static long do_sigreturn_v2(CPUARMState *env) { abi_ulong frame_addr; struct sigframe_v2 *frame = NULL; /* * Since we stacked the signal on a 64-bit boundary, * then 'sp' should be word aligned here. If it's * not, then the user is trying to mess with us. */ frame_addr = env->regs[13]; trace_user_do_sigreturn(env, frame_addr); if (frame_addr & 7) { goto badframe; } if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { goto badframe; } if (do_sigframe_return_v2(env, frame_addr, &frame->uc)) { goto badframe; } unlock_user_struct(frame, frame_addr, 0); return env->regs[0]; badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV /* , current */); return 0; }