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 linking purgatory.ro with -r unresolved symbols are not checked,
  18 # also link a purgatory.chk binary without -r to check for unresolved symbols.
  19 PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
  20 LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
  21 LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
  22 targets += purgatory.ro purgatory.chk
  23
  24 # Sanitizer, etc. runtimes are unavailable and cannot be linked here.
  25 GCOV_PROFILE    := n
  26 KASAN_SANITIZE  := n
  27 UBSAN_SANITIZE  := n
  28 KCSAN_SANITIZE  := n
  29 KMSAN_SANITIZE  := n
  30 KCOV_INSTRUMENT := n
  31
  32 # These are adjustments to the compiler flags used for objects that
  33 # make up the standalone purgatory.ro
  34
  35 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
  36 PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0
  37 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
  38 PURGATORY_CFLAGS += -fno-stack-protector
  39
  40 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
  41 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
  42 # sure how to relocate those.
  43 ifdef CONFIG_FUNCTION_TRACER
  44 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_FTRACE)
  45 endif
  46
  47 ifdef CONFIG_STACKPROTECTOR
  48 PURGATORY_CFLAGS_REMOVE         += -fstack-protector
  49 endif
  50
  51 ifdef CONFIG_STACKPROTECTOR_STRONG
  52 PURGATORY_CFLAGS_REMOVE         += -fstack-protector-strong
  53 endif
  54
  55 ifdef CONFIG_RETPOLINE
  56 PURGATORY_CFLAGS_REMOVE         += $(RETPOLINE_CFLAGS)
  57 endif
  58
  59 ifdef CONFIG_CFI_CLANG
  60 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_CFI)
  61 endif
  62
  63 CFLAGS_REMOVE_purgatory.o       += $(PURGATORY_CFLAGS_REMOVE)
  64 CFLAGS_purgatory.o              += $(PURGATORY_CFLAGS)
  65
  66 CFLAGS_REMOVE_sha256.o          += $(PURGATORY_CFLAGS_REMOVE)
  67 CFLAGS_sha256.o                 += $(PURGATORY_CFLAGS)
  68
  69 CFLAGS_REMOVE_string.o          += $(PURGATORY_CFLAGS_REMOVE)
  70 CFLAGS_string.o                 += $(PURGATORY_CFLAGS)
  71
  72 asflags-remove-y                += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
  73
  74 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
  75                 $(call if_changed,ld)
  76
  77 $(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
  78                 $(call if_changed,ld)
  79
  80 $(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk
  81
  82 obj-y += kexec-purgatory.o