2 * Copyright (c) 2014, 2015 The FreeBSD Foundation.
3 * Copyright (c) 2014, 2017 Andrew Turner.
4 * Copyright (c) 2018 Olivier Houchard
7 * This software was developed by Andrew Turner under
8 * sponsorship from the FreeBSD Foundation.
10 * Portions of this software were developed by Konstantin Belousov
11 * under sponsorship from the FreeBSD Foundation.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #define __ELF_WORD_SIZE 32
40 #include <sys/param.h>
41 #include <sys/kernel.h>
42 #include <sys/systm.h>
44 #include <sys/imgact.h>
45 #include <sys/linker.h>
47 #include <sys/sysent.h>
48 #include <sys/imgact_elf.h>
49 #include <sys/syscall.h>
50 #include <sys/signalvar.h>
51 #include <sys/vnode.h>
53 #include <machine/elf.h>
55 #include <compat/freebsd32/freebsd32_util.h>
57 #define FREEBSD32_MINUSER 0x00001000
58 #define FREEBSD32_MAXUSER ((1ul << 32) - PAGE_SIZE)
59 #define FREEBSD32_SHAREDPAGE (FREEBSD32_MAXUSER - PAGE_SIZE)
60 #define FREEBSD32_USRSTACK FREEBSD32_SHAREDPAGE
62 extern const char *freebsd32_syscallnames[];
64 extern char aarch32_sigcode[];
65 extern int sz_aarch32_sigcode;
67 static int freebsd32_fetch_syscall_args(struct thread *td);
68 static void freebsd32_setregs(struct thread *td, struct image_params *imgp,
70 static void freebsd32_set_syscall_retval(struct thread *, int);
72 static boolean_t elf32_arm_abi_supported(struct image_params *);
74 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
76 static struct sysentvec elf32_freebsd_sysvec = {
77 .sv_size = SYS_MAXSYSCALL,
78 .sv_table = freebsd32_sysent,
82 .sv_fixup = elf32_freebsd_fixup,
83 .sv_sendsig = freebsd32_sendsig,
84 .sv_sigcode = aarch32_sigcode,
85 .sv_szsigcode = &sz_aarch32_sigcode,
86 .sv_name = "FreeBSD ELF32",
87 .sv_coredump = elf32_coredump,
88 .sv_imgact_try = NULL,
89 .sv_minsigstksz = MINSIGSTKSZ,
90 .sv_minuser = FREEBSD32_MINUSER,
91 .sv_maxuser = FREEBSD32_MAXUSER,
92 .sv_usrstack = FREEBSD32_USRSTACK,
93 .sv_psstrings = FREEBSD32_PS_STRINGS,
94 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
95 .sv_copyout_strings = freebsd32_copyout_strings,
96 .sv_setregs = freebsd32_setregs,
97 .sv_fixlimit = NULL, // XXX
99 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_TIMEKEEP,
100 .sv_set_syscall_retval = freebsd32_set_syscall_retval,
101 .sv_fetch_syscall_args = freebsd32_fetch_syscall_args,
102 .sv_syscallnames = freebsd32_syscallnames,
103 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
104 .sv_shared_page_len = PAGE_SIZE,
105 .sv_schedtail = NULL,
106 .sv_thread_detach = NULL,
109 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
111 static Elf32_Brandinfo freebsd32_brand_info = {
112 .brand = ELFOSABI_FREEBSD,
114 .compat_3_brand = "FreeBSD",
116 .interp_path = "/libexec/ld-elf.so.1",
117 .sysvec = &elf32_freebsd_sysvec,
118 .interp_newpath = "/libexec/ld-elf32.so.1",
119 .brand_note = &elf32_freebsd_brandnote,
120 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
121 .header_supported= elf32_arm_abi_supported,
124 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
125 (sysinit_cfunc_t)elf32_insert_brand_entry, &freebsd32_brand_info);
128 elf32_arm_abi_supported(struct image_params *imgp)
130 const Elf32_Ehdr *hdr;
132 /* Check if we support AArch32 */
133 if (ID_AA64PFR0_EL0(READ_SPECIALREG(id_aa64pfr0_el1)) !=
134 ID_AA64PFR0_EL0_64_32)
137 #define EF_ARM_EABI_VERSION(x) (((x) & EF_ARM_EABIMASK) >> 24)
138 #define EF_ARM_EABI_FREEBSD_MIN 4
139 hdr = (const Elf32_Ehdr *)imgp->image_header;
140 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
142 uprintf("Attempting to execute non EABI binary "
144 EF_ARM_EABI_VERSION(hdr->e_flags),
153 freebsd32_fetch_syscall_args(struct thread *td)
157 struct syscall_args *sa;
159 unsigned int args[4];
163 ap = td->td_frame->tf_x;
166 /* r7 is the syscall id */
167 sa->code = td->td_frame->tf_x[7];
169 if (sa->code == SYS_syscall) {
172 } else if (sa->code == SYS___syscall) {
178 if (sa->code >= p->p_sysent->sv_size)
179 sa->callp = &p->p_sysent->sv_table[0];
181 sa->callp = &p->p_sysent->sv_table[sa->code];
183 sa->narg = sa->callp->sy_narg;
184 for (i = 0; i < nap; i++)
186 if (sa->narg > nap) {
187 if ((sa->narg - nap) > nitems(args))
188 panic("Too many system call arguiments");
189 error = copyin((void *)td->td_frame->tf_x[13], args,
190 (sa->narg - nap) * sizeof(int));
191 for (i = 0; i < (sa->narg - nap); i++)
192 sa->args[i + nap] = args[i];
195 td->td_retval[0] = 0;
196 td->td_retval[1] = 0;
202 freebsd32_set_syscall_retval(struct thread *td, int error)
204 struct trapframe *frame;
206 frame = td->td_frame;
209 frame->tf_x[0] = td->td_retval[0];
210 frame->tf_x[1] = td->td_retval[1];
211 frame->tf_spsr &= ~PSR_C;
215 * Reconstruct the pc to point at the swi.
217 if ((frame->tf_spsr & PSR_T) != 0)
218 frame->tf_elr -= 2; //THUMB_INSN_SIZE;
220 frame->tf_elr -= 4; //INSN_SIZE;
226 frame->tf_x[0] = error;
227 frame->tf_spsr |= PSR_C;
233 freebsd32_setregs(struct thread *td, struct image_params *imgp,
236 struct trapframe *tf = td->td_frame;
238 memset(tf, 0, sizeof(struct trapframe));
241 * We need to set x0 for init as it doesn't call
242 * cpu_set_syscall_retval to copy the value. We also
243 * need to set td_retval for the cases where we do.
246 /* SP_usr is mapped to x13 */
247 tf->tf_x[13] = stack;
248 /* LR_usr is mapped to x14 */
249 tf->tf_x[14] = imgp->entry_addr;
250 tf->tf_elr = imgp->entry_addr;
251 tf->tf_spsr = PSR_M_32;
255 elf32_dump_thread(struct thread *td, void *dst, size_t *off)