update arm64 assembly to link/build on apple silicon mac

[redthing1]

This updates the arm64 assembly code, to resolve the issues brought up here.

Trying to build it from the original source here results in the assembler complaining:

/code/funchook/src/prehook-arm64-gas.S:4:2: error: unknown directive
 .type funchook_hook_caller_asm, %function
 ^

This is because the assembler for arm64 mac doesn't support that directive. Additionally, the naming of symbols defined in assembly is different.
I made a copy of the aarch64 asm files and fixed the syntax, so that it properly builds and links for arm64 mac. I also ran the tests with these results:

*** Skip tests changing executable compiled by Xcode 11.0 or upper on macOS. ***
[1] test_funchook_int: get_val_in_dll
[2] test_funchook_int: call_get_val_in_dll
[3] test_funchook_int: jump_get_val_in_dll
[4] test_funchook_uint64: arm64_test_adr
[5] test_funchook_uint64: arm64_test_beq
[6] test_funchook_uint64: arm64_test_bne
[7] test_funchook_uint64: arm64_test_cbnz
[8] test_funchook_uint64: arm64_test_cbz
[9] test_funchook_uint64: arm64_test_ldr_w
[10] test_funchook_uint64: arm64_test_ldr_x
[11] test_funchook_uint64: arm64_test_ldrsw
[12] test_funchook_uint64: arm64_test_ldr_s
[13] test_funchook_uint64: arm64_test_ldr_d
[14] test_funchook_uint64: arm64_test_ldr_q
[15] test_funchook_uint64: arm64_test_prfm
[16] test_funchook_uint64: arm64_test_tbnz
[17] test_funchook_uint64: arm64_test_tbz
[18] test_hook_open_and_fopen
ERROR: failed to install open and fopen hooks. (Failed to unprotect memory 0x180ecc000 (size=16384, prot=read,write) <- 0x180ececa4 (size=8, error=Permission denied))
[19] test_hook_many_funcs
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
[20] test_prehook: func_info
[21] test_prehook: long_args
[22] test_prehook: double_args
[23] test_prehook: mixed_args
[24] test_prehook: fastcall_args
[25] test_cpp: thiscall
[26] test_cpp: exception in prehook
1 of 26 tests are failed.
ERROR

[kubo]

Thanks for your contribution.

I fixed it by another way.
See a9fc560, which uses C-preprocessor.

[redthing1]

Great!