/* $NetBSD: linux_machdep.c,v 1.44 2022/08/07 20:14:01 tsutsui Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by ITOH Yasufumi. * * 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 1.44 2022/08/07 20:14:01 tsutsui Exp $"); #define COMPAT_LINUX 1 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* XXX should be in an include file somewhere */ #define CC_PURGE 1 #define CC_FLUSH 2 #define CC_IPURGE 4 #define CC_EXTPURGE 0x80000000 /* XXX end should be */ extern short exframesize[]; #ifdef DEBUG extern int sigdebug; extern int sigpid; #define SDB_FOLLOW 0x01 #define SDB_KSTACK 0x02 #define SDB_FPSTATE 0x04 #endif void setup_linux_sigframe(struct frame *frame, int sig, const sigset_t *mask, void *usp); void setup_linux_rt_sigframe(struct frame *frame, int sig, const sigset_t *mask, void *usp, struct lwp *l); /* * Deal with some m68k-specific things in the Linux emulation code. */ /* * Setup registers on program execution. */ void linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) { setregs(l, epp, stack); } /* * Setup signal frame for old signal interface. */ void setup_linux_sigframe(struct frame *frame, int sig, const sigset_t *mask, void *usp) { struct lwp *l = curlwp; struct proc *p = l->l_proc; struct linux_sigframe *fp, kf; short ft; int error; ft = frame->f_format; /* Allocate space for the signal handler context on the user stack. */ fp = (struct linux_sigframe *) usp; fp--; #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("setup_linux_sigframe(%d): sig %d ssp %p usp %p scp %p ft %d\n", p->p_pid, sig, &ft, fp, &fp->sf_c.c_sc, ft); #endif memset(&kf, 0, sizeof(kf)); /* Build stack frame. */ kf.sf_psigtramp = fp->sf_sigtramp; /* return addr for handler */ kf.sf_signum = native_to_linux_signo[sig]; kf.sf_code = frame->f_vector; /* Does anyone use it? */ kf.sf_scp = &fp->sf_c.c_sc; /* The sigtramp code is on the stack frame on Linux/m68k. */ kf.sf_sigtramp[0] = LINUX_SF_SIGTRAMP0; kf.sf_sigtramp[1] = LINUX_SF_SIGTRAMP1; /* * Save necessary hardware state. Currently this includes: * - scratch registers * - original exception frame (if not a "normal" frame) * - FP coprocessor state */ kf.sf_c.c_sc.sc_d0 = frame->f_regs[D0]; kf.sf_c.c_sc.sc_d1 = frame->f_regs[D1]; kf.sf_c.c_sc.sc_a0 = frame->f_regs[A0]; kf.sf_c.c_sc.sc_a1 = frame->f_regs[A1]; /* Clear for security (and initialize ss_format). */ memset(&kf.sf_c.c_sc.sc_ss, 0, sizeof kf.sf_c.c_sc.sc_ss); if (ft >= FMT4) { #ifdef DEBUG if (ft > 15 || exframesize[ft] < 0) panic("setup_linux_sigframe: bogus frame type"); #endif kf.sf_c.c_sc.sc_ss.ss_format = ft; kf.sf_c.c_sc.sc_ss.ss_vector = frame->f_vector; memcpy(&kf.sf_c.c_sc.sc_ss.ss_frame, &frame->F_u, (size_t) exframesize[ft]); /* * Leave an indicator that we need to clean up the kernel * stack. We do this by setting the "pad word" above the * hardware stack frame to the amount the stack must be * adjusted by. * * N.B. we increment rather than just set f_stackadj in * case we are called from syscall when processing a * sigreturn. In that case, f_stackadj may be non-zero. */ frame->f_stackadj += exframesize[ft]; frame->f_format = frame->f_vector = 0; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("setup_linux_sigframe(%d): copy out %d of frame %d\n", p->p_pid, exframesize[ft], ft); #endif } switch (fputype) { case FPU_NONE: break; #ifdef M68060 case FPU_68060: __asm("fsave %0" : "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.FPF_u1) : : "memory"); if (((struct fpframe060 *)&kf.sf_c.c_sc.sc_ss.ss_fpstate.FPF_u1) ->fpf6_frmfmt != FPF6_FMT_NULL) { __asm("fmovem %%fp0-%%fp1,%0" : "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_regs[0][0])); /* * On 060, "fmovem fpcr/fpsr/fpi," is * emulated by software and slow. */ __asm("fmovem %%fpcr,%0; fmovem %%fpsr,%1; fmovem %%fpi,%2" : "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpcr), "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpsr), "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpiar)); } break; #endif default: __asm("fsave %0" : "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.FPF_u1) : : "memory"); if (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_version) { __asm("fmovem %%fp0-%%fp1,%0; fmovem %%fpcr/%%fpsr/%%fpi,%1" : "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_regs[0][0]), "=m" (kf.sf_c.c_sc.sc_ss.ss_fpstate.fpf_fpcr) : : "memory"); } break; } #ifdef DEBUG if ((sigdebug & SDB_FPSTATE) && *(char *)&kf.sf_c.c_sc.sc_ss.ss_fpstate) printf("setup_linux_sigframe(%d): copy out FP state (%x) to %p\n", p->p_pid, *(u_int *)&kf.sf_c.c_sc.sc_ss.ss_fpstate, &kf.sf_c.c_sc.sc_ss.ss_fpstate); #endif /* Build the signal context to be used by sigreturn. */ #if LINUX__NSIG_WORDS > 1 native_to_linux_old_extra_sigset(&kf.sf_c.c_sc.sc_mask, kf.sf_c.c_extrasigmask, mask); #else native_to_linux_old_sigset(&kf.sf_c.c_sc.sc_mask, mask); #endif kf.sf_c.c_sc.sc_sp = frame->f_regs[SP]; kf.sf_c.c_sc.sc_pc = frame->f_pc; kf.sf_c.c_sc.sc_ps = frame->f_sr; sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout(&kf, fp, sizeof(struct linux_sigframe)); mutex_enter(p->p_lock); if (error) { #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("setup_linux_sigframe(%d): copyout failed on sig %d\n", p->p_pid, sig); #endif /* * Process has trashed its stack; give it a segmentation * violation to halt it in its tracks. */ sigexit(l, SIGSEGV); /* NOTREACHED */ } /* * The signal trampoline is on the signal frame. * Clear the instruction cache in case of cached. */ cachectl1(CC_EXTPURGE | CC_IPURGE, (vaddr_t) fp->sf_sigtramp, sizeof fp->sf_sigtramp, p); /* Set up the user stack pointer. */ frame->f_regs[SP] = (int)fp; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("setup_linux_sigframe(%d): sig %d scp %p fp %p sc_sp %x\n", p->p_pid, sig, kf.sf_scp, fp, kf.sf_c.c_sc.sc_sp); #endif } /* * Setup signal frame for new RT signal interface. */ void setup_linux_rt_sigframe(struct frame *frame, int sig, const sigset_t *mask, void *usp, struct lwp *l) { struct proc *p = l->l_proc; struct linux_rt_sigframe *fp, kf; int error; short ft; ft = frame->f_format; /* Allocate space for the signal handler context on the user stack. */ fp = (struct linux_rt_sigframe *) usp; fp--; #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("setup_linux_rt_sigframe(%d): sig %d ssp %p usp %p ucp %p ft %d\n", p->p_pid, sig, &ft, fp, &fp->sf_uc, ft); #endif memset(&kf, 0, sizeof(kf)); /* Build stack frame. */ kf.sf_psigtramp = fp->sf_sigtramp; /* return addr for handler */ kf.sf_signum = native_to_linux_signo[sig]; kf.sf_pinfo = &fp->sf_info; kf.sf_puc = &fp->sf_uc; /* The sigtramp code is on the stack frame on Linux/m68k. */ kf.sf_sigtramp[0] = LINUX_RT_SF_SIGTRAMP0; kf.sf_sigtramp[1] = LINUX_RT_SF_SIGTRAMP1; /* clear for security (and initialize uc_flags, ss_format, etc.). */ memset(&kf.sf_uc, 0, sizeof(struct linux_ucontext)); /* * Save necessary hardware state. Currently this includes: * - general registers * - original exception frame (if not a "normal" frame) * - FP coprocessor state */ /* version of mcontext */ kf.sf_uc.uc_mc.mc_version = LINUX_MCONTEXT_VERSION; /* general registers and pc/sr */ memcpy(kf.sf_uc.uc_mc.mc_gregs.gr_regs, frame->f_regs, sizeof(u_int)*16); kf.sf_uc.uc_mc.mc_gregs.gr_pc = frame->f_pc; kf.sf_uc.uc_mc.mc_gregs.gr_sr = frame->f_sr; if (ft >= FMT4) { #ifdef DEBUG if (ft > 15 || exframesize[ft] < 0) panic("setup_linux_rt_sigframe: bogus frame type"); #endif kf.sf_uc.uc_ss.ss_format = ft; kf.sf_uc.uc_ss.ss_vector = frame->f_vector; memcpy(&kf.sf_uc.uc_ss.ss_frame, &frame->F_u, (size_t) exframesize[ft]); /* * Leave an indicator that we need to clean up the kernel * stack. We do this by setting the "pad word" above the * hardware stack frame to the amount the stack must be * adjusted by. * * N.B. we increment rather than just set f_stackadj in * case we are called from syscall when processing a * sigreturn. In that case, f_stackadj may be non-zero. */ frame->f_stackadj += exframesize[ft]; frame->f_format = frame->f_vector = 0; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("setup_linux_rt_sigframe(%d): copy out %d of frame %d\n", p->p_pid, exframesize[ft], ft); #endif } switch (fputype) { case FPU_NONE: break; #ifdef M68060 case FPU_68060: __asm("fsave %0" : "=m" (kf.sf_uc.uc_ss.ss_fpstate)); /* See note below. */ if (((struct fpframe060 *) &kf.sf_uc.uc_ss.ss_fpstate.FPF_u1) ->fpf6_frmfmt != FPF6_FMT_NULL) { __asm("fmovem %%fp0-%%fp7,%0" : "=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_regs[0][0])); /* * On 060, "fmovem fpcr/fpsr/fpi," is * emulated by software and slow. */ __asm("fmovem %%fpcr,%0; fmovem %%fpsr,%1; fmovem %%fpi,%2" : "=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpcr), "=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpsr), "=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpiar)); } break; #endif default: /* * NOTE: We give whole of the "struct linux_rt_fpframe" * to the __asm("fsave") argument; not the FPF_u1 element only. * Unlike the non-RT version of this structure, * this contains only the FPU state used by "fsave" * (and whole of the information is in the structure). * This gives the correct dependency information to the __asm(), * and no "memory" is required to the ``clobberd'' list. */ __asm("fsave %0" : "=m" (kf.sf_uc.uc_ss.ss_fpstate)); if (kf.sf_uc.uc_ss.ss_fpstate.fpf_version) { __asm("fmovem %%fp0-%%fp7,%0; fmovem %%fpcr/%%fpsr/%%fpi,%1" : "=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_regs[0][0]), "=m" (kf.sf_uc.uc_mc.mc_fpregs.fpr_fpcr) : : "memory"); } break; } #ifdef DEBUG if ((sigdebug & SDB_FPSTATE) && *(char *)&kf.sf_uc.uc_ss.ss_fpstate) printf("setup_linux_rt_sigframe(%d): copy out FP state (%x) to %p\n", p->p_pid, *(u_int *)&kf.sf_uc.uc_ss.ss_fpstate, &kf.sf_uc.uc_ss.ss_fpstate); #endif /* * XXX XAX Create bogus siginfo data. This can't really * XXX be fixed until NetBSD has realtime signals. * XXX Or we do the emuldata thing. * XXX -erh */ memset(&kf.sf_info, 0, sizeof(struct linux_siginfo)); kf.sf_info.lsi_signo = sig; kf.sf_info.lsi_code = LINUX_SI_USER; kf.sf_info.lsi_pid = p->p_pid; kf.sf_info.lsi_uid = kauth_cred_geteuid(l->l_cred); /* Use real uid here? */ /* Build the signal context to be used by sigreturn. */ native_to_linux_sigset(&kf.sf_uc.uc_sigmask, mask); kf.sf_uc.uc_stack.ss_sp = l->l_sigstk.ss_sp; kf.sf_uc.uc_stack.ss_flags = (l->l_sigstk.ss_flags & SS_ONSTACK ? LINUX_SS_ONSTACK : 0) | (l->l_sigstk.ss_flags & SS_DISABLE ? LINUX_SS_DISABLE : 0); kf.sf_uc.uc_stack.ss_size = l->l_sigstk.ss_size; sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout(&kf, fp, sizeof(struct linux_rt_sigframe)); mutex_enter(p->p_lock); if (error) { #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("setup_linux_rt_sigframe(%d): copyout failed on sig %d\n", p->p_pid, sig); #endif /* * Process has trashed its stack; give it a segmentation * violation to halt it in its tracks. */ sigexit(l, SIGSEGV); /* NOTREACHED */ } /* * The signal trampoline is on the signal frame. * Clear the instruction cache in case of cached. */ cachectl1(CC_EXTPURGE | CC_IPURGE, (vaddr_t) fp->sf_sigtramp, sizeof fp->sf_sigtramp, p); /* Set up the user stack pointer. */ frame->f_regs[SP] = (int)fp; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("setup_linux_rt_sigframe(%d): sig %d puc %p fp %p sc_sp %x\n", p->p_pid, sig, kf.sf_puc, fp, kf.sf_uc.uc_mc.mc_gregs.gr_regs[SP]); #endif } /* * Send an interrupt to Linux process. */ void linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) { /* u_long code = ksi->ksi_trap; */ int sig = ksi->ksi_signo; struct lwp *l = curlwp; struct proc *p = l->l_proc; struct frame *frame = (struct frame *)l->l_md.md_regs; int onstack; /* user stack for signal context */ void *usp = getframe(l, sig, &onstack); sig_t catcher = SIGACTION(p, sig).sa_handler; /* Setup the signal frame (and part of the trapframe). */ if (SIGACTION(p, sig).sa_flags & SA_SIGINFO) setup_linux_rt_sigframe(frame, sig, mask, usp, l); else setup_linux_sigframe(frame, sig, mask, usp); /* Call the signal handler. */ frame->f_pc = (u_int) catcher; /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("linux_sendsig(%d): sig %d returns\n", p->p_pid, sig); #endif } /* * The linux_sys_sigreturn and linux_sys_rt_sigreturn * system calls cleanup state after a signal * has been taken. Reset signal mask and stack * state from context left by linux_sendsig (above). * Return to previous pc and psl as specified by * context left by linux_sendsig. Check carefully to * make sure that the user has not modified the * psl to gain improper privileges or to cause * a machine fault. * * Note that the sigreturn system calls of Linux/m68k * do not return on errors, but issue segmentation * violation and terminate the process. */ /* ARGSUSED */ int linux_sys_sigreturn(struct lwp *l, const void *v, register_t *retval) { struct proc *p = l->l_proc; struct frame *frame; struct linux_sigc2 tsigc2; /* extra mask and sigcontext */ struct linux_sigcontext *scp; /* pointer to sigcontext */ sigset_t mask; int sz = 0; /* extra frame size */ int usp; /* * sigreturn of Linux/m68k takes no arguments. * The user stack points at struct linux_sigc2. */ frame = (struct frame *) l->l_md.md_regs; usp = frame->f_regs[SP]; if (usp & 1) goto bad; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("linux_sys_sigreturn: pid %d, usp %p\n", p->p_pid, (void *) usp); #endif /* Grab whole of the sigcontext. */ if (copyin((void *) usp, &tsigc2, sizeof tsigc2)) { bad: mutex_enter(p->p_lock); sigexit(l, SIGSEGV); } scp = &tsigc2.c_sc; /* * Check kernel stack and re-enter to syscall() if needed. */ if ((sz = scp->sc_ss.ss_format) != 0) { if ((sz = exframesize[sz]) < 0) goto bad; if (sz && frame->f_stackadj == 0) { /* * Extra stack space is required but not allocated. * Allocate and re-enter syscall(). */ reenter_syscall(frame, sz); /* NOTREACHED */ } } #ifdef DEBUG /* reenter_syscall() doesn't adjust stack. */ if (sz != frame->f_stackadj) panic("linux_sys_sigreturn: adj: %d != %d", sz, frame->f_stackadj); #endif mutex_enter(p->p_lock); /* Restore signal stack. */ l->l_sigstk.ss_flags &= ~SS_ONSTACK; /* Restore signal mask. */ #if LINUX__NSIG_WORDS > 1 linux_old_extra_to_native_sigset(&mask, &scp->sc_mask, tsigc2.c_extrasigmask); #else linux_old_to_native_sigset(&scp->sc_mask, &mask); #endif (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); mutex_exit(p->p_lock); /* * Restore the user supplied information. */ frame->f_regs[SP] = scp->sc_sp; frame->f_regs[D0] = scp->sc_d0; frame->f_regs[D1] = scp->sc_d1; frame->f_regs[A0] = scp->sc_a0; frame->f_regs[A1] = scp->sc_a1; frame->f_pc = scp->sc_pc; /* Privileged bits of sr are silently ignored on Linux/m68k. */ frame->f_sr = scp->sc_ps & ~(PSL_MBZ|PSL_IPL|PSL_S); /* * Other registers are assumed to be unchanged, * and not restored. */ /* * Restore long stack frames. Note that we do not copy * back the saved SR or PC, they were picked up above from * the sigcontext structure. */ if (scp->sc_ss.ss_format) { frame->f_format = scp->sc_ss.ss_format; frame->f_vector = scp->sc_ss.ss_vector; if (frame->f_stackadj < sz) /* just in case... */ goto bad; frame->f_stackadj -= sz; memcpy(&frame->F_u, &scp->sc_ss.ss_frame, sz); #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("linux_sys_sigreturn(%d): copy in %d of frame type %d\n", p->p_pid, sz, scp->sc_ss.ss_format); #endif } /* * Finally we restore the original FP context. */ switch (fputype) { case FPU_NONE: break; #ifdef M68060 case FPU_68060: if (((struct fpframe060*)&scp->sc_ss.ss_fpstate.FPF_u1) ->fpf6_frmfmt != FPF6_FMT_NULL) { /* * On 060, "fmovem ,fpcr/fpsr/fpi" is * emulated by software and slow. */ __asm("fmovem %0,%%fpcr; fmovem %1,%%fpsr; fmovem %2,%%fpi":: "m" (scp->sc_ss.ss_fpstate.fpf_fpcr), "m" (scp->sc_ss.ss_fpstate.fpf_fpsr), "m" (scp->sc_ss.ss_fpstate.fpf_fpiar)); __asm("fmovem %0,%%fp0-%%fp1" : : "m" (scp->sc_ss.ss_fpstate.fpf_regs[0][0])); } __asm("frestore %0" : : "m" (scp->sc_ss.ss_fpstate.FPF_u1)); break; #endif default: if (scp->sc_ss.ss_fpstate.fpf_version) { __asm("fmovem %0,%%fpcr/%%fpsr/%%fpi; fmovem %1,%%fp0-%%fp1":: "m" (scp->sc_ss.ss_fpstate.fpf_fpcr), "m" (scp->sc_ss.ss_fpstate.fpf_regs[0][0])); } __asm("frestore %0" : : "m" (scp->sc_ss.ss_fpstate.FPF_u1)); break; } #ifdef DEBUG if ((sigdebug & SDB_FPSTATE) && *(char *)&scp->sc_ss.ss_fpstate) printf("linux_sys_sigreturn(%d): copied in FP state (%x) at %p\n", p->p_pid, *(u_int *)&scp->sc_ss.ss_fpstate, &scp->sc_ss.ss_fpstate); if ((sigdebug & SDB_FOLLOW) || ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)) printf("linux_sys_sigreturn(%d): returns\n", p->p_pid); #endif return EJUSTRETURN; } /* ARGSUSED */ int linux_sys_rt_sigreturn(struct lwp *l, const void *v, register_t *retval) { struct proc *p = l->l_proc; struct frame *frame; struct linux_ucontext *ucp; /* ucontext in user space */ struct linux_ucontext tuc; /* copy of *ucp */ sigset_t mask; int sz = 0, error; /* extra frame size */ /* * rt_sigreturn of Linux/m68k takes no arguments. * usp + 4 is a pointer to siginfo structure, * usp + 8 is a pointer to ucontext structure. */ frame = (struct frame *) l->l_md.md_regs; error = copyin((char *)frame->f_regs[SP] + 8, (void *)&ucp, sizeof(void *)); if (error || (int) ucp & 1) goto bad; /* error or odd address */ #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("linux_rt_sigreturn: pid %d, ucp %p\n", p->p_pid, ucp); #endif /* Grab whole of the ucontext. */ if (copyin(ucp, &tuc, sizeof tuc)) { bad: mutex_enter(p->p_lock); sigexit(l, SIGSEGV); } /* * Check kernel stack and re-enter to syscall() if needed. */ if ((sz = tuc.uc_ss.ss_format) != 0) { if ((sz = exframesize[sz]) < 0) goto bad; if (sz && frame->f_stackadj == 0) { /* * Extra stack space is required but not allocated. * Allocate and re-enter syscall(). */ reenter_syscall(frame, sz); /* NOTREACHED */ } } #ifdef DEBUG /* reenter_syscall() doesn't adjust stack. */ if (sz != frame->f_stackadj) panic("linux_sys_rt_sigreturn: adj: %d != %d", sz, frame->f_stackadj); #endif if (tuc.uc_mc.mc_version != LINUX_MCONTEXT_VERSION) goto bad; mutex_enter(p->p_lock); /* Restore signal stack. */ l->l_sigstk.ss_flags = (l->l_sigstk.ss_flags & ~SS_ONSTACK) | (tuc.uc_stack.ss_flags & LINUX_SS_ONSTACK ? SS_ONSTACK : 0); /* Restore signal mask. */ linux_to_native_sigset(&mask, &tuc.uc_sigmask); (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); mutex_exit(p->p_lock); /* * Restore the user supplied information. */ memcpy(frame->f_regs, tuc.uc_mc.mc_gregs.gr_regs, sizeof(u_int)*16); frame->f_pc = tuc.uc_mc.mc_gregs.gr_pc; /* Privileged bits of sr are silently ignored on Linux/m68k. */ frame->f_sr = tuc.uc_mc.mc_gregs.gr_sr & ~(PSL_MBZ|PSL_IPL|PSL_S); /* * Restore long stack frames. Note that we do not copy * back the saved SR or PC, they were picked up above from * the ucontext structure. */ if (tuc.uc_ss.ss_format) { frame->f_format = tuc.uc_ss.ss_format; frame->f_vector = tuc.uc_ss.ss_vector; if (frame->f_stackadj < sz) /* just in case... */ goto bad; frame->f_stackadj -= sz; memcpy(&frame->F_u, &tuc.uc_ss.ss_frame, sz); #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("linux_sys_rt_sigreturn(%d): copy in %d of frame type %d\n", p->p_pid, sz, tuc.uc_ss.ss_format); #endif } /* * Finally we restore the original FP context. */ switch (fputype) { case FPU_NONE: break; #ifdef M68060 case FPU_68060: if (((struct fpframe060*)&tuc.uc_ss.ss_fpstate.FPF_u1) ->fpf6_frmfmt != FPF6_FMT_NULL) { /* * On 060, "fmovem ,fpcr/fpsr/fpi" is * emulated by software and slow. */ __asm("fmovem %0,%%fpcr; fmovem %1,%%fpsr; fmovem %2,%%fpi":: "m" (tuc.uc_mc.mc_fpregs.fpr_fpcr), "m" (tuc.uc_mc.mc_fpregs.fpr_fpsr), "m" (tuc.uc_mc.mc_fpregs.fpr_fpiar)); __asm("fmovem %0,%%fp0-%%fp1" : : "m" (tuc.uc_mc.mc_fpregs.fpr_regs[0][0])); } __asm("frestore %0" : : "m" (tuc.uc_ss.ss_fpstate.FPF_u1)); break; #endif default: if (tuc.uc_ss.ss_fpstate.fpf_version) { __asm("fmovem %0,%%fpcr/%%fpsr/%%fpi; fmovem %1,%%fp0-%%fp1":: "m" (tuc.uc_mc.mc_fpregs.fpr_fpcr), "m" (tuc.uc_mc.mc_fpregs.fpr_regs[0][0])); } __asm("frestore %0" : : "m" (tuc.uc_ss.ss_fpstate.FPF_u1)); break; } #ifdef DEBUG if ((sigdebug & SDB_FPSTATE) && *(char *)&tuc.uc_ss.ss_fpstate) printf("linux_rt_sigreturn(%d): copied in FP state (%x) at %p\n", p->p_pid, *(u_int *)&tuc.uc_ss.ss_fpstate, &tuc.uc_ss.ss_fpstate); if ((sigdebug & SDB_FOLLOW) || ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)) printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); #endif return EJUSTRETURN; } /* * MPU cache operation of Linux/m68k, * mainly used for dynamic linking. */ /* scope */ #define LINUX_FLUSH_SCOPE_LINE 1 /* a cache line */ #define LINUX_FLUSH_SCOPE_PAGE 2 /* a page */ #define LINUX_FLUSH_SCOPE_ALL 3 /* the whole cache */ /* cache */ #define LINUX_FLUSH_CACHE_DATA 1 /* flush and purge data cache */ #define LINUX_FLUSH_CACHE_INSN 2 /* purge instruction cache */ #define LINUX_FLUSH_CACHE_BOTH 3 /* both */ /* ARGSUSED */ int linux_sys_cacheflush(struct lwp *l, const struct linux_sys_cacheflush_args *uap, register_t *retval) { /* { syscallarg(unsigned long) addr; syscallarg(int) scope; syscallarg(int) cache; syscallarg(unsigned long) len; } */ struct proc *p = l->l_proc; int scope, cache; vaddr_t addr; int len; int error; scope = SCARG(uap, scope); cache = SCARG(uap, cache); if (scope < LINUX_FLUSH_SCOPE_LINE || scope > LINUX_FLUSH_SCOPE_ALL || cache & ~LINUX_FLUSH_CACHE_BOTH) return EINVAL; #if defined(M68040) || defined(M68060) addr = (vaddr_t) SCARG(uap, addr); len = (int) SCARG(uap, len); #else /* * We always flush entire cache on 68020/030 * and these values are not used afterwards. */ addr = 0; len = 0; #endif /* * LINUX_FLUSH_SCOPE_ALL (flush whole cache) is limited to super users. */ if (scope == LINUX_FLUSH_SCOPE_ALL) { if ((error = kauth_authorize_machdep(l->l_cred, KAUTH_MACHDEP_CACHEFLUSH, NULL, NULL, NULL, NULL)) != 0) return error; #if defined(M68040) || defined(M68060) /* entire cache */ len = INT_MAX; #endif } error = 0; if (cache & LINUX_FLUSH_CACHE_DATA) if ((error = cachectl1(CC_EXTPURGE|CC_PURGE, addr, len, p)) !=0) return error; if (cache & LINUX_FLUSH_CACHE_INSN) error = cachectl1(CC_EXTPURGE|CC_IPURGE, addr, len, p); return error; } /* * Convert NetBSD's devices to Linux's. */ dev_t linux_fakedev(dev_t dev, int raw) { /* do nothing for now */ 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) { /* do nothing for now */ 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; }