1/* 2 * Copyright (c) 2017 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29#include <arm64/asm.h> 30 31#if ALTERNATE_DEBUGGER 32 .text 33/* void alternate_debugger_just_return(__unused mach_vm_size_t size, __unused mach_vm_address_t pages, __unused mach_vm_size_t pages_size, t_putc_fn putc_address) */ 34 .align 2 35 .globl EXT(alternate_debugger_just_return) 36LEXT(alternate_debugger_just_return) 37 ARM64_PROLOG 38 sub sp, sp, #0x20 39 stp x29, x30, [sp, #0x10] 40 add x29, sp, #0x10 41 str x3, [sp, #0x8] 42 mov w0, #0xa 43 mov x1, x3 44 blr x1 // (*putc_address)('\n'); 45 orr w0, wzr, #0x3e 46 ldr x1, [sp, #0x8] 47 blr x1 // (*putc_address)('>'); 48 mov w0, #0x4d 49 ldr x1, [sp, #0x8] 50 blr x1 // (*putc_address)('M'); 51 mov w0, #0x54 52 ldr x1, [sp, #0x8] 53 blr x1 // (*putc_address)('T'); 54 orr w0, wzr, #0x3c 55 ldr x1, [sp, #0x8] 56 blr x1 // (*putc_address)('<'); 57 mov w0, #0xa 58 ldr x16, [sp, #0x8] 59 ldp x29, x30, [sp, #0x10] 60 add sp, sp, #0x20 61 /* BTI calling convention requires tail calls use x16/x17 */ 62 br x16 // (*putc_address)('\n'); 63 .align 2 64 .globl EXT(alternate_debugger_just_return_end) 65LEXT(alternate_debugger_just_return_end) 66 67#endif /* ALTERNATE_DEBUGGER */ 68