This still reproduces on git master: (sid-sh4-sbuild)root@nofan:/# gcc setcontext.c -o setcontext -lpthread (sid-sh4-sbuild)root@nofan:/# ./setcontext Unhandled trap: 0x180 pc=0x7f68e99e sr=0x00000000 pr=0x00400750 fpscr=0x00080000 spc=0x00000000 ssr=0x00000000 gbr=0x7f7a2de8 vbr=0x00000000 sgr=0x00000000 dbr=0x00000000 delayed_pc=0x7f68e960 fpul=0x00000000 r0=0x00e11158 r1=0x00000000 r2=0x00000001 r3=0x7ffff590 r4=0x00e11068 r5=0x7ffff5c4 r6=0x7ffff5cc r7=0x00000000 r8=0x004007f0 r9=0x00000000 r10=0x00000000 r11=0x00000000 r12=0x7f79ec64 r13=0x00000000 r14=0x7ffff538 r15=0x7ffff538 r16=0x00000000 r17=0x00000000 r18=0x00000000 r19=0x00000000 r20=0x00000000 r21=0x00000000 r22=0x00000000 r23=0x00000000 (sid-sh4-sbuild)root@nofan:/#
And it is fixed by reverting 61dedf2af7 (sid-sh4-sbuild)root@nofan:/# ./setcontext (sid-sh4-sbuild)root@nofan:/# echo $? 0 (sid-sh4-sbuild)root@nofan:/# So it's presumably the same bug as https://bugs.launchpad.net/qemu/+bug/1796520 -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1737444 Title: gccgo setcontext conftest crashes qemu-sh4 Status in QEMU: New Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1737444/+subscriptions
