mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 02:05:57 +01:00
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.
61 lines
1.2 KiB
ArmAsm
61 lines
1.2 KiB
ArmAsm
/* https://github.com/cirosantilli/linux-kernel-module-cheat#advanced-simd-instructions */
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#include <lkmc.h>
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LKMC_PROLOGUE
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/* 1.5 + 2.5 == 4.0
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* using 64-bit double immediates.
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*/
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fmov d0, 1.5
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fmov d1, 2.5
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fadd d2, d0, d1
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fmov d3, 4.0
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/* Unlike VFP vcmp, this stores the status
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* automatically in the main CPSR.
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*/
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fcmp d2, d3
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LKMC_ASSERT(beq)
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/* Now with a memory stored value. */
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.data
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my_double_0:
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.double 1.5
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my_double_1:
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.double 2.5
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my_double_sum_expect:
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.double 4.0
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.text
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ldr d0, my_double_0
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ldr d1, my_double_1
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fadd d2, d0, d1
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ldr d3, my_double_sum_expect
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fcmp d2, d3
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LKMC_ASSERT(beq)
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/* Now in 32-bit. */
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fmov s0, 1.5
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fmov s1, 2.5
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fadd s2, s0, s1
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fmov s3, 4.0
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fcmp s2, s3
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LKMC_ASSERT(beq)
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/* TODO why? What's the point of q then?
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* Error: operand mismatch -- `fmov q0,1.5'
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*/
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#if 0
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fmov q0, 1.5
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#endif
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/* Much like integers, immediates are constrained to
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* fit in 32-byte instructions. TODO exact rules.
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*
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* Assembly here would fail with:
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*
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* Error: invalid floating-point constant at operand 2
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*/
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#if 0
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fmov d0, 1.23456798
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#endif
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LKMC_EPILOGUE
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