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 purgatory-y += strcmp.o strlen.o strncmp.o
   6
   7 targets += $(purgatory-y)
   8 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
   9
  10 $(obj)/string.o: $(srctree)/lib/string.c FORCE
  11         $(call if_changed_rule,cc_o_c)
  12
  13 $(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE
  14         $(call if_changed_rule,cc_o_c)
  15
  16 $(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE
  17         $(call if_changed_rule,as_o_S)
  18
  19 $(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE
  20         $(call if_changed_rule,as_o_S)
  21
  22 $(obj)/strcmp.o: $(srctree)/arch/riscv/lib/strcmp.S FORCE
  23         $(call if_changed_rule,as_o_S)
  24
  25 $(obj)/strlen.o: $(srctree)/arch/riscv/lib/strlen.S FORCE
  26         $(call if_changed_rule,as_o_S)
  27
  28 $(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE
  29         $(call if_changed_rule,as_o_S)
  30
  31 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
  32         $(call if_changed_rule,cc_o_c)
  33
  34 CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
  35 CFLAGS_string.o := -D__DISABLE_EXPORTS
  36 CFLAGS_ctype.o := -D__DISABLE_EXPORTS
  37
  38 # When profile-guided optimization is enabled, llvm emits two different
  39 # overlapping text sections, which is not supported by kexec. Remove profile
  40 # optimization flags.
  41 KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
  42
  43 # When linking purgatory.ro with -r unresolved symbols are not checked,
  44 # also link a purgatory.chk binary without -r to check for unresolved symbols.
  45 PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
  46 LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
  47 LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
  48 targets += purgatory.ro purgatory.chk
  49
  50 # Sanitizer, etc. runtimes are unavailable and cannot be linked here.
  51 GCOV_PROFILE    := n
  52 KASAN_SANITIZE  := n
  53 UBSAN_SANITIZE  := n
  54 KCSAN_SANITIZE  := n
  55 KCOV_INSTRUMENT := n
  56
  57 # These are adjustments to the compiler flags used for objects that
  58 # make up the standalone purgatory.ro
  59
  60 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
  61 PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss
  62 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
  63 PURGATORY_CFLAGS += -fno-stack-protector -g0
  64
  65 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
  66 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
  67 # sure how to relocate those.
  68 ifdef CONFIG_FUNCTION_TRACER
  69 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_FTRACE)
  70 endif
  71
  72 ifdef CONFIG_STACKPROTECTOR
  73 PURGATORY_CFLAGS_REMOVE         += -fstack-protector
  74 endif
  75
  76 ifdef CONFIG_STACKPROTECTOR_STRONG
  77 PURGATORY_CFLAGS_REMOVE         += -fstack-protector-strong
  78 endif
  79
  80 ifdef CONFIG_CFI_CLANG
  81 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_CFI)
  82 endif
  83
  84 CFLAGS_REMOVE_purgatory.o       += $(PURGATORY_CFLAGS_REMOVE)
  85 CFLAGS_purgatory.o              += $(PURGATORY_CFLAGS)
  86
  87 CFLAGS_REMOVE_sha256.o          += $(PURGATORY_CFLAGS_REMOVE)
  88 CFLAGS_sha256.o                 += $(PURGATORY_CFLAGS)
  89
  90 CFLAGS_REMOVE_string.o          += $(PURGATORY_CFLAGS_REMOVE)
  91 CFLAGS_string.o                 += $(PURGATORY_CFLAGS)
  92
  93 CFLAGS_REMOVE_ctype.o           += $(PURGATORY_CFLAGS_REMOVE)
  94 CFLAGS_ctype.o                  += $(PURGATORY_CFLAGS)
  95
  96 asflags-remove-y                += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
  97
  98 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
  99                 $(call if_changed,ld)
 100
 101 $(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
 102                 $(call if_changed,ld)
 103
 104 $(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk
 105
 106 obj-y += kexec-purgatory.o