mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 02:05:57 +01:00
60 lines
1.3 KiB
ArmAsm
60 lines
1.3 KiB
ArmAsm
/* https://github.com/cirosantilli/linux-kernel-module-cheat#userland-assembly */
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#include <lkmc.h>
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LKMC_PROLOGUE
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/* Register immediate. */
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mov $1, %rax
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add $2, %rax
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LKMC_ASSERT_EQ(%rax, $3)
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/* Register register. */
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mov $1, %rax
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mov $2, %rbx
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add %rbx, %rax
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LKMC_ASSERT_EQ(%rax, $3)
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/* Memory and immediate. */
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.data
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memory_immediate: .quad 0x123456789ABCDEF0
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.text
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addq $1, memory_immediate
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LKMC_ASSERT_EQ(memory_immediate, $0x123456789ABCDEF1)
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/* Memory and register. */
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.data
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memory_register: .quad 0x123456789ABCDEF0
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.text
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mov $1, %rax
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add %rax, memory_register
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LKMC_ASSERT_EQ(memory_register, $0x123456789ABCDEF1)
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#if 0
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/* Cannot do different register sizes:
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* Error: operand type mismatch for for `add'
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*/
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add %rax, %eax
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#endif
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#if 0
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/* Cannot do memory memory.
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* Error: too many memory references for `add'
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*/
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addq memory_immediate, memory_register
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#endif
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/* ADD and many other instructions automatically update the status flags
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* which controls branches.
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*/
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/* Equals 0. */
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mov $1, %rax
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add $-1, %rax
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LKMC_ASSERT(je)
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/* Not equals 0. */
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mov $2, %rax
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add $-1, %rax
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LKMC_ASSERT(jne)
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LKMC_EPILOGUE
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