1 # SPDX-License-Identifier: GPL-2.0-only 2 # 3 # Makefile for compat_vdso 4 # 5 6 # Symbols present in the compat_vdso 7 compat_vdso-syms = rt_sigreturn 8 compat_vdso-syms += getcpu 9 compat_vdso-syms += flush_icache 10 11 COMPAT_CC := $(CC) 12 COMPAT_LD := $(LD) 13 14 # binutils 2.35 does not support the zifencei extension, but in the ISA 15 # spec 20191213, G stands for IMAFD_ZICSR_ZIFENCEI. 16 ifdef CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI 17 COMPAT_CC_FLAGS := -march=rv32g -mabi=ilp32 18 else 19 COMPAT_CC_FLAGS := -march=rv32imafd -mabi=ilp32 20 endif 21 COMPAT_LD_FLAGS := -melf32lriscv 22 23 # Disable attributes, as they're useless and break the build. 24 COMPAT_CC_FLAGS += $(call cc-option,-mno-riscv-attribute) 25 COMPAT_CC_FLAGS += $(call as-option,-Wa$(comma)-mno-arch-attr) 26 27 # Files to link into the compat_vdso 28 obj-compat_vdso = $(patsubst %, %.o, $(compat_vdso-syms)) note.o 29 30 # Build rules 31 targets := $(obj-compat_vdso) compat_vdso.so compat_vdso.so.dbg compat_vdso.lds 32 obj-compat_vdso := $(addprefix $(obj)/, $(obj-compat_vdso)) 33 34 obj-y += compat_vdso.o 35 CPPFLAGS_compat_vdso.lds += -P -C -DCOMPAT_VDSO -U$(ARCH) 36 37 # Force dependency 38 $(obj)/compat_vdso.o: $(obj)/compat_vdso.so 39 40 # link rule for the .so file, .lds has to be first 41 $(obj)/compat_vdso.so.dbg: $(obj)/compat_vdso.lds $(obj-compat_vdso) FORCE 42 $(call if_changed,compat_vdsold) 43 LDFLAGS_compat_vdso.so.dbg = -shared -S -soname=linux-compat_vdso.so.1 \ 44 --build-id=sha1 --hash-style=both --eh-frame-hdr 45 46 $(obj-compat_vdso): %.o: %.S FORCE 47 $(call if_changed_dep,compat_vdsoas) 48 49 # strip rule for the .so file 50 $(obj)/%.so: OBJCOPYFLAGS := -S 51 $(obj)/%.so: $(obj)/%.so.dbg FORCE 52 $(call if_changed,objcopy) 53 54 # Generate VDSO offsets using helper script 55 gen-compat_vdsosym := $(src)/gen_compat_vdso_offsets.sh 56 quiet_cmd_compat_vdsosym = VDSOSYM $@ 57 cmd_compat_vdsosym = $(NM) $< | $(gen-compat_vdsosym) | LC_ALL=C sort > $@ 58 59 include/generated/compat_vdso-offsets.h: $(obj)/compat_vdso.so.dbg FORCE 60 $(call if_changed,compat_vdsosym) 61 62 # actual build commands 63 # The DSO images are built using a special linker script 64 # Make sure only to export the intended __compat_vdso_xxx symbol offsets. 65 quiet_cmd_compat_vdsold = VDSOLD $@ 66 cmd_compat_vdsold = $(COMPAT_LD) $(ld_flags) $(COMPAT_LD_FLAGS) -T $(filter-out FORCE,$^) -o $@.tmp && \ 67 $(OBJCOPY) $(patsubst %, -G __compat_vdso_%, $(compat_vdso-syms)) $@.tmp $@ && \ 68 rm $@.tmp 69 70 # actual build commands 71 quiet_cmd_compat_vdsoas = VDSOAS $@ 72 cmd_compat_vdsoas = $(COMPAT_CC) $(a_flags) $(COMPAT_CC_FLAGS) -c -o $@ $<
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