static void setup_frame(int sig, struct target_sigaction *ka, target_sigset_t *set, CPUPPCState *env) { struct target_sigframe *frame; struct target_sigcontext *sc; target_ulong frame_addr, newsp; int err = 0; int signal; frame_addr = get_sigframe(ka, env, sizeof(*frame)); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 1)) goto sigsegv; sc = &frame->sctx; signal = current_exec_domain_sig(sig); __put_user(ka->_sa_handler, &sc->handler); __put_user(set->sig[0], &sc->oldmask); #if defined(TARGET_PPC64) __put_user(set->sig[0] >> 32, &sc->_unused[3]); #else __put_user(set->sig[1], &sc->_unused[3]); #endif __put_user(h2g(&frame->mctx), &sc->regs); __put_user(sig, &sc->signal); /* Save user regs. */ err |= save_user_regs(env, &frame->mctx, TARGET_NR_sigreturn); /* The kernel checks for the presence of a VDSO here. We don't emulate a vdso, so use a sigreturn system call. */ env->lr = (target_ulong) h2g(frame->mctx.tramp); /* Turn off all fp exceptions. */ env->fpscr = 0; /* Create a stack frame for the caller of the handler. */ newsp = frame_addr - SIGNAL_FRAMESIZE; err |= put_user(env->gpr[1], newsp, target_ulong); if (err) goto sigsegv; /* Set up registers for signal handler. */ env->gpr[1] = newsp; env->gpr[3] = signal; env->gpr[4] = frame_addr + offsetof(struct target_sigframe, sctx); env->nip = (target_ulong) ka->_sa_handler; /* Signal handlers are entered in big-endian mode. */ env->msr &= ~MSR_LE; unlock_user_struct(frame, frame_addr, 1); return; sigsegv: unlock_user_struct(frame, frame_addr, 1); qemu_log("segfaulting from setup_frame\n"); force_sig(TARGET_SIGSEGV); }