src/ucontext/arm64/asm_help.h

   1 /*
   2  * Copyright (c) 2020 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /* ASM Macro helpers */
  25 #if defined(__ASSEMBLER__)
  26
  27 .macro ARM64_STACK_PROLOG
  28 #if __has_feature(ptrauth_returns)
  29         pacibsp
  30 #endif
  31 .endmacro
  32
  33 .macro ARM64_STACK_EPILOG
  34 #if __has_feature(ptrauth_returns)
  35         retab
  36 #else
  37         ret
  38 #endif
  39 .endmacro
  40
  41 #define PUSH_FRAME                      \
  42         stp fp, lr, [sp, #-16]!         %% \
  43         mov fp, sp                      %%
  44
  45 #define POP_FRAME                       \
  46         mov sp, fp                      %% \
  47         ldp fp, lr, [sp], #16           %%
  48 #endif /* ASSEMBLER */
  49
  50 /* Offsets of the various register states inside of the mcontext data */
  51 #define MCONTEXT_OFFSET_X0 16
  52
  53 #define MCONTEXT_OFFSET_X19_X20 168
  54 #define MCONTEXT_OFFSET_X21_X22 184
  55 #define MCONTEXT_OFFSET_X23_X24 200
  56
  57 #define MCONTEXT_OFFSET_X25_X26 216
  58 #define MCONTEXT_OFFSET_X27_X28 232
  59
  60 #define MCONTEXT_OFFSET_FP_LR 248
  61 #define MCONTEXT_OFFSET_SP 264
  62 #define MCONTEXT_OFFSET_FLAGS 284
  63
  64 #define MCONTEXT_OFFSET_D8 424
  65 #define MCONTEXT_OFFSET_D9 440
  66 #define MCONTEXT_OFFSET_D10 456
  67 #define MCONTEXT_OFFSET_D11 472
  68 #define MCONTEXT_OFFSET_D12 488
  69 #define MCONTEXT_OFFSET_D13 504
  70 #define MCONTEXT_OFFSET_D14 520
  71 #define MCONTEXT_OFFSET_D15 536
  72
  73 #if __has_feature(ptrauth_calls)
  74 #define LR_SIGNED_WITH_IB 0x2 /* Copied from __DARWIN_ARM_THREAD_STATE64_FLAGS_IB_SIGNED_LR */
  75 #define LR_SIGNED_WITH_IB_BIT 0x1
  76 #endif