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Add support for DZ and RESZ, document the ZWORD keyword
Add the DZ and RESZ pseudoinstructions and add ZWORD to the documentation. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
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H. Peter Anvin
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@ -1,6 +1,6 @@
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\# --------------------------------------------------------------------------
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\#
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\# Copyright 1996-2012 The NASM Authors - All Rights Reserved
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\# Copyright 1996-2013 The NASM Authors - All Rights Reserved
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\# See the file AUTHORS included with the NASM distribution for
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\# the specific copyright holders.
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\#
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@ -1264,18 +1264,18 @@ indicate what size of \i{memory operand} it refers to.
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Pseudo-instructions are things which, though not real x86 machine
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instructions, are used in the instruction field anyway because that's
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the most convenient place to put them. The current pseudo-instructions
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are \i\c{DB}, \i\c{DW}, \i\c{DD}, \i\c{DQ}, \i\c{DT}, \i\c{DO} and
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\i\c{DY}; their \i{uninitialized} counterparts \i\c{RESB}, \i\c{RESW},
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\i\c{RESD}, \i\c{RESQ}, \i\c{REST}, \i\c{RESO} and \i\c{RESY}; the
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\i\c{INCBIN} command, the \i\c{EQU} command, and the \i\c{TIMES}
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prefix.
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are \i\c{DB}, \i\c{DW}, \i\c{DD}, \i\c{DQ}, \i\c{DT}, \i\c{DO},
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\i\c{DY} and \i\c\{DZ}; their \i{uninitialized} counterparts
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\i\c{RESB}, \i\c{RESW}, \i\c{RESD}, \i\c{RESQ}, \i\c{REST},
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\i\c{RESO}, \i\c{RESY} and \i\c\{RESZ}; the \i\c{INCBIN} command, the
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\i\c{EQU} command, and the \i\c{TIMES} prefix.
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\S{db} \c{DB} and Friends: Declaring Initialized Data
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\i\c{DB}, \i\c{DW}, \i\c{DD}, \i\c{DQ}, \i\c{DT}, \i\c{DO} and
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\i\c{DY} are used, much as in MASM, to declare initialized data in the
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output file. They can be invoked in a wide range of ways:
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\i\c{DB}, \i\c{DW}, \i\c{DD}, \i\c{DQ}, \i\c{DT}, \i\c{DO}, \i\c{DY}
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and \i\c{DZ} are used, much as in MASM, to declare initialized data in
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the output file. They can be invoked in a wide range of ways:
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\I{floating-point}\I{character constant}\I{string constant}
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\c db 0x55 ; just the byte 0x55
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@ -1292,20 +1292,21 @@ output file. They can be invoked in a wide range of ways:
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\c dq 1.234567e20 ; double-precision float
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\c dt 1.234567e20 ; extended-precision float
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\c{DT}, \c{DO} and \c{DY} do not accept \i{numeric constants} as operands.
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\c{DT}, \c{DO}, \c{DY} and \c{DZ} do not accept \i{numeric constants}
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as operands.
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\S{resb} \c{RESB} and Friends: Declaring \i{Uninitialized} Data
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\i\c{RESB}, \i\c{RESW}, \i\c{RESD}, \i\c{RESQ}, \i\c{REST}, \i\c{RESO}
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and \i\c{RESY} are designed to be used in the BSS section of a module:
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they declare \e{uninitialized} storage space. Each takes a single
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operand, which is the number of bytes, words, doublewords or whatever
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to reserve. As stated in \k{qsother}, NASM does not support the
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MASM/TASM syntax of reserving uninitialized space by writing
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\I\c{?}\c{DW ?} or similar things: this is what it does instead. The
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operand to a \c{RESB}-type pseudo-instruction is a \i\e{critical
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expression}: see \k{crit}.
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\i\c{RESB}, \i\c{RESW}, \i\c{RESD}, \i\c{RESQ}, \i\c{REST},
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\i\c{RESO}, \i\c{RESY} and \i\c\{RESZ} are designed to be used in the
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BSS section of a module: they declare \e{uninitialized} storage
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space. Each takes a single operand, which is the number of bytes,
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words, doublewords or whatever to reserve. As stated in \k{qsother},
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NASM does not support the MASM/TASM syntax of reserving uninitialized
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space by writing \I\c{?}\c{DW ?} or similar things: this is what it
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does instead. The operand to a \c{RESB}-type pseudo-instruction is a
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\i\e{critical expression}: see \k{crit}.
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For example:
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@ -1313,6 +1314,7 @@ For example:
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\c wordvar: resw 1 ; reserve a word
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\c realarray resq 10 ; array of ten reals
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\c ymmval: resy 1 ; one YMM register
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\c zmmvals: resz 32 ; 32 ZMM registers
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\S{incbin} \i\c{INCBIN}: Including External \i{Binary Files}
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@ -1866,11 +1868,11 @@ invent one using the macro processor.
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When assembling with the optimizer set to level 2 or higher (see
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\k{opt-O}), NASM will use size specifiers (\c{BYTE}, \c{WORD},
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\c{DWORD}, \c{QWORD}, \c{TWORD}, \c{OWORD} or \c{YWORD}), but will
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give them the smallest possible size. The keyword \c{STRICT} can be
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used to inhibit optimization and force a particular operand to be
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emitted in the specified size. For example, with the optimizer on, and
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in \c{BITS 16} mode,
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\c{DWORD}, \c{QWORD}, \c{TWORD}, \c{OWORD}, \c{YWORD} or \c{ZWORD}),
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but will give them the smallest possible size. The keyword \c{STRICT}
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can be used to inhibit optimization and force a particular operand to
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be emitted in the specified size. For example, with the optimizer on,
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and in \c{BITS 16} mode,
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\c push dword 33
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@ -55,6 +55,7 @@ DQ ignore ignore ignore
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DT ignore ignore ignore
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DO ignore ignore ignore
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DY ignore ignore ignore
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DZ ignore ignore ignore
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RESB imm [ resb] 8086
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RESW ignore ignore ignore
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RESD ignore ignore ignore
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@ -62,6 +63,7 @@ RESQ ignore ignore ignore
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REST ignore ignore ignore
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RESO ignore ignore ignore
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RESY ignore ignore ignore
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RESZ ignore ignore ignore
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;# Conventional instructions
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AAA void [ 37] 8086,NOLONG
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@ -1,6 +1,6 @@
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/* ----------------------------------------------------------------------- *
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*
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* Copyright 1996-2012 The NASM Authors - All Rights Reserved
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* Copyright 1996-2013 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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@ -790,6 +790,8 @@ int idata_bytes(int opcode)
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return 16;
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case I_DY:
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return 32;
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case I_DZ:
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return 64;
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case I_none:
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return -1;
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default:
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13
parser.c
13
parser.c
@ -406,7 +406,8 @@ restart_parse:
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if (result->opcode == I_DB || result->opcode == I_DW ||
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result->opcode == I_DD || result->opcode == I_DQ ||
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result->opcode == I_DT || result->opcode == I_DO ||
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result->opcode == I_DY || result->opcode == I_INCBIN) {
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result->opcode == I_DY || result->opcode == I_DZ ||
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result->opcode == I_INCBIN) {
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extop *eop, **tail = &result->eops, **fixptr;
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int oper_num = 0;
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int32_t sign;
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@ -414,7 +415,7 @@ restart_parse:
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result->eops_float = false;
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/*
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* Begin to read the DB/DW/DD/DQ/DT/DO/INCBIN operands.
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* Begin to read the DB/DW/DD/DQ/DT/DO/DY/DZ/INCBIN operands.
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*/
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while (1) {
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i = stdscan(NULL, &tokval);
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@ -495,7 +496,7 @@ is_float:
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eop->stringlen = idata_bytes(result->opcode);
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if (eop->stringlen > 16) {
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nasm_error(ERR_NONFATAL, "floating-point constant"
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" encountered in DY instruction");
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" encountered in DY or DZ instruction");
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eop->stringlen = 0;
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} else if (eop->stringlen < 1) {
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nasm_error(ERR_NONFATAL, "floating-point constant"
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@ -1049,7 +1050,7 @@ is_expression:
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result->oprs[operand++].type = 0;
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/*
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* Transform RESW, RESD, RESQ, REST, RESO, RESY into RESB.
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* Transform RESW, RESD, RESQ, REST, RESO, RESY, RESZ into RESB.
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*/
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switch (result->opcode) {
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case I_RESW:
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@ -1076,6 +1077,10 @@ is_expression:
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result->opcode = I_RESB;
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result->oprs[0].offset *= 32;
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break;
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case I_RESZ:
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result->opcode = I_RESB;
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result->oprs[0].offset *= 64;
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break;
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default:
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break;
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}
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