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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [opcodes/] [open8-dis.c] - Rev 183
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/* Disassemble Open8 instructions. Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008, 2010, 2011 Free Software Foundation, Inc. Contributed by Kirk Hays <khays@hayshaus.com> This file is part of libopcodes. This library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. It is distributed in the hope that it 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 program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "sysdep.h" #include "dis-asm.h" #include "opintl.h" #include "libiberty.h" struct open8_opcodes_s { char *name; char *constraints; char *opcode; int insn_size; /* In bytes. */ int isa; unsigned long long opcode_bits; unsigned long long opcode_mask; }; #define OPEN8_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN, MASK) \ {#NAME, CONSTR, OPCODE, SIZE, ISA, BIN, MASK}, const struct open8_opcodes_s open8_opcodes[] = { #include "opcode/open8.h" {NULL, NULL, NULL, 0, 0, 0, 0} }; static const char * comment_start = "0x"; static int open8_operand (unsigned long long insn, int constraint, char *buf, int buf_len, char *comment, int comment_len, int *sym, bfd_vma *sym_addr) { int ok = 1; *sym = 0; switch (constraint) { /* Any register operand. */ case 'r': snprintf (buf, buf_len, "r%d", (int) ((insn & REG_MASK) >> REG_SHIFT)); break; /* Even numbered register. */ case 'e': snprintf (buf, buf_len, "r%d", (int) ((insn & EREG_MASK) >> EREG_SHIFT)); break; /* Unsigned offset expression, 8 bits. */ case 'u': snprintf (buf, buf_len, "%u", (int) ((insn & U_MASK) >> U_SHIFT)); break; /* Signed pc-relative offset expression, 8 bits. */ case 's': { int8_t t = ((insn & S_MASK) >> S_SHIFT); snprintf (buf, buf_len, "%d", (int)t); /* Propagate sign bit. */ } break; /* Immediate value expression, signed, 8 bits. */ case 'i': { int8_t t = ((insn & I_MASK) >> I_SHIFT); snprintf (buf, buf_len, "%d", (int)t); /* Propagate sign bit. */ } break; /* Immediate value expression, 3 bits. */ case 'n': { snprintf (buf, buf_len, "%u", (int) ((insn & N_MASK) >> N_SHIFT)); } break; /* Immediate value expression, 3 bits, indexing PSR. */ case 'b': { snprintf (buf, buf_len, "%u", (int) ((insn & B_MASK) >> B_SHIFT)); } break; /* Memory reference, 16 bits, unsigned. */ case 'M': { *sym = 1; *sym_addr = (bfd_vma) ((insn & M_MASK) >> M_SHIFT); snprintf (buf, buf_len, "%#lx", (unsigned long) *sym_addr); strncpy (comment, comment_start, comment_len); } break; /* JSR/JMP reference, 16 bits, unsigned. */ case 'h': { *sym = 1; *sym_addr = (bfd_vma) ((insn & H_MASK) >> H_SHIFT); snprintf (buf, buf_len, "%#lx", (unsigned long) *sym_addr); strncpy (comment, comment_start, comment_len); } break; /* JSR/JMP reference, 16 bits, unsigned, in composite branch. */ case 'H': { *sym = 1; *sym_addr = (bfd_vma) ((insn & BIG_H_MASK) >> BIG_H_SHIFT); snprintf (buf, buf_len, "%#lx", (unsigned long) *sym_addr); strncpy (comment, comment_start, comment_len); } break; /* autoincrement operator. */ case 'a': { if (insn & A_MASK) { snprintf (buf, buf_len, "%s", "++"); } } break; /* syntactic sugar - comma. */ case ',': { snprintf (buf, buf_len, "%s", ","); } break; default: { snprintf (buf, buf_len, "??"); fprintf (stderr, _("unknown constraint `%c'"), constraint); ok = 0; } } return ok; } static unsigned long long open8_dis_opcode (bfd_vma addr, disassemble_info *info) { bfd_byte buffer[sizeof (unsigned long long)]; int status; int readsize = sizeof buffer; /* Make sure we don't try to read past the end of the section. */ if (addr + readsize >= info->section->size) { readsize = info->section->size - addr; memset (buffer, 0, sizeof buffer); } status = info->read_memory_func (addr, buffer, readsize, info); if (status == 0) return bfd_getl64 (buffer); info->memory_error_func (status, addr, info); return -1; } int print_insn_open8 (bfd_vma addr, disassemble_info *info) { unsigned long long insn; const struct open8_opcodes_s *opcode; void *stream = info->stream; fprintf_ftype prin = info->fprintf_func; int ok = 0; char op1[20], op2[20], op3[20], comment1[40], comment2[40], comment3[40]; int comma1 = 0, comma2 = 0; int sym_op1 = 0, sym_op2 = 0, sym_op3 = 0; bfd_vma sym_addr1, sym_addr2, sym_addr3; if (info->symtab_size == 0) comment_start = " "; insn = open8_dis_opcode (addr, info); /* Scan the opcode descriptors, looking for an opcode match. */ for (opcode = open8_opcodes; opcode->name; opcode++) { /* If the memory anded with the mask matches required opcode bits, then we have a match. */ if ((insn & opcode->opcode_mask) == opcode->opcode_bits) { break; } } op1[0] = 0; op2[0] = 0; op3[0] = 0; comment1[0] = 0; comment2[0] = 0; comment3[0] = 0; /* Parse the binary value using the constraints. */ if (opcode->name) { char *op = opcode->constraints; ok = 1; if (*op) { /* Grab the first operand. */ ok = open8_operand (insn, *op++, op1, sizeof op1 - strlen (op1), comment1, sizeof comment1 - strlen (comment1), &sym_op1, &sym_addr1); /* Note a comma. */ if (ok && *op == ',') { comma1++; op++; } /* Grab the second operand. */ if (ok && *op) { ok = open8_operand (insn, *op++, op2, sizeof op2 - strlen (op2), (*comment1 ? comment2 : comment1), (*comment1 ? sizeof comment2 - strlen (comment2) : sizeof comment1 - strlen (comment1)), &sym_op2, &sym_addr2); } /* Note a comma. */ if (ok && *op == ',') { comma2++; op++; } /* Grab the third operand. */ if (ok && *op) { ok = open8_operand (insn, *op++, op3, sizeof op3 - strlen (op3), (*comment1 ? (*comment2 ? comment3 : comment2) : comment1), (*comment1 ? (*comment2 ? sizeof comment3 - strlen (comment3) : sizeof comment2 - strlen (comment2)) : sizeof comment1 - strlen (comment1)), &sym_op3, &sym_addr3); } } } if (!ok) { /* Unknown opcode, or invalid combination of operands. */ snprintf (op1, sizeof op1, "0x%04x", (unsigned int)insn); op2[0] = 0; op3[0] = 0; snprintf (comment1, sizeof comment1, "????"); comment2[0] = 0; comment3[0] = 0; } (*prin) (stream, "%s", ok ? opcode->name : ".word"); if (*op1) (*prin) (stream, "\t%s", op1); if (comma1) (*prin) (stream, "%s",","); if (*op2) (*prin) (stream, " %s", op2); if (comma2) (*prin) (stream, "%s",","); if (*op3) (*prin) (stream, " %s", op3); if (*comment1) (*prin) (stream, "\t; %s", comment1); if (sym_op1) info->print_address_func (sym_addr1, info); if (*comment2) (*prin) (stream, " %s", comment2); if (sym_op2) info->print_address_func (sym_addr2, info); if (*comment3) (*prin) (stream, " %s", comment3); if (sym_op3) info->print_address_func (sym_addr3, info); return opcode->insn_size; }
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