long do_rt_sigreturn(CPUARMState *env) { struct target_rt_sigframe *frame = NULL; abi_ulong frame_addr = env->xregs[31]; trace_user_do_rt_sigreturn(env, frame_addr); if (frame_addr & 15) { goto badframe; } if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { goto badframe; } if (target_restore_sigframe(env, frame)) { goto badframe; } if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) { goto badframe; } unlock_user_struct(frame, frame_addr, 0); return env->xregs[0]; badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); return 0; }