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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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c8c4f89854
Previously had wonky line pointer in asm_main. New interface simpler and more portable. Add tests for ASSERT_EQ_ and family in arm and aarch64, previously on x86_64. ASSERT_EQ_ and family in ARM can now either take =123, =addr or var, before this the = was added on macros so var was not possible. Define the main function directly in assembly, the C driver was useless.
27 lines
890 B
ArmAsm
27 lines
890 B
ArmAsm
/* https://github.com/cirosantilli/linux-kernel-module-cheat#armv8-aarch64-movk-instruction */
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#include <lkmc.h>
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LKMC_PROLOGUE
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movk x0, 0x4444, lsl 0
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movk x0, 0x3333, lsl 16
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movk x0, 0x2222, lsl 32
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movk x0, 0x1111, lsl 48
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LKMC_ASSERT_EQ(x0, =0x1111222233334444)
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/* Set a label (addresses are 48-bit) with immediates:
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*
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* * https://stackoverflow.com/questions/38570495/aarch64-relocation-prefixes
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* * https://sourceware.org/binutils/docs-2.26/as/AArch64_002dRelocations.html
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*
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* This could be used if the label is too far away for
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* adr relative addressing.
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*/
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movz x0, :abs_g2:label /* bits 32-47, overflow check */
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movk x0, :abs_g1_nc:label /* bits 16-31, no overflow check */
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movk x0, :abs_g0_nc:label /* bits 0-15, no overflow check */
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adr x1, label
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label:
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LKMC_ASSERT_EQ_REG(x0, x1)
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LKMC_EPILOGUE
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