diff options
Diffstat (limited to 'sysdeps/i386/dl-machine.h')
| -rw-r--r-- | sysdeps/i386/dl-machine.h | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h index dd820fd..9af800c 100644 --- a/sysdeps/i386/dl-machine.h +++ b/sysdeps/i386/dl-machine.h @@ -1,5 +1,5 @@ /* Machine-dependent ELF dynamic relocation inline functions. i386 version. - Copyright (C) 1995, 1996 Free Software Foundation, Inc. + Copyright (C) 1995, 1996, 1997 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 @@ -70,6 +70,12 @@ elf_machine_load_address (void) (dynamic_info)[DT_RELSZ]->d_un.d_val -= sizeof (Elf32_Rel); +/* 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. */ +static ElfW(Addr) fixup (struct link_map *l, ElfW(Word) reloc_offset) + __attribute__ ((regparm (2), unused)); + /* 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. */ @@ -92,15 +98,24 @@ elf_machine_runtime_setup (struct link_map *l, int lazy) got[2] = (Elf32_Addr) &_dl_runtime_resolve; } + /* This code is used in dl-runtime.c to call the `fixup' function and then redirect to the address it returns. */ #define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\ .globl _dl_runtime_resolve .type _dl_runtime_resolve, @function _dl_runtime_resolve: - call fixup # Args pushed by PLT. - addl $8, %esp # Pop args. - jmp *%eax # Jump to function address. + pushl %eax # Preserve registers otherwise clobbered. + pushl %ecx + pushl %edx + movl 16(%esp), %edx # Copy args pushed by PLT in register. Note + movl 12(%esp), %eax # that `fixup' takes its parameters in regs. + call fixup # Call resolver. + popl %edx # Get register content back. + popl %ecx + xchgl %eax, (%esp) # Get %eax contents end store function address. + ret $8 # Jump to function address. + .size _dl_runtime_resolve, .-_dl_runtime_resolve "); /* The PLT uses Elf32_Rel relocs. */ #define elf_machine_relplt elf_machine_rel |