Hi!
Working on a Compilers project (http://www.cs.ucsd.edu/~ricko/CSE131B/). We're
compiling Oberon to
Sparc assembly.
I had a bug in my code generator that revealed a crasher in gas.
If you pass three operands to the Sparc floating-point instruction fcmps
(floating-point single-
precision compare), gas segfaults. fcmps is only supposed to take two operands.
This should cause an
illegal operand error, but instead it segfaults. I haven't tested to see if any
other floating-point
instructions are affected.
The server we test our code on is running an older version of gas. Perhaps this
has been fixed. If so,
sorry for bugging you.
gas -v: GNU assembler version 2.14 (sparc-sun-solaris2.8) using BFD version
2.14 20030612
uname -a: SunOS ieng9.ucsd.edu 5.10 Generic_125100-07 sun4u sparc
SUNW,Sun-Fire-880
Testcase:
.section .data
.align 4
zero: .single 0.0
.section .text
.align 4
.global main
main:
save %sp, -96, %sp
! Zero-out the first FP register
set zero, %l0
ld [%l0], %f0
! Compare it to itself
! The third reg (%f0) will cause a segfault in as
! fcmps only takes two regs... this should be illegal operand error
fcmps %f0, %f0, %f0
! Return 0
ret
restore %g0, %g0, %o0
Backtrace (from gdb... WOW we have debugging symbols on???)
(gdb) where
#0 0xff2b0e50 in strlen () from /lib/libc.so.1
#1 0xff316460 in _ndoprnt () from /lib/libc.so.1
#2 0xff318be8 in vsprintf () from /lib/libc.so.1
#3 0x2bfc0 in as_bad (format=0x7fffffff <Address 0x7fffffff out of bounds>)
at /src/gnu/gcc/binutils-2.14/gas/messages.c:340
#4 0x3beb0 in sparc_ip (str=0xfe4dc "fcmps", pinsn=0xffbff89c)
at /src/gnu/gcc/binutils-2.14/gas/config/tc-sparc.c:2670
#5 0x3ba74 in md_assemble (str=0xfe4dc "fcmps")
at /src/gnu/gcc/binutils-2.14/gas/config/tc-sparc.c:1303
Hmm.... it looks like it was trying to print an error message, but failed.
--
Summary: Sparc fcmps instruction - extra operand causes SEGFAULT
Product: binutils
Version: 2.14
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: j dot auricchio at gmail dot com
CC: bug-binutils at gnu dot org
GCC host triplet: sparc-sun-solaris2.8
http://sourceware.org/bugzilla/show_bug.cgi?id=4587
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