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Diffstat (limited to 'sysdeps/loongarch/dl-machine.h')
| -rw-r--r-- | sysdeps/loongarch/dl-machine.h | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h new file mode 100644 index 0000000..c69c72d --- /dev/null +++ b/sysdeps/loongarch/dl-machine.h @@ -0,0 +1,288 @@ +/* Machine-dependent ELF dynamic relocation inline functions. + Copyright (C) 2022 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 */ |