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Diffstat (limited to 'newlib/libc/sys/linux/machine/i386/dl-machine.h')
| -rw-r--r-- | newlib/libc/sys/linux/machine/i386/dl-machine.h | 403 |
1 files changed, 0 insertions, 403 deletions
diff --git a/newlib/libc/sys/linux/machine/i386/dl-machine.h b/newlib/libc/sys/linux/machine/i386/dl-machine.h deleted file mode 100644 index 032713e5b..000000000 --- a/newlib/libc/sys/linux/machine/i386/dl-machine.h +++ /dev/null @@ -1,403 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. i386 version. - Copyright (C) 1995,96,97,98,99,2000,2001 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef dl_machine_h -#define dl_machine_h - -#define ELF_MACHINE_NAME "i386" - -#include <sys/param.h> -#include <machine/weakalias.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_386; -} - - -/* 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 ("%ebx"); - 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 ("leal _dl_start@GOTOFF(%%ebx), %0\n" - "subl _dl_start@GOT(%%ebx), %0" - : "=r" (addr) : : "cc"); - return addr; -} - -#if !defined PROF && !__BOUNDED_POINTERS__ -/* 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. */ -/* GKM FIXME: Fix trampoline to pass bounds so we can do - without the `__unbounded' qualifier. */ -static ElfW(Addr) fixup (struct link_map *__unbounded l, ElfW(Word) reloc_offset) - __attribute__ ((regparm (2), unused)); -static ElfW(Addr) profile_fixup (struct link_map *l, ElfW(Word) reloc_offset, - ElfW(Addr) retaddr) - __attribute__ ((regparm (3), unused)); -#endif - -/* 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)) -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 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]); - 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 (__builtin_expect (profile, 0)) - { - got[2] = (Elf32_Addr) &_dl_runtime_profile; - - if (_dl_name_match_p (_dl_profile, l)) - /* This is the object we are looking for. Say that we really - want profiling and the timers are started. */ - _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; -} - -/* This code is used in dl-runtime.c to call the `fixup' function - and then redirect to the address it returns. */ -#if !defined PROF && !__BOUNDED_POINTERS__ -# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\ - .text\n\ - .globl _dl_runtime_resolve\n\ - .type _dl_runtime_resolve, @function\n\ - .align 16\n\ -_dl_runtime_resolve:\n\ - pushl %eax # Preserve registers otherwise clobbered.\n\ - pushl %ecx\n\ - pushl %edx\n\ - movl 16(%esp), %edx # Copy args pushed by PLT in register. Note\n\ - movl 12(%esp), %eax # that `fixup' takes its parameters in regs.\n\ - call fixup # Call resolver.\n\ - popl %edx # Get register content back.\n\ - popl %ecx\n\ - xchgl %eax, (%esp) # Get %eax contents end store function address.\n\ - ret $8 # Jump to function address.\n\ - .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\ -\n\ - .globl _dl_runtime_profile\n\ - .type _dl_runtime_profile, @function\n\ - .align 16\n\ -_dl_runtime_profile:\n\ - pushl %eax # Preserve registers otherwise clobbered.\n\ - pushl %ecx\n\ - pushl %edx\n\ - movl 20(%esp), %ecx # Load return address\n\ - movl 16(%esp), %edx # Copy args pushed by PLT in register. Note\n\ - movl 12(%esp), %eax # that `fixup' takes its parameters in regs.\n\ - call profile_fixup # Call resolver.\n\ - popl %edx # Get register content back.\n\ - popl %ecx\n\ - xchgl %eax, (%esp) # Get %eax contents end store function address.\n\ - ret $8 # Jump to function address.\n\ - .size _dl_runtime_profile, .-_dl_runtime_profile\n\ - .previous\n\ -"); -#else -# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\ - .text\n\ - .globl _dl_runtime_resolve\n\ - .globl _dl_runtime_profile\n\ - .type _dl_runtime_resolve, @function\n\ - .type _dl_runtime_profile, @function\n\ - .align 16\n\ -_dl_runtime_resolve:\n\ -_dl_runtime_profile:\n\ - pushl %eax # Preserve registers otherwise clobbered.\n\ - pushl %ecx\n\ - pushl %edx\n\ - movl 16(%esp), %edx # Push the arguments for `fixup'\n\ - movl 12(%esp), %eax\n\ - pushl %edx\n\ - pushl %eax\n\ - call fixup # Call resolver.\n\ - popl %edx # Pop the parameters\n\ - popl %ecx\n\ - popl %edx # Get register content back.\n\ - popl %ecx\n\ - xchgl %eax, (%esp) # Get %eax contents end store function address.\n\ - ret $8 # Jump to function address.\n\ - .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\ - .size _dl_runtime_profile, .-_dl_runtime_profile\n\ - .previous\n\ -"); -#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\ - pushl %esp\n\ - call _dl_start\n\ - popl %ebx\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\ - # Store the highest stack address\n\ - movl __libc_stack_end@GOT(%ebx), %eax\n\ - movl %esp, (%eax)\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@GOT(%ebx), %eax\n\ - movl (%eax), %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 _dl_loaded@GOT(%ebx), %esi\n\ - leal 8(%esp,%edx,4), %eax\n\ - leal 4(%esp), %ecx\n\ - pushl %eax\n\ - movl (%esi), %eax\n\ - # Call the function to run the initializers.\n\ - call _dl_init@PLT\n\ - # Pass our finalizer function to the user in %edx, as per ELF ABI.\n\ - movl _dl_fini@GOT(%ebx), %edx\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, so - PLT entries should not be allowed to define the value. - ELF_RTYPE_CLASS_NOCOPY 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_386_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \ - | (((type) == R_386_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_386_JMP_SLOT - -/* The i386 never uses Elf32_Rela relocations. */ -#define ELF_MACHINE_NO_RELA 1 - -/* We define an initialization functions. This is called very early in - _dl_sysdep_start. */ -#define DL_PLATFORM_INIT dl_platform_init () - -extern const char *_dl_platform; - -static inline void __attribute__ ((unused)) -dl_platform_init (void) -{ - if (_dl_platform != NULL && *_dl_platform == '\0') - /* Avoid an empty string which would disturb us. */ - _dl_platform = NULL; -} - -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; -} - -#endif /* !dl_machine_h */ - -#ifdef RESOLVE - -/* Perform the relocation specified by RELOC and SYM (which is fully resolved). - MAP is the object containing the reloc. */ - -static inline void -elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc, - const Elf32_Sym *sym, const struct r_found_version *version, - Elf32_Addr *const reloc_addr) -{ - const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); - -#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC - if (__builtin_expect (r_type == R_386_RELATIVE, 0)) - { -# 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. */ - weak_extern (_dl_rtld_map); - if (map != &_dl_rtld_map) /* Already done in rtld itself. */ -# endif - *reloc_addr += map->l_addr; - } -# ifndef RTLD_BOOTSTRAP - else if (__builtin_expect (r_type == R_386_NONE, 0)) - return; -# endif - else -#endif - { -#ifndef RTLD_BOOTSTRAP - const Elf32_Sym *const refsym = sym; -#endif - Elf32_Addr value = RESOLVE (&sym, version, r_type); - if (sym) - value += sym->st_value; - -#ifdef RTLD_BOOTSTRAP - assert (r_type == R_386_GLOB_DAT || r_type == R_386_JMP_SLOT); - *reloc_addr = value; -#else - switch (r_type) - { - case R_386_GLOB_DAT: - case R_386_JMP_SLOT: - *reloc_addr = value; - break; - 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) - && _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", - _dl_argv[0] ?: "<program name unknown>", - strtab + refsym->st_name); - } - memcpy (reloc_addr, (void *) value, MIN (sym->st_size, - refsym->st_size)); - break; - default: - _dl_reloc_bad_type (map, r_type, 0); - break; - } -#endif - } -} - -static inline void -elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc, - Elf32_Addr *const reloc_addr) -{ - assert (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE); - *reloc_addr += l_addr; -} - -static inline void -elf_machine_lazy_rel (struct link_map *map, - Elf32_Addr l_addr, const Elf32_Rel *reloc) -{ - 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 (__builtin_expect (r_type == R_386_JMP_SLOT, 1)) - *reloc_addr += l_addr; - else - _dl_reloc_bad_type (map, r_type, 1); -} - -#endif /* RESOLVE */ |