1 /* $NetBSD: linux_machdep.c,v 1.35 2026/09/20 13:43:51 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 34 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.35 2026/09/20 13:43:51 riastradh Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/signalvar.h> 39 #include <sys/kernel.h> 40 #include <sys/proc.h> 41 #include <sys/buf.h> 42 #include <sys/reboot.h> 43 #include <sys/conf.h> 44 #include <sys/exec.h> 45 #include <sys/file.h> 46 #include <sys/callout.h> 47 #include <sys/mbuf.h> 48 #include <sys/msgbuf.h> 49 #include <sys/mount.h> 50 #include <sys/vnode.h> 51 #include <sys/device.h> 52 #include <sys/syscallargs.h> 53 #include <sys/filedesc.h> 54 #include <sys/exec_elf.h> 55 #include <sys/disklabel.h> 56 #include <sys/ioctl.h> 57 58 #include <miscfs/specfs/specdev.h> 59 60 #include <compat/linux/common/linux_types.h> 61 #include <compat/linux/common/linux_signal.h> 62 #include <compat/linux/common/linux_util.h> 63 #include <compat/linux/common/linux_ioctl.h> 64 #include <compat/linux/common/linux_hdio.h> 65 #include <compat/linux/common/linux_exec.h> 66 #include <compat/linux/common/linux_machdep.h> 67 #include <compat/linux/linux_syscallargs.h> 68 69 #include <arm/locore.h> 70 71 void 72 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) 73 { 74 75 setregs(l, epp, stack); 76 } 77 78 void 79 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 80 { 81 struct lwp * const l = curlwp; 82 struct proc * const p = l->l_proc; 83 struct trapframe * const tf = lwp_trapframe(l); 84 struct linux_sigframe *fp, frame; 85 int onstack, error; 86 const int sig = ksi->ksi_signo; 87 sig_t catcher = SIGACTION(p, sig).sa_handler; 88 89 90 /* 91 * The Linux version of this code is in 92 * linux/arch/arm/kernel/signal.c. 93 */ 94 95 /* Do we need to jump onto the signal stack? */ 96 onstack = 97 (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 98 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 99 100 /* Allocate space for the signal handler context. */ 101 if (onstack) 102 fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp + 103 l->l_sigstk.ss_size); 104 else 105 fp = (struct linux_sigframe *)tf->tf_usr_sp; 106 fp--; 107 108 /* Build stack frame for signal trampoline. */ 109 110 memset(&frame, 0, sizeof(frame)); 111 112 /* Save register context. */ 113 frame.sf_sc.sc_r0 = tf->tf_r0; 114 frame.sf_sc.sc_r1 = tf->tf_r1; 115 frame.sf_sc.sc_r2 = tf->tf_r2; 116 frame.sf_sc.sc_r3 = tf->tf_r3; 117 frame.sf_sc.sc_r4 = tf->tf_r4; 118 frame.sf_sc.sc_r5 = tf->tf_r5; 119 frame.sf_sc.sc_r6 = tf->tf_r6; 120 frame.sf_sc.sc_r7 = tf->tf_r7; 121 frame.sf_sc.sc_r8 = tf->tf_r8; 122 frame.sf_sc.sc_r9 = tf->tf_r9; 123 frame.sf_sc.sc_r10 = tf->tf_r10; 124 frame.sf_sc.sc_r11 = tf->tf_r11; 125 frame.sf_sc.sc_r12 = tf->tf_r12; 126 frame.sf_sc.sc_sp = tf->tf_usr_sp; 127 frame.sf_sc.sc_lr = tf->tf_usr_lr; 128 frame.sf_sc.sc_pc = tf->tf_pc; 129 frame.sf_sc.sc_cpsr = tf->tf_spsr; 130 131 /* Save signal stack. */ 132 /* Linux doesn't save the onstack flag in sigframe */ 133 134 /* Save signal mask. */ 135 native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask, 136 frame.sf_extramask, mask); 137 138 /* Other state (mostly faked) */ 139 /* 140 * trapno should indicate the trap that caused the signal: 141 * 6 -> undefined instruction 142 * 11 -> address exception 143 * 14 -> data/prefetch abort 144 */ 145 frame.sf_sc.sc_trapno = 0; 146 frame.sf_sc.sc_error_code = 0; 147 frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr; 148 sendsig_reset(l, sig); 149 150 mutex_exit(p->p_lock); 151 error = copyout(&frame, fp, sizeof(frame)); 152 mutex_enter(p->p_lock); 153 154 if (error != 0) { 155 /* 156 * Process has trashed its stack; give it an illegal 157 * instruction to halt it in its tracks. 158 */ 159 sigexit(l, SIGILL); 160 /* NOTREACHED */ 161 } 162 /* 163 * Build context to run handler in. 164 */ 165 tf->tf_r0 = native_to_linux_signo[sig]; 166 tf->tf_r1 = 0; /* XXX Should be a siginfo_t */ 167 tf->tf_r2 = 0; 168 tf->tf_r3 = (register_t)catcher; 169 tf->tf_usr_sp = (register_t)fp; 170 tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode; 171 172 /* Remember that we're now on the signal stack. */ 173 if (onstack) 174 l->l_sigstk.ss_flags |= SS_ONSTACK; 175 176 } 177 178 #if 0 179 /* 180 * System call to cleanup state after a signal 181 * has been taken. Reset signal mask and 182 * stack state from context left by sendsig (above). 183 * Return to previous pc and psl as specified by 184 * context left by sendsig. Check carefully to 185 * make sure that the user has not modified the 186 * psl to gain improper privileges or to cause 187 * a machine fault. 188 */ 189 int 190 linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval) 191 { 192 /* XXX XAX write me */ 193 return(ENOSYS); 194 } 195 #endif 196 197 int 198 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *v, 199 register_t *retval) 200 { 201 struct trapframe * const tf = lwp_trapframe(l); 202 struct proc * const p = l->l_proc; 203 struct linux_sigframe *sfp, frame; 204 sigset_t mask; 205 206 /* 207 * The trampoline code hands us the context. 208 * It is unsafe to keep track of it ourselves, in the event that a 209 * program jumps out of a signal handler. 210 */ 211 sfp = (struct linux_sigframe *)tf->tf_usr_sp; 212 if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0) 213 return (EFAULT); 214 215 /* 216 * Make sure the processor mode has not been tampered with and 217 * interrupts have not been disabled. 218 */ 219 if (!VALID_PSR(frame.sf_sc.sc_cpsr)) 220 return EINVAL; 221 222 /* Restore register context. */ 223 tf->tf_r0 = frame.sf_sc.sc_r0; 224 tf->tf_r1 = frame.sf_sc.sc_r1; 225 tf->tf_r2 = frame.sf_sc.sc_r2; 226 tf->tf_r3 = frame.sf_sc.sc_r3; 227 tf->tf_r4 = frame.sf_sc.sc_r4; 228 tf->tf_r5 = frame.sf_sc.sc_r5; 229 tf->tf_r6 = frame.sf_sc.sc_r6; 230 tf->tf_r7 = frame.sf_sc.sc_r7; 231 tf->tf_r8 = frame.sf_sc.sc_r8; 232 tf->tf_r9 = frame.sf_sc.sc_r9; 233 tf->tf_r10 = frame.sf_sc.sc_r10; 234 tf->tf_r11 = frame.sf_sc.sc_r11; 235 tf->tf_r12 = frame.sf_sc.sc_r12; 236 tf->tf_usr_sp = frame.sf_sc.sc_sp; 237 tf->tf_usr_lr = frame.sf_sc.sc_lr; 238 tf->tf_pc = frame.sf_sc.sc_pc; 239 tf->tf_spsr = frame.sf_sc.sc_cpsr; 240 241 mutex_enter(p->p_lock); 242 243 /* Restore signal stack. */ 244 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 245 246 /* Restore signal mask. */ 247 linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask, 248 frame.sf_extramask); 249 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 250 251 mutex_exit(p->p_lock); 252 253 return (EJUSTRETURN); 254 } 255 256 /* 257 * major device numbers remapping 258 */ 259 dev_t 260 linux_fakedev(dev_t dev, int raw) 261 { 262 /* XXX write me */ 263 return dev; 264 } 265 266 /* 267 * We come here in a last attempt to satisfy a Linux ioctl() call 268 */ 269 int 270 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 271 { 272 /* { 273 syscallarg(int) fd; 274 syscallarg(u_long) com; 275 syscallarg(void *) data; 276 } */ 277 struct sys_ioctl_args bia; 278 u_long com; 279 280 memset(&bia, 0, sizeof(bia)); 281 SCARG(&bia, fd) = SCARG(uap, fd); 282 SCARG(&bia, data) = SCARG(uap, data); 283 com = SCARG(uap, com); 284 285 switch (com) { 286 default: 287 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 288 return EINVAL; 289 } 290 SCARG(&bia, com) = com; 291 292 return sys_ioctl(l, &bia, retval); 293 } 294 295 int 296 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 297 { 298 return 0; 299 } 300
Indexes created Sun Oct 25 00:26:45 UTC 2026