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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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60 lines
1.2 KiB
ArmAsm
60 lines
1.2 KiB
ArmAsm
/* https://cirosantilli.com/linux-kernel-module-cheat#arm-calling-convention */
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#include <lkmc.h>
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.data
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puts_s:
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.asciz "hello puts"
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printf_format:
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.asciz "hello printf %x\n"
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my_array_0:
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.word 0x11111111, 0x22222222, 0x33333333, 0x44444444
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my_array_1:
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.word 0x55555555, 0x66666666, 0x77777777, 0x88888888
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LKMC_PROLOGUE
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/* puts("hello world") */
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/* r0 is first argument. */
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ldr r0, =puts_s
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bl puts
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/* Check exit status >= 0 for success. */
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cmp r0, 0
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LKMC_ASSERT(bge)
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/* printf */
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ldr r0, =printf_format
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ldr r1, =0x12345678
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bl printf
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cmp r0, 0
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LKMC_ASSERT(bge)
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/* memcpy and memcmp. */
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/* Smaller. */
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ldr r0, =my_array_0
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ldr r1, =my_array_1
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ldr r2, =0x10
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bl memcmp
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cmp r0, 0
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LKMC_ASSERT(blt)
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/* Copy. */
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ldr r0, =my_array_0
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ldr r1, =my_array_1
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ldr r2, =0x10
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bl memcpy
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/* Equal. */
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ldr r0, =my_array_0
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ldr r1, =my_array_1
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ldr r2, =0x10
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bl memcmp
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LKMC_ASSERT_EQ(r0, =0)
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/* exit(0) */
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mov r0, 0
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bl exit
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/* Never reached, just for the fail symbol. */
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LKMC_EPILOGUE
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