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290b4cb3a4
nasm/nasm.h
H. Peter Anvin 290b4cb3a4 eval: add general support for "integer functions" and add ilog2*() 
Add general support in the function parser for "integer functions"
(actually implemented as special unary operators, then wrapped in
macros) and implement a family of integer logarithms.  The only
difference is the behavior on a non-power-of-two argument:

	ilog2[e]	-- throw an error
	ilog2w		-- throw a warning
	ilog2f		-- round down to power of 2
	ilog2c		-- round up to power of 2

This is useful for back-converting from masks to bit values.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2012-05-31 10:25:37 -07:00

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/* ----------------------------------------------------------------------- *
*
* Copyright 1996-2012 The NASM Authors - All Rights Reserved
* See the file AUTHORS included with the NASM distribution for
* the specific copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ----------------------------------------------------------------------- */
/*
* nasm.h main header file for the Netwide Assembler: inter-module interface
*/
#ifndef NASM_NASM_H
#define NASM_NASM_H
#include "compiler.h"
#include <stdio.h>
#include <inttypes.h>
#include "nasmlib.h"
#include "preproc.h"
#include "insnsi.h" /* For enum opcode */
#include "directiv.h" /* For enum directive */
#include "opflags.h"
#include "regs.h"
#define NO_SEG -1L /* null segment value */
#define SEG_ABS 0x40000000L /* mask for far-absolute segments */
#ifndef FILENAME_MAX
#define FILENAME_MAX 256
#endif
#ifndef PREFIX_MAX
#define PREFIX_MAX 10
#endif
#ifndef POSTFIX_MAX
#define POSTFIX_MAX 10
#endif
#define IDLEN_MAX 4096
/*
* 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;
/*
* Values for the `type' parameter to an output function.
*
* 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 "int32_t",
* containing the address in question, unless the type is
* OUT_RAWDATA, in which case it points to an "uint8_t"
* array.
*/
enum out_type {
OUT_RAWDATA, /* Plain bytes */
OUT_ADDRESS, /* An address (symbol value) */
OUT_RESERVE, /* Reserved bytes (RESB et al) */
OUT_REL1ADR, /* 1-byte relative address */
OUT_REL2ADR, /* 2-byte relative address */
OUT_REL4ADR, /* 4-byte relative address */
OUT_REL8ADR, /* 8-byte relative address */
};
/*
* A label-lookup function.
*/
typedef bool (*lfunc)(char *label, int32_t *segment, int64_t *offset);
/*
* And a label-definition function. 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, int32_t segment, int64_t offset,
char *special, bool is_norm, bool isextrn);
void define_label(char *label, int32_t segment, int64_t offset,
char *special, bool is_norm, bool isextrn);
/*
* List-file generators should look like this:
*/
typedef struct {
/*
* Called to initialize 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 *fname, efunc error);
/*
* 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)(int32_t offset, const void *data, enum out_type type, uint64_t size);
/*
* 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 type, char *line);
/*
* 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 type);
/*
* Reverse the effects of uplevel.
*/
void (*downlevel)(int type);
/*
* Called on a warning or error, with the error message.
*/
void (*error)(int severity, const char *pfx, const char *msg);
} ListGen;
/*
* Token types returned by the scanner, in addition to ordinary
* ASCII character values, and zero for end-of-string.
*/
enum token_type { /* 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, /* identifier */
TOKEN_NUM, /* numeric constant */
TOKEN_ERRNUM, /* malformed numeric constant */
TOKEN_STR, /* string constant */
TOKEN_ERRSTR, /* unterminated string constant */
TOKEN_FLOAT, /* floating-point constant */
TOKEN_REG, /* register name */
TOKEN_INSN, /* instruction name */
TOKEN_HERE, /* $ */
TOKEN_BASE, /* $$ */
TOKEN_SPECIAL, /* BYTE, WORD, DWORD, QWORD, FAR, NEAR, etc */
TOKEN_PREFIX, /* A32, O16, LOCK, REPNZ, TIMES, etc */
TOKEN_SHL, /* << */
TOKEN_SHR, /* >> */
TOKEN_SDIV, /* // */
TOKEN_SMOD, /* %% */
TOKEN_GE, /* >= */
TOKEN_LE, /* <= */
TOKEN_NE, /* <> (!= is same as <>) */
TOKEN_DBL_AND, /* && */
TOKEN_DBL_OR, /* || */
TOKEN_DBL_XOR, /* ^^ */
TOKEN_SEG, /* SEG */
TOKEN_WRT, /* WRT */
TOKEN_FLOATIZE, /* __floatX__ */
TOKEN_STRFUNC, /* __utf16*__, __utf32*__ */
TOKEN_IFUNC, /* __ilog2*__ */
};
enum floatize {
FLOAT_8,
FLOAT_16,
FLOAT_32,
FLOAT_64,
FLOAT_80M,
FLOAT_80E,
FLOAT_128L,
FLOAT_128H,
};
/* Must match the list in string_transform(), in strfunc.c */
enum strfunc {
STRFUNC_UTF16,
STRFUNC_UTF16LE,
STRFUNC_UTF16BE,
STRFUNC_UTF32,
STRFUNC_UTF32LE,
STRFUNC_UTF32BE,
};
enum ifunc {
IFUNC_ILOG2E,
IFUNC_ILOG2W,
IFUNC_ILOG2F,
IFUNC_ILOG2C,
};
size_t string_transform(char *, size_t, char **, enum strfunc);
/*
* 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 {
char *t_charptr;
int64_t t_integer;
int64_t t_inttwo;
enum token_type t_type;
};
typedef int (*scanner)(void *private_data, struct tokenval *tv);
struct location {
int64_t offset;
int32_t segment;
int known;
};
/*
* 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 {
int32_t type; /* a register, or EXPR_xxx */
int64_t value; /* must be >= 32 bits */
} expr;
/*
* Library routines to manipulate expression data types.
*/
int is_reloc(expr *vect);
int is_simple(expr *vect);
int is_really_simple(expr *vect);
int is_unknown(expr *vect);
int is_just_unknown(expr *vect);
int64_t reloc_value(expr *vect);
int32_t reloc_seg(expr *vect);
int32_t reloc_wrt(expr *vect);
/*
* 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 {
int64_t 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 8 set (in addition to its main value: 0x101
* and 0x102 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.
*/
#define CRITICAL 0x100
typedef expr *(*evalfunc)(scanner sc, void *scprivate,
struct tokenval *tv, int *fwref, int critical,
efunc error, struct eval_hints *hints);
/*
* Special values for expr->type.
* These come after EXPR_REG_END as defined in regs.h.
*/
#define EXPR_UNKNOWN (EXPR_REG_END+1) /* forward references */
#define EXPR_SIMPLE (EXPR_REG_END+2)
#define EXPR_WRT (EXPR_REG_END+3)
#define EXPR_SEGBASE (EXPR_REG_END+4)
/*
* Linked list of strings
*/
typedef struct string_list {
struct string_list *next;
char str[1];
} StrList;
/*
* preprocessors ought to look like this:
*/
struct preproc_ops {
/*
* 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 *file, int pass, ListGen *listgen, StrList **deplist);
/*
* 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)(int pass);
/* Additional macros specific to output format */
void (*extra_stdmac)(macros_t *macros);
/* Early definitions and undefinitions for macros */
void (*pre_define)(char *definition);
void (*pre_undefine)(char *definition);
/* Include file from command line */
void (*pre_include)(char *fname);
/* Include path from command line */
void (*include_path)(char *path);
};
extern struct preproc_ops nasmpp;
extern struct preproc_ops preproc_nop;
/*
* 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) (nasm_isalpha(c) || \
(c) == '_' || \
(c) == '.' || \
(c) == '?' || \
(c) == '@')
#define isidchar(c) (isidstart(c) || \
nasm_isdigit(c) || \
(c) == '$' || \
(c) == '#' || \
(c) == '~')
/* Ditto for numeric constants. */
#define isnumstart(c) (nasm_isdigit(c) || (c) == '$')
#define isnumchar(c) (nasm_isalnum(c) || (c) == '_')
/*
* 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'
* -----------------------------------------------------------
*/
/* Verify value to be a valid register */
static inline bool is_register(int reg)
{
return reg >= EXPR_REG_START && reg < REG_ENUM_LIMIT;
}
enum ccode { /* 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,
C_none = -1
};
/*
* REX flags
*/
#define REX_REAL 0x4f /* Actual REX prefix bits */
#define REX_B 0x01 /* ModRM r/m extension */
#define REX_X 0x02 /* SIB index extension */
#define REX_R 0x04 /* ModRM reg extension */
#define REX_W 0x08 /* 64-bit operand size */
#define REX_L 0x20 /* Use LOCK prefix instead of REX.R */
#define REX_P 0x40 /* REX prefix present/required */
#define REX_H 0x80 /* High register present, REX forbidden */
#define REX_V 0x0100 /* Instruction uses VEX/XOP instead of REX */
#define REX_NH 0x0200 /* Instruction which doesn't use high regs */
/*
* REX_V "classes" (prefixes which behave like VEX)
*/
enum vex_class {
RV_VEX = 0, /* C4/C5 */
RV_XOP = 1 /* 8F */
};
/*
* 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 prefixes { /* instruction prefixes */
P_none = 0,
PREFIX_ENUM_START = REG_ENUM_LIMIT,
P_A16 = PREFIX_ENUM_START, P_A32, P_A64, P_ASP,
P_LOCK, P_O16, P_O32, P_O64, P_OSP,
P_REP, P_REPE, P_REPNE, P_REPNZ, P_REPZ, P_TIMES,
P_WAIT, P_XACQUIRE, P_XRELEASE,
PREFIX_ENUM_LIMIT
};
enum extop_type { /* extended operand types */
EOT_NOTHING,
EOT_DB_STRING, /* Byte string */
EOT_DB_STRING_FREE, /* Byte string which should be nasm_free'd*/
EOT_DB_NUMBER, /* Integer */
};
enum ea_flags { /* 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 */
EAF_REL = 8, /* IP-relative addressing */
EAF_ABS = 16, /* non-IP-relative addressing */
EAF_FSGS = 32 /* fs/gs segment override present */
};
enum eval_hint { /* 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 { /* operand to an instruction */
opflags_t type; /* type of operand */
int disp_size; /* 0 means default; 16; 32; 64 */
enum reg_enum basereg;
enum reg_enum indexreg; /* address registers */
int scale; /* index scale */
int hintbase;
enum eval_hint hinttype; /* hint as to real base register */
int32_t segment; /* immediate segment, if needed */
int64_t offset; /* any immediate number */
int32_t wrt; /* segment base it's relative to */
int eaflags; /* special EA flags */
int opflags; /* see OPFLAG_* defines below */
} operand;
#define OPFLAG_FORWARD 1 /* operand is a forward reference */
#define OPFLAG_EXTERN 2 /* operand is an external reference */
#define OPFLAG_UNKNOWN 4 /* operand is an unknown reference
* (always a forward reference also)
*/
typedef struct extop { /* extended operand */
struct extop *next; /* linked list */
char *stringval; /* if it's a string, then here it is */
size_t stringlen; /* ... and here's how long it is */
int64_t offset; /* ... it's given here ... */
int32_t segment; /* if it's a number/address, then... */
int32_t wrt; /* ... and here */
enum extop_type type; /* defined above */
} extop;
enum ea_type {
EA_INVALID, /* Not a valid EA at all */
EA_SCALAR, /* Scalar EA */
EA_XMMVSIB, /* XMM vector EA */
EA_YMMVSIB, /* XMM vector EA */
};
/*
* Prefix positions: each type of prefix goes in a specific slot.
* This affects the final ordering of the assembled output, which
* shouldn't matter to the processor, but if you have stylistic
* preferences, you can change this. REX prefixes are handled
* differently for the time being.
*
* LOCK and REP used to be one slot; this is no longer the case since
* the introduction of HLE.
*/
enum prefix_pos {
PPS_WAIT, /* WAIT (technically not a prefix!) */
PPS_REP, /* REP/HLE prefix */
PPS_LOCK, /* LOCK prefix */
PPS_SEG, /* Segment override prefix */
PPS_OSIZE, /* Operand size prefix */
PPS_ASIZE, /* Address size prefix */
MAXPREFIX /* Total number of prefix slots */
};
/* If you need to change this, also change it in insns.pl */
#define MAX_OPERANDS 5
typedef struct insn { /* an instruction itself */
char *label; /* the label defined, or NULL */
int prefixes[MAXPREFIX]; /* instruction prefixes, if any */
enum opcode opcode; /* the opcode - not just the string */
enum ccode condition; /* the condition code, if Jcc/SETcc */
int operands; /* how many operands? 0-3 (more if db et al) */
int addr_size; /* address size */
operand oprs[MAX_OPERANDS]; /* the operands, defined as above */
extop *eops; /* extended operands */
int eops_float; /* true if DD and floating */
int32_t times; /* repeat count (TIMES prefix) */
bool forw_ref; /* is there a forward reference? */
int rex; /* Special REX Prefix */
int vexreg; /* Register encoded in VEX prefix */
int vex_cm; /* Class and M field for VEX prefix */
int vex_wlp; /* W, P and L information for VEX prefix */
} insn;
enum geninfo { GI_SWITCH };
/*
* 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.
*/
const char *fullname;
/*
* This is a single keyword used to select the driver.
*/
const char *shortname;
/*
* Output format flags.
*/
#define OFMT_TEXT 1 /* Text file format */
unsigned int flags;
/*
* this is a pointer to the first element of the debug information
*/
struct dfmt **debug_formats;
/*
* and a pointer to the element that is being used
* note: this is set to the default at compile time and changed if the
* -F option is selected. If developing a set of new debug formats for
* an output format, be sure to set this to whatever default you want
*
*/
const struct dfmt *current_dfmt;
/*
* 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).
*/
macros_t *stdmac;
/*
* This procedure is called at the start of an output session to set
* up internal parameters.
*/
void (*init)(void);
/*
* This procedure is called to pass generic information to the
* object file. The first parameter gives the information type
* (currently only command line switches)
* and the second parameter gives the value. This function returns
* 1 if recognized, 0 if unrecognized
*/
int (*setinfo)(enum geninfo type, char **string);
/*
* 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)(int32_t segto, const void *data,
enum out_type type, uint64_t size,
int32_t segment, int32_t 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, int32_t segment, int64_t 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.
*/
int32_t (*section)(char *name, int pass, int *bits);
/*
* This procedure is called to modify section alignment,
* note there is a trick, the alignment can only increase
*/
void (*sectalign)(int32_t seg, unsigned int value);
/*
* 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.
*/
int32_t (*segbase)(int32_t 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)(enum directives 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 initialized, 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);
/*
* 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)(int debuginfo);
};
/*
* Output format driver alias
*/
struct ofmt_alias {
const char *shortname;
const char *fullname;
struct ofmt *ofmt;
};
extern struct ofmt *ofmt;
extern FILE *ofile;
/*
* ------------------------------------------------------------
* The data structure defining a debug format driver, and the
* interfaces to the functions therein.
* ------------------------------------------------------------
*/
struct dfmt {
/*
* This is a short (one-liner) description of the type of
* output generated by the driver.
*/
const char *fullname;
/*
* This is a single keyword used to select the driver.
*/
const char *shortname;
/*
* init - called initially to set up local pointer to object format.
*/
void (*init)(void);
/*
* linenum - called any time there is output with a change of
* line number or file.
*/
void (*linenum)(const char *filename, int32_t linenumber, int32_t segto);
/*
* debug_deflabel - called whenever a label is defined. Parameters
* are the same as to 'symdef()' in the output format. This function
* would be called before the output format version.
*/
void (*debug_deflabel)(char *name, int32_t segment, int64_t offset,
int is_global, char *special);
/*
* debug_directive - called whenever a DEBUG directive other than 'LINE'
* is encountered. 'directive' contains the first parameter to the
* DEBUG directive, and params contains the rest. For example,
* 'DEBUG VAR _somevar:int' would translate to a call to this
* function with 'directive' equal to "VAR" and 'params' equal to
* "_somevar:int".
*/
void (*debug_directive)(const char *directive, const char *params);
/*
* typevalue - called whenever the assembler wishes to register a type
* for the last defined label. This routine MUST detect if a type was
* already registered and not re-register it.
*/
void (*debug_typevalue)(int32_t type);
/*
* debug_output - called whenever output is required
* 'type' is the type of info required, and this is format-specific
*/
void (*debug_output)(int type, void *param);
/*
* cleanup - called after processing of file is complete
*/
void (*cleanup)(void);
};
extern const struct dfmt *dfmt;
/*
* The type definition macros
* for debugging
*
* low 3 bits: reserved
* next 5 bits: type
* next 24 bits: number of elements for arrays (0 for labels)
*/
#define TY_UNKNOWN 0x00
#define TY_LABEL 0x08
#define TY_BYTE 0x10
#define TY_WORD 0x18
#define TY_DWORD 0x20
#define TY_FLOAT 0x28
#define TY_QWORD 0x30
#define TY_TBYTE 0x38
#define TY_OWORD 0x40
#define TY_YWORD 0x48
#define TY_COMMON 0xE0
#define TY_SEG 0xE8
#define TY_EXTERN 0xF0
#define TY_EQU 0xF8
#define TYM_TYPE(x) ((x) & 0xF8)
#define TYM_ELEMENTS(x) (((x) & 0xFFFFFF00) >> 8)
#define TYS_ELEMENTS(x) ((x) << 8)
enum special_tokens {
SPECIAL_ENUM_START = PREFIX_ENUM_LIMIT,
S_ABS = SPECIAL_ENUM_START,
S_BYTE,
S_DWORD,
S_FAR,
S_LONG,
S_NEAR,
S_NOSPLIT,
S_OWORD,
S_QWORD,
S_REL,
S_SHORT,
S_STRICT,
S_TO,
S_TWORD,
S_WORD,
S_YWORD,
SPECIAL_ENUM_LIMIT
};
/*
* Global modes
*/
/*
* This declaration passes the "pass" number to all other modules
* "pass0" assumes the values: 0, 0, ..., 0, 1, 2
* where 0 = optimizing pass
* 1 = pass 1
* 2 = pass 2
*/
extern int pass0;
extern int passn; /* Actual pass number */
extern bool tasm_compatible_mode;
extern int optimizing;
extern int globalbits; /* 16, 32 or 64-bit mode */
extern int globalrel; /* default to relative addressing? */
extern int maxbits; /* max bits supported by output */
/*
* NASM version strings, defined in ver.c
*/
extern const char nasm_version[];
extern const char nasm_date[];
extern const char nasm_compile_options[];
extern const char nasm_comment[];
extern const char nasm_signature[];
#endif
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