arch/arm/boot/compressed/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # linux/arch/arm/boot/compressed/Makefile
   4 #
   5 # create a compressed vmlinuz image from the original vmlinux
   6 #
   7
   8 OBJS            =
   9
  10 AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET)
  11 HEAD    = head.o
  12 OBJS    += misc.o decompress.o
  13 ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
  14 OBJS    += debug.o
  15 endif
  16 FONTC   = $(srctree)/lib/fonts/font_acorn_8x8.c
  17
  18 # string library code (-Os is enforced to keep it much smaller)
  19 OBJS            += string.o
  20 CFLAGS_string.o := -Os
  21
  22 ifeq ($(CONFIG_ARM_VIRT_EXT),y)
  23 OBJS            += hyp-stub.o
  24 endif
  25
  26 GCOV_PROFILE            := n
  27
  28 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
  29 KCOV_INSTRUMENT         := n
  30
  31 #
  32 # Architecture dependencies
  33 #
  34 ifeq ($(CONFIG_ARCH_ACORN),y)
  35 OBJS            += ll_char_wr.o font.o
  36 endif
  37
  38 ifeq ($(CONFIG_ARCH_SA1100),y)
  39 OBJS            += head-sa1100.o
  40 endif
  41
  42 ifeq ($(CONFIG_CPU_XSCALE),y)
  43 OBJS            += head-xscale.o
  44 endif
  45
  46 ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
  47 OBJS            += head-sharpsl.o
  48 endif
  49
  50 ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
  51 ifeq ($(CONFIG_CPU_CP15),y)
  52 OBJS            += big-endian.o
  53 else
  54 # The endian should be set by h/w design.
  55 endif
  56 endif
  57
  58 #
  59 # We now have a PIC decompressor implementation.  Decompressors running
  60 # from RAM should not define ZTEXTADDR.  Decompressors running directly
  61 # from ROM or Flash must define ZTEXTADDR (preferably via the config)
  62 # FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
  63 ifeq ($(CONFIG_ZBOOT_ROM),y)
  64 ZTEXTADDR       := $(CONFIG_ZBOOT_ROM_TEXT)
  65 ZBSSADDR        := $(CONFIG_ZBOOT_ROM_BSS)
  66 else
  67 ZTEXTADDR       := 0
  68 ZBSSADDR        := ALIGN(8)
  69 endif
  70
  71 CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
  72
  73 compress-$(CONFIG_KERNEL_GZIP) = gzip
  74 compress-$(CONFIG_KERNEL_LZO)  = lzo
  75 compress-$(CONFIG_KERNEL_LZMA) = lzma
  76 compress-$(CONFIG_KERNEL_XZ)   = xzkern
  77 compress-$(CONFIG_KERNEL_LZ4)  = lz4
  78
  79 libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
  80
  81 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
  82 OBJS    += $(libfdt_objs) atags_to_fdt.o
  83 endif
  84
  85 # -fstack-protector-strong triggers protection checks in this code,
  86 # but it is being used too early to link to meaningful stack_chk logic.
  87 nossp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
  88 $(foreach o, $(libfdt_objs) atags_to_fdt.o, \
  89         $(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt $(nossp-flags-y)))
  90
  91 # These were previously generated C files. When you are building the kernel
  92 # with O=, make sure to remove the stale files in the output tree. Otherwise,
  93 # the build system wrongly compiles the stale ones.
  94 ifdef building_out_of_srctree
  95 $(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c))
  96 endif
  97
  98 targets       := vmlinux vmlinux.lds piggy_data piggy.o \
  99                  lib1funcs.o ashldi3.o bswapsdi2.o \
 100                  head.o $(OBJS)
 101
 102 clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S
 103
 104 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 105
 106 ifeq ($(CONFIG_FUNCTION_TRACER),y)
 107 ORIG_CFLAGS := $(KBUILD_CFLAGS)
 108 KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
 109 endif
 110
 111 ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
 112              -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
 113 asflags-y := -DZIMAGE
 114
 115 # Supply kernel BSS size to the decompressor via a linker symbol.
 116 KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
 117                 sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \
 118                        -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) )
 119 LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
 120 # Supply ZRELADDR to the decompressor via a linker symbol.
 121 ifneq ($(CONFIG_AUTO_ZRELADDR),y)
 122 LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
 123 endif
 124 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
 125 LDFLAGS_vmlinux += --be8
 126 endif
 127 # Report unresolved symbol references
 128 LDFLAGS_vmlinux += --no-undefined
 129 # Delete all temporary local symbols
 130 LDFLAGS_vmlinux += -X
 131 # Next argument is a linker script
 132 LDFLAGS_vmlinux += -T
 133
 134 # For __aeabi_uidivmod
 135 lib1funcs = $(obj)/lib1funcs.o
 136
 137 $(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
 138         $(call cmd,shipped)
 139
 140 # For __aeabi_llsl
 141 ashldi3 = $(obj)/ashldi3.o
 142
 143 $(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
 144         $(call cmd,shipped)
 145
 146 # For __bswapsi2, __bswapdi2
 147 bswapsdi2 = $(obj)/bswapsdi2.o
 148
 149 $(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
 150         $(call cmd,shipped)
 151
 152 # We need to prevent any GOTOFF relocs being used with references
 153 # to symbols in the .bss section since we cannot relocate them
 154 # independently from the rest at run time.  This can be achieved by
 155 # ensuring that no private .bss symbols exist, as global symbols
 156 # always have a GOT entry which is what we need.
 157 # The .data section is already discarded by the linker script so no need
 158 # to bother about it here.
 159 check_for_bad_syms = \
 160 bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
 161 [ -z "$$bad_syms" ] || \
 162   ( echo "following symbols must have non local/private scope:" >&2; \
 163     echo "$$bad_syms" >&2; false )
 164
 165 check_for_multiple_zreladdr = \
 166 if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
 167         echo 'multiple zreladdrs: $(ZRELADDR)'; \
 168         echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
 169         false; \
 170 fi
 171
 172 efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
 173
 174 $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
 175                 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
 176                 $(bswapsdi2) $(efi-obj-y) FORCE
 177         @$(check_for_multiple_zreladdr)
 178         $(call if_changed,ld)
 179         @$(check_for_bad_syms)
 180
 181 $(obj)/piggy_data: $(obj)/../Image FORCE
 182         $(call if_changed,$(compress-y))
 183
 184 $(obj)/piggy.o: $(obj)/piggy_data
 185
 186 CFLAGS_font.o := -Dstatic=
 187
 188 $(obj)/font.c: $(FONTC)
 189         $(call cmd,shipped)
 190
 191 AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
 192
 193 $(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
 194         $(call cmd,shipped)