/* $NetBSD: linux_machdep.c,v 1.34 2021/09/07 11:43:04 riastradh Exp $ */ /*- * Copyright (c) 1995, 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Frank van der Linden. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.34 2021/09/07 11:43:04 riastradh Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) { setregs(l, epp, stack); } void linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) { struct lwp * const l = curlwp; struct proc * const p = l->l_proc; struct trapframe * const tf = lwp_trapframe(l); struct linux_sigframe *fp, frame; int onstack, error; const int sig = ksi->ksi_signo; sig_t catcher = SIGACTION(p, sig).sa_handler; /* * The Linux version of this code is in * linux/arch/arm/kernel/signal.c. */ /* Do we need to jump onto the signal stack? */ onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; /* Allocate space for the signal handler context. */ if (onstack) fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); else fp = (struct linux_sigframe *)tf->tf_usr_sp; fp--; /* Build stack frame for signal trampoline. */ memset(&frame, 0, sizeof(frame)); /* Save register context. */ frame.sf_sc.sc_r0 = tf->tf_r0; frame.sf_sc.sc_r1 = tf->tf_r1; frame.sf_sc.sc_r2 = tf->tf_r2; frame.sf_sc.sc_r3 = tf->tf_r3; frame.sf_sc.sc_r4 = tf->tf_r4; frame.sf_sc.sc_r5 = tf->tf_r5; frame.sf_sc.sc_r6 = tf->tf_r6; frame.sf_sc.sc_r7 = tf->tf_r7; frame.sf_sc.sc_r8 = tf->tf_r8; frame.sf_sc.sc_r9 = tf->tf_r9; frame.sf_sc.sc_r10 = tf->tf_r10; frame.sf_sc.sc_r11 = tf->tf_r11; frame.sf_sc.sc_r12 = tf->tf_r12; frame.sf_sc.sc_sp = tf->tf_usr_sp; frame.sf_sc.sc_lr = tf->tf_usr_lr; frame.sf_sc.sc_pc = tf->tf_pc; frame.sf_sc.sc_cpsr = tf->tf_spsr; /* Save signal stack. */ /* Linux doesn't save the onstack flag in sigframe */ /* Save signal mask. */ native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, frame.sf_extramask, mask); /* Other state (mostly faked) */ /* * trapno should indicate the trap that caused the signal: * 6 -> undefined instruction * 11 -> address exception * 14 -> data/prefetch abort */ frame.sf_sc.sc_trapno = 0; frame.sf_sc.sc_error_code = 0; frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr; sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout(&frame, fp, sizeof(frame)); mutex_enter(p->p_lock); if (error != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ sigexit(l, SIGILL); /* NOTREACHED */ } /* * Build context to run handler in. */ tf->tf_r0 = native_to_linux_signo[sig]; tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ tf->tf_r2 = 0; tf->tf_r3 = (register_t)catcher; tf->tf_usr_sp = (register_t)fp; tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; } #if 0 /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * psl to gain improper privileges or to cause * a machine fault. */ int linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval) { /* XXX XAX write me */ return(ENOSYS); } #endif int linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *v, register_t *retval) { struct trapframe * const tf = lwp_trapframe(l); struct proc * const p = l->l_proc; struct linux_sigframe *sfp, frame; sigset_t mask; /* * The trampoline code hands us the context. * It is unsafe to keep track of it ourselves, in the event that a * program jumps out of a signal handler. */ sfp = (struct linux_sigframe *)tf->tf_usr_sp; if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0) return (EFAULT); /* * Make sure the processor mode has not been tampered with and * interrupts have not been disabled. */ if (!VALID_PSR(frame.sf_sc.sc_cpsr)) return EINVAL; /* Restore register context. */ tf->tf_r0 = frame.sf_sc.sc_r0; tf->tf_r1 = frame.sf_sc.sc_r1; tf->tf_r2 = frame.sf_sc.sc_r2; tf->tf_r3 = frame.sf_sc.sc_r3; tf->tf_r4 = frame.sf_sc.sc_r4; tf->tf_r5 = frame.sf_sc.sc_r5; tf->tf_r6 = frame.sf_sc.sc_r6; tf->tf_r7 = frame.sf_sc.sc_r7; tf->tf_r8 = frame.sf_sc.sc_r8; tf->tf_r9 = frame.sf_sc.sc_r9; tf->tf_r10 = frame.sf_sc.sc_r10; tf->tf_r11 = frame.sf_sc.sc_r11; tf->tf_r12 = frame.sf_sc.sc_r12; tf->tf_usr_sp = frame.sf_sc.sc_sp; tf->tf_usr_lr = frame.sf_sc.sc_lr; tf->tf_pc = frame.sf_sc.sc_pc; tf->tf_spsr = frame.sf_sc.sc_cpsr; mutex_enter(p->p_lock); /* Restore signal stack. */ l->l_sigstk.ss_flags &= ~SS_ONSTACK; /* Restore signal mask. */ linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, frame.sf_extramask); (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); mutex_exit(p->p_lock); return (EJUSTRETURN); } /* * major device numbers remapping */ dev_t linux_fakedev(dev_t dev, int raw) { /* XXX write me */ return dev; } /* * We come here in a last attempt to satisfy a Linux ioctl() call */ int linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) { /* { syscallarg(int) fd; syscallarg(u_long) com; syscallarg(void *) data; } */ struct sys_ioctl_args bia; u_long com; SCARG(&bia, fd) = SCARG(uap, fd); SCARG(&bia, data) = SCARG(uap, data); com = SCARG(uap, com); switch (com) { default: printf("linux_machdepioctl: invalid ioctl %08lx\n", com); return EINVAL; } SCARG(&bia, com) = com; return sys_ioctl(l, &bia, retval); } int linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) { return 0; }