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glibc/sysdeps/unix/sysv/linux/aarch64/Makefile
Yury Khrustalev bc4bc1650b aarch64: make GCS configure checks aarch64-only 
We only need to enable GCS tests on AArch64 targets, however previously
the configure checks for GCS support in compiler and linker were added
for all targets which was not efficient.

To enable tests for GCS we need 4 things to be true:

 - Compiler supports GCS branch protection.
 - Test compiler supports GCS branch protection.
 - Linker supports GCS marking of binaries.
 - The CRT objects provided by the toolchain have GCS marking.

To check for the latter, we add new macro to aclocal.m4 that allows to
grep output from readelf.

We check all four and then put the result in one make variable to
simplify checks in makefiles.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
2025-11-26 13:50:15 +00:00

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5.3 KiB
Makefile
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ifeq ($(subdir),elf)
tests += \
tst-tlsdesc-pac \
# tests
modules-names += \
tst-tlsdesc-pac-mod \
# modules-names
LDFLAGS-tst-tlsdesc-pac = -rdynamic
$(objpfx)tst-tlsdesc-pac.out: $(objpfx)tst-tlsdesc-pac-mod.so
endif
ifeq ($(subdir),misc)
sysdep_headers += sys/elf.h
tests += \
tst-aarch64-pkey \
# tests
ifeq (yes,$(have-test-gcs))
gcs-tests-dynamic = \
tst-gcs-disabled \
tst-gcs-dlopen-disabled \
tst-gcs-dlopen-enforced \
tst-gcs-dlopen-optional-off \
tst-gcs-dlopen-optional-on \
tst-gcs-dlopen-override \
tst-gcs-enforced \
tst-gcs-enforced-abort \
tst-gcs-noreturn \
tst-gcs-optional-off \
tst-gcs-optional-on \
tst-gcs-override \
tst-gcs-shared-disabled \
tst-gcs-shared-enforced-abort \
tst-gcs-shared-optional \
tst-gcs-shared-override \
# gcs-tests-dynamic
gcs-tests-static = \
tst-gcs-disabled-static \
tst-gcs-enforced-static \
tst-gcs-enforced-static-abort \
tst-gcs-optional-static-off \
tst-gcs-optional-static-on \
tst-gcs-override-static \
# gcs-tests-static
tests += \
$(gcs-tests-dynamic) \
$(gcs-tests-static) \
# tests
tests-static += \
$(gcs-tests-static) \
# tests-static
define run-gcs-abort-test
$(test-wrapper-env) $(run-program-env) \
$(tst-gcs-$*-abort-ENV) $(host-test-program-cmd)
endef
$(objpfx)tst-gcs-%-abort.out: $(..)sysdeps/unix/sysv/linux/aarch64/tst-gcs-abort.sh \
$(objpfx)tst-gcs-%-abort
$(SHELL) $< $(common-objpfx) $(test-name) '$(run-gcs-abort-test)'; \
$(evaluate-test)
LDFLAGS-tst-gcs-disabled += -Wl,-z,gcs=always
LDFLAGS-tst-gcs-enforced += -Wl,-z,gcs=always
LDFLAGS-tst-gcs-enforced-abort += -Wl,-z,gcs=never
LDFLAGS-tst-gcs-optional-on += -Wl,-z,gcs=always
LDFLAGS-tst-gcs-optional-off += -Wl,-z,gcs=never
LDFLAGS-tst-gcs-override += -Wl,-z,gcs=never
LDFLAGS-tst-gcs-disabled-static += -Wl,-z,gcs=always
LDFLAGS-tst-gcs-enforced-static += -Wl,-z,gcs=always
LDFLAGS-tst-gcs-enforced-static-abort += -Wl,-z,gcs=never
LDFLAGS-tst-gcs-optional-static-on += -Wl,-z,gcs=always
LDFLAGS-tst-gcs-optional-static-off += -Wl,-z,gcs=never
LDFLAGS-tst-gcs-override-static += -Wl,-z,gcs=never
tst-gcs-disabled-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=0
tst-gcs-enforced-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1
tst-gcs-enforced-abort-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1
tst-gcs-optional-on-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2
tst-gcs-optional-off-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2
tst-gcs-override-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=3
tst-gcs-disabled-static-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=0
tst-gcs-enforced-static-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1
tst-gcs-enforced-static-abort-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1
tst-gcs-optional-static-on-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2
tst-gcs-optional-static-off-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2
tst-gcs-override-static-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=3
# force one of the dependencies to be unmarked
LDFLAGS-tst-gcs-mod2.so += -Wl,-z,gcs=never
LDFLAGS-tst-gcs-shared-disabled = -Wl,-z,gcs=always
LDFLAGS-tst-gcs-shared-enforced-abort = -Wl,-z,gcs=always
LDFLAGS-tst-gcs-shared-optional = -Wl,-z,gcs=always
LDFLAGS-tst-gcs-shared-override = -Wl,-z,gcs=always
modules-names += \
tst-gcs-mod1 \
tst-gcs-mod2 \
tst-gcs-mod3 \
# modules-names
$(objpfx)tst-gcs-shared-disabled: $(objpfx)tst-gcs-mod1.so $(objpfx)tst-gcs-mod3.so
$(objpfx)tst-gcs-shared-enforced-abort: $(objpfx)tst-gcs-mod1.so $(objpfx)tst-gcs-mod3.so
$(objpfx)tst-gcs-shared-optional: $(objpfx)tst-gcs-mod1.so $(objpfx)tst-gcs-mod3.so
$(objpfx)tst-gcs-shared-override: $(objpfx)tst-gcs-mod1.so $(objpfx)tst-gcs-mod3.so
$(objpfx)tst-gcs-mod1.so: $(objpfx)tst-gcs-mod2.so
tst-gcs-shared-disabled-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=0
tst-gcs-shared-enforced-abort-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1
tst-gcs-shared-optional-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2
tst-gcs-shared-override-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=3
LDFLAGS-tst-gcs-dlopen-disabled = -Wl,-z,gcs=always
LDFLAGS-tst-gcs-dlopen-enforced = -Wl,-z,gcs=always
LDFLAGS-tst-gcs-dlopen-optional-on = -Wl,-z,gcs=always
LDFLAGS-tst-gcs-dlopen-optional-off = -Wl,-z,gcs=never
LDFLAGS-tst-gcs-dlopen-override = -Wl,-z,gcs=always
tst-gcs-dlopen-disabled-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=0
tst-gcs-dlopen-enforced-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1
tst-gcs-dlopen-optional-on-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2
tst-gcs-dlopen-optional-off-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=2
tst-gcs-dlopen-override-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=3
$(objpfx)tst-gcs-dlopen-disabled.out: $(objpfx)tst-gcs-mod2.so
$(objpfx)tst-gcs-dlopen-enforced.out: $(objpfx)tst-gcs-mod2.so
$(objpfx)tst-gcs-dlopen-optional-on.out: $(objpfx)tst-gcs-mod2.so
$(objpfx)tst-gcs-dlopen-optional-off.out: $(objpfx)tst-gcs-mod2.so
$(objpfx)tst-gcs-dlopen-override.out: $(objpfx)tst-gcs-mod2.so
LDFLAGS-tst-gcs-noreturn = -Wl,-z,gcs=always
tst-gcs-noreturn-ENV = GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=0
endif # ifeq ($(have-test-gcs),yes)
endif # ifeq ($(subdir),misc)
ifeq ($(subdir),stdlib)
gen-as-const-headers += ucontext_i.sym
endif
abi-variants := lp64
abi-variants += lp64_be
ifeq (,$(filter $(default-abi),$(abi-variants)))
Unknown ABI, must be one of $(abi-variants)
endif
abi-lp64-condition := !defined __AARCH64EB__
abi-lp64_be-condition := defined __AARCH64EB__
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