GDB 7.6.50

opcodes/msp430-decode.opc

Index: opcodes/msp430-decode.opc
diff --git a/opcodes/msp430-decode.opc b/opcodes/msp430-decode.opc
new file mode 100644
index 0000000000000000000000000000000000000000..1d0f85f3f9b7fc095efdbd4e611568c700d7e6ea
--- /dev/null
+++ b/opcodes/msp430-decode.opc
@@ -0,0 +1,590 @@
+/* -*- 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;
+}