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AS(1) GNU Development Tools AS(1)
NAME
AS - the portable GNU assembler.
SYNOPSIS
as [-a[cdhlns][=file]] [--alternate] [-D]
[--defsym sym=val] [-f] [-g] [--gstabs] [--gstabs+]
[--gdwarf-2] [--help] [-I dir] [-J] [-K] [-L]
[--listing-lhs-width=NUM] [--listing-lhs-width2=NUM]
[--listing-rhs-width=NUM] [--listing-cont-lines=NUM]
[--keep-locals] [-o objfile] [-R] [--statistics] [-v]
[-version] [--version] [-W] [--warn] [--fatal-warnings]
[-w] [-x] [-Z] [--target-help] [target-options]
[--βfiles ...]
Target Alpha options:
[-mcpu]
[-mdebug β -no-mdebug]
[-relax] [-g] [-Gsize]
[-F] [-32addr]
Target ARC options:
[-marc[5ββ6ββ7ββ8]]
[-EBβ-EL]
Target ARM options:
[-mcpu=processor[+extension...]]
[-march=architecture[+extension...]]
[-mfpu=floating-point-format]
[-mfloat-abi=abi]
[-meabi=ver]
[-mthumb]
[-EBβ-EL]
[-mapcs-32β-mapcs-26β-mapcs-floatβ
-mapcs-reentrant]
[-mthumb-interwork] [-k]
Target CRIS options:
[--underscore β --no-underscore]
[--pic] [-N]
[--emulation=criself β --emulation=crisaout]
[--march=v0_v10 β --march=v10 β --march=v32 β --march=common_v10_v32]
Target D10V options:
[-O]
Target D30V options:
[-Oβ-nβ-N]
Target i386 options:
[--32β--64] [-n]
Target i960 options:
[-ACAβ-ACA_Aβ-ACBβ-ACCβ-AKAβ-AKBβ
-AKCβ-AMC]
[-b] [-no-relax]
Target IA-64 options:
[-mconstant-gpβ-mauto-pic]
[-milp32β-milp64β-mlp64β-mp64]
[-mleβmbe]
[-mhint.b=okβ-mhint.b=warningβ-mhint.b=error]
[-xβ-xexplicit] [-xauto] [-xdebug]
Target IP2K options:
[-mip2022β-mip2022ext]
Target M32R options:
[--m32rxβ--[no-]warn-explicit-parallel-conflictsβ
--W[n]p]
Target M680X0 options:
[-l] [-m68000β-m68010β-m68020β...]
Target M68HC11 options:
[-m68hc11β-m68hc12β-m68hcs12]
[-mshortβ-mlong]
[-mshort-doubleβ-mlong-double]
[--force-long-branchs] [--short-branchs]
[--strict-direct-mode] [--print-insn-syntax]
[--print-opcodes] [--generate-example]
Target MCORE options:
[-jsri2bsr] [-sifilter] [-relax]
[-mcpu=[210ββ340]]
Target MIPS options:
[-nocpp] [-EL] [-EB] [-O[optimization level]]
[-g[debug level]] [-G num] [-KPIC] [-call_shared]
[-non_shared] [-xgot]
[-mabi=ABI] [-32] [-n32] [-64] [-mfp32] [-mgp32]
[-march=CPU] [-mtune=CPU] [-mips1] [-mips2]
[-mips3] [-mips4] [-mips5] [-mips32] [-mips32r2]
[-mips64] [-mips64r2]
[-construct-floats] [-no-construct-floats]
[-trap] [-no-break] [-break] [-no-trap]
[-mfix7000] [-mno-fix7000]
[-mips16] [-no-mips16]
[-mips3d] [-no-mips3d]
[-mdmx] [-no-mdmx]
[-mdebug] [-no-mdebug]
[-mpdr] [-mno-pdr]
Target MMIX options:
[--fixed-special-register-names] [--globalize-symbols]
[--gnu-syntax] [--relax] [--no-predefined-symbols]
[--no-expand] [--no-merge-gregs] [-x]
[--linker-allocated-gregs]
Target PDP11 options:
[-mpicβ-mno-pic] [-mall] [-mno-extensions]
[-mextensionβ-mno-extension]
[-mcpu] [-mmachine]
Target picoJava options:
[-mbβ-me]
Target PowerPC options:
[-mpwrxβ-mpwr2β-mpwrβ-m601β-mppcβ-mppc32β-m603β-m604β
-m403β-m405β-mppc64β-m620β-mppc64bridgeβ-mbookeβ
-mbooke32β-mbooke64]
[-mcomβ-manyβ-maltivec] [-memb]
[-mregnamesβ-mno-regnames]
[-mrelocatableβ-mrelocatable-lib]
[-mlittleβ-mlittle-endianβ-mbigβ-mbig-endian]
[-msolarisβ-mno-solaris]
Target SPARC options:
[-Av6β-Av7β-Av8β-Asparcletβ-Asparclite
-Av8plusβ-Av8plusaβ-Av9β-Av9a]
[-xarch=v8plusβ-xarch=v8plusa] [-bump]
[-32β-64]
Target TIC54X options:
[-mcpu=54[123589]β-mcpu=54[56]lp] [-mfar-modeβ-mf]
[-merrors-to-file <filename>β-me <filename>]
Target Xtensa options:
[--[no-]text-section-literals] [--[no-]absolute-literals]
[--[no-]target-align] [--[no-]longcalls]
[--[no-]transform]
[--rename-section oldname=newname]
DESCRIPTION
GNU as is really a family of assemblers. If you use (or have used) the GNU assem-
bler on one architecture, you should find a fairly similar environment when you use
it on another architecture. Each version has much in common with the others,
including object file formats, most assembler directives (often called pseudo-ops)
and assembler syntax.
as is primarily intended to assemble the output of the GNU C compiler "gcc" for use
by the linker "ld". Nevertheless, weβve tried to make as assemble correctly every-
thing that other assemblers for the same machine would assemble. Any exceptions
are documented explicitly. This doesnβt mean as always uses the same syntax as
another assembler for the same architecture; for example, we know of several incom-
patible versions of 680x0 assembly language syntax.
Each time you run as it assembles exactly one source program. The source program
is made up of one or more files. (The standard input is also a file.)
You give as a command line that has zero or more input file names. The input files
are read (from left file name to right). A command line argument (in any position)
that has no special meaning is taken to be an input file name.
If you give as no file names it attempts to read one input file from the as stan-
dard input, which is normally your terminal. You may have to type ctl-D to tell as
there is no more program to assemble.
Use -- if you need to explicitly name the standard input file in your command line.
If the source is empty, as produces a small, empty object file.
as may write warnings and error messages to the standard error file (usually your
terminal). This should not happen when a compiler runs as automatically. Warn-
ings report an assumption made so that as could keep assembling a flawed program;
errors report a grave problem that stops the assembly.
If you are invoking as via the GNU C compiler, you can use the -Wa option to pass
arguments through to the assembler. The assembler arguments must be separated from
each other (and the -Wa) by commas. For example:
gcc -c -g -O -Wa,-alh,-L file.c
This passes two options to the assembler: -alh (emit a listing to standard output
with high-level and assembly source) and -L (retain local symbols in the symbol ta-
ble).
Usually you do not need to use this -Wa mechanism, since many compiler command-line
options are automatically passed to the assembler by the compiler. (You can call
the GNU compiler driver with the -v option to see precisely what options it passes
to each compilation pass, including the assembler.)
OPTIONS
-a[cdhlmns]
Turn on listings, in any of a variety of ways:
-ac omit false conditionals
-ad omit debugging directives
-ah include high-level source
-al include assembly
-am include macro expansions
-an omit forms processing
-as include symbols
=file
set the name of the listing file
You may combine these options; for example, use -aln for assembly listing with-
out forms processing. The =file option, if used, must be the last one. By
itself, -a defaults to -ahls.
--alternate
Begin in alternate macro mode, see @ref{Altmacro,,".altmacro"}.
-D Ignored. This option is accepted for script compatibility with calls to other
assemblers.
--defsym sym=value
Define the symbol sym to be value before assembling the input file. value must
be an integer constant. As in C, a leading 0x indicates a hexadecimal value,
and a leading 0 indicates an octal value.
-f ββfastββ---skip whitespace and comment preprocessing (assume source is compiler
output).
-g
--gen-debug
Generate debugging information for each assembler source line using whichever
debug format is preferred by the target. This currently means either STABS,
ECOFF or DWARF2.
--gstabs
Generate stabs debugging information for each assembler line. This may help
debugging assembler code, if the debugger can handle it.
--gstabs+
Generate stabs debugging information for each assembler line, with GNU exten-
sions that probably only gdb can handle, and that could make other debuggers
crash or refuse to read your program. This may help debugging assembler code.
Currently the only GNU extension is the location of the current working direc-
tory at assembling time.
--gdwarf-2
Generate DWARF2 debugging information for each assembler line. This may help
debugging assembler code, if the debugger can handle it. Note---this option is
only supported by some targets, not all of them.
--help
Print a summary of the command line options and exit.
--target-help
Print a summary of all target specific options and exit.
-I dir
Add directory dir to the search list for ".include" directives.
-J Donβt warn about signed overflow.
-K Issue warnings when difference tables altered for long displacements.
-L
--keep-locals
Keep (in the symbol table) local symbols. On traditional a.out systems these
start with L, but different systems have different local label prefixes.
--listing-lhs-width=number
Set the maximum width, in words, of the output data column for an assembler
listing to number.
--listing-lhs-width2=number
Set the maximum width, in words, of the output data column for continuation
lines in an assembler listing to number.
--listing-rhs-width=number
Set the maximum width of an input source line, as displayed in a listing, to
number bytes.
--listing-cont-lines=number
Set the maximum number of lines printed in a listing for a single line of input
to number + 1.
-o objfile
Name the object-file output from as objfile.
-R Fold the data section into the text section.
--statistics
Print the maximum space (in bytes) and total time (in seconds) used by assem-
bly.
--strip-local-absolute
Remove local absolute symbols from the outgoing symbol table.
-v
-version
Print the as version.
--version
Print the as version and exit.
-W
--no-warn
Suppress warning messages.
--fatal-warnings
Treat warnings as errors.
--warn
Donβt suppress warning messages or treat them as errors.
-w Ignored.
-x Ignored.
-Z Generate an object file even after errors.
-- ββ files ...
Standard input, or source files to assemble.
The following options are available when as is configured for an ARC processor.
-marc[5ββ6ββ7ββ8]
This option selects the core processor variant.
-EB ββ -EL
Select either big-endian (-EB) or little-endian (-EL) output.
The following options are available when as is configured for the ARM processor
family.
-mcpu=processor[+extension...]
Specify which ARM processor variant is the target.
-march=architecture[+extension...]
Specify which ARM architecture variant is used by the target.
-mfpu=floating-point-format
Select which Floating Point architecture is the target.
-mfloat-abi=abi
Select which floating point ABI is in use.
-mthumb
Enable Thumb only instruction decoding.
-mapcs-32 ββ -mapcs-26 ββ -mapcs-float ββ -mapcs-reentrant
Select which procedure calling convention is in use.
-EB ββ -EL
Select either big-endian (-EB) or little-endian (-EL) output.
-mthumb-interwork
Specify that the code has been generated with interworking between Thumb and
ARM code in mind.
-k Specify that PIC code has been generated.
See the info pages for documentation of the CRIS-specific options.
The following options are available when as is configured for a D10V processor.
-O Optimize output by parallelizing instructions.
The following options are available when as is configured for a D30V processor.
-O Optimize output by parallelizing instructions.
-n Warn when nops are generated.
-N Warn when a nop after a 32-bit multiply instruction is generated.
The following options are available when as is configured for the Intel 80960 pro-
cessor.
-ACA ββ -ACA_A ββ -ACB ββ -ACC ββ -AKA ββ -AKB ββ -AKC ββ -AMC
Specify which variant of the 960 architecture is the target.
-b Add code to collect statistics about branches taken.
-no-relax
Do not alter compare-and-branch instructions for long displacements; error if
necessary.
The following options are available when as is configured for the Ubicom IP2K
series.
-mip2022ext
Specifies that the extended IP2022 instructions are allowed.
-mip2022
Restores the default behaviour, which restricts the permitted instructions to
just the basic IP2022 ones.
The following options are available when as is configured for the Renesas M32R
(formerly Mitsubishi M32R) series.
--m32rx
Specify which processor in the M32R family is the target. The default is nor-
mally the M32R, but this option changes it to the M32RX.
--warn-explicit-parallel-conflicts or --Wp
Produce warning messages when questionable parallel constructs are encountered.
--no-warn-explicit-parallel-conflicts or --Wnp
Do not produce warning messages when questionable parallel constructs are
encountered.
The following options are available when as is configured for the Motorola 68000
series.
-l Shorten references to undefined symbols, to one word instead of two.
-m68000 ββ -m68008 ββ -m68010 ββ -m68020 ββ -m68030
ββ -m68040 ββ -m68060 ββ -m68302 ββ -m68331 ββ -m68332
ββ -m68333 ββ -m68340 ββ -mcpu32 ββ -m5200
Specify what processor in the 68000 family is the target. The default is nor-
mally the 68020, but this can be changed at configuration time.
-m68881 ββ -m68882 ββ -mno-68881 ββ -mno-68882
The target machine does (or does not) have a floating-point coprocessor. The
default is to assume a coprocessor for 68020, 68030, and cpu32. Although the
basic 68000 is not compatible with the 68881, a combination of the two can be
specified, since itβs possible to do emulation of the coprocessor instructions
with the main processor.
-m68851 ββ -mno-68851
The target machine does (or does not) have a memory-management unit coproces-
sor. The default is to assume an MMU for 68020 and up.
For details about the PDP-11 machine dependent features options, see
@ref{PDP-11-Options}.
-mpic ββ -mno-pic
Generate position-independent (or position-dependent) code. The default is
-mpic.
-mall
-mall-extensions
Enable all instruction set extensions. This is the default.
-mno-extensions
Disable all instruction set extensions.
-mextension ββ -mno-extension
Enable (or disable) a particular instruction set extension.
-mcpu
Enable the instruction set extensions supported by a particular CPU, and dis-
able all other extensions.
-mmachine
Enable the instruction set extensions supported by a particular machine model,
and disable all other extensions.
The following options are available when as is configured for a picoJava processor.
-mb Generate ββbig endianββ format output.
-ml Generate ββlittle endianββ format output.
The following options are available when as is configured for the Motorola 68HC11
or 68HC12 series.
-m68hc11 ββ -m68hc12 ββ -m68hcs12
Specify what processor is the target. The default is defined by the configura-
tion option when building the assembler.
-mshort
Specify to use the 16-bit integer ABI.
-mlong
Specify to use the 32-bit integer ABI.
-mshort-double
Specify to use the 32-bit double ABI.
-mlong-double
Specify to use the 64-bit double ABI.
--force-long-branchs
Relative branches are turned into absolute ones. This concerns conditional
branches, unconditional branches and branches to a sub routine.
-S ββ --short-branchs
Do not turn relative branchs into absolute ones when the offset is out of
range.
--strict-direct-mode
Do not turn the direct addressing mode into extended addressing mode when the
instruction does not support direct addressing mode.
--print-insn-syntax
Print the syntax of instruction in case of error.
--print-opcodes
print the list of instructions with syntax and then exit.
--generate-example
print an example of instruction for each possible instruction and then exit.
This option is only useful for testing as.
The following options are available when as is configured for the SPARC architec-
ture:
-Av6 ββ -Av7 ββ -Av8 ββ -Asparclet ββ -Asparclite
-Av8plus ββ -Av8plusa ββ -Av9 ββ -Av9a
Explicitly select a variant of the SPARC architecture.
-Av8plus and -Av8plusa select a 32 bit environment. -Av9 and -Av9a select a 64
bit environment.
-Av8plusa and -Av9a enable the SPARC V9 instruction set with UltraSPARC exten-
sions.
-xarch=v8plus ββ -xarch=v8plusa
For compatibility with the Solaris v9 assembler. These options are equivalent
to -Av8plus and -Av8plusa, respectively.
-bump
Warn when the assembler switches to another architecture.
The following options are available when as is configured for the βc54x architec-
ture.
-mfar-mode
Enable extended addressing mode. All addresses and relocations will assume
extended addressing (usually 23 bits).
-mcpu=CPU_VERSION
Sets the CPU version being compiled for.
-merrors-to-file FILENAME
Redirect error output to a file, for broken systems which donβt support such
behaviour in the shell.
The following options are available when as is configured for a MIPS processor.
-G num
This option sets the largest size of an object that can be referenced implic-
itly with the "gp" register. It is only accepted for targets that use ECOFF
format, such as a DECstation running Ultrix. The default value is 8.
-EB Generate ββbig endianββ format output.
-EL Generate ββlittle endianββ format output.
-mips1
-mips2
-mips3
-mips4
-mips5
-mips32
-mips32r2
-mips64
-mips64r2
Generate code for a particular MIPS Instruction Set Architecture level. -mips1
is an alias for -march=r3000, -mips2 is an alias for -march=r6000, -mips3 is an
alias for -march=r4000 and -mips4 is an alias for -march=r8000. -mips5,
-mips32, -mips32r2, -mips64, and -mips64r2 correspond to generic MIPS V,
MIPS32, MIPS32 Release 2, MIPS64, and MIPS64 Release 2 ISA processors, respec-
tively.
-march=CPU
Generate code for a particular MIPS cpu.
-mtune=cpu
Schedule and tune for a particular MIPS cpu.
-mfix7000
-mno-fix7000
Cause nops to be inserted if the read of the destination register of an mfhi or
mflo instruction occurs in the following two instructions.
-mdebug
-no-mdebug
Cause stabs-style debugging output to go into an ECOFF-style .mdebug section
instead of the standard ELF .stabs sections.
-mpdr
-mno-pdr
Control generation of ".pdr" sections.
-mgp32
-mfp32
The register sizes are normally inferred from the ISA and ABI, but these flags
force a certain group of registers to be treated as 32 bits wide at all times.
-mgp32 controls the size of general-purpose registers and -mfp32 controls the
size of floating-point registers.
-mips16
-no-mips16
Generate code for the MIPS 16 processor. This is equivalent to putting ".set
mips16" at the start of the assembly file. -no-mips16 turns off this option.
-mips3d
-no-mips3d
Generate code for the MIPS-3D Application Specific Extension. This tells the
assembler to accept MIPS-3D instructions. -no-mips3d turns off this option.
-mdmx
-no-mdmx
Generate code for the MDMX Application Specific Extension. This tells the
assembler to accept MDMX instructions. -no-mdmx turns off this option.
--construct-floats
--no-construct-floats
The --no-construct-floats option disables the construction of double width
floating point constants by loading the two halves of the value into the two
single width floating point registers that make up the double width register.
By default --construct-floats is selected, allowing construction of these
floating point constants.
--emulation=name
This option causes as to emulate as configured for some other target, in all
respects, including output format (choosing between ELF and ECOFF only), han-
dling of pseudo-opcodes which may generate debugging information or store sym-
bol table information, and default endianness. The available configuration
names are: mipsecoff, mipself, mipslecoff, mipsbecoff, mipslelf, mipsbelf. The
first two do not alter the default endianness from that of the primary target
for which the assembler was configured; the others change the default to lit-
tle- or big-endian as indicated by the b or l in the name. Using -EB or -EL
will override the endianness selection in any case.
This option is currently supported only when the primary target as is config-
ured for is a MIPS ELF or ECOFF target. Furthermore, the primary target or
others specified with --enable-targets=... at configuration time must include
support for the other format, if both are to be available. For example, the
Irix 5 configuration includes support for both.
Eventually, this option will support more configurations, with more fine-
grained control over the assemblerβs behavior, and will be supported for more
processors.
-nocpp
as ignores this option. It is accepted for compatibility with the native
tools.
--trap
--no-trap
--break
--no-break
Control how to deal with multiplication overflow and division by zero. --trap
or --no-break (which are synonyms) take a trap exception (and only work for
Instruction Set Architecture level 2 and higher); --break or --no-trap (also
synonyms, and the default) take a break exception.
-n When this option is used, as will issue a warning every time it generates a nop
instruction from a macro.
The following options are available when as is configured for an MCore processor.
-jsri2bsr
-nojsri2bsr
Enable or disable the JSRI to BSR transformation. By default this is enabled.
The command line option -nojsri2bsr can be used to disable it.
-sifilter
-nosifilter
Enable or disable the silicon filter behaviour. By default this is disabled.
The default can be overridden by the -sifilter command line option.
-relax
Alter jump instructions for long displacements.
-mcpu=[210ββ340]
Select the cpu type on the target hardware. This controls which instructions
can be assembled.
-EB Assemble for a big endian target.
-EL Assemble for a little endian target.
See the info pages for documentation of the MMIX-specific options.
The following options are available when as is configured for an Xtensa processor.
--text-section-literals ββ --no-text-section-literals
With --text-section-literals, literal pools are interspersed in the text sec-
tion. The default is --no-text-section-literals, which places literals in a
separate section in the output file. These options only affect literals
referenced via PC-relative "L32R" instructions; literals for absolute mode
"L32R" instructions are handled separately.
--absolute-literals ββ --no-absolute-literals
Indicate to the assembler whether "L32R" instructions use absolute or PC-rela-
tive addressing. The default is to assume absolute addressing if the Xtensa
processor includes the absolute "L32R" addressing option. Otherwise, only the
PC-relative "L32R" mode can be used.
--target-align ββ --no-target-align
Enable or disable automatic alignment to reduce branch penalties at the expense
of some code density. The default is --target-align.
--longcalls ββ --no-longcalls
Enable or disable transformation of call instructions to allow calls across a
greater range of addresses. The default is --no-longcalls.
--transform ββ --no-transform
Enable or disable all assembler transformations of Xtensa instructions. The
default is --transform; --no-transform should be used only in the rare cases
when the instructions must be exactly as specified in the assembly source.
SEE ALSO
gcc(1), ld(1), and the Info entries for binutils and ld.
COPYRIGHT
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002 Free Software
Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document under the
terms of the GNU Free Documentation License, Version 1.1 or any later version pub-
lished by the Free Software Foundation; with no Invariant Sections, with no Front-
Cover Texts, and with no Back-Cover Texts. A copy of the license is included in
the section entitled ββGNU Free Documentation Licenseββ.
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