gdb/gdb/mips-tdep.c

842 /* This returns the PC of the first inst after the prologue.  If we can't
888 mips32_decode_reg_save (t_inst inst, unsigned long *gen_mask,
893   if ((inst & 0xffe00000) == 0xafa00000	/* sw reg,n($sp) */
894       || (inst & 0xffe00000) == 0xafc00000	/* sw reg,n($r30) */
895       || (inst & 0xffe00000) == 0xffa00000)	/* sd reg,n($sp) */
902       reg = (inst & 0x001f0000) >> 16;
905   else if ((inst & 0xffe00000) == 0xe7a00000	/* swc1 freg,n($sp) */
906 	   || (inst & 0xffe00000) == 0xe7c00000	/* swc1 freg,n($r30) */
907 	   || (inst & 0xffe00000) == 0xf7a00000)	/* sdc1 freg,n($sp) */
910       reg = ((inst & 0x001f0000) >> 16);
921 mips16_decode_reg_save (t_inst inst, unsigned long *gen_mask)
923   if ((inst & 0xf800) == 0xd000)	/* sw reg,n($sp) */
925       int reg = mips16_to_32_reg[(inst & 0x700) >> 8];
928   else if ((inst & 0xff00) == 0xf900)	/* sd reg,n($sp) */
930       int reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
933   else if ((inst & 0xff00) == 0x6200	/* sw $ra,n($sp) */
934 	   || (inst & 0xff00) == 0xfa00)	/* sd $ra,n($sp) */
1009 mips32_relative_offset (unsigned long inst)
1012   x = itype_immediate (inst);
1026   unsigned long inst;
1028   inst = mips_fetch_instruction (pc);
1029   if ((inst & 0xe0000000) != 0)	/* Not a special, jump or branch instruction */
1031       if (itype_op (inst) >> 2 == 5)
1034 	  op = (itype_op (inst) & 0x03);
1049       else if (itype_op (inst) == 17 && itype_rs (inst) == 8)
1052 	  int tf = itype_rt (inst) & 0x01;
1053 	  int cnum = itype_rt (inst) >> 2;
1060 	    pc += mips32_relative_offset (inst) + 4;
1071       switch (op = itype_op (inst) & 0x07)	/* extract bits 28,27,26 */
1074 	  op = rtype_funct (inst);
1080 	      pc = read_signed_register (rtype_rs (inst));
1089 	    op = itype_rt (inst);	/* branch condition */
1097 		if (read_signed_register (itype_rs (inst)) < 0)
1098 		  pc += mips32_relative_offset (inst) + 4;
1106 		if (read_signed_register (itype_rs (inst)) >= 0)
1107 		  pc += mips32_relative_offset (inst) + 4;
1121 	    reg = jtype_target (inst) << 2;
1129 	    reg = jtype_target (inst) << 2;
1136 	  if (read_signed_register (itype_rs (inst)) ==
1137 	      read_signed_register (itype_rt (inst)))
1138 	    pc += mips32_relative_offset (inst) + 4;
1144 	  if (read_signed_register (itype_rs (inst)) !=
1145 	      read_signed_register (itype_rt (inst)))
1146 	    pc += mips32_relative_offset (inst) + 4;
1151 	  if (read_signed_register (itype_rs (inst) <= 0))
1152 	    pc += mips32_relative_offset (inst) + 4;
1159 	  if (read_signed_register (itype_rs (inst) > 0))
1160 	    pc += mips32_relative_offset (inst) + 4;
1251 	       unsigned int inst,
1266 	    value |= inst & 0x7ff;	/* eleven bits from instruction */
1270 	    value = inst & 0x7ff;
1288 	    value |= inst & 0xff;	/* eleven bits from instruction */
1298 	    value = inst & 0xff;	/* 8 bits */
1299 	    regx = (inst >> 8) & 0x07;	/* or i8 funct */
1315 	value = ((inst & 0x1f) << 5) | ((inst >> 5) & 0x1f);
1589       ULONGEST inst = mips16_fetch_instruction (PROC_LOW_ADDR (proc_desc));
1590       if ((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700)
1594 	  int sreg_count = (inst >> 6) & 3;
1599 	  if (inst & 0x20)
1922 	unsigned short inst;
1930 	inst = mips_fetch_instruction (start_pc);
1931 	if (((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700)	/* entry */
1932 	    || (inst & 0xff80) == 0x6380	/* addiu sp,-n */
1933 	    || (inst & 0xff80) == 0xfb80	/* daddiu sp,-n */
1934 	    || ((inst & 0xf810) == 0xf010 && seen_adjsp))	/* extend -n */
1936 	else if ((inst & 0xff00) == 0x6300	/* addiu sp */
1937 		 || (inst & 0xff00) == 0xfb00)	/* daddiu sp */
1958 		unsigned short inst,	/* current instruction */
1970       return offset | (inst & 0x1f);
1978       offset = inst & mask;
1996   unsigned inst = 0;		/* current instruction */
2008       prev_inst = inst;
2011       inst = (unsigned short) mips_fetch_instruction (cur_pc);
2012       if ((inst & 0xff00) == 0x6300	/* addiu sp */
2013 	  || (inst & 0xff00) == 0xfb00)	/* daddiu sp */
2015 	  offset = mips16_get_imm (prev_inst, inst, 8, 8, 1);
2024       else if ((inst & 0xf800) == 0xd000)	/* sw reg,n($sp) */
2026 	  offset = mips16_get_imm (prev_inst, inst, 8, 4, 0);
2027 	  reg = mips16_to_32_reg[(inst & 0x700) >> 8];
2031       else if ((inst & 0xff00) == 0xf900)	/* sd reg,n($sp) */
2033 	  offset = mips16_get_imm (prev_inst, inst, 5, 8, 0);
2034 	  reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
2038       else if ((inst & 0xff00) == 0x6200)	/* sw $ra,n($sp) */
2040 	  offset = mips16_get_imm (prev_inst, inst, 8, 4, 0);
2044       else if ((inst & 0xff00) == 0xfa00)	/* sd $ra,n($sp) */
2046 	  offset = mips16_get_imm (prev_inst, inst, 8, 8, 0);
2050       else if (inst == 0x673d)	/* move $s1, $sp */
2055       else if ((inst & 0xff00) == 0x0100)	/* addiu $s1,sp,n */
2057 	  offset = mips16_get_imm (prev_inst, inst, 8, 4, 0);
2062       else if ((inst & 0xFF00) == 0xd900)	/* sw reg,offset($s1) */
2064 	  offset = mips16_get_imm (prev_inst, inst, 5, 4, 0);
2065 	  reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
2069       else if ((inst & 0xFF00) == 0x7900)	/* sd reg,offset($s1) */
2071 	  offset = mips16_get_imm (prev_inst, inst, 5, 8, 0);
2072 	  reg = mips16_to_32_reg[(inst & 0xe0) >> 5];
2076       else if ((inst & 0xf81f) == 0xe809 && (inst & 0x700) != 0x700)	/* entry */
2077 	entry_inst = inst;	/* save for later processing */
2078       else if ((inst & 0xf800) == 0x1800)	/* jal(x) */
2140       unsigned long inst, high_word, low_word;
2144       inst = (unsigned long) mips_fetch_instruction (cur_pc);
2147       high_word = (inst >> 16) & 0xffff;
2148       low_word = inst & 0xffff;
2205       else if (inst == 0x03A0F021 || inst == 0x03a0f025 || inst == 0x03a0f02d)
4580   t_inst inst;
4597       inst = mips_fetch_instruction (pc);
4598       high_word = (inst >> 16) & 0xffff;
4603       else if (inst == 0x03a1e823 ||	/* subu $sp,$sp,$at */
4604 	       inst == 0x03a8e823)	/* subu $sp,$sp,$t0 */
4606       else if (((inst & 0xFFE00000) == 0xAFA00000	/* sw reg,n($sp) */
4607 		|| (inst & 0xFFE00000) == 0xFFA00000)	/* sd reg,n($sp) */
4608 	       && (inst & 0x001F0000))	/* reg != $zero */
4611       else if ((inst & 0xFFE00000) == 0xE7A00000)	/* swc1 freg,n($sp) */
4613       else if ((inst & 0xF3E00000) == 0xA3C00000 && (inst & 0x001F0000))
4620       else if (inst == 0x03A0F021 || inst == 0x03a0f025 || inst == 0x03a0f02d)
4623       else if ((inst & 0xFF9F07FF) == 0x00800021)	/* move reg,$a0-$a3 */
4629       else if (inst == 0x0399e021	/* addu $gp,$gp,$t9 */
4630 	       || inst == 0x033ce021)	/* addu $gp,$t9,$gp */
4681     unsigned short inst;
4733       unsigned short inst;
4736       inst = mips_fetch_instruction (pc);
4742       if ((inst & 0xf800) == 0xf000)	/* extend */
4752 	if ((inst & table[i].mask) == table[i].inst)	/* found, get out */
5132 	      t_inst inst;
5149 		  inst = mips_fetch_instruction (target_pc);
5150 		  if ((inst & 0xffff0000) == 0x3c010000)	/* lui $at */
5151 		    pc = (inst << 16) & 0xffff0000;	/* high word */
5152 		  else if ((inst & 0xffff0000) == 0x24210000)	/* addiu $at */
5153 		    return pc | (inst & 0xffff);	/* low word */