/* $OpenBSD: linux_machdep.c,v 1.34 2007/02/14 00:53:47 jsg Exp $ */ /* $NetBSD: linux_machdep.c,v 1.29 1996/05/03 19:42:11 christos Exp $ */ /* * Copyright (c) 1995 Frank van der Linden * All rights reserved. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project * by Frank van der Linden * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 #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 /* * To see whether wsdisplay is configured (for virtual console ioctl calls). */ #include "wsdisplay.h" #include #if NWSDISPLAY > 0 && defined(WSDISPLAY_COMPAT_USL) #include #include #endif #ifdef USER_LDT #include int linux_read_ldt(struct proc *, struct linux_sys_modify_ldt_args *, register_t *); int linux_write_ldt(struct proc *, struct linux_sys_modify_ldt_args *, register_t *); #endif /* * Deal with some i386-specific things in the Linux emulation code. * This means just signals for now, will include stuff like * I/O map permissions and V86 mode sometime. */ /* * 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(sig_t catcher, int sig, int mask, u_long code, int type, union sigval val) { struct proc *p = curproc; struct trapframe *tf; struct linux_sigframe *fp, frame; struct sigacts *psp = p->p_sigacts; int oonstack; tf = p->p_md.md_regs; oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; /* * Allocate space for the signal handler context. */ if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack && (psp->ps_sigonstack & sigmask(sig))) { fp = (struct linux_sigframe *)((char *)psp->ps_sigstk.ss_sp + psp->ps_sigstk.ss_size - sizeof(struct linux_sigframe)); psp->ps_sigstk.ss_flags |= SS_ONSTACK; } else { fp = (struct linux_sigframe *)tf->tf_esp - 1; } frame.sf_handler = catcher; frame.sf_sig = bsd_to_linux_sig[sig]; /* * Build the signal context to be used by sigreturn. */ frame.sf_sc.sc_mask = mask; #ifdef VM86 if (tf->tf_eflags & PSL_VM) { frame.sf_sc.sc_gs = tf->tf_vm86_gs; frame.sf_sc.sc_fs = tf->tf_vm86_fs; frame.sf_sc.sc_es = tf->tf_vm86_es; frame.sf_sc.sc_ds = tf->tf_vm86_ds; frame.sf_sc.sc_eflags = get_vflags(p); } else #endif { frame.sf_sc.sc_fs = tf->tf_fs; frame.sf_sc.sc_gs = tf->tf_gs; frame.sf_sc.sc_es = tf->tf_es; frame.sf_sc.sc_ds = tf->tf_ds; frame.sf_sc.sc_eflags = tf->tf_eflags; } frame.sf_sc.sc_edi = tf->tf_edi; frame.sf_sc.sc_esi = tf->tf_esi; frame.sf_sc.sc_ebp = tf->tf_ebp; frame.sf_sc.sc_ebx = tf->tf_ebx; frame.sf_sc.sc_edx = tf->tf_edx; frame.sf_sc.sc_ecx = tf->tf_ecx; frame.sf_sc.sc_eax = tf->tf_eax; frame.sf_sc.sc_eip = tf->tf_eip; frame.sf_sc.sc_cs = tf->tf_cs; frame.sf_sc.sc_esp_at_signal = tf->tf_esp; frame.sf_sc.sc_ss = tf->tf_ss; frame.sf_sc.sc_err = tf->tf_err; frame.sf_sc.sc_trapno = tf->tf_trapno; if (copyout(&frame, fp, sizeof(frame)) != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ sigexit(p, SIGILL); /* NOTREACHED */ } /* * Build context to run handler in. */ tf->tf_es = GSEL(GUDATA_SEL, SEL_UPL); tf->tf_ds = GSEL(GUDATA_SEL, SEL_UPL); tf->tf_eip = p->p_sigcode; tf->tf_cs = GSEL(GUCODE_SEL, SEL_UPL); tf->tf_eflags &= ~(PSL_T|PSL_VM|PSL_AC); tf->tf_esp = (int)fp; tf->tf_ss = GSEL(GUDATA_SEL, SEL_UPL); } /* * 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_sigreturn(struct proc *p, void *v, register_t *retval) { struct linux_sys_sigreturn_args /* { syscallarg(struct linux_sigcontext *) scp; } */ *uap = v; struct linux_sigcontext *scp, context; struct trapframe *tf; tf = p->p_md.md_regs; /* * 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. */ scp = SCARG(uap, scp); if (copyin((caddr_t)scp, &context, sizeof(*scp)) != 0) return (EFAULT); /* * Restore signal context. */ #ifdef VM86 if (context.sc_eflags & PSL_VM) { tf->tf_vm86_gs = context.sc_gs; tf->tf_vm86_fs = context.sc_fs; tf->tf_vm86_es = context.sc_es; tf->tf_vm86_ds = context.sc_ds; set_vflags(p, context.sc_eflags); } else #endif { /* * Check for security violations. If we're returning to * protected mode, the CPU will validate the segment registers * automatically and generate a trap on violations. We handle * the trap, rather than doing all of the checking here. */ if (((context.sc_eflags ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 || !USERMODE(context.sc_cs, context.sc_eflags)) return (EINVAL); tf->tf_fs = context.sc_fs; tf->tf_gs = context.sc_gs; tf->tf_es = context.sc_es; tf->tf_ds = context.sc_ds; tf->tf_eflags = context.sc_eflags; } tf->tf_edi = context.sc_edi; tf->tf_esi = context.sc_esi; tf->tf_ebp = context.sc_ebp; tf->tf_ebx = context.sc_ebx; tf->tf_edx = context.sc_edx; tf->tf_ecx = context.sc_ecx; tf->tf_eax = context.sc_eax; tf->tf_eip = context.sc_eip; tf->tf_cs = context.sc_cs; tf->tf_esp = context.sc_esp_at_signal; tf->tf_ss = context.sc_ss; p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; p->p_sigmask = context.sc_mask & ~sigcantmask; return (EJUSTRETURN); } int linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval) { return(ENOSYS); } #ifdef USER_LDT int linux_read_ldt(struct proc *p, struct linux_sys_modify_ldt_args *uap, register_t *retval) { struct i386_get_ldt_args gl; int error; caddr_t sg; char *parms; if (user_ldt_enable == 0) return (ENOSYS); sg = stackgap_init(p->p_emul); gl.start = 0; gl.desc = SCARG(uap, ptr); gl.num = SCARG(uap, bytecount) / sizeof(union descriptor); parms = stackgap_alloc(&sg, sizeof(gl)); if ((error = copyout(&gl, parms, sizeof(gl))) != 0) return (error); if ((error = i386_get_ldt(p, parms, retval)) != 0) return (error); *retval *= sizeof(union descriptor); return (0); } struct linux_ldt_info { u_int entry_number; u_long base_addr; u_int limit; u_int seg_32bit:1; u_int contents:2; u_int read_exec_only:1; u_int limit_in_pages:1; u_int seg_not_present:1; }; int linux_write_ldt(struct proc *p, struct linux_sys_modify_ldt_args *uap, register_t *retval) { struct linux_ldt_info ldt_info; struct segment_descriptor sd; struct i386_set_ldt_args sl; int error; caddr_t sg; char *parms; if (user_ldt_enable == 0) return (ENOSYS); if (SCARG(uap, bytecount) != sizeof(ldt_info)) return (EINVAL); if ((error = copyin(SCARG(uap, ptr), &ldt_info, sizeof(ldt_info))) != 0) return error; if (ldt_info.contents == 3) return (EINVAL); sg = stackgap_init(p->p_emul); sd.sd_lobase = ldt_info.base_addr & 0xffffff; sd.sd_hibase = (ldt_info.base_addr >> 24) & 0xff; sd.sd_lolimit = ldt_info.limit & 0xffff; sd.sd_hilimit = (ldt_info.limit >> 16) & 0xf; sd.sd_type = 16 | (ldt_info.contents << 2) | (!ldt_info.read_exec_only << 1); sd.sd_dpl = SEL_UPL; sd.sd_p = !ldt_info.seg_not_present; sd.sd_def32 = ldt_info.seg_32bit; sd.sd_gran = ldt_info.limit_in_pages; sl.start = ldt_info.entry_number; sl.desc = stackgap_alloc(&sg, sizeof(sd)); sl.num = 1; #if 0 printf("linux_write_ldt: idx=%d, base=%x, limit=%x\n", ldt_info.entry_number, ldt_info.base_addr, ldt_info.limit); #endif parms = stackgap_alloc(&sg, sizeof(sl)); if ((error = copyout(&sd, sl.desc, sizeof(sd))) != 0) return (error); if ((error = copyout(&sl, parms, sizeof(sl))) != 0) return (error); if ((error = i386_set_ldt(p, parms, retval)) != 0) return (error); *retval = 0; return (0); } #endif /* USER_LDT */ int linux_sys_modify_ldt(struct proc *p, void *v, register_t *retval) { struct linux_sys_modify_ldt_args /* { syscallarg(int) func; syscallarg(void *) ptr; syscallarg(size_t) bytecount; } */ *uap = v; switch (SCARG(uap, func)) { #ifdef USER_LDT case 0: return (linux_read_ldt(p, uap, retval)); case 1: return (linux_write_ldt(p, uap, retval)); #endif /* USER_LDT */ default: return (ENOSYS); } } /* * XXX Pathetic hack to make svgalib work. This will fake the major * device number of an opened VT so that svgalib likes it. grmbl. * Should probably do it 'wrong the right way' and use a mapping * array for all major device numbers, and map linux_mknod too. */ dev_t linux_fakedev(dev_t dev) { if (major(dev) == NATIVE_CONS_MAJOR) return makedev(LINUX_CONS_MAJOR, (minor(dev) + 1)); return dev; } /* * We come here in a last attempt to satisfy a Linux ioctl() call */ int linux_machdepioctl(struct proc *p, void *v, register_t *retval) { struct linux_sys_ioctl_args /* { syscallarg(int) fd; syscallarg(u_long) com; syscallarg(caddr_t) data; } */ *uap = v; struct sys_ioctl_args bia; u_long com; int error; #if (NWSDISPLAY > 0 && defined(WSDISPLAY_COMPAT_USL)) struct vt_mode lvt; caddr_t bvtp, sg; #endif struct filedesc *fdp; struct file *fp; int fd; int (*ioctlf)(struct file *, u_long, caddr_t, struct proc *); struct ioctl_pt pt; fd = SCARG(uap, fd); SCARG(&bia, fd) = SCARG(uap, fd); SCARG(&bia, data) = SCARG(uap, data); com = SCARG(uap, com); fdp = p->p_fd; if ((fp = fd_getfile(fdp, fd)) == NULL) return (EBADF); switch (com) { #if (NWSDISPLAY > 0 && defined(WSDISPLAY_COMPAT_USL)) case LINUX_KDGKBMODE: com = KDGKBMODE; break; case LINUX_KDSKBMODE: com = KDSKBMODE; if ((unsigned)SCARG(uap, data) == LINUX_K_MEDIUMRAW) SCARG(&bia, data) = (caddr_t)K_RAW; break; case LINUX_KIOCSOUND: SCARG(&bia, data) = (caddr_t)(((unsigned long)SCARG(&bia, data)) & 0xffff); /* FALLTHROUGH */ case LINUX_KDMKTONE: com = KDMKTONE; break; case LINUX_KDSETMODE: com = KDSETMODE; break; case LINUX_KDGETMODE: #if NWSDISPLAY > 0 && defined(WSDISPLAY_COMPAT_USL) com = WSDISPLAYIO_GMODE; #else com = KDGETMODE; #endif break; case LINUX_KDENABIO: com = KDENABIO; break; case LINUX_KDDISABIO: com = KDDISABIO; break; case LINUX_KDGETLED: com = KDGETLED; break; case LINUX_KDSETLED: com = KDSETLED; break; case LINUX_VT_OPENQRY: com = VT_OPENQRY; break; case LINUX_VT_GETMODE: { int sig; SCARG(&bia, com) = VT_GETMODE; if ((error = sys_ioctl(p, &bia, retval))) return error; if ((error = copyin(SCARG(uap, data), (caddr_t)&lvt, sizeof (struct vt_mode)))) return error; /* We need to bounds check here in case there is a race with another thread */ if ((error = bsd_to_linux_signal(lvt.relsig, &sig))) return error; lvt.relsig = sig; if ((error = bsd_to_linux_signal(lvt.acqsig, &sig))) return error; lvt.acqsig = sig; if ((error = bsd_to_linux_signal(lvt.frsig, &sig))) return error; lvt.frsig = sig; return copyout((caddr_t)&lvt, SCARG(uap, data), sizeof (struct vt_mode)); } case LINUX_VT_SETMODE: { int sig; com = VT_SETMODE; if ((error = copyin(SCARG(uap, data), (caddr_t)&lvt, sizeof (struct vt_mode)))) return error; if ((error = linux_to_bsd_signal(lvt.relsig, &sig))) return error; lvt.relsig = sig; if ((error = linux_to_bsd_signal(lvt.acqsig, &sig))) return error; lvt.acqsig = sig; if ((error = linux_to_bsd_signal(lvt.frsig, &sig))) return error; lvt.frsig = sig; sg = stackgap_init(p->p_emul); bvtp = stackgap_alloc(&sg, sizeof (struct vt_mode)); if ((error = copyout(&lvt, bvtp, sizeof (struct vt_mode)))) return error; SCARG(&bia, data) = bvtp; break; } case LINUX_VT_DISALLOCATE: /* XXX should use WSDISPLAYIO_DELSCREEN */ return 0; case LINUX_VT_RELDISP: com = VT_RELDISP; break; case LINUX_VT_ACTIVATE: com = VT_ACTIVATE; break; case LINUX_VT_WAITACTIVE: com = VT_WAITACTIVE; break; case LINUX_VT_GETSTATE: com = VT_GETSTATE; break; case LINUX_KDGKBTYPE: { char tmp = KB_101; /* This is what Linux does */ return copyout(&tmp, SCARG(uap, data), sizeof(char)); } #endif default: /* * Unknown to us. If it's on a device, just pass it through * using PTIOCLINUX, the device itself might be able to * make some sense of it. * XXX hack: if the function returns EJUSTRETURN, * it has stuffed a sysctl return value in pt.data. */ FREF(fp); ioctlf = fp->f_ops->fo_ioctl; pt.com = SCARG(uap, com); pt.data = SCARG(uap, data); error = ioctlf(fp, PTIOCLINUX, (caddr_t)&pt, p); FRELE(fp); if (error == EJUSTRETURN) { retval[0] = (register_t)pt.data; error = 0; } if (error == ENOTTY) printf("linux_machdepioctl: invalid ioctl %08lx\n", com); return (error); } SCARG(&bia, com) = com; return sys_ioctl(p, &bia, retval); } /* * Set I/O permissions for a process. Just set the maximum level * right away (ignoring the argument), otherwise we would have * to rely on I/O permission maps, which are not implemented. */ int linux_sys_iopl(struct proc *p, void *v, register_t *retval) { #if 0 struct linux_sys_iopl_args /* { syscallarg(int) level; } */ *uap = v; #endif struct trapframe *fp = p->p_md.md_regs; if (suser(p, 0) != 0) return EPERM; if (securelevel > 0) return EPERM; fp->tf_eflags |= PSL_IOPL; *retval = 0; 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 proc *p, void *v, register_t *retval) { struct linux_sys_ioperm_args /* { syscallarg(unsigned int) lo; syscallarg(unsigned int) hi; syscallarg(int) val; } */ *uap = v; struct trapframe *fp = p->p_md.md_regs; if (suser(p, 0) != 0) return EPERM; if (securelevel > 0) return EPERM; if (SCARG(uap, val)) fp->tf_eflags |= PSL_IOPL; *retval = 0; return 0; }