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_IWMMXT 47 /* iwmmxt_area is 0x98 bytes long, preceded by 8 bytes of signature */ 48 #define IWMMXT_MAGIC 0x12ef842a 49 #define IWMMXT_STORAGE_SIZE (IWMMXT_SIZE + 8) 50 51 struct iwmmxt_sigframe { 52 unsigned long magic; 53 unsigned long size; 54 struct iwmmxt_struct storage; 55 } __attribute__((__aligned__(8))); 56 #endif /* CONFIG_IWMMXT */ 57 58 #ifdef CONFIG_VFP 59 #define VFP_MAGIC 0x56465001 60 61 struct vfp_sigframe 62 { 63 unsigned long magic; 64 unsigned long size; 65 struct user_vfp ufp; 66 struct user_vfp_exc ufp_exc; 67 } __attribute__((__aligned__(8))); 68 69 /* 70 * 8 byte for magic and size, 264 byte for ufp, 12 bytes for ufp_exc, 71 * 4 bytes padding. 72 */ 73 #define VFP_STORAGE_SIZE sizeof(struct vfp_sigframe) 74 75 #endif /* CONFIG_VFP */ 76 77 /* 78 * Auxiliary signal frame. This saves stuff like FP state. 79 * The layout of this structure is not part of the user ABI, 80 * because the config options aren't. uc_regspace is really 81 * one of these. 82 */ 83 struct aux_sigframe { 84 #ifdef CONFIG_IWMMXT 85 struct iwmmxt_sigframe iwmmxt; 86 #endif 87 #ifdef CONFIG_VFP 88 struct vfp_sigframe vfp; 89 #endif 90 /* Something that isn't a valid magic number for any coprocessor. */ 91 unsigned long end_magic; 92 } __attribute__((__aligned__(8))); 93 94 #endif 95 96 #endif /* !_ASMARM_UCONTEXT_H */ 97