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x86 asm: move x87 FPU instructions from x86-assembly-cheat

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Ciro Santilli 六四事件 法轮功
2019-06-22 00:00:01 +00:00
parent f66e777337
commit 082901414a
12 changed files with 339 additions and 0 deletions
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45
userland/arch/x86_64/fxch.S Normal file
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@@ -0,0 +1,45 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#x86-x87-fpu-instructions */
#include <lkmc.h>
.data
double_0_0: .double 0.0
double_1_0: .double 1.0
LKMC_PROLOGUE
fldz
# ST0 = 0.0
fld1
# ST0 = 1.0
# ST1 = 0.0
# Swap ST0 and ST1.
fxch %st(1)
# ST0 = 0.0
# ST1 = 1.0
fldz
# ST0 = 0.0
# ST1 = 0.0
# ST2 = 1.0
fcomip %st(1)
# ST0 = 0.0
# ST1 = 1.0
LKMC_ASSERT(je)
# Swap ST0 and ST1.
fxch %st(1)
# ST0 = 1.0
# ST1 = 0.0
fld1
# ST0 = 1.0
# ST1 = 1.0
# ST2 = 0.0
fcomip %st(1)
# ST0 = 1.0
# ST1 = 0.0
LKMC_ASSERT(je)
LKMC_EPILOGUE