arch/riscv/purgatory/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 OBJECT_FILES_NON_STANDARD := y
   3
   4 purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o
   5
   6 targets += $(purgatory-y)
   7 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
   8
   9 $(obj)/string.o: $(srctree)/lib/string.c FORCE
  10         $(call if_changed_rule,cc_o_c)
  11
  12 $(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE
  13         $(call if_changed_rule,cc_o_c)
  14
  15 $(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE
  16         $(call if_changed_rule,as_o_S)
  17
  18 $(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE
  19         $(call if_changed_rule,as_o_S)
  20
  21 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
  22         $(call if_changed_rule,cc_o_c)
  23
  24 CFLAGS_sha256.o := -D__DISABLE_EXPORTS
  25 CFLAGS_string.o := -D__DISABLE_EXPORTS
  26 CFLAGS_ctype.o := -D__DISABLE_EXPORTS
  27
  28 # When profile-guided optimization is enabled, llvm emits two different
  29 # overlapping text sections, which is not supported by kexec. Remove profile
  30 # optimization flags.
  31 KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
  32
  33 # When linking purgatory.ro with -r unresolved symbols are not checked,
  34 # also link a purgatory.chk binary without -r to check for unresolved symbols.
  35 PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
  36 LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
  37 LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
  38 targets += purgatory.ro purgatory.chk
  39
  40 # Sanitizer, etc. runtimes are unavailable and cannot be linked here.
  41 GCOV_PROFILE    := n
  42 KASAN_SANITIZE  := n
  43 UBSAN_SANITIZE  := n
  44 KCSAN_SANITIZE  := n
  45 KCOV_INSTRUMENT := n
  46
  47 # These are adjustments to the compiler flags used for objects that
  48 # make up the standalone purgatory.ro
  49
  50 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
  51 PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss
  52 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
  53 PURGATORY_CFLAGS += -fno-stack-protector -g0
  54
  55 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
  56 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
  57 # sure how to relocate those.
  58 ifdef CONFIG_FUNCTION_TRACER
  59 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_FTRACE)
  60 endif
  61
  62 ifdef CONFIG_STACKPROTECTOR
  63 PURGATORY_CFLAGS_REMOVE         += -fstack-protector
  64 endif
  65
  66 ifdef CONFIG_STACKPROTECTOR_STRONG
  67 PURGATORY_CFLAGS_REMOVE         += -fstack-protector-strong
  68 endif
  69
  70 CFLAGS_REMOVE_purgatory.o       += $(PURGATORY_CFLAGS_REMOVE)
  71 CFLAGS_purgatory.o              += $(PURGATORY_CFLAGS)
  72
  73 CFLAGS_REMOVE_sha256.o          += $(PURGATORY_CFLAGS_REMOVE)
  74 CFLAGS_sha256.o                 += $(PURGATORY_CFLAGS)
  75
  76 CFLAGS_REMOVE_string.o          += $(PURGATORY_CFLAGS_REMOVE)
  77 CFLAGS_string.o                 += $(PURGATORY_CFLAGS)
  78
  79 CFLAGS_REMOVE_ctype.o           += $(PURGATORY_CFLAGS_REMOVE)
  80 CFLAGS_ctype.o                  += $(PURGATORY_CFLAGS)
  81
  82 asflags-remove-y                += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
  83
  84 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
  85                 $(call if_changed,ld)
  86
  87 $(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
  88                 $(call if_changed,ld)
  89
  90 $(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk
  91
  92 obj-y += kexec-purgatory.o