projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0715372a GR |
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 | ||
| ca09f772 MX |
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 | |
| 0715372a GR |
21 | COMPAT_LD_FLAGS := -melf32lriscv |
| 22 | ||
| e18048da PD |
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 | ||
| 0715372a GR |
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)/, $(obj-compat_vdso)) | |
| 33 | ||
| 34 | obj-y += compat_vdso.o | |
| aa5af0aa | 35 | CPPFLAGS_compat_vdso.lds += -P -C -DCOMPAT_VDSO -U$(ARCH) |
| 0715372a | 36 | |
| 0715372a GR |
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 | |
| b1992c37 | 55 | gen-compat_vdsosym := $(src)/gen_compat_vdso_offsets.sh |
| 0715372a GR |
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 | |
| 7115ff4a | 71 | quiet_cmd_compat_vdsoas = VDSOAS $@ |
| 0715372a | 72 | cmd_compat_vdsoas = $(COMPAT_CC) $(a_flags) $(COMPAT_CC_FLAGS) -c -o $@ $< |