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glibc/sysdeps/aarch64/Makefile

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AArch64 Port
2012-11-09 17:53:51 +00:00
long-double-fcts = yes
aarch64: ensure objects are BTI compatible When glibc is built with branch protection (i.e. with a gcc configured with --enable-standard-branch-protection), all glibc binaries should be BTI compatible and marked as such. It is easy to link BTI incompatible objects by accident and this is silent currently which is usually not the expectation, so this is changed into a link error. (There is no linker flag for failing on BTI incompatible inputs so all warnings are turned into fatal errors outside the test system when building glibc with branch protection.) Unfortunately, outlined atomic functions are not BTI compatible in libgcc (PR libgcc/96001), so to build glibc with current gcc use 'CC=gcc -mno-outline-atomics', this should be fixed in libgcc soon and then glibc can be built and tested without such workarounds. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2020-06-30 10:12:40 +00:00
ifeq (yes,$(aarch64-bti))
# Mark linker output BTI compatible, it warns on non-BTI inputs.
sysdep-LDFLAGS += -Wl,-z,force-bti
# Make warnings fatal outside the test system.
LDFLAGS-lib.so += -Wl,--fatal-warnings
LDFLAGS-rtld += -Wl,-z,force-bti,--fatal-warnings
endif
aarch64: enable BTI at runtime Binaries can opt-in to using BTI via an ELF object file marking. The dynamic linker has to then mprotect the executable segments with PROT_BTI. In case of static linked executables or in case of the dynamic linker itself, PROT_BTI protection is done by the operating system. On AArch64 glibc uses PT_GNU_PROPERTY instead of PT_NOTE to check the properties of a binary because PT_NOTE can be unreliable with old linkers (old linkers just append the notes of input objects together and add them to the output without checking them for consistency which means multiple incompatible GNU property notes can be present in PT_NOTE). BTI property is handled in the loader even if glibc is not built with BTI support, so in theory user code can be BTI protected independently of glibc. In practice though user binaries are not marked with the BTI property if glibc has no support because the static linked libc objects (crt files, libc_nonshared.a) are unmarked. This patch relies on Linux userspace API that is not yet in a linux release but in v5.8-rc1 so scheduled to be in Linux 5.8. Co-authored-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2020-06-22 09:57:20 +00:00
ifeq ($(subdir),elf)
sysdep-dl-routines += dl-bti
elf: Fix runtime linker auditing on aarch64 (BZ #26643) The rtld audit support show two problems on aarch64: 1. _dl_runtime_resolve does not preserve x8, the indirect result location register, which might generate wrong result calls depending of the function signature. 2. The NEON Q registers pushed onto the stack by _dl_runtime_resolve were twice the size of D registers extracted from the stack frame by _dl_runtime_profile. While 2. might result in wrong information passed on the PLT tracing, 1. generates wrong runtime behaviour. The aarch64 rtld audit support is changed to: * Both La_aarch64_regs and La_aarch64_retval are expanded to include both x8 and the full sized NEON V registers, as defined by the ABI. * dl_runtime_profile needed to extract registers saved by _dl_runtime_resolve and put them into the new correctly sized La_aarch64_regs structure. * The LAV_CURRENT check is change to only accept new audit modules to avoid the undefined behavior of not save/restore x8. * Different than other architectures, audit modules older than LAV_CURRENT are rejected (both La_aarch64_regs and La_aarch64_retval changed their layout and there are no requirements to support multiple audit interface with the inherent aarch64 issues). * A new field is also reserved on both La_aarch64_regs and La_aarch64_retval to support variant pcs symbols. Similar to x86, a new La_aarch64_vector type to represent the NEON register is added on the La_aarch64_regs (so each type can be accessed directly). Since LAV_CURRENT was already bumped to support bind-now, there is no need to increase it again. Checked on aarch64-linux-gnu. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2022-01-24 13:46:18 +00:00
tests += tst-audit26 \
tst-audit27
modules-names += \
tst-audit26mod \
tst-auditmod26 \
tst-audit27mod \
tst-auditmod27
$(objpfx)tst-audit26: $(objpfx)tst-audit26mod.so \
$(objpfx)tst-auditmod26.so
LDFLAGS-tst-audit26 += -Wl,-z,lazy
tst-audit26-ENV = LD_AUDIT=$(objpfx)tst-auditmod26.so
$(objpfx)tst-audit27: $(objpfx)tst-audit27mod.so \
$(objpfx)tst-auditmod27.so
$(objpfx)tst-audit27mod.so: $(libsupport)
LDFLAGS-tst-audit27 += -Wl,-z,lazy
tst-audit27-ENV = LD_AUDIT=$(objpfx)tst-auditmod27.so
aarch64: enable BTI at runtime Binaries can opt-in to using BTI via an ELF object file marking. The dynamic linker has to then mprotect the executable segments with PROT_BTI. In case of static linked executables or in case of the dynamic linker itself, PROT_BTI protection is done by the operating system. On AArch64 glibc uses PT_GNU_PROPERTY instead of PT_NOTE to check the properties of a binary because PT_NOTE can be unreliable with old linkers (old linkers just append the notes of input objects together and add them to the output without checking them for consistency which means multiple incompatible GNU property notes can be present in PT_NOTE). BTI property is handled in the loader even if glibc is not built with BTI support, so in theory user code can be BTI protected independently of glibc. In practice though user binaries are not marked with the BTI property if glibc has no support because the static linked libc objects (crt files, libc_nonshared.a) are unmarked. This patch relies on Linux userspace API that is not yet in a linux release but in v5.8-rc1 so scheduled to be in Linux 5.8. Co-authored-by: Szabolcs Nagy <szabolcs.nagy@arm.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2020-06-22 09:57:20 +00:00
endif
AArch64 Port
2012-11-09 17:53:51 +00:00
ifeq ($(subdir),elf)
aarch64: Move ld.so _start to separate file and drop _dl_skip_args A separate asm file is easier to maintain than a macro that expands to inline asm. The RTLD_START macro is only needed now because _dl_start is local in rtld.c, but _start has to call it, if _dl_start was made hidden then it could be empty. _dl_skip_args is no longer needed. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-12-30 17:08:36 +00:00
sysdep-rtld-routines += dl-start
AArch64 Port
2012-11-09 17:53:51 +00:00
sysdep-dl-routines += tlsdesc dl-tlsdesc
gen-as-const-headers += dl-link.sym
aarch64: new ifunc resolver ABI Passing a second argument to the ifunc resolver allows accessing AT_HWCAP2 values from the resolver. AArch64 will start using AT_HWCAP2 on linux because for ilp32 to remain compatible with lp64 ABI no more than 32bit hwcap flags can be in AT_HWCAP which is already used up. Currently the relocation ordering logic does not guarantee that ifunc resolvers can call libc apis or access libc objects, so only the resolver arguments and runtime environment dependent instructions can be used to do the dispatch (this affects ifunc resolvers outside of the libc). Since ifunc resolver is target specific and only supposed to be called by the dynamic linker, the call ABI can be changed in a backward compatible way: Old call ABI passed hwcap as uint64_t, new abi sets the _IFUNC_ARG_HWCAP flag in the hwcap and passes a second argument that's a pointer to an extendible struct. A resolver has to check the _IFUNC_ARG_HWCAP flag before accessing the second argument. The new sys/ifunc.h installed header has the definitions for the new ABI, everything is in the implementation reserved namespace. An alternative approach is to try to support extern calls from ifunc resolvers such as getauxval, but that seems non-trivial https://sourceware.org/ml/libc-alpha/2017-01/msg00468.html * sysdeps/aarch64/Makefile: Install sys/ifunc.h and add tests. * sysdeps/aarch64/dl-irel.h (elf_ifunc_invoke): Update to new ABI. * sysdeps/aarch64/sys/ifunc.h: New file. * sysdeps/aarch64/tst-ifunc-arg-1.c: New file. * sysdeps/aarch64/tst-ifunc-arg-2.c: New file.
2019-04-23 14:59:34 +00:00
tests-internal += tst-ifunc-arg-1 tst-ifunc-arg-2
aarch64: Add variant PCS lazy binding test [BZ #26798] This test fails without bug 26798 fixed because some integer registers likely get clobbered by lazy binding and variant PCS only allows x16 and x17 to be clobbered at call time. The test requires binutils 2.32.1 or newer for handling variant PCS symbols. SVE registers are not covered by this test, to avoid the complexity of handling multiple compile- and runtime feature support cases.
2020-10-26 15:48:01 +00:00
ifeq (yes,$(aarch64-variant-pcs))
tests += tst-vpcs
modules-names += tst-vpcs-mod
LDFLAGS-tst-vpcs-mod.so = -Wl,-z,lazy
$(objpfx)tst-vpcs: $(objpfx)tst-vpcs-mod.so
endif
AArch64 Port
2012-11-09 17:53:51 +00:00
endif
ifeq ($(subdir),csu)
gen-as-const-headers += tlsdesc.sym
endif
[AArch64] Fix libc internal asm profiling code When glibc is built with --enable-profile, the ENTRY of asm functions includes CALL_MCOUNT for profiling. (matters for binaries static linked against libc_p.a.) CALL_MCOUNT did not save/restore argument registers around the _mcount call so it clobbered them. (it is enough to only save/restore the arguments passed to a given asm function, but that would be too many asm changes so it is simpler to always save all argument registers in this macro.) float args are not saved: mcount does not clobber the float regs and currently no asm function takes float arguments anyway. [BZ #18707] * sysdeps/aarch64/Makefile (CFLAGS-mcount.c): Add -mgeneral-regs-only. * sysdeps/aarch64/sysdep.h (CALL_MCOUNT): Save argument registers.
2016-07-11 08:46:08 +00:00
ifeq ($(subdir),gmon)
CFLAGS-mcount.c += -mgeneral-regs-only
endif
Remove sysdeps/aarch64/soft-fp directory. As per <https://sourceware.org/ml/libc-alpha/2014-10/msg00369.html>, there should not be separate sysdeps/<arch>/soft-fp directories when those are used by all configurations that use sysdeps/<arch>, and, more generally, should not be sysdeps/foo/Implies files pointing to a subdirectory foo/bar. This patch eliminates the sysdeps/aarch64/soft-fp directory accordingly, merging its contents into sysdeps/aarch64. Tested with build-many-glibcs.py that installed stripped shared libraries for aarch64 configurations are unchanged by this patch. * sysdeps/aarch64/Implies: Remove aarch64/soft-fp. * sysdeps/aarch64/Makefile [$(subdir) = math] (CPPFLAGS): Add -I../soft-fp. Moved from .... * sysdeps/aarch64/soft-fp/Makefile: ... here. Remove file. * sysdeps/aarch64/soft-fp/e_sqrtl.c: Move to .... * sysdeps/aarch64/e_sqrtl.c: ... here. * sysdeps/aarch64/soft-fp/sfp-machine.h: Move to .... * sysdeps/aarch64/sfp-machine.h: ... here.
2018-05-22 17:23:34 +00:00
ifeq ($(subdir),math)
CPPFLAGS += -I../soft-fp
configure: Use -Wno-ignored-attributes if compiler warns about multiple aliases clang emits an warning when a double alias redirection is used, to warn the the original symbol will be used even when weak definition is overridden. However, this is a common pattern for weak_alias, where multiple alias are set to same symbol. Reviewed-by: Fangrui Song <maskray@google.com>
2022-03-11 13:40:44 +00:00
CFLAGS-feupdateenv.c += $(config-cflags-wno-ignored-attributes)
Remove sysdeps/aarch64/soft-fp directory. As per <https://sourceware.org/ml/libc-alpha/2014-10/msg00369.html>, there should not be separate sysdeps/<arch>/soft-fp directories when those are used by all configurations that use sysdeps/<arch>, and, more generally, should not be sysdeps/foo/Implies files pointing to a subdirectory foo/bar. This patch eliminates the sysdeps/aarch64/soft-fp directory accordingly, merging its contents into sysdeps/aarch64. Tested with build-many-glibcs.py that installed stripped shared libraries for aarch64 configurations are unchanged by this patch. * sysdeps/aarch64/Implies: Remove aarch64/soft-fp. * sysdeps/aarch64/Makefile [$(subdir) = math] (CPPFLAGS): Add -I../soft-fp. Moved from .... * sysdeps/aarch64/soft-fp/Makefile: ... here. Remove file. * sysdeps/aarch64/soft-fp/e_sqrtl.c: Move to .... * sysdeps/aarch64/e_sqrtl.c: ... here. * sysdeps/aarch64/soft-fp/sfp-machine.h: Move to .... * sysdeps/aarch64/sfp-machine.h: ... here.
2018-05-22 17:23:34 +00:00
endif
aarch64: new ifunc resolver ABI Passing a second argument to the ifunc resolver allows accessing AT_HWCAP2 values from the resolver. AArch64 will start using AT_HWCAP2 on linux because for ilp32 to remain compatible with lp64 ABI no more than 32bit hwcap flags can be in AT_HWCAP which is already used up. Currently the relocation ordering logic does not guarantee that ifunc resolvers can call libc apis or access libc objects, so only the resolver arguments and runtime environment dependent instructions can be used to do the dispatch (this affects ifunc resolvers outside of the libc). Since ifunc resolver is target specific and only supposed to be called by the dynamic linker, the call ABI can be changed in a backward compatible way: Old call ABI passed hwcap as uint64_t, new abi sets the _IFUNC_ARG_HWCAP flag in the hwcap and passes a second argument that's a pointer to an extendible struct. A resolver has to check the _IFUNC_ARG_HWCAP flag before accessing the second argument. The new sys/ifunc.h installed header has the definitions for the new ABI, everything is in the implementation reserved namespace. An alternative approach is to try to support extern calls from ifunc resolvers such as getauxval, but that seems non-trivial https://sourceware.org/ml/libc-alpha/2017-01/msg00468.html * sysdeps/aarch64/Makefile: Install sys/ifunc.h and add tests. * sysdeps/aarch64/dl-irel.h (elf_ifunc_invoke): Update to new ABI. * sysdeps/aarch64/sys/ifunc.h: New file. * sysdeps/aarch64/tst-ifunc-arg-1.c: New file. * sysdeps/aarch64/tst-ifunc-arg-2.c: New file.
2019-04-23 14:59:34 +00:00
ifeq ($(subdir),misc)
sysdep_headers += sys/ifunc.h
aarch64: inline __libc_mtag_address_get_tag This is a common operation when heap tagging is enabled, so inline the instruction instead of using an extern call. The .inst directive is used instead of the name of the instruction (or acle intrinsics) because malloc.c is not compiled for armv8.5-a+memtag architecture, runtime cpu support detection is used. Prototypes are removed from the comments as they were not always correct.
2021-02-04 10:04:07 +00:00
sysdep_routines += __mtag_tag_zero_region \
aarch64: Add aarch64-specific files for memory tagging support This final patch provides the architecture-specific implementation of the memory-tagging support hooks for aarch64.
2020-12-21 15:03:03 +00:00
__mtag_tag_region
glibc.malloc.check: Wean away from malloc hooks The malloc-check debugging feature is tightly integrated into glibc malloc, so thanks to an idea from Florian Weimer, much of the malloc implementation has been moved into libc_malloc_debug.so to support malloc-check. Due to this, glibc malloc and malloc-check can no longer work together; they use altogether different (but identical) structures for heap management. This should not make a difference though since the malloc check hook is not disabled anywhere. malloc_set_state does, but it does so early enough that it shouldn't cause any problems. The malloc check tunable is now in the debug DSO and has no effect when the DSO is not preloaded. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2021-07-22 13:08:08 +00:00
endif
aarch64: Add aarch64-specific files for memory tagging support This final patch provides the architecture-specific implementation of the memory-tagging support hooks for aarch64.
2020-12-21 15:03:03 +00:00
glibc.malloc.check: Wean away from malloc hooks The malloc-check debugging feature is tightly integrated into glibc malloc, so thanks to an idea from Florian Weimer, much of the malloc implementation has been moved into libc_malloc_debug.so to support malloc-check. Due to this, glibc malloc and malloc-check can no longer work together; they use altogether different (but identical) structures for heap management. This should not make a difference though since the malloc check hook is not disabled anywhere. malloc_set_state does, but it does so early enough that it shouldn't cause any problems. The malloc check tunable is now in the debug DSO and has no effect when the DSO is not preloaded. Reviewed-by: Carlos O'Donell <carlos@redhat.com> Tested-by: Carlos O'Donell <carlos@redhat.com>
2021-07-22 13:08:08 +00:00
ifeq ($(subdir),malloc)
sysdep_malloc_debug_routines = __mtag_tag_zero_region __mtag_tag_region
aarch64: new ifunc resolver ABI Passing a second argument to the ifunc resolver allows accessing AT_HWCAP2 values from the resolver. AArch64 will start using AT_HWCAP2 on linux because for ilp32 to remain compatible with lp64 ABI no more than 32bit hwcap flags can be in AT_HWCAP which is already used up. Currently the relocation ordering logic does not guarantee that ifunc resolvers can call libc apis or access libc objects, so only the resolver arguments and runtime environment dependent instructions can be used to do the dispatch (this affects ifunc resolvers outside of the libc). Since ifunc resolver is target specific and only supposed to be called by the dynamic linker, the call ABI can be changed in a backward compatible way: Old call ABI passed hwcap as uint64_t, new abi sets the _IFUNC_ARG_HWCAP flag in the hwcap and passes a second argument that's a pointer to an extendible struct. A resolver has to check the _IFUNC_ARG_HWCAP flag before accessing the second argument. The new sys/ifunc.h installed header has the definitions for the new ABI, everything is in the implementation reserved namespace. An alternative approach is to try to support extern calls from ifunc resolvers such as getauxval, but that seems non-trivial https://sourceware.org/ml/libc-alpha/2017-01/msg00468.html * sysdeps/aarch64/Makefile: Install sys/ifunc.h and add tests. * sysdeps/aarch64/dl-irel.h (elf_ifunc_invoke): Update to new ABI. * sysdeps/aarch64/sys/ifunc.h: New file. * sysdeps/aarch64/tst-ifunc-arg-1.c: New file. * sysdeps/aarch64/tst-ifunc-arg-2.c: New file.
2019-04-23 14:59:34 +00:00
endif
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