1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1994-1996 S��ren Schmidt
5 * Copyright (c) 2018 Turing Robotic Industries Inc.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 */
28
29#define	__ELF_WORD_SIZE	64
30
31#include <sys/param.h>
32#include <sys/elf.h>
33#include <sys/exec.h>
34#include <sys/imgact.h>
35#include <sys/imgact_elf.h>
36#include <sys/kernel.h>
37#include <sys/ktr.h>
38#include <sys/lock.h>
39#include <sys/module.h>
40#include <sys/mutex.h>
41#include <sys/proc.h>
42#include <sys/stddef.h>
43#include <sys/syscallsubr.h>
44#include <sys/sysctl.h>
45#include <sys/sysent.h>
46
47#include <vm/vm.h>
48#include <vm/vm_param.h>
49
50#include <arm64/linux/linux.h>
51#include <arm64/linux/linux_proto.h>
52#include <compat/linux/linux_elf.h>
53#include <compat/linux/linux_emul.h>
54#include <compat/linux/linux_fork.h>
55#include <compat/linux/linux_ioctl.h>
56#include <compat/linux/linux_mib.h>
57#include <compat/linux/linux_misc.h>
58#include <compat/linux/linux_signal.h>
59#include <compat/linux/linux_util.h>
60#include <compat/linux/linux_vdso.h>
61
62#include <arm64/linux/linux_sigframe.h>
63
64#include <machine/md_var.h>
65#include <machine/pcb.h>
66#ifdef VFP
67#include <machine/vfp.h>
68#endif
69
70MODULE_VERSION(linux64elf, 1);
71
72#define	LINUX_VDSOPAGE_SIZE	PAGE_SIZE * 2
73#define	LINUX_VDSOPAGE		(VM_MAXUSER_ADDRESS - \
74				    LINUX_VDSOPAGE_SIZE)
75#define	LINUX_SHAREDPAGE	(LINUX_VDSOPAGE - PAGE_SIZE)
76				/*
77				 * PAGE_SIZE - the size
78				 * of the native SHAREDPAGE
79				 */
80#define	LINUX_USRSTACK		LINUX_SHAREDPAGE
81#define	LINUX_PS_STRINGS	(LINUX_USRSTACK - \
82				    sizeof(struct ps_strings))
83
84static int linux_szsigcode;
85static vm_object_t linux_vdso_obj;
86static char *linux_vdso_mapping;
87extern char _binary_linux_vdso_so_o_start;
88extern char _binary_linux_vdso_so_o_end;
89static vm_offset_t linux_vdso_base;
90
91extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
92extern const char *linux_syscallnames[];
93
94SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
95
96static void	linux_vdso_install(const void *param);
97static void	linux_vdso_deinstall(const void *param);
98static void	linux_vdso_reloc(char *mapping, Elf_Addr offset);
99static void	linux_set_syscall_retval(struct thread *td, int error);
100static int	linux_fetch_syscall_args(struct thread *td);
101static void	linux_exec_setregs(struct thread *td, struct image_params *imgp,
102		    uintptr_t stack);
103static void	linux_exec_sysvec_init(void *param);
104static int	linux_on_exec_vmspace(struct proc *p,
105		    struct image_params *imgp);
106
107LINUX_VDSO_SYM_CHAR(linux_platform);
108LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
109LINUX_VDSO_SYM_INTPTR(__user_rt_sigreturn);
110
111static int
112linux_fetch_syscall_args(struct thread *td)
113{
114	struct proc *p;
115	struct syscall_args *sa;
116	register_t *ap;
117
118	p = td->td_proc;
119	ap = td->td_frame->tf_x;
120	sa = &td->td_sa;
121
122	sa->code = td->td_frame->tf_x[8];
123	sa->original_code = sa->code;
124
125	if (sa->code >= p->p_sysent->sv_size)
126		sa->callp = &nosys_sysent;
127	else
128		sa->callp = &p->p_sysent->sv_table[sa->code];
129
130	if (sa->callp->sy_narg > nitems(sa->args))
131		panic("ARM64TODO: Could we have more than %zu args?",
132		    nitems(sa->args));
133	memcpy(sa->args, ap, nitems(sa->args) * sizeof(register_t));
134
135	td->td_retval[0] = 0;
136	return (0);
137}
138
139static void
140linux_set_syscall_retval(struct thread *td, int error)
141{
142
143	td->td_retval[1] = td->td_frame->tf_x[1];
144	cpu_set_syscall_retval(td, error);
145
146	if (__predict_false(error != 0)) {
147		if (error != ERESTART && error != EJUSTRETURN)
148			td->td_frame->tf_x[0] = bsd_to_linux_errno(error);
149	}
150}
151
152void
153linux64_arch_copyout_auxargs(struct image_params *imgp, Elf_Auxinfo **pos)
154{
155
156	AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
157	AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, *imgp->sysent->sv_hwcap);
158	AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, *imgp->sysent->sv_hwcap2);
159	AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
160}
161
162/*
163 * Reset registers to default values on exec.
164 */
165static void
166linux_exec_setregs(struct thread *td, struct image_params *imgp,
167    uintptr_t stack)
168{
169	struct trapframe *regs = td->td_frame;
170	struct pcb *pcb = td->td_pcb;
171
172	memset(regs, 0, sizeof(*regs));
173	regs->tf_sp = stack;
174	regs->tf_elr = imgp->entry_addr;
175	pcb->pcb_tpidr_el0 = 0;
176	pcb->pcb_tpidrro_el0 = 0;
177	WRITE_SPECIALREG(tpidrro_el0, 0);
178	WRITE_SPECIALREG(tpidr_el0, 0);
179
180#ifdef VFP
181	vfp_reset_state(td, pcb);
182#endif
183
184	/*
185	 * Clear debug register state. It is not applicable to the new process.
186	 */
187	bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs));
188}
189
190static bool
191linux_parse_sigreturn_ctx(struct thread *td, struct l_sigcontext *sc)
192{
193	struct l_fpsimd_context *fpsimd;
194	struct _l_aarch64_ctx *ctx;
195	int offset;
196
197	offset = 0;
198	while (1) {
199		/* The offset must be 16 byte aligned */
200		if ((offset & 15) != 0)
201			return (false);
202
203		/* Check for buffer overflow of the ctx */
204		if ((offset + sizeof(*ctx)) >
205		    sizeof(sc->__reserved))
206			return (false);
207
208		ctx = (struct _l_aarch64_ctx *)&sc->__reserved[offset];
209
210		/* Check for buffer overflow of the data */
211		if ((offset + ctx->size) > sizeof(sc->__reserved))
212			return (false);
213
214		switch(ctx->magic) {
215		case 0:
216			if (ctx->size != 0)
217				return (false);
218			return (true);
219		case L_ESR_MAGIC:
220			/* Ignore */
221			break;
222#ifdef VFP
223		case L_FPSIMD_MAGIC:
224			fpsimd = (struct l_fpsimd_context *)ctx;
225
226			/*
227			 * Discard any vfp state for the current thread, we
228			 * are about to override it.
229			 */
230			critical_enter();
231			vfp_discard(td);
232			critical_exit();
233
234			td->td_pcb->pcb_fpustate.vfp_fpcr = fpsimd->fpcr;
235			td->td_pcb->pcb_fpustate.vfp_fpsr = fpsimd->fpsr;
236			memcpy(td->td_pcb->pcb_fpustate.vfp_regs,
237			    fpsimd->vregs, sizeof(fpsimd->vregs));
238
239			break;
240#endif
241		default:
242			return (false);
243		}
244
245		offset += ctx->size;
246	}
247
248}
249
250int
251linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
252{
253	struct l_rt_sigframe *sf;
254	struct l_sigframe *frame;
255	struct trapframe *tf;
256	sigset_t bmask;
257	int error;
258
259	sf = malloc(sizeof(*sf), M_LINUX, M_WAITOK | M_ZERO);
260
261	tf = td->td_frame;
262	frame = (struct l_sigframe *)tf->tf_sp;
263	error = copyin((void *)&frame->sf, sf, sizeof(*sf));
264	if (error != 0) {
265		free(sf, M_LINUX);
266		return (error);
267	}
268
269	memcpy(tf->tf_x, sf->sf_uc.uc_sc.regs, sizeof(tf->tf_x));
270	tf->tf_lr = sf->sf_uc.uc_sc.regs[30];
271	tf->tf_sp = sf->sf_uc.uc_sc.sp;
272	tf->tf_elr = sf->sf_uc.uc_sc.pc;
273
274	if ((sf->sf_uc.uc_sc.pstate & PSR_M_MASK) != PSR_M_EL0t ||
275	    (sf->sf_uc.uc_sc.pstate & PSR_AARCH32) != 0 ||
276	    (sf->sf_uc.uc_sc.pstate & PSR_DAIF) !=
277	    (td->td_frame->tf_spsr & PSR_DAIF))
278		goto einval;
279	tf->tf_spsr = sf->sf_uc.uc_sc.pstate;
280
281	if (!linux_parse_sigreturn_ctx(td, &sf->sf_uc.uc_sc))
282		goto einval;
283
284	/* Restore signal mask. */
285	linux_to_bsd_sigset(&sf->sf_uc.uc_sigmask, &bmask);
286	kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
287	free(sf, M_LINUX);
288
289	return (EJUSTRETURN);
290einval:
291	free(sf, M_LINUX);
292	return (EINVAL);
293}
294
295static void
296linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
297{
298	struct thread *td;
299	struct proc *p;
300	struct trapframe *tf;
301	struct l_sigframe *fp, *frame;
302	struct l_fpsimd_context *fpsimd;
303	struct l_esr_context *esr;
304	l_stack_t uc_stack;
305	ucontext_t uc;
306	uint8_t *scr;
307	struct sigacts *psp;
308	int onstack, sig, issiginfo;
309
310	td = curthread;
311	p = td->td_proc;
312	PROC_LOCK_ASSERT(p, MA_OWNED);
313
314	sig = ksi->ksi_signo;
315	psp = p->p_sigacts;
316	mtx_assert(&psp->ps_mtx, MA_OWNED);
317
318	tf = td->td_frame;
319	onstack = sigonstack(tf->tf_sp);
320	issiginfo = SIGISMEMBER(psp->ps_siginfo, sig);
321
322	CTR4(KTR_SIG, "sendsig: td=%p (%s) catcher=%p sig=%d", td, p->p_comm,
323	    catcher, sig);
324
325	/* Allocate and validate space for the signal handler context. */
326	if ((td->td_pflags & TDP_ALTSTACK) != 0 && !onstack &&
327	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
328		fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
329		    td->td_sigstk.ss_size);
330#if defined(COMPAT_43)
331		td->td_sigstk.ss_flags |= SS_ONSTACK;
332#endif
333	} else {
334		fp = (struct l_sigframe *)td->td_frame->tf_sp;
335	}
336
337	/* Make room, keeping the stack aligned */
338	fp--;
339	fp = (struct l_sigframe *)STACKALIGN(fp);
340
341	get_mcontext(td, &uc.uc_mcontext, 0);
342	uc.uc_sigmask = *mask;
343
344	uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
345	uc_stack.ss_size = td->td_sigstk.ss_size;
346	uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) != 0 ?
347	    (onstack ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
348	mtx_unlock(&psp->ps_mtx);
349	PROC_UNLOCK(td->td_proc);
350
351	/* Fill in the frame to copy out */
352	frame = malloc(sizeof(*frame), M_LINUX, M_WAITOK | M_ZERO);
353
354	memcpy(&frame->sf.sf_uc.uc_sc.regs, tf->tf_x, sizeof(tf->tf_x));
355	frame->sf.sf_uc.uc_sc.regs[30] = tf->tf_lr;
356	frame->sf.sf_uc.uc_sc.sp = tf->tf_sp;
357	frame->sf.sf_uc.uc_sc.pc = tf->tf_elr;
358	frame->sf.sf_uc.uc_sc.pstate = tf->tf_spsr;
359	frame->sf.sf_uc.uc_sc.fault_address = (register_t)ksi->ksi_addr;
360
361	/* Stack frame for unwinding */
362	frame->fp = tf->tf_x[29];
363	frame->lr = tf->tf_elr;
364
365	/* Translate the signal. */
366	sig = bsd_to_linux_signal(sig);
367	siginfo_to_lsiginfo(&ksi->ksi_info, &frame->sf.sf_si, sig);
368	bsd_to_linux_sigset(mask, &frame->sf.sf_uc.uc_sigmask);
369
370	/*
371	 * Prepare fpsimd & esr. Does not check sizes, as
372	 * __reserved is big enougth.
373	 */
374	scr = (uint8_t *)&frame->sf.sf_uc.uc_sc.__reserved;
375#ifdef VFP
376	fpsimd = (struct l_fpsimd_context *) scr;
377	fpsimd->head.magic = L_FPSIMD_MAGIC;
378	fpsimd->head.size = sizeof(struct l_fpsimd_context);
379	fpsimd->fpsr = uc.uc_mcontext.mc_fpregs.fp_sr;
380	fpsimd->fpcr = uc.uc_mcontext.mc_fpregs.fp_cr;
381
382	memcpy(fpsimd->vregs, &uc.uc_mcontext.mc_fpregs.fp_q,
383	    sizeof(uc.uc_mcontext.mc_fpregs.fp_q));
384	scr += roundup(sizeof(struct l_fpsimd_context), 16);
385#endif
386	if (ksi->ksi_addr != 0) {
387		esr = (struct l_esr_context *) scr;
388		esr->head.magic = L_ESR_MAGIC;
389		esr->head.size = sizeof(struct l_esr_context);
390		esr->esr = tf->tf_esr;
391	}
392
393	memcpy(&frame->sf.sf_uc.uc_stack, &uc_stack, sizeof(uc_stack));
394
395	/* Copy the sigframe out to the user's stack. */
396	if (copyout(frame, fp, sizeof(*fp)) != 0) {
397		/* Process has trashed its stack. Kill it. */
398		free(frame, M_LINUX);
399		CTR2(KTR_SIG, "sendsig: sigexit td=%p fp=%p", td, fp);
400		PROC_LOCK(p);
401		sigexit(td, SIGILL);
402	}
403	free(frame, M_LINUX);
404
405	tf->tf_x[0]= sig;
406	if (issiginfo) {
407		tf->tf_x[1] = (register_t)&fp->sf.sf_si;
408		tf->tf_x[2] = (register_t)&fp->sf.sf_uc;
409	} else {
410		tf->tf_x[1] = 0;
411		tf->tf_x[2] = 0;
412	}
413	tf->tf_x[29] = (register_t)&fp->fp;
414	tf->tf_elr = (register_t)catcher;
415	tf->tf_sp = (register_t)fp;
416	tf->tf_lr = (register_t)__user_rt_sigreturn;
417
418	CTR3(KTR_SIG, "sendsig: return td=%p pc=%#x sp=%#x", td, tf->tf_elr,
419	    tf->tf_sp);
420
421	PROC_LOCK(p);
422	mtx_lock(&psp->ps_mtx);
423}
424
425struct sysentvec elf_linux_sysvec = {
426	.sv_size	= LINUX_SYS_MAXSYSCALL,
427	.sv_table	= linux_sysent,
428	.sv_fixup	= __elfN(freebsd_fixup),
429	.sv_sendsig	= linux_rt_sendsig,
430	.sv_sigcode	= &_binary_linux_vdso_so_o_start,
431	.sv_szsigcode	= &linux_szsigcode,
432	.sv_name	= "Linux ELF64",
433	.sv_coredump	= elf64_coredump,
434	.sv_elf_core_osabi = ELFOSABI_NONE,
435	.sv_elf_core_abi_vendor = LINUX_ABI_VENDOR,
436	.sv_elf_core_prepare_notes = linux64_prepare_notes,
437	.sv_minsigstksz	= LINUX_MINSIGSTKSZ,
438	.sv_minuser	= VM_MIN_ADDRESS,
439	.sv_maxuser	= VM_MAXUSER_ADDRESS,
440	.sv_usrstack	= LINUX_USRSTACK,
441	.sv_psstrings	= LINUX_PS_STRINGS,
442	.sv_psstringssz	= sizeof(struct ps_strings),
443	.sv_stackprot	= VM_PROT_READ | VM_PROT_WRITE,
444	.sv_copyout_auxargs = __linuxN(copyout_auxargs),
445	.sv_copyout_strings = __linuxN(copyout_strings),
446	.sv_setregs	= linux_exec_setregs,
447	.sv_fixlimit	= NULL,
448	.sv_maxssiz	= NULL,
449	.sv_flags	= SV_ABI_LINUX | SV_LP64 | SV_SHP | SV_SIG_DISCIGN |
450	    SV_SIG_WAITNDQ | SV_TIMEKEEP,
451	.sv_set_syscall_retval = linux_set_syscall_retval,
452	.sv_fetch_syscall_args = linux_fetch_syscall_args,
453	.sv_syscallnames = linux_syscallnames,
454	.sv_shared_page_base = LINUX_SHAREDPAGE,
455	.sv_shared_page_len = PAGE_SIZE,
456	.sv_schedtail	= linux_schedtail,
457	.sv_thread_detach = linux_thread_detach,
458	.sv_trap	= NULL,
459	.sv_hwcap	= &linux_elf_hwcap,
460	.sv_hwcap2	= &linux_elf_hwcap2,
461	.sv_onexec	= linux_on_exec_vmspace,
462	.sv_onexit	= linux_on_exit,
463	.sv_ontdexit	= linux_thread_dtor,
464	.sv_setid_allowed = &linux_setid_allowed_query,
465};
466
467static int
468linux_on_exec_vmspace(struct proc *p, struct image_params *imgp)
469{
470	int error;
471
472	error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base,
473	    LINUX_VDSOPAGE_SIZE, imgp);
474	if (error == 0)
475		error = linux_on_exec(p, imgp);
476	return (error);
477}
478
479/*
480 * linux_vdso_install() and linux_exec_sysvec_init() must be called
481 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY).
482 */
483static void
484linux_exec_sysvec_init(void *param)
485{
486	l_uintptr_t *ktimekeep_base;
487	struct sysentvec *sv;
488	ptrdiff_t tkoff;
489
490	sv = param;
491	/* Fill timekeep_base */
492	exec_sysvec_init(sv);
493
494	tkoff = kern_timekeep_base - linux_vdso_base;
495	ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
496	*ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset;
497}
498SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY,
499    linux_exec_sysvec_init, &elf_linux_sysvec);
500
501static void
502linux_vdso_install(const void *param)
503{
504	char *vdso_start = &_binary_linux_vdso_so_o_start;
505	char *vdso_end = &_binary_linux_vdso_so_o_end;
506
507	linux_szsigcode = vdso_end - vdso_start;
508	MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE);
509
510	linux_vdso_base = LINUX_VDSOPAGE;
511
512	__elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base);
513
514	linux_vdso_obj = __elfN(linux_shared_page_init)
515	    (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
516	bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode);
517
518	linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base);
519}
520SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST,
521    linux_vdso_install, NULL);
522
523static void
524linux_vdso_deinstall(const void *param)
525{
526
527	__elfN(linux_shared_page_fini)(linux_vdso_obj,
528	    linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
529}
530SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
531    linux_vdso_deinstall, NULL);
532
533static void
534linux_vdso_reloc(char *mapping, Elf_Addr offset)
535{
536	Elf_Size rtype, symidx;
537	const Elf_Rela *rela;
538	const Elf_Shdr *shdr;
539	const Elf_Ehdr *ehdr;
540	Elf_Addr *where;
541	Elf_Addr addr, addend;
542	int i, relacnt;
543
544	MPASS(offset != 0);
545
546	relacnt = 0;
547	ehdr = (const Elf_Ehdr *)mapping;
548	shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff);
549	for (i = 0; i < ehdr->e_shnum; i++)
550	{
551		switch (shdr[i].sh_type) {
552		case SHT_REL:
553			printf("Linux Aarch64 vDSO: unexpected Rel section\n");
554			break;
555		case SHT_RELA:
556			rela = (const Elf_Rela *)(mapping + shdr[i].sh_offset);
557			relacnt = shdr[i].sh_size / sizeof(*rela);
558		}
559	}
560
561	for (i = 0; i < relacnt; i++, rela++) {
562		where = (Elf_Addr *)(mapping + rela->r_offset);
563		addend = rela->r_addend;
564		rtype = ELF_R_TYPE(rela->r_info);
565		symidx = ELF_R_SYM(rela->r_info);
566
567		switch (rtype) {
568		case R_AARCH64_NONE:	/* none */
569			break;
570
571		case R_AARCH64_RELATIVE:	/* B + A */
572			addr = (Elf_Addr)(mapping + addend);
573			if (*where != addr)
574				*where = addr;
575			break;
576		default:
577			printf("Linux Aarch64 vDSO: unexpected relocation type %ld, "
578			    "symbol index %ld\n", rtype, symidx);
579		}
580	}
581}
582
583static Elf_Brandnote linux64_brandnote = {
584	.hdr.n_namesz	= sizeof(GNU_ABI_VENDOR),
585	.hdr.n_descsz	= 16,
586	.hdr.n_type	= 1,
587	.vendor		= GNU_ABI_VENDOR,
588	.flags		= BN_TRANSLATE_OSREL,
589	.trans_osrel	= linux_trans_osrel
590};
591
592static Elf64_Brandinfo linux_glibc2brand = {
593	.brand		= ELFOSABI_LINUX,
594	.machine	= EM_AARCH64,
595	.compat_3_brand	= "Linux",
596	.interp_path	= "/lib64/ld-linux-x86-64.so.2",
597	.sysvec		= &elf_linux_sysvec,
598	.interp_newpath	= NULL,
599	.brand_note	= &linux64_brandnote,
600	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
601};
602
603Elf64_Brandinfo *linux_brandlist[] = {
604	&linux_glibc2brand,
605	NULL
606};
607
608static int
609linux64_elf_modevent(module_t mod, int type, void *data)
610{
611	Elf64_Brandinfo **brandinfo;
612	struct linux_ioctl_handler**lihp;
613	int error;
614
615	error = 0;
616	switch(type) {
617	case MOD_LOAD:
618		for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
619		    ++brandinfo)
620			if (elf64_insert_brand_entry(*brandinfo) < 0)
621				error = EINVAL;
622		if (error == 0) {
623			SET_FOREACH(lihp, linux_ioctl_handler_set)
624				linux_ioctl_register_handler(*lihp);
625			stclohz = (stathz ? stathz : hz);
626			if (bootverbose)
627				printf("Linux arm64 ELF exec handler installed\n");
628		}
629		break;
630	case MOD_UNLOAD:
631		for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
632		    ++brandinfo)
633			if (elf64_brand_inuse(*brandinfo))
634				error = EBUSY;
635		if (error == 0) {
636			for (brandinfo = &linux_brandlist[0];
637			    *brandinfo != NULL; ++brandinfo)
638				if (elf64_remove_brand_entry(*brandinfo) < 0)
639					error = EINVAL;
640		}
641		if (error == 0) {
642			SET_FOREACH(lihp, linux_ioctl_handler_set)
643				linux_ioctl_unregister_handler(*lihp);
644			if (bootverbose)
645				printf("Linux arm64 ELF exec handler removed\n");
646		} else
647			printf("Could not deinstall Linux arm64 ELF interpreter entry\n");
648		break;
649	default:
650		return (EOPNOTSUPP);
651	}
652	return (error);
653}
654
655static moduledata_t linux64_elf_mod = {
656	"linux64elf",
657	linux64_elf_modevent,
658	0
659};
660
661DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
662MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
663FEATURE(linux64, "AArch64 Linux 64bit support");
664