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/* Machine-dependent ELF dynamic relocation inline functions.
FreeBSD i386 specific version of dl_platform_init()
Copyright (C) 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Petr Salinger, 2006.
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. */
/* For FreeBSD we redefine an initialization function.
This is called very early in dl_sysdep_start. */
#if 0
Under FreeBSD:
#define AT_EXECPATH 15 /* Path to the executable. */
Under Linux:
#define AT_PLATFORM 15 /* String identifying platform. */
Filled entries from kernel:
if (args->execfd != -1)
AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
AUXARGS_ENTRY(pos, AT_BASE, args->base);
if (imgp->execpathp != 0)
AUXARGS_ENTRY(pos, AT_EXECPATH, imgp->execpathp);
AUXARGS_ENTRY(pos, AT_NULL, 0);
#endif
#include_next <dl-machine.h>
#undef DL_PLATFORM_INIT
#define DL_PLATFORM_INIT dl_platform_kfreebsd_i386_init ()
#ifndef _DL_MACHINE_KFREEBSD
#define _DL_MACHINE_KFREEBSD
#define X86_EFLAGS_AC 0x00040000 /* Alignment Check */
#define X86_EFLAGS_ID 0x00200000 /* CPUID detection flag */
static inline int try_flip_flags(int val)
{
int ret;
__asm__(
"pushfl\n\t"
"pushfl\n\t"
"popl %%ecx\n\t"
"xorl %%ecx,%%eax\n\t"
"pushl %%eax\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %%eax\n\t"
"xorl %%ecx,%%eax\n\t"
"popfl\n\t"
: "=a" (ret)
: "0" (val)
: "cx"
);
return ret;
}
static inline void cpuid(int op, int *eax, int *edx)
{
__asm__(
"push %%ebx\n\t"
"cpuid\n\t"
"pop %%ebx\n\t"
: "=a" (*eax),
"=d" (*edx)
: "0" (op)
: "cx"
);
}
static inline void __attribute__ ((unused))
dl_platform_kfreebsd_i386_init (void)
{
/* we don't have reasonable AT_PLATFORM from kernel
try to use cpuid to get one, also guess AT_HWCAP */
int val, hwcap;
val = try_flip_flags(X86_EFLAGS_AC | X86_EFLAGS_ID);
if (!(val & X86_EFLAGS_AC))
{
/* 386 */
GLRO(dl_platform) = GLRO(dl_x86_platforms)[0];
GLRO(dl_hwcap) = 0;
}
else if (!(val & X86_EFLAGS_ID))
{
/* 486 */
GLRO(dl_platform) = GLRO(dl_x86_platforms)[1];
GLRO(dl_hwcap) = 0;
}
else
{
cpuid(0, &val, &hwcap);
if (val == 0)
{
/* 486 */
GLRO(dl_platform) = GLRO(dl_x86_platforms)[1];
GLRO(dl_hwcap) = 0;
}
else
{
cpuid(1, &val, &hwcap);
GLRO(dl_hwcap) = hwcap;
switch (val & 0xf00)
{
case 0x400: /* 486 */
GLRO(dl_platform) = GLRO(dl_x86_platforms)[1];
break;
case 0x500: /* 586 */
GLRO(dl_platform) = GLRO(dl_x86_platforms)[2];
break;
default: /* 686 */
GLRO(dl_platform) = GLRO(dl_x86_platforms)[3];
}
}
}
}
#endif
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