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Diffstat (limited to 'sysdeps/nios2/dl-machine.h')
| -rw-r--r-- | sysdeps/nios2/dl-machine.h | 336 |
1 files changed, 0 insertions, 336 deletions
diff --git a/sysdeps/nios2/dl-machine.h b/sysdeps/nios2/dl-machine.h deleted file mode 100644 index 8d2b18de23..0000000000 --- a/sysdeps/nios2/dl-machine.h +++ /dev/null @@ -1,336 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. Nios II version. - Copyright (C) 1995-2017 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 "nios2" - -#include <string.h> -#include <link.h> -#include <dl-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_ALTERA_NIOS2; -} - - -/* Return the link-time address of _DYNAMIC. Conveniently, this is the - first element of the GOT. */ -static inline Elf32_Addr -elf_machine_dynamic (void) -{ - Elf32_Addr *dynamic; - int tmp; - asm ("nextpc\t%0\n\t" - "1: movhi\t%1, %%hiadj(_GLOBAL_OFFSET_TABLE_ - 1b)\n\t" - "addi\t%1, %1, %%lo(_GLOBAL_OFFSET_TABLE_ - 1b)\n\t" - "add\t%0, %0, %1\n" - : "=r" (dynamic), "=r" (tmp)); - return *dynamic; -} - - -/* Return the run-time load address of the shared object. */ -static inline Elf32_Addr -elf_machine_load_address (void) -{ - Elf32_Addr result; - int tmp; - asm ("nextpc\t%0\n\t" - "1: movhi\t%1, %%hiadj(1b)\n\t" - "addi\t%1, %1, %%lo(1b)\n\t" - "sub\t%0, %0, %1\n" - : "=r" (result), "=r" (tmp)); - return result; -} - -/* 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); - - if (l->l_info[DT_JMPREL] && lazy) - { - /* The GOT entries for functions in the PLT have not yet been filled - in. Their initial contents will arrange when called to load r15 with - an offset into the .got section, load r14 with - _GLOBAL_OFFSET_TABLE_[1], and then jump to _GLOBAL_OFFSET_TABLE[2]. - */ - Elf32_Addr *got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); - got[1] = (Elf32_Addr) l; /* Identify this shared object. */ - - /* This function will get called to fix up the GOT entry indicated by - the offset on the stack, and then jump to the resolved address. */ - got[2] = (Elf32_Addr) &_dl_runtime_resolve; - } - - return lazy; -} - -/* 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\ - /* At start time, all the args are on the stack. */\n\ - mov r4, sp\n\ -\n\ - /* Start the calculation of the GOT pointer. */\n\ - nextpc r22\n\ -1: movhi r8, %hiadj(_gp_got - 1b)\n\ - addi r8, r8, %lo(_gp_got - 1b)\n\ -\n\ - /* Figure out where _dl_start will need to return to. */\n\ - movhi ra, %hiadj(2f - 1b)\n\ - addi ra, ra, %lo(2f - 1b)\n\ - add ra, ra, r22\n\ -\n\ - /* Finish the calculation of the GOT pointer. */\n\ - add r22, r22, r8\n\ -\n\ - br _dl_start\n\ -\n\ - /* Save the returned user entry point. */\n\ -2: mov r16, r2\n\ -\n\ - /* Initialize gp. */\n\ - ldw r4, %got(_rtld_local)(r22)\n\ - ldw r4, 0(r4)\n\ - ldw r8, %call(_dl_nios2_get_gp_value)(r22)\n\ - callr r8\n\ - mov gp, r2\n\ -\n\ - /* Find the number of arguments to skip. */\n\ - ldw r8, %got(_dl_skip_args)(r22)\n\ - ldw r8, 0(r8)\n\ -\n\ - /* Find the main_map from the GOT. */\n\ - ldw r4, %got(_rtld_local)(r22)\n\ - ldw r4, 0(r4)\n\ -\n\ - /* Find argc. */\n\ - ldw r5, 0(sp)\n\ - sub r5, r5, r8\n\ - stw r5, 0(sp)\n\ -\n\ - /* Find the first unskipped argument. */\n\ - slli r8, r8, 2\n\ - addi r6, sp, 4\n\ - add r9, r6, r8\n\ - mov r10, r6\n\ -\n\ - /* Shuffle argv down. */\n\ -3: ldw r11, 0(r9)\n\ - stw r11, 0(r10)\n\ - addi r9, r9, 4\n\ - addi r10, r10, 4\n\ - bne r11, zero, 3b\n\ -\n\ - /* Shuffle envp down. */\n\ - mov r7, r10\n\ -4: ldw r11, 0(r9)\n\ - stw r11, 0(r10)\n\ - addi r9, r9, 4\n\ - addi r10, r10, 4\n\ - bne r11, zero, 4b\n\ -\n\ - /* Shuffle auxv down. */\n\ -5: ldw r11, 4(r9)\n\ - stw r11, 4(r10)\n\ - ldw r11, 0(r9)\n\ - stw r11, 0(r10)\n\ - addi r9, r9, 8\n\ - addi r10, r10, 8\n\ - bne r11, zero, 5b\n\ -\n\ - /* Update _dl_argv. */\n\ - ldw r2, %got(_dl_argv)(r22)\n\ - stw r6, 0(r2)\n\ -\n\ - /* Call _dl_init through the PLT. */\n\ - ldw r8, %call(_dl_init)(r22)\n\ - callr r8\n\ -\n\ - /* Find the finalization function. */\n\ - ldw r4, %got(_dl_fini)(r22)\n\ -\n\ - /* Jump to the user's entry point. */\n\ - jmp r16\n\ -"); - -/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so - PLT entries 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. */ -#define elf_machine_type_class(type) \ - ((((type) == R_NIOS2_JUMP_SLOT \ - || (type) == R_NIOS2_TLS_DTPMOD \ - || (type) == R_NIOS2_TLS_DTPREL \ - || (type) == R_NIOS2_TLS_TPREL) * ELF_RTYPE_CLASS_PLT) \ - | (((type) == R_NIOS2_COPY) * ELF_RTYPE_CLASS_COPY) \ - | (((type) == R_NIOS2_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA)) - -/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ -#define ELF_MACHINE_JMP_SLOT R_NIOS2_JUMP_SLOT - -/* The Nios II never uses Elf32_Rel relocations. */ -#define ELF_MACHINE_NO_REL 1 -#define ELF_MACHINE_NO_RELA 0 - -/* Fixup a PLT entry to bounce directly to the function at VALUE. */ - -static inline Elf32_Addr -elf_machine_fixup_plt (struct link_map *map, lookup_t t, - const Elf32_Rela *reloc, - Elf32_Addr *reloc_addr, Elf32_Addr value) -{ - return *reloc_addr = value; -} - -/* Return the final value of a plt relocation. */ -static inline Elf32_Addr -elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, - Elf32_Addr value) -{ - return value; -} - -/* Names of the architecture-specific auditing callback functions. */ -#define ARCH_LA_PLTENTER nios2_gnu_pltenter -#define ARCH_LA_PLTEXIT nios2_gnu_pltexit - -#endif /* dl_machine_h */ - -#ifdef RESOLVE_MAP - -/* Perform the relocation specified by RELOC and SYM (which is fully resolved). - LOADADDR is the load address of the object; INFO is an array indexed - by DT_* of the .dynamic section info. */ - -auto inline void __attribute__ ((always_inline)) -elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc, - const ElfW(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 unsigned int r_type = ELF32_R_TYPE (reloc->r_info); - - if (__glibc_unlikely (r_type == R_NIOS2_RELATIVE)) - *reloc_addr = map->l_addr + reloc->r_addend; - else if (__glibc_unlikely (r_type == R_NIOS2_NONE)) - return; - 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; - - switch (r_type) - { - case R_NIOS2_COPY: - if (sym == NULL) - /* This can happen in trace mode if an object could not be - found. */ - break; - if (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 ?: "<program name unknown>", - strtab + refsym->st_name); - } - memcpy (reloc_addr_arg, (void *) value, - MIN (sym->st_size, refsym->st_size)); - break; - case R_NIOS2_GLOB_DAT: - case R_NIOS2_JUMP_SLOT: -# ifdef RTLD_BOOTSTRAP - /* Fix weak undefined references. */ - if (sym != NULL && sym->st_value == 0) - *reloc_addr = 0; - else -# endif - *reloc_addr = value; - break; -#ifndef RTLD_BOOTSTRAP - case R_NIOS2_TLS_DTPMOD: - /* Get the information from the link map returned by the - resolv function. */ - if (sym_map != NULL) - *reloc_addr = sym_map->l_tls_modid; - break; - - case R_NIOS2_TLS_DTPREL: - *reloc_addr = reloc->r_addend + TLS_DTPREL_VALUE(sym); - break; - - case R_NIOS2_TLS_TPREL: - if (sym != NULL) - { - CHECK_STATIC_TLS (map, sym_map); - *reloc_addr = reloc->r_addend + TLS_TPREL_VALUE(sym_map, sym); - } - break; -#endif - case R_NIOS2_BFD_RELOC_32: - *reloc_addr = value + reloc->r_addend; - break; - - default: - _dl_reloc_bad_type (map, r_type, 0); - break; - } - } -} - -auto inline void __attribute__((always_inline)) -elf_machine_rela_relative (ElfW(Addr) l_addr, const ElfW(Rela) *reloc, - void *const reloc_addr_arg) -{ - Elf32_Addr *const reloc_addr = reloc_addr_arg; - *reloc_addr = l_addr + reloc->r_addend; -} - -auto inline void __attribute__((always_inline)) -elf_machine_lazy_rel (struct link_map *map, - ElfW(Addr) l_addr, const ElfW(Rela) *reloc, - int skip_ifunc) -{ - Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); - if (ELF32_R_TYPE (reloc->r_info) == R_NIOS2_JUMP_SLOT) - *reloc_addr += l_addr; - else - _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1); -} - -#endif /* RESOLVE_MAP */ |