setjmp and longjmp missing

[ramsdell]

I once was able to run Lua within an enclave. When I try to compile the code now, I get a linkage error saying setjmp and longjmp is undefined. Here is a small program that demonstrates the problem.

$ cat user/demo/sj.c

include <setjmp.h>

if defined NOSGX

int main()
{
jmp_buf env;
if (setjmp(env)) {
return 0;
}
else {
longjmp(env, 1);
}
}

else

include <sgx-lib.h>

void enclave_main()
{
jmp_buf env;
if (setjmp(env)) {
sgx_exit(NULL);
}
else {
longjmp(env, 1);
}
}

endif

$ ./opensgx -c user/demo/sj.c
cc -c -g -Iinclude -Ishare/include -Wall -pedantic -Wno-unused-function -std=gnu11 -I../libsgx/include -I../libsgx/musl-libc/include -fno-stack-protector -static -fvisibility=hidden -o demo/sj.o demo/sj.c
cc -static -nostdlib -nostartfiles -Wl,-T,sgx.lds demo/sj.o -o demo/sj.sgx ../libsgx/sgx-entry.o ../libsgx/libsgx.a ../libsgx/libpolarssl-sgx.a ../libsgx/libc-sgx.a
demo/sj.o: In function enclave_main': /home/ramsdell/rep/opensgx/user/demo/sj.c:22: undefined reference tosetjmp'
/home/ramsdell/rep/opensgx/user/demo/sj.c:26: undefined reference to `longjmp'
collect2: error: ld returned 1 exit status
make: *** [demo/sj.sgx] Error 1
rm demo/sj.o
$

[ramsdell]

Big discovery here. I just checked out commit 6cc1fe6. With this commit, my problems disappear and I can run the program I wrote that includes a Lua interpreter running within an enclave.

It appears that commit 6c46fa6 is the one that is causing my problems, although I do not know why at this time. The commit message is "System call supports in the enclave". I will try continue to try to identify the problem.

[ramsdell]

The bad commit appears to change the following files:

libsgx/musl-libc/Makefile
libsgx/musl-libc/arch/x86_64/syscall_arch.h
libsgx/musl-libc/src/thread/cancel_dummy.c
qemu/target-i386/seg_helper.c
user/sgx-trampoline.c

The change in the Makefile causes the definition of setjmp to be omitted, so that problem and its solution in pretty obvious: revert to the previous version of the Makefile. It is not clear how the other changes cause OpenSGX to become non-operational, but please either fix it or revert to the working version. Please test using the dlsrv example I sent as it exercises much of the embedded C library.

[johnmwshih]

hmm.. I'm not sure about what happen in that commit. I'll just revert instead.