From e7285169f8f215f1ebf4f1f2ae83901e5aaa4c81 Mon Sep 17 00:00:00 2001 From: Ian Lance Taylor Date: Sat, 5 Feb 1994 04:45:24 +0000 Subject: [PATCH] * ppc-dis.c (print_insn_powerpc): Don't skip optional operands if PPC_OPERAND_NEXT is set. --- opcodes/ppc-dis.c | 234 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 234 insertions(+) create mode 100644 opcodes/ppc-dis.c diff --git a/opcodes/ppc-dis.c b/opcodes/ppc-dis.c new file mode 100644 index 00000000000..19b16ef01e0 --- /dev/null +++ b/opcodes/ppc-dis.c @@ -0,0 +1,234 @@ +/* ppc-dis.c -- Disassemble PowerPC instructions + Copyright 1994 Free Software Foundation, Inc. + Written by Ian Lance Taylor, Cygnus Support + +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, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include +#include "ansidecl.h" +#include "sysdep.h" +#include "dis-asm.h" +#include "opcode/ppc.h" + +/* This file provides several disassembler functions, all of which use + the disassembler interface defined in dis-asm.h. Several functions + are provided because this file handles disassembly for the PowerPC + in both big and little endian mode and also for the POWER (RS/6000) + chip. */ + +static int print_insn_powerpc PARAMS ((bfd_vma, struct disassemble_info *, + int bigendian, int dialect)); + +/* Print a big endian PowerPC instruction. */ + +int +print_insn_big_powerpc (memaddr, info) + bfd_vma memaddr; + struct disassemble_info *info; +{ + return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_PPC); +} + +/* Print a little endian PowerPC instruction. */ + +int +print_insn_little_powerpc (memaddr, info) + bfd_vma memaddr; + struct disassemble_info *info; +{ + return print_insn_powerpc (memaddr, info, 0, PPC_OPCODE_PPC); +} + +/* Print a POWER (RS/6000) instruction. */ + +int +print_insn_rs6000 (memaddr, info) + bfd_vma memaddr; + struct disassemble_info *info; +{ + return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER); +} + +/* Print a PowerPC or POWER instruction. */ + +static int +print_insn_powerpc (memaddr, info, bigendian, dialect) + bfd_vma memaddr; + struct disassemble_info *info; + int bigendian; + int dialect; +{ + bfd_byte buffer[4]; + int status; + unsigned long insn; + const struct powerpc_opcode *opcode; + const struct powerpc_opcode *opcode_end; + unsigned long op; + + status = (*info->read_memory_func) (memaddr, buffer, 4, info); + if (status != 0) + { + (*info->memory_error_func) (status, memaddr, info); + return -1; + } + + if (bigendian) + insn = bfd_getb32 (buffer); + else + insn = bfd_getl32 (buffer); + + /* Get the major opcode of the instruction. */ + op = PPC_OP (insn); + + /* 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 = powerpc_opcodes + powerpc_num_opcodes; + for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++) + { + unsigned long table_op; + const unsigned char *opindex; + const struct powerpc_operand *operand; + int invalid; + int need_comma; + int need_paren; + + table_op = PPC_OP (opcode->opcode); + if (op < table_op) + break; + if (op > table_op) + continue; + + if ((insn & opcode->mask) != opcode->opcode + || (opcode->flags & dialect) == 0) + continue; + + /* 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 = powerpc_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. */ + need_comma = 0; + need_paren = 0; + for (opindex = opcode->operands; *opindex != 0; opindex++) + { + long value; + + operand = powerpc_operands + *opindex; + + /* Operands that are marked FAKE are simply ignored. We + already made sure that the extract function considered + the instruction to be valid. */ + if ((operand->flags & PPC_OPERAND_FAKE) != 0) + continue; + + /* Extract the value from the instruction. */ + if (operand->extract) + value = (*operand->extract) (insn, (int *) NULL); + else + { + value = (insn >> operand->shift) & ((1 << operand->bits) - 1); + if (operand->signedp + && (value & (1 << (operand->bits - 1))) != 0) + value -= 1 << operand->bits; + } + + /* If the operand is optional, and the value is zero, don't + print anything. */ + if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0 + && (operand->flags & PPC_OPERAND_NEXT) == 0 + && value == 0) + continue; + + if (need_comma) + { + (*info->fprintf_func) (info->stream, ","); + need_comma = 0; + } + + /* Print the operand as directed by the flags. */ + if ((operand->flags & PPC_OPERAND_GPR) != 0) + (*info->fprintf_func) (info->stream, "r%ld", value); + else if ((operand->flags & PPC_OPERAND_FPR) != 0) + (*info->fprintf_func) (info->stream, "f%ld", value); + else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0) + (*info->print_address_func) (memaddr + value, info); + else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0) + (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info); + else if ((operand->flags & PPC_OPERAND_CR) == 0 + || (dialect & PPC_OPCODE_PPC) == 0) + (*info->fprintf_func) (info->stream, "%ld", value); + else + { + if (operand->bits == 3) + (*info->fprintf_func) (info->stream, "cr%d", value); + else + { + static const char *cbnames[4] = { "lt", "gt", "eq", "so" }; + int cr; + int cc; + + cr = value >> 2; + if (cr != 0) + (*info->fprintf_func) (info->stream, "4*cr%d", cr); + cc = value & 3; + if (cc != 0) + { + if (cr != 0) + (*info->fprintf_func) (info->stream, "+"); + (*info->fprintf_func) (info->stream, "%s", cbnames[cc]); + } + } + } + + if (need_paren) + { + (*info->fprintf_func) (info->stream, ")"); + need_paren = 0; + } + + if ((operand->flags & PPC_OPERAND_PARENS) == 0) + need_comma = 1; + else + { + (*info->fprintf_func) (info->stream, "("); + need_paren = 1; + } + } + + /* We have found and printed an instruction; return. */ + return 4; + } + + /* We could not find a match. */ + (*info->fprintf_func) (info->stream, "0x%lx", insn); + + return 4; +} -- 2.30.2