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[Jikesrvm-researchers] jikesrvm is not building its shared libraries with position independent code
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From: Brian D. C. <bd...@ca...> - 2005-01-21 03:16:45
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[ reposting lost message from Sat Jan 15 17:38:01 -0800 2005 ]
I found that jikesrvm is not compiling its shared libraries libjpnexec
and libsyswrap with the compiler options for position independent
code. Apparently this is not always fatal but was fatal in my
simulation environment.
I am running jikesrvm from CVS at label JIKESRVM-2r3r3 on PowerPC with
Yellow Dog Linux. I also use Mac OS X and linux/x86 but this problem
was discovered on linux/ppc. I confirmed the problem still exists at
CVS head on linux/x86.
rvm runs fine out of the box on my YDL box. However, I usually run
jikesrvm in out "less" PowerPC simulator. After recent simulator
changes, I got a SIGSEGV when starting up JikesRVM. I used strace and
gdb to investigate. The strace output is below but I'll highlight the
main lines here.
You can see that reading the RVM.image causes a 16k chunk to mmap for the FILE* buffer. the address is 0x310b4000
open("/Network/Servers/tcc.Stanford.EDU/Users/bdc/linux/rvmRoot/jikesrvm/build/RVM.image", O_RDONLY) = 10
fstat64(10, {st_mode=S_IFREG|0644, st_size=14567712, ...}) = 0
mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x310b4000
then JikesRVM maps space for the image at 0x31000000, which overlaps with the 16k chunk mapped at 0x310b4000
mmap(0x31000000, 14569472, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x31000000
when the file is closed the FILE* buffer is unmapepd
munmap(0x310b4000, 16384) = 0
then in sys.C we get a SEGV when this loop hits 0x310b4000
/* update storage */
/* Note: if one knew the cache line size, one could write a better loop */
for (addr=start; addr < end; ++addr)
asm("dcbst 0,%0" : : "r" (addr) );
no problem right? I just bump the BOOTIMAGE_LOAD_ADDRESS from 0x31000000 to 0x31000000 in my config:
export BOOTIMAGE_LOAD_ADDRESS=0x32000000
"rvm" still runs fine outside without the simulator.
However, now when I run in the simulator I get:
JikesRVM: error loading library /Network/Servers/tcc.Stanford.EDU/Users/bdc/linux/rvmRoot/jikesrvm/build/libjpnexec.so: /Network/Servers/tcc.Stanford.EDU/Users/bdc/linux/rvmRoot/jikesrvm/build/libjpnexec.so: R_PPC_REL24 relocation at 0x0f87930c for symbol _assert_fail' out of range
Well, thanks to google, I found that the ELF PPC relocation type
R_PPC_REL24 really shouldn't be found in shared libraries. I checked
with "objdump -R $RVM_BUILD/*.so" and all the classpath shared
libraries are fine but not the ones built by jikesrvm.
Fortunately simply adding -fPIC to my config fixes this problem. I
checked at CVS head and the problem seems to exist on linux/x86 as
well with "objdump -R" showing relocation records with types R_386_32
and R_386_PC32 that aren't present in the classpath files.
I've attached a patch to CVS head for this issue for linux/x86,
linux/ppc, and macosx. On Mac OS X I could not use "objdump -R" to
test since it doesn't work well Mach-O files, but I added -fno-common
matching what classpath does. The patch also includes a one line
linux/x86 compilation fix that was necessary on my box (glibc-2.3.3
kernel 2.6.9)
-bri
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open("/Network/Servers/tcc.Stanford.EDU/Users/bdc/linux/rvmRoot/jikesrvm/build/RVM.image", O_RDONLY) = 10
fstat64(10, {st_mode=S_IFREG|0644, st_size=14567712, ...}) = 0
mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x310b4000
fstat64(10, {st_mode=S_IFREG|0644, st_size=14567712, ...}) = 0
_llseek(10, 14565376, [14565376], SEEK_SET) = 0
read(10, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2336) = 2336
_llseek(10, 0, [0], SEEK_SET) = 0
mmap(0x31000000, 14569472, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x31000000
read(10, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 14565376) = 14565376
read(10, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 16384) = 2336
close(10) = 0
munmap(0x310b4000, 16384) = 0
sigaltstack({ss_sp=0x168de478, ss_flags=0, ss_size=16384}, NULL) = 0
rt_sigaction(SIGSEGV, {0x1000620c, ~[CONT RTMIN], SA_STACK|SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
rt_sigaction(SIGTRAP, {0x1000620c, ~[CONT RTMIN], SA_STACK|SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
rt_sigaction(SIGILL, {0x1000620c, ~[CONT RTMIN], SA_STACK|SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
rt_sigaction(SIGALRM, {0x10006a8c, ~[CONT RTMIN], SA_STACK|SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
rt_sigaction(SIGHUP, {0x10006a8c, ~[CONT RTMIN], SA_STACK|SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
rt_sigaction(SIGQUIT, {0x10006a8c, ~[CONT RTMIN], SA_STACK|SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
rt_sigaction(SIGTERM, {0x10006a8c, ~[CONT RTMIN], SA_STACK|SA_RESTART|SA_SIGINFO}, NULL, 8) = 0
rt_sigaction(SIGPIPE, {SIG_IGN}, NULL, 8) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
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zot:~/rvmRoot/jikesrvm $ cvs diff -c
Index: rvm/config/i686-pc-linux-gnu
===================================================================
RCS file: /usr/cvs/jikesrvm/rvm/config/i686-pc-linux-gnu,v
retrieving revision 1.50
diff -c -r1.50 i686-pc-linux-gnu
*** rvm/config/i686-pc-linux-gnu 19 Dec 2004 22:48:49 -0000 1.50
--- rvm/config/i686-pc-linux-gnu 16 Jan 2005 01:26:03 -0000
***************
*** 163,173 ****
## preprocessor macros.
# export CC="/usr/bin/gcc -pipe -ggdb3 -O -W -Wall -Wbad-function-cast -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -fkeep-static-consts -fkeep-inline-functions -Wwrite-strings -Wno-aggregate-return -Wmissing-noreturn -Wnested-externs -Wtrigraphs -Wconversion -Wsign-compare -Wno-float-equal -Wmissing-format-attribute -Wno-unreachable-code -Wdisabled-optimization"
! export CC="gcc -w -pipe -ggdb3 -O"
## What C++ compiler should be used?
# export CPLUS='/usr/bin/g++ -pipe -ggdb3 -W -Wall -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -fkeep-static-consts -fkeep-inline-functions -Wwrite-strings -Wno-aggregate-return -Wmissing-noreturn -Wtrigraphs -Wconversion -Wsign-compare -Wno-float-equal -Wmissing-format-attribute -Wno-unreachable-code -Wdisabled-optimization -fcheck-new -fpermissive -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Woverloaded-virtual -Wsign-promo -O'
! export CPLUS="g++ -w -pipe -ggdb3 -O"
# how to link a shared C++ library (possibly also recompile one
--- 163,173 ----
## preprocessor macros.
# export CC="/usr/bin/gcc -pipe -ggdb3 -O -W -Wall -Wbad-function-cast -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -fkeep-static-consts -fkeep-inline-functions -Wwrite-strings -Wno-aggregate-return -Wmissing-noreturn -Wnested-externs -Wtrigraphs -Wconversion -Wsign-compare -Wno-float-equal -Wmissing-format-attribute -Wno-unreachable-code -Wdisabled-optimization"
! export CC="gcc -w -pipe -ggdb3 -O -fPIC"
## What C++ compiler should be used?
# export CPLUS='/usr/bin/g++ -pipe -ggdb3 -W -Wall -Wcast-align -Wpointer-arith -Wcast-qual -Wshadow -Wstrict-prototypes -Wmissing-prototypes -fkeep-static-consts -fkeep-inline-functions -Wwrite-strings -Wno-aggregate-return -Wmissing-noreturn -Wtrigraphs -Wconversion -Wsign-compare -Wno-float-equal -Wmissing-format-attribute -Wno-unreachable-code -Wdisabled-optimization -fcheck-new -fpermissive -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Woverloaded-virtual -Wsign-promo -O'
! export CPLUS="g++ -w -pipe -ggdb3 -O -fPIC"
# how to link a shared C++ library (possibly also recompile one
Index: rvm/config/powerpc-unknown-linux-gnu
===================================================================
RCS file: /usr/cvs/jikesrvm/rvm/config/powerpc-unknown-linux-gnu,v
retrieving revision 1.27
diff -c -r1.27 powerpc-unknown-linux-gnu
*** rvm/config/powerpc-unknown-linux-gnu 8 Jul 2004 11:09:30 -0000 1.27
--- rvm/config/powerpc-unknown-linux-gnu 16 Jan 2005 01:26:03 -0000
***************
*** 64,73 ****
export JIKES=/usr/bin/jikes
# what C compilers should be used?
! export CC="/usr/bin/gcc -w -g -O -Wa,-mppc"
# what C++ compilers should be used?
! export CPLUS='/usr/bin/g++ -w -g -O'
# how to link a shared C++ library
export LDSHARED="${CPLUS} -shared"
--- 64,73 ----
export JIKES=/usr/bin/jikes
# what C compilers should be used?
! export CC="/usr/bin/gcc -w -g -O -Wa,-mppc -fPIC"
# what C++ compilers should be used?
! export CPLUS='/usr/bin/g++ -w -g -O -fPIC'
# how to link a shared C++ library
export LDSHARED="${CPLUS} -shared"
Index: rvm/config/powerpc-unknown-osx-gnu
===================================================================
RCS file: /usr/cvs/jikesrvm/rvm/config/powerpc-unknown-osx-gnu,v
retrieving revision 1.4
diff -c -r1.4 powerpc-unknown-osx-gnu
*** rvm/config/powerpc-unknown-osx-gnu 17 Dec 2004 18:34:53 -0000 1.4
--- rvm/config/powerpc-unknown-osx-gnu 16 Jan 2005 01:26:03 -0000
***************
*** 60,72 ****
export JIKES=/usr/local/bin/jikes # v 1.18
# what C compilers should be used?
! export CC="/usr/bin/gcc -w -O"
# what C++ compilers should be used?
! export CPLUS="/usr/bin/g++"
# how to link a shared C++ library
! export LDSHARED="/usr/bin/g++ -dynamiclib"
# used by the jbuild.linkBooter
export CPP=/usr/bin/cpp
--- 60,72 ----
export JIKES=/usr/local/bin/jikes # v 1.18
# what C compilers should be used?
! export CC="/usr/bin/gcc -w -O -fno-common"
# what C++ compilers should be used?
! export CPLUS="/usr/bin/g++ -fno-common"
# how to link a shared C++ library
! export LDSHARED="${CPLUS} -dynamiclib"
# used by the jbuild.linkBooter
export CPP=/usr/bin/cpp
Index: rvm/src/tools/bootImageRunner/sys.C
===================================================================
RCS file: /usr/cvs/jikesrvm/rvm/src/tools/bootImageRunner/sys.C,v
retrieving revision 1.103
diff -c -r1.103 sys.C
*** rvm/src/tools/bootImageRunner/sys.C 18 Dec 2004 00:54:13 -0000 1.103
--- rvm/src/tools/bootImageRunner/sys.C 16 Jan 2005 01:26:04 -0000
***************
*** 44,50 ****
#include <sys/stat.h>
#include <sys/sysinfo.h>
#include <netinet/in.h>
- #include <linux/net.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <asm/ioctls.h>
--- 44,49 ----
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