arch/x86/purgatory/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 OBJECT_FILES_NON_STANDARD := y
   3
   4 purgatory-y := purgatory.o stack.o setup-x86_$(BITS).o sha256.o entry64.o string.o
   5
   6 targets += $(purgatory-y)
   7 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
   8
   9 $(obj)/string.o: $(srctree)/arch/x86/boot/compressed/string.c FORCE
  10         $(call if_changed_rule,cc_o_c)
  11
  12 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
  13         $(call if_changed_rule,cc_o_c)
  14
  15 CFLAGS_sha256.o := -D__DISABLE_EXPORTS
  16
  17 # When profile-guided optimization is enabled, llvm emits two different
  18 # overlapping text sections, which is not supported by kexec. Remove profile
  19 # optimization flags.
  20 KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
  21
  22 LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined -nostdlib -z nodefaultlib
  23 targets += purgatory.ro
  24
  25 # Sanitizer, etc. runtimes are unavailable and cannot be linked here.
  26 GCOV_PROFILE    := n
  27 KASAN_SANITIZE  := n
  28 UBSAN_SANITIZE  := n
  29 KCOV_INSTRUMENT := n
  30
  31 # These are adjustments to the compiler flags used for objects that
  32 # make up the standalone purgatory.ro
  33
  34 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
  35 PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0
  36 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
  37
  38 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
  39 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
  40 # sure how to relocate those.
  41 ifdef CONFIG_FUNCTION_TRACER
  42 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_FTRACE)
  43 endif
  44
  45 ifdef CONFIG_STACKPROTECTOR
  46 PURGATORY_CFLAGS_REMOVE         += -fstack-protector
  47 endif
  48
  49 ifdef CONFIG_STACKPROTECTOR_STRONG
  50 PURGATORY_CFLAGS_REMOVE         += -fstack-protector-strong
  51 endif
  52
  53 ifdef CONFIG_RETPOLINE
  54 PURGATORY_CFLAGS_REMOVE         += $(RETPOLINE_CFLAGS)
  55 endif
  56
  57 CFLAGS_REMOVE_purgatory.o       += $(PURGATORY_CFLAGS_REMOVE)
  58 CFLAGS_purgatory.o              += $(PURGATORY_CFLAGS)
  59
  60 CFLAGS_REMOVE_sha256.o          += $(PURGATORY_CFLAGS_REMOVE)
  61 CFLAGS_sha256.o                 += $(PURGATORY_CFLAGS)
  62
  63 CFLAGS_REMOVE_string.o          += $(PURGATORY_CFLAGS_REMOVE)
  64 CFLAGS_string.o                 += $(PURGATORY_CFLAGS)
  65
  66 AFLAGS_REMOVE_setup-x86_$(BITS).o       += -g -Wa,-gdwarf-2
  67 AFLAGS_REMOVE_entry64.o                 += -g -Wa,-gdwarf-2
  68
  69 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
  70                 $(call if_changed,ld)
  71
  72 targets += kexec-purgatory.c
  73
  74 quiet_cmd_bin2c = BIN2C   $@
  75       cmd_bin2c = $(objtree)/scripts/bin2c kexec_purgatory < $< > $@
  76
  77 $(obj)/kexec-purgatory.c: $(obj)/purgatory.ro FORCE
  78         $(call if_changed,bin2c)
  79
  80 obj-$(CONFIG_KEXEC_FILE)        += kexec-purgatory.o