1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* Copyright (C) 2019 ARM Limited */ 3 #ifndef __TESTCASES_H__ 4 #define __TESTCASES_H__ 5 6 #include <stddef.h> 7 #include <stdio.h> 8 #include <stdbool.h> 9 #include <stdint.h> 10 #include <stdlib.h> 11 #include <ucontext.h> 12 #include <signal.h> 13 14 /* Architecture specific sigframe definitions */ 15 #include <asm/sigcontext.h> 16 17 #define FPSIMD_CTX (1 << 0) 18 #define SVE_CTX (1 << 1) 19 #define ZA_CTX (1 << 2) 20 #define EXTRA_CTX (1 << 3) 21 #define ZT_CTX (1 << 4) 22 #define FPMR_CTX (1 << 5) 23 24 #define KSFT_BAD_MAGIC 0xdeadbeef 25 26 #define HDR_SZ \ 27 sizeof(struct _aarch64_ctx) 28 29 #define GET_UC_RESV_HEAD(uc) \ 30 (struct _aarch64_ctx *)(&(uc->uc_mcontext.__reserved)) 31 32 #define GET_SF_RESV_HEAD(sf) \ 33 (struct _aarch64_ctx *)(&(sf).uc.uc_mcontext.__reserved) 34 35 #define GET_SF_RESV_SIZE(sf) \ 36 sizeof((sf).uc.uc_mcontext.__reserved) 37 38 #define GET_BUF_RESV_HEAD(buf) \ 39 (struct _aarch64_ctx *)(&(buf).uc.uc_mcontext.__reserved) 40 41 #define GET_BUF_RESV_SIZE(buf) \ 42 (sizeof(buf) - sizeof(buf.uc) + \ 43 sizeof((buf).uc.uc_mcontext.__reserved)) 44 45 #define GET_UCP_RESV_SIZE(ucp) \ 46 sizeof((ucp)->uc_mcontext.__reserved) 47 48 #define ASSERT_BAD_CONTEXT(uc) do { \ 49 char *err = NULL; \ 50 if (!validate_reserved((uc), GET_UCP_RESV_SIZE((uc)), &err)) { \ 51 if (err) \ 52 fprintf(stderr, \ 53 "Using badly built context - ERR: %s\n",\ 54 err); \ 55 } else { \ 56 abort(); \ 57 } \ 58 } while (0) 59 60 #define ASSERT_GOOD_CONTEXT(uc) do { \ 61 char *err = NULL; \ 62 if (!validate_reserved((uc), GET_UCP_RESV_SIZE((uc)), &err)) { \ 63 if (err) \ 64 fprintf(stderr, \ 65 "Detected BAD context - ERR: %s\n", err);\ 66 abort(); \ 67 } else { \ 68 fprintf(stderr, "uc context validated.\n"); \ 69 } \ 70 } while (0) 71 72 /* 73 * A simple record-walker for __reserved area: it walks through assuming 74 * only to find a proper struct __aarch64_ctx header descriptor. 75 * 76 * Instead it makes no assumptions on the content and ordering of the 77 * records, any needed bounds checking must be enforced by the caller 78 * if wanted: this way can be used by caller on any maliciously built bad 79 * contexts. 80 * 81 * head->size accounts both for payload and header _aarch64_ctx size ! 82 */ 83 #define GET_RESV_NEXT_HEAD(h) \ 84 (struct _aarch64_ctx *)((char *)(h) + (h)->size) 85 86 struct fake_sigframe { 87 siginfo_t info; 88 ucontext_t uc; 89 }; 90 91 92 bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err); 93 94 static inline struct _aarch64_ctx *get_header(struct _aarch64_ctx *head, uint32_t magic, 95 size_t resv_sz, size_t *offset) 96 { 97 size_t offs = 0; 98 struct _aarch64_ctx *found = NULL; 99 100 if (!head || resv_sz < HDR_SZ) 101 return found; 102 103 while (offs <= resv_sz - HDR_SZ && 104 head->magic != magic && head->magic) { 105 offs += head->size; 106 head = GET_RESV_NEXT_HEAD(head); 107 } 108 if (head->magic == magic) { 109 found = head; 110 if (offset) 111 *offset = offs; 112 } 113 114 return found; 115 } 116 117 118 static inline struct _aarch64_ctx *get_terminator(struct _aarch64_ctx *head, 119 size_t resv_sz, 120 size_t *offset) 121 { 122 return get_header(head, 0, resv_sz, offset); 123 } 124 125 static inline void write_terminator_record(struct _aarch64_ctx *tail) 126 { 127 if (tail) { 128 tail->magic = 0; 129 tail->size = 0; 130 } 131 } 132 133 struct _aarch64_ctx *get_starting_head(struct _aarch64_ctx *shead, 134 size_t need_sz, size_t resv_sz, 135 size_t *offset); 136 #endif 137