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39 lines
760 B
ArmAsm
39 lines
760 B
ArmAsm
/* https://cirosantilli.com/linux-kernel-module-cheat#x86-shift-and-rotate-instructions */
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#include <lkmc.h>
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LKMC_PROLOGUE
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mov $0x81, %r12
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clc
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rcl $1, %r12b
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/* We'll have to save and restore flags across our asserts!
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* 2x PUSHF to maintain 16-bit stack alignment.
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* https://cirosantilli.com/linux-kernel-module-cheat#x86-64-calling-convention
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*/
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pushf
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pushf
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LKMC_ASSERT(jc)
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LKMC_ASSERT_EQ(%r12, $2)
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popf
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rcl $1, %r12b
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pushf
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LKMC_ASSERT(jnc)
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LKMC_ASSERT_EQ(%r12, $5)
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popf
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rcr $2, %r12b
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pushf
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LKMC_ASSERT(jnc)
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LKMC_ASSERT_EQ(%r12, $0x81)
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popf
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rcr $1, %r12b
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pushf
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LKMC_ASSERT(jc)
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LKMC_ASSERT_EQ(%r12, $0x40)
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add $16, %rsp
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LKMC_EPILOGUE
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