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Make fpusave() and fpurestore() on amd64 ifuncs.

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From now on, linking amd64 kernel requires either lld or newer ld.bfd.

Reviewed by:	jhb (as part of the large patch)
Discussed with:	emaste
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D13838
This commit is contained in:
Konstantin Belousov 2018-05-10 15:01:43 +00:00
parent 4072ae4e02
commit 8b4fc8b11c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=333461
1 changed files with 46 additions and 16 deletions
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62
sys/amd64/amd64/fpu.c
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@ -61,6 +61,7 @@ __FBSDID("$FreeBSD$");
#include <machine/specialreg.h>
#include <machine/segments.h>
#include <machine/ucontext.h>
#include <x86/ifunc.h>
/*
* Floating point support.
@ -151,24 +152,58 @@ struct xsave_area_elm_descr {
u_int size;
} *xsave_area_desc;
void
fpusave(void *addr)
static void
fpusave_xsave(void *addr)
{
if (use_xsave)
xsave((char *)addr, xsave_mask);
else
fxsave((char *)addr);
xsave((char *)addr, xsave_mask);
}
void
fpurestore(void *addr)
static void
fpurestore_xrstor(void *addr)
{
xrstor((char *)addr, xsave_mask);
}
static void
fpusave_fxsave(void *addr)
{
fxsave((char *)addr);
}
static void
fpurestore_fxrstor(void *addr)
{
fxrstor((char *)addr);
}
static void
init_xsave(void)
{
if (use_xsave)
xrstor((char *)addr, xsave_mask);
else
fxrstor((char *)addr);
return;
if ((cpu_feature2 & CPUID2_XSAVE) == 0)
return;
use_xsave = 1;
TUNABLE_INT_FETCH("hw.use_xsave", &use_xsave);
}
DEFINE_IFUNC(, void, fpusave, (void *), static)
{
init_xsave();
return (use_xsave ? fpusave_xsave : fpusave_fxsave);
}
DEFINE_IFUNC(, void, fpurestore, (void *), static)
{
init_xsave();
return (use_xsave ? fpurestore_xrstor : fpurestore_fxrstor);
}
void
@ -207,13 +242,8 @@ fpuinit_bsp1(void)
uint64_t xsave_mask_user;
bool old_wp;
if ((cpu_feature2 & CPUID2_XSAVE) != 0) {
use_xsave = 1;
TUNABLE_INT_FETCH("hw.use_xsave", &use_xsave);
}
if (!use_xsave)
return;
cpuid_count(0xd, 0x0, cp);
xsave_mask = XFEATURE_ENABLED_X87 | XFEATURE_ENABLED_SSE;
if ((cp[0] & xsave_mask) != xsave_mask)