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- /* -*- c -*- */
- /* Copyright (C) 2013-2022 Free Software Foundation, Inc.
- Contributed by Red Hat.
- Written by DJ Delorie.
- 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 <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include "bfd.h"
- #include "opintl.h"
- #include "opcode/msp430-decode.h"
- static int trace = 0;
- typedef struct
- {
- MSP430_Opcode_Decoded *msp430;
- int (*getbyte)(void *);
- void *ptr;
- unsigned char *op;
- int op_ptr;
- int pc;
- } LocalData;
- #define AU ATTRIBUTE_UNUSED
- #define GETBYTE() getbyte_swapped (ld)
- #define B ((unsigned long) GETBYTE ())
- static int
- getbyte_swapped (LocalData *ld)
- {
- int b;
- if (ld->op_ptr == ld->msp430->n_bytes)
- {
- do
- {
- b = ld->getbyte (ld->ptr);
- ld->op [(ld->msp430->n_bytes++)^1] = b;
- }
- while (ld->msp430->n_bytes & 1);
- }
- return ld->op[ld->op_ptr++];
- }
- #define ID(x) msp430->id = x
- #define OP(n, t, r, a) (msp430->op[n].type = t, \
- msp430->op[n].reg = r, \
- msp430->op[n].addend = a)
- #define OPX(n, t, r1, r2, a) \
- (msp430->op[n].type = t, \
- msp430->op[n].reg = r1, \
- msp430->op[n].reg2 = r2, \
- msp430->op[n].addend = a)
- #define SYNTAX(x) msp430->syntax = x
- #define UNSUPPORTED() msp430->syntax = "*unknown*"
- #define DC(c) OP (0, MSP430_Operand_Immediate, 0, c)
- #define DR(r) OP (0, MSP430_Operand_Register, r, 0)
- #define DM(r, a) OP (0, MSP430_Operand_Indirect, r, a)
- #define DA(a) OP (0, MSP430_Operand_Indirect, MSR_None, a)
- #define AD(r, ad) encode_ad (r, ad, ld, 0)
- #define ADX(r, ad, x) encode_ad (r, ad, ld, x)
- #define SC(c) OP (1, MSP430_Operand_Immediate, 0, c)
- #define SR(r) OP (1, MSP430_Operand_Register, r, 0)
- #define SM(r, a) OP (1, MSP430_Operand_Indirect, r, a)
- #define SA(a) OP (1, MSP430_Operand_Indirect, MSR_None, a)
- #define SI(r) OP (1, MSP430_Operand_Indirect_Postinc, r, 0)
- #define AS(r, as) encode_as (r, as, ld, 0)
- #define ASX(r, as, x) encode_as (r, as, ld, x)
- #define BW(x) msp430->size = (x ? 8 : 16)
- /* The last 20 is for SWPBX.Z and SXTX.A. */
- #define ABW(a,x) msp430->size = (a ? ((x ? 8 : 16)) : (x ? 20 : 20))
- #define IMMU(bytes) immediate (bytes, 0, ld)
- #define IMMS(bytes) immediate (bytes, 1, ld)
- /* Helper macros for known status bits settings. */
- #define F_____ msp430->flags_1 = msp430->flags_0 = 0; msp430->flags_set = 0
- #define F_VNZC msp430->flags_1 = msp430->flags_0 = 0; msp430->flags_set = 0x87
- #define F_0NZC msp430->flags_1 = 0; msp430->flags_0 = 0x80; msp430->flags_set = 0x07
- /* The chip is little-endian, but GETBYTE byte-swaps words because the
- decoder is based on 16-bit "words" so *this* logic is big-endian. */
- static int
- immediate (int bytes, int sign_extend, LocalData *ld)
- {
- unsigned long i = 0;
- switch (bytes)
- {
- case 1:
- i |= B;
- if (sign_extend && (i & 0x80))
- i -= 0x100;
- break;
- case 2:
- i |= B << 8;
- i |= B;
- if (sign_extend && (i & 0x8000))
- i -= 0x10000;
- break;
- case 3:
- i |= B << 16;
- i |= B << 8;
- i |= B;
- if (sign_extend && (i & 0x800000))
- i -= 0x1000000;
- break;
- case 4:
- i |= B << 24;
- i |= B << 16;
- i |= B << 8;
- i |= B;
- if (sign_extend && (i & 0x80000000ULL))
- i -= 0x100000000ULL;
- break;
- default:
- opcodes_error_handler
- (_("internal error: immediate() called with invalid byte count %d"),
- bytes);
- abort ();
- }
- return i;
- }
- /*
- PC SP SR CG
- As
- 00 Rn - - R2 #0
- 01 X(Rn) Sym - X(abs) #1
- 10 (Rn) - - #4 #2
- 11 (Rn++) #imm - #8 #-1
- Ad
- 0 Rn - - - -
- 1 X(Rn) Sym - X(abs) - */
- static void
- encode_ad (int reg, int ad, LocalData *ld, int ext)
- {
- MSP430_Opcode_Decoded *msp430 = ld->msp430;
- if (ad)
- {
- int x = IMMU(2) | (ext << 16);
- switch (reg)
- {
- case 0: /* (PC) -> Symbolic. */
- DA (x + ld->pc + ld->op_ptr - 2);
- break;
- case 2: /* (SR) -> Absolute. */
- DA (x);
- break;
- default:
- DM (reg, x);
- break;
- }
- }
- else
- {
- DR (reg);
- }
- }
- static void
- encode_as (int reg, int as, LocalData *ld, int ext)
- {
- MSP430_Opcode_Decoded *msp430 = ld->msp430;
- int x;
- switch (as)
- {
- case 0:
- switch (reg)
- {
- case 3:
- SC (0);
- break;
- default:
- SR (reg);
- break;
- }
- break;
- case 1:
- switch (reg)
- {
- case 0: /* PC -> Symbolic. */
- x = IMMU(2) | (ext << 16);
- SA (x + ld->pc + ld->op_ptr - 2);
- break;
- case 2: /* SR -> Absolute. */
- x = IMMU(2) | (ext << 16);
- SA (x);
- break;
- case 3:
- SC (1);
- break;
- default:
- x = IMMU(2) | (ext << 16);
- SM (reg, x);
- break;
- }
- break;
- case 2:
- switch (reg)
- {
- case 2:
- SC (4);
- break;
- case 3:
- SC (2);
- break;
- case MSR_None:
- SA (0);
- break;
- default:
- SM (reg, 0);
- break;
- }
- break;
- case 3:
- switch (reg)
- {
- case 0:
- {
- /* This fetch *is* the *PC++ that the opcode encodes :-) */
- x = IMMU(2) | (ext << 16);
- SC (x);
- }
- break;
- case 2:
- SC (8);
- break;
- case 3:
- SC (-1);
- break;
- default:
- SI (reg);
- break;
- }
- break;
- }
- }
- static void
- encode_rep_zc (int srxt, int dsxt, LocalData *ld)
- {
- MSP430_Opcode_Decoded *msp430 = ld->msp430;
- msp430->repeat_reg = srxt & 1;
- msp430->repeats = dsxt;
- msp430->zc = (srxt & 2) ? 1 : 0;
- }
- #define REPZC(s,d) encode_rep_zc (s, d, ld)
- static int
- dopc_to_id (int dopc)
- {
- switch (dopc)
- {
- case 4: return MSO_mov;
- case 5: return MSO_add;
- case 6: return MSO_addc;
- case 7: return MSO_subc;
- case 8: return MSO_sub;
- case 9: return MSO_cmp;
- case 10: return MSO_dadd;
- case 11: return MSO_bit;
- case 12: return MSO_bic;
- case 13: return MSO_bis;
- case 14: return MSO_xor;
- case 15: return MSO_and;
- default: return MSO_unknown;
- }
- }
- static int
- sopc_to_id (int sop, int c)
- {
- switch (sop * 2 + c)
- {
- case 0: return MSO_rrc;
- case 1: return MSO_swpb;
- case 2: return MSO_rra;
- case 3: return MSO_sxt;
- case 4: return MSO_push;
- case 5: return MSO_call;
- case 6: return MSO_reti;
- default: return MSO_unknown;
- }
- }
- int
- msp430_decode_opcode (unsigned long pc,
- MSP430_Opcode_Decoded *msp430,
- int (*getbyte)(void *),
- void *ptr)
- {
- LocalData lds, *ld = &lds;
- unsigned char op_buf[20] = {0};
- unsigned char *op = op_buf;
- int raddr;
- int al_bit;
- int srxt_bits, dsxt_bits;
- lds.msp430 = msp430;
- lds.getbyte = getbyte;
- lds.ptr = ptr;
- lds.op = op;
- lds.op_ptr = 0;
- lds.pc = pc;
- memset (msp430, 0, sizeof (*msp430));
- /* These are overridden by an extension word. */
- al_bit = 1;
- srxt_bits = 0;
- dsxt_bits = 0;
- post_extension_word:
- ;
- /* 430X extention word. */
- /** 0001 1srx t l 00 dsxt 430x */
- al_bit = l;
- srxt_bits = srx * 2 + t;
- dsxt_bits = dsxt;
- op = op_buf + lds.op_ptr;
- msp430->ofs_430x = 1;
- goto post_extension_word;
- /* double-op insns:
- opcode:4 sreg:4 Ad:1 BW:1 As:2 Dreg:4
- single-op insn:
- opcode:9 BW:1 Ad:2 DSreg:4
- jumps:
- opcode:3 Cond:3 pcrel:10. */
- /* Double-Operand "opcode" fields. */
- /** VARY dopc 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 */
- /** dopc sreg a b as dreg %D%b %1,%0 */
- ID (dopc_to_id (dopc)); ASX (sreg, as, srxt_bits); ADX (dreg, a, dsxt_bits); ABW (al_bit, b);
- if (a == 0 && as == 0)
- REPZC (srxt_bits, dsxt_bits);
- switch (msp430->id)
- {
- case MSO_mov: F_____; break;
- case MSO_add: F_VNZC; break;
- case MSO_addc: F_VNZC; break;
- case MSO_subc: F_VNZC; break;
- case MSO_sub: F_VNZC; break;
- case MSO_cmp: F_VNZC; break;
- case MSO_dadd: F_VNZC; break;
- case MSO_bit: F_0NZC; break;
- case MSO_bic: F_____; break;
- case MSO_bis: F_____; break;
- case MSO_xor: F_VNZC; break;
- case MSO_and: F_0NZC; break;
- default: break;
- }
- /** 0001 00so c b ad dreg %S%b %1 */
- ID (sopc_to_id (so,c)); ASX (dreg, ad, srxt_bits); ABW (al_bit, b);
- if (ad == 0)
- REPZC (srxt_bits, dsxt_bits);
- /* The helper functions encode for source, but it's
- both source and dest, with a few documented exceptions. */
- msp430->op[0] = msp430->op[1];
- /* RETI ignores the operand. */
- if (msp430->id == MSO_reti)
- msp430->syntax = "%S";
- switch (msp430->id)
- {
- case MSO_rrc: F_VNZC; break;
- case MSO_swpb: F_____; break;
- case MSO_rra: F_0NZC; break;
- case MSO_sxt: F_0NZC; break;
- case MSO_push: F_____; break;
- case MSO_call: F_____; break;
- case MSO_reti: F_VNZC; break;
- default: break;
- }
- /* 20xx 0010 0000 ---- ----
- 3cxx 0011 1100 ---- ----
- 001j mp-- ---- ----. */
- /** 001jmp aa addrlsbs %J %1 */
- raddr = (aa << 9) | (addrlsbs << 1);
- if (raddr & 0x400)
- raddr = raddr - 0x800;
- /* This is a pc-relative jump, but we don't use SM because that
- would load the target address from the memory at X(PC), not use
- PC+X *as* the address. So we use SC to use the address, not the
- data at that address. */
- ID (MSO_jmp); SC (pc + raddr + msp430->n_bytes);
- msp430->cond = jmp;
- /* Extended instructions. */
- /** 0000 srcr 0000 dstr MOVA @%1, %0 */
- ID (MSO_mov); SM (srcr, 0); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 0001 dstr MOVA @%1+, %0 */
- ID (MSO_mov); SI (srcr); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 0010 dstr MOVA &%1, %0 */
- ID (MSO_mov); SA ((srcr << 16) + IMMU(2)); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 0011 dstr MOVA %1, %0 */
- ID (MSO_mov); SM (srcr, IMMS(2)); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 0110 dstr MOVA %1, &%0 */
- ID (MSO_mov); SR (srcr); DA ((dstr << 16) + IMMU(2));
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 0111 dstr MOVA %1, &%0 */
- ID (MSO_mov); SR (srcr); DM (dstr, IMMS(2));
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 1000 dstr MOVA %1, %0 */
- ID (MSO_mov); SC ((srcr << 16) + IMMU(2)); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 1001 dstr CMPA %1, %0 */
- ID (MSO_cmp); SC ((srcr << 16) + IMMU(2)); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- F_VNZC;
- /** 0000 srcr 1010 dstr ADDA %1, %0 */
- ID (MSO_add); SC ((srcr << 16) + IMMU(2)); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- F_VNZC;
- /** 0000 srcr 1011 dstr SUBA %1, %0 */
- ID (MSO_sub); SC ((srcr << 16) + IMMU(2)); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- F_VNZC;
- /** 0000 srcr 1011 dstr SUBA %1, %0 */
- ID (MSO_sub); SC ((srcr << 16) + IMMU(2)); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- F_VNZC;
- /** 0000 srcr 1100 dstr MOVA %1, %0 */
- ID (MSO_mov); SR (srcr); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0000 srcr 1101 dstr CMPA %1, %0 */
- ID (MSO_cmp); SR (srcr); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- F_VNZC;
- /** 0000 srcr 1110 dstr ADDA %1, %0 */
- ID (MSO_add); SR (srcr); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- F_VNZC;
- /** 0000 srcr 1111 dstr SUBA %1, %0 */
- ID (MSO_sub); SR (srcr); DR (dstr);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- F_VNZC;
- /** 0000 bt00 010w dstr RRCM.A %c, %0 */
- ID (MSO_rrc); DR (dstr); SR (dstr);
- msp430->repeats = bt;
- msp430->size = w ? 16 : 20;
- msp430->ofs_430x = 1;
- F_0NZC;
- /** 0000 bt01 010w dstr RRAM.A %c, %0 */
- ID (MSO_rra); DR (dstr); SR (dstr);
- msp430->repeats = bt;
- msp430->size = w ? 16 : 20;
- msp430->ofs_430x = 1;
- F_0NZC;
- /** 0000 bt10 010w dstr RLAM.A %c, %0 */
- ID (MSO_add); DR (dstr); SR (dstr);
- msp430->repeats = bt;
- msp430->size = w ? 16 : 20;
- msp430->ofs_430x = 1;
- F_0NZC;
- /** 0000 bt11 010w dstr RRUM.A %c, %0 */
- ID (MSO_rru); DR (dstr); SR (dstr);
- msp430->repeats = bt;
- msp430->size = w ? 16 : 20;
- msp430->ofs_430x = 1;
- F_0NZC;
- /** 0001 0011 0000 0000 RETI */
- ID (MSO_reti);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0001 0011 01as dstr CALLA %0 */
- ID (MSO_call); AS (dstr, as);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0001 0011 1000 extb CALLA %0 */
- ID (MSO_call); SA (IMMU(2) | (extb << 16));
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0001 0011 1001 extb CALLA %0 */
- raddr = IMMU(2) | (extb << 16);
- if (raddr & 0x80000)
- raddr -= 0x100000;
- ID (MSO_call); SA (pc + raddr + msp430->n_bytes);
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0001 0011 1011 extb CALLA %0 */
- ID (MSO_call); SC (IMMU(2) | (extb << 16));
- msp430->size = 20;
- msp430->ofs_430x = 1;
- /** 0001 010w bits srcr PUSHM.A %0 */
- ID (MSO_push); SR (srcr);
- msp430->size = w ? 16 : 20;
- msp430->repeats = bits;
- msp430->ofs_430x = 1;
- /** 0001 011w bits dstr POPM.A %0 */
- ID (MSO_pop); DR (dstr);
- msp430->size = w ? 16 : 20;
- msp430->repeats = bits;
- msp430->ofs_430x = 1;
- /** */
- return msp430->n_bytes;
- }
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