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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-01-31 11:48:12 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-01-31 11:48:12 -0800 |
| commit | f5a376eddec424f00e38aa19bd26c2febbfc934d (patch) | |
| tree | 8bead178bea50804794386fa777f8ed3d78d758f /Documentation | |
| parent | 17b756d0376fd45f98abb6d758c3d5befb01e3fa (diff) | |
| parent | 0bab9cb2d980d7c075cffb9216155f7835237f98 (diff) | |
Merge tag 'x86_entry_for_v5.11_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Borislav Petkov:
"A single fix for objtool to generate proper unwind info for newer
toolchains which do not generate section symbols anymore. And a
cleanup ontop.
This was originally going to go during the next merge window but
people can already trigger a build error with binutils-2.36 which
doesn't emit section symbols - something which objtool relies on - so
let's expedite it"
* tag 'x86_entry_for_v5.11_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/entry: Remove put_ret_addr_in_rdi THUNK macro argument
x86/entry: Emit a symbol for register restoring thunk
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/asm-annotations.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/asm-annotations.rst b/Documentation/asm-annotations.rst index 32ea57483378..76424e0431f4 100644 --- a/Documentation/asm-annotations.rst +++ b/Documentation/asm-annotations.rst @@ -100,6 +100,11 @@ Instruction Macros ~~~~~~~~~~~~~~~~~~ This section covers ``SYM_FUNC_*`` and ``SYM_CODE_*`` enumerated above. +``objtool`` requires that all code must be contained in an ELF symbol. Symbol +names that have a ``.L`` prefix do not emit symbol table entries. ``.L`` +prefixed symbols can be used within a code region, but should be avoided for +denoting a range of code via ``SYM_*_START/END`` annotations. + * ``SYM_FUNC_START`` and ``SYM_FUNC_START_LOCAL`` are supposed to be **the most frequent markings**. They are used for functions with standard calling conventions -- global and local. Like in C, they both align the functions to |