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Document differences between TLS coding in ELF32 and ELF64

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Absolute relocation wrt ..tlsie for ELF32
Relative relocation wrt ..gottpoff for ELF64
This commit is contained in:
Charles Crayne 2008-11-01 17:09:36 -07:00
parent 5fb6a39bc9
commit 81afb49809
1 changed files with 10 additions and 2 deletions
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doc/nasmdoc.src
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@ -5397,9 +5397,18 @@ shared libraries entirely in NASM is given in \k{picdll}.
\S{elftls} \i{Thread Local Storage}\I{TLS}: \c{elf} Special
Symbols and \i\c{WRT}
\b In ELF32 mode, referring to an external or global symbol using
\c{wrt ..tlsie} \I\c{..tlsie}
causes the linker to build an entry \e{in} the GOT containing the
offset of the symbol within the TLS block, so you can access the value
of the symbol with code such as:
\c mov eax,[tid wrt ..tlsie]
\c mov dword [gs:eax],ebx
\b Referring to an external or global symbol using \c{wrt ..gottpoff} \I\c{..gottpoff}
\b In ELF64 mode, referring to an external or global symbol using
\c{wrt ..gottpoff} \I\c{..gottpoff}
causes the linker to build an entry \e{in} the GOT containing the
offset of the symbol within the TLS block, so you can access the value
of the symbol with code such as:
@ -5407,7 +5416,6 @@ of the symbol with code such as:
\c mov rax,[rel tid wrt ..gottpoff]
\c mov rcx, [fs:rax]
(Please note that this feature is currently implemented only for ELF64.)
\S{elfglob} \c{elf} Extensions to the \c{GLOBAL} Directive\I{GLOBAL,
elf extensions to}\I{GLOBAL, aoutb extensions to}