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as - assembler
as [ - ] [ -o objfile ] file ...
As assembles the concatenation of the named files. If the optional first argument - is
used, all undefined symbols in the assembly are treated as global.
The output of the assembly is left on the file objfile; if that is omitted, a.out is used.
It is executable if no errors occurred during the assembly, and if there were no unre-
solved external references.
/lib/as2 pass 2 of the assembler
ld(1), nm(1), adb(1), a.out(5)
UNIX Assembler Manual by D. M. Ritchie
When an input file cannot be read, its name followed by a question mark is typed and
assembly ceases. When syntactic or semantic errors occur, a single-character diagnostic
is typed out together with the line number and the file name in which it occurred. Errors
in pass 1 cause cancellation of pass 2. The possible errors are:
) Parentheses error
] Parentheses error
< String not terminated properly
* Indirection used illegally
. Illegal assignment to `.'
a Error in address
b Branch instruction is odd or too remote
e Error in expression
f Error in local (`f' or `b') type symbol
g Garbage (unknown) character
i End of file inside an if
m Multiply defined symbol as label
o Word quantity assembled at odd address
p `.' different in pass 1 and 2
r Relocation error
u Undefined symbol
x Syntax error
Syntax errors can cause incorrect line numbers in following diagnostics.
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