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* sysdeps/i386/dl-machine.h (elf_machine_load_address): Add a dummy 

global variable reference in an unused asm parameter, to ensure the
	compiler has set up the GOT register before we use it.
This commit is contained in:
Roland McGrath 2002-08-23 10:35:03 +00:00
parent 3d31e109a0
commit 16495f8127
2 changed files with 9 additions and 1 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2002-08-23 Roland McGrath <roland@redhat.com> 2002-08-23 Roland McGrath <roland@redhat.com>
* sysdeps/i386/dl-machine.h (elf_machine_load_address): Add a dummy
global variable reference in an unused asm parameter, to ensure the
compiler has set up the GOT register before we use it.
* malloc/hooks.c: Move variable definitions ahead of uses. * malloc/hooks.c: Move variable definitions ahead of uses.
* libio/fileops.c: Move versioned_symbol defns ahead of _IO_jump_t * libio/fileops.c: Move versioned_symbol defns ahead of _IO_jump_t
initializers that make reference to variables they define. initializers that make reference to variables they define.

6
sysdeps/i386/dl-machine.h
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@ -49,10 +49,14 @@ elf_machine_dynamic (void)
static inline Elf32_Addr __attribute__ ((unused)) static inline Elf32_Addr __attribute__ ((unused))
elf_machine_load_address (void) elf_machine_load_address (void)
{ {
/* It doesn't matter what variable this is, the reference never makes
it to assembly. We need a dummy reference to some global variable
via the GOT to make sure the compiler initialized %ebx in time. */
extern int _dl_argc;
Elf32_Addr addr; Elf32_Addr addr;
asm ("leal _dl_start@GOTOFF(%%ebx), %0\n" asm ("leal _dl_start@GOTOFF(%%ebx), %0\n"
"subl _dl_start@GOT(%%ebx), %0" "subl _dl_start@GOT(%%ebx), %0"
: "=r" (addr) : : "cc"); : "=r" (addr) : "m" (_dl_argc) : "cc");
return addr; return addr;
} }