long do_rt_sigreturn(CPUX86State *env) { abi_ulong frame_addr; struct rt_sigframe *frame; sigset_t set; int eax; frame_addr = env->regs[R_ESP] - 4; if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) goto badframe; target_to_host_sigset(&set, &frame->uc.tuc_sigmask); sigprocmask(SIG_SETMASK, &set, NULL); if (restore_sigcontext(env, &frame->uc.tuc_mcontext, &eax)) goto badframe; if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) goto badframe; unlock_user_struct(frame, frame_addr, 0); return eax; badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); return 0; }