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https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-23 10:15:57 +01:00
37 lines
870 B
ArmAsm
37 lines
870 B
ArmAsm
#include <lkmc.h>
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/* This is implemented in assembly so that it does not use the stack,
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* and thus can be called safely from programs without the bootloader.
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* C signature:
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*
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* void _exit(int status)
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*
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* If only there was a GCC attribute to create such a function!
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* https://stackoverflow.com/questions/43310704/creating-a-c-function-without-compiler-generated-prologue-epilogue-ret-instruc
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*/
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.text
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.global _exit
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_exit:
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#if LKMC_GEM5
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LKMC_M5OPS_EXIT_ASM
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#else
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/* Use semihosting:
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* https://cirosantilli.com/linux-kernel-module-cheat#semihosting */
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#if defined(__arm__)
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mov r0, #0x18
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ldr r1, =#0x20026
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svc 0x00123456
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#elif defined(__aarch64__)
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mov x1, 0x26
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movk x1, 2, lsl 16
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ldr x2, =.Lsemihost_args
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str x1, [x2, 0]
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str x0, [x2, 8]
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mov x1, x2
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mov w0, 0x18
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hlt 0xf000
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.Lsemihost_args:
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.skip 16
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#endif
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#endif
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