| /* Machine-dependent ELF dynamic relocation inline functions. SH version. |
| Copyright (C) 1999-2018 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 "SH" |
| |
| #include <sys/param.h> |
| #include <sysdep.h> |
| #include <assert.h> |
| |
| /* Return nonzero iff ELF header is compatible with the running host. */ |
| static inline int __attribute__ ((unused)) |
| elf_machine_matches_host (const Elf32_Ehdr *ehdr) |
| { |
| return ehdr->e_machine == EM_SH; |
| } |
| |
| |
| /* 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 __attribute__ ((unused)) |
| elf_machine_dynamic (void) |
| { |
| register Elf32_Addr *got; |
| asm ("mov r12,%0" :"=r" (got)); |
| return *got; |
| } |
| |
| |
| /* Return the run-time load address of the shared object. */ |
| static inline Elf32_Addr __attribute__ ((unused)) |
| elf_machine_load_address (void) |
| { |
| Elf32_Addr addr; |
| asm ("mov.l 1f,r0\n\ |
| mov.l 3f,r2\n\ |
| add r12,r2\n\ |
| mov.l @(r0,r12),r0\n\ |
| bra 2f\n\ |
| sub r0,r2\n\ |
| .align 2\n\ |
| 1: .long _dl_start@GOT\n\ |
| 3: .long _dl_start@GOTOFF\n\ |
| 2: mov r2,%0" |
| : "=r" (addr) : : "r0", "r1", "r2"); |
| return addr; |
| } |
| |
| |
| /* 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__ ((unused, always_inline)) |
| elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) |
| { |
| Elf32_Addr *got; |
| extern void _dl_runtime_resolve (Elf32_Word); |
| extern void _dl_runtime_profile (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 an |
| offset into the .rela.plt section and _GLOBAL_OFFSET_TABLE_[1], |
| and then jump to _GLOBAL_OFFSET_TABLE[2]. */ |
| got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); |
| /* If a library is prelinked but we have to relocate anyway, |
| we have to be able to undo the prelinking of .got.plt. |
| The prelinker saved us here address of .plt + 36. */ |
| if (got[1]) |
| { |
| l->l_mach.plt = got[1] + l->l_addr; |
| l->l_mach.gotplt = (Elf32_Addr) &got[3]; |
| } |
| got[1] = (Elf32_Addr) l; /* Identify this shared object. */ |
| |
| /* The got[2] entry contains the address of a function which gets |
| called to get the address of a so far unresolved function and |
| jump to it. The profiling extension of the dynamic linker allows |
| to intercept the calls to collect information. In this case we |
| don't store the address in the GOT so that all future calls also |
| end in this function. */ |
| if (profile) |
| { |
| got[2] = (Elf32_Addr) &_dl_runtime_profile; |
| /* Say that we really want profiling and the timers are started. */ |
| if (GLRO(dl_profile) != NULL |
| && _dl_name_match_p (GLRO(dl_profile), l)) |
| GL(dl_profile_map) = l; |
| } |
| else |
| /* 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; |
| } |
| |
| #define ELF_MACHINE_RUNTIME_FIXUP_ARGS int plt_type |
| #define ELF_MACHINE_RUNTIME_FIXUP_PARAMS plt_type |
| |
| /* 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\ |
| .globl _dl_start_user\n\ |
| _start:\n\ |
| mov r15,r4\n\ |
| mov.l .L_dl_start,r1\n\ |
| mova .L_dl_start,r0\n\ |
| add r1,r0\n\ |
| jsr @r0\n\ |
| nop\n\ |
| _dl_start_user:\n\ |
| ! Save the user entry point address in r8.\n\ |
| mov r0,r8\n\ |
| ! Point r12 at the GOT.\n\ |
| mov.l 1f,r12\n\ |
| mova 1f,r0\n\ |
| bra 2f\n\ |
| add r0,r12\n\ |
| .align 2\n\ |
| 1: .long _GLOBAL_OFFSET_TABLE_\n\ |
| 2: ! See if we were run as a command with the executable file\n\ |
| ! name as an extra leading argument.\n\ |
| mov.l .L_dl_skip_args,r0\n\ |
| mov.l @(r0,r12),r0\n\ |
| mov.l @r0,r0\n\ |
| ! Get the original argument count.\n\ |
| mov.l @r15,r5\n\ |
| ! Subtract _dl_skip_args from it.\n\ |
| sub r0,r5\n\ |
| ! Adjust the stack pointer to skip _dl_skip_args words.\n\ |
| shll2 r0\n\ |
| add r0,r15\n\ |
| ! Store back the modified argument count.\n\ |
| mov.l r5,@r15\n\ |
| ! Compute argv address and envp.\n\ |
| mov r15,r6\n\ |
| add #4,r6\n\ |
| mov r5,r7\n\ |
| shll2 r7\n\ |
| add r15,r7\n\ |
| add #8,r7\n\ |
| mov.l .L_dl_loaded,r0\n\ |
| mov.l @(r0,r12),r0\n\ |
| mov.l @r0,r4\n\ |
| ! Call _dl_init.\n\ |
| mov.l .L_dl_init,r1\n\ |
| mova .L_dl_init,r0\n\ |
| add r1,r0\n\ |
| jsr @r0\n\ |
| nop\n\ |
| 1: ! Pass our finalizer function to the user in r4, as per ELF ABI.\n\ |
| mov.l .L_dl_fini,r0\n\ |
| mov.l @(r0,r12),r4\n\ |
| ! Jump to the user's entry point.\n\ |
| jmp @r8\n\ |
| nop\n\ |
| .align 2\n\ |
| .L_dl_start:\n\ |
| .long _dl_start@PLT\n\ |
| .L_dl_skip_args:\n\ |
| .long _dl_skip_args@GOT\n\ |
| .L_dl_init:\n\ |
| .long _dl_init@PLT\n\ |
| .L_dl_loaded:\n\ |
| .long _rtld_local@GOT\n\ |
| .L_dl_fini:\n\ |
| .long _dl_fini@GOT\n\ |
| .type __fpscr_values,@object\n\ |
| .global __fpscr_values\n\ |
| __fpscr_values:\n\ |
| .long 0\n\ |
| .long 0x80000\n\ |
| .weak __fpscr_values\n\ |
| .previous\n\ |
| "); |
| |
| /* 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. */ |
| #define elf_machine_type_class(type) \ |
| ((((type) == R_SH_JMP_SLOT || (type) == R_SH_TLS_DTPMOD32 \ |
| || (type) == R_SH_TLS_DTPOFF32 || (type) == R_SH_TLS_TPOFF32) \ |
| * ELF_RTYPE_CLASS_PLT) \ |
| | (((type) == R_SH_COPY) * ELF_RTYPE_CLASS_COPY)) |
| |
| /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ |
| #define ELF_MACHINE_JMP_SLOT R_SH_JMP_SLOT |
| |
| /* We define an initialization functions. This is called very early in |
| _dl_sysdep_start. */ |
| #define DL_PLATFORM_INIT dl_platform_init () |
| |
| static inline void __attribute__ ((unused)) |
| dl_platform_init (void) |
| { |
| if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') |
| /* Avoid an empty string which would disturb us. */ |
| GLRO(dl_platform) = NULL; |
| } |
| |
| 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. */ |
| static inline Elf32_Addr |
| elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, |
| Elf32_Addr value) |
| { |
| return value + reloc->r_addend; |
| } |
| |
| #define ARCH_LA_PLTENTER sh_gnu_pltenter |
| #define ARCH_LA_PLTEXIT sh_gnu_pltexit |
| |
| #endif /* !dl_machine_h */ |
| |
| /* SH never uses Elf32_Rel relocations. */ |
| #define ELF_MACHINE_NO_REL 1 |
| #define ELF_MACHINE_NO_RELA 0 |
| |
| #ifdef RESOLVE_MAP |
| |
| /* Perform the relocation specified by RELOC and SYM (which is fully resolved). |
| MAP is the object containing the reloc. */ |
| |
| 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 unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| Elf32_Addr value; |
| |
| #define COPY_UNALIGNED_WORD(swp, twp, align) \ |
| { \ |
| void *__s = (swp), *__t = (twp); \ |
| unsigned char *__s1 = __s, *__t1 = __t; \ |
| unsigned short *__s2 = __s, *__t2 = __t; \ |
| unsigned long *__s4 = __s, *__t4 = __t; \ |
| switch ((align)) \ |
| { \ |
| case 0: \ |
| *__t4 = *__s4; \ |
| break; \ |
| case 2: \ |
| *__t2++ = *__s2++; \ |
| *__t2 = *__s2; \ |
| break; \ |
| default: \ |
| *__t1++ = *__s1++; \ |
| *__t1++ = *__s1++; \ |
| *__t1++ = *__s1++; \ |
| *__t1 = *__s1; \ |
| break; \ |
| } \ |
| } |
| |
| if (__glibc_unlikely (r_type == R_SH_RELATIVE)) |
| { |
| #ifndef RTLD_BOOTSTRAP |
| if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */ |
| #endif |
| { |
| if (reloc->r_addend) |
| value = map->l_addr + reloc->r_addend; |
| else |
| { |
| COPY_UNALIGNED_WORD (reloc_addr_arg, &value, |
| (int) reloc_addr_arg & 3); |
| value += map->l_addr; |
| } |
| COPY_UNALIGNED_WORD (&value, reloc_addr_arg, |
| (int) reloc_addr_arg & 3); |
| } |
| } |
| #ifndef RTLD_BOOTSTRAP |
| else if (__glibc_unlikely (r_type == R_SH_NONE)) |
| return; |
| #endif |
| else |
| { |
| const Elf32_Sym *const refsym = sym; |
| struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); |
| |
| value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value; |
| value += reloc->r_addend; |
| |
| switch (r_type) |
| { |
| case R_SH_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 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, strtab + refsym->st_name); |
| } |
| memcpy (reloc_addr_arg, (void *) value, |
| MIN (sym->st_size, refsym->st_size)); |
| break; |
| case R_SH_GLOB_DAT: |
| case R_SH_JMP_SLOT: |
| /* These addresses are always aligned. */ |
| *reloc_addr = value; |
| break; |
| /* XXX Remove TLS relocations which are not needed. */ |
| case R_SH_TLS_DTPMOD32: |
| #ifdef RTLD_BOOTSTRAP |
| /* During startup the dynamic linker is always the module |
| with index 1. |
| XXX If this relocation is necessary move before RESOLVE |
| call. */ |
| *reloc_addr = 1; |
| #else |
| /* Get the information from the link map returned by the |
| resolv function. */ |
| if (sym_map != NULL) |
| *reloc_addr = sym_map->l_tls_modid; |
| #endif |
| break; |
| case R_SH_TLS_DTPOFF32: |
| #ifndef RTLD_BOOTSTRAP |
| /* During relocation all TLS symbols are defined and used. |
| Therefore the offset is already correct. */ |
| if (sym != NULL) |
| *reloc_addr = sym->st_value; |
| #endif |
| break; |
| case R_SH_TLS_TPOFF32: |
| /* The offset is positive, afterward from the thread pointer. */ |
| #ifdef RTLD_BOOTSTRAP |
| *reloc_addr = map->l_tls_offset + sym->st_value + reloc->r_addend; |
| #else |
| /* We know the offset of object the symbol is contained in. |
| It is a positive value which will be added to the thread |
| pointer. To get the variable position in the TLS block |
| we add the offset from that of the TLS block. */ |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr = sym_map->l_tls_offset + sym->st_value |
| + reloc->r_addend; |
| } |
| #endif |
| break; |
| case R_SH_DIR32: |
| { |
| #if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP |
| /* This is defined in rtld.c, but nowhere in the static |
| libc.a; make the reference weak so static programs can |
| still link. This declaration cannot be done when |
| compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) because |
| rtld.c contains the common defn for _dl_rtld_map, which |
| is incompatible with a weak decl in the same file. */ |
| # ifndef SHARED |
| weak_extern (_dl_rtld_map); |
| # endif |
| if (map == &GL(dl_rtld_map)) |
| /* Undo the relocation done here during bootstrapping. |
| Now we will relocate it anew, possibly using a |
| binding found in the user program or a loaded library |
| rather than the dynamic linker's built-in definitions |
| used while loading those libraries. */ |
| value -= map->l_addr + refsym->st_value + reloc->r_addend; |
| #endif |
| COPY_UNALIGNED_WORD (&value, reloc_addr_arg, |
| (int) reloc_addr_arg & 3); |
| break; |
| } |
| case R_SH_REL32: |
| value = (value - (Elf32_Addr) reloc_addr); |
| COPY_UNALIGNED_WORD (&value, reloc_addr_arg, |
| (int) reloc_addr_arg & 3); |
| break; |
| default: |
| _dl_reloc_bad_type (map, r_type, 0); |
| break; |
| } |
| } |
| } |
| |
| auto inline void |
| __attribute__ ((always_inline)) |
| elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| void *const reloc_addr_arg) |
| { |
| Elf32_Addr value; |
| |
| if (reloc->r_addend) |
| value = l_addr + reloc->r_addend; |
| else |
| { |
| COPY_UNALIGNED_WORD (reloc_addr_arg, &value, (int) reloc_addr_arg & 3); |
| value += l_addr; |
| } |
| COPY_UNALIGNED_WORD (&value, reloc_addr_arg, (int) reloc_addr_arg & 3); |
| |
| #undef COPY_UNALIGNED_WORD |
| } |
| |
| auto inline void |
| __attribute__ ((always_inline)) |
| 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); |
| /* Check for unexpected PLT reloc type. */ |
| if (ELF32_R_TYPE (reloc->r_info) == R_SH_JMP_SLOT) |
| { |
| if (__builtin_expect (map->l_mach.plt, 0) == 0) |
| *reloc_addr += l_addr; |
| else |
| *reloc_addr = |
| map->l_mach.plt |
| + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 7; |
| } |
| else |
| _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1); |
| } |
| |
| #endif /* RESOLVE_MAP */ |