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| author | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2023-09-26 16:27:38 +0100 |
|---|---|---|
| committer | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2023-09-26 16:37:38 +0100 |
| commit | e1e18ea0defe9e1ee35abbbe5279028ecf786957 (patch) | |
| tree | 9ae3a5fe67b073416bfe81efdf96ebbefc7af3ff /libgcc | |
| parent | c3c6f30496d945b77dcb7f4ad8c3f8094f5a64a4 (diff) | |
| download | gcc-e1e18ea0defe9e1ee35abbbe5279028ecf786957.zip gcc-e1e18ea0defe9e1ee35abbbe5279028ecf786957.tar.gz gcc-e1e18ea0defe9e1ee35abbbe5279028ecf786957.tar.bz2 | |
AArch64: Remove BTI from outline atomics
The outline atomic functions have hidden visibility and can only be called
directly. Therefore we can remove the BTI at function entry. This improves
security by reducing the number of indirect entry points in a binary.
The BTI markings on the objects are still emitted.
libgcc/ChangeLog:
* config/aarch64/lse.S (BTI_C): Remove define.
Diffstat (limited to 'libgcc')
| -rw-r--r-- | libgcc/config/aarch64/lse.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libgcc/config/aarch64/lse.S b/libgcc/config/aarch64/lse.S index dde3a28..f64a3e9 100644 --- a/libgcc/config/aarch64/lse.S +++ b/libgcc/config/aarch64/lse.S @@ -46,6 +46,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see * direct branch. The choice of LSE vs non-LSE is done via one byte load * followed by a well-predicted direct branch. The functions are compiled * separately to minimize code size. + * + * Since these functions have hidden visibility and are never called + * indirectly, they do not need to start with a BTI instruction. */ #include "auto-target.h" @@ -161,8 +164,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see #define tmp1 17 #define tmp2 15 -#define BTI_C hint 34 - /* Start and end a function. */ .macro STARTFN name .text @@ -172,7 +173,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see .type \name, %function .cfi_startproc \name: - BTI_C .endm .macro ENDFN name |