arch/arm64/include/asm/sigcontext.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_SIGCONTEXT_H
  17 #define __ASM_SIGCONTEXT_H
  18
  19 #include <linux/types.h>
  20
  21 /*
  22  * Signal context structure - contains all info to do with the state
  23  * before the signal handler was invoked.
  24  */
  25 struct sigcontext {
  26         __u64 fault_address;
  27         /* AArch64 registers */
  28         __u64 regs[31];
  29         __u64 sp;
  30         __u64 pc;
  31         __u64 pstate;
  32         /* 4K reserved for FP/SIMD state and future expansion */
  33         __u8 __reserved[4096] __attribute__((__aligned__(16)));
  34 };
  35
  36 /*
  37  * Header to be used at the beginning of structures extending the user
  38  * context. Such structures must be placed after the rt_sigframe on the stack
  39  * and be 16-byte aligned. The last structure must be a dummy one with the
  40  * magic and size set to 0.
  41  */
  42 struct _aarch64_ctx {
  43         __u32 magic;
  44         __u32 size;
  45 };
  46
  47 #define FPSIMD_MAGIC    0x46508001
  48
  49 struct fpsimd_context {
  50         struct _aarch64_ctx head;
  51         __u32 fpsr;
  52         __u32 fpcr;
  53         __uint128_t vregs[32];
  54 };
  55
  56 #ifdef __KERNEL__
  57 /*
  58  * Auxiliary context saved in the sigcontext.__reserved array. Not exported to
  59  * user space as it will change with the addition of new context. User space
  60  * should check the magic/size information.
  61  */
  62 struct aux_context {
  63         struct fpsimd_context fpsimd;
  64         /* additional context to be added before "end" */
  65         struct _aarch64_ctx end;
  66 };
  67 #endif
  68
  69 #endif