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authorLinus Torvalds <torvalds@linux-foundation.org>2021-01-31 11:48:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-01-31 11:48:12 -0800
commitf5a376eddec424f00e38aa19bd26c2febbfc934d (patch)
tree8bead178bea50804794386fa777f8ed3d78d758f /Documentation
parent17b756d0376fd45f98abb6d758c3d5befb01e3fa (diff)
parent0bab9cb2d980d7c075cffb9216155f7835237f98 (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.rst5
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