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/*-
* Copyright (c) 2014, 2015 The FreeBSD Foundation.
* Copyright (c) 2014, 2017 Andrew Turner.
* Copyright (c) 2018 Olivier Houchard
* All rights reserved.
*
* This software was developed by Andrew Turner under
* sponsorship from the FreeBSD Foundation.
*
* Portions of this software were developed by Konstantin Belousov
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#define __ELF_WORD_SIZE 32
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/imgact.h>
#include <sys/linker.h>
#include <sys/proc.h>
#include <sys/sysent.h>
#include <sys/imgact_elf.h>
#include <sys/syscall.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <machine/elf.h>
#ifdef VFP
#include <machine/vfp.h>
#endif
#include <compat/freebsd32/freebsd32_util.h>
#define FREEBSD32_MINUSER 0x00001000
#define FREEBSD32_MAXUSER ((1ul << 32) - PAGE_SIZE)
#define FREEBSD32_SHAREDPAGE (FREEBSD32_MAXUSER - PAGE_SIZE)
#define FREEBSD32_USRSTACK FREEBSD32_SHAREDPAGE
extern const char *freebsd32_syscallnames[];
extern char aarch32_sigcode[];
extern int sz_aarch32_sigcode;
static int freebsd32_fetch_syscall_args(struct thread *td);
static void freebsd32_setregs(struct thread *td, struct image_params *imgp,
u_long stack);
static void freebsd32_set_syscall_retval(struct thread *, int);
static boolean_t elf32_arm_abi_supported(struct image_params *, int32_t *,
uint32_t *);
extern void freebsd32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
static struct sysentvec elf32_freebsd_sysvec = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = freebsd32_sysent,
.sv_transtrap = NULL,
.sv_fixup = elf32_freebsd_fixup,
.sv_sendsig = freebsd32_sendsig,
.sv_sigcode = aarch32_sigcode,
.sv_szsigcode = &sz_aarch32_sigcode,
.sv_name = "FreeBSD ELF32",
.sv_coredump = elf32_coredump,
.sv_imgact_try = NULL,
.sv_minsigstksz = MINSIGSTKSZ,
.sv_minuser = FREEBSD32_MINUSER,
.sv_maxuser = FREEBSD32_MAXUSER,
.sv_usrstack = FREEBSD32_USRSTACK,
.sv_psstrings = FREEBSD32_PS_STRINGS,
.sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
.sv_copyout_auxargs = elf32_freebsd_copyout_auxargs,
.sv_copyout_strings = freebsd32_copyout_strings,
.sv_setregs = freebsd32_setregs,
.sv_fixlimit = NULL, // XXX
.sv_maxssiz = NULL,
.sv_flags = SV_ABI_FREEBSD | SV_ILP32 | SV_SHP | SV_TIMEKEEP |
SV_RNG_SEED_VER,
.sv_set_syscall_retval = freebsd32_set_syscall_retval,
.sv_fetch_syscall_args = freebsd32_fetch_syscall_args,
.sv_syscallnames = freebsd32_syscallnames,
.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
.sv_thread_detach = NULL,
.sv_trap = NULL,
};
INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
static Elf32_Brandinfo freebsd32_brand_info = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_ARM,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/libexec/ld-elf.so.1",
.sysvec = &elf32_freebsd_sysvec,
.interp_newpath = "/libexec/ld-elf32.so.1",
.brand_note = &elf32_freebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
.header_supported= elf32_arm_abi_supported,
};
SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
(sysinit_cfunc_t)elf32_insert_brand_entry, &freebsd32_brand_info);
static boolean_t
elf32_arm_abi_supported(struct image_params *imgp, int32_t *osrel __unused,
uint32_t *fctl0 __unused)
{
const Elf32_Ehdr *hdr;
/* Check if we support AArch32 */
if (ID_AA64PFR0_EL0_VAL(READ_SPECIALREG(id_aa64pfr0_el1)) !=
ID_AA64PFR0_EL0_64_32)
return (FALSE);
#define EF_ARM_EABI_VERSION(x) (((x) & EF_ARM_EABIMASK) >> 24)
#define EF_ARM_EABI_FREEBSD_MIN 4
hdr = (const Elf32_Ehdr *)imgp->image_header;
if (EF_ARM_EABI_VERSION(hdr->e_flags) < EF_ARM_EABI_FREEBSD_MIN) {
if (bootverbose)
uprintf("Attempting to execute non EABI binary "
"(rev %d) image %s",
EF_ARM_EABI_VERSION(hdr->e_flags),
imgp->args->fname);
return (FALSE);
}
return (TRUE);
}
static int
freebsd32_fetch_syscall_args(struct thread *td)
{
struct proc *p;
register_t *ap;
struct syscall_args *sa;
int error, i, nap, narg;
unsigned int args[4];
nap = 4;
p = td->td_proc;
ap = td->td_frame->tf_x;
sa = &td->td_sa;
/* r7 is the syscall id */
sa->code = td->td_frame->tf_x[7];
if (sa->code == SYS_syscall) {
sa->code = *ap++;
nap--;
} else if (sa->code == SYS___syscall) {
sa->code = ap[1];
nap -= 2;
ap += 2;
}
if (sa->code >= p->p_sysent->sv_size)
sa->callp = &p->p_sysent->sv_table[0];
else
sa->callp = &p->p_sysent->sv_table[sa->code];
narg = sa->callp->sy_narg;
for (i = 0; i < nap; i++)
sa->args[i] = ap[i];
if (narg > nap) {
if (narg - nap > nitems(args))
panic("Too many system call arguiments");
error = copyin((void *)td->td_frame->tf_x[13], args,
(narg - nap) * sizeof(int));
for (i = 0; i < (narg - nap); i++)
sa->args[i + nap] = args[i];
}
td->td_retval[0] = 0;
td->td_retval[1] = 0;
return (0);
}
static void
freebsd32_set_syscall_retval(struct thread *td, int error)
{
struct trapframe *frame;
frame = td->td_frame;
switch (error) {
case 0:
frame->tf_x[0] = td->td_retval[0];
frame->tf_x[1] = td->td_retval[1];
frame->tf_spsr &= ~PSR_C;
break;
case ERESTART:
/*
* Reconstruct the pc to point at the swi.
*/
if ((frame->tf_spsr & PSR_T) != 0)
frame->tf_elr -= 2; //THUMB_INSN_SIZE;
else
frame->tf_elr -= 4; //INSN_SIZE;
break;
case EJUSTRETURN:
/* nothing to do */
break;
default:
frame->tf_x[0] = error;
frame->tf_spsr |= PSR_C;
break;
}
}
static void
freebsd32_setregs(struct thread *td, struct image_params *imgp,
uintptr_t stack)
{
struct trapframe *tf = td->td_frame;
struct pcb *pcb = td->td_pcb;
memset(tf, 0, sizeof(struct trapframe));
/*
* We need to set x0 for init as it doesn't call
* cpu_set_syscall_retval to copy the value. We also
* need to set td_retval for the cases where we do.
*/
tf->tf_x[0] = stack;
/* SP_usr is mapped to x13 */
tf->tf_x[13] = stack;
/* LR_usr is mapped to x14 */
tf->tf_x[14] = imgp->entry_addr;
tf->tf_elr = imgp->entry_addr;
tf->tf_spsr = PSR_M_32;
#ifdef VFP
vfp_reset_state(td, pcb);
#endif
/*
* Clear debug register state. It is not applicable to the new process.
*/
bzero(&pcb->pcb_dbg_regs, sizeof(pcb->pcb_dbg_regs));
}
void
elf32_dump_thread(struct thread *td, void *dst, size_t *off)
{
/* XXX: VFP */
}
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