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>
48 #include <sys/sysent.h>
49 #include <sys/imgact_elf.h>
50 #include <sys/syscall.h>
51 #include <sys/signalvar.h>
52 #include <sys/vnode.h>
54 #include <machine/elf.h>
55 #include <machine/pcb.h>
57 #include <machine/vfp.h>
60 #include <compat/freebsd32/freebsd32_util.h>
62 #define FREEBSD32_MINUSER 0x00001000
63 #define FREEBSD32_MAXUSER ((1ul << 32) - PAGE_SIZE)
64 #define FREEBSD32_SHAREDPAGE (FREEBSD32_MAXUSER - PAGE_SIZE)
65 #define FREEBSD32_USRSTACK FREEBSD32_SHAREDPAGE
67 extern const char *freebsd32_syscallnames[];
69 extern char aarch32_sigcode[];
70 extern int sz_aarch32_sigcode;
72 static int freebsd32_fetch_syscall_args(struct thread *td);
73 static void freebsd32_setregs(struct thread *td, struct image_params *imgp,
75 static void freebsd32_set_syscall_retval(struct thread *, int);
77 static bool elf32_arm_abi_supported(struct image_params *, int32_t *,
80 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
82 u_long __read_frequently elf32_hwcap;
83 u_long __read_frequently elf32_hwcap2;
85 static struct sysentvec elf32_freebsd_sysvec = {
86 .sv_size = SYS_MAXSYSCALL,
87 .sv_table = freebsd32_sysent,
88 .sv_fixup = elf32_freebsd_fixup,
89 .sv_sendsig = freebsd32_sendsig,
90 .sv_sigcode = aarch32_sigcode,
91 .sv_szsigcode = &sz_aarch32_sigcode,
92 .sv_name = "FreeBSD ELF32",
93 .sv_coredump = elf32_coredump,
94 .sv_elf_core_osabi = ELFOSABI_FREEBSD,
95 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
96 .sv_elf_core_prepare_notes = elf32_prepare_notes,
97 .sv_minsigstksz = MINSIGSTKSZ,
98 .sv_minuser = FREEBSD32_MINUSER,
99 .sv_maxuser = FREEBSD32_MAXUSER,
100 .sv_usrstack = FREEBSD32_USRSTACK,
101 .sv_psstrings = FREEBSD32_PS_STRINGS,
102 .sv_psstringssz = sizeof(struct freebsd32_ps_strings),
103 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
104 .sv_copyout_auxargs = elf32_freebsd_copyout_auxargs,
105 .sv_copyout_strings = freebsd32_copyout_strings,
106 .sv_setregs = freebsd32_setregs,
107 .sv_fixlimit = NULL, // XXX
109 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_TIMEKEEP |
111 .sv_set_syscall_retval = freebsd32_set_syscall_retval,
112 .sv_fetch_syscall_args = freebsd32_fetch_syscall_args,
113 .sv_syscallnames = freebsd32_syscallnames,
114 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
115 .sv_shared_page_len = PAGE_SIZE,
116 .sv_schedtail = NULL,
117 .sv_thread_detach = NULL,
119 .sv_hwcap = &elf32_hwcap,
120 .sv_hwcap2 = &elf32_hwcap2,
121 .sv_onexec_old = exec_onexec_old,
122 .sv_onexit = exit_onexit,
123 .sv_regset_begin = SET_BEGIN(__elfN(regset)),
124 .sv_regset_end = SET_LIMIT(__elfN(regset)),
126 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
128 static Elf32_Brandinfo freebsd32_brand_info = {
129 .brand = ELFOSABI_FREEBSD,
131 .compat_3_brand = "FreeBSD",
132 .interp_path = "/libexec/ld-elf.so.1",
133 .sysvec = &elf32_freebsd_sysvec,
134 .interp_newpath = "/libexec/ld-elf32.so.1",
135 .brand_note = &elf32_freebsd_brandnote,
136 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
137 .header_supported= elf32_arm_abi_supported,
140 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
141 (sysinit_cfunc_t)elf32_insert_brand_entry, &freebsd32_brand_info);
144 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
145 uint32_t *fctl0 __unused)
147 const Elf32_Ehdr *hdr;
149 /* Check if we support AArch32 */
150 if (ID_AA64PFR0_EL0_VAL(READ_SPECIALREG(id_aa64pfr0_el1)) !=
151 ID_AA64PFR0_EL0_64_32)
154 #define EF_ARM_EABI_FREEBSD_MIN EF_ARM_EABI_VER4
155 hdr = (const Elf32_Ehdr *)imgp->image_header;
156 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
158 uprintf("Attempting to execute non EABI binary "
160 EF_ARM_EABI_VERSION(hdr->e_flags),
169 freebsd32_fetch_syscall_args(struct thread *td)
173 struct syscall_args *sa;
174 int error, i, nap, narg;
175 unsigned int args[4];
179 ap = td->td_frame->tf_x;
182 /* r7 is the syscall id */
183 sa->code = td->td_frame->tf_x[7];
184 sa->original_code = sa->code;
186 if (sa->code == SYS_syscall) {
189 } else if (sa->code == SYS___syscall) {
195 if (sa->code >= p->p_sysent->sv_size)
196 sa->callp = &p->p_sysent->sv_table[0];
198 sa->callp = &p->p_sysent->sv_table[sa->code];
200 narg = sa->callp->sy_narg;
201 for (i = 0; i < nap; i++)
204 if (narg - nap > nitems(args))
205 panic("Too many system call arguiments");
206 error = copyin((void *)td->td_frame->tf_x[13], args,
207 (narg - nap) * sizeof(int));
210 for (i = 0; i < (narg - nap); i++)
211 sa->args[i + nap] = args[i];
214 td->td_retval[0] = 0;
215 td->td_retval[1] = 0;
221 freebsd32_set_syscall_retval(struct thread *td, int error)
223 struct trapframe *frame;
225 frame = td->td_frame;
228 frame->tf_x[0] = td->td_retval[0];
229 frame->tf_x[1] = td->td_retval[1];
230 frame->tf_spsr &= ~PSR_C;
234 * Reconstruct the pc to point at the swi.
236 if ((frame->tf_spsr & PSR_T) != 0)
237 frame->tf_elr -= 2; //THUMB_INSN_SIZE;
239 frame->tf_elr -= 4; //INSN_SIZE;
245 frame->tf_x[0] = error;
246 frame->tf_spsr |= PSR_C;
252 freebsd32_setregs(struct thread *td, struct image_params *imgp,
255 struct trapframe *tf = td->td_frame;
256 struct pcb *pcb = td->td_pcb;
258 memset(tf, 0, sizeof(struct trapframe));
261 * We need to set x0 for init as it doesn't call
262 * cpu_set_syscall_retval to copy the value. We also
263 * need to set td_retval for the cases where we do.
266 /* SP_usr is mapped to x13 */
267 tf->tf_x[13] = stack;
268 /* LR_usr is mapped to x14 */
269 tf->tf_x[14] = imgp->entry_addr;
270 tf->tf_elr = imgp->entry_addr;
271 tf->tf_spsr = PSR_M_32;
272 if ((uint32_t)imgp->entry_addr & 1)
273 tf->tf_spsr |= PSR_T;
276 vfp_reset_state(td, pcb);
280 * Clear debug register state. It is not applicable to the new process.
282 bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs));
286 elf32_dump_thread(struct thread *td, void *dst, size_t *off)