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| author | Denys Vlasenko <dvlasenk@redhat.com> | 2015-09-18 17:53:29 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-09-20 11:19:53 +0300 |
| commit | b8e4a910e576961009a87d07f6b7eff67c5c2e34 (patch) | |
| tree | 0229856273cd9a260b6908a7a6747b0e2f0dd2e7 /arch/x86/math-emu/fpu_entry.c | |
| parent | 4aef363e48177d451b4d263c69dd2c86437e988b (diff) | |
| download | linux-b8e4a910e576961009a87d07f6b7eff67c5c2e34.tar.xz | |
x86/fpu/math-emu: Add support for F[U]COMI[P] insns
Run-tested by booting with "no387 nofxsr" and running test
program:
[RUN] Testing f[u]comi[p] instructions
[OK] f[u]comi[p]
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442588010-20055-2-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/math-emu/fpu_entry.c')
| -rw-r--r-- | arch/x86/math-emu/fpu_entry.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c index 65afd46643f0..4ecf68342d7b 100644 --- a/arch/x86/math-emu/fpu_entry.c +++ b/arch/x86/math-emu/fpu_entry.c @@ -40,6 +40,8 @@ #define __BAD__ FPU_illegal /* Illegal on an 80486, causes SIGILL */ +/* f(u)comi(p) are enabled if CPUID(1).EDX(15) "cmov" is set */ + /* WARNING: "u" entries are not documented by Intel in their 80486 manual and may not work on FPU clones or later Intel FPUs. Changes to support them provided by Linus Torvalds. */ @@ -57,10 +59,10 @@ static FUNC const st_instr_table[64] = { /* d8..f */ fcompst,/*u*/ fstp_i, fcompp, fstp_i,/*u*/ /* e0..7 */ fsub__, FPU_etc, __BAD__, finit_, /* e0..7 */ fsubri, fucom_, fsubrp, fstsw_, -/* e8..f */ fsubr_, fconst, fucompp, __BAD__, -/* e8..f */ fsub_i, fucomp, fsubp_, __BAD__, -/* f0..7 */ fdiv__, FPU_triga, __BAD__, __BAD__, -/* f0..7 */ fdivri, __BAD__, fdivrp, __BAD__, +/* e8..f */ fsubr_, fconst, fucompp, fucomi_, +/* e8..f */ fsub_i, fucomp, fsubp_, fucomip, +/* f0..7 */ fdiv__, FPU_triga, __BAD__, fcomi_, +/* f0..7 */ fdivri, __BAD__, fdivrp, fcomip, /* f8..f */ fdivr_, FPU_trigb, __BAD__, __BAD__, /* f8..f */ fdiv_i, __BAD__, fdivp_, __BAD__, }; @@ -77,14 +79,15 @@ static FUNC const st_instr_table[64] = { #define _REGIn 0 /* Uses st(0) and st(rm), but handle checks later */ static u_char const type_table[64] = { - _REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _REGi_, - _REGI_, _REGIn, _null_, _null_, _REGIi, _REGI_, _REGIp, _REGI_, - _REGIc, _NONE_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_, - _REGIc, _REG0_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_, - _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_, - _REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_, - _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_, - _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_ +/* Opcode: d8 d9 da db dc dd de df */ +/* c0..7 */ _REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _REGi_, +/* c8..f */ _REGI_, _REGIn, _null_, _null_, _REGIi, _REGI_, _REGIp, _REGI_, +/* d0..7 */ _REGIc, _NONE_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_, +/* d8..f */ _REGIc, _REG0_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_, +/* e0..7 */ _REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_, +/* e8..f */ _REGI_, _NONE_, _REGIc, _REGIc, _REGIi, _REGIc, _REGIp, _REGIc, +/* f0..7 */ _REGI_, _NONE_, _null_, _REGIc, _REGIi, _null_, _REGIp, _REGIc, +/* f8..f */ _REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_, }; #ifdef RE_ENTRANT_CHECKING |