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Subject[tip:x86/fpu] x86/fpu/math-emu: Remove define layer for undocumented opcodes
Commit-ID:  4aef363e48177d451b4d263c69dd2c86437e988b
Gitweb: http://git.kernel.org/tip/4aef363e48177d451b4d263c69dd2c86437e988b
Author: Denys Vlasenko <dvlasenk@redhat.com>
AuthorDate: Fri, 18 Sep 2015 16:53:28 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Sun, 20 Sep 2015 10:19:52 +0200

x86/fpu/math-emu: Remove define layer for undocumented opcodes

No code changes.

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/1442588010-20055-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/math-emu/fpu_entry.c | 43 +++++++++++++++++++++----------------------
1 file changed, 21 insertions(+), 22 deletions(-)

diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index 929b1d5..65afd46 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -40,30 +40,29 @@

#define __BAD__ FPU_illegal /* Illegal on an 80486, causes SIGILL */

-/* WARNING: These codes are not documented by Intel in their 80486 manual
- and may not work on FPU clones or later Intel FPUs. */
-
-/* Changes to support the un-doc codes provided by Linus Torvalds. */
-
-#define _d9_d8_ fstp_i /* unofficial code (19) */
-#define _dc_d0_ fcom_st /* unofficial code (14) */
-#define _dc_d8_ fcompst /* unofficial code (1c) */
-#define _dd_c8_ fxch_i /* unofficial code (0d) */
-#define _de_d0_ fcompst /* unofficial code (16) */
-#define _df_c0_ ffreep /* unofficial code (07) ffree + pop */
-#define _df_c8_ fxch_i /* unofficial code (0f) */
-#define _df_d0_ fstp_i /* unofficial code (17) */
-#define _df_d8_ fstp_i /* unofficial code (1f) */
+/* 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. */

static FUNC const st_instr_table[64] = {
- fadd__, fld_i_, __BAD__, __BAD__, fadd_i, ffree_, faddp_, _df_c0_,
- fmul__, fxch_i, __BAD__, __BAD__, fmul_i, _dd_c8_, fmulp_, _df_c8_,
- fcom_st, fp_nop, __BAD__, __BAD__, _dc_d0_, fst_i_, _de_d0_, _df_d0_,
- fcompst, _d9_d8_, __BAD__, __BAD__, _dc_d8_, fstp_i, fcompp, _df_d8_,
- fsub__, FPU_etc, __BAD__, finit_, fsubri, fucom_, fsubrp, fstsw_,
- fsubr_, fconst, fucompp, __BAD__, fsub_i, fucomp, fsubp_, __BAD__,
- fdiv__, FPU_triga, __BAD__, __BAD__, fdivri, __BAD__, fdivrp, __BAD__,
- fdivr_, FPU_trigb, __BAD__, __BAD__, fdiv_i, __BAD__, fdivp_, __BAD__,
+/* Opcode: d8 d9 da db */
+/* dc dd de df */
+/* c0..7 */ fadd__, fld_i_, __BAD__, __BAD__,
+/* c0..7 */ fadd_i, ffree_, faddp_, ffreep,/*u*/
+/* c8..f */ fmul__, fxch_i, __BAD__, __BAD__,
+/* c8..f */ fmul_i, fxch_i,/*u*/ fmulp_, fxch_i,/*u*/
+/* d0..7 */ fcom_st, fp_nop, __BAD__, __BAD__,
+/* d0..7 */ fcom_st,/*u*/ fst_i_, fcompst,/*u*/ fstp_i,/*u*/
+/* d8..f */ fcompst, fstp_i,/*u*/ __BAD__, __BAD__,
+/* 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__,
+/* f8..f */ fdivr_, FPU_trigb, __BAD__, __BAD__,
+/* f8..f */ fdiv_i, __BAD__, fdivp_, __BAD__,
};

#define _NONE_ 0 /* Take no special action */

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