| /* Copyright (C) 1995-2018 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef dl_machine_h |
| #define dl_machine_h |
| |
| #define ELF_MACHINE_NAME "microblaze" |
| |
| #include <sys/param.h> |
| #include <tls.h> |
| |
| /* Return nonzero iff ELF header is compatible with the running host. */ |
| static inline int |
| elf_machine_matches_host (const Elf32_Ehdr *ehdr) |
| { |
| return (ehdr->e_machine == EM_MICROBLAZE); |
| } |
| |
| /* Return the link-time address of _DYNAMIC. Conveniently, this is the |
| first element of the GOT. This must be inlined in a function which |
| uses global data. */ |
| static inline Elf32_Addr |
| elf_machine_dynamic (void) |
| { |
| /* This produces a GOTOFF reloc that resolves to zero at link time, so in |
| fact just loads from the GOT register directly. By doing it without |
| an asm we can let the compiler choose any register. */ |
| |
| Elf32_Addr got_entry_0; |
| __asm__ __volatile__( |
| "lwi %0,r20,0" |
| :"=r"(got_entry_0) |
| ); |
| return got_entry_0; |
| } |
| |
| /* Return the run-time load address of the shared object. */ |
| static inline Elf32_Addr |
| elf_machine_load_address (void) |
| { |
| /* Compute the difference between the runtime address of _DYNAMIC as seen |
| by a GOTOFF reference, and the link-time address found in the special |
| unrelocated first GOT entry. */ |
| |
| Elf32_Addr dyn; |
| __asm__ __volatile__ ( |
| "addik %0,r20,_DYNAMIC@GOTOFF" |
| : "=r"(dyn) |
| ); |
| return dyn - elf_machine_dynamic (); |
| } |
| |
| /* Set up the loaded object described by L so its unrelocated PLT |
| entries will jump to the on-demand fixup code in dl-runtime.c. */ |
| |
| static inline int __attribute__ ((always_inline)) |
| elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) |
| { |
| extern void _dl_runtime_resolve (Elf32_Word); |
| extern void _dl_runtime_profile (Elf32_Word); |
| |
| return lazy; |
| } |
| |
| /* The PLT uses Elf32_Rela relocs. */ |
| #define elf_machine_relplt elf_machine_rela |
| |
| /* Mask identifying addresses reserved for the user program, |
| where the dynamic linker should not map anything. */ |
| #define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL |
| |
| /* 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\ |
| .globl _start\n\ |
| .type _start,@function\n\ |
| _start:\n\ |
| addk r5,r0,r1\n\ |
| addk r3,r0,r0\n\ |
| 1:\n\ |
| addik r5,r5,4\n\ |
| lw r4,r5,r0\n\ |
| bneid r4,1b\n\ |
| addik r3,r3,1\n\ |
| addik r3,r3,-1\n\ |
| addk r5,r0,r1\n\ |
| sw r3,r5,r0\n\ |
| addik r1,r1,-24\n\ |
| sw r15,r1,r0\n\ |
| brlid r15,_dl_start\n\ |
| nop\n\ |
| /* FALLTHRU. */\n\ |
| \n\ |
| .globl _dl_start_user\n\ |
| .type _dl_start_user,@function\n\ |
| _dl_start_user:\n\ |
| mfs r20,rpc\n\ |
| addik r20,r20,_GLOBAL_OFFSET_TABLE_+8\n\ |
| lwi r4,r20,_dl_skip_args@GOTOFF\n\ |
| lwi r5,r1,24\n\ |
| rsubk r5,r4,r5\n\ |
| addk r4,r4,r4\n\ |
| addk r4,r4,r4\n\ |
| addk r1,r1,r4\n\ |
| swi r5,r1,24\n\ |
| swi r3,r1,20\n\ |
| addk r6,r5,r0\n\ |
| addk r5,r5,r5\n\ |
| addk r5,r5,r5\n\ |
| addik r7,r1,28\n\ |
| addk r8,r7,r5\n\ |
| addik r8,r8,4\n\ |
| lwi r5,r20,_rtld_local@GOTOFF\n\ |
| brlid r15,_dl_init\n\ |
| nop\n\ |
| lwi r5,r1,24\n\ |
| lwi r3,r1,20\n\ |
| addk r4,r5,r5\n\ |
| addk r4,r4,r4\n\ |
| addik r6,r1,28\n\ |
| addk r7,r6,r4\n\ |
| addik r7,r7,4\n\ |
| addik r15,r20,_dl_fini@GOTOFF\n\ |
| addik r15,r15,-8\n\ |
| brad r3\n\ |
| addik r1,r1,24\n\ |
| nop\n\ |
| .size _dl_start_user, . - _dl_start_user\n\ |
| .previous"); |
| |
| /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or |
| TLS variable, so undefined references should not be allowed to |
| define the value. |
| ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one |
| of the main executable's symbols, as for a COPY reloc. */ |
| #ifndef RTLD_BOOTSTRAP |
| # define elf_machine_type_class(type) \ |
| (((type) == R_MICROBLAZE_JUMP_SLOT || \ |
| (type) == R_MICROBLAZE_TLSDTPREL32 || \ |
| (type) == R_MICROBLAZE_TLSDTPMOD32 || \ |
| (type) == R_MICROBLAZE_TLSTPREL32) \ |
| * ELF_RTYPE_CLASS_PLT \ |
| | ((type) == R_MICROBLAZE_COPY) * ELF_RTYPE_CLASS_COPY) |
| #else |
| # define elf_machine_type_class(type) \ |
| (((type) == R_MICROBLAZE_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT \ |
| | ((type) == R_MICROBLAZE_COPY) * ELF_RTYPE_CLASS_COPY) |
| #endif |
| |
| /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ |
| #define ELF_MACHINE_JMP_SLOT R_MICROBLAZE_JUMP_SLOT |
| |
| /* The microblaze never uses Elf32_Rel relocations. */ |
| #define ELF_MACHINE_NO_REL 1 |
| #define ELF_MACHINE_NO_RELA 0 |
| |
| static inline Elf32_Addr |
| elf_machine_fixup_plt (struct link_map *map, lookup_t t, |
| const ElfW(Sym) *refsym, const ElfW(Sym) *sym, |
| const Elf32_Rela *reloc, |
| Elf32_Addr *reloc_addr, Elf32_Addr value) |
| { |
| return *reloc_addr = value; |
| } |
| |
| /* Return the final value of a plt relocation. Ignore the addend. */ |
| static inline Elf32_Addr |
| elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, |
| Elf32_Addr value) |
| { |
| return value; |
| } |
| |
| #endif /* !dl_machine_h. */ |
| |
| /* Names of the architecture-specific auditing callback functions. */ |
| #define ARCH_LA_PLTENTER microblaze_gnu_pltenter |
| #define ARCH_LA_PLTEXIT microblaze_gnu_pltexit |
| |
| #ifdef RESOLVE_MAP |
| |
| /* Perform the relocation specified by RELOC and SYM (which is fully resolved). |
| MAP is the object containing the reloc. */ |
| |
| /* Macro to put 32-bit relocation value into 2 words. */ |
| #define PUT_REL_64(rel_addr,val) \ |
| do { \ |
| ((unsigned short *)(rel_addr))[1] = (val) >> 16; \ |
| ((unsigned short *)(rel_addr))[3] = (val) & 0xffff; \ |
| } while (0) |
| |
| auto inline void __attribute__ ((always_inline)) |
| elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc, |
| const Elf32_Sym *sym, const struct r_found_version *version, |
| void *const reloc_addr_arg, int skip_ifunc) |
| { |
| Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| const int r_type = ELF32_R_TYPE (reloc->r_info); |
| |
| if (__builtin_expect (r_type == R_MICROBLAZE_64_PCREL, 0)) |
| PUT_REL_64 (reloc_addr, map->l_addr + reloc->r_addend); |
| else if (r_type == R_MICROBLAZE_REL) |
| *reloc_addr = map->l_addr + reloc->r_addend; |
| else |
| { |
| const Elf32_Sym *const refsym = sym; |
| struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); |
| Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value; |
| |
| value += reloc->r_addend; |
| if (r_type == R_MICROBLAZE_GLOB_DAT || |
| r_type == R_MICROBLAZE_JUMP_SLOT || |
| r_type == R_MICROBLAZE_32) |
| { |
| *reloc_addr = value; |
| } |
| else if (r_type == R_MICROBLAZE_COPY) |
| { |
| if (sym != NULL && (sym->st_size > refsym->st_size |
| || (sym->st_size < refsym->st_size && GLRO (dl_verbose))) ) |
| { |
| const char *strtab; |
| |
| strtab = (const void *) 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, strtab + refsym->st_name); |
| } |
| memcpy (reloc_addr_arg, (void *) value, |
| MIN (sym->st_size, refsym->st_size)); |
| } |
| else if (r_type == R_MICROBLAZE_NONE) |
| { |
| } |
| #if !defined RTLD_BOOTSTRAP |
| else if (r_type == R_MICROBLAZE_TLSDTPMOD32) |
| { |
| if (sym_map != NULL) |
| *reloc_addr = sym_map->l_tls_modid; |
| } |
| else if (r_type == R_MICROBLAZE_TLSDTPREL32) |
| { |
| if (sym != NULL) |
| *reloc_addr = sym->st_value + reloc->r_addend; |
| } |
| else if (r_type == R_MICROBLAZE_TLSTPREL32) |
| { |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr = sym->st_value + sym_map->l_tls_offset + reloc->r_addend; |
| } |
| } |
| #endif |
| else |
| { |
| _dl_reloc_bad_type (map, r_type, 0); |
| } |
| } |
| } |
| |
| auto inline void |
| elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| void *const reloc_addr_arg) |
| { |
| Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| PUT_REL_64 (reloc_addr, l_addr + reloc->r_addend); |
| } |
| |
| auto inline void |
| elf_machine_lazy_rel (struct link_map *map, |
| Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| int skip_ifunc) |
| { |
| Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); |
| if (ELF32_R_TYPE (reloc->r_info) == R_MICROBLAZE_JUMP_SLOT) |
| *reloc_addr += l_addr; |
| else |
| _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1); |
| } |
| |
| #endif /* RESOLVE_MAP. */ |