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| author | Srinath Parvathaneni <srinath.parvathaneni@arm.com> | 2024-10-28 18:13:08 +0000 |
|---|---|---|
| committer | Matthieu Longo <matthieu.longo@arm.com> | 2024-12-02 15:18:41 +0000 |
| commit | b75ce33f0cd3a4720c252969bfffdac4f3f998a7 (patch) | |
| tree | c6b6bc86e2d9ec80faf89d4681dba660080a4830 /include | |
| parent | f1cd84f4c55f3b361cb219f625a397ee039ad0d2 (diff) | |
| download | gdb-b75ce33f0cd3a4720c252969bfffdac4f3f998a7.zip gdb-b75ce33f0cd3a4720c252969bfffdac4f3f998a7.tar.gz gdb-b75ce33f0cd3a4720c252969bfffdac4f3f998a7.tar.bz2 | |
aarch64: GCS feature check in GNU note properties for input objects
This patch adds support for Guarded Control Stack in AArch64 linker.
This patch implements the following:
1) Defines GNU_PROPERTY_AARCH64_FEATURE_1_GCS bit for GCS in
GNU_PROPERTY_AARCH64_FEATURE_1_AND macro.
2) Adds readelf support to read and print the GCS feature in GNU
properties in AArch64.
Displaying notes found in: .note.gnu.property
[ ]+Owner[ ]+Data size[ ]+Description
GNU 0x00000010 NT_GNU_PROPERTY_TYPE_0
Properties: AArch64 feature: GCS
3) Adds support for the "-z gcs" linker option and document all the values
allowed with this option (-z gcs[=always|never|implicit]) where "-z gcs" is
equivalent to "-z gcs=always". When '-z gcs' option is omitted from the
command line, it defaults to "implicit" and relies on the GCS feature
marking in GNU properties.
4) Adds support for the "-z gcs-report" linker option and document all the
values allowed with this option (-z gcs-report[=none|warning|error]) where
"-z gcs-report" is equivalent to "-z gcs-report=warning". When this option
is omitted from the command line, it defaults to "warning".
The ABI changes adding GNU_PROPERTY_AARCH64_FEATURE_1_GCS to the GNU
property GNU_PROPERTY_AARCH64_FEATURE_1_AND is merged into main and
can be found in [1].
[1] https://github.com/ARM-software/abi-aa/blob/main/sysvabi64/sysvabi64.rst
Co-authored-by: Matthieu Longo <matthieu.longo@arm.com>
Co-authored-by: Yury Khrustalev <yury.khrustalev@arm.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/elf/common.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/elf/common.h b/include/elf/common.h index c9920e7..c4eb33b 100644 --- a/include/elf/common.h +++ b/include/elf/common.h @@ -1037,6 +1037,7 @@ #define GNU_PROPERTY_AARCH64_FEATURE_1_BTI (1U << 0) #define GNU_PROPERTY_AARCH64_FEATURE_1_PAC (1U << 1) +#define GNU_PROPERTY_AARCH64_FEATURE_1_GCS (1U << 2) /* Values used in GNU .note.ABI-tag notes (NT_GNU_ABI_TAG). */ #define GNU_ABI_TAG_LINUX 0 |