+/*
+ * The twolevel_hints_command contains the offset and number of hints in the
+ * two-level namespace lookup hints table.
+ */
+struct twolevel_hints_command {
+ uint32_t cmd; /* LC_TWOLEVEL_HINTS */
+ uint32_t cmdsize; /* sizeof(struct twolevel_hints_command) */
+ uint32_t offset; /* offset to the hint table */
+ uint32_t nhints; /* number of hints in the hint table */
+};
+
+/*
+ * The entries in the two-level namespace lookup hints table are twolevel_hint
+ * structs. These provide hints to the dynamic link editor where to start
+ * looking for an undefined symbol in a two-level namespace image. The
+ * isub_image field is an index into the sub-images (sub-frameworks and
+ * sub-umbrellas list) that made up the two-level image that the undefined
+ * symbol was found in when it was built by the static link editor. If
+ * isub-image is 0 the the symbol is expected to be defined in library and not
+ * in the sub-images. If isub-image is non-zero it is an index into the array
+ * of sub-images for the umbrella with the first index in the sub-images being
+ * 1. The array of sub-images is the ordered list of sub-images of the umbrella
+ * that would be searched for a symbol that has the umbrella recorded as its
+ * primary library. The table of contents index is an index into the
+ * library's table of contents. This is used as the starting point of the
+ * binary search or a directed linear search.
+ */
+struct twolevel_hint {
+ uint32_t
+ isub_image:8, /* index into the sub images */
+ itoc:24; /* index into the table of contents */
+};
+
+/*
+ * The prebind_cksum_command contains the value of the original check sum for
+ * prebound files or zero. When a prebound file is first created or modified
+ * for other than updating its prebinding information the value of the check sum
+ * is set to zero. When the file has it prebinding re-done and if the value of
+ * the check sum is zero the original check sum is calculated and stored in
+ * cksum field of this load command in the output file. If when the prebinding
+ * is re-done and the cksum field is non-zero it is left unchanged from the
+ * input file.
+ */
+struct prebind_cksum_command {
+ uint32_t cmd; /* LC_PREBIND_CKSUM */
+ uint32_t cmdsize; /* sizeof(struct prebind_cksum_command) */
+ uint32_t cksum; /* the check sum or zero */
+};
+
+/*
+ * The uuid load command contains a single 128-bit unique random number that
+ * identifies an object produced by the static link editor.
+ */
+struct uuid_command {
+ uint32_t cmd; /* LC_UUID */
+ uint32_t cmdsize; /* sizeof(struct uuid_command) */
+ uint8_t uuid[16]; /* the 128-bit uuid */
+};
+
+/*
+ * The rpath_command contains a path which at runtime should be added to
+ * the current run path used to find @rpath prefixed dylibs.
+ */
+struct rpath_command {
+ uint32_t cmd; /* LC_RPATH */
+ uint32_t cmdsize; /* includes string */
+ union lc_str path; /* path to add to run path */
+};
+
+/*
+ * The linkedit_data_command contains the offsets and sizes of a blob
+ * of data in the __LINKEDIT segment.
+ */
+struct linkedit_data_command {
+ uint32_t cmd; /* LC_CODE_SIGNATURE or LC_SEGMENT_SPLIT_INFO */
+ uint32_t cmdsize; /* sizeof(struct linkedit_data_command) */
+ uint32_t dataoff; /* file offset of data in __LINKEDIT segment */
+ uint32_t datasize; /* file size of data in __LINKEDIT segment */
+};
+
+/*
+ * The encryption_info_command contains the file offset and size of an
+ * of an encrypted segment.
+ */
+struct encryption_info_command {
+ uint32_t cmd; /* LC_ENCRYPTION_INFO */
+ uint32_t cmdsize; /* sizeof(struct encryption_info_command) */
+ uint32_t cryptoff; /* file offset of encrypted range */
+ uint32_t cryptsize; /* file size of encrypted range */
+ uint32_t cryptid; /* which enryption system,
+ 0 means not-encrypted yet */
+};
+
projects / apple / xnu.git / blobdiff