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29 lines
577 B
ArmAsm
29 lines
577 B
ArmAsm
/* https://github.com/cirosantilli/linux-kernel-module-cheat#cmpxchg-instruction */
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#include <lkmc.h>
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LKMC_PROLOGUE
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/* rax != r13 */
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mov $0, %rax
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mov $1, %r13
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mov $2, %r14
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cmpxchg %r14, %r13
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mov %rax, %r12
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LKMC_ASSERT(jnz)
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LKMC_ASSERT_EQ(%rax, $1)
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LKMC_ASSERT_EQ(%r13, $1)
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LKMC_ASSERT_EQ(%r14, $2)
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/* rax == r13 */
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mov $0, %rax
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mov $0, %r13
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mov $2, %r14
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cmpxchg %r14, %r13
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mov %rax, %r12
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LKMC_ASSERT(jz)
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LKMC_ASSERT_EQ(%rax, $0)
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LKMC_ASSERT_EQ(%r13, $2)
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LKMC_ASSERT_EQ(%r14, $2)
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LKMC_EPILOGUE
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