osfmk/arm64/alternate_debugger_asm.s

   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)
  36 LEXT(alternate_debugger_just_return)
  37         sub             sp, sp, #0x20
  38         stp             x29, x30, [sp, #0x10]
  39         add             x29, sp, #0x10
  40         str             x3, [sp, #0x8]
  41         mov             w0, #0xa
  42         mov             x1, x3
  43         blr             x1                              // (*putc_address)('\n');
  44         orr             w0, wzr, #0x3e
  45         ldr             x1, [sp, #0x8]
  46         blr             x1                              // (*putc_address)('>');
  47         mov             w0, #0x4d
  48         ldr             x1, [sp, #0x8]
  49         blr             x1                              // (*putc_address)('M');
  50         mov             w0, #0x54
  51         ldr             x1, [sp, #0x8]
  52         blr             x1                              // (*putc_address)('T');
  53         orr             w0, wzr, #0x3c
  54         ldr             x1, [sp, #0x8]
  55         blr             x1                              // (*putc_address)('<');
  56         mov             w0, #0xa
  57         ldr             x1, [sp, #0x8]
  58         ldp             x29, x30, [sp, #0x10]
  59         add             sp, sp, #0x20
  60         br              x1                              // (*putc_address)('\n');
  61         .align 2
  62         .globl EXT(alternate_debugger_just_return_end)
  63 LEXT(alternate_debugger_just_return_end)
  64
  65 #endif /* ALTERNATE_DEBUGGER */