term% cat index.txt AS(1) General Commands Manual AS(1)
NAME
as - assembler
SYNOPSIS
as [ - ] [ -o objfile ] file ...
DESCRIPTION
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 unresolved external references.
FILES
/lib/as2 pass 2 of the assembler
/tmp/atm[1-3]? temporary
a.out object
SEE ALSO
ld(1), nm(1), adb(1), a.out(5)
UNIX Assembler Manual by D. M. Ritchie
DIAGNOSTICS
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 num‐
ber 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
BUGS
Syntax errors can cause incorrect line numbers in following diagnos‐
tics.
PDP11 AS(1)