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glibc/sysdeps/loongarch/dl-machine.h

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/* Machine-dependent ELF dynamic relocation inline functions.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#ifndef dl_machine_h
#define dl_machine_h
#define ELF_MACHINE_NAME "LoongArch"
#include <entry.h>
#include <elf/elf.h>
#include <sys/asm.h>
#include <dl-tls.h>
#include <dl-static-tls.h>
#include <dl-machine-rel.h>
#ifndef _RTLD_PROLOGUE
# define _RTLD_PROLOGUE(entry) \
".globl\t" __STRING (entry) "\n\t" \
".type\t" __STRING (entry) ", @function\n\t" \
CFI_STARTPROC "\n" \
__STRING (entry) ":\n"
#endif
#ifndef _RTLD_EPILOGUE
# define _RTLD_EPILOGUE(entry) \
CFI_ENDPROC "\n\t" \
".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
#endif
#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
#define elf_machine_type_class(type) \
((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT)) \
| (ELF_RTYPE_CLASS_COPY *((type) == R_LARCH_COPY)))
#define ELF_MACHINE_NO_REL 1
#define ELF_MACHINE_NO_RELA 0
/* Return nonzero iff ELF header is compatible with the running host. */
static inline int
elf_machine_matches_host (const ElfW (Ehdr) *ehdr)
{
/* We can only run LoongArch binaries. */
if (ehdr->e_machine != EM_LOONGARCH)
return 0;
return 1;
}
/* Return the run-time load address of the shared object. */
static inline ElfW (Addr) elf_machine_load_address (void)
{
extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
return (ElfW(Addr)) &__ehdr_start;
}
/* Return the link-time address of _DYNAMIC. */
static inline ElfW (Addr) elf_machine_dynamic (void)
{
extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
}
/* Initial entry point code for the dynamic linker.
The C function `_dl_start' is the real entry point;
its return value is the user program's entry point. */
#define RTLD_START asm (\
".text\n\
" _RTLD_PROLOGUE (ENTRY_POINT) "\
.cfi_label .Ldummy \n\
" CFI_UNDEFINED (1) " \n\
or $a0, $sp, $zero \n\
bl _dl_start \n\
# Stash user entry point in s0. \n\
or $s0, $v0, $zero \n\
# Load the original argument count. \n\
ld.d $a1, $sp, 0 \n\
# Call _dl_init (struct link_map *main_map, int argc, \
char **argv, char **env) \n\
la $a0, _rtld_local \n\
ld.d $a0, $a0, 0 \n\
addi.d $a2, $sp, 8 \n\
slli.d $a3, $a1, 3 \n\
add.d $a3, $a3, $a2 \n\
addi.d $a3, $a3, 8 \n\
# Stash the stack pointer in s1.\n\
or $s1, $sp, $zero \n\
# Adjust $sp for 16-aligned \n\
bstrins.d $sp, $zero, 3, 0 \n\
# Call the function to run the initializers. \n\
bl _dl_init \n\
# Restore the stack pointer for _start.\n\
or $sp, $s1, $zero \n\
# Pass our finalizer function to _start. \n\
la $a0, _dl_fini \n\
# Jump to the user entry point. \n\
jirl $zero, $s0, 0 \n\
" _RTLD_EPILOGUE (ENTRY_POINT) "\
.previous");
/* Names of the architecture-specific auditing callback functions. */
#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
/* Bias .got.plt entry by the offset requested by the PLT header. */
#define elf_machine_plt_value(map, reloc, value) (value)
static inline ElfW (Addr)
elf_machine_fixup_plt (struct link_map *map, lookup_t t,
const ElfW (Sym) *refsym, const ElfW (Sym) *sym,
const ElfW (Rela) *reloc, ElfW (Addr) *reloc_addr,
ElfW (Addr) value)
{
return *reloc_addr = value;
}
#endif /* !dl_machine_h */
#ifdef RESOLVE_MAP
/* Perform a relocation described by R_INFO at the location pointed to
by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
MAP is the object containing the reloc. */
static inline void __attribute__ ((always_inline))
elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
const ElfW (Rela) *reloc,
const ElfW (Sym) *sym,
const struct r_found_version *version,
void *const reloc_addr, int skip_ifunc)
{
ElfW (Addr) r_info = reloc->r_info;
const unsigned long int r_type = ELFW (R_TYPE) (r_info);
ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version, r_type);
ElfW (Addr) value = 0;
if (sym_map != NULL)
value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
if (sym != NULL
&& __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
&& __glibc_likely (sym->st_shndx != SHN_UNDEF)
&& __glibc_likely (!skip_ifunc))
value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
switch (r_type)
{
case R_LARCH_JUMP_SLOT:
case __WORDSIZE == 64 ? R_LARCH_64 : R_LARCH_32:
*addr_field = value;
break;
case R_LARCH_NONE:
break;
#ifndef RTLD_BOOTSTRAP
case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64 : R_LARCH_TLS_DTPMOD32:
*addr_field = sym_map->l_tls_modid;
break;
case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64 : R_LARCH_TLS_DTPREL32:
*addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
break;
case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64 : R_LARCH_TLS_TPREL32:
CHECK_STATIC_TLS (map, sym_map);
*addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
break;
case R_LARCH_COPY:
{
if (sym == NULL)
/* This can happen in trace mode if an object could not be
found. */
break;
if (__glibc_unlikely (sym->st_size > refsym->st_size)
|| (__glibc_unlikely (sym->st_size < refsym->st_size)
&& GLRO(dl_verbose)))
{
const char *strtab;
strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
_dl_error_printf ("\
%s: Symbol `%s' has different size in shared object, consider re-linking\n",
rtld_progname ?: "<program name unknown>",
strtab + refsym->st_name);
}
memcpy (reloc_addr, (void *) value,
MIN (sym->st_size, refsym->st_size));
break;
}
case R_LARCH_RELATIVE:
*addr_field = map->l_addr + reloc->r_addend;
break;
case R_LARCH_IRELATIVE:
value = map->l_addr + reloc->r_addend;
if (__glibc_likely (!skip_ifunc))
value = ((ElfW (Addr) (*) (void)) value) ();
*addr_field = value;
break;
#endif
default:
_dl_reloc_bad_type (map, r_type, 0);
break;
}
}
static inline void __attribute__ ((always_inline))
elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) *reloc,
void *const reloc_addr)
{
*(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
}
static inline void __attribute__ ((always_inline))
elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
ElfW (Addr) l_addr,
const ElfW (Rela) *reloc, int skip_ifunc)
{
ElfW (Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
/* Check for unexpected PLT reloc type. */
if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
{
if (__glibc_unlikely (map->l_mach.plt == 0))
{
if (l_addr)
*reloc_addr += l_addr;
}
else
*reloc_addr = map->l_mach.plt;
}
else
_dl_reloc_bad_type (map, r_type, 1);
}
/* Set up the loaded object described by L so its stub function
will jump to the on-demand fixup code __dl_runtime_resolve. */
static inline int __attribute__ ((always_inline))
elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
int lazy, int profile)
{
#ifndef RTLD_BOOTSTRAP
/* If using PLTs, fill in the first two entries of .got.plt. */
if (l->l_info[DT_JMPREL])
{
extern void _dl_runtime_resolve (void)
__attribute__ ((visibility ("hidden")));
ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
gotplt[1] = (ElfW (Addr)) l;
}
#endif
return lazy;
}
#endif /* RESOLVE_MAP */
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