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authorRoland McGrath <roland@gnu.org>1995-05-02 06:35:55 +0000
committerRoland McGrath <roland@gnu.org>1995-05-02 06:35:55 +0000
commitd66e34cd423425c348bcc83df127dd19711b0b9a (patch)
tree97058e776d3b4fe06ef54bc4951596991652183f /sysdeps/stub
parent08162fa888913a5153d2fcdc4e1a816b57b1fe56 (diff)
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* sysdeps/mach/i386/sysdep.h (SNARF_ARGS, CALL_WITH_SP): Rewritten.
* sysdeps/i386/dl-machine.h: New file. * sysdeps/stub/dl-machine.h: New file. * sysdeps/i386/dl-runtime.c: New file. * sysdeps/stub/dl-runtime.c: New file. * sysdeps/i386/elf/start.S: New file. * sysdeps/generic/dl-sysdep.c: New file. * sysdeps/mach/hurd/dl-sysdep.c: New file.
Diffstat (limited to 'sysdeps/stub')
-rw-r--r--sysdeps/stub/dl-machine.h115
-rw-r--r--sysdeps/stub/dl-runtime.c64
2 files changed, 179 insertions, 0 deletions
diff --git a/sysdeps/stub/dl-machine.h b/sysdeps/stub/dl-machine.h
new file mode 100644
index 0000000..d922723
--- /dev/null
+++ b/sysdeps/stub/dl-machine.h
@@ -0,0 +1,115 @@
+/* Machine-dependent ELF dynamic relocation inline functions. Stub version.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#define ELF_MACHINE_NAME "stub"
+
+#include <assert.h>
+#include <string.h>
+#include <link.h>
+
+
+/* Return nonzero iff E_MACHINE is compatible with the running host. */
+static inline int
+elf_machine_matches_host (Elf32_Half e_machine)
+{
+ switch (e_machine)
+ {
+ default:
+ return 0;
+ }
+}
+
+
+/* Return the run-time address of the _GLOBAL_OFFSET_TABLE_. */
+static inline Elf32_Addr *
+elf_machine_got (void)
+{
+#error "GOT not got"
+}
+
+
+/* Return the run-time load address of the shared object. */
+static inline Elf32_Addr
+elf_machine_load_address (void)
+{
+#error "Where am I?"
+}
+
+/* This can modify DYNAMIC_INFO to avoid relocating code in
+ the functions above if they are doing bizarre magic. */
+#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */
+
+/* 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. */
+
+static inline void
+elf_machine_rel (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
+ const Elf32_Rel *reloc,
+ Elf32_Addr sym_loadaddr, const Elf32_Sym *sym)
+{
+ Elf32_Addr *const reloc_addr = (Elf32_Addr *) reloc->r_offset;
+ const Elf32_Addr sym_value = sym_loadaddr + sym->st_value;
+
+ switch (ELF32_R_TYPE (reloc->r_info))
+ {
+ case R_MACHINE_COPY:
+ memcpy (reloc_addr, (void *) sym_value, sym->st_size);
+ break;
+ default:
+ assert (! "unexpected dynamic reloc type");
+ break;
+ }
+}
+
+
+static inline void
+elf_machine_rela (Elf32_Addr loadaddr, Elf32_Dyn *info[DT_NUM],
+ const Elf32_Rela *reloc,
+ Elf32_Addr sym_loadaddr, const Elf32_Sym *sym)
+{
+ _dl_signal_error (0, "Elf32_Rela relocation requested -- unused on "
+ ELF_MACHINE_NAME);
+}
+
+
+/* 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 void
+elf_machine_runtime_setup (struct link_map *l)
+{
+ extern void _dl_runtime_resolve (Elf32_Word);
+ /* 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]. */
+ Elf32_Addr *got = (Elf32_Addr *) l->l_info[DT_PLTGOT]->d_un.d_ptr;
+ 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;
+}
+
+
+/* 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 #error need some startup code
diff --git a/sysdeps/stub/dl-runtime.c b/sysdeps/stub/dl-runtime.c
new file mode 100644
index 0000000..f660ef2
--- /dev/null
+++ b/sysdeps/stub/dl-runtime.c
@@ -0,0 +1,64 @@
+/* On-demand PLT fixup for shared objects. Stub version.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <link.h>
+#include "dynamic-link.h"
+
+/* This function is not called in the normal way. The PLT jumps here, not
+ using a call. */
+void
+_dl_runtime_resolve ()
+{
+ struct link_map *l = ???;
+ Elf32_Word reloc_offset = ???;
+
+ const Elf32_Sym *const symtab
+ = (const Elf32_Sym *) l->l_info[DT_SYMTAB]->d_un.d_ptr;
+ const char *strtab
+ = ((void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
+
+ const Elf32_Rel *const reloc = (void *) (l->l_info[DT_JMPREL]->d_un.d_ptr
+ + reloc_offset);
+
+ const Elf32_Sym *definer;
+ Elf32_Addr loadbase;
+ struct link_map *scope, *real_next;
+
+ /* Look up the symbol's run-time value. */
+
+ real_next = l->l_next;
+ if (l->l_info[DT_SYMBOLIC])
+ {
+ l->l_prev->l_next = real_next;
+ l->l_next = _dl_loaded;
+ scope = l;
+ }
+ else
+ scope = _dl_loaded;
+
+ definer = &symtab[ELF32_R_SYM (reloc->r_info)];
+ loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer, scope);
+
+ /* Restore list frobnication done above for DT_SYMBOLIC. */
+ l->l_next = real_next;
+ l->l_prev->l_next = l;
+
+ /* Apply the relocation with that value. */
+ elf_machine_rel (l->l_addr, l->l_info, reloc, loadbase, definer);
+}