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Diffstat (limited to 'REORG.TODO/sysdeps/i386/dl-machine.h')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/dl-machine.h | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/dl-machine.h b/REORG.TODO/sysdeps/i386/dl-machine.h new file mode 100644 index 0000000000..57d4a0bdbd --- /dev/null +++ b/REORG.TODO/sysdeps/i386/dl-machine.h @@ -0,0 +1,757 @@ +/* Machine-dependent ELF dynamic relocation inline functions. i386 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 "i386" + +#include <sys/param.h> +#include <sysdep.h> +#include <tls.h> +#include <dl-tlsdesc.h> +#include <cpu-features.c> + +/* 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_386; +} + + +/* Return the link-time address of _DYNAMIC. Conveniently, this is the + first element of the GOT, a special entry that is never relocated. */ +static inline Elf32_Addr __attribute__ ((unused, const)) +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. */ + extern const Elf32_Addr _GLOBAL_OFFSET_TABLE_[] attribute_hidden; + return _GLOBAL_OFFSET_TABLE_[0]; +} + +/* Return the run-time load address of the shared object. */ +static inline Elf32_Addr __attribute__ ((unused)) +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. */ + extern Elf32_Dyn bygotoff[] asm ("_DYNAMIC") attribute_hidden; + return (Elf32_Addr) &bygotoff - 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__ ((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) attribute_hidden; + extern void _dl_runtime_profile (Elf32_Word) attribute_hidden; + + 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 push an + offset into the .rel.plt section, push _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 + 0x16. */ + 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 (__glibc_unlikely (profile)) + { + got[2] = (Elf32_Addr) &_dl_runtime_profile; + + if (GLRO(dl_profile) != NULL + && _dl_name_match_p (GLRO(dl_profile), l)) + /* This is the object we are looking for. Say that we really + want profiling and the timers are started. */ + 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; +} + +#ifdef IN_DL_RUNTIME + +# ifndef PROF +/* We add a declaration of this function here so that in dl-runtime.c + the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters + in registers. + + We cannot use this scheme for profiling because the _mcount call + destroys the passed register information. */ +#define ARCH_FIXUP_ATTRIBUTE __attribute__ ((regparm (3), stdcall, unused)) + +extern ElfW(Addr) _dl_fixup (struct link_map *l, + ElfW(Word) reloc_offset) + ARCH_FIXUP_ATTRIBUTE; +extern ElfW(Addr) _dl_profile_fixup (struct link_map *l, + ElfW(Word) reloc_offset, + ElfW(Addr) retaddr, void *regs, + long int *framesizep) + ARCH_FIXUP_ATTRIBUTE; +# endif + +#endif + +/* Mask identifying addresses reserved for the user program, + where the dynamic linker should not map anything. */ +#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL + +/* 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 ("\n\ + .text\n\ + .align 16\n\ +0: movl (%esp), %ebx\n\ + ret\n\ + .align 16\n\ +.globl _start\n\ +.globl _dl_start_user\n\ +_start:\n\ + # Note that _dl_start gets the parameter in %eax.\n\ + movl %esp, %eax\n\ + call _dl_start\n\ +_dl_start_user:\n\ + # Save the user entry point address in %edi.\n\ + movl %eax, %edi\n\ + # Point %ebx at the GOT.\n\ + call 0b\n\ + addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\ + # See if we were run as a command with the executable file\n\ + # name as an extra leading argument.\n\ + movl _dl_skip_args@GOTOFF(%ebx), %eax\n\ + # Pop the original argument count.\n\ + popl %edx\n\ + # Adjust the stack pointer to skip _dl_skip_args words.\n\ + leal (%esp,%eax,4), %esp\n\ + # Subtract _dl_skip_args from argc.\n\ + subl %eax, %edx\n\ + # Push argc back on the stack.\n\ + push %edx\n\ + # The special initializer gets called with the stack just\n\ + # as the application's entry point will see it; it can\n\ + # switch stacks if it moves these contents over.\n\ +" RTLD_START_SPECIAL_INIT "\n\ + # Load the parameters again.\n\ + # (eax, edx, ecx, *--esp) = (_dl_loaded, argc, argv, envp)\n\ + movl _rtld_local@GOTOFF(%ebx), %eax\n\ + leal 8(%esp,%edx,4), %esi\n\ + leal 4(%esp), %ecx\n\ + movl %esp, %ebp\n\ + # Make sure _dl_init is run with 16 byte aligned stack.\n\ + andl $-16, %esp\n\ + pushl %eax\n\ + pushl %eax\n\ + pushl %ebp\n\ + pushl %esi\n\ + # Clear %ebp, so that even constructors have terminated backchain.\n\ + xorl %ebp, %ebp\n\ + # Call the function to run the initializers.\n\ + call _dl_init\n\ + # Pass our finalizer function to the user in %edx, as per ELF ABI.\n\ + leal _dl_fini@GOTOFF(%ebx), %edx\n\ + # Restore %esp _start expects.\n\ + movl (%esp), %esp\n\ + # Jump to the user's entry point.\n\ + jmp *%edi\n\ + .previous\n\ +"); + +#ifndef RTLD_START_SPECIAL_INIT +# define RTLD_START_SPECIAL_INIT /* nothing */ +#endif + +/* 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. + ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA iff TYPE describes relocation may + against protected data whose address be external due to copy relocation. + */ +# define elf_machine_type_class(type) \ + ((((type) == R_386_JMP_SLOT || (type) == R_386_TLS_DTPMOD32 \ + || (type) == R_386_TLS_DTPOFF32 || (type) == R_386_TLS_TPOFF32 \ + || (type) == R_386_TLS_TPOFF || (type) == R_386_TLS_DESC) \ + * ELF_RTYPE_CLASS_PLT) \ + | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY) \ + | (((type) == R_386_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_386_JMP_SLOT + +/* The i386 never uses Elf32_Rela relocations for the dynamic linker. + Prelinked libraries may use Elf32_Rela though. */ +#define ELF_MACHINE_PLT_REL 1 + +/* 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 IS_IN (rtld) + /* init_cpu_features has been called early from __libc_start_main in + static executable. */ + init_cpu_features (&GLRO(dl_x86_cpu_features)); +#else + if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') + /* Avoid an empty string which would disturb us. */ + GLRO(dl_platform) = NULL; +#endif +} + +static inline Elf32_Addr +elf_machine_fixup_plt (struct link_map *map, lookup_t t, + const Elf32_Rel *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_Rel *reloc, + Elf32_Addr value) +{ + return value; +} + + +/* Names of the architecture-specific auditing callback functions. */ +#define ARCH_LA_PLTENTER i86_gnu_pltenter +#define ARCH_LA_PLTEXIT i86_gnu_pltexit + +#endif /* !dl_machine_h */ + +/* The i386 never uses Elf32_Rela relocations for the dynamic linker. + Prelinked libraries may use Elf32_Rela though. */ +#define ELF_MACHINE_NO_RELA defined RTLD_BOOTSTRAP +#define ELF_MACHINE_NO_REL 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_rel (struct link_map *map, const Elf32_Rel *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); + +# if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC + if (__glibc_unlikely (r_type == R_386_RELATIVE)) + { +# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC + /* 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)) /* Already done in rtld itself. */ +# endif + *reloc_addr += map->l_addr; + } +# ifndef RTLD_BOOTSTRAP + else if (__glibc_unlikely (r_type == R_386_NONE)) + return; +# endif + else +# endif /* !RTLD_BOOTSTRAP and have no -z combreloc */ + { +# ifndef RTLD_BOOTSTRAP + const Elf32_Sym *const refsym = sym; +# endif + struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); + Elf32_Addr value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value; + + if (sym != NULL + && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, + 0) + && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) + && __builtin_expect (!skip_ifunc, 1)) + { +# ifndef RTLD_BOOTSTRAP + if (sym_map != map + && sym_map->l_type != lt_executable + && !sym_map->l_relocated) + { + const char *strtab + = (const char *) D_PTR (map, l_info[DT_STRTAB]); + _dl_error_printf ("\ +%s: Relink `%s' with `%s' for IFUNC symbol `%s'\n", + RTLD_PROGNAME, map->l_name, + sym_map->l_name, + strtab + refsym->st_name); + } +# endif + value = ((Elf32_Addr (*) (void)) value) (); + } + + switch (r_type) + { +# ifndef RTLD_BOOTSTRAP + case R_386_SIZE32: + /* Set to symbol size plus addend. */ + *reloc_addr += sym->st_size; + break; +# endif + case R_386_GLOB_DAT: + case R_386_JMP_SLOT: + *reloc_addr = value; + break; + + case R_386_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_386_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_386_TLS_DESC: + { + struct tlsdesc volatile *td = + (struct tlsdesc volatile *)reloc_addr; + +# ifndef RTLD_BOOTSTRAP + if (! sym) + td->entry = _dl_tlsdesc_undefweak; + else +# endif + { +# ifndef RTLD_BOOTSTRAP +# ifndef SHARED + CHECK_STATIC_TLS (map, sym_map); +# else + if (!TRY_STATIC_TLS (map, sym_map)) + { + td->arg = _dl_make_tlsdesc_dynamic + (sym_map, sym->st_value + (ElfW(Word))td->arg); + td->entry = _dl_tlsdesc_dynamic; + } + else +# endif +# endif + { + td->arg = (void*)(sym->st_value - sym_map->l_tls_offset + + (ElfW(Word))td->arg); + td->entry = _dl_tlsdesc_return; + } + } + break; + } + case R_386_TLS_TPOFF32: + /* The offset is positive, backward from the thread pointer. */ +# ifdef RTLD_BOOTSTRAP + *reloc_addr += map->l_tls_offset - sym->st_value; +# else + /* We know the offset of object the symbol is contained in. + It is a positive value which will be subtracted from the + thread pointer. To get the variable position in the TLS + block we subtract 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; + } +# endif + break; + case R_386_TLS_TPOFF: + /* The offset is negative, forward from the thread pointer. */ +# ifdef RTLD_BOOTSTRAP + *reloc_addr += sym->st_value - map->l_tls_offset; +# else + /* We know the offset of object the symbol is contained in. + It is a negative value which will be added to the + thread pointer. */ + if (sym != NULL) + { + CHECK_STATIC_TLS (map, sym_map); + *reloc_addr += sym->st_value - sym_map->l_tls_offset; + } +# endif + break; + +# ifndef RTLD_BOOTSTRAP + case R_386_32: + *reloc_addr += value; + break; + case R_386_PC32: + *reloc_addr += (value - (Elf32_Addr) reloc_addr); + break; + case R_386_COPY: + if (sym == NULL) + /* This can happen in trace mode if an object could not be + found. */ + break; + if (__builtin_expect (sym->st_size > refsym->st_size, 0) + || (__builtin_expect (sym->st_size < refsym->st_size, 0) + && 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_386_IRELATIVE: + value = map->l_addr + *reloc_addr; + value = ((Elf32_Addr (*) (void)) value) (); + *reloc_addr = value; + break; + default: + _dl_reloc_bad_type (map, r_type, 0); + break; +# endif /* !RTLD_BOOTSTRAP */ + } + } +} + +# ifndef RTLD_BOOTSTRAP +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); + + if (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE) + *reloc_addr = map->l_addr + reloc->r_addend; + else if (r_type != R_386_NONE) + { +# ifndef RESOLVE_CONFLICT_FIND_MAP + const Elf32_Sym *const refsym = sym; +# endif + struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); + Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value; + + if (sym != NULL + && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) + && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) + && __builtin_expect (!skip_ifunc, 1)) + value = ((Elf32_Addr (*) (void)) value) (); + + switch (ELF32_R_TYPE (reloc->r_info)) + { + case R_386_SIZE32: + /* Set to symbol size plus addend. */ + value = sym->st_size; + case R_386_GLOB_DAT: + case R_386_JMP_SLOT: + case R_386_32: + *reloc_addr = value + reloc->r_addend; + break; +# ifndef RESOLVE_CONFLICT_FIND_MAP + /* Not needed for dl-conflict.c. */ + case R_386_PC32: + *reloc_addr = (value + reloc->r_addend - (Elf32_Addr) reloc_addr); + break; + + case R_386_TLS_DTPMOD32: + /* 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_386_TLS_DTPOFF32: + /* During relocation all TLS symbols are defined and used. + Therefore the offset is already correct. */ + *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend; + break; + case R_386_TLS_DESC: + { + struct tlsdesc volatile *td = + (struct tlsdesc volatile *)reloc_addr; + +# ifndef RTLD_BOOTSTRAP + if (!sym) + { + td->arg = (void*)reloc->r_addend; + td->entry = _dl_tlsdesc_undefweak; + } + else +# endif + { +# ifndef RTLD_BOOTSTRAP +# ifndef SHARED + CHECK_STATIC_TLS (map, sym_map); +# else + if (!TRY_STATIC_TLS (map, sym_map)) + { + td->arg = _dl_make_tlsdesc_dynamic + (sym_map, sym->st_value + reloc->r_addend); + td->entry = _dl_tlsdesc_dynamic; + } + else +# endif +# endif + { + td->arg = (void*)(sym->st_value - sym_map->l_tls_offset + + reloc->r_addend); + td->entry = _dl_tlsdesc_return; + } + } + } + break; + case R_386_TLS_TPOFF32: + /* The offset is positive, backward from the thread pointer. */ + /* We know the offset of object the symbol is contained in. + It is a positive value which will be subtracted from the + thread pointer. To get the variable position in the TLS + block we subtract 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; + } + break; + case R_386_TLS_TPOFF: + /* The offset is negative, forward from the thread pointer. */ + /* We know the offset of object the symbol is contained in. + It is a negative value which will be added to the + thread pointer. */ + if (sym != NULL) + { + CHECK_STATIC_TLS (map, sym_map); + *reloc_addr = sym->st_value - sym_map->l_tls_offset + + reloc->r_addend; + } + break; + case R_386_COPY: + if (sym == NULL) + /* This can happen in trace mode if an object could not be + found. */ + break; + if (__builtin_expect (sym->st_size > refsym->st_size, 0) + || (__builtin_expect (sym->st_size < refsym->st_size, 0) + && 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; +# endif /* !RESOLVE_CONFLICT_FIND_MAP */ + case R_386_IRELATIVE: + value = map->l_addr + reloc->r_addend; + value = ((Elf32_Addr (*) (void)) value) (); + *reloc_addr = value; + break; + default: + /* We add these checks in the version to relocate ld.so only + if we are still debugging. */ + _dl_reloc_bad_type (map, r_type, 0); + break; + } + } +} +# endif /* !RTLD_BOOTSTRAP */ + +auto inline void +__attribute ((always_inline)) +elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc, + void *const reloc_addr_arg) +{ + Elf32_Addr *const reloc_addr = reloc_addr_arg; + assert (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE); + *reloc_addr += l_addr; +} + +# ifndef RTLD_BOOTSTRAP +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 *const reloc_addr = reloc_addr_arg; + *reloc_addr = l_addr + reloc->r_addend; +} +# endif /* !RTLD_BOOTSTRAP */ + +auto inline void +__attribute__ ((always_inline)) +elf_machine_lazy_rel (struct link_map *map, + Elf32_Addr l_addr, const Elf32_Rel *reloc, + int skip_ifunc) +{ + Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); + const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); + /* Check for unexpected PLT reloc type. */ + if (__glibc_likely (r_type == R_386_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) * 4); + } + else if (__glibc_likely (r_type == R_386_TLS_DESC)) + { + struct tlsdesc volatile * __attribute__((__unused__)) td = + (struct tlsdesc volatile *)reloc_addr; + + /* Handle relocations that reference the local *ABS* in a simple + way, so as to preserve a potential addend. */ + if (ELF32_R_SYM (reloc->r_info) == 0) + td->entry = _dl_tlsdesc_resolve_abs_plus_addend; + /* Given a known-zero addend, we can store a pointer to the + reloc in the arg position. */ + else if (td->arg == 0) + { + td->arg = (void*)reloc; + td->entry = _dl_tlsdesc_resolve_rel; + } + else + { + /* We could handle non-*ABS* relocations with non-zero addends + by allocating dynamically an arg to hold a pointer to the + reloc, but that sounds pointless. */ + const Elf32_Rel *const r = reloc; + /* The code below was borrowed from elf_dynamic_do_rel(). */ + const ElfW(Sym) *const symtab = + (const void *) D_PTR (map, l_info[DT_SYMTAB]); + +# ifdef RTLD_BOOTSTRAP + /* The dynamic linker always uses versioning. */ + assert (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL); +# else + if (map->l_info[VERSYMIDX (DT_VERSYM)]) +# endif + { + const ElfW(Half) *const version = + (const void *) D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); + ElfW(Half) ndx = version[ELFW(R_SYM) (r->r_info)] & 0x7fff; + elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], + &map->l_versions[ndx], + (void *) (l_addr + r->r_offset), skip_ifunc); + } +# ifndef RTLD_BOOTSTRAP + else + elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], NULL, + (void *) (l_addr + r->r_offset), skip_ifunc); +# endif + } + } + else if (__glibc_unlikely (r_type == R_386_IRELATIVE)) + { + Elf32_Addr value = map->l_addr + *reloc_addr; + if (__glibc_likely (!skip_ifunc)) + value = ((Elf32_Addr (*) (void)) value) (); + *reloc_addr = value; + } + else + _dl_reloc_bad_type (map, r_type, 1); +} + +# ifndef RTLD_BOOTSTRAP + +auto inline void +__attribute__ ((always_inline)) +elf_machine_lazy_rela (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); + const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); + if (__glibc_likely (r_type == R_386_JMP_SLOT)) + ; + else if (__glibc_likely (r_type == R_386_TLS_DESC)) + { + struct tlsdesc volatile * __attribute__((__unused__)) td = + (struct tlsdesc volatile *)reloc_addr; + + td->arg = (void*)reloc; + td->entry = _dl_tlsdesc_resolve_rela; + } + else if (__glibc_unlikely (r_type == R_386_IRELATIVE)) + { + Elf32_Addr value = map->l_addr + reloc->r_addend; + if (__glibc_likely (!skip_ifunc)) + value = ((Elf32_Addr (*) (void)) value) (); + *reloc_addr = value; + } + else + _dl_reloc_bad_type (map, r_type, 1); +} + +# endif /* !RTLD_BOOTSTRAP */ + +#endif /* RESOLVE_MAP */ |