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-rw-r--r--opcodes/msp430-decode.opc590
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diff --git a/opcodes/msp430-decode.opc b/opcodes/msp430-decode.opc
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+/* -*- c -*- */
+/* Copyright 2013 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 "ansidecl.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:
+ fprintf (stderr,
+ "Programmer error: immediate() called with invalid byte count %d\n",
+ 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);
+ 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;
+}
generated by cgit v1.1 at 2024-11-30 16:48:13 +0000