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 #
  29 # Architecture dependencies
  30 #
  31 ifeq ($(CONFIG_ARCH_ACORN),y)
  32 OBJS            += ll_char_wr.o font.o
  33 endif
  34
  35 ifeq ($(CONFIG_ARCH_SA1100),y)
  36 OBJS            += head-sa1100.o
  37 endif
  38
  39 ifeq ($(CONFIG_CPU_XSCALE),y)
  40 OBJS            += head-xscale.o
  41 endif
  42
  43 ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
  44 OBJS            += head-sharpsl.o
  45 endif
  46
  47 ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
  48 ifeq ($(CONFIG_CPU_CP15),y)
  49 OBJS            += big-endian.o
  50 else
  51 # The endian should be set by h/w design.
  52 endif
  53 endif
  54
  55 #
  56 # We now have a PIC decompressor implementation.  Decompressors running
  57 # from RAM should not define ZTEXTADDR.  Decompressors running directly
  58 # from ROM or Flash must define ZTEXTADDR (preferably via the config)
  59 # FIXME: Previous assignment to ztextaddr-y is lost here. See SHARK
  60 ifeq ($(CONFIG_ZBOOT_ROM),y)
  61 ZTEXTADDR       := $(CONFIG_ZBOOT_ROM_TEXT)
  62 ZBSSADDR        := $(CONFIG_ZBOOT_ROM_BSS)
  63 else
  64 ZTEXTADDR       := 0
  65 ZBSSADDR        := ALIGN(8)
  66 endif
  67
  68 CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
  69
  70 compress-$(CONFIG_KERNEL_GZIP) = gzip
  71 compress-$(CONFIG_KERNEL_LZO)  = lzo
  72 compress-$(CONFIG_KERNEL_LZMA) = lzma
  73 compress-$(CONFIG_KERNEL_XZ)   = xzkern
  74 compress-$(CONFIG_KERNEL_LZ4)  = lz4
  75
  76 # Borrowed libfdt files for the ATAG compatibility mode
  77
  78 libfdt          := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c
  79 libfdt_hdrs     := fdt.h libfdt.h libfdt_internal.h
  80
  81 libfdt_objs     := $(addsuffix .o, $(basename $(libfdt)))
  82
  83 $(addprefix $(obj)/,$(libfdt) $(libfdt_hdrs)): $(obj)/%: $(srctree)/scripts/dtc/libfdt/%
  84         $(call cmd,shipped)
  85
  86 $(addprefix $(obj)/,$(libfdt_objs) atags_to_fdt.o): \
  87         $(addprefix $(obj)/,$(libfdt_hdrs))
  88
  89 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
  90 OBJS    += $(libfdt_objs) atags_to_fdt.o
  91 endif
  92
  93 targets       := vmlinux vmlinux.lds piggy_data piggy.o \
  94                  lib1funcs.o ashldi3.o bswapsdi2.o \
  95                  head.o $(OBJS)
  96
  97 clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S \
  98                 $(libfdt) $(libfdt_hdrs) hyp-stub.S
  99
 100 KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 101
 102 ifeq ($(CONFIG_FUNCTION_TRACER),y)
 103 ORIG_CFLAGS := $(KBUILD_CFLAGS)
 104 KBUILD_CFLAGS = $(subst -pg, , $(ORIG_CFLAGS))
 105 endif
 106
 107 # -fstack-protector-strong triggers protection checks in this code,
 108 # but it is being used too early to link to meaningful stack_chk logic.
 109 nossp_flags := $(call cc-option, -fno-stack-protector)
 110 CFLAGS_atags_to_fdt.o := $(nossp_flags)
 111 CFLAGS_fdt.o := $(nossp_flags)
 112 CFLAGS_fdt_ro.o := $(nossp_flags)
 113 CFLAGS_fdt_rw.o := $(nossp_flags)
 114 CFLAGS_fdt_wip.o := $(nossp_flags)
 115
 116 ccflags-y := -fpic -mno-single-pic-base -fno-builtin -I$(obj)
 117 asflags-y := -DZIMAGE
 118
 119 # Supply kernel BSS size to the decompressor via a linker symbol.
 120 KBSS_SZ = $(shell $(CROSS_COMPILE)nm $(obj)/../../../../vmlinux | \
 121                 perl -e 'while (<>) { \
 122                         $$bss_start=hex($$1) if /^([[:xdigit:]]+) B __bss_start$$/; \
 123                         $$bss_end=hex($$1) if /^([[:xdigit:]]+) B __bss_stop$$/; \
 124                 }; printf "%d\n", $$bss_end - $$bss_start;')
 125 LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
 126 # Supply ZRELADDR to the decompressor via a linker symbol.
 127 ifneq ($(CONFIG_AUTO_ZRELADDR),y)
 128 LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
 129 endif
 130 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
 131 LDFLAGS_vmlinux += --be8
 132 endif
 133 # ?
 134 LDFLAGS_vmlinux += -p
 135 # Report unresolved symbol references
 136 LDFLAGS_vmlinux += --no-undefined
 137 # Delete all temporary local symbols
 138 LDFLAGS_vmlinux += -X
 139 # Next argument is a linker script
 140 LDFLAGS_vmlinux += -T
 141
 142 # For __aeabi_uidivmod
 143 lib1funcs = $(obj)/lib1funcs.o
 144
 145 $(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
 146         $(call cmd,shipped)
 147
 148 # For __aeabi_llsl
 149 ashldi3 = $(obj)/ashldi3.o
 150
 151 $(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
 152         $(call cmd,shipped)
 153
 154 # For __bswapsi2, __bswapdi2
 155 bswapsdi2 = $(obj)/bswapsdi2.o
 156
 157 $(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
 158         $(call cmd,shipped)
 159
 160 # We need to prevent any GOTOFF relocs being used with references
 161 # to symbols in the .bss section since we cannot relocate them
 162 # independently from the rest at run time.  This can be achieved by
 163 # ensuring that no private .bss symbols exist, as global symbols
 164 # always have a GOT entry which is what we need.
 165 # The .data section is already discarded by the linker script so no need
 166 # to bother about it here.
 167 check_for_bad_syms = \
 168 bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
 169 [ -z "$$bad_syms" ] || \
 170   ( echo "following symbols must have non local/private scope:" >&2; \
 171     echo "$$bad_syms" >&2; rm -f $@; false )
 172
 173 check_for_multiple_zreladdr = \
 174 if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
 175         echo 'multiple zreladdrs: $(ZRELADDR)'; \
 176         echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
 177         false; \
 178 fi
 179
 180 efi-obj-$(CONFIG_EFI_STUB) := $(objtree)/drivers/firmware/efi/libstub/lib.a
 181
 182 $(obj)/vmlinux: $(obj)/vmlinux.lds $(obj)/$(HEAD) $(obj)/piggy.o \
 183                 $(addprefix $(obj)/, $(OBJS)) $(lib1funcs) $(ashldi3) \
 184                 $(bswapsdi2) $(efi-obj-y) FORCE
 185         @$(check_for_multiple_zreladdr)
 186         $(call if_changed,ld)
 187         @$(check_for_bad_syms)
 188
 189 $(obj)/piggy_data: $(obj)/../Image FORCE
 190         $(call if_changed,$(compress-y))
 191
 192 $(obj)/piggy.o: $(obj)/piggy_data
 193
 194 CFLAGS_font.o := -Dstatic=
 195
 196 $(obj)/font.c: $(FONTC)
 197         $(call cmd,shipped)
 198
 199 AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
 200
 201 $(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
 202         $(call cmd,shipped)