/* $NetBSD: linux_machdep.c,v 1.43.24.1 2022/08/03 11:11:32 martin Exp $ */ /*- * Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Frank van der Linden and Emmanuel Dreyfus. * * 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 1.43.24.1 2022/08/03 11:11:32 martin 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 #include #include #include #include #include #include union linux_ksigframe { struct linux_sigframe sf; #if !defined(__mips_o32) struct linux_sigframe32 sf32; #endif }; /* * To see whether wscons is configured (for virtual console ioctl calls). */ #if defined(_KERNEL_OPT) #include "wsdisplay.h" #endif #if (NWSDISPLAY > 0) #include #include #endif /* * Set set up registers on exec. */ void linux_setregs(struct lwp *l, struct exec_package *pack, vaddr_t stack) { setregs(l, pack, stack); return; } #if !defined(__mips_o32) static void linux_setup_sigcontext32(struct linux_sigcontext32 *sc, const struct trapframe *tf) { for (u_int i = 0; i < 32; i++) { sc->lsc_regs[i] = tf->tf_regs[i]; } sc->lsc_mdhi = tf->tf_regs[_R_MULHI]; sc->lsc_mdlo = tf->tf_regs[_R_MULLO]; sc->lsc_pc = tf->tf_regs[_R_PC]; } #endif static void linux_setup_sigcontext(struct linux_sigcontext *sc, const struct trapframe *tf) { for (u_int i = 0; i < 32; i++) { sc->lsc_regs[i] = tf->tf_regs[i]; } sc->lsc_mdhi = tf->tf_regs[_R_MULHI]; sc->lsc_mdlo = tf->tf_regs[_R_MULLO]; sc->lsc_pc = tf->tf_regs[_R_PC]; } /* * Send an interrupt to process. * * Adapted from sys/arch/mips/mips/mips_machdep.c * * XXX Does not work well yet with RT signals * */ void linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) { const int sig = ksi->ksi_signo; struct lwp * const l = curlwp; struct proc * const p = l->l_proc; struct trapframe * const tf = l->l_md.md_utf; #ifdef __mips_o32 const int abi = _MIPS_BSD_API_O32; #else const int abi = p->p_md.md_abi; #endif union linux_ksigframe ksf, *sf; bool onstack; int error; sig_t catcher = SIGACTION(p, sig).sa_handler; #ifdef DEBUG_LINUX printf("linux_sendsig()\n"); #endif /* DEBUG_LINUX */ /* * 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; /* * Signal stack is broken (see at the end of linux_sigreturn), so we do * not use it yet. XXX fix this. */ onstack = false; /* * Allocate space for the signal handler context. */ sf = (void *)(onstack ? (uintptr_t) l->l_sigstk.ss_sp + l->l_sigstk.ss_size : (uintptr_t) tf->tf_regs[_R_SP]); /* * Build stack frame for signal trampoline. */ memset(&ksf, 0, sizeof ksf); /* * This is the signal trampoline used by Linux, we don't use it, * but we set it up in case an application expects it to be there */ ksf.sf.lsf_code[0] = 0x24020000; /* li v0, __NR_sigreturn */ ksf.sf.lsf_code[1] = 0x0000000c; /* syscall */ switch (abi) { default: native_to_linux_sigset(&ksf.sf.lsf_mask, mask); linux_setup_sigcontext(&ksf.sf.lsf_sc, tf); break; #if !defined(__mips_o32) case _MIPS_BSD_API_O32: native_to_linux_sigset(&ksf.sf32.lsf_mask, mask); linux_setup_sigcontext32(&ksf.sf32.lsf_sc, tf); break; #endif } sendsig_reset(l, sig); /* * Save signal stack. XXX broken */ /* kregs.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; */ /* * Install the sigframe onto the stack */ sf -= sizeof(*sf); mutex_exit(p->p_lock); error = copyout(&ksf, sf, sizeof(ksf)); mutex_enter(p->p_lock); if (error != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ #ifdef DEBUG_LINUX printf("linux_sendsig: stack trashed\n"); #endif /* DEBUG_LINUX */ sigexit(l, SIGILL); /* NOTREACHED */ } /* Set up the registers to return to sigcode. */ tf->tf_regs[_R_A0] = native_to_linux_signo[sig]; tf->tf_regs[_R_A1] = 0; tf->tf_regs[_R_A2] = (intptr_t)&sf->sf.lsf_sc; #ifdef DEBUG_LINUX printf("sigcontext is at %p\n", &sf->sf.lsf_sc); #endif /* DEBUG_LINUX */ tf->tf_regs[_R_SP] = (intptr_t)sf; /* Signal trampoline code is at base of user stack. */ tf->tf_regs[_R_RA] = (intptr_t)p->p_sigctx.ps_sigcode; tf->tf_regs[_R_T9] = (intptr_t)catcher; tf->tf_regs[_R_PC] = (intptr_t)catcher; /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; return; } static void linux_putaway_sigcontext(struct trapframe *tf, const struct linux_sigcontext *sc) { for (u_int i = 0; i < 32; i++) { tf->tf_regs[i] = sc->lsc_regs[i]; } tf->tf_regs[_R_MULLO] = sc->lsc_mdlo; tf->tf_regs[_R_MULHI] = sc->lsc_mdhi; tf->tf_regs[_R_PC] = sc->lsc_pc; } #ifndef __mips_o32 static void linux_putaway_sigcontext32(struct trapframe *tf, const struct linux_sigcontext32 *sc) { for (u_int i = 0; i < 32; i++) { tf->tf_regs[i] = sc->lsc_regs[i]; } tf->tf_regs[_R_MULLO] = sc->lsc_mdlo; tf->tf_regs[_R_MULHI] = sc->lsc_mdhi; tf->tf_regs[_R_PC] = sc->lsc_pc; } #endif /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). */ int linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval) { /* { syscallarg(struct linux_sigframe *) sf; } */ struct proc *p = l->l_proc; union linux_ksigframe ksf, *sf; #ifdef __mips_o32 const int abi = _MIPS_BSD_API_O32; #else const int abi = p->p_md.md_abi; #endif linux_sigset_t *lmask; sigset_t mask; int error; #ifdef DEBUG_LINUX printf("linux_sys_sigreturn()\n"); #endif /* DEBUG_LINUX */ /* * 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. */ sf = (void *)SCARG(uap, sf); if ((error = copyin(sf, &ksf, sizeof(ksf))) != 0) return (error); /* Restore the register context. */ switch (abi) { default: lmask = &ksf.sf.lsf_mask; linux_putaway_sigcontext(l->l_md.md_utf, &ksf.sf.lsf_sc); break; #if !defined(__mips_o32) case _MIPS_BSD_API_O32: lmask = &ksf.sf32.lsf_mask; linux_putaway_sigcontext32(l->l_md.md_utf, &ksf.sf32.lsf_sc); break; #endif } mutex_enter(p->p_lock); /* Restore signal stack. */ l->l_sigstk.ss_flags &= ~SS_ONSTACK; /* Restore signal mask. */ linux_to_native_sigset(&mask, lmask); (void)sigprocmask1(l, SIG_SETMASK, &mask, 0); mutex_exit(p->p_lock); return (EJUSTRETURN); } int linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *v, register_t *retval) { return (ENOSYS); } /* * 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) { return 0; } /* * See above. If a root process tries to set access to an I/O port, * just let it have the whole range. */ int linux_sys_ioperm(struct lwp *l, const struct linux_sys_ioperm_args *uap, register_t *retval) { /* * This syscall is not implemented in Linux/Mips: we should not be here */ #ifdef DEBUG_LINUX printf("linux_sys_ioperm: should not be here.\n"); #endif /* DEBUG_LINUX */ return 0; } /* * wrapper linux_sys_new_uname() -> linux_sys_uname() */ int linux_sys_new_uname(struct lwp *l, const struct linux_sys_new_uname_args *uap, register_t *retval) { /* * Use this if you want to try Linux emulation with a glibc-2.2 * or higher. Note that signals will not work */ #if 0 struct linux_sys_uname_args /* { syscallarg(struct linux_utsname *) up; } */ *uap = v; struct linux_utsname luts; memset(&luts, 0, sizeof(luts)); strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); strlcpy(luts.l_release, "2.4.0", sizeof(luts.l_release)); strlcpy(luts.l_version, linux_version, sizeof(luts.l_version)); strlcpy(luts.l_machine, machine, sizeof(luts.l_machine)); strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); return copyout(&luts, SCARG(uap, up), sizeof(luts)); #else return linux_sys_uname(l, (const void *)uap, retval); #endif } /* * In Linux, cacheflush is currently implemented * as a whole cache flush (arguments are ignored) * we emulate this broken beahior. */ int linux_sys_cacheflush(struct lwp *l, const struct linux_sys_cacheflush_args *uap, register_t *retval) { mips_icache_sync_all(); mips_dcache_wbinv_all(); return 0; } /* * This system call is depecated in Linux, but * some binaries and some libraries use it. */ int linux_sys_sysmips(struct lwp *l, const struct linux_sys_sysmips_args *uap, register_t *retval) { /* { syscallarg(long) cmd; syscallarg(long) arg1; syscallarg(long) arg2; syscallarg(long) arg3; } */ int error; switch (SCARG(uap, cmd)) { case LINUX_SETNAME: { char nodename [LINUX___NEW_UTS_LEN + 1]; int name[2]; size_t len; if ((error = copyinstr((char *)SCARG(uap, arg1), nodename, LINUX___NEW_UTS_LEN, &len)) != 0) return error; name[0] = CTL_KERN; name[1] = KERN_HOSTNAME; return (old_sysctl(&name[0], 2, 0, 0, nodename, len, NULL)); break; } case LINUX_MIPS_ATOMIC_SET: { void *addr; int s; u_int8_t value = 0; addr = (void *)SCARG(uap, arg1); s = splhigh(); /* * No error testing here. This is bad, but Linux does * it like this. The source aknowledge "This is broken" * in a comment... */ (void) copyin(addr, &value, 1); *retval = value; value = (u_int8_t) SCARG(uap, arg2); error = copyout(&value, addr, 1); splx(s); return 0; break; } case LINUX_MIPS_FIXADE: /* XXX not implemented */ break; case LINUX_FLUSH_CACHE: mips_icache_sync_all(); mips_dcache_wbinv_all(); break; case LINUX_MIPS_RDNVRAM: return EIO; break; default: return EINVAL; break; } #ifdef DEBUG_LINUX printf("linux_sys_sysmips(): unimplemented command %d\n", SCARG(uap,cmd)); #endif /* DEBUG_LINUX */ return 0; } int linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) { return 0; } int linux_sys_set_thread_area(struct lwp *l, const struct linux_sys_set_thread_area_args *uap, register_t *retval) { /* { syscallarg(void *) tls; } */ return lwp_setprivate(l, SCARG(uap, tls)); }