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gccgo setcontext conftest crashes qemu-sh4
While testing gccgo on sh4 to add SH platform definitions to libgo, I discovered that the following conftest program which is part of the libgo configure script crashes on qemu-sh4:
(sid-sh4-sbuild)root@z6:/# cat setcontext.c
#include <pthread.h>
#include <stdlib.h>
#include <ucontext.h>
#include <unistd.h>
__thread int tls;
static char stack[10 * 1024 * 1024];
static ucontext_t c;
/* Called via makecontext/setcontext. */
static void
cfn (void)
{
exit (tls);
}
/* Called via pthread_create. */
static void *
tfn (void *dummy)
{
/* The thread should still see this value after calling
setcontext. */
tls = 0;
setcontext (&c);
/* The call to setcontext should not return. */
abort ();
}
int
main ()
{
pthread_t tid;
/* The thread should not see this value. */
tls = 1;
if (getcontext (&c) < 0)
abort ();
c.uc_stack.ss_sp = stack;
#ifdef MAKECONTEXT_STACK_TOP
c.uc_stack.ss_sp += sizeof stack;
#endif
c.uc_stack.ss_flags = 0;
c.uc_stack.ss_size = sizeof stack;
c.uc_link = NULL;
makecontext (&c, cfn, 0);
if (pthread_create (&tid, NULL, tfn, NULL) != 0)
abort ();
if (pthread_join (tid, NULL) != 0)
abort ();
/* The thread should have called exit. */
abort ();
}
(sid-sh4-sbuild)root@z6:/# gcc -o setcontext -lpthread setcontext.c
(sid-sh4-sbuild)root@z6:/# ./setcontext
Unhandled trap: 0x180
pc=0x7f69235e sr=0x00000000 pr=0x00400710 fpscr=0x00080000
spc=0x00000000 ssr=0x00000000 gbr=0x7f658478 vbr=0x00000000
sgr=0x00000000 dbr=0x00000000 delayed_pc=0x7f692320 fpul=0x00000000
r0=0x00e11158 r1=0x00000000 r2=0x00000001 r3=0x7ffff2e0
r4=0x00e11068 r5=0x7ffff314 r6=0x7ffff31c r7=0x00000000
r8=0x004007b0 r9=0x00000000 r10=0x00000000 r11=0x00000000
r12=0x7f79ac54 r13=0x00000000 r14=0x7ffff288 r15=0x7ffff288
r16=0x00000000 r17=0x00000000 r18=0x00000000 r19=0x00000000
r20=0x00000000 r21=0x00000000 r22=0x00000000 r23=0x00000000
(sid-sh4-sbuild)root@z6:/#
The same code works fine on my Renesas SH7785LCR evaluation board:
root@tirpitz:~> uname -a
Linux tirpitz 3.16.7-ckt7 #8 PREEMPT Fri Oct 21 18:47:41 CEST 2016 sh4a GNU/Linux
root@tirpitz:~> gcc -o setcontext setcontext.c -lpthread
root@tirpitz:~> ./setcontext
root@tirpitz:~> echo $?
0
root@tirpitz:~>
Due to this bug, it is not possible to compile gcc-7 with the Go frontend enabled on qemu-sh4.
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