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fbac266f09
s390 has instructions to support 128 bit arithmetics, e.g. a 64 bit multiply instruction with a 128 bit result. Also 128 bit integer artithmetics are already used in s390 specific architecture code (see e.g. read_persistent_clock64()). Therefore select ARCH_SUPPORTS_INT128. However limit this to clang for now, since gcc generates inefficient code, which may lead to stack overflows, when compiling lib/crypto/curve25519-hacl64.c which depends on ARCH_SUPPORTS_INT128. The gcc generated functions have 6kb stack frames, compared to only 1kb of the code generated with clang. If the kernel is compiled with -Os library calls for __ashlti3(), __ashrti3(), and __lshrti3() may be generated. Similar to arm64 and riscv provide assembler implementations for these functions. Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
25 lines
831 B
Makefile
25 lines
831 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for s390-specific library files..
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#
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lib-y += delay.o string.o uaccess.o find.o spinlock.o tishift.o
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obj-y += mem.o xor.o
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lib-$(CONFIG_KPROBES) += probes.o
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lib-$(CONFIG_UPROBES) += probes.o
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obj-$(CONFIG_S390_KPROBES_SANITY_TEST) += test_kprobes_s390.o
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test_kprobes_s390-objs += test_kprobes_asm.o test_kprobes.o
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# Instrumenting memory accesses to __user data (in different address space)
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# produce false positives
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KASAN_SANITIZE_uaccess.o := n
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obj-$(CONFIG_S390_UNWIND_SELFTEST) += test_unwind.o
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CFLAGS_test_unwind.o += -fno-optimize-sibling-calls
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obj-$(CONFIG_S390_MODULES_SANITY_TEST) += test_modules.o
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obj-$(CONFIG_S390_MODULES_SANITY_TEST_HELPERS) += test_modules_helpers.o
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lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
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obj-$(CONFIG_EXPOLINE_EXTERN) += expoline/
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