1 /* 2 * Copyright (c) 2014-2018, Intel Corporation 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * * Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * * Neither the name of Intel Corporation nor the names of its contributors 13 * may be used to endorse or promote products derived from this software 14 * without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef PT_MAPPED_SECTION_H 30 #define PT_MAPPED_SECTION_H 31 32 #include "intel-pt.h" 33 #include "pt_section.h" 34 35 #include <stdint.h> 36 37 38 /* A section mapped into memory. */ 39 struct pt_mapped_section { 40 /* The section that is mapped. */ 41 struct pt_section *section; 42 43 /* The address space into which the section is mapped. */ 44 struct pt_asid asid; 45 46 /* The virtual address at which the section is mapped. */ 47 uint64_t vaddr; 48 49 /* The offset into the section. 50 * 51 * This is normally zero but when @section is split, @offset is added to 52 * the section/file offset when accessing @section. 53 */ 54 uint64_t offset; 55 56 /* The size of the section. 57 * 58 * This is normally @section->size but when @section is split, this is 59 * used to determine the size of the sub-section. 60 */ 61 uint64_t size; 62 }; 63 64 65 static inline void pt_msec_init(struct pt_mapped_section *msec, 66 struct pt_section *section, 67 const struct pt_asid *asid, 68 uint64_t vaddr, uint64_t offset, uint64_t size) 69 { 70 if (!msec) 71 return; 72 73 msec->section = section; 74 msec->vaddr = vaddr; 75 msec->offset = offset; 76 msec->size = size; 77 78 if (asid) 79 msec->asid = *asid; 80 else 81 pt_asid_init(&msec->asid); 82 } 83 84 /* Destroy a mapped section - does not free @msec->section. */ 85 static inline void pt_msec_fini(struct pt_mapped_section *msec) 86 { 87 (void) msec; 88 89 /* Nothing to do. */ 90 } 91 92 /* Return the virtual address of the beginning of the memory region. */ 93 static inline uint64_t pt_msec_begin(const struct pt_mapped_section *msec) 94 { 95 if (!msec) 96 return 0ull; 97 98 return msec->vaddr; 99 } 100 101 /* Return the virtual address one byte past the end of the memory region. */ 102 static inline uint64_t pt_msec_end(const struct pt_mapped_section *msec) 103 { 104 if (!msec) 105 return 0ull; 106 107 return msec->vaddr + msec->size; 108 } 109 110 /* Return the section/file offset. */ 111 static inline uint64_t pt_msec_offset(const struct pt_mapped_section *msec) 112 { 113 if (!msec) 114 return 0ull; 115 116 return msec->offset; 117 } 118 119 /* Return the section size. */ 120 static inline uint64_t pt_msec_size(const struct pt_mapped_section *msec) 121 { 122 if (!msec) 123 return 0ull; 124 125 return msec->size; 126 } 127 128 /* Return the underlying section. */ 129 static inline struct pt_section * 130 pt_msec_section(const struct pt_mapped_section *msec) 131 { 132 return msec->section; 133 } 134 135 /* Return an identifier for the address-space the section is mapped into. */ 136 static inline const struct pt_asid * 137 pt_msec_asid(const struct pt_mapped_section *msec) 138 { 139 if (!msec) 140 return NULL; 141 142 return &msec->asid; 143 } 144 145 /* Translate a section/file offset into a virtual address. */ 146 static inline uint64_t pt_msec_map(const struct pt_mapped_section *msec, 147 uint64_t offset) 148 { 149 return (offset - msec->offset) + msec->vaddr; 150 } 151 152 /* Translate a virtual address into a section/file offset. */ 153 static inline uint64_t pt_msec_unmap(const struct pt_mapped_section *msec, 154 uint64_t vaddr) 155 { 156 return (vaddr - msec->vaddr) + msec->offset; 157 } 158 159 /* Read memory from a mapped section. 160 * 161 * The caller must check @msec->asid. 162 * The caller must ensure that @msec->section is mapped. 163 * 164 * Returns the number of bytes read on success. 165 * Returns a negative error code otherwise. 166 */ 167 static inline int pt_msec_read(const struct pt_mapped_section *msec, 168 uint8_t *buffer, uint16_t size, 169 uint64_t vaddr) 170 { 171 struct pt_section *section; 172 uint64_t begin, end, mbegin, mend, offset; 173 174 if (!msec) 175 return -pte_internal; 176 177 begin = vaddr; 178 end = begin + size; 179 if (end < begin) 180 end = UINT64_MAX; 181 182 mbegin = pt_msec_begin(msec); 183 mend = pt_msec_end(msec); 184 185 if (begin < mbegin || mend <= begin) 186 return -pte_nomap; 187 188 if (mend < end) 189 end = mend; 190 191 size = (uint16_t) (end - begin); 192 193 section = pt_msec_section(msec); 194 offset = pt_msec_unmap(msec, begin); 195 196 return pt_section_read(section, buffer, size, offset); 197 } 198 199 #endif /* PT_MAPPED_SECTION_H */ 200