1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASMARM_UCONTEXT_H 3 #define _ASMARM_UCONTEXT_H 4 5 #include <asm/fpstate.h> 6 #include <asm/user.h> 7 8 /* 9 * struct sigcontext only has room for the basic registers, but struct 10 * ucontext now has room for all registers which need to be saved and 11 * restored. Coprocessor registers are stored in uc_regspace. Each 12 * coprocessor's saved state should start with a documented 32-bit magic 13 * number, followed by a 32-bit word giving the coproccesor's saved size. 14 * uc_regspace may be expanded if necessary, although this takes some 15 * coordination with glibc. 16 */ 17 18 struct ucontext { 19 unsigned long uc_flags; 20 struct ucontext *uc_link; 21 stack_t uc_stack; 22 struct sigcontext uc_mcontext; 23 sigset_t uc_sigmask; 24 /* Allow for uc_sigmask growth. Glibc uses a 1024-bit sigset_t. */ 25 int __unused[32 - (sizeof (sigset_t) / sizeof (int))]; 26 /* Last for extensibility. Eight byte aligned because some 27 coprocessors require eight byte alignment. */ 28 unsigned long uc_regspace[128] __attribute__((__aligned__(8))); 29 }; 30 31 #ifdef __KERNEL__ 32 33 /* 34 * Coprocessor save state. The magic values and specific 35 * coprocessor's layouts are part of the userspace ABI. Each one of 36 * these should be a multiple of eight bytes and aligned to eight 37 * bytes, to prevent unpredictable padding in the signal frame. 38 */ 39 40 /* 41 * Dummy padding block: if this magic is encountered, the block should 42 * be skipped using the corresponding size field. 43 */ 44 #define DUMMY_MAGIC 0xb0d9ed01 45 46 #ifdef CONFIG_CRUNCH 47 #define CRUNCH_MAGIC 0x5065cf03 48 #define CRUNCH_STORAGE_SIZE (CRUNCH_SIZE + 8) 49 50 struct crunch_sigframe { 51 unsigned long magic; 52 unsigned long size; 53 struct crunch_state storage; 54 } __attribute__((__aligned__(8))); 55 #endif 56 57 #ifdef CONFIG_IWMMXT 58 /* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */ 59 #define IWMMXT_MAGIC 0x12ef842a 60 #define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8) 61 62 struct iwmmxt_sigframe { 63 unsigned long magic; 64 unsigned long size; 65 struct iwmmxt_struct storage; 66 } __attribute__((__aligned__(8))); 67 #endif /* CONFIG_IWMMXT */ 68 69 #ifdef CONFIG_VFP 70 #define VFP_MAGIC 0x56465001 71 72 struct vfp_sigframe 73 { 74 unsigned long magic; 75 unsigned long size; 76 struct user_vfp ufp; 77 struct user_vfp_exc ufp_exc; 78 } __attribute__((__aligned__(8))); 79 80 /* 81 * 8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc, 82 * 4 bytes padding. 83 */ 84 #define VFP_STORAGE_SIZE sizeof(struct vfp_sigframe) 85 86 #endif /* CONFIG_VFP */ 87 88 /* 89 * Auxiliary signal frame. This saves stuff like FP state. 90 * The layout of this structure is not part of the user ABI, 91 * because the config options aren't. uc_regspace is really 92 * one of these. 93 */ 94 struct aux_sigframe { 95 #ifdef CONFIG_CRUNCH 96 struct crunch_sigframe crunch; 97 #endif 98 #ifdef CONFIG_IWMMXT 99 struct iwmmxt_sigframe iwmmxt; 100 #endif 101 #ifdef CONFIG_VFP 102 struct vfp_sigframe vfp; 103 #endif 104 /* Something that isn't a valid magic number for any coprocessor. */ 105 unsigned long end_magic; 106 } __attribute__((__aligned__(8))); 107 108 #endif 109 110 #endif /* !_ASMARM_UCONTEXT_H */ 111
