Use GNU syntax for newly created assembly files. Use the armclang integrated assembler to assemble GNU assembly language source code. Typically, you invoke the armclang assembler as follows:. All rights reserved. This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. This inconsistency is due to the different behaviors of the various native assemblers for these systems which GAS must emulate.
GAS also provides. This statement may go away in future: it is only recognized to be compatible with old as programs. It assembles each string with no automatic trailing zero byte into consecutive addresses. The first expression which must be absolute is the alignment request in bytes. For example,. If it skips two bytes, they will be filled in with the value 0xd the exact placement of the bytes depends upon the endianness of the processor.
If it skips 1 or 3 bytes, the fill value is undefined. Each expression is assembled into the next byte. When linking, a common symbol in one object file may be merged with a defined or common symbol of the same name in another object file. If ld does not see a definition for the symbol--just one or more common symbols--then it will allocate length bytes of uninitialized memory.
If ld sees multiple common symbols with the same name, and they do not all have the same size, it will allocate space using the largest size. When using ELF, the. This is the desired alignment of the symbol, specified as a byte boundary for example, an alignment of 16 means that the least significant 4 bits of the address should be zero. The alignment must be an absolute expression, and it must be a power of two. If ld allocates uninitialized memory for the common symbol, it will use the alignment when placing the symbol.
If no alignment is specified, as will set the alignment to the largest power of two less than or equal to the size of the symbol, up to a maximum of The syntax for.
If subsection is omitted, it defaults to zero. Begin defining debugging information for a symbol name ; the definition extends until the. This directive is only observed when as is configured for COFF format output; when producing b. This directive sets the descriptor of the symbol see section Symbol Attributes to the low 16 bits of an absolute expression.
For the sake of compatibility, as accepts it, but produces no output, when configured for COFF. This directive is generated by compilers to include auxiliary debugging information in the symbol table.
It is only permitted inside. It assembles floating point numbers. The exact kind of floating point numbers emitted depends on how as is configured. Force a page break at this point, when generating assembly listings. It marks the beginning of a section of code to be assembled if the condition for the preceding. This directive flags the end of a symbol definition begun with.
See section. This directive sets the value of symbol to expression. Except for the contents of the error message, this is roughly equivalent to. This can be used to signal error an conditionally compiled code.
In some configurations of as ,. This emits repeat copies of size bytes. Repeat may be zero or more. Size may be zero or more, but if it is more than 8, then it is deemed to have the value 8, compatible with other people's assemblers. The contents of each repeat bytes is taken from an 8-byte number.
The highest order 4 bytes are zero. The lowest order 4 bytes are value rendered in the byte-order of an integer on the computer as is assembling for.
Each size bytes in a repetition is taken from the lowest order size bytes of this number. Again, this bizarre behavior is compatible with other people's assemblers. If the second comma and value are absent, value is assumed zero. If the first comma and following tokens are absent, size is assumed to be 1. This directive assembles zero or more flonums, separated by commas.
It has the same effect as. If you define symbol in your partial program, its value is made available to other partial programs that are linked with it.
Otherwise, symbol takes its attributes from a symbol of the same name from another file linked into the same program. On the HPPA,. You may need the HPPA-only. This expects zero or more expressions , and emits a 16 bit number for each. This directive is used by some assemblers to place tags in object files. The end of the conditional section of code must be marked by.
The following variants of. Both spelling variants are equivalent. The code from file is assembled as if it followed the point of the. Quotation marks are required around file. Expect zero or more expressions , of any section, separated by commas. For each expression, emit a number that, at run time, is the value of that expression.
The byte order and bit size of the number depends on what kind of target the assembly is for. Evaluate a sequence of statements assigning different values to symbol.
The sequence of statements starts at the. To subscribe to the bug-binutils gnu. You may wish to browse the old mail archives of the gas2 and bfd mailing lists. These were the discussion lists for binutils until May Please do not send mail to them any longer. The documentation for binutils 2. A guide to porting the binutils to a new target has been contributed.
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