/* $NetBSD: linux_machdep.c,v 1.52 2021/09/07 11:43:03 riastradh Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Eric Haszlakiewicz. * * 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. * * Based on sys/arch/i386/i386/linux_machdep.c: * linux_machdep.c,v 1.42 1998/09/11 12:50:06 mycroft Exp * written by Frank van der Linden * */ #include __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.52 2021/09/07 11:43:03 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 #include #include #if defined(_KERNEL_OPT) #include "wsdisplay.h" #endif #if (NWSDISPLAY >0) #include #endif #ifdef DEBUG #include #endif /* * Deal with some alpha-specific things in the Linux emulation code. */ void linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) { #ifdef DEBUG struct trapframe *tfp = l->l_md.md_tf; #endif setregs(l, epp, stack); #ifdef DEBUG /* * Linux has registers set to zero on entry; for DEBUG kernels * the alpha setregs() fills registers with 0xbabefacedeadbeef. */ memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); #endif } void setup_linux_rt_sigframe(struct trapframe *tf, const ksiginfo_t *ksi, const sigset_t *mask) { struct lwp *l = curlwp; struct proc *p = l->l_proc; struct linux_rt_sigframe *sfp, sigframe; int onstack, error; int fsize, rndfsize; int sig = ksi->ksi_signo; extern char linux_rt_sigcode[], linux_rt_esigcode[]; /* 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. */ fsize = sizeof(struct linux_rt_sigframe); rndfsize = ((fsize + 15) / 16) * 16; if (onstack) sfp = (struct linux_rt_sigframe *) ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); else sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); sfp = (struct linux_rt_sigframe *)((char *)sfp - rndfsize); #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, sig, &onstack, sfp); #endif /* DEBUG */ memset(&sigframe, 0, sizeof(sigframe)); /* * Build the signal context to be used by sigreturn. */ memset(&sigframe.uc, 0, sizeof(struct linux_ucontext)); sigframe.uc.uc_mcontext.sc_onstack = onstack; /* Setup potentially partial signal mask in sc_mask. */ /* But get all of it in uc_sigmask */ native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask); native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); fpu_load(); alpha_pal_wrfen(1); sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); alpha_pal_wrfen(0); sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; native_to_linux_siginfo(&sigframe.info, &ksi->ksi_info); sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout((void *)&sigframe, (void *)sfp, fsize); mutex_enter(p->p_lock); if (error != 0) { #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("sendsig(%d): copyout failed on sig %d\n", p->p_pid, sig); #endif /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ sigexit(l, SIGILL); /* NOTREACHED */ } /* Pass pointers to siginfo and ucontext in the regs */ tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; /* Address of trampoline code. End up at this PC after mi_switch */ tf->tf_regs[FRAME_PC] = (u_int64_t)(p->p_psstrp - (linux_rt_esigcode - linux_rt_sigcode)); /* Adjust the stack */ alpha_pal_wrusp((unsigned long)sfp); /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; } void setup_linux_sigframe(struct trapframe *tf, const ksiginfo_t *ksi, const sigset_t *mask) { struct lwp *l = curlwp; struct proc *p = l->l_proc; struct linux_sigframe *sfp, sigframe; int onstack, error; int fsize, rndfsize; int sig = ksi->ksi_signo; extern char linux_sigcode[], linux_esigcode[]; /* 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. */ fsize = sizeof(struct linux_sigframe); rndfsize = ((fsize + 15) / 16) * 16; if (onstack) sfp = (struct linux_sigframe *) ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); else sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); sfp = (struct linux_sigframe *)((char *)sfp - rndfsize); #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, sig, &onstack, sfp); #endif /* DEBUG */ memset(&sigframe, 0, sizeof(sigframe)); /* * Build the signal context to be used by sigreturn. */ memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext)); sigframe.sf_sc.sc_onstack = onstack; native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); if (fpu_valid_p(l)) { struct pcb *pcb = lwp_getpcb(l); fpu_save(l); sigframe.sf_sc.sc_fpcr = pcb->pcb_fp.fpr_cr; } /* XXX ownedfp ? etc...? */ sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout((void *)&sigframe, (void *)sfp, fsize); mutex_enter(p->p_lock); if (error != 0) { #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("sendsig(%d): copyout failed on sig %d\n", p->p_pid, sig); #endif /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ sigexit(l, SIGILL); /* NOTREACHED */ } /* Pass pointers to sigcontext in the regs */ tf->tf_regs[FRAME_A1] = 0; tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; /* Address of trampoline code. End up at this PC after mi_switch */ tf->tf_regs[FRAME_PC] = (u_int64_t)(p->p_psstrp - (linux_esigcode - linux_sigcode)); /* Adjust the stack */ alpha_pal_wrusp((unsigned long)sfp); /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; } /* * Send an interrupt to process. * * Stack is set up to allow sigcode stored * in u. to call routine, followed by kcall * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user * specified pc, psl. */ void linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) { struct lwp *l = curlwp; struct proc *p = l->l_proc; struct trapframe *tf = l->l_md.md_tf; const int sig = ksi->ksi_signo; sig_t catcher = SIGACTION(p, sig).sa_handler; #ifdef notyet struct linux_emuldata *edp; /* Setup the signal frame (and part of the trapframe) */ /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ /* XXX XAX this is broken now. need someplace to store what XXX XAX kind of signal handler a signal has.*/ #if 0 edp = (struct linux_emuldata *)p->p_emuldata; #else edp = 0; #endif if (edp && sigismember(&edp->ps_siginfo, sig)) setup_linux_rt_sigframe(tf, ksi, mask); else #endif /* notyet */ setup_linux_sigframe(tf, ksi, mask); /* Signal handler for trampoline code */ tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig]; /* * Linux has a custom restorer option. To support it we would * need to store an array of restorers and a sigcode block * which knew to use it. Doesn't seem worth the trouble. * -erh */ #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); #endif } /* * 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 as specified by context * left by sendsig. * Linux real-time signals use a different sigframe, * but the sigcontext is the same. */ int linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, sigset_t *mask) { struct proc *p = l->l_proc; struct pcb *pcb; /* * Linux doesn't (yet) have alternate signal stacks. * However, the OSF/1 sigcontext which they use has * an onstack member. This could be needed in the future. */ mutex_enter(p->p_lock); if (context.sc_onstack & LINUX_SA_ONSTACK) l->l_sigstk.ss_flags |= SS_ONSTACK; else l->l_sigstk.ss_flags &= ~SS_ONSTACK; /* Reset the signal mask */ (void) sigprocmask1(l, SIG_SETMASK, mask, 0); mutex_exit(p->p_lock); /* * Check for security violations. * Linux doesn't allow any changes to the PSL. */ if (context.sc_ps != ALPHA_PSL_USERMODE) return(EINVAL); l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); alpha_pal_wrusp(context.sc_regs[R_SP]); /* Restore fp regs and fpr_cr */ pcb = lwp_getpcb(l); memcpy(&pcb->pcb_fp, (struct fpreg *)context.sc_fpregs, sizeof(struct fpreg)); /* XXX sc_ownedfp ? */ /* XXX sc_fp_control ? */ #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); #endif return (EJUSTRETURN); } int linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval) { /* { syscallarg(struct linux_rt_sigframe *) sfp; } */ struct linux_rt_sigframe *sfp, sigframe; 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 = SCARG(uap, sfp); if (ALIGN(sfp) != (u_int64_t)sfp) return(EINVAL); /* * Fetch the frame structure. */ if (copyin((void *)sfp, &sigframe, sizeof(struct linux_rt_sigframe)) != 0) return (EFAULT); /* Grab the signal mask */ linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); } int linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval) { /* { syscallarg(struct linux_sigframe *) sfp; } */ 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 = SCARG(uap, sfp); if (ALIGN(sfp) != (u_int64_t)sfp) return(EINVAL); /* * Fetch the frame structure. */ if (copyin((void *)sfp, &frame, sizeof(struct linux_sigframe)) != 0) return(EFAULT); /* Grab the signal mask. */ /* XXX use frame.extramask */ linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); } /* * We come here in a last attempt to satisfy a Linux ioctl() call */ /* XXX XAX update this, add maps, etc... */ 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); } /* XXX XAX fix this */ dev_t linux_fakedev(dev_t dev, int raw) { return dev; } int linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) { return 0; }