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Diffstat (limited to 'gas/doc/c-aarch64.texi')
| -rw-r--r-- | gas/doc/c-aarch64.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gas/doc/c-aarch64.texi b/gas/doc/c-aarch64.texi index f38fdf5..ca84c9d 100644 --- a/gas/doc/c-aarch64.texi +++ b/gas/doc/c-aarch64.texi @@ -435,6 +435,14 @@ as the @code{.dword} directive. @c YYYYYYYYYYYYYYYYYYYYYYYYYY @c ZZZZZZZZZZZZZZZZZZZZZZZZZZ +@cindex @code{.cfi_b_key_frame} directive, AArch64 +@item @code{.cfi_b_key_frame} +The @code{.cfi_b_key_frame} directive inserts a 'B' character into the CIE +corresponding to the current frame's FDE, meaning that its return address has +been signed with the B-key. If two frames are signed with differing keys then +they will not share the same CIE. This information is intended to be used by +the stack unwinder in order to properly authenticate return addresses. + @end table @node AArch64 Opcodes |