/* ----------------------------------------------------------------------- * * * Copyright 1996-2018 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 #include #include "nasmlib.h" #include "strlist.h" #include "preproc.h" #include "insnsi.h" /* For enum opcode */ #include "directiv.h" /* For enum directive */ #include "labels.h" /* For enum mangle_index, enum label_type */ #include "opflags.h" #include "regs.h" /* Time stamp for the official start of compilation */ struct compile_time { time_t t; bool have_local, have_gm, have_posix; int64_t posix; struct tm local; struct tm gm; }; extern struct compile_time official_compile_time; #define NO_SEG INT32_C(-1) /* null segment value */ #define SEG_ABS 0x40000000L /* mask for far-absolute segments */ #ifndef PREFIX_MAX #define PREFIX_MAX 10 #endif #ifndef POSTFIX_MAX #define POSTFIX_MAX 10 #endif #define IDLEN_MAX 4096 #define DECOLEN_MAX 32 /* * Name pollution problems: 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. */ enum out_type { OUT_RAWDATA, /* Plain bytes */ OUT_RESERVE, /* Reserved bytes (RESB et al) */ OUT_ZERODATA, /* Initialized data, but all zero */ OUT_ADDRESS, /* An address (symbol value) */ OUT_RELADDR, /* A relative address */ OUT_SEGMENT, /* A segment number */ /* * These values are used by the legacy backend interface only; * see output/legacy.c for more information. These should never * be used otherwise. Once all backends have been migrated to the * new interface they should be removed. */ OUT_REL1ADR, OUT_REL2ADR, OUT_REL4ADR, OUT_REL8ADR }; enum out_sign { OUT_WRAP, /* Undefined signedness (wraps) */ OUT_SIGNED, /* Value is signed */ OUT_UNSIGNED /* Value is unsigned */ }; /* * The data we send down to the backend. * XXX: We still want to push down the base address symbol if * available, and replace the segment numbers with a structure. */ struct out_data { int64_t offset; /* Offset within segment */ int32_t segment; /* Segment written to */ enum out_type type; /* See above */ enum out_sign sign; /* See above */ int inslen; /* Length of instruction */ int insoffs; /* Offset inside instruction */ int bits; /* Bits mode of compilation */ uint64_t size; /* Size of output */ const struct itemplate *itemp; /* Instruction template */ const void *data; /* Data for OUT_RAWDATA */ uint64_t toffset; /* Target address offset for relocation */ int32_t tsegment; /* Target segment for relocation */ int32_t twrt; /* Relocation with respect to */ int64_t relbase; /* Relative base for OUT_RELADDR */ }; /* * 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); /* * 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*__ */ TOKEN_DECORATOR, /* decorators such as {...} */ TOKEN_OPMASK /* translated token for opmask registers */ }; 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; int8_t t_flag; }; typedef int (*scanner)(void *private_data, struct tokenval *tv); struct location { int64_t offset; int32_t segment; int known; }; extern struct location location; /* * 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. */ bool is_reloc(const expr *vect); bool is_simple(const expr *vect); bool is_really_simple(const expr *vect); bool is_unknown(const expr *vect); bool is_just_unknown(const expr *vect); int64_t reloc_value(const expr *vect); int32_t reloc_seg(const expr *vect); int32_t reloc_wrt(const expr *vect); bool is_self_relative(const expr *vect); void dump_expr(const 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, struct eval_hints *hints); /* * Special values for expr->type. * These come after EXPR_REG_END as defined in regs.h. * Expr types : 0 ~ EXPR_REG_END, EXPR_UNKNOWN, EXPR_...., EXPR_RDSAE, * EXPR_SEGBASE ~ EXPR_SEGBASE + SEG_ABS, ... */ #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_RDSAE (EXPR_REG_END+4) #define EXPR_SEGBASE (EXPR_REG_END+5) /* * preprocessors ought to look like this: */ struct preproc_ops { /* * Called once at the very start of assembly. */ void (*init)(void); /* * 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)(const char *file, int pass, 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); /* Add a command from the command line */ void (*pre_command)(const char *what, char *str); /* Include path from command line */ void (*include_path)(char *path); /* Unwind the macro stack when printing an error message */ void (*error_list_macros)(int severity); }; extern const struct preproc_ops nasmpp; extern const struct preproc_ops preproc_nop; /* List of dependency files */ extern StrList *depend_list; /* * 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. * isbrcchar matches any character that may placed inside curly braces as a * decorator. E.g. {rn-sae}, {1to8}, {k1}{z} */ #define isidstart(c) (nasm_isalpha(c) || \ (c) == '_' || \ (c) == '.' || \ (c) == '?' || \ (c) == '@') #define isidchar(c) (isidstart(c) || \ nasm_isdigit(c) || \ (c) == '$' || \ (c) == '#' || \ (c) == '~') #define isbrcchar(c) (isidchar(c) || \ (c) == '-') /* Ditto for numeric constants. */ #define isnumstart(c) (nasm_isdigit(c) || (c) == '$') #define isnumchar(c) (nasm_isalnum(c) || (c) == '_') /* * inline function to skip past an identifier; returns the first character past * the identifier if valid, otherwise NULL. */ static inline char *nasm_skip_identifier(const char *str) { const char *p = str; if (!isidstart(*p++)) { p = NULL; } else { while (isidchar(*p++)) ; } return (char *)p; } /* * 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 }; /* * token flags */ #define TFLAG_BRC (1 << 0) /* valid only with braces. {1to8}, {rd-sae}, ...*/ #define TFLAG_BRC_OPT (1 << 1) /* may or may not have braces. opmasks {k1} */ #define TFLAG_BRC_ANY (TFLAG_BRC | TFLAG_BRC_OPT) #define TFLAG_BRDCAST (1 << 2) /* broadcasting decorator */ #define TFLAG_WARN (1 << 3) /* warning only, treat as ID */ static inline uint8_t get_cond_opcode(enum ccode c) { static const uint8_t ccode_opcodes[] = { 0x7, 0x3, 0x2, 0x6, 0x2, 0x4, 0xf, 0xd, 0xc, 0xe, 0x6, 0x2, 0x3, 0x7, 0x3, 0x5, 0xe, 0xc, 0xd, 0xf, 0x1, 0xb, 0x9, 0x5, 0x0, 0xa, 0xa, 0xb, 0x8, 0x4 }; return ccode_opcodes[(int)c]; } /* * REX flags */ #define REX_MASK 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 */ #define REX_EV 0x0400 /* Instruction uses EVEX instead of REX */ /* * EVEX bit field */ #define EVEX_P0MM 0x0f /* EVEX P[3:0] : Opcode map */ #define EVEX_P0RP 0x10 /* EVEX P[4] : High-16 reg */ #define EVEX_P0X 0x40 /* EVEX P[6] : High-16 rm */ #define EVEX_P1PP 0x03 /* EVEX P[9:8] : Legacy prefix */ #define EVEX_P1VVVV 0x78 /* EVEX P[14:11] : NDS register */ #define EVEX_P1W 0x80 /* EVEX P[15] : Osize extension */ #define EVEX_P2AAA 0x07 /* EVEX P[18:16] : Embedded opmask */ #define EVEX_P2VP 0x08 /* EVEX P[19] : High-16 NDS reg */ #define EVEX_P2B 0x10 /* EVEX P[20] : Broadcast / RC / SAE */ #define EVEX_P2LL 0x60 /* EVEX P[22:21] : Vector length */ #define EVEX_P2RC EVEX_P2LL /* EVEX P[22:21] : Rounding control */ #define EVEX_P2Z 0x80 /* EVEX P[23] : Zeroing/Merging */ /* * REX_V "classes" (prefixes which behave like VEX) */ enum vex_class { RV_VEX = 0, /* C4/C5 */ RV_XOP = 1, /* 8F */ RV_EVEX = 2 /* 62 */ }; /* * 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, P_BND, P_NOBND, P_EVEX, P_VEX3, P_VEX2, 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 */ EAF_MIB = 64 /* mib operand */ }; 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 */ EAH_SUMMED = 3 /* base and index are summed into index */ }; 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 */ decoflags_t decoflags; /* decorator flags such as {...} */ } 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) */ #define OPFLAG_RELATIVE 8 /* operand is self-relative, e.g. [foo - $] where foo is not in the current segment */ 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 */ bool relative; /* self-relative expression */ 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, /* YMM vector EA */ EA_ZMMVSIB /* ZMM 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 */ PPS_VEX, /* VEX type */ MAXPREFIX /* Total number of prefix slots */ }; /* * Tuple types that are used when determining Disp8*N eligibility * The order must match with a hash %tuple_codes in insns.pl */ enum ttypes { FV = 001, HV = 002, FVM = 003, T1S8 = 004, T1S16 = 005, T1S = 006, T1F32 = 007, T1F64 = 010, T2 = 011, T4 = 012, T8 = 013, HVM = 014, QVM = 015, OVM = 016, M128 = 017, DUP = 020 }; /* EVEX.L'L : Vector length on vector insns */ enum vectlens { VL128 = 0, VL256 = 1, VL512 = 2, VLMAX = 3 }; /* 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? */ bool rex_done; /* REX prefix emitted? */ 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 */ uint8_t evex_p[3]; /* EVEX.P0: [RXB,R',00,mm], P1: [W,vvvv,1,pp] */ /* EVEX.P2: [z,L'L,b,V',aaa] */ enum ttypes evex_tuple; /* Tuple type for compressed Disp8*N */ int evex_rm; /* static rounding mode for AVX512 (EVEX) */ int8_t evex_brerop; /* BR/ER/SAE operand position */ } insn; /* Instruction flags type: IF_* flags are defined in insns.h */ typedef uint64_t iflags_t; /* * What to return from a directive- or pragma-handling function. * Currently DIRR_OK and DIRR_ERROR are treated the same way; * in both cases the backend is expected to produce the appropriate * error message on its own. * * DIRR_BADPARAM causes a generic error message to be printed. Note * that it is an error, not a warning, even in the case of pragmas; * don't use it where forward compatiblity would be compromised * (instead consider adding a DIRR_WARNPARAM.) */ enum directive_result { DIRR_UNKNOWN, /* Directive not handled by backend */ DIRR_OK, /* Directive processed */ DIRR_ERROR, /* Directive processed unsuccessfully */ DIRR_BADPARAM /* Print bad argument error message */ }; /* * A pragma facility: this structure is used to request passing a * parsed pragma directive for a specific facility. If the handler is * NULL then this pragma facility is recognized but ignored; pragma * processing stops at that point. * * Note that the handler is passed a pointer to the facility structure * as part of the struct pragma. */ struct pragma; struct pragma_facility { const char *name; enum directive_result (*handler)(const struct pragma *); }; /* * This structure defines how a pragma directive is passed to a * facility. This structure may be augmented in the future. * * Any facility MAY, but is not required to, add its operations * keywords or a subset thereof into asm/directiv.dat, in which case * the "opcode" field will be set to the corresponding D_ constant * from directiv.h; otherwise it will be D_unknown. */ struct pragma { const struct pragma_facility *facility; const char *facility_name; /* Facility name exactly as entered by user */ const char *opname; /* First word after the facility name */ const char *tail; /* Anything after the operation */ enum directive opcode; /* Operation as a D_ directives constant */ }; /* * These are semi-arbitrary limits to keep the assembler from going * into a black hole on certain kinds of bugs. They can be overridden * by command-line options or %pragma. */ enum nasm_limit { LIMIT_PASSES, LIMIT_STALLED, LIMIT_MACROS, LIMIT_REP, LIMIT_EVAL }; #define LIMIT_MAX LIMIT_EVAL extern int nasm_limit[LIMIT_MAX+1]; extern enum directive_result nasm_set_limit(const char *, const char *); /* * 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; /* * Default output filename extension, or a null string */ const char *extension; /* * Output format flags. */ #define OFMT_TEXT 1 /* Text file format */ #define OFMT_KEEP_ADDR 2 /* Keep addr; no conversion to data */ unsigned int flags; int maxbits; /* Maximum segment bits supported */ /* * this is a pointer to the first element of the debug information */ const struct dfmt * const *debug_formats; /* * the default debugging format if -F is not specified */ const struct dfmt *default_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 at the start of each pass. */ void (*reset)(void); /* * This is the modern output function, which gets passed * a struct out_data with much more information. See the * definition of struct out_data. */ void (*output)(const struct out_data *data); /* * 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. * * This is used for backends which have not yet been ported to * the new interface, and should be NULL on ported backends. * To use this entry point, set the output pointer to * nasm_do_legacy_output. */ void (*legacy_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 function is called when a label is defined * in the source code. It is allowed to change the section * number as a result, but not the bits value. * This is *only* called if the symbol defined is at the * current offset, i.e. "foo:" or "foo equ $". * The offset isn't passed; and may not be stable at this point. * The subsection number is a field available for use by the * backend. It is initialized to NO_SEG. */ int32_t (*herelabel)(const char *name, enum label_type type, int32_t seg, int32_t *subsection); /* * 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. * * The following values are (currently) possible for * directive_result: * * 0 - DIRR_UNKNOWN - directive not recognized by backend * 1 - DIRR_OK - directive processed ok * 2 - DIRR_ERROR - backend printed its own error message * 3 - DIRR_BADPARAM - print the generic message * "invalid parameter to [*] directive" */ enum directive_result (*directive)(enum directive directive, char *value, int pass); /* * 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); /* * List of pragma facility names that apply to this backend. */ const struct pragma_facility *pragmas; }; /* * Output format driver alias */ struct ofmt_alias { const char *shortname; const char *fullname; const struct ofmt *ofmt; }; extern const 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 * is called after 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); /* * List of pragma facility names that apply to this backend. */ const struct pragma_facility *pragmas; }; 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_ZWORD 0x50 #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, S_ZWORD, SPECIAL_ENUM_LIMIT }; enum decorator_tokens { DECORATOR_ENUM_START = SPECIAL_ENUM_LIMIT, BRC_1TO2 = DECORATOR_ENUM_START, BRC_1TO4, BRC_1TO8, BRC_1TO16, BRC_RN, BRC_RD, BRC_RU, BRC_RZ, BRC_SAE, BRC_Z, DECORATOR_ENUM_LIMIT }; /* * AVX512 Decorator (decoflags_t) bits distribution (counted from 0) * 3 2 1 * 10987654321098765432109876543210 * | * | word boundary * ............................1111 opmask * ...........................1.... zeroing / merging * ..........................1..... broadcast * .........................1...... static rounding * ........................1....... SAE * ......................11........ broadcast element size * ....................11.......... number of broadcast elements */ #define OP_GENVAL(val, bits, shift) (((val) & ((UINT64_C(1) << (bits)) - 1)) << (shift)) /* * Opmask register number * identical to EVEX.aaa * * Bits: 0 - 3 */ #define OPMASK_SHIFT (0) #define OPMASK_BITS (4) #define OPMASK_MASK OP_GENMASK(OPMASK_BITS, OPMASK_SHIFT) #define GEN_OPMASK(bit) OP_GENBIT(bit, OPMASK_SHIFT) #define VAL_OPMASK(val) OP_GENVAL(val, OPMASK_BITS, OPMASK_SHIFT) /* * zeroing / merging control available * matching to EVEX.z * * Bits: 4 */ #define Z_SHIFT (4) #define Z_BITS (1) #define Z_MASK OP_GENMASK(Z_BITS, Z_SHIFT) #define GEN_Z(bit) OP_GENBIT(bit, Z_SHIFT) /* * broadcast - Whether this operand can be broadcasted * * Bits: 5 */ #define BRDCAST_SHIFT (5) #define BRDCAST_BITS (1) #define BRDCAST_MASK OP_GENMASK(BRDCAST_BITS, BRDCAST_SHIFT) #define GEN_BRDCAST(bit) OP_GENBIT(bit, BRDCAST_SHIFT) /* * Whether this instruction can have a static rounding mode. * It goes with the last simd operand because the static rounding mode * decorator is located between the last simd operand and imm8 (if any). * * Bits: 6 */ #define STATICRND_SHIFT (6) #define STATICRND_BITS (1) #define STATICRND_MASK OP_GENMASK(STATICRND_BITS, STATICRND_SHIFT) #define GEN_STATICRND(bit) OP_GENBIT(bit, STATICRND_SHIFT) /* * SAE(Suppress all exception) available * * Bits: 7 */ #define SAE_SHIFT (7) #define SAE_BITS (1) #define SAE_MASK OP_GENMASK(SAE_BITS, SAE_SHIFT) #define GEN_SAE(bit) OP_GENBIT(bit, SAE_SHIFT) /* * Broadcasting element size. * * Bits: 8 - 9 */ #define BRSIZE_SHIFT (8) #define BRSIZE_BITS (2) #define BRSIZE_MASK OP_GENMASK(BRSIZE_BITS, BRSIZE_SHIFT) #define GEN_BRSIZE(bit) OP_GENBIT(bit, BRSIZE_SHIFT) #define BR_BITS32 GEN_BRSIZE(0) #define BR_BITS64 GEN_BRSIZE(1) /* * Number of broadcasting elements * * Bits: 10 - 11 */ #define BRNUM_SHIFT (10) #define BRNUM_BITS (2) #define BRNUM_MASK OP_GENMASK(BRNUM_BITS, BRNUM_SHIFT) #define VAL_BRNUM(val) OP_GENVAL(val, BRNUM_BITS, BRNUM_SHIFT) #define BR_1TO2 VAL_BRNUM(0) #define BR_1TO4 VAL_BRNUM(1) #define BR_1TO8 VAL_BRNUM(2) #define BR_1TO16 VAL_BRNUM(3) #define MASK OPMASK_MASK /* Opmask (k1 ~ 7) can be used */ #define Z Z_MASK #define B32 (BRDCAST_MASK|BR_BITS32) /* {1to16} : broadcast 32b * 16 to zmm(512b) */ #define B64 (BRDCAST_MASK|BR_BITS64) /* {1to8} : broadcast 64b * 8 to zmm(512b) */ #define ER STATICRND_MASK /* ER(Embedded Rounding) == Static rounding mode */ #define SAE SAE_MASK /* SAE(Suppress All Exception) */ /* * 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 globalbnd; /* default to using bnd prefix? */ extern const char *inname; /* primary input filename */ extern const char *outname; /* output filename */ /* * Switch to a different segment and return the current offset */ int64_t switch_segment(int32_t segment); #endif