NAME

as − assembler for PDP-11

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

adb(1), ld(1), nm(1), a.out(5). 
UNIX Assembler Manual by D. M. Ritchie

DIAGNOSTICS

If the name chosen for the output file is of the form *?.[cs], the assembler issues an appropriate complaint and quits.  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

BUGS

Syntax errors can cause incorrect line numbers in subsequent diagnostics. 

May 16, 1980  —  PDP-11 only