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87bc61964c
nasm/nasm.h
H. Peter Anvin 87bc61964c NASM 0.97
2002-04-30 20:53:16 +00:00

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/* nasm.h main header file for the Netwide Assembler: inter-module interface
*
* The Netwide Assembler is copyright (C) 1996 Simon Tatham and
* Julian Hall. All rights reserved. The software is
* redistributable under the licence given in the file "Licence"
* distributed in the NASM archive.
*
* initial version: 27/iii/95 by Simon Tatham
*/
#ifndef NASM_NASM_H
#define NASM_NASM_H
#define NASM_MAJOR_VER 0
#define NASM_MINOR_VER 97
#define NASM_VER "0.97"
#ifndef NULL
#define NULL 0
#endif
#ifndef FALSE
#define FALSE 0 /* comes in handy */
#endif
#ifndef TRUE
#define TRUE 1
#endif
#define NO_SEG -1L /* null segment value */
#define SEG_ABS 0x40000000L /* mask for far-absolute segments */
#ifndef FILENAME_MAX
#define FILENAME_MAX 256
#endif
/*
* Name pollution problems: <time.h> on Digital UNIX pulls in some
* strange hardware header file which sees fit to define R_SP. We
* undefine it here so as not to break the enum below.
*/
#ifdef R_SP
#undef R_SP
#endif
/*
* We must declare the existence of this structure type up here,
* since we have to reference it before we define it...
*/
struct ofmt;
/*
* -------------------------
* Error reporting functions
* -------------------------
*/
/*
* An error reporting function should look like this.
*/
typedef void (*efunc) (int severity, char *fmt, ...);
/*
* These are the error severity codes which get passed as the first
* argument to an efunc.
*/
#define ERR_WARNING 0 /* warn only: no further action */
#define ERR_NONFATAL 1 /* terminate assembly after phase */
#define ERR_FATAL 2 /* instantly fatal: exit with error */
#define ERR_PANIC 3 /* internal error: panic instantly
* and dump core for reference */
#define ERR_MASK 0x0F /* mask off the above codes */
#define ERR_NOFILE 0x10 /* don't give source file name/line */
#define ERR_USAGE 0x20 /* print a usage message */
#define ERR_OFFBY1 0x40 /* report error as being on the line
* we're just _about_ to read, not
* the one we've just read */
#define ERR_PASS1 0x80 /* only print this error on pass one */
/*
* These codes define specific types of suppressible warning.
*/
#define ERR_WARN_MNP 0x0100 /* macro-num-parameters warning */
#define ERR_WARN_OL 0x0200 /* orphan label (no colon, and
* alone on line) */
#define ERR_WARN_NOV 0x0300 /* numeric overflow */
#define ERR_WARN_MASK 0xFF00 /* the mask for this feature */
#define ERR_WARN_SHR 8 /* how far to shift right */
#define ERR_WARN_MAX 3 /* the highest numbered one */
/*
* -----------------------
* Other function typedefs
* -----------------------
*/
/*
* A label-lookup function should look like this.
*/
typedef int (*lfunc) (char *label, long *segment, long *offset);
/*
* And a label-definition function like this. The boolean parameter
* `is_norm' states whether the label is a `normal' label (which
* should affect the local-label system), or something odder like
* an EQU or a segment-base symbol, which shouldn't.
*/
typedef void (*ldfunc) (char *label, long segment, long offset, char *special,
int is_norm, int isextrn, struct ofmt *ofmt,
efunc error);
/*
* List-file generators should look like this:
*/
typedef struct {
/*
* Called to initialise the listing file generator. Before this
* is called, the other routines will silently do nothing when
* called. The `char *' parameter is the file name to write the
* listing to.
*/
void (*init) (char *, efunc);
/*
* Called to clear stuff up and close the listing file.
*/
void (*cleanup) (void);
/*
* Called to output binary data. Parameters are: the offset;
* the data; the data type. Data types are similar to the
* output-format interface, only OUT_ADDRESS will _always_ be
* displayed as if it's relocatable, so ensure that any non-
* relocatable address has been converted to OUT_RAWDATA by
* then. Note that OUT_RAWDATA+0 is a valid data type, and is a
* dummy call used to give the listing generator an offset to
* work with when doing things like uplevel(LIST_TIMES) or
* uplevel(LIST_INCBIN).
*/
void (*output) (long, void *, unsigned long);
/*
* Called to send a text line to the listing generator. The
* `int' parameter is LIST_READ or LIST_MACRO depending on
* whether the line came directly from an input file or is the
* result of a multi-line macro expansion.
*/
void (*line) (int, char *);
/*
* Called to change one of the various levelled mechanisms in
* the listing generator. LIST_INCLUDE and LIST_MACRO can be
* used to increase the nesting level of include files and
* macro expansions; LIST_TIMES and LIST_INCBIN switch on the
* two binary-output-suppression mechanisms for large-scale
* pseudo-instructions.
*
* LIST_MACRO_NOLIST is synonymous with LIST_MACRO except that
* it indicates the beginning of the expansion of a `nolist'
* macro, so anything under that level won't be expanded unless
* it includes another file.
*/
void (*uplevel) (int);
/*
* Reverse the effects of uplevel.
*/
void (*downlevel) (int);
} ListGen;
/*
* The expression evaluator must be passed a scanner function; a
* standard scanner is provided as part of nasmlib.c. The
* preprocessor will use a different one. Scanners, and the
* token-value structures they return, look like this.
*
* The return value from the scanner is always a copy of the
* `t_type' field in the structure.
*/
struct tokenval {
int t_type;
long t_integer, t_inttwo;
char *t_charptr;
};
typedef int (*scanner) (void *private_data, struct tokenval *tv);
/*
* Token types returned by the scanner, in addition to ordinary
* ASCII character values, and zero for end-of-string.
*/
enum { /* token types, other than chars */
TOKEN_INVALID = -1, /* a placeholder value */
TOKEN_EOS = 0, /* end of string */
TOKEN_EQ = '=', TOKEN_GT = '>', TOKEN_LT = '<', /* aliases */
TOKEN_ID = 256, TOKEN_NUM, TOKEN_REG, TOKEN_INSN, /* major token types */
TOKEN_ERRNUM, /* numeric constant with error in */
TOKEN_HERE, TOKEN_BASE, /* $ and $$ */
TOKEN_SPECIAL, /* BYTE, WORD, DWORD, FAR, NEAR, etc */
TOKEN_PREFIX, /* A32, O16, LOCK, REPNZ, TIMES, etc */
TOKEN_SHL, TOKEN_SHR, /* << and >> */
TOKEN_SDIV, TOKEN_SMOD, /* // and %% */
TOKEN_GE, TOKEN_LE, TOKEN_NE, /* >=, <= and <> (!= is same as <>) */
TOKEN_DBL_AND, TOKEN_DBL_OR, TOKEN_DBL_XOR, /* &&, || and ^^ */
TOKEN_SEG, TOKEN_WRT, /* SEG and WRT */
TOKEN_FLOAT /* floating-point constant */
};
/*
* Expression-evaluator datatype. Expressions, within the
* evaluator, are stored as an array of these beasts, terminated by
* a record with type==0. Mostly, it's a vector type: each type
* denotes some kind of a component, and the value denotes the
* multiple of that component present in the expression. The
* exception is the WRT type, whose `value' field denotes the
* segment to which the expression is relative. These segments will
* be segment-base types, i.e. either odd segment values or SEG_ABS
* types. So it is still valid to assume that anything with a
* `value' field of zero is insignificant.
*/
typedef struct {
long type; /* a register, or EXPR_xxx */
long value; /* must be >= 32 bits */
} expr;
/*
* The evaluator can also return hints about which of two registers
* used in an expression should be the base register. See also the
* `operand' structure.
*/
struct eval_hints {
int base;
int type;
};
/*
* The actual expression evaluator function looks like this. When
* called, it expects the first token of its expression to already
* be in `*tv'; if it is not, set tv->t_type to TOKEN_INVALID and
* it will start by calling the scanner.
*
* If a forward reference happens during evaluation, the evaluator
* must set `*fwref' to TRUE if `fwref' is non-NULL.
*
* `critical' is non-zero if the expression may not contain forward
* references. The evaluator will report its own error if this
* occurs; if `critical' is 1, the error will be "symbol not
* defined before use", whereas if `critical' is 2, the error will
* be "symbol undefined".
*
* If `critical' has bit 4 set (in addition to its main value: 0x11
* and 0x12 correspond to 1 and 2) then an extended expression
* syntax is recognised, in which relational operators such as =, <
* and >= are accepted, as well as low-precedence logical operators
* &&, ^^ and ||.
*
* If `hints' is non-NULL, it gets filled in with some hints as to
* the base register in complex effective addresses.
*/
typedef expr *(*evalfunc) (scanner sc, void *scprivate, struct tokenval *tv,
int *fwref, int critical, efunc error,
struct eval_hints *hints);
/*
* There's also an auxiliary routine through which the evaluator
* needs to hear about the value of $ and the label (if any)
* defined on the current line.
*/
typedef void (*evalinfofunc) (char *labelname, long segment, long offset);
/*
* Special values for expr->type. ASSUMPTION MADE HERE: the number
* of distinct register names (i.e. possible "type" fields for an
* expr structure) does not exceed 124 (EXPR_REG_START through
* EXPR_REG_END).
*/
#define EXPR_REG_START 1
#define EXPR_REG_END 124
#define EXPR_UNKNOWN 125L /* for forward references */
#define EXPR_SIMPLE 126L
#define EXPR_WRT 127L
#define EXPR_SEGBASE 128L
/*
* Preprocessors ought to look like this:
*/
typedef struct {
/*
* Called at the start of a pass; given a file name, the number
* of the pass, an error reporting function, an evaluator
* function, and a listing generator to talk to.
*/
void (*reset) (char *, int, efunc, evalfunc, ListGen *);
/*
* Called to fetch a line of preprocessed source. The line
* returned has been malloc'ed, and so should be freed after
* use.
*/
char *(*getline) (void);
/*
* Called at the end of a pass.
*/
void (*cleanup) (void);
} Preproc;
/*
* ----------------------------------------------------------------
* Some lexical properties of the NASM source language, included
* here because they are shared between the parser and preprocessor
* ----------------------------------------------------------------
*/
/* isidstart matches any character that may start an identifier, and isidchar
* matches any character that may appear at places other than the start of an
* identifier. E.g. a period may only appear at the start of an identifier
* (for local labels), whereas a number may appear anywhere *but* at the
* start. */
#define isidstart(c) ( isalpha(c) || (c)=='_' || (c)=='.' || (c)=='?' \
|| (c)=='@' )
#define isidchar(c) ( isidstart(c) || isdigit(c) || (c)=='$' || (c)=='#' \
|| (c)=='~' )
/* Ditto for numeric constants. */
#define isnumstart(c) ( isdigit(c) || (c)=='$' )
#define isnumchar(c) ( isalnum(c) )
/* This returns the numeric value of a given 'digit'. */
#define numvalue(c) ((c)>='a' ? (c)-'a'+10 : (c)>='A' ? (c)-'A'+10 : (c)-'0')
/*
* Data-type flags that get passed to listing-file routines.
*/
enum {
LIST_READ, LIST_MACRO, LIST_MACRO_NOLIST, LIST_INCLUDE,
LIST_INCBIN, LIST_TIMES
};
/*
* -----------------------------------------------------------
* Format of the `insn' structure returned from `parser.c' and
* passed into `assemble.c'
* -----------------------------------------------------------
*/
/*
* Here we define the operand types. These are implemented as bit
* masks, since some are subsets of others; e.g. AX in a MOV
* instruction is a special operand type, whereas AX in other
* contexts is just another 16-bit register. (Also, consider CL in
* shift instructions, DX in OUT, etc.)
*/
/* size, and other attributes, of the operand */
#define BITS8 0x00000001L
#define BITS16 0x00000002L
#define BITS32 0x00000004L
#define BITS64 0x00000008L /* FPU only */
#define BITS80 0x00000010L /* FPU only */
#define FAR 0x00000020L /* grotty: this means 16:16 or */
/* 16:32, like in CALL/JMP */
#define NEAR 0x00000040L
#define SHORT 0x00000080L /* and this means what it says :) */
#define SIZE_MASK 0x000000FFL /* all the size attributes */
#define NON_SIZE (~SIZE_MASK)
#define TO 0x00000100L /* reverse effect in FADD, FSUB &c */
#define COLON 0x00000200L /* operand is followed by a colon */
/* type of operand: memory reference, register, etc. */
#define MEMORY 0x00204000L
#define REGISTER 0x00001000L /* register number in 'basereg' */
#define IMMEDIATE 0x00002000L
#define REGMEM 0x00200000L /* for r/m, ie EA, operands */
#define REGNORM 0x00201000L /* 'normal' reg, qualifies as EA */
#define REG8 0x00201001L
#define REG16 0x00201002L
#define REG32 0x00201004L
#define MMXREG 0x00201008L /* MMX registers */
#define FPUREG 0x01000000L /* floating point stack registers */
#define FPU0 0x01000800L /* FPU stack register zero */
/* special register operands: these may be treated differently */
#define REG_SMASK 0x00070000L /* a mask for the following */
#define REG_ACCUM 0x00211000L /* accumulator: AL, AX or EAX */
#define REG_AL 0x00211001L /* REG_ACCUM | BITSxx */
#define REG_AX 0x00211002L /* ditto */
#define REG_EAX 0x00211004L /* and again */
#define REG_COUNT 0x00221000L /* counter: CL, CX or ECX */
#define REG_CL 0x00221001L /* REG_COUNT | BITSxx */
#define REG_CX 0x00221002L /* ditto */
#define REG_ECX 0x00221004L /* another one */
#define REG_DX 0x00241002L
#define REG_SREG 0x00081002L /* any segment register */
#define REG_CS 0x01081002L /* CS */
#define REG_DESS 0x02081002L /* DS, ES, SS (non-CS 86 registers) */
#define REG_FSGS 0x04081002L /* FS, GS (386 extended registers) */
#define REG_CDT 0x00101004L /* CRn, DRn and TRn */
#define REG_CREG 0x08101004L /* CRn */
#define REG_CR4 0x08101404L /* CR4 (Pentium only) */
#define REG_DREG 0x10101004L /* DRn */
#define REG_TREG 0x20101004L /* TRn */
/* special type of EA */
#define MEM_OFFS 0x00604000L /* simple [address] offset */
/* special type of immediate operand */
#define ONENESS 0x00800000L /* so UNITY == IMMEDIATE | ONENESS */
#define UNITY 0x00802000L /* for shift/rotate instructions */
/*
* Next, the codes returned from the parser, for registers and
* instructions.
*/
enum { /* register names */
R_AH = EXPR_REG_START, R_AL, R_AX, R_BH, R_BL, R_BP, R_BX, R_CH,
R_CL, R_CR0, R_CR2, R_CR3, R_CR4, R_CS, R_CX, R_DH, R_DI, R_DL,
R_DR0, R_DR1, R_DR2, R_DR3, R_DR6, R_DR7, R_DS, R_DX, R_EAX,
R_EBP, R_EBX, R_ECX, R_EDI, R_EDX, R_ES, R_ESI, R_ESP, R_FS,
R_GS, R_MM0, R_MM1, R_MM2, R_MM3, R_MM4, R_MM5, R_MM6, R_MM7,
R_SI, R_SP, R_SS, R_ST0, R_ST1, R_ST2, R_ST3, R_ST4, R_ST5,
R_ST6, R_ST7, R_TR3, R_TR4, R_TR5, R_TR6, R_TR7, REG_ENUM_LIMIT
};
enum { /* instruction names */
I_AAA, I_AAD, I_AAM, I_AAS, I_ADC, I_ADD, I_AND, I_ARPL,
I_BOUND, I_BSF, I_BSR, I_BSWAP, I_BT, I_BTC, I_BTR, I_BTS,
I_CALL, I_CBW, I_CDQ, I_CLC, I_CLD, I_CLI, I_CLTS, I_CMC, I_CMP,
I_CMPSB, I_CMPSD, I_CMPSW, I_CMPXCHG, I_CMPXCHG486, I_CMPXCHG8B,
I_CPUID, I_CWD, I_CWDE, I_DAA, I_DAS, I_DB, I_DD, I_DEC, I_DIV,
I_DQ, I_DT, I_DW, I_EMMS, I_ENTER, I_EQU, I_F2XM1, I_FABS,
I_FADD, I_FADDP, I_FBLD, I_FBSTP, I_FCHS, I_FCLEX, I_FCMOVB,
I_FCMOVBE, I_FCMOVE, I_FCMOVNB, I_FCMOVNBE, I_FCMOVNE,
I_FCMOVNU, I_FCMOVU, I_FCOM, I_FCOMI, I_FCOMIP, I_FCOMP,
I_FCOMPP, I_FCOS, I_FDECSTP, I_FDISI, I_FDIV, I_FDIVP, I_FDIVR,
I_FDIVRP, I_FENI, I_FFREE, I_FIADD, I_FICOM, I_FICOMP, I_FIDIV,
I_FIDIVR, I_FILD, I_FIMUL, I_FINCSTP, I_FINIT, I_FIST, I_FISTP,
I_FISUB, I_FISUBR, I_FLD, I_FLD1, I_FLDCW, I_FLDENV, I_FLDL2E,
I_FLDL2T, I_FLDLG2, I_FLDLN2, I_FLDPI, I_FLDZ, I_FMUL, I_FMULP,
I_FNCLEX, I_FNDISI, I_FNENI, I_FNINIT, I_FNOP, I_FNSAVE,
I_FNSTCW, I_FNSTENV, I_FNSTSW, I_FPATAN, I_FPREM, I_FPREM1,
I_FPTAN, I_FRNDINT, I_FRSTOR, I_FSAVE, I_FSCALE, I_FSETPM,
I_FSIN, I_FSINCOS, I_FSQRT, I_FST, I_FSTCW, I_FSTENV, I_FSTP,
I_FSTSW, I_FSUB, I_FSUBP, I_FSUBR, I_FSUBRP, I_FTST, I_FUCOM,
I_FUCOMI, I_FUCOMIP, I_FUCOMP, I_FUCOMPP, I_FXAM, I_FXCH,
I_FXTRACT, I_FYL2X, I_FYL2XP1, I_HLT, I_IBTS, I_ICEBP, I_IDIV,
I_IMUL, I_IN, I_INC, I_INCBIN, I_INSB, I_INSD, I_INSW, I_INT,
I_INT1, I_INT01, I_INT3, I_INTO, I_INVD, I_INVLPG, I_IRET,
I_IRETD, I_IRETW, I_JCXZ, I_JECXZ, I_JMP, I_LAHF, I_LAR, I_LDS,
I_LEA, I_LEAVE, I_LES, I_LFS, I_LGDT, I_LGS, I_LIDT, I_LLDT,
I_LMSW, I_LOADALL, I_LOADALL286, I_LODSB, I_LODSD, I_LODSW,
I_LOOP, I_LOOPE, I_LOOPNE, I_LOOPNZ, I_LOOPZ, I_LSL, I_LSS,
I_LTR, I_MOV, I_MOVD, I_MOVQ, I_MOVSB, I_MOVSD, I_MOVSW,
I_MOVSX, I_MOVZX, I_MUL, I_NEG, I_NOP, I_NOT, I_OR, I_OUT,
I_OUTSB, I_OUTSD, I_OUTSW, I_PACKSSDW, I_PACKSSWB, I_PACKUSWB,
I_PADDB, I_PADDD, I_PADDSB, I_PADDSIW, I_PADDSW, I_PADDUSB,
I_PADDUSW, I_PADDW, I_PAND, I_PANDN, I_PAVEB, I_PCMPEQB,
I_PCMPEQD, I_PCMPEQW, I_PCMPGTB, I_PCMPGTD, I_PCMPGTW,
I_PDISTIB, I_PMACHRIW, I_PMADDWD, I_PMAGW, I_PMULHRW,
I_PMULHRIW, I_PMULHW, I_PMULLW, I_PMVGEZB, I_PMVLZB, I_PMVNZB,
I_PMVZB, I_POP, I_POPA, I_POPAD, I_POPAW, I_POPF, I_POPFD,
I_POPFW, I_POR, I_PSLLD, I_PSLLQ, I_PSLLW, I_PSRAD, I_PSRAW,
I_PSRLD, I_PSRLQ, I_PSRLW, I_PSUBB, I_PSUBD, I_PSUBSB,
I_PSUBSIW, I_PSUBSW, I_PSUBUSB, I_PSUBUSW, I_PSUBW, I_PUNPCKHBW,
I_PUNPCKHDQ, I_PUNPCKHWD, I_PUNPCKLBW, I_PUNPCKLDQ, I_PUNPCKLWD,
I_PUSH, I_PUSHA, I_PUSHAD, I_PUSHAW, I_PUSHF, I_PUSHFD,
I_PUSHFW, I_PXOR, I_RCL, I_RCR, I_RDMSR, I_RDPMC, I_RDTSC,
I_RESB, I_RESD, I_RESQ, I_REST, I_RESW, I_RET, I_RETF, I_RETN,
I_ROL, I_ROR, I_RSM, I_SAHF, I_SAL, I_SALC, I_SAR, I_SBB,
I_SCASB, I_SCASD, I_SCASW, I_SGDT, I_SHL, I_SHLD, I_SHR, I_SHRD,
I_SIDT, I_SLDT, I_SMI, I_SMSW, I_STC, I_STD, I_STI, I_STOSB,
I_STOSD, I_STOSW, I_STR, I_SUB, I_TEST, I_UMOV, I_VERR, I_VERW,
I_WAIT, I_WBINVD, I_WRMSR, I_XADD, I_XBTS, I_XCHG, I_XLATB,
I_XOR, I_CMOVcc, I_Jcc, I_SETcc
};
enum { /* condition code names */
C_A, C_AE, C_B, C_BE, C_C, C_E, C_G, C_GE, C_L, C_LE, C_NA, C_NAE,
C_NB, C_NBE, C_NC, C_NE, C_NG, C_NGE, C_NL, C_NLE, C_NO, C_NP,
C_NS, C_NZ, C_O, C_P, C_PE, C_PO, C_S, C_Z
};
/*
* Note that because segment registers may be used as instruction
* prefixes, we must ensure the enumerations for prefixes and
* register names do not overlap.
*/
enum { /* instruction prefixes */
PREFIX_ENUM_START = REG_ENUM_LIMIT,
P_A16 = PREFIX_ENUM_START, P_A32, P_LOCK, P_O16, P_O32, P_REP, P_REPE,
P_REPNE, P_REPNZ, P_REPZ, P_TIMES
};
enum { /* extended operand types */
EOT_NOTHING, EOT_DB_STRING, EOT_DB_NUMBER
};
enum { /* special EA flags */
EAF_BYTEOFFS = 1, /* force offset part to byte size */
EAF_WORDOFFS = 2, /* force offset part to [d]word size */
EAF_TIMESTWO = 4 /* really do EAX*2 not EAX+EAX */
};
enum { /* values for `hinttype' */
EAH_NOHINT = 0, /* no hint at all - our discretion */
EAH_MAKEBASE = 1, /* try to make given reg the base */
EAH_NOTBASE = 2 /* try _not_ to make reg the base */
};
typedef struct { /* operand to an instruction */
long type; /* type of operand */
int addr_size; /* 0 means default; 16; 32 */
int basereg, indexreg, scale; /* registers and scale involved */
int hintbase, hinttype; /* hint as to real base register */
long segment; /* immediate segment, if needed */
long offset; /* any immediate number */
long wrt; /* segment base it's relative to */
int eaflags; /* special EA flags */
} operand;
typedef struct extop { /* extended operand */
struct extop *next; /* linked list */
long type; /* defined above */
char *stringval; /* if it's a string, then here it is */
int stringlen; /* ... and here's how long it is */
long segment; /* if it's a number/address, then... */
long offset; /* ... it's given here ... */
long wrt; /* ... and here */
} extop;
#define MAXPREFIX 4
typedef struct { /* an instruction itself */
char *label; /* the label defined, or NULL */
int prefixes[MAXPREFIX]; /* instruction prefixes, if any */
int nprefix; /* number of entries in above */
int opcode; /* the opcode - not just the string */
int condition; /* the condition code, if Jcc/SETcc */
int operands; /* how many operands? 0-3 */
operand oprs[3]; /* the operands, defined as above */
extop *eops; /* extended operands */
long times; /* repeat count (TIMES prefix) */
int forw_ref; /* is there a forward reference? */
} insn;
/*
* ------------------------------------------------------------
* The data structure defining an output format driver, and the
* interfaces to the functions therein.
* ------------------------------------------------------------
*/
struct ofmt {
/*
* This is a short (one-liner) description of the type of
* output generated by the driver.
*/
char *fullname;
/*
* This is a single keyword used to select the driver.
*/
char *shortname;
/*
* This, if non-NULL, is a NULL-terminated list of `char *'s
* pointing to extra standard macros supplied by the object
* format (e.g. a sensible initial default value of __SECT__,
* and user-level equivalents for any format-specific
* directives).
*/
char **stdmac;
/*
* This procedure is called at the start of an output session.
* It tells the output format what file it will be writing to,
* what routine to report errors through, and how to interface
* to the label manager and expression evaluator if necessary.
* It also gives it a chance to do other initialisation.
*/
void (*init) (FILE *fp, efunc error, ldfunc ldef, evalfunc eval);
/*
* This procedure is called by assemble() to write actual
* generated code or data to the object file. Typically it
* doesn't have to actually _write_ it, just store it for
* later.
*
* The `type' argument specifies the type of output data, and
* usually the size as well: its contents are described below.
*/
void (*output) (long segto, void *data, unsigned long type,
long segment, long wrt);
/*
* This procedure is called once for every symbol defined in
* the module being assembled. It gives the name and value of
* the symbol, in NASM's terms, and indicates whether it has
* been declared to be global. Note that the parameter "name",
* when passed, will point to a piece of static storage
* allocated inside the label manager - it's safe to keep using
* that pointer, because the label manager doesn't clean up
* until after the output driver has.
*
* Values of `is_global' are: 0 means the symbol is local; 1
* means the symbol is global; 2 means the symbol is common (in
* which case `offset' holds the _size_ of the variable).
* Anything else is available for the output driver to use
* internally.
*
* This routine explicitly _is_ allowed to call the label
* manager to define further symbols, if it wants to, even
* though it's been called _from_ the label manager. That much
* re-entrancy is guaranteed in the label manager. However, the
* label manager will in turn call this routine, so it should
* be prepared to be re-entrant itself.
*
* The `special' parameter contains special information passed
* through from the command that defined the label: it may have
* been an EXTERN, a COMMON or a GLOBAL. The distinction should
* be obvious to the output format from the other parameters.
*/
void (*symdef) (char *name, long segment, long offset, int is_global,
char *special);
/*
* This procedure is called when the source code requests a
* segment change. It should return the corresponding segment
* _number_ for the name, or NO_SEG if the name is not a valid
* segment name.
*
* It may also be called with NULL, in which case it is to
* return the _default_ section number for starting assembly in.
*
* It is allowed to modify the string it is given a pointer to.
*
* It is also allowed to specify a default instruction size for
* the segment, by setting `*bits' to 16 or 32. Or, if it
* doesn't wish to define a default, it can leave `bits' alone.
*/
long (*section) (char *name, int pass, int *bits);
/*
* This procedure is called to modify the segment base values
* returned from the SEG operator. It is given a segment base
* value (i.e. a segment value with the low bit set), and is
* required to produce in return a segment value which may be
* different. It can map segment bases to absolute numbers by
* means of returning SEG_ABS types.
*
* It should return NO_SEG if the segment base cannot be
* determined; the evaluator (which calls this routine) is
* responsible for throwing an error condition if that occurs
* in pass two or in a critical expression.
*/
long (*segbase) (long segment);
/*
* This procedure is called to allow the output driver to
* process its own specific directives. When called, it has the
* directive word in `directive' and the parameter string in
* `value'. It is called in both assembly passes, and `pass'
* will be either 1 or 2.
*
* This procedure should return zero if it does not _recognise_
* the directive, so that the main program can report an error.
* If it recognises the directive but then has its own errors,
* it should report them itself and then return non-zero. It
* should also return non-zero if it correctly processes the
* directive.
*/
int (*directive) (char *directive, char *value, int pass);
/*
* This procedure is called before anything else - even before
* the "init" routine - and is passed the name of the input
* file from which this output file is being generated. It
* should return its preferred name for the output file in
* `outname', if outname[0] is not '\0', and do nothing to
* `outname' otherwise. Since it is called before the driver is
* properly initialised, it has to be passed its error handler
* separately.
*
* This procedure may also take its own copy of the input file
* name for use in writing the output file: it is _guaranteed_
* that it will be called before the "init" routine.
*
* The parameter `outname' points to an area of storage
* guaranteed to be at least FILENAME_MAX in size.
*/
void (*filename) (char *inname, char *outname, efunc error);
/*
* This procedure is called after assembly finishes, to allow
* the output driver to clean itself up and free its memory.
* Typically, it will also be the point at which the object
* file actually gets _written_.
*
* One thing the cleanup routine should always do is to close
* the output file pointer.
*/
void (*cleanup) (void);
};
/*
* values for the `type' parameter to an output function. Each one
* must have the actual number of _bytes_ added to it.
*
* Exceptions are OUT_RELxADR, which denote an x-byte relocation
* which will be a relative jump. For this we need to know the
* distance in bytes from the start of the relocated record until
* the end of the containing instruction. _This_ is what is stored
* in the size part of the parameter, in this case.
*
* Also OUT_RESERVE denotes reservation of N bytes of BSS space,
* and the contents of the "data" parameter is irrelevant.
*
* The "data" parameter for the output function points to a "long",
* containing the address in question, unless the type is
* OUT_RAWDATA, in which case it points to an "unsigned char"
* array.
*/
#define OUT_RAWDATA 0x00000000UL
#define OUT_ADDRESS 0x10000000UL
#define OUT_REL2ADR 0x20000000UL
#define OUT_REL4ADR 0x30000000UL
#define OUT_RESERVE 0x40000000UL
#define OUT_TYPMASK 0xF0000000UL
#define OUT_SIZMASK 0x0FFFFFFFUL
/*
* -----
* Other
* -----
*/
/*
* This is a useful #define which I keep meaning to use more often:
* the number of elements of a statically defined array.
*/
#define elements(x) ( sizeof(x) / sizeof(*(x)) )
#endif
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