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- /* tc-i386.h -- Header file for tc-i386.c
- Copyright (C) 1989, 92, 93, 94, 95, 1996 Free Software Foundation.
-
- This file is part of GAS, the GNU Assembler.
-
- GAS 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 2, or (at your option)
- any later version.
-
- GAS 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 GAS; see the file COPYING. If not, write to
- the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
- #ifndef TC_I386
- #define TC_I386 1
-
- #ifdef TE_LYNX
- #define TARGET_FORMAT "coff-i386-lynx"
- #endif
-
- #ifdef BFD_ASSEMBLER
- /* This is used to determine relocation types in tc-i386.c. The first
- parameter is the current relocation type, the second one is the desired
- type. The idea is that if the original type is already some kind of PIC
- relocation, we leave it alone, otherwise we give it the desired type */
-
- #define TC_RELOC(X,Y) (((X) != BFD_RELOC_386_PLT32 && \
- (X) != BFD_RELOC_386_GOTOFF && \
- (X) != BFD_RELOC_386_GOT32 && \
- (X) != BFD_RELOC_386_GOTPC) ? Y : X)
-
- #define tc_fix_adjustable(X) tc_i386_fix_adjustable(X)
-
- /* This is the relocation type for direct references to GLOBAL_OFFSET_TABLE.
- * It comes up in complicated expressions such as
- * _GLOBAL_OFFSET_TABLE_+[.-.L284], which cannot be expressed normally with
- * the regular expressions. The fixup specified here when used at runtime
- * implies that we should add the address of the GOT to the specified location,
- * and as a result we have simplified the expression into something we can use.
- */
- #define TC_RELOC_GLOBAL_OFFSET_TABLE BFD_RELOC_386_GOTPC
-
- /* This expression evaluates to false if the relocation is for a local object
- for which we still want to do the relocation at runtime. True if we
- are willing to perform this relocation while building the .o file.
- This is only used for pcrel relocations, so GOTOFF does not need to be
- checked here. I am not sure if some of the others are ever used with
- pcrel, but it is easier to be safe than sorry. */
-
- #define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \
- ((FIX)->fx_r_type != BFD_RELOC_386_PLT32 \
- && (FIX)->fx_r_type != BFD_RELOC_386_GOT32 \
- && (FIX)->fx_r_type != BFD_RELOC_386_GOTPC)
-
- #define TARGET_ARCH bfd_arch_i386
- #define TARGET_BYTES_BIG_ENDIAN 0
-
- #ifdef OBJ_AOUT
- #ifdef TE_NetBSD
- #define TARGET_FORMAT "a.out-i386-netbsd"
- #endif
- #ifdef TE_386BSD
- #define TARGET_FORMAT "a.out-i386-bsd"
- #endif
- #ifdef TE_LINUX
- #define TARGET_FORMAT "a.out-i386-linux"
- #endif
- #ifdef TE_Mach
- #define TARGET_FORMAT "a.out-mach3"
- #endif
- #ifndef TARGET_FORMAT
- #define TARGET_FORMAT "a.out-i386"
- #endif
- #endif /* OBJ_AOUT */
-
- #ifdef OBJ_ELF
- #define TARGET_FORMAT "elf32-i386"
- #endif
-
- #else /* ! BFD_ASSEMBLER */
-
- /* COFF STUFF */
-
- #define COFF_MAGIC I386MAGIC
- #define BFD_ARCH bfd_arch_i386
- #define COFF_FLAGS F_AR32WR
- #define TC_COUNT_RELOC(x) ((x)->fx_addsy || (x)->fx_r_type==7)
- #define TC_FORCE_RELOCATION(x) ((x)->fx_r_type==7)
- #define TC_COFF_FIX2RTYPE(fixP) tc_coff_fix2rtype(fixP)
- extern short tc_coff_fix2rtype ();
- #define TC_COFF_SIZEMACHDEP(frag) tc_coff_sizemachdep(frag)
- extern int tc_coff_sizemachdep PARAMS ((fragS *frag));
- #define SUB_SEGMENT_ALIGN(SEG) 2
- #define TC_RVA_RELOC 7
- /* Need this for PIC relocations */
- #define NEED_FX_R_TYPE
-
-
- #ifdef TE_386BSD
- /* The BSDI linker apparently rejects objects with a machine type of
- M_386 (100). */
- #define AOUT_MACHTYPE 0
- #else
- #define AOUT_MACHTYPE 100
- #endif
-
- #undef REVERSE_SORT_RELOCS
-
- #endif /* ! BFD_ASSEMBLER */
-
- #ifdef BFD_ASSEMBLER
- #define NO_RELOC BFD_RELOC_NONE
- #else
- #define NO_RELOC 0
- #endif
- #define tc_coff_symbol_emit_hook(a) ; /* not used */
-
- #ifndef OBJ_AOUT
- #ifndef TE_PE
- /* Local labels starts with .L */
- #define LOCAL_LABEL(name) (name[0] == '.' \
- && (name[1] == 'L' || name[1] == 'X' || name[1] == '.'))
- #define FAKE_LABEL_NAME ".L0\001"
- #endif
- #endif
- #define LOCAL_LABELS_FB 1
-
- #define tc_aout_pre_write_hook(x) {;} /* not used */
- #define tc_crawl_symbol_chain(a) {;} /* not used */
- #define tc_headers_hook(a) {;} /* not used */
-
- #define MAX_OPERANDS 3 /* max operands per insn */
- #define MAX_PREFIXES 5 /* max prefixes per opcode */
- #define MAX_IMMEDIATE_OPERANDS 2/* max immediates per insn */
- #define MAX_MEMORY_OPERANDS 2 /* max memory ref per insn (lcall uses 2) */
-
- /* we define the syntax here (modulo base,index,scale syntax) */
- #define REGISTER_PREFIX '%'
- #define IMMEDIATE_PREFIX '$'
- #define ABSOLUTE_PREFIX '*'
- #define PREFIX_SEPERATOR '/'
-
- #define TWO_BYTE_OPCODE_ESCAPE 0x0f
- #define NOP_OPCODE (char) 0x90
-
- /* register numbers */
- #define EBP_REG_NUM 5
- #define ESP_REG_NUM 4
-
- /* modrm_byte.regmem for twobyte escape */
- #define ESCAPE_TO_TWO_BYTE_ADDRESSING ESP_REG_NUM
- /* index_base_byte.index for no index register addressing */
- #define NO_INDEX_REGISTER ESP_REG_NUM
- /* index_base_byte.base for no base register addressing */
- #define NO_BASE_REGISTER EBP_REG_NUM
-
- /* these are the att as opcode suffixes, making movl --> mov, for example */
- #define DWORD_OPCODE_SUFFIX 'l'
- #define WORD_OPCODE_SUFFIX 'w'
- #define BYTE_OPCODE_SUFFIX 'b'
-
- /* modrm.mode = REGMEM_FIELD_HAS_REG when a register is in there */
- #define REGMEM_FIELD_HAS_REG 0x3/* always = 0x3 */
- #define REGMEM_FIELD_HAS_MEM (~REGMEM_FIELD_HAS_REG)
-
- #define END_OF_INSN '\0'
-
- /*
- When an operand is read in it is classified by its type. This type includes
- all the possible ways an operand can be used. Thus, '%eax' is both 'register
- # 0' and 'The Accumulator'. In our language this is expressed by OR'ing
- 'Reg32' (any 32 bit register) and 'Acc' (the accumulator).
- Operands are classified so that we can match given operand types with
- the opcode table in i386-opcode.h.
- */
- #define Unknown 0x0
- /* register */
- #define Reg8 0x1 /* 8 bit reg */
- #define Reg16 0x2 /* 16 bit reg */
- #define Reg32 0x4 /* 32 bit reg */
- #define Reg (Reg8|Reg16|Reg32) /* gen'l register */
- #define WordReg (Reg16|Reg32) /* for push/pop operands */
- /* immediate */
- #define Imm8 0x8 /* 8 bit immediate */
- #define Imm8S 0x10 /* 8 bit immediate sign extended */
- #define Imm16 0x20 /* 16 bit immediate */
- #define Imm32 0x40 /* 32 bit immediate */
- #define Imm1 0x80 /* 1 bit immediate */
- #define ImmUnknown Imm32 /* for unknown expressions */
- #define Imm (Imm8|Imm8S|Imm16|Imm32) /* gen'l immediate */
- /* memory */
- #define Disp8 0x200 /* 8 bit displacement (for jumps) */
- #define Disp16 0x400 /* 16 bit displacement */
- #define Disp32 0x800 /* 32 bit displacement */
- #define Disp (Disp8|Disp16|Disp32) /* General displacement */
- #define DispUnknown Disp32 /* for unknown size displacements */
- #define Mem8 0x1000
- #define Mem16 0x2000
- #define Mem32 0x4000
- #define BaseIndex 0x8000
- #define Mem (Disp|Mem8|Mem16|Mem32|BaseIndex) /* General memory */
- #define WordMem (Mem16|Mem32|Disp|BaseIndex)
- #define ByteMem (Mem8|Disp|BaseIndex)
- /* specials */
- #define InOutPortReg 0x10000 /* register to hold in/out port addr = dx */
- #define ShiftCount 0x20000 /* register to hold shift cound = cl */
- #define Control 0x40000 /* Control register */
- #define Debug 0x80000 /* Debug register */
- #define Test 0x100000 /* Test register */
- #define FloatReg 0x200000 /* Float register */
- #define FloatAcc 0x400000 /* Float stack top %st(0) */
- #define SReg2 0x800000 /* 2 bit segment register */
- #define SReg3 0x1000000 /* 3 bit segment register */
- #define Acc 0x2000000 /* Accumulator %al or %ax or %eax */
- #define ImplicitRegister (InOutPortReg|ShiftCount|Acc|FloatAcc)
- #define JumpAbsolute 0x4000000
- #define Abs8 0x08000000
- #define Abs16 0x10000000
- #define Abs32 0x20000000
- #define Abs (Abs8|Abs16|Abs32)
-
- #define Byte (Reg8|Imm8|Imm8S)
- #define Word (Reg16|Imm16)
- #define DWord (Reg32|Imm32)
-
- #define SMALLEST_DISP_TYPE(num) \
- fits_in_signed_byte(num) ? (Disp8|Disp32|Abs8|Abs32) : (Disp32|Abs32)
-
- typedef struct
- {
- /* instruction name sans width suffix ("mov" for movl insns) */
- char *name;
-
- /* how many operands */
- unsigned int operands;
-
- /* base_opcode is the fundamental opcode byte with a optional prefix(es). */
- unsigned int base_opcode;
-
- /* extension_opcode is the 3 bit extension for group <n> insns.
- If this template has no extension opcode (the usual case) use None */
- unsigned char extension_opcode;
- #define None 0xff /* If no extension_opcode is possible. */
-
- /* the bits in opcode_modifier are used to generate the final opcode from
- the base_opcode. These bits also are used to detect alternate forms of
- the same instruction */
- unsigned int opcode_modifier;
-
- /* opcode_modifier bits: */
- #define W 0x1 /* set if operands are words or dwords */
- #define D 0x2 /* D = 0 if Reg --> Regmem; D = 1 if Regmem --> Reg */
- /* direction flag for floating insns: MUST BE 0x400 */
- #define FloatD 0x400
- /* shorthand */
- #define DW (D|W)
- #define ShortForm 0x10 /* register is in low 3 bits of opcode */
- #define ShortFormW 0x20 /* ShortForm and W bit is 0x8 */
- #define Seg2ShortForm 0x40 /* encoding of load segment reg insns */
- #define Seg3ShortForm 0x80 /* fs/gs segment register insns. */
- #define Jump 0x100 /* special case for jump insns. */
- #define JumpInterSegment 0x200 /* special case for intersegment leaps/calls */
- /* 0x400 CANNOT BE USED since it's already used by FloatD above */
- #define DONT_USE 0x400
- #define NoModrm 0x800
- #define Modrm 0x1000
- #define imulKludge 0x2000
- #define JumpByte 0x4000
- #define JumpDword 0x8000
- #define ReverseRegRegmem 0x10000
- #define Data16 0x20000 /* needs data prefix if in 32-bit mode */
- #define Data32 0x40000 /* needs data prefix if in 16-bit mode */
-
- /* (opcode_modifier & COMES_IN_ALL_SIZES) is true if the
- instuction comes in byte, word, and dword sizes and is encoded into
- machine code in the canonical way. */
- #define COMES_IN_ALL_SIZES (W)
-
- /* (opcode_modifier & COMES_IN_BOTH_DIRECTIONS) indicates that the
- source and destination operands can be reversed by setting either
- the D (for integer insns) or the FloatD (for floating insns) bit
- in base_opcode. */
- #define COMES_IN_BOTH_DIRECTIONS (D|FloatD)
-
- /* operand_types[i] describes the type of operand i. This is made
- by OR'ing together all of the possible type masks. (e.g.
- 'operand_types[i] = Reg|Imm' specifies that operand i can be
- either a register or an immediate operand */
- unsigned int operand_types[3];
- }
- template;
-
- /*
- 'templates' is for grouping together 'template' structures for opcodes
- of the same name. This is only used for storing the insns in the grand
- ole hash table of insns.
- The templates themselves start at START and range up to (but not including)
- END.
- */
- typedef struct
- {
- template *start;
- template *end;
- } templates;
-
- /* these are for register name --> number & type hash lookup */
- typedef struct
- {
- char *reg_name;
- unsigned int reg_type;
- unsigned int reg_num;
- }
-
- reg_entry;
-
- typedef struct
- {
- char *seg_name;
- unsigned int seg_prefix;
- }
-
- seg_entry;
-
- /* these are for prefix name --> prefix code hash lookup */
- typedef struct
- {
- char *prefix_name;
- unsigned char prefix_code;
- }
-
- prefix_entry;
-
- /* 386 operand encoding bytes: see 386 book for details of this. */
- typedef struct
- {
- unsigned regmem:3; /* codes register or memory operand */
- unsigned reg:3; /* codes register operand (or extended opcode) */
- unsigned mode:2; /* how to interpret regmem & reg */
- }
-
- modrm_byte;
-
- /* 386 opcode byte to code indirect addressing. */
- typedef struct
- {
- unsigned base:3;
- unsigned index:3;
- unsigned scale:2;
- }
-
- base_index_byte;
-
- /* The name of the global offset table generated by the compiler. Allow
- this to be overridden if need be. */
- #ifndef GLOBAL_OFFSET_TABLE_NAME
- #define GLOBAL_OFFSET_TABLE_NAME "_GLOBAL_OFFSET_TABLE_"
- #endif
-
- #ifdef BFD_ASSEMBLER
- void i386_validate_fix ();
- #define TC_VALIDATE_FIX(FIXP,SEGTYPE,SKIP) i386_validate_fix(FIXP)
- #endif
-
- #endif /* TC_I386 */
-
- #define md_operand(x)
-
- extern const struct relax_type md_relax_table[];
- #define TC_GENERIC_RELAX_TABLE md_relax_table
-
-
- extern int flag_16bit_code;
-
- #define md_do_align(n, fill, len, around) \
- if ((n) && !need_pass_2 \
- && (!(fill) || ((char)*(fill) == (char)0x90 && (len) == 1)) \
- && now_seg != data_section && now_seg != bss_section) \
- { \
- char *p; \
- p = frag_var(rs_align_code, 15, 1, (relax_substateT) 0, \
- (symbolS *) 0, (long) (n), (char *) 0); \
- *p = 0x90; \
- goto around; \
- }
-
- extern void i386_align_code PARAMS ((fragS *, int));
-
- #define HANDLE_ALIGN(fragP) \
- if (fragP->fr_type == rs_align_code) \
- i386_align_code (fragP, (fragP->fr_next->fr_address \
- - fragP->fr_address \
- - fragP->fr_fix));
-
- /* call md_apply_fix3 with segment instead of md_apply_fix */
- #define MD_APPLY_FIX3
-
- void i386_print_statistics PARAMS ((FILE *));
- #define tc_print_statistics i386_print_statistics
-
- #define md_number_to_chars number_to_chars_littleendian
-
- #ifdef SCO_ELF
- #define tc_init_after_args() sco_id ()
- extern void sco_id PARAMS ((void));
- #endif
-
- /* end of tc-i386.h */
-