The gas manual says "The same escapes apply to characters as to strings"
(http://sourceware.org/binutils/docs-2.20/as/Chars.html#Chars), and one of the
string escapes is "\ digit digit digit", "An octal character code."
(http://sourceware.org/binutils/docs-2.20/as/Strings.html#Strings). Also, "Any
other character when escaped by \ gives a warning, but assembles as if the `\'
was not present"
Gas appears to directly replace a character constant with the number, instead of
replacing the whole field, so things like 'A0 are legal ('A becomes 65, and it's
like you typed 650). I assume this is intended behavior and not a bug, although
I can't find it documented anywhere.
However, constants like '\000 appear to be handled incorrectly. \0 isn't a valid
escape, so it's just handled as a normal 0. '0 becomes 48 (the code for 0), and
the other 0s are suffixed as above, so '\000 = '000 = 4800
--
Summary: Odd behavior of character escapes
Product: binutils
Version: 2.19
Status: NEW
Severity: normal
Priority: P3
Component: gas
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: mmrozek at arxandefense dot com
CC: bug-binutils at gnu dot org
GCC host triplet: ppc-unknown-linux-gnu
GCC target triplet: ppc-unknown-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=10946
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