/* s12z-decode.c -- Freescale S12Z disassembly Copyright (C) 2018 Free Software Foundation, Inc. This file is part of the GNU opcodes library. 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 #include #include #include #include "opcode/s12z.h" #include "bfd.h" #include "s12z-opc.h" typedef int (* insn_bytes_f) (struct mem_read_abstraction_base *); typedef void (*operands_f) (struct mem_read_abstraction_base *, int *n_operands, struct operand **operand); typedef enum optr (*discriminator_f) (struct mem_read_abstraction_base *, enum optr hint); enum OPR_MODE { OPR_IMMe4, OPR_REG, OPR_OFXYS, OPR_XY_PRE_INC, OPR_XY_POST_INC, OPR_XY_PRE_DEC, OPR_XY_POST_DEC, OPR_S_PRE_DEC, OPR_S_POST_INC, OPR_REG_DIRECT, OPR_REG_INDIRECT, OPR_IDX_DIRECT, OPR_IDX_INDIRECT, OPR_EXT1, OPR_IDX2_REG, OPR_IDX3_DIRECT, OPR_IDX3_INDIRECT, OPR_EXT18, OPR_IDX3_DIRECT_REG, OPR_EXT3_DIRECT, OPR_EXT3_INDIRECT }; struct opr_pb { uint8_t mask; uint8_t value; int n_operands; enum OPR_MODE mode; }; static const struct opr_pb opr_pb[] = { {0xF0, 0x70, 1, OPR_IMMe4}, {0xF8, 0xB8, 1, OPR_REG}, {0xC0, 0x40, 1, OPR_OFXYS}, {0xEF, 0xE3, 1, OPR_XY_PRE_INC}, {0xEF, 0xE7, 1, OPR_XY_POST_INC}, {0xEF, 0xC3, 1, OPR_XY_PRE_DEC}, {0xEF, 0xC7, 1, OPR_XY_POST_DEC}, {0xFF, 0xFB, 1, OPR_S_PRE_DEC}, {0xFF, 0xFF, 1, OPR_S_POST_INC}, {0xC8, 0x88, 1, OPR_REG_DIRECT}, {0xE8, 0xC8, 1, OPR_REG_INDIRECT}, {0xCE, 0xC0, 2, OPR_IDX_DIRECT}, {0xCE, 0xC4, 2, OPR_IDX_INDIRECT}, {0xC0, 0x00, 2, OPR_EXT1}, {0xC8, 0x80, 3, OPR_IDX2_REG}, {0xFA, 0xF8, 3, OPR_EXT18}, {0xCF, 0xC2, 4, OPR_IDX3_DIRECT}, {0xCF, 0xC6, 4, OPR_IDX3_INDIRECT}, {0xF8, 0xE8, 4, OPR_IDX3_DIRECT_REG}, {0xFF, 0xFA, 4, OPR_EXT3_DIRECT}, {0xFF, 0xFE, 4, OPR_EXT3_INDIRECT}, }; /* Return the number of bytes in a OPR operand, including the XB postbyte. It does not include any preceeding opcodes. */ static int x_opr_n_bytes (struct mem_read_abstraction_base *mra, int offset) { bfd_byte xb; int status = mra->read (mra, offset, 1, &xb); if (status < 0) return status; size_t i; for (i = 0; i < sizeof (opr_pb) / sizeof (opr_pb[0]); ++i) { const struct opr_pb *pb = opr_pb + i; if ((xb & pb->mask) == pb->value) { return pb->n_operands; } } return 1; } static int opr_n_bytes_p1 (struct mem_read_abstraction_base *mra) { return 1 + x_opr_n_bytes (mra, 0); } static int opr_n_bytes2 (struct mem_read_abstraction_base *mra) { int s = x_opr_n_bytes (mra, 0); s += x_opr_n_bytes (mra, s); return s + 1; } enum BB_MODE { BB_REG_REG_REG, BB_REG_REG_IMM, BB_REG_OPR_REG, BB_OPR_REG_REG, BB_REG_OPR_IMM, BB_OPR_REG_IMM }; struct opr_bb { uint8_t mask; uint8_t value; int n_operands; bool opr; enum BB_MODE mode; }; static const struct opr_bb bb_modes[] = { {0x60, 0x00, 2, false, BB_REG_REG_REG}, {0x60, 0x20, 3, false, BB_REG_REG_IMM}, {0x70, 0x40, 2, true, BB_REG_OPR_REG}, {0x70, 0x50, 2, true, BB_OPR_REG_REG}, {0x70, 0x60, 3, true, BB_REG_OPR_IMM}, {0x70, 0x70, 3, true, BB_OPR_REG_IMM} }; static int bfextins_n_bytes (struct mem_read_abstraction_base *mra) { bfd_byte bb; int status = mra->read (mra, 0, 1, &bb); if (status < 0) return status; size_t i; const struct opr_bb *bbs = 0; for (i = 0; i < sizeof (bb_modes) / sizeof (bb_modes[0]); ++i) { bbs = bb_modes + i; if ((bb & bbs->mask) == bbs->value) { break; } } int n = bbs->n_operands; if (bbs->opr) n += x_opr_n_bytes (mra, n - 1); return n; } static int single (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED) { return 1; } static int two (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED) { return 2; } static int three (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED) { return 3; } static int four (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED) { return 4; } static int five (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED) { return 5; } static int pcrel_15bit (struct mem_read_abstraction_base *mra) { bfd_byte byte; int status = mra->read (mra, 0, 1, &byte); if (status < 0) return status; return (byte & 0x80) ? 3 : 2; } static int xysp_reg_from_postbyte (uint8_t postbyte) { int reg = -1; switch ((postbyte & 0x30) >> 4) { case 0: reg = REG_X; break; case 1: reg = REG_Y; break; case 2: reg = REG_S; break; default: reg = REG_P; } return reg; } static struct operand * create_immediate_operand (int value) { struct immediate_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_IMMEDIATE; op->value = value; ((struct operand *)op)->osize = -1; return (struct operand *) op; } static struct operand * create_bitfield_operand (int width, int offset) { struct bitfield_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_BIT_FIELD; op->width = width; op->offset = offset; ((struct operand *)op)->osize = -1; return (struct operand *) op; } static struct operand * create_register_operand_with_size (int reg, short osize) { struct register_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_REGISTER; op->reg = reg; ((struct operand *)op)->osize = osize; return (struct operand *) op; } static struct operand * create_register_operand (int reg) { return create_register_operand_with_size (reg, -1); } static struct operand * create_register_all_operand (void) { struct register_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_REGISTER_ALL; ((struct operand *)op)->osize = -1; return (struct operand *) op; } static struct operand * create_register_all16_operand (void) { struct register_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_REGISTER_ALL16; ((struct operand *)op)->osize = -1; return (struct operand *) op; } static struct operand * create_simple_memory_operand (bfd_vma addr, bfd_vma base, bool relative) { struct simple_memory_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_SIMPLE_MEMORY; op->addr = addr; op->base = base; op->relative = relative; ((struct operand *)op)->osize = -1; assert (relative || base == 0); return (struct operand *) op; } static struct operand * create_memory_operand (bool indirect, int base, int n_regs, int reg0, int reg1) { struct memory_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_MEMORY; op->indirect = indirect; op->base_offset = base; op->mutation = OPND_RM_NONE; op->n_regs = n_regs; op->regs[0] = reg0; op->regs[1] = reg1; ((struct operand *)op)->osize = -1; return (struct operand *) op; } static struct operand * create_memory_auto_operand (enum op_reg_mutation mutation, int reg) { struct memory_operand *op = malloc (sizeof (*op)); ((struct operand *)op)->cl = OPND_CL_MEMORY; op->indirect = false; op->base_offset = 0; op->mutation = mutation; op->n_regs = 1; op->regs[0] = reg; op->regs[1] = -1; ((struct operand *)op)->osize = -1; return (struct operand *) op; } static void z_ext24_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { uint8_t buffer[3]; int status = mra->read (mra, 0, 3, buffer); if (status < 0) return; int i; uint32_t addr = 0; for (i = 0; i < 3; ++i) { addr <<= 8; addr |= buffer[i]; } operand[(*n_operands)++] = create_simple_memory_operand (addr, 0, false); } static uint32_t z_decode_signed_value (struct mem_read_abstraction_base *mra, int offset, short size) { assert (size >0); assert (size <= 4); bfd_byte buffer[4]; if (0 > mra->read (mra, offset, size, buffer)) { return 0; } int i; uint32_t value = 0; for (i = 0; i < size; ++i) { value |= buffer[i] << (8 * (size - i - 1)); } if (buffer[0] & 0x80) { /* Deal with negative values */ value -= 0x1UL << (size * 8); } return value; } static uint32_t decode_signed_value (struct mem_read_abstraction_base *mra, short size) { return z_decode_signed_value (mra, 0, size); } static void x_imm1 (struct mem_read_abstraction_base *mra, int offset, int *n_operands, struct operand **operand) { bfd_byte byte; int status = mra->read (mra, offset, 1, &byte); if (status < 0) return; operand[(*n_operands)++] = create_immediate_operand (byte); } /* An eight bit immediate operand. */ static void imm1_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { x_imm1 (mra, 0, n_operands, operand); } static void trap_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { x_imm1 (mra, -1, n_operands, operand); } static struct operand * x_opr_decode_with_size (struct mem_read_abstraction_base *mra, int offset, short osize) { bfd_byte postbyte; int status = mra->read (mra, offset, 1, &postbyte); if (status < 0) return NULL; offset++; enum OPR_MODE mode = -1; size_t i; for (i = 0; i < sizeof (opr_pb) / sizeof (opr_pb[0]); ++i) { const struct opr_pb *pb = opr_pb + i; if ((postbyte & pb->mask) == pb->value) { mode = pb->mode; break; } } struct operand *operand = NULL; switch (mode) { case OPR_IMMe4: { int n; uint8_t x = (postbyte & 0x0F); if (x == 0) n = -1; else n = x; operand = create_immediate_operand (n); break; } case OPR_REG: { uint8_t x = (postbyte & 0x07); operand = create_register_operand (x); break; } case OPR_OFXYS: { operand = create_memory_operand (false, postbyte & 0x0F, 1, xysp_reg_from_postbyte (postbyte), -1); break; } case OPR_REG_DIRECT: { operand = create_memory_operand (false, 0, 2, postbyte & 0x07, xysp_reg_from_postbyte (postbyte)); break; } case OPR_REG_INDIRECT: { operand = create_memory_operand (true, 0, 2, postbyte & 0x07, (postbyte & 0x10) ? REG_Y : REG_X); break; } case OPR_IDX_INDIRECT: { uint8_t x1; mra->read (mra, offset, 1, &x1); int idx = x1; if (postbyte & 0x01) { /* Deal with negative values */ idx -= 0x1UL << 8; } operand = create_memory_operand (true, idx, 1, xysp_reg_from_postbyte (postbyte), -1); break; } case OPR_IDX3_DIRECT: { uint8_t x[3]; mra->read (mra, offset, 3, x); int idx = x[0] << 16 | x[1] << 8 | x[2]; if (x[0] & 0x80) { /* Deal with negative values */ idx -= 0x1UL << 24; } operand = create_memory_operand (false, idx, 1, xysp_reg_from_postbyte (postbyte), -1); break; } case OPR_IDX3_DIRECT_REG: { uint8_t x[3]; mra->read (mra, offset, 3, x); int idx = x[0] << 16 | x[1] << 8 | x[2]; if (x[0] & 0x80) { /* Deal with negative values */ idx -= 0x1UL << 24; } operand = create_memory_operand (false, idx, 1, postbyte & 0x07, -1); break; } case OPR_IDX3_INDIRECT: { uint8_t x[3]; mra->read (mra, offset, 3, x); int idx = x[0] << 16 | x[1] << 8 | x[2]; if (x[0] & 0x80) { /* Deal with negative values */ idx -= 0x1UL << 24; } operand = create_memory_operand (true, idx, 1, xysp_reg_from_postbyte (postbyte), -1); break; } case OPR_IDX_DIRECT: { uint8_t x1; mra->read (mra, offset, 1, &x1); int idx = x1; if (postbyte & 0x01) { /* Deal with negative values */ idx -= 0x1UL << 8; } operand = create_memory_operand (false, idx, 1, xysp_reg_from_postbyte (postbyte), -1); break; } case OPR_IDX2_REG: { uint8_t x[2]; mra->read (mra, offset, 2, x); uint32_t idx = x[1] | x[0] << 8 ; idx |= (postbyte & 0x30) << 12; operand = create_memory_operand (false, idx, 1, postbyte & 0x07, -1); break; } case OPR_XY_PRE_INC: { operand = create_memory_auto_operand (OPND_RM_PRE_INC, (postbyte & 0x10) ? REG_Y: REG_X); break; } case OPR_XY_POST_INC: { operand = create_memory_auto_operand (OPND_RM_POST_INC, (postbyte & 0x10) ? REG_Y: REG_X); break; } case OPR_XY_PRE_DEC: { operand = create_memory_auto_operand (OPND_RM_PRE_DEC, (postbyte & 0x10) ? REG_Y: REG_X); break; } case OPR_XY_POST_DEC: { operand = create_memory_auto_operand (OPND_RM_POST_DEC, (postbyte & 0x10) ? REG_Y: REG_X); break; } case OPR_S_PRE_DEC: { operand = create_memory_auto_operand (OPND_RM_PRE_DEC, REG_S); break; } case OPR_S_POST_INC: { operand = create_memory_auto_operand (OPND_RM_POST_INC, REG_S); break; } case OPR_EXT18: { const size_t size = 2; bfd_byte buffer[4]; status = mra->read (mra, offset, size, buffer); if (status < 0) operand = NULL; uint32_t ext18 = 0; for (i = 0; i < size; ++i) { ext18 <<= 8; ext18 |= buffer[i]; } ext18 |= (postbyte & 0x01) << 16; ext18 |= (postbyte & 0x04) << 15; operand = create_simple_memory_operand (ext18, 0, false); break; } case OPR_EXT1: { uint8_t x1 = 0; mra->read (mra, offset, 1, &x1); int16_t addr; addr = x1; addr |= (postbyte & 0x3f) << 8; operand = create_simple_memory_operand (addr, 0, false); break; } case OPR_EXT3_DIRECT: { const size_t size = 3; bfd_byte buffer[4]; status = mra->read (mra, offset, size, buffer); if (status < 0) operand = NULL; uint32_t ext24 = 0; for (i = 0; i < size; ++i) { ext24 |= buffer[i] << (8 * (size - i - 1)); } operand = create_simple_memory_operand (ext24, 0, false); break; } case OPR_EXT3_INDIRECT: { const size_t size = 3; bfd_byte buffer[4]; status = mra->read (mra, offset, size, buffer); if (status < 0) operand = NULL; uint32_t ext24 = 0; for (i = 0; i < size; ++i) { ext24 |= buffer[i] << (8 * (size - i - 1)); } operand = create_memory_operand (true, ext24, 0, -1, -1); break; } default: printf ("Unknown OPR mode #0x%x (%d)", postbyte, mode); abort (); } operand->osize = osize; return operand; } static struct operand * x_opr_decode (struct mem_read_abstraction_base *mra, int offset) { return x_opr_decode_with_size (mra, offset, -1); } static void z_opr_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { operand[(*n_operands)++] = x_opr_decode (mra, 0); } static void z_opr_decode2 (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { int n = x_opr_n_bytes (mra, 0); operand[(*n_operands)++] = x_opr_decode (mra, 0); operand[(*n_operands)++] = x_opr_decode (mra, n); } static void imm1234 (struct mem_read_abstraction_base *mra, int base, int *n_operands, struct operand **operand) { bfd_byte opcode; int status = mra->read (mra, -1, 1, &opcode); if (status < 0) return; opcode -= base; int size = registers[opcode & 0xF].bytes; uint32_t imm = decode_signed_value (mra, size); operand[(*n_operands)++] = create_immediate_operand (imm); } /* Special case of LD and CMP with register S and IMM operand */ static void reg_s_imm (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { operand[(*n_operands)++] = create_register_operand (REG_S); uint32_t imm = decode_signed_value (mra, 3); operand[(*n_operands)++] = create_immediate_operand (imm); } /* Special case of LD, CMP and ST with register S and OPR operand */ static void reg_s_opr (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { operand[(*n_operands)++] = create_register_operand (REG_S); operand[(*n_operands)++] = x_opr_decode (mra, 0); } static void z_imm1234_8base (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { imm1234 (mra, 8, n_operands, operand); } static void z_imm1234_0base (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { imm1234 (mra, 0, n_operands, operand); } static void z_tfr (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { bfd_byte byte; int status = mra->read (mra, 0, 1, &byte); if (status < 0) return; operand[(*n_operands)++] = create_register_operand (byte >> 4); operand[(*n_operands)++] = create_register_operand (byte & 0x0F); } static void z_reg (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { bfd_byte byte; int status = mra->read (mra, -1, 1, &byte); if (status < 0) return; operand[(*n_operands)++] = create_register_operand (byte & 0x07); } static void reg_xy (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { bfd_byte byte; int status = mra->read (mra, -1, 1, &byte); if (status < 0) return; operand[(*n_operands)++] = create_register_operand ((byte & 0x01) ? REG_Y : REG_X); } static void lea_reg_xys_opr (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { bfd_byte byte; int status = mra->read (mra, -1, 1, &byte); if (status < 0) return; int reg_xys = -1; switch (byte & 0x03) { case 0x00: reg_xys = REG_X; break; case 0x01: reg_xys = REG_Y; break; case 0x02: reg_xys = REG_S; break; } operand[(*n_operands)++] = create_register_operand (reg_xys); operand[(*n_operands)++] = x_opr_decode (mra, 0); } static void lea_reg_xys (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { bfd_byte byte; int status = mra->read (mra, -1, 1, &byte); if (status < 0) return; int reg_n = -1; switch (byte & 0x03) { case 0x00: reg_n = REG_X; break; case 0x01: reg_n = REG_Y; break; case 0x02: reg_n = REG_S; break; } status = mra->read (mra, 0, 1, &byte); if (status < 0) return; operand[(*n_operands)++] = create_register_operand (reg_n); operand[(*n_operands)++] = create_memory_operand (false, (int8_t) byte, 1, reg_n, -1); } /* PC Relative offsets of size 15 or 7 bits */ static void rel_15_7 (struct mem_read_abstraction_base *mra, int offset, int *n_operands, struct operand **operands) { bfd_byte upper; int status = mra->read (mra, offset - 1, 1, &upper); if (status < 0) return; bool rel_size = (upper & 0x80); int16_t addr = upper; if (rel_size) { /* 15 bits. Get the next byte */ bfd_byte lower; status = mra->read (mra, offset, 1, &lower); if (status < 0) return; addr <<= 8; addr |= lower; addr &= 0x7FFF; bool negative = (addr & 0x4000); addr &= 0x3FFF; if (negative) addr = addr - 0x4000; } else { /* 7 bits. */ bool negative = (addr & 0x40); addr &= 0x3F; if (negative) addr = addr - 0x40; } operands[(*n_operands)++] = create_simple_memory_operand (addr, mra->posn (mra) - 1, true); } /* PC Relative offsets of size 15 or 7 bits */ static void decode_rel_15_7 (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { rel_15_7 (mra, 1, n_operands, operand); } static int shift_n_bytes (struct mem_read_abstraction_base *); static int mov_imm_opr_n_bytes (struct mem_read_abstraction_base *); static int loop_prim_n_bytes (struct mem_read_abstraction_base *); static int bm_rel_n_bytes (struct mem_read_abstraction_base *); static int mul_n_bytes (struct mem_read_abstraction_base *); static int bm_n_bytes (struct mem_read_abstraction_base *); static void psh_pul_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand); static void shift_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand); static void mul_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand); static void bm_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand); static void bm_rel_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand); static void mov_imm_opr (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand); static void loop_primitive_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands); static void bit_field_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands); static void exg_sex_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands); static enum optr shift_discrim (struct mem_read_abstraction_base *mra, enum optr hint); static enum optr psh_pul_discrim (struct mem_read_abstraction_base *mra, enum optr hint); static enum optr mul_discrim (struct mem_read_abstraction_base *mra, enum optr hint); static enum optr loop_primitive_discrim (struct mem_read_abstraction_base *mra, enum optr hint); static enum optr bit_field_discrim (struct mem_read_abstraction_base *mra, enum optr hint); static enum optr exg_sex_discrim (struct mem_read_abstraction_base *mra, enum optr hint); static void cmp_xy (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED, int *n_operands, struct operand **operand) { operand[(*n_operands)++] = create_register_operand (REG_X); operand[(*n_operands)++] = create_register_operand (REG_Y); } static void sub_d6_x_y (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED, int *n_operands, struct operand **operand) { operand[(*n_operands)++] = create_register_operand (REG_D6); operand[(*n_operands)++] = create_register_operand (REG_X); operand[(*n_operands)++] = create_register_operand (REG_Y); } static void sub_d6_y_x (struct mem_read_abstraction_base *mra ATTRIBUTE_UNUSED, int *n_operands, struct operand **operand) { operand[(*n_operands)++] = create_register_operand (REG_D6); operand[(*n_operands)++] = create_register_operand (REG_Y); operand[(*n_operands)++] = create_register_operand (REG_X); } static void ld_18bit_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand); static enum optr mul_discrim (struct mem_read_abstraction_base *mra, enum optr hint) { uint8_t mb; int status = mra->read (mra, 0, 1, &mb); if (status < 0) return OP_INVALID; bool signed_op = (mb & 0x80); switch (hint) { case OPBASE_mul: return signed_op ? OP_muls : OP_mulu; break; case OPBASE_div: return signed_op ? OP_divs : OP_divu; break; case OPBASE_mod: return signed_op ? OP_mods : OP_modu; break; case OPBASE_mac: return signed_op ? OP_macs : OP_macu; break; case OPBASE_qmul: return signed_op ? OP_qmuls : OP_qmulu; break; default: abort (); } return OP_INVALID; } struct opcode { /* The operation that this opcode performs. */ enum optr operator; /* The size of this operation. May be -1 if it is implied in the operands or if size is not applicable. */ short osize; /* Some operations need this function to work out which operation is intended. */ discriminator_f discriminator; /* A function returning the number of bytes in this instruction. */ insn_bytes_f insn_bytes; operands_f operands; operands_f operands2; }; static const struct opcode page2[] = { [0x00] = {OP_ld, -1, 0, opr_n_bytes_p1, reg_s_opr, 0}, [0x01] = {OP_st, -1, 0, opr_n_bytes_p1, reg_s_opr, 0}, [0x02] = {OP_cmp, -1, 0, opr_n_bytes_p1, reg_s_opr, 0}, [0x03] = {OP_ld, -1, 0, four, reg_s_imm, 0}, [0x04] = {OP_cmp, -1, 0, four, reg_s_imm, 0}, [0x05] = {OP_stop, -1, 0, single, 0, 0}, [0x06] = {OP_wai, -1, 0, single, 0, 0}, [0x07] = {OP_sys, -1, 0, single, 0, 0}, [0x08] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, /* BFEXT / BFINS */ [0x09] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, [0x0a] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, [0x0b] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, [0x0c] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, [0x0d] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, [0x0e] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, [0x0f] = {0xFFFF, -1, bit_field_discrim, bfextins_n_bytes, bit_field_decode, 0}, [0x10] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x11] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x12] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x13] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x14] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x15] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x16] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x17] = {OP_minu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x18] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x19] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x1a] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x1b] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x1c] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x1d] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x1e] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x1f] = {OP_maxu, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x20] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x21] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x22] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x23] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x24] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x25] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x26] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x27] = {OP_mins, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x28] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x29] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x2a] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x2b] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x2c] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x2d] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x2e] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x2f] = {OP_maxs, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x30] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x31] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x32] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x33] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x34] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x35] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x36] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x37] = {OPBASE_div, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x38] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x39] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x3a] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x3b] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x3c] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x3d] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x3e] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x3f] = {OPBASE_mod, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x40] = {OP_abs, -1, 0, single, z_reg, 0}, [0x41] = {OP_abs, -1, 0, single, z_reg, 0}, [0x42] = {OP_abs, -1, 0, single, z_reg, 0}, [0x43] = {OP_abs, -1, 0, single, z_reg, 0}, [0x44] = {OP_abs, -1, 0, single, z_reg, 0}, [0x45] = {OP_abs, -1, 0, single, z_reg, 0}, [0x46] = {OP_abs, -1, 0, single, z_reg, 0}, [0x47] = {OP_abs, -1, 0, single, z_reg, 0}, [0x48] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x49] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4a] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4b] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4c] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4d] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4e] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4f] = {OPBASE_mac, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x50] = {OP_adc, -1, 0, three, z_reg, z_imm1234_0base}, [0x51] = {OP_adc, -1, 0, three, z_reg, z_imm1234_0base}, [0x52] = {OP_adc, -1, 0, three, z_reg, z_imm1234_0base}, [0x53] = {OP_adc, -1, 0, three, z_reg, z_imm1234_0base}, [0x54] = {OP_adc, -1, 0, two, z_reg, z_imm1234_0base}, [0x55] = {OP_adc, -1, 0, two, z_reg, z_imm1234_0base}, [0x56] = {OP_adc, -1, 0, five, z_reg, z_imm1234_0base}, [0x57] = {OP_adc, -1, 0, five, z_reg, z_imm1234_0base}, [0x58] = {OP_bit, -1, 0, three, z_reg, z_imm1234_8base}, [0x59] = {OP_bit, -1, 0, three, z_reg, z_imm1234_8base}, [0x5a] = {OP_bit, -1, 0, three, z_reg, z_imm1234_8base}, [0x5b] = {OP_bit, -1, 0, three, z_reg, z_imm1234_8base}, [0x5c] = {OP_bit, -1, 0, two, z_reg, z_imm1234_8base}, [0x5d] = {OP_bit, -1, 0, two, z_reg, z_imm1234_8base}, [0x5e] = {OP_bit, -1, 0, five, z_reg, z_imm1234_8base}, [0x5f] = {OP_bit, -1, 0, five, z_reg, z_imm1234_8base}, [0x60] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x61] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x62] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x63] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x64] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x65] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x66] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x67] = {OP_adc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x68] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x69] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6a] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6b] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6c] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6d] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6e] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6f] = {OP_bit, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x70] = {OP_sbc, -1, 0, three, z_reg, z_imm1234_0base}, [0x71] = {OP_sbc, -1, 0, three, z_reg, z_imm1234_0base}, [0x72] = {OP_sbc, -1, 0, three, z_reg, z_imm1234_0base}, [0x73] = {OP_sbc, -1, 0, three, z_reg, z_imm1234_0base}, [0x74] = {OP_sbc, -1, 0, two, z_reg, z_imm1234_0base}, [0x75] = {OP_sbc, -1, 0, two, z_reg, z_imm1234_0base}, [0x76] = {OP_sbc, -1, 0, five, z_reg, z_imm1234_0base}, [0x77] = {OP_sbc, -1, 0, five, z_reg, z_imm1234_0base}, [0x78] = {OP_eor, -1, 0, three, z_reg, z_imm1234_8base}, [0x79] = {OP_eor, -1, 0, three, z_reg, z_imm1234_8base}, [0x7a] = {OP_eor, -1, 0, three, z_reg, z_imm1234_8base}, [0x7b] = {OP_eor, -1, 0, three, z_reg, z_imm1234_8base}, [0x7c] = {OP_eor, -1, 0, two, z_reg, z_imm1234_8base}, [0x7d] = {OP_eor, -1, 0, two, z_reg, z_imm1234_8base}, [0x7e] = {OP_eor, -1, 0, five, z_reg, z_imm1234_8base}, [0x7f] = {OP_eor, -1, 0, five, z_reg, z_imm1234_8base}, [0x80] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x81] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x82] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x83] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x84] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x85] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x86] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x87] = {OP_sbc, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x88] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x89] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8a] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8b] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8c] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8d] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8e] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8f] = {OP_eor, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x90] = {OP_rti, -1, 0, single, 0, 0}, [0x91] = {OP_clb, -1, 0, two, z_tfr, 0}, [0x92] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x93] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x94] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x95] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x96] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x97] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x98] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x99] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x9a] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x9b] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x9c] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x9d] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x9e] = {OP_trap, -1, 0, single, trap_decode, 0}, [0x9f] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xa0] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa1] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa2] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa3] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa4] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa5] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa6] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa7] = {OP_sat, -1, 0, single, z_reg, 0}, [0xa8] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xa9] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xaa] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xab] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xac] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xad] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xae] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xaf] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xb0] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb1] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb2] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb3] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb4] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb5] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb6] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb7] = {OPBASE_qmul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0xb8] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xb9] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xba] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xbb] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xbc] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xbd] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xbe] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xbf] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc0] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc1] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc2] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc3] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc4] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc5] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc6] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc7] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc8] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xc9] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xca] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xcb] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xcc] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xcd] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xce] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xcf] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd0] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd1] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd2] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd3] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd4] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd5] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd6] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd7] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd8] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xd9] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xda] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xdb] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xdc] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xdd] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xde] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xdf] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe0] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe1] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe2] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe3] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe4] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe5] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe6] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe7] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe8] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xe9] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xea] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xeb] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xec] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xed] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xee] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xef] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf0] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf1] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf2] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf3] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf4] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf5] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf6] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf7] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf8] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xf9] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xfa] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xfb] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xfc] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xfd] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xfe] = {OP_trap, -1, 0, single, trap_decode, 0}, [0xff] = {OP_trap, -1, 0, single, trap_decode, 0}, }; static const struct opcode page1[] = { [0x00] = {OP_bgnd, -1, 0, single, 0, 0}, [0x01] = {OP_nop, -1, 0, single, 0, 0}, [0x02] = {OP_brclr, -1, 0, bm_rel_n_bytes, bm_rel_decode, 0}, [0x03] = {OP_brset, -1, 0, bm_rel_n_bytes, bm_rel_decode, 0}, [0x04] = {0xFFFF, -1, psh_pul_discrim, two, psh_pul_decode, 0}, /* psh/pul */ [0x05] = {OP_rts, -1, 0, single, 0, 0}, [0x06] = {OP_lea, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x07] = {OP_lea, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x08] = {OP_lea, -1, 0, opr_n_bytes_p1, lea_reg_xys_opr, 0}, [0x09] = {OP_lea, -1, 0, opr_n_bytes_p1, lea_reg_xys_opr, 0}, [0x0a] = {OP_lea, -1, 0, opr_n_bytes_p1, lea_reg_xys_opr, 0}, [0x0b] = {0xFFFF, -1, loop_primitive_discrim, loop_prim_n_bytes, loop_primitive_decode, 0}, /* Loop primitives TBcc / DBcc */ [0x0c] = {OP_mov, 0, 0, mov_imm_opr_n_bytes, mov_imm_opr, 0}, [0x0d] = {OP_mov, 1, 0, mov_imm_opr_n_bytes, mov_imm_opr, 0}, [0x0e] = {OP_mov, 2, 0, mov_imm_opr_n_bytes, mov_imm_opr, 0}, [0x0f] = {OP_mov, 3, 0, mov_imm_opr_n_bytes, mov_imm_opr, 0}, [0x10] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, /* lsr/lsl/asl/asr/rol/ror */ [0x11] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, [0x12] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, [0x13] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, [0x14] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, [0x15] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, [0x16] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, [0x17] = {0xFFFF, -1, shift_discrim, shift_n_bytes, shift_decode, 0}, [0x18] = {OP_lea, -1, 0, two, lea_reg_xys, NULL}, [0x19] = {OP_lea, -1, 0, two, lea_reg_xys, NULL}, [0x1a] = {OP_lea, -1, 0, two, lea_reg_xys, NULL}, /* 0x1b PG2 */ [0x1c] = {OP_mov, 0, 0, opr_n_bytes2, z_opr_decode2, 0}, [0x1d] = {OP_mov, 1, 0, opr_n_bytes2, z_opr_decode2, 0}, [0x1e] = {OP_mov, 2, 0, opr_n_bytes2, z_opr_decode2, 0}, [0x1f] = {OP_mov, 3, 0, opr_n_bytes2, z_opr_decode2, 0}, [0x20] = {OP_bra, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x21] = {OP_bsr, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x22] = {OP_bhi, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x23] = {OP_bls, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x24] = {OP_bcc, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x25] = {OP_bcs, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x26] = {OP_bne, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x27] = {OP_beq, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x28] = {OP_bvc, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x29] = {OP_bvs, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x2a] = {OP_bpl, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x2b] = {OP_bmi, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x2c] = {OP_bge, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x2d] = {OP_blt, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x2e] = {OP_bgt, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x2f] = {OP_ble, -1, 0, pcrel_15bit, decode_rel_15_7, 0}, [0x30] = {OP_inc, -1, 0, single, z_reg, 0}, [0x31] = {OP_inc, -1, 0, single, z_reg, 0}, [0x32] = {OP_inc, -1, 0, single, z_reg, 0}, [0x33] = {OP_inc, -1, 0, single, z_reg, 0}, [0x34] = {OP_inc, -1, 0, single, z_reg, 0}, [0x35] = {OP_inc, -1, 0, single, z_reg, 0}, [0x36] = {OP_inc, -1, 0, single, z_reg, 0}, [0x37] = {OP_inc, -1, 0, single, z_reg, 0}, [0x38] = {OP_clr, -1, 0, single, z_reg, 0}, [0x39] = {OP_clr, -1, 0, single, z_reg, 0}, [0x3a] = {OP_clr, -1, 0, single, z_reg, 0}, [0x3b] = {OP_clr, -1, 0, single, z_reg, 0}, [0x3c] = {OP_clr, -1, 0, single, z_reg, 0}, [0x3d] = {OP_clr, -1, 0, single, z_reg, 0}, [0x3e] = {OP_clr, -1, 0, single, z_reg, 0}, [0x3f] = {OP_clr, -1, 0, single, z_reg, 0}, [0x40] = {OP_dec, -1, 0, single, z_reg, 0}, [0x41] = {OP_dec, -1, 0, single, z_reg, 0}, [0x42] = {OP_dec, -1, 0, single, z_reg, 0}, [0x43] = {OP_dec, -1, 0, single, z_reg, 0}, [0x44] = {OP_dec, -1, 0, single, z_reg, 0}, [0x45] = {OP_dec, -1, 0, single, z_reg, 0}, [0x46] = {OP_dec, -1, 0, single, z_reg, 0}, [0x47] = {OP_dec, -1, 0, single, z_reg, 0}, [0x48] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x49] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4a] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4b] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4c] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4d] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4e] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x4f] = {OPBASE_mul, -1, mul_discrim, mul_n_bytes, mul_decode, 0}, [0x50] = {OP_add, -1, 0, three, z_reg, z_imm1234_0base}, [0x51] = {OP_add, -1, 0, three, z_reg, z_imm1234_0base}, [0x52] = {OP_add, -1, 0, three, z_reg, z_imm1234_0base}, [0x53] = {OP_add, -1, 0, three, z_reg, z_imm1234_0base}, [0x54] = {OP_add, -1, 0, two, z_reg, z_imm1234_0base}, [0x55] = {OP_add, -1, 0, two, z_reg, z_imm1234_0base}, [0x56] = {OP_add, -1, 0, five, z_reg, z_imm1234_0base}, [0x57] = {OP_add, -1, 0, five, z_reg, z_imm1234_0base}, [0x58] = {OP_and, -1, 0, three, z_reg, z_imm1234_8base}, [0x59] = {OP_and, -1, 0, three, z_reg, z_imm1234_8base}, [0x5a] = {OP_and, -1, 0, three, z_reg, z_imm1234_8base}, [0x5b] = {OP_and, -1, 0, three, z_reg, z_imm1234_8base}, [0x5c] = {OP_and, -1, 0, two, z_reg, z_imm1234_8base}, [0x5d] = {OP_and, -1, 0, two, z_reg, z_imm1234_8base}, [0x5e] = {OP_and, -1, 0, five, z_reg, z_imm1234_8base}, [0x5f] = {OP_and, -1, 0, five, z_reg, z_imm1234_8base}, [0x60] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x61] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x62] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x63] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x64] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x65] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x66] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x67] = {OP_add, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x68] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x69] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6a] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6b] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6c] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6d] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6e] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x6f] = {OP_and, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x70] = {OP_sub, -1, 0, three, z_reg, z_imm1234_0base}, [0x71] = {OP_sub, -1, 0, three, z_reg, z_imm1234_0base}, [0x72] = {OP_sub, -1, 0, three, z_reg, z_imm1234_0base}, [0x73] = {OP_sub, -1, 0, three, z_reg, z_imm1234_0base}, [0x74] = {OP_sub, -1, 0, two, z_reg, z_imm1234_0base}, [0x75] = {OP_sub, -1, 0, two, z_reg, z_imm1234_0base}, [0x76] = {OP_sub, -1, 0, five, z_reg, z_imm1234_0base}, [0x77] = {OP_sub, -1, 0, five, z_reg, z_imm1234_0base}, [0x78] = {OP_or, -1, 0, three, z_reg, z_imm1234_8base}, [0x79] = {OP_or, -1, 0, three, z_reg, z_imm1234_8base}, [0x7a] = {OP_or, -1, 0, three, z_reg, z_imm1234_8base}, [0x7b] = {OP_or, -1, 0, three, z_reg, z_imm1234_8base}, [0x7c] = {OP_or, -1, 0, two, z_reg, z_imm1234_8base}, [0x7d] = {OP_or, -1, 0, two, z_reg, z_imm1234_8base}, [0x7e] = {OP_or, -1, 0, five, z_reg, z_imm1234_8base}, [0x7f] = {OP_or, -1, 0, five, z_reg, z_imm1234_8base}, [0x80] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x81] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x82] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x83] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x84] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x85] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x86] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x87] = {OP_sub, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x88] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x89] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8a] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8b] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8c] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8d] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8e] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x8f] = {OP_or, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0x90] = {OP_ld, -1, 0, three, z_reg, z_imm1234_0base}, [0x91] = {OP_ld, -1, 0, three, z_reg, z_imm1234_0base}, [0x92] = {OP_ld, -1, 0, three, z_reg, z_imm1234_0base}, [0x93] = {OP_ld, -1, 0, three, z_reg, z_imm1234_0base}, [0x94] = {OP_ld, -1, 0, two, z_reg, z_imm1234_0base}, [0x95] = {OP_ld, -1, 0, two, z_reg, z_imm1234_0base}, [0x96] = {OP_ld, -1, 0, five, z_reg, z_imm1234_0base}, [0x97] = {OP_ld, -1, 0, five, z_reg, z_imm1234_0base}, [0x98] = {OP_ld, -1, 0, four, reg_xy, z_imm1234_0base}, [0x99] = {OP_ld, -1, 0, four, reg_xy, z_imm1234_0base}, [0x9a] = {OP_clr, -1, 0, single, reg_xy, 0}, [0x9b] = {OP_clr, -1, 0, single, reg_xy, 0}, [0x9c] = {OP_inc, 0, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0x9d] = {OP_inc, 1, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0x9e] = {OP_tfr, -1, 0, two, z_tfr, NULL}, [0x9f] = {OP_inc, 3, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xa0] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa1] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa2] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa3] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa4] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa5] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa6] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa7] = {OP_ld, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xa8] = {OP_ld, -1, 0, opr_n_bytes_p1, reg_xy, z_opr_decode}, [0xa9] = {OP_ld, -1, 0, opr_n_bytes_p1, reg_xy, z_opr_decode}, [0xaa] = {OP_jmp, -1, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xab] = {OP_jsr, -1, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xac] = {OP_dec, 0, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xad] = {OP_dec, 1, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xae] = {0xFFFF, -1, exg_sex_discrim, two, exg_sex_decode, 0}, /* EXG / SEX */ [0xaf] = {OP_dec, 3, 0, opr_n_bytes_p1, 0, z_opr_decode}, [0xb0] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb1] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb2] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb3] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb4] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb5] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb6] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb7] = {OP_ld, -1, 0, four, z_reg, z_ext24_decode}, [0xb8] = {OP_ld, -1, 0, four, reg_xy, z_ext24_decode}, [0xb9] = {OP_ld, -1, 0, four, reg_xy, z_ext24_decode}, [0xba] = {OP_jmp, -1, 0, four, z_ext24_decode, 0}, [0xbb] = {OP_jsr, -1, 0, four, z_ext24_decode, 0}, [0xbc] = {OP_clr, 0, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xbd] = {OP_clr, 1, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xbe] = {OP_clr, 2, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xbf] = {OP_clr, 3, 0, opr_n_bytes_p1, z_opr_decode, 0}, [0xc0] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc1] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc2] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc3] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc4] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc5] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc6] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc7] = {OP_st, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xc8] = {OP_st, -1, 0, opr_n_bytes_p1, reg_xy, z_opr_decode}, [0xc9] = {OP_st, -1, 0, opr_n_bytes_p1, reg_xy, z_opr_decode}, [0xca] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xcb] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xcc] = {OP_com, 0, 0, opr_n_bytes_p1, NULL, z_opr_decode}, [0xcd] = {OP_com, 1, 0, opr_n_bytes_p1, NULL, z_opr_decode}, [0xce] = {OP_andcc, -1, 0, two, imm1_decode, 0}, [0xcf] = {OP_com, 3, 0, opr_n_bytes_p1, NULL, z_opr_decode}, [0xd0] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd1] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd2] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd3] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd4] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd5] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd6] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd7] = {OP_st, -1, 0, four, z_reg, z_ext24_decode}, [0xd8] = {OP_st, -1, 0, four, reg_xy, z_ext24_decode}, [0xd9] = {OP_st, -1, 0, four, reg_xy, z_ext24_decode}, [0xda] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xdb] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xdc] = {OP_neg, 0, 0, opr_n_bytes_p1, NULL, z_opr_decode}, [0xdd] = {OP_neg, 1, 0, opr_n_bytes_p1, NULL, z_opr_decode}, [0xde] = {OP_orcc, -1, 0, two, imm1_decode, 0}, [0xdf] = {OP_neg, 3, 0, opr_n_bytes_p1, NULL, z_opr_decode}, [0xe0] = {OP_cmp, -1, 0, three, z_reg, z_imm1234_0base}, [0xe1] = {OP_cmp, -1, 0, three, z_reg, z_imm1234_0base}, [0xe2] = {OP_cmp, -1, 0, three, z_reg, z_imm1234_0base}, [0xe3] = {OP_cmp, -1, 0, three, z_reg, z_imm1234_0base}, [0xe4] = {OP_cmp, -1, 0, two, z_reg, z_imm1234_0base}, [0xe5] = {OP_cmp, -1, 0, two, z_reg, z_imm1234_0base}, [0xe6] = {OP_cmp, -1, 0, five, z_reg, z_imm1234_0base}, [0xe7] = {OP_cmp, -1, 0, five, z_reg, z_imm1234_0base}, [0xe8] = {OP_cmp, -1, 0, four, reg_xy, z_imm1234_0base}, [0xe9] = {OP_cmp, -1, 0, four, reg_xy, z_imm1234_0base}, [0xea] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xeb] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xec] = {OP_bclr, -1, 0, bm_n_bytes, bm_decode, 0}, [0xed] = {OP_bset, -1, 0, bm_n_bytes, bm_decode, 0}, [0xee] = {OP_btgl, -1, 0, bm_n_bytes, bm_decode, 0}, [0xef] = {OP_INVALID, -1, 0, NULL, NULL, NULL}, /* SPARE */ [0xf0] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf1] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf2] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf3] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf4] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf5] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf6] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf7] = {OP_cmp, -1, 0, opr_n_bytes_p1, z_reg, z_opr_decode}, [0xf8] = {OP_cmp, -1, 0, opr_n_bytes_p1, reg_xy, z_opr_decode}, [0xf9] = {OP_cmp, -1, 0, opr_n_bytes_p1, reg_xy, z_opr_decode}, [0xfa] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xfb] = {OP_ld, -1, 0, three, reg_xy, ld_18bit_decode}, [0xfc] = {OP_cmp, -1, 0, single, cmp_xy, 0}, [0xfd] = {OP_sub, -1, 0, single, sub_d6_x_y, 0}, [0xfe] = {OP_sub, -1, 0, single, sub_d6_y_x, 0}, [0xff] = {OP_swi, -1, 0, single, 0, 0} }; static const int oprregs1[] = { REG_D3, REG_D2, REG_D1, REG_D0, REG_CCL, REG_CCH }; static const int oprregs2[] = { REG_Y, REG_X, REG_D7, REG_D6, REG_D5, REG_D4 }; enum MUL_MODE { MUL_REG_REG, MUL_REG_OPR, MUL_REG_IMM, MUL_OPR_OPR }; struct mb { uint8_t mask; uint8_t value; enum MUL_MODE mode; }; static const struct mb mul_table[] = { {0x40, 0x00, MUL_REG_REG}, {0x47, 0x40, MUL_REG_OPR}, {0x47, 0x41, MUL_REG_OPR}, {0x47, 0x43, MUL_REG_OPR}, {0x47, 0x44, MUL_REG_IMM}, {0x47, 0x45, MUL_REG_IMM}, {0x47, 0x47, MUL_REG_IMM}, {0x43, 0x42, MUL_OPR_OPR}, }; static void mul_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { uint8_t mb; int status = mra->read (mra, 0, 1, &mb); if (status < 0) return; uint8_t byte; status = mra->read (mra, -1, 1, &byte); if (status < 0) return; enum MUL_MODE mode = -1; size_t i; for (i = 0; i < sizeof (mul_table) / sizeof (mul_table[0]); ++i) { const struct mb *mm = mul_table + i; if ((mb & mm->mask) == mm->value) { mode = mm->mode; break; } } operand[(*n_operands)++] = create_register_operand (byte & 0x07); switch (mode) { case MUL_REG_IMM: { int size = (mb & 0x3); operand[(*n_operands)++] = create_register_operand_with_size ((mb & 0x38) >> 3, size); uint32_t imm = z_decode_signed_value (mra, 1, size + 1); operand[(*n_operands)++] = create_immediate_operand (imm); } break; case MUL_REG_REG: operand[(*n_operands)++] = create_register_operand ((mb & 0x38) >> 3); operand[(*n_operands)++] = create_register_operand (mb & 0x07); break; case MUL_REG_OPR: operand[(*n_operands)++] = create_register_operand ((mb & 0x38) >> 3); operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, mb & 0x3); break; case MUL_OPR_OPR: { int first = x_opr_n_bytes (mra, 1); operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, (mb & 0x30) >> 4); operand[(*n_operands)++] = x_opr_decode_with_size (mra, first + 1, (mb & 0x0c) >> 2); break; } } } static int mul_n_bytes (struct mem_read_abstraction_base *mra) { int nx = 2; uint8_t mb; int status = mra->read (mra, 0, 1, &mb); if (status < 0) return 0; enum MUL_MODE mode = -1; size_t i; for (i = 0; i < sizeof (mul_table) / sizeof (mul_table[0]); ++i) { const struct mb *mm = mul_table + i; if ((mb & mm->mask) == mm->value) { mode = mm->mode; break; } } int size = (mb & 0x3) + 1; switch (mode) { case MUL_REG_IMM: nx += size; break; case MUL_REG_REG: break; case MUL_REG_OPR: nx += x_opr_n_bytes (mra, 1); break; case MUL_OPR_OPR: { int first = x_opr_n_bytes (mra, nx - 1); nx += first; int second = x_opr_n_bytes (mra, nx - 1); nx += second; } break; } return nx; } /* The NXP documentation is vague about BM_RESERVED0 and BM_RESERVED1, and contains obvious typos. However the Freescale tools and experiments with the chip itself seem to indicate that they behave like BM_REG_IMM and BM_OPR_REG respectively. */ enum BM_MODE { BM_REG_IMM, BM_RESERVED0, BM_OPR_B, BM_OPR_W, BM_OPR_L, BM_OPR_REG, BM_RESERVED1 }; struct bm { uint8_t mask; uint8_t value; enum BM_MODE mode; }; static const struct bm bm_table[] = { { 0xC6, 0x04, BM_REG_IMM}, { 0x84, 0x00, BM_REG_IMM}, { 0x06, 0x06, BM_REG_IMM}, { 0xC6, 0x44, BM_RESERVED0}, // 00 { 0x8F, 0x80, BM_OPR_B}, { 0x8E, 0x82, BM_OPR_W}, { 0x8C, 0x88, BM_OPR_L}, { 0x83, 0x81, BM_OPR_REG}, { 0x87, 0x84, BM_RESERVED1}, }; static void bm_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { uint8_t bm; int status = mra->read (mra, 0, 1, &bm); if (status < 0) return; size_t i; enum BM_MODE mode = -1; for (i = 0; i < sizeof (bm_table) / sizeof (bm_table[0]); ++i) { const struct bm *bme = bm_table + i; if ((bm & bme->mask) == bme->value) { mode = bme->mode; break; } } switch (mode) { case BM_REG_IMM: case BM_RESERVED0: operand[(*n_operands)++] = create_register_operand (bm & 0x07); break; case BM_OPR_B: operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, 0); break; case BM_OPR_W: operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, 1); break; case BM_OPR_L: operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, 3); break; case BM_OPR_REG: case BM_RESERVED1: { uint8_t xb; mra->read (mra, 1, 1, &xb); /* Don't emit a size suffix for register operands */ if ((xb & 0xF8) != 0xB8) operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, (bm & 0x0c) >> 2); else operand[(*n_operands)++] = x_opr_decode (mra, 1); } break; } uint8_t imm = 0; switch (mode) { case BM_REG_IMM: case BM_RESERVED0: imm = (bm & 0x38) >> 3; operand[(*n_operands)++] = create_immediate_operand (imm); break; case BM_OPR_L: imm |= (bm & 0x03) << 3; /* fallthrough */ case BM_OPR_W: imm |= (bm & 0x01) << 3; /* fallthrough */ case BM_OPR_B: imm |= (bm & 0x70) >> 4; operand[(*n_operands)++] = create_immediate_operand (imm); break; case BM_OPR_REG: case BM_RESERVED1: operand[(*n_operands)++] = create_register_operand ((bm & 0x70) >> 4); break; } } static void bm_rel_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { uint8_t bm; int status = mra->read (mra, 0, 1, &bm); if (status < 0) return; size_t i; enum BM_MODE mode = -1; for (i = 0; i < sizeof (bm_table) / sizeof (bm_table[0]); ++i) { const struct bm *bme = bm_table + i; if ((bm & bme->mask) == bme->value) { mode = bme->mode; break; } } int n = 1; switch (mode) { case BM_REG_IMM: case BM_RESERVED0: operand[(*n_operands)++] = create_register_operand (bm & 0x07); break; case BM_OPR_B: operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, 0); n = 1 + x_opr_n_bytes (mra, 1); break; case BM_OPR_W: operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, 1); n = 1 + x_opr_n_bytes (mra, 1); break; case BM_OPR_L: operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, 3); n = 1 + x_opr_n_bytes (mra, 1); break; case BM_OPR_REG: case BM_RESERVED1: { uint8_t xb; mra->read (mra, +1, 1, &xb); /* Don't emit a size suffix for register operands */ if ((xb & 0xF8) != 0xB8) { short os = (bm & 0x0c) >> 2; operand[(*n_operands)++] = x_opr_decode_with_size (mra, 1, os); } else operand[(*n_operands)++] = x_opr_decode (mra, 1); } break; } int imm = 0; switch (mode) { case BM_OPR_L: imm |= (bm & 0x02) << 3; /* fall through */ case BM_OPR_W: imm |= (bm & 0x01) << 3; /* fall through */ case BM_OPR_B: imm |= (bm & 0x70) >> 4; operand[(*n_operands)++] = create_immediate_operand (imm); break; case BM_RESERVED0: imm = (bm & 0x38) >> 3; operand[(*n_operands)++] = create_immediate_operand (imm); break; case BM_REG_IMM: imm = (bm & 0xF8) >> 3; operand[(*n_operands)++] = create_immediate_operand (imm); break; case BM_OPR_REG: case BM_RESERVED1: operand[(*n_operands)++] = create_register_operand ((bm & 0x70) >> 4); n += x_opr_n_bytes (mra, 1); break; } rel_15_7 (mra, n + 1, n_operands, operand); } static int bm_n_bytes (struct mem_read_abstraction_base *mra) { uint8_t bm; int status = mra->read (mra, 0, 1, &bm); if (status < 0) return status; size_t i; enum BM_MODE mode = -1; for (i = 0; i < sizeof (bm_table) / sizeof (bm_table[0]); ++i) { const struct bm *bme = bm_table + i; if ((bm & bme->mask) == bme->value) { mode = bme->mode; break; } } int n = 2; switch (mode) { case BM_REG_IMM: case BM_RESERVED0: break; case BM_OPR_B: case BM_OPR_W: case BM_OPR_L: n += x_opr_n_bytes (mra, 1); break; case BM_OPR_REG: case BM_RESERVED1: n += x_opr_n_bytes (mra, 1); break; } return n; } static int bm_rel_n_bytes (struct mem_read_abstraction_base *mra) { int n = 1 + bm_n_bytes (mra); bfd_byte rb; int status = mra->read (mra, n - 2, 1, &rb); if (status != 0) return status; if (rb & 0x80) n++; return n; } /* shift direction */ enum SB_DIR { SB_LEFT, SB_RIGHT }; enum SB_TYPE { SB_ARITHMETIC, SB_LOGICAL }; enum SB_MODE { SB_REG_REG_N_EFF, SB_REG_REG_N, SB_REG_OPR_EFF, SB_ROT, SB_REG_OPR_OPR, SB_OPR_N }; struct sb { uint8_t mask; uint8_t value; enum SB_MODE mode; }; static const struct sb sb_table[] = { {0x30, 0x00, SB_REG_REG_N_EFF}, {0x30, 0x10, SB_REG_REG_N}, {0x34, 0x20, SB_REG_OPR_EFF}, {0x34, 0x24, SB_ROT}, {0x34, 0x30, SB_REG_OPR_OPR}, {0x34, 0x34, SB_OPR_N}, }; static int shift_n_bytes (struct mem_read_abstraction_base *mra) { bfd_byte sb; int status = mra->read (mra, 0, 1, &sb); if (status != 0) return status; size_t i; enum SB_MODE mode = -1; for (i = 0; i < sizeof (sb_table) / sizeof (sb_table[0]); ++i) { const struct sb *sbe = sb_table + i; if ((sb & sbe->mask) == sbe->value) mode = sbe->mode; } switch (mode) { case SB_REG_REG_N_EFF: return 2; break; case SB_REG_OPR_EFF: case SB_ROT: return 2 + x_opr_n_bytes (mra, 1); break; case SB_REG_OPR_OPR: { int opr1 = x_opr_n_bytes (mra, 1); int opr2 = 0; if ((sb & 0x30) != 0x20) opr2 = x_opr_n_bytes (mra, opr1 + 1); return 2 + opr1 + opr2; } break; default: return 3; } /* not reached */ return -1; } static int mov_imm_opr_n_bytes (struct mem_read_abstraction_base *mra) { bfd_byte byte; int status = mra->read (mra, -1, 1, &byte); if (status < 0) return status; int size = byte - 0x0c + 1; return size + x_opr_n_bytes (mra, size) + 1; } static void mov_imm_opr (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { bfd_byte byte; int status = mra->read (mra, -1, 1, &byte); if (status < 0) return ; int size = byte - 0x0c + 1; uint32_t imm = decode_signed_value (mra, size); operand[(*n_operands)++] = create_immediate_operand (imm); operand[(*n_operands)++] = x_opr_decode (mra, size); } static void ld_18bit_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { size_t size = 3; bfd_byte buffer[3]; int status = mra->read (mra, 0, 2, buffer + 1); if (status < 0) return ; status = mra->read (mra, -1, 1, buffer); if (status < 0) return ; buffer[0] = (buffer[0] & 0x30) >> 4; size_t i; uint32_t imm = 0; for (i = 0; i < size; ++i) { imm |= buffer[i] << (8 * (size - i - 1)); } operand[(*n_operands)++] = create_immediate_operand (imm); } /* Loop Primitives */ enum LP_MODE { LP_REG, LP_XY, LP_OPR }; struct lp { uint8_t mask; uint8_t value; enum LP_MODE mode; }; static const struct lp lp_mode[] = { {0x08, 0x00, LP_REG}, {0x0C, 0x08, LP_XY}, {0x0C, 0x0C, LP_OPR}, }; static int loop_prim_n_bytes (struct mem_read_abstraction_base *mra) { int mx = 0; uint8_t lb; mra->read (mra, mx++, 1, &lb); enum LP_MODE mode = -1; size_t i; for (i = 0; i < sizeof (lp_mode) / sizeof (lp_mode[0]); ++i) { const struct lp *pb = lp_mode + i; if ((lb & pb->mask) == pb->value) { mode = pb->mode; break; } } if (mode == LP_OPR) { mx += x_opr_n_bytes (mra, mx) ; } uint8_t rb; mra->read (mra, mx++, 1, &rb); if (rb & 0x80) mx++; return mx + 1; } static enum optr exg_sex_discrim (struct mem_read_abstraction_base *mra, enum optr hint ATTRIBUTE_UNUSED) { uint8_t eb; int status = mra->read (mra, 0, 1, &eb); enum optr operator = OP_INVALID; if (status < 0) return operator; struct operand *op0 = create_register_operand ((eb & 0xf0) >> 4); struct operand *op1 = create_register_operand (eb & 0xf); int reg0 = ((struct register_operand *) op0)->reg; int reg1 = ((struct register_operand *) op1)->reg; if (reg0 >= 0 && reg0 < S12Z_N_REGISTERS && reg1 >= 0 && reg1 < S12Z_N_REGISTERS) { const struct reg *r0 = registers + reg0; const struct reg *r1 = registers + reg1; operator = r0->bytes < r1->bytes ? OP_sex : OP_exg; } free (op0); free (op1); return operator; } static void exg_sex_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands) { uint8_t eb; int status = mra->read (mra, 0, 1, &eb); if (status < 0) return; /* Ship out the operands. */ operands[(*n_operands)++] = create_register_operand ((eb & 0xf0) >> 4); operands[(*n_operands)++] = create_register_operand (eb & 0xf); } static enum optr loop_primitive_discrim (struct mem_read_abstraction_base *mra, enum optr hint ATTRIBUTE_UNUSED) { uint8_t lb; int status = mra->read (mra, 0, 1, &lb); if (status < 0) return OP_INVALID; enum optr opbase = (lb & 0x80) ? OP_dbNE : OP_tbNE; return opbase + ((lb & 0x70) >> 4); } static void loop_primitive_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands) { int offs = 1; uint8_t lb; int status = mra->read (mra, 0, 1, &lb); if (status < 0) return ; enum LP_MODE mode = -1; size_t i; for (i = 0; i < sizeof (lp_mode) / sizeof (lp_mode[0]); ++i) { const struct lp *pb = lp_mode + i; if ((lb & pb->mask) == pb->value) { mode = pb->mode; break; } } switch (mode) { case LP_REG: operands[(*n_operands)++] = create_register_operand (lb & 0x07); break; case LP_XY: operands[(*n_operands)++] = create_register_operand ((lb & 0x01) + REG_X); break; case LP_OPR: offs += x_opr_n_bytes (mra, 1); operands[(*n_operands)++] = x_opr_decode_with_size (mra, 1, lb & 0x03); break; } rel_15_7 (mra, offs + 1, n_operands, operands); } static enum optr shift_discrim (struct mem_read_abstraction_base *mra, enum optr hint ATTRIBUTE_UNUSED) { size_t i; uint8_t sb; int status = mra->read (mra, 0, 1, &sb); if (status < 0) return OP_INVALID; enum SB_DIR dir = (sb & 0x40) ? SB_LEFT : SB_RIGHT; enum SB_TYPE type = (sb & 0x80) ? SB_ARITHMETIC : SB_LOGICAL; enum SB_MODE mode = -1; for (i = 0; i < sizeof (sb_table) / sizeof (sb_table[0]); ++i) { const struct sb *sbe = sb_table + i; if ((sb & sbe->mask) == sbe->value) mode = sbe->mode; } if (mode == SB_ROT) return (dir == SB_LEFT) ? OP_rol : OP_ror; if (type == SB_LOGICAL) return (dir == SB_LEFT) ? OP_lsl : OP_lsr; return (dir == SB_LEFT) ? OP_asl : OP_asr; } static void shift_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands) { size_t i; uint8_t byte; int status = mra->read (mra, -1, 1, &byte); if (status < 0) return ; uint8_t sb; status = mra->read (mra, 0, 1, &sb); if (status < 0) return ; enum SB_MODE mode = -1; for (i = 0; i < sizeof (sb_table) / sizeof (sb_table[0]); ++i) { const struct sb *sbe = sb_table + i; if ((sb & sbe->mask) == sbe->value) mode = sbe->mode; } short osize = -1; switch (mode) { case SB_REG_OPR_EFF: case SB_ROT: case SB_REG_OPR_OPR: osize = sb & 0x03; break; case SB_OPR_N: { uint8_t xb; mra->read (mra, 1, 1, &xb); /* The size suffix is not printed if the OPR operand refers directly to a register, because the size is implied by the size of that register. */ if ((xb & 0xF8) != 0xB8) osize = sb & 0x03; } break; default: break; }; /* Destination register */ switch (mode) { case SB_REG_REG_N_EFF: case SB_REG_REG_N: operands[(*n_operands)++] = create_register_operand (byte & 0x07); break; case SB_REG_OPR_EFF: case SB_REG_OPR_OPR: operands[(*n_operands)++] = create_register_operand (byte & 0x07); break; case SB_ROT: operands[(*n_operands)++] = x_opr_decode_with_size (mra, 1, osize); break; default: break; } /* Source register */ switch (mode) { case SB_REG_REG_N_EFF: case SB_REG_REG_N: operands[(*n_operands)++] = create_register_operand_with_size (sb & 0x07, osize); break; case SB_REG_OPR_OPR: operands[(*n_operands)++] = x_opr_decode_with_size (mra, 1, osize); break; default: break; } /* 3rd arg */ switch (mode) { case SB_REG_OPR_EFF: case SB_OPR_N: operands[(*n_operands)++] = x_opr_decode_with_size (mra, 1, osize); break; case SB_REG_REG_N: { uint8_t xb; mra->read (mra, 1, 1, &xb); /* This case is slightly unusual. If XB matches the binary pattern 0111XXXX, then instead of interpreting this as a general OPR postbyte in the IMMe4 mode, the XB byte is interpreted in s special way. */ if ((xb & 0xF0) == 0x70) { if (byte & 0x10) { int shift = ((sb & 0x08) >> 3) | ((xb & 0x0f) << 1); operands[(*n_operands)++] = create_immediate_operand (shift); } else { /* This should not happen. */ abort (); } } else { operands[(*n_operands)++] = x_opr_decode (mra, 1); } } break; case SB_REG_OPR_OPR: { uint8_t xb; int n = x_opr_n_bytes (mra, 1); mra->read (mra, 1 + n, 1, &xb); if ((xb & 0xF0) == 0x70) { int imm = xb & 0x0F; imm <<= 1; imm |= (sb & 0x08) >> 3; operands[(*n_operands)++] = create_immediate_operand (imm); } else { operands[(*n_operands)++] = x_opr_decode (mra, 1 + n); } } break; default: break; } switch (mode) { case SB_REG_REG_N_EFF: case SB_REG_OPR_EFF: case SB_OPR_N: { int imm = (sb & 0x08) ? 2 : 1; operands[(*n_operands)++] = create_immediate_operand (imm); } break; default: break; } } static enum optr psh_pul_discrim (struct mem_read_abstraction_base *mra, enum optr hint ATTRIBUTE_UNUSED) { uint8_t byte; int status = mra->read (mra, 0, 1, &byte); if (status != 0) return OP_INVALID; return (byte & 0x80) ? OP_pull: OP_push; } static void psh_pul_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operand) { uint8_t byte; int status = mra->read (mra, 0, 1, &byte); if (status != 0) return; int bit; if (byte & 0x40) { if ((byte & 0x3F) == 0) operand[(*n_operands)++] = create_register_all16_operand (); else for (bit = 5; bit >= 0; --bit) { if (byte & (0x1 << bit)) { operand[(*n_operands)++] = create_register_operand (oprregs2[bit]); } } } else { if ((byte & 0x3F) == 0) operand[(*n_operands)++] = create_register_all_operand (); else for (bit = 5; bit >= 0; --bit) { if (byte & (0x1 << bit)) { operand[(*n_operands)++] = create_register_operand (oprregs1[bit]); } } } } static enum optr bit_field_discrim (struct mem_read_abstraction_base *mra, enum optr hint ATTRIBUTE_UNUSED) { int status; bfd_byte bb; status = mra->read (mra, 0, 1, &bb); if (status != 0) return OP_INVALID; return (bb & 0x80) ? OP_bfins : OP_bfext; } static void bit_field_decode (struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands) { int status; bfd_byte byte2; status = mra->read (mra, -1, 1, &byte2); if (status != 0) return; bfd_byte bb; status = mra->read (mra, 0, 1, &bb); if (status != 0) return; enum BB_MODE mode = -1; size_t i; const struct opr_bb *bbs = 0; for (i = 0; i < sizeof (bb_modes) / sizeof (bb_modes[0]); ++i) { bbs = bb_modes + i; if ((bb & bbs->mask) == bbs->value) { mode = bbs->mode; break; } } int reg1 = byte2 & 0x07; /* First operand */ switch (mode) { case BB_REG_REG_REG: case BB_REG_REG_IMM: case BB_REG_OPR_REG: case BB_REG_OPR_IMM: operands[(*n_operands)++] = create_register_operand (reg1); break; case BB_OPR_REG_REG: operands[(*n_operands)++] = x_opr_decode_with_size (mra, 1, (bb >> 2) & 0x03); break; case BB_OPR_REG_IMM: operands[(*n_operands)++] = x_opr_decode_with_size (mra, 2, (bb >> 2) & 0x03); break; } /* Second operand */ switch (mode) { case BB_REG_REG_REG: case BB_REG_REG_IMM: { int reg_src = (bb >> 2) & 0x07; operands[(*n_operands)++] = create_register_operand (reg_src); } break; case BB_OPR_REG_REG: case BB_OPR_REG_IMM: { int reg_src = (byte2 & 0x07); operands[(*n_operands)++] = create_register_operand (reg_src); } break; case BB_REG_OPR_REG: operands[(*n_operands)++] = x_opr_decode_with_size (mra, 1, (bb >> 2) & 0x03); break; case BB_REG_OPR_IMM: operands[(*n_operands)++] = x_opr_decode_with_size (mra, 2, (bb >> 2) & 0x03); break; } /* Third operand */ switch (mode) { case BB_REG_REG_REG: case BB_OPR_REG_REG: case BB_REG_OPR_REG: { int reg_parm = bb & 0x03; operands[(*n_operands)++] = create_register_operand (reg_parm); } break; case BB_REG_REG_IMM: case BB_OPR_REG_IMM: case BB_REG_OPR_IMM: { bfd_byte i1; mra->read (mra, 1, 1, &i1); int offset = i1 & 0x1f; int width = bb & 0x03; width <<= 3; width |= i1 >> 5; operands[(*n_operands)++] = create_bitfield_operand (width, offset); } break; } } /* Decode the next instruction at MRA, according to OPC. The operation to be performed is returned. The number of operands, will be placed in N_OPERANDS. The operands themselved into OPERANDS. */ static enum optr decode_operation (const struct opcode *opc, struct mem_read_abstraction_base *mra, int *n_operands, struct operand **operands) { enum optr op = opc->operator; if (opc->discriminator) op = opc->discriminator (mra, opc->operator); if (opc->operands) opc->operands (mra, n_operands, operands); if (opc->operands2) opc->operands2 (mra, n_operands, operands); return op; } int decode_s12z (enum optr *myoperator, short *osize, int *n_operands, struct operand **operands, struct mem_read_abstraction_base *mra) { int n_bytes = 0; bfd_byte byte; int status = mra->read (mra, 0, 1, &byte); if (status != 0) return status; mra->advance (mra); const struct opcode *opc = page1 + byte; if (byte == PAGE2_PREBYTE) { /* Opcodes in page2 have an additional byte */ n_bytes++; bfd_byte byte2; mra->read (mra, 0, 1, &byte2); mra->advance (mra); opc = page2 + byte2; } *myoperator = decode_operation (opc, mra, n_operands, operands); *osize = opc->osize; /* Return the number of bytes in the instruction. */ n_bytes += (opc && opc->insn_bytes) ? opc->insn_bytes (mra) : 0; return n_bytes; }