1 /* nasm.h main header file for the Netwide Assembler: inter-module interface
3 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
4 * Julian Hall. All rights reserved. The software is
5 * redistributable under the licence given in the file "Licence"
6 * distributed in the NASM archive.
8 * initial version: 27/iii/95 by Simon Tatham
18 #include "version.h" /* generated NASM version macros */
20 #include "insnsi.h" /* For enum opcode */
22 #define NO_SEG -1L /* null segment value */
23 #define SEG_ABS 0x40000000L /* mask for far-absolute segments */
26 #define FILENAME_MAX 256
34 #define POSTFIX_MAX 10
37 #define IDLEN_MAX 4096
40 * Name pollution problems: <time.h> on Digital UNIX pulls in some
41 * strange hardware header file which sees fit to define R_SP. We
42 * undefine it here so as not to break the enum below.
49 * We must declare the existence of this structure type up here,
50 * since we have to reference it before we define it...
55 * values for the `type' parameter to an output function.
57 * Exceptions are OUT_RELxADR, which denote an x-byte relocation
58 * which will be a relative jump. For this we need to know the
59 * distance in bytes from the start of the relocated record until
60 * the end of the containing instruction. _This_ is what is stored
61 * in the size part of the parameter, in this case.
63 * Also OUT_RESERVE denotes reservation of N bytes of BSS space,
64 * and the contents of the "data" parameter is irrelevant.
66 * The "data" parameter for the output function points to a "int32_t",
67 * containing the address in question, unless the type is
68 * OUT_RAWDATA, in which case it points to an "uint8_t"
72 OUT_RAWDATA, /* Plain bytes */
73 OUT_ADDRESS, /* An address (symbol value) */
74 OUT_RESERVE, /* Reserved bytes (RESB et al) */
75 OUT_REL2ADR, /* 2-byte relative address */
76 OUT_REL4ADR, /* 4-byte relative address */
77 OUT_REL8ADR, /* 8-byte relative address */
81 * -----------------------
82 * Other function typedefs
83 * -----------------------
87 * A label-lookup function should look like this.
89 typedef bool (*lfunc) (char *label, int32_t *segment, int64_t *offset);
92 * And a label-definition function like this. The boolean parameter
93 * `is_norm' states whether the label is a `normal' label (which
94 * should affect the local-label system), or something odder like
95 * an EQU or a segment-base symbol, which shouldn't.
97 typedef void (*ldfunc) (char *label, int32_t segment, int64_t offset,
98 char *special, bool is_norm, bool isextrn,
99 struct ofmt * ofmt, efunc error);
102 * List-file generators should look like this:
106 * Called to initialize the listing file generator. Before this
107 * is called, the other routines will silently do nothing when
108 * called. The `char *' parameter is the file name to write the
111 void (*init) (char *, efunc);
114 * Called to clear stuff up and close the listing file.
116 void (*cleanup) (void);
119 * Called to output binary data. Parameters are: the offset;
120 * the data; the data type. Data types are similar to the
121 * output-format interface, only OUT_ADDRESS will _always_ be
122 * displayed as if it's relocatable, so ensure that any non-
123 * relocatable address has been converted to OUT_RAWDATA by
124 * then. Note that OUT_RAWDATA,0 is a valid data type, and is a
125 * dummy call used to give the listing generator an offset to
126 * work with when doing things like uplevel(LIST_TIMES) or
127 * uplevel(LIST_INCBIN).
129 void (*output) (int32_t, const void *, enum out_type, uint64_t);
132 * Called to send a text line to the listing generator. The
133 * `int' parameter is LIST_READ or LIST_MACRO depending on
134 * whether the line came directly from an input file or is the
135 * result of a multi-line macro expansion.
137 void (*line) (int, char *);
140 * Called to change one of the various levelled mechanisms in
141 * the listing generator. LIST_INCLUDE and LIST_MACRO can be
142 * used to increase the nesting level of include files and
143 * macro expansions; LIST_TIMES and LIST_INCBIN switch on the
144 * two binary-output-suppression mechanisms for large-scale
145 * pseudo-instructions.
147 * LIST_MACRO_NOLIST is synonymous with LIST_MACRO except that
148 * it indicates the beginning of the expansion of a `nolist'
149 * macro, so anything under that level won't be expanded unless
150 * it includes another file.
152 void (*uplevel) (int);
155 * Reverse the effects of uplevel.
157 void (*downlevel) (int);
161 * The expression evaluator must be passed a scanner function; a
162 * standard scanner is provided as part of nasmlib.c. The
163 * preprocessor will use a different one. Scanners, and the
164 * token-value structures they return, look like this.
166 * The return value from the scanner is always a copy of the
167 * `t_type' field in the structure.
171 int64_t t_integer, t_inttwo;
174 typedef int (*scanner) (void *private_data, struct tokenval * tv);
177 * Token types returned by the scanner, in addition to ordinary
178 * ASCII character values, and zero for end-of-string.
180 enum { /* token types, other than chars */
181 TOKEN_INVALID = -1, /* a placeholder value */
182 TOKEN_EOS = 0, /* end of string */
183 TOKEN_EQ = '=', TOKEN_GT = '>', TOKEN_LT = '<', /* aliases */
184 TOKEN_ID = 256, TOKEN_NUM, TOKEN_REG, TOKEN_INSN, /* major token types */
185 TOKEN_ERRNUM, /* numeric constant with error in */
186 TOKEN_HERE, TOKEN_BASE, /* $ and $$ */
187 TOKEN_SPECIAL, /* BYTE, WORD, DWORD, QWORD, FAR, NEAR, etc */
188 TOKEN_PREFIX, /* A32, O16, LOCK, REPNZ, TIMES, etc */
189 TOKEN_SHL, TOKEN_SHR, /* << and >> */
190 TOKEN_SDIV, TOKEN_SMOD, /* // and %% */
191 TOKEN_GE, TOKEN_LE, TOKEN_NE, /* >=, <= and <> (!= is same as <>) */
192 TOKEN_DBL_AND, TOKEN_DBL_OR, TOKEN_DBL_XOR, /* &&, || and ^^ */
193 TOKEN_SEG, TOKEN_WRT, /* SEG and WRT */
194 TOKEN_FLOAT, /* floating-point constant */
195 TOKEN_FLOATIZE, /* __floatX__ */
216 * Expression-evaluator datatype. Expressions, within the
217 * evaluator, are stored as an array of these beasts, terminated by
218 * a record with type==0. Mostly, it's a vector type: each type
219 * denotes some kind of a component, and the value denotes the
220 * multiple of that component present in the expression. The
221 * exception is the WRT type, whose `value' field denotes the
222 * segment to which the expression is relative. These segments will
223 * be segment-base types, i.e. either odd segment values or SEG_ABS
224 * types. So it is still valid to assume that anything with a
225 * `value' field of zero is insignificant.
228 int32_t type; /* a register, or EXPR_xxx */
229 int64_t value; /* must be >= 32 bits */
233 * Library routines to manipulate expression data types.
235 int is_reloc(expr *);
236 int is_simple(expr *);
237 int is_really_simple(expr *);
238 int is_unknown(expr *);
239 int is_just_unknown(expr *);
240 int64_t reloc_value(expr *);
241 int32_t reloc_seg(expr *);
242 int32_t reloc_wrt(expr *);
245 * The evaluator can also return hints about which of two registers
246 * used in an expression should be the base register. See also the
247 * `operand' structure.
255 * The actual expression evaluator function looks like this. When
256 * called, it expects the first token of its expression to already
257 * be in `*tv'; if it is not, set tv->t_type to TOKEN_INVALID and
258 * it will start by calling the scanner.
260 * If a forward reference happens during evaluation, the evaluator
261 * must set `*fwref' to true if `fwref' is non-NULL.
263 * `critical' is non-zero if the expression may not contain forward
264 * references. The evaluator will report its own error if this
265 * occurs; if `critical' is 1, the error will be "symbol not
266 * defined before use", whereas if `critical' is 2, the error will
267 * be "symbol undefined".
269 * If `critical' has bit 8 set (in addition to its main value: 0x101
270 * and 0x102 correspond to 1 and 2) then an extended expression
271 * syntax is recognised, in which relational operators such as =, <
272 * and >= are accepted, as well as low-precedence logical operators
275 * If `hints' is non-NULL, it gets filled in with some hints as to
276 * the base register in complex effective addresses.
278 #define CRITICAL 0x100
279 typedef expr *(*evalfunc) (scanner sc, void *scprivate,
280 struct tokenval * tv, int *fwref, int critical,
281 efunc error, struct eval_hints * hints);
284 * Special values for expr->type. These come after EXPR_REG_END
285 * as defined in regs.h.
288 #define EXPR_UNKNOWN (EXPR_REG_END+1) /* forward references */
289 #define EXPR_SIMPLE (EXPR_REG_END+2)
290 #define EXPR_WRT (EXPR_REG_END+3)
291 #define EXPR_SEGBASE (EXPR_REG_END+4)
294 * Preprocessors ought to look like this:
296 typedef struct preproc_ops {
298 * Called at the start of a pass; given a file name, the number
299 * of the pass, an error reporting function, an evaluator
300 * function, and a listing generator to talk to.
302 void (*reset) (char *, int, efunc, evalfunc, ListGen *);
305 * Called to fetch a line of preprocessed source. The line
306 * returned has been malloc'ed, and so should be freed after
309 char *(*getline) (void);
312 * Called at the end of a pass.
314 void (*cleanup) (int);
317 extern Preproc nasmpp;
320 * ----------------------------------------------------------------
321 * Some lexical properties of the NASM source language, included
322 * here because they are shared between the parser and preprocessor
323 * ----------------------------------------------------------------
327 * isidstart matches any character that may start an identifier, and isidchar
328 * matches any character that may appear at places other than the start of an
329 * identifier. E.g. a period may only appear at the start of an identifier
330 * (for local labels), whereas a number may appear anywhere *but* at the
334 #define isidstart(c) ( isalpha(c) || (c)=='_' || (c)=='.' || (c)=='?' \
336 #define isidchar(c) ( isidstart(c) || isdigit(c) || (c)=='$' || (c)=='#' \
339 /* Ditto for numeric constants. */
341 #define isnumstart(c) ( isdigit(c) || (c)=='$' )
342 #define isnumchar(c) ( isalnum(c) || (c)=='_' )
344 /* This returns the numeric value of a given 'digit'. */
346 #define numvalue(c) ((c)>='a' ? (c)-'a'+10 : (c)>='A' ? (c)-'A'+10 : (c)-'0')
349 * Data-type flags that get passed to listing-file routines.
352 LIST_READ, LIST_MACRO, LIST_MACRO_NOLIST, LIST_INCLUDE,
353 LIST_INCBIN, LIST_TIMES
357 * -----------------------------------------------------------
358 * Format of the `insn' structure returned from `parser.c' and
359 * passed into `assemble.c'
360 * -----------------------------------------------------------
364 * Here we define the operand types. These are implemented as bit
365 * masks, since some are subsets of others; e.g. AX in a MOV
366 * instruction is a special operand type, whereas AX in other
367 * contexts is just another 16-bit register. (Also, consider CL in
368 * shift instructions, DX in OUT, etc.)
370 * The basic concept here is that
371 * (class & ~operand) == 0
373 * if and only if "operand" belongs to class type "class".
375 * The bits are assigned as follows:
377 * Bits 0-7, 29: sizes
386 * 29: 128 bits (OWORD)
388 * Bits 8-11 modifiers
394 * Bits 12-15: type of operand
397 * 14: MEMORY (always has REGMEM attribute as well)
398 * 15: REGMEM (valid EA operand)
400 * Bits 16-19: subclasses
407 * 16: REG_ACCUM (AL, AX, EAX, RAX)
408 * 17: REG_COUNT (CL, CX, ECX, RCX)
409 * 18: REG_DATA (DL, DX, EDX, RDX)
410 * 19: REG_HIGH (AH, CH, DH, BH)
414 * 17: REG_DESS (DS, ES, SS)
425 * 16: MEM_OFFS (this is a simple offset)
426 * 17: IP_REL (IP-relative offset)
430 * 17: BYTENESS (-128..127)
432 * Bits 20-26: register classes
433 * 20: REG_CDT (CRx, DRx, TRx)
434 * 21: RM_GPR (REG_GPR) (integer register)
436 * 23: IP_REG (RIP or EIP) [unused]
438 * 25: RM_MMX (MMXREG)
439 * 26: RM_XMM (XMMREG)
441 * Bits 27-29 & 31 are currently unallocated.
444 * Special flag only used in instruction patterns; means this operand
445 * has to be identical to another operand. Currently only supported
449 typedef uint32_t opflags_t;
451 /* Size, and other attributes, of the operand */
452 #define BITS8 0x00000001L
453 #define BITS16 0x00000002L
454 #define BITS32 0x00000004L
455 #define BITS64 0x00000008L /* x64 and FPU only */
456 #define BITS80 0x00000010L /* FPU only */
457 #define BITS128 0x20000000L
458 #define FAR 0x00000020L /* grotty: this means 16:16 or */
459 /* 16:32, like in CALL/JMP */
460 #define NEAR 0x00000040L
461 #define SHORT 0x00000080L /* and this means what it says :) */
463 #define SIZE_MASK 0x200000FFL /* all the size attributes */
466 #define MODIFIER_MASK 0x00000f00L
467 #define TO 0x00000100L /* reverse effect in FADD, FSUB &c */
468 #define COLON 0x00000200L /* operand is followed by a colon */
469 #define STRICT 0x00000400L /* do not optimize this operand */
471 /* Type of operand: memory reference, register, etc. */
472 #define OPTYPE_MASK 0x0000f000L
473 #define REGISTER 0x00001000L /* register number in 'basereg' */
474 #define IMMEDIATE 0x00002000L
475 #define MEMORY 0x0000c000L
476 #define REGMEM 0x00008000L /* for r/m, ie EA, operands */
478 /* Register classes */
479 #define REG_EA 0x00009000L /* 'normal' reg, qualifies as EA */
480 #define RM_GPR 0x00208000L /* integer operand */
481 #define REG_GPR 0x00209000L /* integer register */
482 #define REG8 0x00209001L /* 8-bit GPR */
483 #define REG16 0x00209002L /* 16-bit GPR */
484 #define REG32 0x00209004L /* 32-bit GPR */
485 #define REG64 0x00209008L /* 64-bit GPR */
486 #define IP_REG 0x00801000L /* RIP or EIP register */
487 #define RIPREG 0x00801008L /* RIP */
488 #define EIPREG 0x00801004L /* EIP */
489 #define FPUREG 0x01001000L /* floating point stack registers */
490 #define FPU0 0x01011000L /* FPU stack register zero */
491 #define RM_MMX 0x02008000L /* MMX operand */
492 #define MMXREG 0x02009000L /* MMX register */
493 #define RM_XMM 0x04008000L /* XMM (SSE) operand */
494 #define XMMREG 0x04009000L /* XMM (SSE) register */
495 #define XMM0 0x04019000L /* XMM register zero */
496 #define REG_CDT 0x00101004L /* CRn, DRn and TRn */
497 #define REG_CREG 0x00111004L /* CRn */
498 #define REG_DREG 0x00121004L /* DRn */
499 #define REG_TREG 0x00141004L /* TRn */
500 #define REG_SREG 0x00401002L /* any segment register */
501 #define REG_CS 0x00411002L /* CS */
502 #define REG_DESS 0x00421002L /* DS, ES, SS */
503 #define REG_FSGS 0x00441002L /* FS, GS */
504 #define REG_SEG67 0x00481002L /* Unimplemented segment registers */
506 #define REG_RIP 0x00801008L /* RIP relative addressing */
507 #define REG_EIP 0x00801004L /* EIP relative addressing */
510 #define REG_SMASK 0x000f0000L /* a mask for the following */
511 #define REG_ACCUM 0x00219000L /* accumulator: AL, AX, EAX, RAX */
512 #define REG_AL 0x00219001L
513 #define REG_AX 0x00219002L
514 #define REG_EAX 0x00219004L
515 #define REG_RAX 0x00219008L
516 #define REG_COUNT 0x00229000L /* counter: CL, CX, ECX, RCX */
517 #define REG_CL 0x00229001L
518 #define REG_CX 0x00229002L
519 #define REG_ECX 0x00229004L
520 #define REG_RCX 0x00229008L
521 #define REG_DL 0x00249001L /* data: DL, DX, EDX, RDX */
522 #define REG_DX 0x00249002L
523 #define REG_EDX 0x00249004L
524 #define REG_RDX 0x00249008L
525 #define REG_HIGH 0x00289001L /* high regs: AH, CH, DH, BH */
527 /* special types of EAs */
528 #define MEM_OFFS 0x0001c000L /* simple [address] offset - absolute! */
529 #define IP_REL 0x0002c000L /* IP-relative offset */
531 /* memory which matches any type of r/m operand */
532 #define MEMORY_ANY (MEMORY|RM_GPR|RM_MMX|RM_XMM)
534 /* special type of immediate operand */
535 #define UNITY 0x00012000L /* for shift/rotate instructions */
536 #define SBYTE 0x00022000L /* for op r16/32,immediate instrs. */
539 #define SAME_AS 0x40000000L
541 /* Register names automatically generated from regs.dat */
544 enum ccode { /* condition code names */
545 C_A, C_AE, C_B, C_BE, C_C, C_E, C_G, C_GE, C_L, C_LE, C_NA, C_NAE,
546 C_NB, C_NBE, C_NC, C_NE, C_NG, C_NGE, C_NL, C_NLE, C_NO, C_NP,
547 C_NS, C_NZ, C_O, C_P, C_PE, C_PO, C_S, C_Z,
554 #define REX_OC 0x0200 /* DREX suffix has the OC0 bit set */
555 #define REX_D 0x0100 /* Instruction uses DREX instead of REX */
556 #define REX_H 0x80 /* High register present, REX forbidden */
557 #define REX_P 0x40 /* REX prefix present/required */
558 #define REX_L 0x20 /* Use LOCK prefix instead of REX.R */
559 #define REX_W 0x08 /* 64-bit operand size */
560 #define REX_R 0x04 /* ModRM reg extension */
561 #define REX_X 0x02 /* SIB index extension */
562 #define REX_B 0x01 /* ModRM r/m extension */
563 #define REX_REAL 0x4f /* Actual REX prefix bits */
566 * Note that because segment registers may be used as instruction
567 * prefixes, we must ensure the enumerations for prefixes and
568 * register names do not overlap.
570 enum prefixes { /* instruction prefixes */
572 PREFIX_ENUM_START = REG_ENUM_LIMIT,
573 P_A16 = PREFIX_ENUM_START, P_A32, P_A64, P_ASP,
574 P_LOCK, P_O16, P_O32, P_O64, P_OSP,
575 P_REP, P_REPE, P_REPNE, P_REPNZ, P_REPZ, P_TIMES,
579 enum { /* extended operand types */
580 EOT_NOTHING, EOT_DB_STRING, EOT_DB_NUMBER
583 enum { /* special EA flags */
584 EAF_BYTEOFFS = 1, /* force offset part to byte size */
585 EAF_WORDOFFS = 2, /* force offset part to [d]word size */
586 EAF_TIMESTWO = 4, /* really do EAX*2 not EAX+EAX */
587 EAF_REL = 8, /* IP-relative addressing */
588 EAF_ABS = 16, /* non-IP-relative addressing */
589 EAF_FSGS = 32 /* fs/gs segment override present */
592 enum eval_hint { /* values for `hinttype' */
593 EAH_NOHINT = 0, /* no hint at all - our discretion */
594 EAH_MAKEBASE = 1, /* try to make given reg the base */
595 EAH_NOTBASE = 2 /* try _not_ to make reg the base */
598 typedef struct operand { /* operand to an instruction */
599 int32_t type; /* type of operand */
600 int disp_size; /* 0 means default; 16; 32; 64 */
601 enum reg_enum basereg, indexreg; /* address registers */
602 int scale; /* index scale */
604 enum eval_hint hinttype; /* hint as to real base register */
605 int32_t segment; /* immediate segment, if needed */
606 int64_t offset; /* any immediate number */
607 int32_t wrt; /* segment base it's relative to */
608 int eaflags; /* special EA flags */
609 int opflags; /* see OPFLAG_* defines below */
612 #define OPFLAG_FORWARD 1 /* operand is a forward reference */
613 #define OPFLAG_EXTERN 2 /* operand is an external reference */
615 typedef struct extop { /* extended operand */
616 struct extop *next; /* linked list */
617 int32_t type; /* defined above */
618 char *stringval; /* if it's a string, then here it is */
619 int stringlen; /* ... and here's how long it is */
620 int32_t segment; /* if it's a number/address, then... */
621 int64_t offset; /* ... it's given here ... */
622 int32_t wrt; /* ... and here */
625 /* Prefix positions: each type of prefix goes in a specific slot.
626 This affects the final ordering of the assembled output, which
627 shouldn't matter to the processor, but if you have stylistic
628 preferences, you can change this. REX prefixes are handled
629 differently for the time being.
631 Note that LOCK and REP are in the same slot. This is
632 an x86 architectural constraint. */
634 PPS_LREP, /* Lock or REP prefix */
635 PPS_SEG, /* Segment override prefix */
636 PPS_OSIZE, /* Operand size prefix */
637 PPS_ASIZE, /* Address size prefix */
638 MAXPREFIX /* Total number of prefix slots */
641 #define MAX_OPERANDS 4
643 typedef struct insn { /* an instruction itself */
644 char *label; /* the label defined, or NULL */
645 enum prefixes prefixes[MAXPREFIX]; /* instruction prefixes, if any */
646 enum opcode opcode; /* the opcode - not just the string */
647 enum ccode condition; /* the condition code, if Jcc/SETcc */
648 int operands; /* how many operands? 0-3
649 * (more if db et al) */
650 int addr_size; /* address size */
651 operand oprs[MAX_OPERANDS]; /* the operands, defined as above */
652 extop *eops; /* extended operands */
653 int eops_float; /* true if DD and floating */
654 int32_t times; /* repeat count (TIMES prefix) */
655 int forw_ref; /* is there a forward reference? */
656 int rex; /* Special REX Prefix */
657 int drexdst; /* Destination register for DREX suffix */
660 enum geninfo { GI_SWITCH };
662 * ------------------------------------------------------------
663 * The data structure defining an output format driver, and the
664 * interfaces to the functions therein.
665 * ------------------------------------------------------------
670 * This is a short (one-liner) description of the type of
671 * output generated by the driver.
673 const char *fullname;
676 * This is a single keyword used to select the driver.
678 const char *shortname;
682 * this is reserved for out module specific help.
683 * It is set to NULL in all the out modules and is not implemented
684 * in the main program
686 const char *helpstring;
689 * this is a pointer to the first element of the debug information
691 struct dfmt **debug_formats;
694 * and a pointer to the element that is being used
695 * note: this is set to the default at compile time and changed if the
696 * -F option is selected. If developing a set of new debug formats for
697 * an output format, be sure to set this to whatever default you want
700 struct dfmt *current_dfmt;
703 * This, if non-NULL, is a NULL-terminated list of `char *'s
704 * pointing to extra standard macros supplied by the object
705 * format (e.g. a sensible initial default value of __SECT__,
706 * and user-level equivalents for any format-specific
712 * This procedure is called at the start of an output session.
713 * It tells the output format what file it will be writing to,
714 * what routine to report errors through, and how to interface
715 * to the label manager and expression evaluator if necessary.
716 * It also gives it a chance to do other initialisation.
718 void (*init) (FILE * fp, efunc error, ldfunc ldef, evalfunc eval);
721 * This procedure is called to pass generic information to the
722 * object file. The first parameter gives the information type
723 * (currently only command line switches)
724 * and the second parameter gives the value. This function returns
725 * 1 if recognized, 0 if unrecognized
727 int (*setinfo) (enum geninfo type, char **string);
730 * This procedure is called by assemble() to write actual
731 * generated code or data to the object file. Typically it
732 * doesn't have to actually _write_ it, just store it for
735 * The `type' argument specifies the type of output data, and
736 * usually the size as well: its contents are described below.
738 void (*output) (int32_t segto, const void *data,
739 enum out_type type, uint64_t size,
740 int32_t segment, int32_t wrt);
743 * This procedure is called once for every symbol defined in
744 * the module being assembled. It gives the name and value of
745 * the symbol, in NASM's terms, and indicates whether it has
746 * been declared to be global. Note that the parameter "name",
747 * when passed, will point to a piece of static storage
748 * allocated inside the label manager - it's safe to keep using
749 * that pointer, because the label manager doesn't clean up
750 * until after the output driver has.
752 * Values of `is_global' are: 0 means the symbol is local; 1
753 * means the symbol is global; 2 means the symbol is common (in
754 * which case `offset' holds the _size_ of the variable).
755 * Anything else is available for the output driver to use
758 * This routine explicitly _is_ allowed to call the label
759 * manager to define further symbols, if it wants to, even
760 * though it's been called _from_ the label manager. That much
761 * re-entrancy is guaranteed in the label manager. However, the
762 * label manager will in turn call this routine, so it should
763 * be prepared to be re-entrant itself.
765 * The `special' parameter contains special information passed
766 * through from the command that defined the label: it may have
767 * been an EXTERN, a COMMON or a GLOBAL. The distinction should
768 * be obvious to the output format from the other parameters.
770 void (*symdef) (char *name, int32_t segment, int64_t offset,
771 int is_global, char *special);
774 * This procedure is called when the source code requests a
775 * segment change. It should return the corresponding segment
776 * _number_ for the name, or NO_SEG if the name is not a valid
779 * It may also be called with NULL, in which case it is to
780 * return the _default_ section number for starting assembly in.
782 * It is allowed to modify the string it is given a pointer to.
784 * It is also allowed to specify a default instruction size for
785 * the segment, by setting `*bits' to 16 or 32. Or, if it
786 * doesn't wish to define a default, it can leave `bits' alone.
788 int32_t (*section) (char *name, int pass, int *bits);
791 * This procedure is called to modify the segment base values
792 * returned from the SEG operator. It is given a segment base
793 * value (i.e. a segment value with the low bit set), and is
794 * required to produce in return a segment value which may be
795 * different. It can map segment bases to absolute numbers by
796 * means of returning SEG_ABS types.
798 * It should return NO_SEG if the segment base cannot be
799 * determined; the evaluator (which calls this routine) is
800 * responsible for throwing an error condition if that occurs
801 * in pass two or in a critical expression.
803 int32_t (*segbase) (int32_t segment);
806 * This procedure is called to allow the output driver to
807 * process its own specific directives. When called, it has the
808 * directive word in `directive' and the parameter string in
809 * `value'. It is called in both assembly passes, and `pass'
810 * will be either 1 or 2.
812 * This procedure should return zero if it does not _recognise_
813 * the directive, so that the main program can report an error.
814 * If it recognises the directive but then has its own errors,
815 * it should report them itself and then return non-zero. It
816 * should also return non-zero if it correctly processes the
819 int (*directive) (char *directive, char *value, int pass);
822 * This procedure is called before anything else - even before
823 * the "init" routine - and is passed the name of the input
824 * file from which this output file is being generated. It
825 * should return its preferred name for the output file in
826 * `outname', if outname[0] is not '\0', and do nothing to
827 * `outname' otherwise. Since it is called before the driver is
828 * properly initialized, it has to be passed its error handler
831 * This procedure may also take its own copy of the input file
832 * name for use in writing the output file: it is _guaranteed_
833 * that it will be called before the "init" routine.
835 * The parameter `outname' points to an area of storage
836 * guaranteed to be at least FILENAME_MAX in size.
838 void (*filename) (char *inname, char *outname, efunc error);
841 * This procedure is called after assembly finishes, to allow
842 * the output driver to clean itself up and free its memory.
843 * Typically, it will also be the point at which the object
844 * file actually gets _written_.
846 * One thing the cleanup routine should always do is to close
847 * the output file pointer.
849 void (*cleanup) (int debuginfo);
854 * ------------------------------------------------------------
855 * The data structure defining a debug format driver, and the
856 * interfaces to the functions therein.
857 * ------------------------------------------------------------
863 * This is a short (one-liner) description of the type of
864 * output generated by the driver.
866 const char *fullname;
869 * This is a single keyword used to select the driver.
871 const char *shortname;
874 * init - called initially to set up local pointer to object format,
875 * void pointer to implementation defined data, file pointer (which
876 * probably won't be used, but who knows?), and error function.
878 void (*init) (struct ofmt * of, void *id, FILE * fp, efunc error);
881 * linenum - called any time there is output with a change of
882 * line number or file.
884 void (*linenum) (const char *filename, int32_t linenumber, int32_t segto);
887 * debug_deflabel - called whenever a label is defined. Parameters
888 * are the same as to 'symdef()' in the output format. This function
889 * would be called before the output format version.
892 void (*debug_deflabel) (char *name, int32_t segment, int64_t offset,
893 int is_global, char *special);
895 * debug_directive - called whenever a DEBUG directive other than 'LINE'
896 * is encountered. 'directive' contains the first parameter to the
897 * DEBUG directive, and params contains the rest. For example,
898 * 'DEBUG VAR _somevar:int' would translate to a call to this
899 * function with 'directive' equal to "VAR" and 'params' equal to
902 void (*debug_directive) (const char *directive, const char *params);
905 * typevalue - called whenever the assembler wishes to register a type
906 * for the last defined label. This routine MUST detect if a type was
907 * already registered and not re-register it.
909 void (*debug_typevalue) (int32_t type);
912 * debug_output - called whenever output is required
913 * 'type' is the type of info required, and this is format-specific
915 void (*debug_output) (int type, void *param);
918 * cleanup - called after processing of file is complete
920 void (*cleanup) (void);
924 * The type definition macros
927 * low 3 bits: reserved
929 * next 24 bits: number of elements for arrays (0 for labels)
932 #define TY_UNKNOWN 0x00
933 #define TY_LABEL 0x08
936 #define TY_DWORD 0x20
937 #define TY_FLOAT 0x28
938 #define TY_QWORD 0x30
939 #define TY_TBYTE 0x38
940 #define TY_OWORD 0x40
941 #define TY_COMMON 0xE0
943 #define TY_EXTERN 0xF0
946 #define TYM_TYPE(x) ((x) & 0xF8)
947 #define TYM_ELEMENTS(x) (((x) & 0xFFFFFF00) >> 8)
949 #define TYS_ELEMENTS(x) ((x) << 8)
957 enum special_tokens {
958 SPECIAL_ENUM_START = PREFIX_ENUM_LIMIT,
959 S_ABS = SPECIAL_ENUM_START,
960 S_BYTE, S_DWORD, S_FAR, S_LONG, S_NEAR, S_NOSPLIT,
961 S_OWORD, S_QWORD, S_REL, S_SHORT, S_STRICT, S_TO, S_TWORD, S_WORD,
972 * This declaration passes the "pass" number to all other modules
973 * "pass0" assumes the values: 0, 0, ..., 0, 1, 2
974 * where 0 = optimizing pass
981 extern bool tasm_compatible_mode;
982 extern int optimizing;
983 extern int globalbits; /* 16, 32 or 64-bit mode */
984 extern int globalrel; /* default to relative addressing? */
985 extern int maxbits; /* max bits supported by output */