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linux-yocto/arch/riscv/kernel/compat_vdso/Makefile
Masahiro Yamada 7f7f6f7ad6 Makefile: remove redundant tool coverage variables 
Now Kbuild provides reasonable defaults for objtool, sanitizers, and
profilers.

Remove redundant variables.

Note:

This commit changes the coverage for some objects:

  - include arch/mips/vdso/vdso-image.o into UBSAN, GCOV, KCOV
  - include arch/sparc/vdso/vdso-image-*.o into UBSAN
  - include arch/sparc/vdso/vma.o into UBSAN
  - include arch/x86/entry/vdso/extable.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso-image-*.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso32-setup.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vma.o into GCOV, KCOV
  - include arch/x86/um/vdso/vma.o into KASAN, GCOV, KCOV

I believe these are positive effects because all of them are kernel
space objects.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Roberto Sassu <roberto.sassu@huawei.com>
2024-05-14 23:35:48 +09:00

2.5 KiB
Raw Blame History

SPDX-License-Identifier: GPL-2.0-only

Makefile for compat_vdso

Symbols present in the compat_vdso

compat_vdso-syms = rt_sigreturn compat_vdso-syms += getcpu compat_vdso-syms += flush_icache

COMPAT_CC := $(CC) COMPAT_LD := $(LD)

binutils 2.35 does not support the zifencei extension, but in the ISA

spec 20191213, G stands for IMAFD_ZICSR_ZIFENCEI.

ifdef CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32 else COMPAT_CC_FLAGS := -march=rv32imafd -mabi=ilp32 endif COMPAT_LD_FLAGS := -melf32lriscv

Disable attributes, as they're useless and break the build.

COMPAT_CC_FLAGS += $(call cc-option,-mno-riscv-attribute) COMPAT_CC_FLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr)

Files to link into the compat_vdso

obj-compat_vdso = $(patsubst %, %.o, $(compat_vdso-syms)) note.o

Build rules

targets := $(obj-compat_vdso) compat_vdso.so compat_vdso.so.dbg compat_vdso.lds obj-compat_vdso := $(addprefix $(obj)/, $(obj-compat_vdso))

obj-y += compat_vdso.o CPPFLAGS_compat_vdso.lds += -P -C -DCOMPAT_VDSO -U$(ARCH)

Force dependency

$(obj)/compat_vdso.o: $(obj)/compat_vdso.so

link rule for the .so file, .lds has to be first

$(obj)/compat_vdso.so.dbg: $(obj)/compat_vdso.lds $(obj-compat_vdso) FORCE $(call if_changed,compat_vdsold) LDFLAGS_compat_vdso.so.dbg = -shared -S -soname=linux-compat_vdso.so.1
--build-id=sha1 --hash-style=both --eh-frame-hdr

$(obj-compat_vdso): %.o: %.S FORCE $(call if_changed_dep,compat_vdsoas)

strip rule for the .so file

$(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy)

Generate VDSO offsets using helper script

gen-compat_vdsosym := $(src)/gen_compat_vdso_offsets.sh quiet_cmd_compat_vdsosym = VDSOSYM $@ cmd_compat_vdsosym = $(NM) $< | $(gen-compat_vdsosym) | LC_ALL=C sort > $@

include/generated/compat_vdso-offsets.h: $(obj)/compat_vdso.so.dbg FORCE $(call if_changed,compat_vdsosym)

actual build commands

The DSO images are built using a special linker script

Make sure only to export the intended __compat_vdso_xxx symbol offsets.

quiet_cmd_compat_vdsold = VDSOLD $@ cmd_compat_vdsold = $(COMPAT_LD) $(ld_flags) $(COMPAT_LD_FLAGS) -T $(filter-out FORCE,$^) -o $@.tmp &&
$(OBJCOPY) $(patsubst %, -G _compat_vdso%, $(compat_vdso-syms)) $@.tmp $@ &&
rm $@.tmp

actual build commands

quiet_cmd_compat_vdsoas = VDSOAS $@ cmd_compat_vdsoas = $(COMPAT_CC) $(a_flags) $(COMPAT_CC_FLAGS) -c -o $@ $<