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tcg-ppc64: Use getauxval for ISA detection 

Glibc 2.16 includes an easy way to get feature bits previously
buried in /proc or the program startup auxiliary vector.  Use it.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-02-18 09:11:15 -08:00
parent 027ffea972
commit 1e6e9aca15
2 changed files with 32 additions and 0 deletions
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18
configure vendored
View File

@ -3308,6 +3308,20 @@ if compile_prog "" "" ; then
int128=yes
fi
########################################
# check if getauxval is available.
getauxval=no
cat > $TMPC << EOF
#include <sys/auxv.h>
int main(void) {
return getauxval(AT_HWCAP) == 0;
}
EOF
if compile_prog "" "" ; then
getauxval=yes
fi
##########################################
# End of CC checks
# After here, no more $cc or $ld runs
@ -3858,6 +3872,10 @@ if test "$int128" = "yes" ; then
echo "CONFIG_INT128=y" >> $config_host_mak
fi
if test "$getauxval" = "yes" ; then
echo "CONFIG_GETAUXVAL=y" >> $config_host_mak
fi
if test "$glusterfs" = "yes" ; then
echo "CONFIG_GLUSTERFS=y" >> $config_host_mak
fi

14
tcg/ppc64/tcg-target.c
View File

@ -44,8 +44,15 @@ static uint8_t *tb_ret_addr;
#define GUEST_BASE 0
#endif
#ifdef CONFIG_GETAUXVAL
#include <sys/auxv.h>
static bool have_isa_2_06;
#define HAVE_ISA_2_06 have_isa_2_06
#define HAVE_ISEL have_isa_2_06
#else
#define HAVE_ISA_2_06 0
#define HAVE_ISEL 0
#endif
#ifdef CONFIG_USE_GUEST_BASE
#define TCG_GUEST_BASE_REG 30
@ -2059,6 +2066,13 @@ static const TCGTargetOpDef ppc_op_defs[] = {
static void tcg_target_init (TCGContext *s)
{
#ifdef CONFIG_GETAUXVAL
unsigned long hwcap = getauxval(AT_HWCAP);
if (hwcap & PPC_FEATURE_ARCH_2_06) {
have_isa_2_06 = true;
}
#endif
tcg_regset_set32 (tcg_target_available_regs[TCG_TYPE_I32], 0, 0xffffffff);
tcg_regset_set32 (tcg_target_available_regs[TCG_TYPE_I64], 0, 0xffffffff);
tcg_regset_set32 (tcg_target_call_clobber_regs, 0,