Cider Isn't Darwin Emulation, Really
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130.text.globl __darling_bsd_syscall.private_extern __darling_bsd_syscall#if defined(__x86_64__)__darling_bsd_syscall:Lentry_hook: .space 13, 0x90 movq ___bsd_syscall_table@GOTPCREL(%rip), %r10 movq (%r10,%rax,8), %r10 test %r10, %r10 jz .no_sys # Re-push possible 7th and 8th arg movq 24(%rsp), %r11 pushq %r11 movq 24(%rsp), %r11 pushq %r11 call *%r10 addq $16, %rsp.std_ret:Lexit_hook: .space 13, 0x90 ret.no_sys: movq %rax, %rdi call ___unknown_syscall jmp .std_ret.section __DATA,__data.globl __darling_bsd_syscall_entry.globl __darling_bsd_syscall_exit__darling_bsd_syscall_entry: .quad Lentry_hook__darling_bsd_syscall_exit: .quad Lexit_hook#elif defined(__i386__)#define copy_arg(off) \ movl 8+off(%esp), %ecx ;\ movl %ecx, -56+off(%esp)__darling_bsd_syscall:Lentry_hook: .space 6, 0x90 calll 1f1: popl %ecx2: movl L___bsd_syscall_table$non_lazy_ptr-1b(%ecx), %ecx andl $0xffff, %eax // Because there is some extra stuff in upper bytes we don't need movl (%ecx,%eax,4), %eax test %eax, %eax jz .no_sys // Copy arguments copy_arg(0) copy_arg(4) copy_arg(8) copy_arg(12) copy_arg(16) copy_arg(20) copy_arg(24) copy_arg(28) copy_arg(32) copy_arg(36) copy_arg(40) copy_arg(44) copy_arg(48) copy_arg(52) subl $56, %esp call *%eax addl $56, %esp.std_ret:Lexit_hook: .space 6, 0x90 ret.no_sys: pushl %ecx call ___unknown_syscall addl $4, %esp jmp .std_ret .section __IMPORT,__pointers,non_lazy_symbol_pointersL___bsd_syscall_table$non_lazy_ptr: .indirect_symbol ___bsd_syscall_table .long 0.section __DATA,__data.globl __darling_bsd_syscall_entry.globl __darling_bsd_syscall_exit__darling_bsd_syscall_entry: .long Lentry_hook__darling_bsd_syscall_exit: .long Lexit_hook.subsections_via_symbols#elif __arm64__; https://stackoverflow.com/a/56993314/5988706__darling_bsd_syscall:Lentry_hook: lsl x9,x16,3 ; x9 = syscall_number << 3 // (syscall_number * 8) adrp x10,___bsd_syscall_table@PAGE add x10,x10,___bsd_syscall_table@PAGEOFF add x10,x9,x10 ; x10 = __bsd_syscall_table + x9 ldr x9,[x10] ; x9 = *(x10) cbz x9, .no_sys blr x9.std_ret:Lexit_hook: ret.no_sys: bl ___unknown_syscall b .std_ret.section __DATA,__data.globl __darling_bsd_syscall_entry.globl __darling_bsd_syscall_exit__darling_bsd_syscall_entry: .quad Lentry_hook__darling_bsd_syscall_exit: .quad Lexit_hook#else# error Missing assembly#endif