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Update.
1998-03-04 09:43 Ulrich Drepper <drepper@cygnus.com> * elf/link.h (struct link_map): Add new field l_reloc_result. * elf/dl-reloc.c (_dl_relocate_object): Allocate array for results of relocation for the object to be profiled. * elf/dl-object.c (_dl_new_object): Initialize l_reloc_result field to NULL. * elf/rtld.c (_dl_start): Add comment that we must not allocate an array here. * elf/dl-runtime.c (profile_fixup): If l_reloc_result array already contains a result from a previous run use this instead of computing the value again. * elf/dl-minimal.c (malloc): Remove limit for size of allocation. 1998-03-04 11:32 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
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Ulrich Drepper
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16
ChangeLog
16
ChangeLog
@ -1,4 +1,18 @@
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Wed Mar 4 11:32:01 1998 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
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1998-03-04 09:43 Ulrich Drepper <drepper@cygnus.com>
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* elf/link.h (struct link_map): Add new field l_reloc_result.
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* elf/dl-reloc.c (_dl_relocate_object): Allocate array for results
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of relocation for the object to be profiled.
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* elf/dl-object.c (_dl_new_object): Initialize l_reloc_result field
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to NULL.
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* elf/rtld.c (_dl_start): Add comment that we must not allocate an
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array here.
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* elf/dl-runtime.c (profile_fixup): If l_reloc_result array already
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contains a result from a previous run use this instead of computing
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the value again.
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* elf/dl-minimal.c (malloc): Remove limit for size of allocation.
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1998-03-04 11:32 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
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* sysdeps/m68k/dl-machine.h: (elf_machine_load_address): Use word
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offsets into the GOT.
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@ -1,5 +1,5 @@
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/* Minimal replacements for basic facilities used in the dynamic linker.
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Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -27,7 +27,7 @@
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#include <errno.h>
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/* Minimal `malloc' allocator for use while loading shared libraries.
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Only small blocks are allocated, and none are ever freed. */
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No block is ever freed. */
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static void *alloc_ptr, *alloc_end, *alloc_last_block;
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@ -61,13 +61,13 @@ malloc (size_t n)
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{
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/* Insufficient space left; allocate another page. */
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caddr_t page;
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assert (n <= _dl_pagesize);
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page = __mmap (0, _dl_pagesize, PROT_READ|PROT_WRITE,
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size_t nup = (n + _dl_pagesize - 1) & ~(_dl_pagesize - 1);
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page = __mmap (0, nup, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, _dl_zerofd, 0);
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assert (page != MAP_FAILED);
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if (page != alloc_end)
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alloc_ptr = page;
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alloc_end = page + _dl_pagesize;
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alloc_end = page + nup;
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}
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alloc_last_block = (void *) alloc_ptr;
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@ -1,5 +1,5 @@
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/* Storage management for the chain of loaded shared objects.
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Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -45,6 +45,7 @@ _dl_new_object (char *realname, const char *libname, int type)
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new->l_libname = newname;
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new->l_type = type;
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new->l_rpath_dirs = NULL;
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new->l_reloc_result = NULL;
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if (_dl_loaded == NULL)
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{
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@ -1,5 +1,5 @@
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/* Relocate a shared object and resolve its references to other loaded objects.
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Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -17,11 +17,12 @@
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <link.h>
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <errno.h>
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#include <link.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include "dynamic-link.h"
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@ -67,6 +68,18 @@ _dl_relocate_object (struct link_map *l, struct link_map *scope[], int lazy)
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#include "dynamic-link.h"
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ELF_DYNAMIC_RELOCATE (l, lazy, 1);
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if (_dl_profile_map == l)
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{
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/* Allocate the array which will contain the already found
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relocations. */
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l->l_reloc_result =
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(ElfW(Addr) *) calloc (sizeof (ElfW(Addr)),
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l->l_info[DT_PLTRELSZ]->d_un.d_val);
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if (l->l_reloc_result == NULL)
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_dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
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"cannot allocate memory for profiling", NULL);
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}
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}
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/* Mark the object so we know this work has been done. */
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@ -1,5 +1,5 @@
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/* On-demand PLT fixup for shared objects.
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Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -162,55 +162,70 @@ profile_fixup (
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struct link_map *l, ElfW(Word) reloc_offset, ElfW(Addr) retaddr)
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{
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void (*mcount_fct) (ElfW(Addr), ElfW(Addr)) = _dl_mcount;
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const ElfW(Sym) *const symtab
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= (const ElfW(Sym) *) (l->l_addr + l->l_info[DT_SYMTAB]->d_un.d_ptr);
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const char *strtab =
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(const char *) (l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
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const PLTREL *const reloc
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= (const void *) (l->l_addr + l->l_info[DT_JMPREL]->d_un.d_ptr +
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reloc_offset);
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const ElfW(Sym) *sym = &symtab[ELFW(R_SYM) (reloc->r_info)];
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ElfW(Addr) *resultp;
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ElfW(Addr) value;
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/* Set up the scope to find symbols referenced by this object. */
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struct link_map **scope = _dl_object_relocation_scope (l);
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/* This is the address in the array where we store the result of previous
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relocations. */
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resultp = &l->l_reloc_result[reloc_offset / sizeof (PLTREL)];
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/* Sanity check that we're really looking at a PLT relocation. */
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assert (ELFW(R_TYPE)(reloc->r_info) == ELF_MACHINE_JMP_SLOT);
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/* Look up the target symbol. */
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switch (l->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
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value = *resultp;
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if (value == 0)
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{
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default:
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{
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const ElfW(Half) *vernum = (const ElfW(Half) *)
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(l->l_addr + l->l_info[VERSYMIDX (DT_VERSYM)]->d_un.d_ptr);
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ElfW(Half) ndx = vernum[ELFW(R_SYM) (reloc->r_info)];
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const struct r_found_version *version = &l->l_versions[ndx];
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/* This is the first time we have to relocate this object. */
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const ElfW(Sym) *const symtab
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= (const ElfW(Sym) *) (l->l_addr + l->l_info[DT_SYMTAB]->d_un.d_ptr);
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const char *strtab =
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(const char *) (l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
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if (version->hash != 0)
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const PLTREL *const reloc
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= (const void *) (l->l_addr + l->l_info[DT_JMPREL]->d_un.d_ptr +
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reloc_offset);
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const ElfW(Sym) *sym = &symtab[ELFW(R_SYM) (reloc->r_info)];
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/* Set up the scope to find symbols referenced by this object. */
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struct link_map **scope = _dl_object_relocation_scope (l);
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/* Sanity check that we're really looking at a PLT relocation. */
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assert (ELFW(R_TYPE)(reloc->r_info) == ELF_MACHINE_JMP_SLOT);
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/* Look up the target symbol. */
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switch (l->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
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{
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default:
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{
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value = _dl_lookup_versioned_symbol(strtab + sym->st_name,
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&sym, scope, l->l_name,
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version, ELF_MACHINE_JMP_SLOT);
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break;
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const ElfW(Half) *vernum = (const ElfW(Half) *)
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(l->l_addr + l->l_info[VERSYMIDX (DT_VERSYM)]->d_un.d_ptr);
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ElfW(Half) ndx = vernum[ELFW(R_SYM) (reloc->r_info)];
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const struct r_found_version *version = &l->l_versions[ndx];
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if (version->hash != 0)
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{
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value = _dl_lookup_versioned_symbol(strtab + sym->st_name,
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&sym, scope, l->l_name,
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version,
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ELF_MACHINE_JMP_SLOT);
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break;
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}
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}
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}
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case 0:
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value = _dl_lookup_symbol (strtab + sym->st_name, &sym, scope,
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l->l_name, ELF_MACHINE_JMP_SLOT);
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case 0:
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value = _dl_lookup_symbol (strtab + sym->st_name, &sym, scope,
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l->l_name, ELF_MACHINE_JMP_SLOT);
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}
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/* Currently value contains the base load address of the object
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that defines sym. Now add in the symbol offset. */
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value = (sym ? value + sym->st_value : 0);
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/* And now perhaps the relocation addend. */
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value = elf_machine_plt_value (l, reloc, value);
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*_dl_global_scope_end = NULL;
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/* Store the result for later runs. */
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*resultp = value;
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}
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/* Currently value contains the base load address of the object
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that defines sym. Now add in the symbol offset. */
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value = (sym ? value + sym->st_value : 0);
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/* And now perhaps the relocation addend. */
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value = elf_machine_plt_value (l, reloc, value);
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*_dl_global_scope_end = NULL;
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(*mcount_fct) (retaddr, value);
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return value;
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@ -114,6 +114,9 @@ _dl_start (void *arg)
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data access using the global offset table. */
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ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0);
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/* Please note that we don't allow profiling of this object and
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therefore need not test whether we have to allocate the array
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for the relocation results (as done in dl-reloc.c). */
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/* Now life is sane; we can call functions and access global data.
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Set up to use the operating system facilities, and find out from
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