| ... | ... | @@ -1912,3 +1912,90 @@ pub const LoadCommandIterator = struct { |
| 1912 | 1912 | return cmd; |
| 1913 | 1913 | } |
| 1914 | 1914 | }; |
| 1915 | |
| 1916 | pub const compact_unwind_encoding_t = u32; |
| 1917 | |
| 1918 | // Relocatable object files: __LD,__compact_unwind |
| 1919 | |
| 1920 | pub const compact_unwind_entry = extern struct { |
| 1921 | rangeStart: u64, |
| 1922 | rangeLength: u32, |
| 1923 | compactUnwindEncoding: u32, |
| 1924 | personalityFunction: u64, |
| 1925 | lsda: u64, |
| 1926 | }; |
| 1927 | |
| 1928 | // Final linked images: __TEXT,__unwind_info |
| 1929 | // The __TEXT,__unwind_info section is laid out for an efficient two level lookup. |
| 1930 | // The header of the section contains a coarse index that maps function address |
| 1931 | // to the page (4096 byte block) containing the unwind info for that function. |
| 1932 | |
| 1933 | pub const UNWIND_SECTION_VERSION = 1; |
| 1934 | pub const UNWIND_SECOND_LEVEL_REGULAR = 2; |
| 1935 | pub const UNWIND_SECOND_LEVEL_COMPRESSED = 3; |
| 1936 | |
| 1937 | pub const unwind_info_section_header = extern struct { |
| 1938 | /// UNWIND_SECTION_VERSION |
| 1939 | version: u32 = UNWIND_SECTION_VERSION, |
| 1940 | commonEncodingsArraySectionOffset: u32, |
| 1941 | commonEncodingsArrayCount: u32, |
| 1942 | personalityArraySectionOffset: u32, |
| 1943 | personalityArrayCount: u32, |
| 1944 | indexSectionOffset: u32, |
| 1945 | indexCount: u32, |
| 1946 | // compact_unwind_encoding_t[] |
| 1947 | // uint32_t personalities[] |
| 1948 | // unwind_info_section_header_index_entry[] |
| 1949 | // unwind_info_section_header_lsda_index_entry[] |
| 1950 | }; |
| 1951 | |
| 1952 | pub const unwind_info_section_header_index_entry = extern struct { |
| 1953 | functionOffset: u32, |
| 1954 | |
| 1955 | /// section offset to start of regular or compress page |
| 1956 | secondLevelPagesSectionOffset: u32, |
| 1957 | |
| 1958 | /// section offset to start of lsda_index array for this range |
| 1959 | lsdaIndexArraySectionOffset: u32, |
| 1960 | }; |
| 1961 | |
| 1962 | pub const unwind_info_section_header_lsda_index_entry = extern struct { |
| 1963 | functionOffset: u32, |
| 1964 | lsdaOffset: u32, |
| 1965 | }; |
| 1966 | |
| 1967 | // There are two kinds of second level index pages: regular and compressed. |
| 1968 | // A compressed page can hold up to 1021 entries, but it cannot be used if |
| 1969 | // too many different encoding types are used. The regular page holds 511 |
| 1970 | // entries. |
| 1971 | |
| 1972 | pub const unwind_info_regular_second_level_entry = extern struct { |
| 1973 | functionOffset: u32, |
| 1974 | encoding: compact_unwind_encoding_t, |
| 1975 | }; |
| 1976 | |
| 1977 | pub const unwind_info_regular_second_level_page_header = extern struct { |
| 1978 | /// UNWIND_SECOND_LEVEL_REGULAR |
| 1979 | kind: u32 = UNWIND_SECOND_LEVEL_REGULAR, |
| 1980 | |
| 1981 | entryPageOffset: u16, |
| 1982 | entryCount: u16, |
| 1983 | // entry array |
| 1984 | }; |
| 1985 | |
| 1986 | pub const unwind_info_compressed_second_level_page_header = extern struct { |
| 1987 | /// UNWIND_SECOND_LEVEL_COMPRESSED |
| 1988 | kind: u32 = UNWIND_SECOND_LEVEL_COMPRESSED, |
| 1989 | |
| 1990 | entryPageOffset: u16, |
| 1991 | entryCount: u16, |
| 1992 | encodingsPageOffset: u16, |
| 1993 | encodingsCount: u16, |
| 1994 | // 32bit entry array |
| 1995 | // encodings array |
| 1996 | }; |
| 1997 | |
| 1998 | pub const UnwindInfoCompressedEntry = packed struct(u32) { |
| 1999 | funcOffset: u24, |
| 2000 | encodingIndex: u8, |
| 2001 | }; |
Jakub Konka <kubkon@jakubkonka.com> 2022-12-20 11:57:14+01:00
Andrew Kelley <andrew@ziglang.org> 2023-01-09 15:09:52-07:00
lib