/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright 1996-1998 John D. Polstra.
* All rights reserved.
*
* 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 ``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 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("$FreeBSD$");
#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 <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_param.h>
#include <machine/elf.h>
#include <machine/fpu.h>
#include <machine/md_var.h>
struct sysentvec elf64_freebsd_sysvec_la48 = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = sysent,
.sv_transtrap = NULL,
.sv_fixup = __elfN(freebsd_fixup),
.sv_sendsig = sendsig,
.sv_sigcode = sigcode,
.sv_szsigcode = &szsigcode,
.sv_name = "FreeBSD ELF64",
.sv_coredump = __elfN(coredump),
.sv_imgact_try = NULL,
.sv_minsigstksz = MINSIGSTKSZ,
.sv_minuser = VM_MIN_ADDRESS,
.sv_maxuser = VM_MAXUSER_ADDRESS_LA48,
.sv_usrstack = USRSTACK_LA48,
.sv_psstrings = PS_STRINGS_LA48,
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
.sv_copyout_strings = exec_copyout_strings,
.sv_setregs = exec_setregs,
.sv_fixlimit = NULL,
.sv_maxssiz = NULL,
.sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP |
SV_TIMEKEEP | SV_RNG_SEED_VER,
.sv_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_shared_page_base = SHAREDPAGE_LA48,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
.sv_thread_detach = NULL,
.sv_trap = NULL,
.sv_stackgap = elf64_stackgap,
};
struct sysentvec elf64_freebsd_sysvec_la57 = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = sysent,
.sv_transtrap = NULL,
.sv_fixup = __elfN(freebsd_fixup),
.sv_sendsig = sendsig,
.sv_sigcode = sigcode,
.sv_szsigcode = &szsigcode,
.sv_name = "FreeBSD ELF64",
.sv_coredump = __elfN(coredump),
.sv_imgact_try = NULL,
.sv_minsigstksz = MINSIGSTKSZ,
.sv_minuser = VM_MIN_ADDRESS,
.sv_maxuser = VM_MAXUSER_ADDRESS_LA57,
.sv_usrstack = USRSTACK_LA57,
.sv_psstrings = PS_STRINGS_LA57,
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_auxargs = __elfN(freebsd_copyout_auxargs),
.sv_copyout_strings = exec_copyout_strings,
.sv_setregs = exec_setregs,
.sv_fixlimit = NULL,
.sv_maxssiz = NULL,
.sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_LP64 | SV_SHP |
SV_TIMEKEEP | SV_RNG_SEED_VER,
.sv_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_shared_page_base = SHAREDPAGE_LA57,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
.sv_thread_detach = NULL,
.sv_trap = NULL,
.sv_stackgap = elf64_stackgap,
};
static void
amd64_init_sysvecs(void *arg)
{
amd64_lower_shared_page(&elf64_freebsd_sysvec_la48);
if (la57) {
exec_sysvec_init(&elf64_freebsd_sysvec_la57);
exec_sysvec_init_secondary(&elf64_freebsd_sysvec_la57,
&elf64_freebsd_sysvec_la48);
} else {
exec_sysvec_init(&elf64_freebsd_sysvec_la48);
}
}
SYSINIT(elf64_sysvec, SI_SUB_EXEC, SI_ORDER_ANY, amd64_init_sysvecs, NULL);
void
amd64_lower_shared_page(struct sysentvec *sv)
{
if (hw_lower_amd64_sharedpage != 0) {
sv->sv_maxuser -= PAGE_SIZE;
sv->sv_shared_page_base -= PAGE_SIZE;
sv->sv_usrstack -= PAGE_SIZE;
sv->sv_psstrings -= PAGE_SIZE;
}
}
static boolean_t
freebsd_brand_info_la57_img_compat(struct image_params *imgp,
int32_t *osrel __unused, uint32_t *fctl0)
{
if ((imgp->proc->p_md.md_flags & P_MD_LA57) != 0)
return (TRUE);
if (fctl0 == NULL || (*fctl0 & NT_FREEBSD_FCTL_LA48) != 0)
return (FALSE);
if ((imgp->proc->p_md.md_flags & P_MD_LA48) != 0)
return (FALSE);
return (TRUE);
}
static Elf64_Brandinfo freebsd_brand_info_la48 = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_X86_64,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/libexec/ld-elf.so.1",
.sysvec = &elf64_freebsd_sysvec_la48,
.interp_newpath = NULL,
.brand_note = &elf64_freebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
};
static Elf64_Brandinfo freebsd_brand_info_la57 = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_X86_64,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/libexec/ld-elf.so.1",
.sysvec = &elf64_freebsd_sysvec_la57,
.interp_newpath = NULL,
.brand_note = &elf64_freebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
.header_supported = freebsd_brand_info_la57_img_compat,
};
static void
sysinit_register_elf64_brand_entries(void *arg __unused)
{
/*
* _57 must go first so it can either claim the image or hand
* it to _48.
*/
if (la57)
elf64_insert_brand_entry(&freebsd_brand_info_la57);
elf64_insert_brand_entry(&freebsd_brand_info_la48);
}
SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
sysinit_register_elf64_brand_entries, NULL);
static Elf64_Brandinfo freebsd_brand_oinfo = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_X86_64,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/usr/libexec/ld-elf.so.1",
.sysvec = &elf64_freebsd_sysvec_la48,
.interp_newpath = NULL,
.brand_note = &elf64_freebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
};
SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
(sysinit_cfunc_t)elf64_insert_brand_entry, &freebsd_brand_oinfo);
static Elf64_Brandinfo kfreebsd_brand_info = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_X86_64,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/lib/ld-kfreebsd-x86-64.so.1",
.sysvec = &elf64_freebsd_sysvec_la48,
.interp_newpath = NULL,
.brand_note = &elf64_kfreebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY
};
SYSINIT(kelf64, SI_SUB_EXEC, SI_ORDER_ANY,
(sysinit_cfunc_t)elf64_insert_brand_entry, &kfreebsd_brand_info);
void
elf64_dump_thread(struct thread *td, void *dst, size_t *off)
{
void *buf;
size_t len;
len = 0;
if (use_xsave) {
if (dst != NULL) {
fpugetregs(td);
len += elf64_populate_note(NT_X86_XSTATE,
get_pcb_user_save_td(td), dst,
cpu_max_ext_state_size, &buf);
*(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) =
xsave_mask;
} else
len += elf64_populate_note(NT_X86_XSTATE, NULL, NULL,
cpu_max_ext_state_size, NULL);
}
*off = len;
}
bool
elf_is_ifunc_reloc(Elf_Size r_info)
{
return (ELF_R_TYPE(r_info) == R_X86_64_IRELATIVE);
}
/* Process one elf relocation with addend. */
static int
elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, bool late_ifunc, elf_lookup_fn lookup)
{
Elf64_Addr *where, val;
Elf32_Addr *where32, val32;
Elf_Addr addr;
Elf_Addr addend;
Elf_Size rtype, symidx;
const Elf_Rel *rel;
const Elf_Rela *rela;
int error;
switch (type) {
case ELF_RELOC_REL:
rel = (const Elf_Rel *)data;
where = (Elf_Addr *) (relocbase + rel->r_offset);
rtype = ELF_R_TYPE(rel->r_info);
symidx = ELF_R_SYM(rel->r_info);
/* Addend is 32 bit on 32 bit relocs */
switch (rtype) {
case R_X86_64_PC32:
case R_X86_64_32S:
case R_X86_64_PLT32:
addend = *(Elf32_Addr *)where;
break;
default:
addend = *where;
break;
}
break;
case ELF_RELOC_RELA:
rela = (const Elf_Rela *)data;
where = (Elf_Addr *) (relocbase + rela->r_offset);
addend = rela->r_addend;
rtype = ELF_R_TYPE(rela->r_info);
symidx = ELF_R_SYM(rela->r_info);
break;
default:
panic("unknown reloc type %d\n", type);
}
if (late_ifunc) {
KASSERT(type == ELF_RELOC_RELA,
("Only RELA ifunc relocations are supported"));
if (rtype != R_X86_64_IRELATIVE)
return (0);
}
switch (rtype) {
case R_X86_64_NONE: /* none */
break;
case R_X86_64_64: /* S + A */
error = lookup(lf, symidx, 1, &addr);
val = addr + addend;
if (error != 0)
return (-1);
if (*where != val)
*where = val;
break;
case R_X86_64_PC32: /* S + A - P */
case R_X86_64_PLT32: /* L + A - P, L is PLT location for
the symbol, which we treat as S */
error = lookup(lf, symidx, 1, &addr);
where32 = (Elf32_Addr *)where;
val32 = (Elf32_Addr)(addr + addend - (Elf_Addr)where);
if (error != 0)
return (-1);
if (*where32 != val32)
*where32 = val32;
break;
case R_X86_64_32S: /* S + A sign extend */
error = lookup(lf, symidx, 1, &addr);
val32 = (Elf32_Addr)(addr + addend);
where32 = (Elf32_Addr *)where;
if (error != 0)
return (-1);
if (*where32 != val32)
*where32 = val32;
break;
case R_X86_64_COPY: /* none */
/*
* There shouldn't be copy relocations in kernel
* objects.
*/
printf("kldload: unexpected R_COPY relocation, "
"symbol index %ld\n", symidx);
return (-1);
case R_X86_64_GLOB_DAT: /* S */
case R_X86_64_JMP_SLOT: /* XXX need addend + offset */
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
if (*where != addr)
*where = addr;
break;
case R_X86_64_RELATIVE: /* B + A */
addr = elf_relocaddr(lf, relocbase + addend);
val = addr;
if (*where != val)
*where = val;
break;
case R_X86_64_IRELATIVE:
addr = relocbase + addend;
val = ((Elf64_Addr (*)(void))addr)();
if (*where != val)
*where = val;
break;
default:
printf("kldload: unexpected relocation type %ld, "
"symbol index %ld\n", rtype, symidx);
return (-1);
}
return (0);
}
int
elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
elf_lookup_fn lookup)
{
return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
}
int
elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, elf_lookup_fn lookup)
{
return (elf_reloc_internal(lf, relocbase, data, type, false, lookup));
}
int
elf_reloc_late(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, elf_lookup_fn lookup)
{
return (elf_reloc_internal(lf, relocbase, data, type, true, lookup));
}
int
elf_cpu_load_file(linker_file_t lf __unused)
{
return (0);
}
int
elf_cpu_unload_file(linker_file_t lf __unused)
{
return (0);
}
int
elf_cpu_parse_dynamic(caddr_t loadbase __unused, Elf_Dyn *dynamic __unused)
{
return (0);
}
