (info->stream, "%ld", value); + else + (*info->fprintf_func) (info->stream, " %ld, ", value); + + } + + return opcode->len; + + } + + + /* We could not find a match. */ + (*info->fprintf_func) (info->stream, ".short 0x%02x%02x", buffer[0], buffer[1]); + + return 2; +} |