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freebsd-skq/sys/amd64/amd64/elf_machdep.c
dchagin e706df7b9a Implement vsyscall hack. Prior to 2.13 glibc uses vsyscall 
instead of vdso. An upcoming linux_base-c6 needs it.

Differential Revision:  https://reviews.freebsd.org/D1090

Reviewed by:	kib, trasz
MFC after:	1 week
2016-01-09 20:18:53 +00:00

295 lines
7.5 KiB
C
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/*-
* 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 = {
.sv_size = SYS_MAXSYSCALL,
.sv_table = sysent,
.sv_mask = 0,
.sv_errsize = 0,
.sv_errtbl = NULL,
.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_pagesize = PAGE_SIZE,
.sv_minuser = VM_MIN_ADDRESS,
.sv_maxuser = VM_MAXUSER_ADDRESS,
.sv_usrstack = USRSTACK,
.sv_psstrings = PS_STRINGS,
.sv_stackprot = VM_PROT_ALL,
.sv_copyout_strings = exec_copyout_strings,
.sv_setregs = exec_setregs,
.sv_fixlimit = NULL,
.sv_maxssiz = NULL,
.sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP | SV_TIMEKEEP,
.sv_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_shared_page_base = SHAREDPAGE,
.sv_shared_page_len = PAGE_SIZE,
.sv_schedtail = NULL,
.sv_thread_detach = NULL,
.sv_trap = NULL,
};
INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
static Elf64_Brandinfo freebsd_brand_info = {
.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,
.interp_newpath = NULL,
.brand_note = &elf64_freebsd_brandnote,
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
};
SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_FIRST,
(sysinit_cfunc_t) elf64_insert_brand_entry,
&freebsd_brand_info);
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,
.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,
.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;
}
/* Process one elf relocation with addend. */
static int
elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
int type, int local, 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:
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);
}
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 */
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\n");
return -1;
break;
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 = relocbase + addend;
val = addr;
if (*where != val)
*where = val;
break;
default:
printf("kldload: unexpected relocation type %ld\n",
rtype);
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, 0, 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, 1, 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);
}
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