2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1994-1996 Søren Schmidt
5 * Copyright (c) 2018 Turing Robotic Industries Inc.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/cdefs.h>
37 #include <sys/imgact.h>
38 #include <sys/imgact_elf.h>
39 #include <sys/kernel.h>
41 #include <sys/module.h>
42 #include <sys/mutex.h>
44 #include <sys/signalvar.h>
45 #include <sys/sysctl.h>
46 #include <sys/sysent.h>
48 #include <vm/vm_param.h>
50 #include <arm64/linux/linux.h>
51 #include <arm64/linux/linux_proto.h>
52 #include <compat/linux/linux_dtrace.h>
53 #include <compat/linux/linux_emul.h>
54 #include <compat/linux/linux_ioctl.h>
55 #include <compat/linux/linux_mib.h>
56 #include <compat/linux/linux_misc.h>
57 #include <compat/linux/linux_vdso.h>
59 MODULE_VERSION(linux64elf, 1);
61 const char *linux_kplatform;
62 static int linux_szsigcode;
63 static vm_object_t linux_shared_page_obj;
64 static char *linux_shared_page_mapping;
65 extern char _binary_linux_locore_o_start;
66 extern char _binary_linux_locore_o_end;
68 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
70 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
72 static register_t *linux_copyout_strings(struct image_params *imgp);
73 static int linux_elf_fixup(register_t **stack_base,
74 struct image_params *iparams);
75 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
76 static void linux_vdso_install(const void *param);
77 static void linux_vdso_deinstall(const void *param);
78 static void linux_set_syscall_retval(struct thread *td, int error);
79 static int linux_fetch_syscall_args(struct thread *td);
80 static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
82 static int linux_vsyscall(struct thread *td);
85 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
88 LIN_SDT_PROBE_DEFINE2(sysvec, linux_translate_traps, todo, "int", "int");
89 LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo);
90 LIN_SDT_PROBE_DEFINE0(sysvec, linux_elf_fixup, todo);
91 LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sigreturn, todo);
92 LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sendsig, todo);
93 LIN_SDT_PROBE_DEFINE0(sysvec, linux_vsyscall, todo);
94 LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_install, todo);
95 LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_deinstall, todo);
97 /* LINUXTODO: do we have traps to translate? */
99 linux_translate_traps(int signal, int trap_code)
102 LIN_SDT_PROBE2(sysvec, linux_translate_traps, todo, signal, trap_code);
106 LINUX_VDSO_SYM_CHAR(linux_platform);
109 linux_fetch_syscall_args(struct thread *td)
112 struct syscall_args *sa;
116 ap = td->td_frame->tf_x;
119 sa->code = td->td_frame->tf_x[8];
120 /* LINUXTODO: generic syscall? */
121 if (sa->code >= p->p_sysent->sv_size)
122 sa->callp = &p->p_sysent->sv_table[0];
124 sa->callp = &p->p_sysent->sv_table[sa->code];
126 sa->narg = sa->callp->sy_narg;
128 panic("ARM64TODO: Could we have more than 8 args?");
129 memcpy(sa->args, ap, 8 * sizeof(register_t));
131 td->td_retval[0] = 0;
136 linux_set_syscall_retval(struct thread *td, int error)
139 td->td_retval[1] = td->td_frame->tf_x[1];
140 cpu_set_syscall_retval(td, error);
144 linux_elf_fixup(register_t **stack_base, struct image_params *imgp)
147 Elf_Auxinfo *argarray, *pos;
148 Elf_Addr *auxbase, *base;
149 struct ps_strings *arginfo;
151 int error, issetugid;
153 LIN_SDT_PROBE0(sysvec, linux_elf_fixup, todo);
155 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
157 KASSERT(curthread->td_proc == imgp->proc,
158 ("unsafe linux_elf_fixup(), should be curproc"));
159 base = (Elf64_Addr *)*stack_base;
160 args = (Elf64_Auxargs *)imgp->auxargs;
161 /* Auxargs after argc, and NULL-terminated argv and envv lists. */
162 auxbase = base + 1 + imgp->args->argc + 1 + imgp->args->envc + 1;
163 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
166 issetugid = p->p_flag & P_SUGID ? 1 : 0;
167 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
168 imgp->proc->p_sysent->sv_shared_page_base);
169 #if 0 /* LINUXTODO: implement arm64 LINUX_AT_HWCAP */
170 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
172 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
173 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
174 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
175 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
176 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
177 AUXARGS_ENTRY(pos, AT_BASE, args->base);
178 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
179 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
180 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
181 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
182 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
183 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
184 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
185 #if 0 /* LINUXTODO: implement arm64 LINUX_AT_PLATFORM */
186 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
188 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
189 if (imgp->execpathp != 0)
190 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
191 if (args->execfd != -1)
192 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
193 AUXARGS_ENTRY(pos, AT_NULL, 0);
194 free(imgp->auxargs, M_TEMP);
195 imgp->auxargs = NULL;
196 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
198 error = copyout(argarray, auxbase, sizeof(*argarray) * LINUX_AT_COUNT);
199 free(argarray, M_TEMP);
207 * Copy strings out to the new process address space, constructing new arg
208 * and env vector tables. Return a pointer to the base so that it can be used
209 * as the initial stack pointer.
210 * LINUXTODO: deduplicate against other linuxulator archs
213 linux_copyout_strings(struct image_params *imgp)
216 char *stringp, *destp;
217 register_t *stack_base;
218 struct ps_strings *arginfo;
219 char canary[LINUX_AT_RANDOM_LEN];
224 /* Calculate string base and vector table pointers. */
225 if (imgp->execpath != NULL && imgp->auxargs != NULL)
226 execpath_len = strlen(imgp->execpath) + 1;
231 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
232 destp = (caddr_t)arginfo - SPARE_USRSPACE -
233 roundup(sizeof(canary), sizeof(char *)) -
234 roundup(execpath_len, sizeof(char *)) -
235 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
237 if (execpath_len != 0) {
238 imgp->execpathp = (uintptr_t)arginfo - execpath_len;
239 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
242 /* Prepare the canary for SSP. */
243 arc4rand(canary, sizeof(canary), 0);
244 imgp->canary = (uintptr_t)arginfo -
245 roundup(execpath_len, sizeof(char *)) -
246 roundup(sizeof(canary), sizeof(char *));
247 copyout(canary, (void *)imgp->canary, sizeof(canary));
249 vectp = (char **)destp;
252 * Allocate room on the stack for the ELF auxargs
253 * array. It has up to LINUX_AT_COUNT entries.
255 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf64_Auxinfo),
260 * Allocate room for argc and the argv[] and env vectors including the
261 * terminating NULL pointers.
263 vectp -= 1 + imgp->args->argc + 1 + imgp->args->envc + 1;
264 vectp = (char **)STACKALIGN(vectp);
266 /* vectp also becomes our initial stack base. */
267 stack_base = (register_t *)vectp;
269 stringp = imgp->args->begin_argv;
270 argc = imgp->args->argc;
271 envc = imgp->args->envc;
273 /* Copy out strings - arguments and environment. */
274 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
276 /* Fill in "ps_strings" struct for ps, w, etc. */
277 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
278 suword(&arginfo->ps_nargvstr, argc);
280 suword(vectp++, argc);
281 /* Fill in argument portion of vector table. */
282 for (; argc > 0; --argc) {
283 suword(vectp++, (long)(intptr_t)destp);
284 while (*stringp++ != 0)
289 /* A null vector table pointer separates the argp's from the envp's. */
292 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
293 suword(&arginfo->ps_nenvstr, envc);
295 /* Fill in environment portion of vector table. */
296 for (; envc > 0; --envc) {
297 suword(vectp++, (long)(intptr_t)destp);
298 while (*stringp++ != 0)
303 /* The end of the vector table is a null pointer. */
309 * Reset registers to default values on exec.
312 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
314 struct trapframe *regs = td->td_frame;
316 /* LINUXTODO: validate */
317 LIN_SDT_PROBE0(sysvec, linux_exec_setregs, todo);
319 memset(regs, 0, sizeof(*regs));
320 /* glibc start.S registers function pointer in x0 with atexit. */
322 #if 0 /* LINUXTODO: See if this is used. */
323 regs->tf_lr = imgp->entry_addr;
325 regs->tf_lr = 0xffffffffffffffff;
327 regs->tf_elr = imgp->entry_addr;
331 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
334 /* LINUXTODO: implement */
335 LIN_SDT_PROBE0(sysvec, linux_rt_sigreturn, todo);
340 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
343 /* LINUXTODO: implement */
344 LIN_SDT_PROBE0(sysvec, linux_rt_sendsig, todo);
348 linux_vsyscall(struct thread *td)
351 /* LINUXTODO: implement */
352 LIN_SDT_PROBE0(sysvec, linux_vsyscall, todo);
356 struct sysentvec elf_linux_sysvec = {
357 .sv_size = LINUX_SYS_MAXSYSCALL,
358 .sv_table = linux_sysent,
359 .sv_errsize = ELAST + 1,
360 .sv_errtbl = linux_errtbl,
361 .sv_transtrap = linux_translate_traps,
362 .sv_fixup = linux_elf_fixup,
363 .sv_sendsig = linux_rt_sendsig,
364 .sv_sigcode = &_binary_linux_locore_o_start,
365 .sv_szsigcode = &linux_szsigcode,
366 .sv_name = "Linux ELF64",
367 .sv_coredump = elf64_coredump,
368 .sv_imgact_try = linux_exec_imgact_try,
369 .sv_minsigstksz = LINUX_MINSIGSTKSZ,
370 .sv_minuser = VM_MIN_ADDRESS,
371 .sv_maxuser = VM_MAXUSER_ADDRESS,
372 .sv_usrstack = USRSTACK,
373 .sv_psstrings = PS_STRINGS, /* XXX */
374 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
375 .sv_copyout_strings = linux_copyout_strings,
376 .sv_setregs = linux_exec_setregs,
379 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
380 .sv_set_syscall_retval = linux_set_syscall_retval,
381 .sv_fetch_syscall_args = linux_fetch_syscall_args,
382 .sv_syscallnames = NULL,
383 .sv_shared_page_base = SHAREDPAGE,
384 .sv_shared_page_len = PAGE_SIZE,
385 .sv_schedtail = linux_schedtail,
386 .sv_thread_detach = linux_thread_detach,
387 .sv_trap = linux_vsyscall,
391 linux_vdso_install(const void *param)
394 linux_szsigcode = (&_binary_linux_locore_o_end -
395 &_binary_linux_locore_o_start);
397 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
398 panic("invalid Linux VDSO size\n");
400 __elfN(linux_vdso_fixup)(&elf_linux_sysvec);
402 linux_shared_page_obj = __elfN(linux_shared_page_init)
403 (&linux_shared_page_mapping);
405 __elfN(linux_vdso_reloc)(&elf_linux_sysvec);
407 memcpy(linux_shared_page_mapping, elf_linux_sysvec.sv_sigcode,
409 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
411 printf("LINUXTODO: %s: fix linux_kplatform\n", __func__);
413 linux_kplatform = linux_shared_page_mapping +
414 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
416 linux_kplatform = "arm64";
419 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
420 linux_vdso_install, NULL);
423 linux_vdso_deinstall(const void *param)
426 LIN_SDT_PROBE0(sysvec, linux_vdso_deinstall, todo);
427 __elfN(linux_shared_page_fini)(linux_shared_page_obj);
429 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
430 linux_vdso_deinstall, NULL);
432 static char GNU_ABI_VENDOR[] = "GNU";
433 static int GNU_ABI_LINUX = 0;
435 /* LINUXTODO: deduplicate */
437 linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
439 const Elf32_Word *desc;
442 p = (uintptr_t)(note + 1);
443 p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
445 desc = (const Elf32_Word *)p;
446 if (desc[0] != GNU_ABI_LINUX)
449 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
453 static Elf_Brandnote linux64_brandnote = {
454 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
457 .vendor = GNU_ABI_VENDOR,
458 .flags = BN_TRANSLATE_OSREL,
459 .trans_osrel = linux_trans_osrel
462 static Elf64_Brandinfo linux_glibc2brand = {
463 .brand = ELFOSABI_LINUX,
464 .machine = EM_AARCH64,
465 .compat_3_brand = "Linux",
466 .emul_path = "/compat/linux",
467 .interp_path = "/lib64/ld-linux-x86-64.so.2",
468 .sysvec = &elf_linux_sysvec,
469 .interp_newpath = NULL,
470 .brand_note = &linux64_brandnote,
471 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
474 Elf64_Brandinfo *linux_brandlist[] = {
480 linux64_elf_modevent(module_t mod, int type, void *data)
482 Elf64_Brandinfo **brandinfo;
483 struct linux_ioctl_handler**lihp;
489 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
491 if (elf64_insert_brand_entry(*brandinfo) < 0)
494 SET_FOREACH(lihp, linux_ioctl_handler_set)
495 linux_ioctl_register_handler(*lihp);
496 stclohz = (stathz ? stathz : hz);
498 printf("Linux arm64 ELF exec handler installed\n");
502 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
504 if (elf64_brand_inuse(*brandinfo))
507 for (brandinfo = &linux_brandlist[0];
508 *brandinfo != NULL; ++brandinfo)
509 if (elf64_remove_brand_entry(*brandinfo) < 0)
513 SET_FOREACH(lihp, linux_ioctl_handler_set)
514 linux_ioctl_unregister_handler(*lihp);
516 printf("Linux ELF exec handler removed\n");
518 printf("Could not deinstall ELF interpreter entry\n");
526 static moduledata_t linux64_elf_mod = {
528 linux64_elf_modevent,
532 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
533 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
534 FEATURE(linux64, "AArch64 Linux 64bit support");