Bryan Ford's changes for 16-bit i386 support, and i386-msdos support.
This commit is contained in:
Ken Raeburn
parent
a43022bd72
commit
c54c7aaca3
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@ -1,3 +1,20 @@
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Mon Feb 6 03:37:00 1995 Ken Raeburn <raeburn@cujo.cygnus.com>
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Changes from Bryan Ford <baford@schirf.cs.utah.edu> for i386
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16-bit and msdos support:
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* config/tc-i386.c (flag_16bit_code): New variable.
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(set_16bit_code_flag): New function.
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(md_pseudo_table): Added entries "code16" and "code32".
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(md_assemble): Ensure that correct data-size prefixes get emitted,
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based on the current mode. Ensure that 32-bit addressing will
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always be done. Move segment-prefix handling code. (Why?) Use
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16-bit jumps for 16-bit code, 32-bit jumps for 32-bit code.
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* config/tc-i386.h (MAX_PREFIXES): Bump to 5.
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(Data16, Data32): Define.
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* doc/as.texinfo (i386-16bit): New node.
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* configure.in (i386-*-msdos*): New target, using a.out format.
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* configure: Regenerated.
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Thu Feb 2 15:21:24 1995 Ken Raeburn <raeburn@cujo.cygnus.com>
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* config/tc-m68k.c (cpu32_control_regs): New macro.
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@ -174,6 +174,8 @@ static int this_operand; /* current operand we are working on */
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static int flag_do_long_jump; /* FIXME what does this do? */
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static int flag_16bit_code; /* 1 if we're writing 16-bit code, 0 if 32-bit */
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/* Interface to relax_segment.
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There are 2 relax states for 386 jump insns: one for conditional &
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one for unconditional jumps. This is because the these two types
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@ -318,6 +320,12 @@ smallest_imm_type (num)
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: (Imm32));
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} /* smallest_imm_type() */
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void set_16bit_code_flag(new_16bit_code_flag)
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int new_16bit_code_flag;
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{
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flag_16bit_code = new_16bit_code_flag;
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}
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const pseudo_typeS md_pseudo_table[] =
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{
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#ifndef I386COFF
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@ -334,6 +342,8 @@ const pseudo_typeS md_pseudo_table[] =
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{"value", cons, 2},
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{"noopt", s_ignore, 0},
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{"optim", s_ignore, 0},
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{"code16", set_16bit_code_flag, 1},
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{"code32", set_16bit_code_flag, 0},
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{0, 0, 0}
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};
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@ -645,24 +655,20 @@ reloc (size, pcrel, other)
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if (pcrel)
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switch (size)
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{
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#ifndef OBJ_ELF
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case 1: return BFD_RELOC_8_PCREL;
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case 2: return BFD_RELOC_16_PCREL;
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#endif
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case 4: return BFD_RELOC_32_PCREL;
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}
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else
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switch (size)
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{
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#ifndef OBJ_ELF
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case 1: return BFD_RELOC_8;
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case 2: return BFD_RELOC_16;
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#endif
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case 4: return BFD_RELOC_32;
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}
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as_bad ("Can not do %d byte %srelocation", size,
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pcrel ? "pc-relative" : "");
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pcrel ? "pc-relative " : "");
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return BFD_RELOC_NONE;
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}
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#else
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@ -684,7 +690,13 @@ tc_i386_fix_adjustable(fixP)
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fixS * fixP;
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{
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/* Prevent all adjustments to global symbols. */
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if(!S_IS_LOCAL(fixP->fx_addsy)) return 0;
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if (!S_IS_LOCAL (fixP->fx_addsy))
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return 0;
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#ifdef BFD_ASSEMBLER
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/* adjust_reloc_syms doesn't know about the GOT */
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if (fixP->fx_r_type == BFD_RELOC_386_GOTOFF)
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return 0;
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#endif
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return 1;
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}
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@ -1032,6 +1044,21 @@ md_assemble (line)
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i.tm = *t;
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t = &i.tm; /* alter new copy of template */
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/* If the matched instruction specifies an explicit opcode suffix,
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use it - and make sure none has already been specified. */
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if (t->opcode_modifier & (Data16|Data32))
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{
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if (i.suffix)
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{
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as_bad ("extraneous opcode suffix given");
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return;
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}
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if (t->opcode_modifier & Data16)
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i.suffix = WORD_OPCODE_SUFFIX;
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else
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i.suffix = DWORD_OPCODE_SUFFIX;
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}
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/* If there's no opcode suffix we try to invent one based on register
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operands. */
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if (!i.suffix && i.reg_operands)
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@ -1115,7 +1142,7 @@ md_assemble (line)
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t->base_opcode |= W;
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/* Now select between word & dword operations via the
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operand size prefix. */
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if (i.suffix == WORD_OPCODE_SUFFIX)
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if ((i.suffix == WORD_OPCODE_SUFFIX) ^ flag_16bit_code)
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{
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if (i.prefixes == MAX_PREFIXES)
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{
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@ -1130,6 +1157,16 @@ md_assemble (line)
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/* For insns with operands there are more diddles to do to the opcode. */
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if (i.operands)
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{
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/* Default segment register this instruction will use
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for memory accesses. 0 means unknown.
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This is only for optimizing out unnecessary segment overrides. */
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const seg_entry *default_seg = 0;
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/* True if this instruction uses a memory addressing mode,
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and therefore may need an address-size prefix. */
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int uses_mem_addrmode = 0;
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/* If we found a reverse match we must alter the opcode direction bit
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found_reverse_match holds bit to set (different for int &
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float insns). */
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@ -1195,6 +1232,14 @@ md_assemble (line)
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if (i.regs[0]->reg_num == 5)
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t->base_opcode |= 0x08;
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}
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else if ((t->base_opcode & ~DW) == MOV_AX_DISP32)
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{
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/* This is a special non-modrm instruction
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that addresses memory with a 32-bit displacement mode anyway,
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and thus requires an address-size prefix if in 16-bit mode. */
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uses_mem_addrmode = 1;
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default_seg = &ds;
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}
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else if (t->opcode_modifier & Modrm)
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{
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/* The opcode is completed (modulo t->extension_opcode which must
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@ -1323,11 +1368,11 @@ md_assemble (line)
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exp->X_op_symbol = (symbolS *) 0;
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}
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/* Select the correct segment for the memory operand. */
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/* Find the default segment for the memory operand.
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Used to optimize out explicit segment specifications. */
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if (i.seg)
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{
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unsigned int seg_index;
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const seg_entry *default_seg;
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if (i.rm.regmem == ESCAPE_TO_TWO_BYTE_ADDRESSING)
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{
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@ -1339,18 +1384,6 @@ md_assemble (line)
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seg_index = (i.rm.mode << 3) | i.rm.regmem;
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default_seg = one_byte_segment_defaults[seg_index];
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}
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/* If the specified segment is not the default, use an
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opcode prefix to select it */
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if (i.seg != default_seg)
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{
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if (i.prefixes == MAX_PREFIXES)
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{
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as_bad ("%d prefixes given and %s segment override gives too many prefixes",
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MAX_PREFIXES, i.seg->seg_name);
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return;
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}
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i.prefix[i.prefixes++] = i.seg->seg_prefix;
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}
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}
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}
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@ -1381,6 +1414,40 @@ md_assemble (line)
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if (t->extension_opcode != None)
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i.rm.reg = t->extension_opcode;
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}
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if (i.rm.mode != 3)
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uses_mem_addrmode = 1;
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}
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/* GAS currently doesn't support 16-bit memory addressing modes at all,
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so if we're writing 16-bit code and using a memory addressing mode,
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always spew out an address size prefix. */
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if (uses_mem_addrmode && flag_16bit_code)
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{
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if (i.prefixes == MAX_PREFIXES)
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{
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as_bad ("%d prefixes given and address size override gives too many prefixes",
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MAX_PREFIXES);
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return;
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}
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i.prefix[i.prefixes++] = ADDR_PREFIX_OPCODE;
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}
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/* If a segment was explicitly specified,
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and the specified segment is not the default,
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use an opcode prefix to select it.
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If we never figured out what the default segment is,
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then default_seg will be zero at this point,
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and the specified segment prefix will always be used. */
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if ((i.seg) && (i.seg != default_seg))
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{
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if (i.prefixes == MAX_PREFIXES)
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{
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as_bad ("%d prefixes given and %s segment override gives too many prefixes",
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MAX_PREFIXES, i.seg->seg_name);
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return;
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}
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i.prefix[i.prefixes++] = i.seg->seg_prefix;
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}
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}
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}
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@ -1410,39 +1477,47 @@ md_assemble (line)
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p[0] = t->base_opcode;
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p[1] = n;
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}
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#if 0 /* leave out 16 bit jumps - pace */
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else if (fits_in_signed_word (n))
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{
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p = frag_more (4);
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insn_size += 4;
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p[0] = WORD_PREFIX_OPCODE;
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p[1] = t->base_opcode;
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md_number_to_chars (&p[2], (valueT) n, 2);
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}
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#endif
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else
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{ /* It's an absolute dword displacement. */
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{ /* It's an absolute word/dword displacement. */
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/* Use only 16-bit jumps for 16-bit code,
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because text segments are limited to 64K anyway;
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use only 32-bit jumps for 32-bit code,
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because they're faster. */
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int jmp_size = flag_16bit_code ? 2 : 4;
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if (flag_16bit_code && !fits_in_signed_word (n))
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{
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as_bad ("16-bit jump out of range");
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return;
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}
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if (t->base_opcode == JUMP_PC_RELATIVE)
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{ /* pace */
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/* unconditional jump */
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p = frag_more (5);
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insn_size += 5;
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p = frag_more (1 + jmp_size);
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insn_size += 1 + jmp_size;
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p[0] = (char) 0xe9;
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md_number_to_chars (&p[1], (valueT) n, 4);
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md_number_to_chars (&p[1], (valueT) n, jmp_size);
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}
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else
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{
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/* conditional jump */
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p = frag_more (6);
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insn_size += 6;
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p = frag_more (2 + jmp_size);
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insn_size += 2 + jmp_size;
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p[0] = TWO_BYTE_OPCODE_ESCAPE;
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p[1] = t->base_opcode + 0x10;
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md_number_to_chars (&p[2], (valueT) n, 4);
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md_number_to_chars (&p[2], (valueT) n, jmp_size);
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}
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}
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}
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else
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{
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if (flag_16bit_code)
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{
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FRAG_APPEND_1_CHAR (WORD_PREFIX_OPCODE);
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insn_size += 1;
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}
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/* It's a symbol; end frag & setup for relax.
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Make sure there are more than 6 chars left in the current frag;
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if not we'll have to start a new one. */
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@ -1468,6 +1543,24 @@ md_assemble (line)
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{
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int size = (t->opcode_modifier & JumpByte) ? 1 : 4;
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unsigned long n = i.disps[0]->X_add_number;
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unsigned char *q;
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/* The jcx/jecx instruction might need a data size prefix. */
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for (q = i.prefix; q < i.prefix + i.prefixes; q++)
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{
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if (*q == WORD_PREFIX_OPCODE)
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{
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FRAG_APPEND_1_CHAR (WORD_PREFIX_OPCODE);
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insn_size += 1;
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break;
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}
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}
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if ((size == 4) && (flag_16bit_code))
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{
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FRAG_APPEND_1_CHAR (WORD_PREFIX_OPCODE);
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insn_size += 1;
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}
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if (fits_in_unsigned_byte (t->base_opcode))
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{
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@ -1503,6 +1596,12 @@ md_assemble (line)
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}
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else if (t->opcode_modifier & JumpInterSegment)
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{
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if (flag_16bit_code)
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{
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FRAG_APPEND_1_CHAR (WORD_PREFIX_OPCODE);
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insn_size += 1;
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}
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p = frag_more (1 + 2 + 4); /* 1 opcode; 2 segment; 4 offset */
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insn_size += 1 + 2 + 4;
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p[0] = t->base_opcode;
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@ -1688,7 +1787,7 @@ md_assemble (line)
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p = frag_more (size);
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insn_size += size;
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#ifdef BFD_ASSEMBLER
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if (r_type = BFD_RELOC_32
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if (r_type == BFD_RELOC_32
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&& i.imms[n]->X_op == O_symbol
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&& GOT_symbol
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&& GOT_symbol == i.imms[n]->X_add_symbol)
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@ -2095,9 +2194,16 @@ i386_operand (operand_string)
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/* We do this to make sure that the section symbol is in
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the symbol table. We will ultimately change the relocation
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to be relative to the beginning of the section */
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if(i.disp_reloc[this_operand] == BFD_RELOC_386_GOTOFF &&
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S_IS_LOCAL(exp->X_add_symbol))
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if (i.disp_reloc[this_operand] == BFD_RELOC_386_GOTOFF)
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{
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if (S_IS_LOCAL(exp->X_add_symbol)
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&& S_GET_SEGMENT (exp->X_add_symbol) != undefined_section)
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section_symbol(exp->X_add_symbol->bsym->section);
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assert (exp->X_op == O_symbol);
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exp->X_op = O_subtract;
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exp->X_op_symbol = GOT_symbol;
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i.disp_reloc[this_operand] = BFD_RELOC_32;
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}
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#endif
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if (*input_line_pointer)
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@ -2426,7 +2532,7 @@ md_apply_fix_1 (fixP, value)
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/* Fix a few things - the dynamic linker expects certain values here,
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and we must not dissappoint it. */
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#ifdef OBJ_ELF
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if(fixP->fx_addsy)
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if (fixP->fx_addsy)
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switch(fixP->fx_r_type) {
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case BFD_RELOC_386_PLT32:
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/* Make the jump instruction point to the address of the operand. At
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@ -2472,13 +2578,14 @@ md_apply_fix_1 (fixP, value)
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* the pcrel_adjust field was used to store the correction, but since the
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* expression is not pcrel, I felt it would be confusing to do it this way.
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*/
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value += fixP->fx_where + fixP->fx_frag->fr_address - fixP->fx_offset;
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value -= 1;
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break;
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case BFD_RELOC_386_GOT32:
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value = 0; /* Fully resolved at runtime. No addend. */
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break;
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case BFD_RELOC_386_GOTOFF:
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/* Here everything should be correct already. Just wanted to mention
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this explicitly so no one things I forgot it. */
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break;
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default:
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break;
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}
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@ -2726,6 +2833,18 @@ s_bss (ignore)
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#ifdef BFD_ASSEMBLER
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void
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i386_validate_fix (fixp)
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fixS *fixp;
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{
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if (fixp->fx_subsy && fixp->fx_subsy == GOT_symbol)
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{
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fixp->fx_r_type = BFD_RELOC_386_GOTOFF;
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fixp->fx_subsy = 0;
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}
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}
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#define F(SZ,PCREL) (((SZ) << 1) + (PCREL))
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#define MAP(SZ,PCREL,TYPE) case F(SZ,PCREL): code = (TYPE); break
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@ -616,6 +616,7 @@ case ${generic_target} in
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i386-*-gnu*elf*) obj_format=elf ;;
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i386-*-mach* | i386-*-gnu*)
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obj_format=aout emulation=mach bfd_gas=yes ;;
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i386-*-msdos*) obj_format=aout ;;
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i960-*-bout) obj_format=bout ;;
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i960-*-coff) obj_format=coff emulation=ic960 gas_target=ic960coff ;;
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@ -922,7 +923,7 @@ else
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# On the NeXT, cc -E runs the code through the compiler's parser,
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# not just through cpp.
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cat > conftest.$ac_ext <<EOF
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#line 926 "configure"
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#line 927 "configure"
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#include "confdefs.h"
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#include <assert.h>
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Syntax Error
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|
@ -936,7 +937,7 @@ else
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rm -rf conftest*
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CPP="${CC-cc} -E -traditional-cpp"
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cat > conftest.$ac_ext <<EOF
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#line 940 "configure"
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#line 941 "configure"
|
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#include "confdefs.h"
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#include <assert.h>
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Syntax Error
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|
@ -967,7 +968,7 @@ if eval "test \"`echo '${'ac_cv_header_$ac_safe'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 971 "configure"
|
||||
#line 972 "configure"
|
||||
#include "confdefs.h"
|
||||
#include <$ac_hdr>
|
||||
EOF
|
||||
|
|
@ -1019,7 +1020,7 @@ else
|
|||
ac_cv_cross=yes
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1023 "configure"
|
||||
#line 1024 "configure"
|
||||
#include "confdefs.h"
|
||||
main(){return(0);}
|
||||
EOF
|
||||
|
|
@ -1042,7 +1043,7 @@ if eval "test \"`echo '${'ac_cv_header_alloca_h'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1046 "configure"
|
||||
#line 1047 "configure"
|
||||
#include "confdefs.h"
|
||||
#include <alloca.h>
|
||||
int main() { return 0; }
|
||||
|
|
@ -1073,7 +1074,7 @@ if eval "test \"`echo '${'ac_cv_func_alloca'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1077 "configure"
|
||||
#line 1078 "configure"
|
||||
#include "confdefs.h"
|
||||
|
||||
#ifdef __GNUC__
|
||||
|
|
@ -1131,7 +1132,7 @@ if eval "test \"`echo '${'ac_cv_os_cray'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1135 "configure"
|
||||
#line 1136 "configure"
|
||||
#include "confdefs.h"
|
||||
#if defined(CRAY) && ! defined(CRAY2)
|
||||
webecray
|
||||
|
|
@ -1158,7 +1159,7 @@ if eval "test \"`echo '${'ac_cv_func__getb67'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1162 "configure"
|
||||
#line 1163 "configure"
|
||||
#include "confdefs.h"
|
||||
#include <ctype.h> /* Arbitrary system header to define __stub macros. */
|
||||
/* Override any gcc2 internal prototype to avoid an error. */
|
||||
|
|
@ -1201,7 +1202,7 @@ if eval "test \"`echo '${'ac_cv_func_GETB67'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1205 "configure"
|
||||
#line 1206 "configure"
|
||||
#include "confdefs.h"
|
||||
#include <ctype.h> /* Arbitrary system header to define __stub macros. */
|
||||
/* Override any gcc2 internal prototype to avoid an error. */
|
||||
|
|
@ -1244,7 +1245,7 @@ if eval "test \"`echo '${'ac_cv_func_getb67'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1248 "configure"
|
||||
#line 1249 "configure"
|
||||
#include "confdefs.h"
|
||||
#include <ctype.h> /* Arbitrary system header to define __stub macros. */
|
||||
/* Override any gcc2 internal prototype to avoid an error. */
|
||||
|
|
@ -1298,7 +1299,7 @@ else
|
|||
ac_cv_c_stack_direction=0
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1302 "configure"
|
||||
#line 1303 "configure"
|
||||
#include "confdefs.h"
|
||||
find_stack_direction ()
|
||||
{
|
||||
|
|
@ -1339,7 +1340,7 @@ if eval "test \"`echo '${'ac_cv_c_inline'+set}'`\" = set"; then
|
|||
else
|
||||
if test "$GCC" = yes; then
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1343 "configure"
|
||||
#line 1344 "configure"
|
||||
#include "confdefs.h"
|
||||
|
||||
int main() { return 0; }
|
||||
|
|
@ -1377,7 +1378,7 @@ if eval "test \"`echo '${'ac_cv_func_$ac_func'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1381 "configure"
|
||||
#line 1382 "configure"
|
||||
#include "confdefs.h"
|
||||
#include <ctype.h> /* Arbitrary system header to define __stub macros. */
|
||||
/* Override any gcc2 internal prototype to avoid an error. */
|
||||
|
|
@ -1428,7 +1429,7 @@ if eval "test \"`echo '${'gas_cv_assert_ok'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1432 "configure"
|
||||
#line 1433 "configure"
|
||||
#include "confdefs.h"
|
||||
#include <assert.h>
|
||||
#include <stdio.h>
|
||||
|
|
@ -1485,7 +1486,7 @@ if eval "test \"`echo '${'gas_cv_decl_needed_malloc'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1489 "configure"
|
||||
#line 1490 "configure"
|
||||
#include "confdefs.h"
|
||||
$gas_test_headers
|
||||
int main() { return 0; }
|
||||
|
|
@ -1521,7 +1522,7 @@ if eval "test \"`echo '${'gas_cv_decl_needed_free'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1525 "configure"
|
||||
#line 1526 "configure"
|
||||
#include "confdefs.h"
|
||||
$gas_test_headers
|
||||
int main() { return 0; }
|
||||
|
|
@ -1560,7 +1561,7 @@ if eval "test \"`echo '${'gas_cv_decl_needed_errno'+set}'`\" = set"; then
|
|||
echo $ac_n "(cached) $ac_c" 1>&4
|
||||
else
|
||||
cat > conftest.$ac_ext <<EOF
|
||||
#line 1564 "configure"
|
||||
#line 1565 "configure"
|
||||
#include "confdefs.h"
|
||||
|
||||
#ifdef HAVE_ERRNO_H
|
||||
|
|
|
|||
|
|
@ -102,8 +102,10 @@ case ${generic_target} in
|
|||
obj_format=coff gas_target=i386coff ;;
|
||||
i386-*-vsta) obj_format=aout ;;
|
||||
i386-*-go32) obj_format=coff gas_target=i386coff ;;
|
||||
i386-*-gnu*elf*) obj_format=elf ;;
|
||||
i386-*-mach* | i386-*-gnu*)
|
||||
obj_format=aout emulation=mach bfd_gas=yes ;;
|
||||
i386-*-msdos*) obj_format=aout ;;
|
||||
|
||||
i960-*-bout) obj_format=bout ;;
|
||||
i960-*-coff) obj_format=coff emulation=ic960 gas_target=ic960coff ;;
|
||||
|
|
@ -186,6 +188,8 @@ case ${generic_target} in
|
|||
z8k-*-coff | z8k-*-sim)
|
||||
obj_format=coff ;;
|
||||
|
||||
w65-*-*) obj_format=coff ;;
|
||||
|
||||
*-*-aout | *-*-scout)
|
||||
obj_format=aout ;;
|
||||
*-*-nindy*)
|
||||
|
|
|
|||
Loading…
Reference in New Issue