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f-stack/freebsd/mips/mips/elf_machdep.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.
*
* from: src/sys/i386/i386/elf_machdep.c,v 1.20 2004/08/11 02:35:05 marcel
*/
#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/sysent.h>
#include <sys/imgact_elf.h>
#include <sys/proc.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/md_var.h>
#include <machine/cache.h>
#ifdef __mips_n64
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_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_schedtail = NULL,
.sv_thread_detach = NULL,
.sv_trap = NULL,
};
static Elf64_Brandinfo freebsd_brand_info = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_MIPS,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/libexec/ld-elf.so.1",
.sysvec = &elf64_freebsd_sysvec,
.interp_newpath = NULL,
.flags = 0
};
SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
(sysinit_cfunc_t) elf64_insert_brand_entry,
&freebsd_brand_info);
void
elf64_dump_thread(struct thread *td __unused, void *dst __unused,
size_t *off __unused)
{
}
#else
struct sysentvec elf32_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 ELF32",
.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_ILP32,
.sv_set_syscall_retval = cpu_set_syscall_retval,
.sv_fetch_syscall_args = cpu_fetch_syscall_args,
.sv_syscallnames = syscallnames,
.sv_schedtail = NULL,
.sv_thread_detach = NULL,
.sv_trap = NULL,
};
static Elf32_Brandinfo freebsd_brand_info = {
.brand = ELFOSABI_FREEBSD,
.machine = EM_MIPS,
.compat_3_brand = "FreeBSD",
.emul_path = NULL,
.interp_path = "/libexec/ld-elf.so.1",
.sysvec = &elf32_freebsd_sysvec,
.interp_newpath = NULL,
.flags = 0
};
SYSINIT(elf32, SI_SUB_EXEC, SI_ORDER_FIRST,
(sysinit_cfunc_t) elf32_insert_brand_entry,
&freebsd_brand_info);
void
elf32_dump_thread(struct thread *td __unused, void *dst __unused,
size_t *off __unused)
{
}
#endif
/* 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)
{
Elf32_Addr *where = (Elf32_Addr *)NULL;
Elf_Addr addr;
Elf_Addr addend = (Elf_Addr)0;
Elf_Word rtype = (Elf_Word)0, symidx;
const Elf_Rel *rel = NULL;
const Elf_Rela *rela = NULL;
int error;
/*
* Stash R_MIPS_HI16 info so we can use it when processing R_MIPS_LO16
*/
static Elf_Addr ahl;
static Elf32_Addr *where_hi16;
switch (type) {
case ELF_RELOC_REL:
rel = (const Elf_Rel *)data;
where = (Elf32_Addr *) (relocbase + rel->r_offset);
rtype = ELF_R_TYPE(rel->r_info);
symidx = ELF_R_SYM(rel->r_info);
switch (rtype) {
case R_MIPS_64:
addend = *(Elf64_Addr *)where;
break;
default:
addend = *where;
break;
}
break;
case ELF_RELOC_RELA:
rela = (const Elf_Rela *)data;
where = (Elf32_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_MIPS_NONE: /* none */
break;
case R_MIPS_32: /* S + A */
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addr += addend;
if (*where != addr)
*where = (Elf32_Addr)addr;
break;
case R_MIPS_26: /* ((A << 2) | (P & 0xf0000000) + S) >> 2 */
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addend &= 0x03ffffff;
/*
* Addendum for .rela R_MIPS_26 is not shifted right
*/
if (rela == NULL)
addend <<= 2;
addr += ((Elf_Addr)where & 0xf0000000) | addend;
addr >>= 2;
*where &= ~0x03ffffff;
*where |= addr & 0x03ffffff;
break;
case R_MIPS_64: /* S + A */
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addr += addend;
if (*(Elf64_Addr*)where != addr)
*(Elf64_Addr*)where = addr;
break;
case R_MIPS_HI16: /* ((AHL + S) - ((short)(AHL + S)) >> 16 */
if (rela != NULL) {
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addr += addend;
*where &= 0xffff0000;
*where |= ((((long long) addr + 0x8000LL) >> 16) & 0xffff);
}
else {
ahl = addend << 16;
where_hi16 = where;
}
break;
case R_MIPS_LO16: /* AHL + S */
if (rela != NULL) {
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addr += addend;
*where &= 0xffff0000;
*where |= addr & 0xffff;
}
else {
ahl += (int16_t)addend;
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addend &= 0xffff0000;
addend |= (uint16_t)(ahl + addr);
*where = addend;
addend = *where_hi16;
addend &= 0xffff0000;
addend |= ((ahl + addr) - (int16_t)(ahl + addr)) >> 16;
*where_hi16 = addend;
}
break;
case R_MIPS_HIGHER: /* %higher(A+S) */
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addr += addend;
*where &= 0xffff0000;
*where |= (((long long)addr + 0x80008000LL) >> 32) & 0xffff;
break;
case R_MIPS_HIGHEST: /* %highest(A+S) */
error = lookup(lf, symidx, 1, &addr);
if (error != 0)
return (-1);
addr += addend;
*where &= 0xffff0000;
*where |= (((long long)addr + 0x800080008000LL) >> 48) & 0xffff;
break;
default:
printf("kldload: unexpected relocation type %d\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)
{
/*
* Sync the I and D caches to make sure our relocations are visible.
*/
mips_icache_sync_all();
return (0);
}
int
elf_cpu_unload_file(linker_file_t lf __unused)
{
return (0);
}
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