/* Disassemble moxie instructions. Copyright (c) 2009 Free Software Foundation, Inc. This program 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 2 of the License, or (at your option) any later version. This program 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, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #define STATIC_TABLE #define DEFINE_TABLE #include "disas/bfd.h" static void *stream; /* Form 1 instructions come in different flavors: Some have no arguments (MOXIE_F1_NARG) Some only use the A operand (MOXIE_F1_A) Some use A and B registers (MOXIE_F1_AB) Some use A and consume a 4 byte immediate value (MOXIE_F1_A4) Some use just a 4 byte immediate value (MOXIE_F1_4) Some use just a 4 byte memory address (MOXIE_F1_M) Some use B and an indirect A (MOXIE_F1_AiB) Some use A and an indirect B (MOXIE_F1_ABi) Some consume a 4 byte immediate value and use X (MOXIE_F1_4A) Some use B and an indirect A plus 4 bytes (MOXIE_F1_AiB4) Some use A and an indirect B plus 4 bytes (MOXIE_F1_ABi4) Form 2 instructions also come in different flavors: Some have no arguments (MOXIE_F2_NARG) Some use the A register and an 8-bit value (MOXIE_F2_A8V) Form 3 instructions also come in different flavors: Some have no arguments (MOXIE_F3_NARG) Some have a 10-bit PC relative operand (MOXIE_F3_PCREL). */ #define MOXIE_F1_NARG 0x100 #define MOXIE_F1_A 0x101 #define MOXIE_F1_AB 0x102 /* #define MOXIE_F1_ABC 0x103 */ #define MOXIE_F1_A4 0x104 #define MOXIE_F1_4 0x105 #define MOXIE_F1_AiB 0x106 #define MOXIE_F1_ABi 0x107 #define MOXIE_F1_4A 0x108 #define MOXIE_F1_AiB4 0x109 #define MOXIE_F1_ABi4 0x10a #define MOXIE_F1_M 0x10b #define MOXIE_F2_NARG 0x200 #define MOXIE_F2_A8V 0x201 #define MOXIE_F3_NARG 0x300 #define MOXIE_F3_PCREL 0x301 typedef struct moxie_opc_info_t { short opcode; unsigned itype; const char * name; } moxie_opc_info_t; extern const moxie_opc_info_t moxie_form1_opc_info[64]; extern const moxie_opc_info_t moxie_form2_opc_info[4]; extern const moxie_opc_info_t moxie_form3_opc_info[16]; /* The moxie processor's 16-bit instructions come in two forms: FORM 1 instructions start with a 0 bit... 0oooooooaaaabbbb 0 F ooooooo - form 1 opcode number aaaa - operand A bbbb - operand B FORM 2 instructions start with bits "10"... 10ooaaaavvvvvvvv 0 F oo - form 2 opcode number aaaa - operand A vvvvvvvv - 8-bit immediate value FORM 3 instructions start with a bits "11"... 11oooovvvvvvvvvv 0 F oooo - form 3 opcode number vvvvvvvvvv - 10-bit immediate value. */ const moxie_opc_info_t moxie_form1_opc_info[64] = { { 0x00, MOXIE_F1_NARG, "nop" }, { 0x01, MOXIE_F1_A4, "ldi.l" }, { 0x02, MOXIE_F1_AB, "mov" }, { 0x03, MOXIE_F1_M, "jsra" }, { 0x04, MOXIE_F1_NARG, "ret" }, { 0x05, MOXIE_F1_AB, "add.l" }, { 0x06, MOXIE_F1_AB, "push" }, { 0x07, MOXIE_F1_AB, "pop" }, { 0x08, MOXIE_F1_A4, "lda.l" }, { 0x09, MOXIE_F1_4A, "sta.l" }, { 0x0a, MOXIE_F1_ABi, "ld.l" }, { 0x0b, MOXIE_F1_AiB, "st.l" }, { 0x0c, MOXIE_F1_ABi4, "ldo.l" }, { 0x0d, MOXIE_F1_AiB4, "sto.l" }, { 0x0e, MOXIE_F1_AB, "cmp" }, { 0x0f, MOXIE_F1_NARG, "bad" }, { 0x10, MOXIE_F1_NARG, "bad" }, { 0x11, MOXIE_F1_NARG, "bad" }, { 0x12, MOXIE_F1_NARG, "bad" }, { 0x13, MOXIE_F1_NARG, "bad" }, { 0x14, MOXIE_F1_NARG, "bad" }, { 0x15, MOXIE_F1_NARG, "bad" }, { 0x16, MOXIE_F1_NARG, "bad" }, { 0x17, MOXIE_F1_NARG, "bad" }, { 0x18, MOXIE_F1_NARG, "bad" }, { 0x19, MOXIE_F1_A, "jsr" }, { 0x1a, MOXIE_F1_M, "jmpa" }, { 0x1b, MOXIE_F1_A4, "ldi.b" }, { 0x1c, MOXIE_F1_ABi, "ld.b" }, { 0x1d, MOXIE_F1_A4, "lda.b" }, { 0x1e, MOXIE_F1_AiB, "st.b" }, { 0x1f, MOXIE_F1_4A, "sta.b" }, { 0x20, MOXIE_F1_A4, "ldi.s" }, { 0x21, MOXIE_F1_ABi, "ld.s" }, { 0x22, MOXIE_F1_A4, "lda.s" }, { 0x23, MOXIE_F1_AiB, "st.s" }, { 0x24, MOXIE_F1_4A, "sta.s" }, { 0x25, MOXIE_F1_A, "jmp" }, { 0x26, MOXIE_F1_AB, "and" }, { 0x27, MOXIE_F1_AB, "lshr" }, { 0x28, MOXIE_F1_AB, "ashl" }, { 0x29, MOXIE_F1_AB, "sub.l" }, { 0x2a, MOXIE_F1_AB, "neg" }, { 0x2b, MOXIE_F1_AB, "or" }, { 0x2c, MOXIE_F1_AB, "not" }, { 0x2d, MOXIE_F1_AB, "ashr" }, { 0x2e, MOXIE_F1_AB, "xor" }, { 0x2f, MOXIE_F1_AB, "mul.l" }, { 0x30, MOXIE_F1_4, "swi" }, { 0x31, MOXIE_F1_AB, "div.l" }, { 0x32, MOXIE_F1_AB, "udiv.l" }, { 0x33, MOXIE_F1_AB, "mod.l" }, { 0x34, MOXIE_F1_AB, "umod.l" }, { 0x35, MOXIE_F1_NARG, "brk" }, { 0x36, MOXIE_F1_ABi4, "ldo.b" }, { 0x37, MOXIE_F1_AiB4, "sto.b" }, { 0x38, MOXIE_F1_ABi4, "ldo.s" }, { 0x39, MOXIE_F1_AiB4, "sto.s" }, { 0x3a, MOXIE_F1_NARG, "bad" }, { 0x3b, MOXIE_F1_NARG, "bad" }, { 0x3c, MOXIE_F1_NARG, "bad" }, { 0x3d, MOXIE_F1_NARG, "bad" }, { 0x3e, MOXIE_F1_NARG, "bad" }, { 0x3f, MOXIE_F1_NARG, "bad" } }; const moxie_opc_info_t moxie_form2_opc_info[4] = { { 0x00, MOXIE_F2_A8V, "inc" }, { 0x01, MOXIE_F2_A8V, "dec" }, { 0x02, MOXIE_F2_A8V, "gsr" }, { 0x03, MOXIE_F2_A8V, "ssr" } }; const moxie_opc_info_t moxie_form3_opc_info[16] = { { 0x00, MOXIE_F3_PCREL,"beq" }, { 0x01, MOXIE_F3_PCREL,"bne" }, { 0x02, MOXIE_F3_PCREL,"blt" }, { 0x03, MOXIE_F3_PCREL,"bgt" }, { 0x04, MOXIE_F3_PCREL,"bltu" }, { 0x05, MOXIE_F3_PCREL,"bgtu" }, { 0x06, MOXIE_F3_PCREL,"bge" }, { 0x07, MOXIE_F3_PCREL,"ble" }, { 0x08, MOXIE_F3_PCREL,"bgeu" }, { 0x09, MOXIE_F3_PCREL,"bleu" }, { 0x0a, MOXIE_F3_NARG, "bad" }, { 0x0b, MOXIE_F3_NARG, "bad" }, { 0x0c, MOXIE_F3_NARG, "bad" }, { 0x0d, MOXIE_F3_NARG, "bad" }, { 0x0e, MOXIE_F3_NARG, "bad" }, { 0x0f, MOXIE_F3_NARG, "bad" } }; /* Macros to extract operands from the instruction word. */ #define OP_A(i) ((i >> 4) & 0xf) #define OP_B(i) (i & 0xf) #define INST2OFFSET(o) ((((signed short)((o & ((1<<10)-1))<<6))>>6)<<1) static const char * reg_names[16] = { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5", "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" }; int print_insn_moxie(bfd_vma addr, struct disassemble_info * info) { int length = 2; int status; stream = info->stream; const moxie_opc_info_t * opcode; bfd_byte buffer[4]; unsigned short iword; fprintf_function fpr = info->fprintf_func; if ((status = info->read_memory_func(addr, buffer, 2, info))) goto fail; iword = (bfd_getb16(buffer) >> 16); /* Form 1 instructions have the high bit set to 0. */ if ((iword & (1<<15)) == 0) { /* Extract the Form 1 opcode. */ opcode = &moxie_form1_opc_info[iword >> 8]; switch (opcode->itype) { case MOXIE_F1_NARG: fpr(stream, "%s", opcode->name); break; case MOXIE_F1_A: fpr(stream, "%s\t%s", opcode->name, reg_names[OP_A(iword)]); break; case MOXIE_F1_AB: fpr(stream, "%s\t%s, %s", opcode->name, reg_names[OP_A(iword)], reg_names[OP_B(iword)]); break; case MOXIE_F1_A4: { unsigned imm; if ((status = info->read_memory_func(addr + 2, buffer, 4, info))) goto fail; imm = bfd_getb32(buffer); fpr(stream, "%s\t%s, 0x%x", opcode->name, reg_names[OP_A(iword)], imm); length = 6; } break; case MOXIE_F1_4: { unsigned imm; if ((status = info->read_memory_func(addr + 2, buffer, 4, info))) goto fail; imm = bfd_getb32(buffer); fpr(stream, "%s\t0x%x", opcode->name, imm); length = 6; } break; case MOXIE_F1_M: { unsigned imm; if ((status = info->read_memory_func(addr + 2, buffer, 4, info))) goto fail; imm = bfd_getb32(buffer); fpr(stream, "%s\t", opcode->name); info->print_address_func((bfd_vma) imm, info); length = 6; } break; case MOXIE_F1_AiB: fpr (stream, "%s\t(%s), %s", opcode->name, reg_names[OP_A(iword)], reg_names[OP_B(iword)]); break; case MOXIE_F1_ABi: fpr(stream, "%s\t%s, (%s)", opcode->name, reg_names[OP_A(iword)], reg_names[OP_B(iword)]); break; case MOXIE_F1_4A: { unsigned imm; if ((status = info->read_memory_func(addr + 2, buffer, 4, info))) goto fail; imm = bfd_getb32(buffer); fpr(stream, "%s\t0x%x, %s", opcode->name, imm, reg_names[OP_A(iword)]); length = 6; } break; case MOXIE_F1_AiB4: { unsigned imm; if ((status = info->read_memory_func(addr+2, buffer, 4, info))) goto fail; imm = bfd_getb32(buffer); fpr(stream, "%s\t0x%x(%s), %s", opcode->name, imm, reg_names[OP_A(iword)], reg_names[OP_B(iword)]); length = 6; } break; case MOXIE_F1_ABi4: { unsigned imm; if ((status = info->read_memory_func(addr+2, buffer, 4, info))) goto fail; imm = bfd_getb32(buffer); fpr(stream, "%s\t%s, 0x%x(%s)", opcode->name, reg_names[OP_A(iword)], imm, reg_names[OP_B(iword)]); length = 6; } break; default: abort(); } } else if ((iword & (1<<14)) == 0) { /* Extract the Form 2 opcode. */ opcode = &moxie_form2_opc_info[(iword >> 12) & 3]; switch (opcode->itype) { case MOXIE_F2_A8V: fpr(stream, "%s\t%s, 0x%x", opcode->name, reg_names[(iword >> 8) & 0xf], iword & ((1 << 8) - 1)); break; case MOXIE_F2_NARG: fpr(stream, "%s", opcode->name); break; default: abort(); } } else { /* Extract the Form 3 opcode. */ opcode = &moxie_form3_opc_info[(iword >> 10) & 15]; switch (opcode->itype) { case MOXIE_F3_PCREL: fpr(stream, "%s\t", opcode->name); info->print_address_func((bfd_vma) (addr + INST2OFFSET(iword) + 2), info); break; default: abort(); } } return length; fail: info->memory_error_func(status, addr, info); return -1; }