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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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b3874cc72b
To help with backtraces if we ever fix them due to the lkmc_asm_main_after_prologue debacle.
27 lines
900 B
ArmAsm
27 lines
900 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:.Llabel /* bits 32-47, overflow check */
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movk x0, :abs_g1_nc:.Llabel /* bits 16-31, no overflow check */
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movk x0, :abs_g0_nc:.Llabel /* bits 0-15, no overflow check */
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adr x1, .Llabel
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.Llabel:
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LKMC_ASSERT_EQ_REG(x0, x1)
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LKMC_EPILOGUE
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