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Commit | Line | Data |
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b53d1f41 MF |
1 | --- man5/elf.5 |
2 | +++ man5/elf.5 | |
3 | @@ -584,6 +584,11 @@ | |
4 | Values less than or equal to | |
5 | .Sy PT_LOPROC | |
6 | are reserved for processor-specific semantics. | |
7 | +.It PT_GNU_STACK | |
8 | +GNU extension which is used by the Linux kernel to control the state of the | |
9 | +stack via the flags set in the | |
10 | +.Sy p_flags | |
11 | +member. | |
12 | .El | |
13 | .Pp | |
14 | .It Dv p_offset | |
15 | @@ -606,7 +611,7 @@ | |
16 | This member holds the number of bytes in the memory image of the segment. | |
17 | It may be zero. | |
18 | .It Dv p_flags | |
19 | -This member holds flags relevant to the segment: | |
20 | +This member holds a bitmask of flags relevant to the segment: | |
21 | .Pp | |
22 | .Bl -tag -width "PF_X" -compact | |
23 | .It Dv PF_X | |
24 | @@ -998,6 +1003,25 @@ | |
25 | .Sy SHF_ALLOC | |
26 | and | |
27 | .Sy SHF_EXECINSTR . | |
28 | +.It .gnu.version | |
29 | +This section holds the version symbol table, an array of ElfN_Half elements. | |
30 | +This section is of type | |
31 | +.Sy SHT_GNU_versym . | |
32 | +The attribute type used is | |
33 | +.Sy SHF_ALLOC . | |
34 | +.It .gnu.version_d | |
35 | +This section holds the version symbol definitons, a table of ElfN_Verdef | |
36 | +structures. This section is of type | |
37 | +.Sy SHT_GNU_verdef . | |
38 | +The attribute type used is | |
39 | +.Sy SHF_ALLOC . | |
40 | +.It .gnu.version_r | |
41 | +This section holds the version symbol needed elements, a table of | |
42 | +ElfN_Verneed structures. This section is of | |
43 | +type | |
44 | +.Sy SHT_GNU_versym . | |
45 | +The attribute type used is | |
46 | +.Sy SHF_ALLOC . | |
47 | .It .got | |
48 | This section holds the global offset table. | |
49 | This section is of type | |
50 | @@ -1049,6 +1073,14 @@ | |
51 | .Sy .note.openbsd.ident | |
52 | section to identify themselves, for the kernel to bypass any compatibility | |
53 | ELF binary emulation tests when loading the file. | |
54 | +.It .note.GNU-stack | |
55 | +This section is used in Linux object files for declaring stack attributes. | |
56 | +This section is of type | |
57 | +.Sy SHT_PROGBITS . | |
58 | +The only attribute used is | |
59 | +.Sy SHF_EXECINSTR . | |
60 | +This indicates to the GNU linker that the object file requires an | |
61 | +executable stack. | |
62 | .It .plt | |
63 | This section holds the procedure linkage table. | |
64 | This section is of type | |
65 | @@ -1271,7 +1301,23 @@ | |
66 | .El | |
67 | .Pp | |
68 | .It Dv st_other | |
69 | -This member currently holds zero and has no defined meaning. | |
70 | +This member defines the symbol visibility. | |
71 | +.Bl -tag -width "STV_PROTECTED" | |
72 | +.It Dv STV_DEFAULT | |
73 | +Default symbol visibility rules. | |
74 | +.It Dv STV_INTERNAL | |
75 | +Processor specific hidden class. | |
76 | +.It Dv STV_HIDDEN | |
77 | +Symbol is unavailable in other modules. | |
78 | +.It Dv STV_PROTECTED | |
79 | +Not preemptible, not exported. | |
80 | +.Pp | |
81 | +There are macros for extracting the visibility type: | |
82 | +.Pp | |
83 | +.Fn ELF32_ST_VISIBILITY other | |
84 | +or | |
85 | +.Fn ELF64_ST_VISIBILITY other | |
86 | +.El | |
87 | .It Dv st_shndx | |
88 | Every symbol table entry is | |
89 | .Dq defined |