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.
59 lines
1.1 KiB
ArmAsm
59 lines
1.1 KiB
ArmAsm
/* https://github.com/cirosantilli/linux-kernel-module-cheat#arm-data-processing-instructions */
|
|
|
|
#include <lkmc.h>
|
|
|
|
LKMC_PROLOGUE
|
|
|
|
/* Immediate encoding.
|
|
*
|
|
* r1 = r0 + 2
|
|
*/
|
|
mov r0, 1
|
|
/* r1 = r0 + 2 */
|
|
add r1, r0, 2
|
|
LKMC_ASSERT_EQ(r1, =3)
|
|
|
|
/* If src == dest, we can omit one of them.
|
|
*
|
|
* r0 = r0 + 2
|
|
*/
|
|
mov r0, 1
|
|
add r0, 2
|
|
LKMC_ASSERT_EQ(r0, =3)
|
|
|
|
/* Same as above but explicit. */
|
|
mov r0, 1
|
|
add r0, r0, 2
|
|
LKMC_ASSERT_EQ(r0, =3)
|
|
|
|
#if 0
|
|
/* But we cannot omit the register if there is a shift when using .syntx unified:
|
|
* https://github.com/cirosantilli/linux-kernel-module-cheat#shift-suffixes
|
|
*/
|
|
.syntax unified
|
|
/* Error: garbage following instruction */
|
|
add r0, r1, lsl 1
|
|
/* OK */
|
|
add r0, r0, r1, lsl 1
|
|
#endif
|
|
|
|
/* Register encoding.
|
|
*
|
|
* r2 = r0 + r1
|
|
*/
|
|
mov r0, 1
|
|
mov r1, 2
|
|
add r2, r0, r1
|
|
LKMC_ASSERT_EQ(r2, =3)
|
|
|
|
/* Register encoding, omit implicit register.
|
|
*
|
|
* r1 = r1 + r0
|
|
*/
|
|
mov r0, 1
|
|
mov r1, 2
|
|
add r1, r0
|
|
LKMC_ASSERT_EQ(r1, =3)
|
|
|
|
LKMC_EPILOGUE
|