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 #define __ELF_WORD_SIZE 32
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/systm.h>
42 #include <sys/imgact.h>
43 #include <sys/linker.h>
46 #include <sys/sysent.h>
47 #include <sys/imgact_elf.h>
48 #include <sys/syscall.h>
49 #include <sys/signalvar.h>
50 #include <sys/vnode.h>
52 #include <machine/elf.h>
53 #include <machine/pcb.h>
55 #include <machine/vfp.h>
58 #include <compat/freebsd32/freebsd32_util.h>
60 #define FREEBSD32_MINUSER 0x00001000
61 #define FREEBSD32_MAXUSER ((1ul << 32) - PAGE_SIZE)
62 #define FREEBSD32_SHAREDPAGE (FREEBSD32_MAXUSER - PAGE_SIZE)
63 #define FREEBSD32_USRSTACK FREEBSD32_SHAREDPAGE
65 extern const char *freebsd32_syscallnames[];
67 extern char aarch32_sigcode[];
68 extern int sz_aarch32_sigcode;
70 static int freebsd32_fetch_syscall_args(struct thread *td);
71 static void freebsd32_setregs(struct thread *td, struct image_params *imgp,
73 static void freebsd32_set_syscall_retval(struct thread *, int);
75 static bool elf32_arm_abi_supported(struct image_params *, int32_t *,
78 extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
80 u_long __read_frequently elf32_hwcap;
81 u_long __read_frequently elf32_hwcap2;
83 static struct sysentvec elf32_freebsd_sysvec = {
84 .sv_size = SYS_MAXSYSCALL,
85 .sv_table = freebsd32_sysent,
86 .sv_fixup = elf32_freebsd_fixup,
87 .sv_sendsig = freebsd32_sendsig,
88 .sv_sigcode = aarch32_sigcode,
89 .sv_szsigcode = &sz_aarch32_sigcode,
90 .sv_name = "FreeBSD ELF32",
91 .sv_coredump = elf32_coredump,
92 .sv_elf_core_osabi = ELFOSABI_FREEBSD,
93 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
94 .sv_elf_core_prepare_notes = elf32_prepare_notes,
95 .sv_minsigstksz = MINSIGSTKSZ,
96 .sv_minuser = FREEBSD32_MINUSER,
97 .sv_maxuser = FREEBSD32_MAXUSER,
98 .sv_usrstack = FREEBSD32_USRSTACK,
99 .sv_psstrings = FREEBSD32_PS_STRINGS,
100 .sv_psstringssz = sizeof(struct freebsd32_ps_strings),
101 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
102 .sv_copyout_auxargs = elf32_freebsd_copyout_auxargs,
103 .sv_copyout_strings = freebsd32_copyout_strings,
104 .sv_setregs = freebsd32_setregs,
105 .sv_fixlimit = NULL, // XXX
107 .sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_TIMEKEEP |
109 .sv_set_syscall_retval = freebsd32_set_syscall_retval,
110 .sv_fetch_syscall_args = freebsd32_fetch_syscall_args,
111 .sv_syscallnames = freebsd32_syscallnames,
112 .sv_shared_page_base = FREEBSD32_SHAREDPAGE,
113 .sv_shared_page_len = PAGE_SIZE,
114 .sv_schedtail = NULL,
115 .sv_thread_detach = NULL,
117 .sv_hwcap = &elf32_hwcap,
118 .sv_hwcap2 = &elf32_hwcap2,
119 .sv_onexec_old = exec_onexec_old,
120 .sv_onexit = exit_onexit,
121 .sv_regset_begin = SET_BEGIN(__elfN(regset)),
122 .sv_regset_end = SET_LIMIT(__elfN(regset)),
124 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
126 static Elf32_Brandinfo freebsd32_brand_info = {
127 .brand = ELFOSABI_FREEBSD,
129 .compat_3_brand = "FreeBSD",
130 .interp_path = "/libexec/ld-elf.so.1",
131 .sysvec = &elf32_freebsd_sysvec,
132 .interp_newpath = "/libexec/ld-elf32.so.1",
133 .brand_note = &elf32_freebsd_brandnote,
134 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
135 .header_supported= elf32_arm_abi_supported,
138 SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
139 (sysinit_cfunc_t)elf32_insert_brand_entry, &freebsd32_brand_info);
142 elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
143 uint32_t *fctl0 __unused)
145 const Elf32_Ehdr *hdr;
147 /* Check if we support AArch32 */
148 if (ID_AA64PFR0_EL0_VAL(READ_SPECIALREG(id_aa64pfr0_el1)) !=
149 ID_AA64PFR0_EL0_64_32)
152 #define EF_ARM_EABI_FREEBSD_MIN EF_ARM_EABI_VER4
153 hdr = (const Elf32_Ehdr *)imgp->image_header;
154 if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
156 uprintf("Attempting to execute non EABI binary "
158 EF_ARM_EABI_VERSION(hdr->e_flags),
167 freebsd32_fetch_syscall_args(struct thread *td)
171 struct syscall_args *sa;
172 int error, i, nap, narg;
173 unsigned int args[4];
177 ap = td->td_frame->tf_x;
180 /* r7 is the syscall id */
181 sa->code = td->td_frame->tf_x[7];
182 sa->original_code = sa->code;
184 if (sa->code == SYS_syscall) {
187 } else if (sa->code == SYS___syscall) {
193 if (sa->code >= p->p_sysent->sv_size)
194 sa->callp = &p->p_sysent->sv_table[0];
196 sa->callp = &p->p_sysent->sv_table[sa->code];
198 narg = sa->callp->sy_narg;
199 for (i = 0; i < nap; i++)
202 if (narg - nap > nitems(args))
203 panic("Too many system call arguiments");
204 error = copyin((void *)td->td_frame->tf_x[13], args,
205 (narg - nap) * sizeof(int));
208 for (i = 0; i < (narg - nap); i++)
209 sa->args[i + nap] = args[i];
212 td->td_retval[0] = 0;
213 td->td_retval[1] = 0;
219 freebsd32_set_syscall_retval(struct thread *td, int error)
221 struct trapframe *frame;
223 frame = td->td_frame;
226 frame->tf_x[0] = td->td_retval[0];
227 frame->tf_x[1] = td->td_retval[1];
228 frame->tf_spsr &= ~PSR_C;
232 * Reconstruct the pc to point at the swi.
234 if ((frame->tf_spsr & PSR_T) != 0)
235 frame->tf_elr -= 2; //THUMB_INSN_SIZE;
237 frame->tf_elr -= 4; //INSN_SIZE;
243 frame->tf_x[0] = error;
244 frame->tf_spsr |= PSR_C;
250 freebsd32_setregs(struct thread *td, struct image_params *imgp,
253 struct trapframe *tf = td->td_frame;
254 struct pcb *pcb = td->td_pcb;
256 memset(tf, 0, sizeof(struct trapframe));
259 * We need to set x0 for init as it doesn't call
260 * cpu_set_syscall_retval to copy the value. We also
261 * need to set td_retval for the cases where we do.
264 /* SP_usr is mapped to x13 */
265 tf->tf_x[13] = stack;
266 /* LR_usr is mapped to x14 */
267 tf->tf_x[14] = imgp->entry_addr;
268 tf->tf_elr = imgp->entry_addr;
269 tf->tf_spsr = PSR_M_32;
270 if ((uint32_t)imgp->entry_addr & 1)
271 tf->tf_spsr |= PSR_T;
274 vfp_reset_state(td, pcb);
278 * Clear debug register state. It is not applicable to the new process.
280 bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs));
284 elf32_dump_thread(struct thread *td, void *dst, size_t *off)