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/*

* References:

* - https://developer.arm.com/documentation/101028/0012/5--Feature-test-macros

* - https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst

*/

#if defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1

#define BTI_J hint 36 /* bti j: for jumps, IE br instructions */

#define BTI_C hint 34 /* bti c: for calls, IE bl instructions */

#define GNU_PROPERTY_AARCH64_BTI 1 /* bit 0 GNU Notes is for BTI support */

#else

#define BTI_J

#define BTI_C

#define GNU_PROPERTY_AARCH64_BTI 0

#endif

#if defined(__ARM_FEATURE_PAC_DEFAULT)

#if __ARM_FEATURE_PAC_DEFAULT & 1

#define SIGN_LR hint 25 /* paciasp: sign with the A key */

#define VERIFY_LR hint 29 /* autiasp: verify with the A key */

#elif __ARM_FEATURE_PAC_DEFAULT & 2

#define SIGN_LR hint 27 /* pacibsp: sign with the b key */

#define VERIFY_LR hint 31 /* autibsp: verify with the b key */

#endif

#define GNU_PROPERTY_AARCH64_POINTER_AUTH 2 /* bit 1 GNU Notes is for PAC support */

#else

#define SIGN_LR BTI_C

#define VERIFY_LR

#define GNU_PROPERTY_AARCH64_POINTER_AUTH 0

#endif

#if defined(__ARM_FEATURE_GCS_DEFAULT) && __ARM_FEATURE_GCS_DEFAULT == 1

#define GNU_PROPERTY_AARCH64_GCS 4 /* bit 2 GNU Notes is for GCS support */

#else

#define GNU_PROPERTY_AARCH64_GCS 0

#endif

.text

#if defined(__aarch64__) && defined(__AARCH64EL__) && !defined(__ILP32__)

#if defined(__APPLE__)

.globl __Py_trampoline_func_start

__Py_trampoline_func_start:

#else

.globl _Py_trampoline_func_start

_Py_trampoline_func_start:

#endif

SIGN_LR

stp x29, x30, [sp, -16]!

mov x29, sp

blr x3

ldp x29, x30, [sp], 16

VERIFY_LR

ret

#if defined(__APPLE__)

.globl __Py_trampoline_func_end

__Py_trampoline_func_end:

#else

.globl _Py_trampoline_func_end

_Py_trampoline_func_end:

.section .note.GNU-stack,"",@progbits

#endif

/* Add the BTI, PAC and GCS support to GNU Notes section */

#if GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_POINTER_AUTH != 0 || GNU_PROPERTY_AARCH64_GCS != 0

.pushsection .note.gnu.property, "a"; /* Start a new allocatable section */

.balign 8; /* align it on a byte boundry */

.long 4; /* size of "GNU\0" */

.long 0x10; /* size of descriptor */

.long 0x5; /* NT_GNU_PROPERTY_TYPE_0 */

.asciz "GNU";

.long 0xc0000000; /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */

.long 4; /* Four bytes of data */

.long (GNU_PROPERTY_AARCH64_BTI|GNU_PROPERTY_AARCH64_POINTER_AUTH|GNU_PROPERTY_AARCH64_GCS); /* BTI, PAC or GCS is enabled */

.long 0; /* padding for 8 byte alignment */

.popsection; /* end the section */

#endif

#endif // __aarch64__ && __AARCH64EL__ && !__ILP32__