Make fpusave() and fpurestore() on amd64 ifuncs.
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
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=333461
@ -61,6 +61,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/specialreg.h>
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#include <machine/segments.h>
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#include <machine/ucontext.h>
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#include <x86/ifunc.h>
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/*
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* Floating point support.
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@ -151,24 +152,58 @@ struct xsave_area_elm_descr {
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u_int size;
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} *xsave_area_desc;
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void
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fpusave(void *addr)
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static void
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fpusave_xsave(void *addr)
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{
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if (use_xsave)
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xsave((char *)addr, xsave_mask);
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else
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fxsave((char *)addr);
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xsave((char *)addr, xsave_mask);
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}
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void
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fpurestore(void *addr)
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static void
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fpurestore_xrstor(void *addr)
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{
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xrstor((char *)addr, xsave_mask);
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}
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static void
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fpusave_fxsave(void *addr)
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{
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fxsave((char *)addr);
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}
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static void
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fpurestore_fxrstor(void *addr)
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{
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fxrstor((char *)addr);
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}
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static void
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init_xsave(void)
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{
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if (use_xsave)
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xrstor((char *)addr, xsave_mask);
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else
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fxrstor((char *)addr);
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return;
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if ((cpu_feature2 & CPUID2_XSAVE) == 0)
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return;
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use_xsave = 1;
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TUNABLE_INT_FETCH("hw.use_xsave", &use_xsave);
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}
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DEFINE_IFUNC(, void, fpusave, (void *), static)
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{
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init_xsave();
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return (use_xsave ? fpusave_xsave : fpusave_fxsave);
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}
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DEFINE_IFUNC(, void, fpurestore, (void *), static)
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{
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init_xsave();
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return (use_xsave ? fpurestore_xrstor : fpurestore_fxrstor);
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}
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void
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@ -207,13 +242,8 @@ fpuinit_bsp1(void)
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uint64_t xsave_mask_user;
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bool old_wp;
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if ((cpu_feature2 & CPUID2_XSAVE) != 0) {
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use_xsave = 1;
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TUNABLE_INT_FETCH("hw.use_xsave", &use_xsave);
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}
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if (!use_xsave)
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return;
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cpuid_count(0xd, 0x0, cp);
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xsave_mask = XFEATURE_ENABLED_X87 | XFEATURE_ENABLED_SSE;
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if ((cp[0] & xsave_mask) != xsave_mask)
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