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 HEAD    = head.o
  11 OBJS    += misc.o decompress.o
  12 ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
  13 OBJS    += debug.o
  14 AFLAGS_head.o += -DDEBUG
  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 KASAN_SANITIZE          := n
  28
  29 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
  30 KCOV_INSTRUMENT         := n
  31
  32 #
  33 # Architecture dependencies
  34 #
  35 ifeq ($(CONFIG_ARCH_ACORN),y)
  36 OBJS            += ll_char_wr.o font.o
  37 endif
  38
  39 ifeq ($(CONFIG_ARCH_SA1100),y)
  40 OBJS            += head-sa1100.o
  41 endif
  42
  43 ifeq ($(CONFIG_CPU_XSCALE),y)
  44 OBJS            += head-xscale.o
  45 endif
  46
  47 ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
  48 OBJS            += head-sharpsl.o
  49 endif
  50
  51 ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
  52 ifeq ($(CONFIG_CPU_CP15),y)
  53 OBJS            += big-endian.o
  54 else
  55 # The endian should be set by h/w design.
  56 endif
  57 endif
  58
  59 #
  60 # We now have a PIC decompressor implementation.  Decompressors running
  61 # from RAM should not define ZTEXTADDR.  Decompressors running directly
  62 # from ROM or Flash must define ZTEXTADDR (preferably via the config)
  63 # FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
  64 ifeq ($(CONFIG_ZBOOT_ROM),y)
  65 ZTEXTADDR       := $(CONFIG_ZBOOT_ROM_TEXT)
  66 ZBSSADDR        := $(CONFIG_ZBOOT_ROM_BSS)
  67 else
  68 ZTEXTADDR       := 0
  69 ZBSSADDR        := ALIGN(8)
  70 endif
  71
  72 MALLOC_SIZE     := 65536
  73
  74 AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
  75 CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
  76 CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
  77 CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
  78
  79 compress-$(CONFIG_KERNEL_GZIP) = gzip
  80 compress-$(CONFIG_KERNEL_LZO)  = lzo
  81 compress-$(CONFIG_KERNEL_LZMA) = lzma
  82 compress-$(CONFIG_KERNEL_XZ)   = xzkern
  83 compress-$(CONFIG_KERNEL_LZ4)  = lz4
  84
  85 libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
  86
  87 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
  88 OBJS    += $(libfdt_objs) atags_to_fdt.o
  89 endif
  90
  91 # -fstack-protector-strong triggers protection checks in this code,
  92 # but it is being used too early to link to meaningful stack_chk logic.
  93 $(foreach o, $(libfdt_objs) atags_to_fdt.o, \
  94         $(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector))
  95
  96 # These were previously generated C files. When you are building the kernel
  97 # with O=, make sure to remove the stale files in the output tree. Otherwise,
  98 # the build system wrongly compiles the stale ones.
  99 ifdef building_out_of_srctree
 100 $(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c))
 101 endif
 102
 103 targets       := vmlinux vmlinux.lds piggy_data piggy.o \
 104                  lib1funcs.o ashldi3.o bswapsdi2.o \
 105                  head.o $(OBJS)
 106
 107 clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S
 108
 109 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 110
 111 ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
 112              -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
 113 ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
 114 asflags-y := -DZIMAGE
 115
 116 # Supply kernel BSS size to the decompressor via a linker symbol.
 117 KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
 118                 sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \
 119                        -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) )
 120 LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
 121 # Supply ZRELADDR to the decompressor via a linker symbol.
 122 ifneq ($(CONFIG_AUTO_ZRELADDR),y)
 123 LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
 124 endif
 125 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
 126 LDFLAGS_vmlinux += --be8
 127 endif
 128 # Report unresolved symbol references
 129 LDFLAGS_vmlinux += --no-undefined
 130 # Delete all temporary local symbols
 131 LDFLAGS_vmlinux += -X
 132 # Report orphan sections
 133 ifdef CONFIG_LD_ORPHAN_WARN
 134 LDFLAGS_vmlinux += --orphan-handling=warn
 135 endif
 136 # Next argument is a linker script
 137 LDFLAGS_vmlinux += -T
 138
 139 # For __aeabi_uidivmod
 140 lib1funcs = $(obj)/lib1funcs.o
 141
 142 $(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
 143         $(call cmd,shipped)
 144
 145 # For __aeabi_llsl
 146 ashldi3 = $(obj)/ashldi3.o
 147
 148 $(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
 149         $(call cmd,shipped)
 150
 151 # For __bswapsi2, __bswapdi2
 152 bswapsdi2 = $(obj)/bswapsdi2.o
 153
 154 $(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
 155         $(call cmd,shipped)
 156
 157 # We need to prevent any GOTOFF relocs being used with references
 158 # to symbols in the .bss section since we cannot relocate them
 159 # independently from the rest at run time.  This can be achieved by
 160 # ensuring that no private .bss symbols exist, as global symbols
 161 # always have a GOT entry which is what we need.
 162 # The .data section is already discarded by the linker script so no need
 163 # to bother about it here.
 164 check_for_bad_syms = \
 165 bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
 166 [ -z "$$bad_syms" ] || \
 167   ( echo "following symbols must have non local/private scope:" >&2; \
 168     echo "$$bad_syms" >&2; false )
 169
 170 check_for_multiple_zreladdr = \
 171 if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
 172         echo 'multiple zreladdrs: $(ZRELADDR)'; \
 173         echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
 174         false; \
 175 fi
 176
 177 efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
 178
 179 $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
 180                 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
 181                 $(bswapsdi2) $(efi-obj-y) FORCE
 182         @$(check_for_multiple_zreladdr)
 183         $(call if_changed,ld)
 184         @$(check_for_bad_syms)
 185
 186 $(obj)/piggy_data: $(obj)/../Image FORCE
 187         $(call if_changed,$(compress-y))
 188
 189 $(obj)/piggy.o: $(obj)/piggy_data
 190
 191 CFLAGS_font.o := -Dstatic=
 192
 193 $(obj)/font.c: $(FONTC)
 194         $(call cmd,shipped)
 195
 196 AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
 197
 198 $(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
 199         $(call cmd,shipped)