Makefile 2.3 KB

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  1. # SPDX-License-Identifier: GPL-2.0-only
  2. # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
  3. # the inclusion of generic Makefile.
  4. ARCH_REL_TYPE_ABS := R_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT
  5. include $(srctree)/lib/vdso/Makefile
  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. # Files to link into the compat_vdso
  11. obj-compat_vdso = $(patsubst %, %.o, $(compat_vdso-syms)) note.o
  12. ccflags-y := -fno-stack-protector
  13. # Build rules
  14. targets := $(obj-compat_vdso) compat_vdso.so compat_vdso.so.dbg compat_vdso.lds
  15. obj-compat_vdso := $(addprefix $(obj)/, $(obj-compat_vdso))
  16. obj-y += compat_vdso.o
  17. CPPFLAGS_compat_vdso.lds += -P -C -U$(ARCH)
  18. # Disable profiling and instrumentation for VDSO code
  19. GCOV_PROFILE := n
  20. KCOV_INSTRUMENT := n
  21. # Force dependency
  22. $(obj)/compat_vdso.o: $(obj)/compat_vdso.so
  23. # link rule for the .so file, .lds has to be first
  24. $(obj)/compat_vdso.so.dbg: $(obj)/compat_vdso.lds $(obj-compat_vdso) FORCE
  25. $(call if_changed,compat_vdsold)
  26. LDFLAGS_compat_vdso.so.dbg = -shared -S -soname=linux-compat_vdso.so.1 \
  27. --build-id=sha1 --hash-style=both --eh-frame-hdr
  28. # strip rule for the .so file
  29. $(obj)/%.so: OBJCOPYFLAGS := -S
  30. $(obj)/%.so: $(obj)/%.so.dbg FORCE
  31. $(call if_changed,objcopy)
  32. # Generate VDSO offsets using helper script
  33. gen-compat_vdsosym := $(srctree)/$(src)/gen_compat_vdso_offsets.sh
  34. quiet_cmd_compat_vdsosym = VDSOSYM $@
  35. cmd_compat_vdsosym = $(NM) $< | $(gen-compat_vdsosym) | LC_ALL=C sort > $@
  36. include/generated/compat_vdso-offsets.h: $(obj)/compat_vdso.so.dbg FORCE
  37. $(call if_changed,compat_vdsosym)
  38. # actual build commands
  39. # The DSO images are built using a special linker script
  40. # Make sure only to export the intended __compat_vdso_xxx symbol offsets.
  41. quiet_cmd_compat_vdsold = VDSOLD $@
  42. cmd_compat_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \
  43. $(OBJCOPY) $(patsubst %, -G __compat_vdso_%, $(compat_vdso-syms)) $@.tmp $@ && \
  44. rm $@.tmp
  45. # install commands for the unstripped file
  46. quiet_cmd_compat_vdso_install = INSTALL $@
  47. cmd_compat_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/compat_vdso/$@
  48. compat_vdso.so: $(obj)/compat_vdso.so.dbg
  49. @mkdir -p $(MODLIB)/compat_vdso
  50. $(call cmd,compat_vdso_install)
  51. compat_vdso_install: compat_vdso.so