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