arch/riscv/purgatory/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o
   4 ifeq ($(CONFIG_KASAN_GENERIC)$(CONFIG_KASAN_SW_TAGS),)
   5 purgatory-y += strcmp.o strlen.o strncmp.o
   6 endif
   7
   8 targets += $(purgatory-y)
   9 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
  10
  11 $(obj)/string.o: $(srctree)/lib/string.c FORCE
  12         $(call if_changed_rule,cc_o_c)
  13
  14 $(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE
  15         $(call if_changed_rule,cc_o_c)
  16
  17 $(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE
  18         $(call if_changed_rule,as_o_S)
  19
  20 $(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE
  21         $(call if_changed_rule,as_o_S)
  22
  23 $(obj)/strcmp.o: $(srctree)/arch/riscv/lib/strcmp.S FORCE
  24         $(call if_changed_rule,as_o_S)
  25
  26 $(obj)/strlen.o: $(srctree)/arch/riscv/lib/strlen.S FORCE
  27         $(call if_changed_rule,as_o_S)
  28
  29 $(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE
  30         $(call if_changed_rule,as_o_S)
  31
  32 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
  33         $(call if_changed_rule,cc_o_c)
  34
  35 CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
  36 CFLAGS_string.o := -D__DISABLE_EXPORTS
  37 CFLAGS_ctype.o := -D__DISABLE_EXPORTS
  38
  39 # When profile-guided optimization is enabled, llvm emits two different
  40 # overlapping text sections, which is not supported by kexec. Remove profile
  41 # optimization flags.
  42 KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
  43
  44 # When linking purgatory.ro with -r unresolved symbols are not checked,
  45 # also link a purgatory.chk binary without -r to check for unresolved symbols.
  46 PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
  47 LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
  48 LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
  49 targets += purgatory.ro purgatory.chk
  50
  51 # These are adjustments to the compiler flags used for objects that
  52 # make up the standalone purgatory.ro
  53
  54 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
  55 PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss
  56 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
  57 PURGATORY_CFLAGS += -fno-stack-protector -g0
  58
  59 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
  60 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
  61 # sure how to relocate those.
  62 ifdef CONFIG_FUNCTION_TRACER
  63 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_FTRACE)
  64 endif
  65
  66 ifdef CONFIG_STACKPROTECTOR
  67 PURGATORY_CFLAGS_REMOVE         += -fstack-protector
  68 endif
  69
  70 ifdef CONFIG_STACKPROTECTOR_STRONG
  71 PURGATORY_CFLAGS_REMOVE         += -fstack-protector-strong
  72 endif
  73
  74 ifdef CONFIG_CFI_CLANG
  75 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_CFI)
  76 endif
  77
  78 ifdef CONFIG_RELOCATABLE
  79 PURGATORY_CFLAGS_REMOVE         += -fPIE
  80 endif
  81
  82 ifdef CONFIG_SHADOW_CALL_STACK
  83 PURGATORY_CFLAGS_REMOVE         += $(CC_FLAGS_SCS)
  84 endif
  85
  86 CFLAGS_REMOVE_purgatory.o       += $(PURGATORY_CFLAGS_REMOVE)
  87 CFLAGS_purgatory.o              += $(PURGATORY_CFLAGS)
  88
  89 CFLAGS_REMOVE_sha256.o          += $(PURGATORY_CFLAGS_REMOVE)
  90 CFLAGS_sha256.o                 += $(PURGATORY_CFLAGS)
  91
  92 CFLAGS_REMOVE_string.o          += $(PURGATORY_CFLAGS_REMOVE)
  93 CFLAGS_string.o                 += $(PURGATORY_CFLAGS)
  94
  95 CFLAGS_REMOVE_ctype.o           += $(PURGATORY_CFLAGS_REMOVE)
  96 CFLAGS_ctype.o                  += $(PURGATORY_CFLAGS)
  97
  98 asflags-remove-y                += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
  99
 100 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
 101                 $(call if_changed,ld)
 102
 103 $(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
 104                 $(call if_changed,ld)
 105
 106 $(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk
 107
 108 obj-y += kexec-purgatory.o