xref: /openbmc/linux/arch/arm/boot/compressed/Makefile (revision 842ed298)
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
8OBJS		=
9
10HEAD	= head.o
11OBJS	+= misc.o decompress.o
12ifeq ($(CONFIG_DEBUG_UNCOMPRESS),y)
13OBJS	+= debug.o
14AFLAGS_head.o += -DDEBUG
15endif
16FONTC	= $(srctree)/lib/fonts/font_acorn_8x8.c
17
18# string library code (-Os is enforced to keep it much smaller)
19OBJS		+= string.o
20CFLAGS_string.o	:= -Os
21
22ifeq ($(CONFIG_ARM_VIRT_EXT),y)
23OBJS		+= hyp-stub.o
24endif
25
26GCOV_PROFILE		:= n
27KASAN_SANITIZE		:= n
28
29# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
30KCOV_INSTRUMENT		:= n
31
32#
33# Architecture dependencies
34#
35ifeq ($(CONFIG_ARCH_ACORN),y)
36OBJS		+= ll_char_wr.o font.o
37endif
38
39ifeq ($(CONFIG_ARCH_SA1100),y)
40OBJS		+= head-sa1100.o
41endif
42
43ifeq ($(CONFIG_CPU_XSCALE),y)
44OBJS		+= head-xscale.o
45endif
46
47ifeq ($(CONFIG_PXA_SHARPSL_DETECT_MACH_ID),y)
48OBJS		+= head-sharpsl.o
49endif
50
51ifeq ($(CONFIG_CPU_ENDIAN_BE32),y)
52ifeq ($(CONFIG_CPU_CP15),y)
53OBJS		+= big-endian.o
54else
55# The endian should be set by h/w design.
56endif
57endif
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
64ifeq ($(CONFIG_ZBOOT_ROM),y)
65ZTEXTADDR	:= $(CONFIG_ZBOOT_ROM_TEXT)
66ZBSSADDR	:= $(CONFIG_ZBOOT_ROM_BSS)
67else
68ZTEXTADDR	:= 0
69ZBSSADDR	:= ALIGN(8)
70endif
71
72MALLOC_SIZE	:= 65536
73
74AFLAGS_head.o += -DTEXT_OFFSET=$(TEXT_OFFSET) -DMALLOC_SIZE=$(MALLOC_SIZE)
75CPPFLAGS_vmlinux.lds := -DTEXT_START="$(ZTEXTADDR)" -DBSS_START="$(ZBSSADDR)"
76CPPFLAGS_vmlinux.lds += -DTEXT_OFFSET="$(TEXT_OFFSET)"
77CPPFLAGS_vmlinux.lds += -DMALLOC_SIZE="$(MALLOC_SIZE)"
78
79compress-$(CONFIG_KERNEL_GZIP) = gzip
80compress-$(CONFIG_KERNEL_LZO)  = lzo
81compress-$(CONFIG_KERNEL_LZMA) = lzma
82compress-$(CONFIG_KERNEL_XZ)   = xzkern
83compress-$(CONFIG_KERNEL_LZ4)  = lz4
84
85libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
86
87ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
88OBJS	+= $(libfdt_objs) atags_to_fdt.o
89endif
90
91# -fstack-protector-strong triggers protection checks in this code,
92# but it is being used too early to link to meaningful stack_chk logic.
93$(foreach o, $(libfdt_objs) atags_to_fdt.o, \
94	$(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector))
95
96# These were previously generated C files. When you are building the kernel
97# with O=, make sure to remove the stale files in the output tree. Otherwise,
98# the build system wrongly compiles the stale ones.
99ifdef building_out_of_srctree
100$(shell rm -f $(addprefix $(obj)/, fdt_rw.c fdt_ro.c fdt_wip.c fdt.c))
101endif
102
103targets       := vmlinux vmlinux.lds piggy_data piggy.o \
104		 lib1funcs.o ashldi3.o bswapsdi2.o \
105		 head.o $(OBJS)
106
107clean-files += piggy_data lib1funcs.S ashldi3.S bswapsdi2.S hyp-stub.S
108
109KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
110
111ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin \
112	     -I$(obj) $(DISABLE_ARM_SSP_PER_TASK_PLUGIN)
113ccflags-remove-$(CONFIG_FUNCTION_TRACER) += -pg
114asflags-y := -DZIMAGE
115
116# Supply kernel BSS size to the decompressor via a linker symbol.
117KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
118		sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \
119		       -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) )
120LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
121# Supply ZRELADDR to the decompressor via a linker symbol.
122ifneq ($(CONFIG_AUTO_ZRELADDR),y)
123LDFLAGS_vmlinux += --defsym zreladdr=$(ZRELADDR)
124endif
125ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
126LDFLAGS_vmlinux += --be8
127endif
128# Report unresolved symbol references
129LDFLAGS_vmlinux += --no-undefined
130# Delete all temporary local symbols
131LDFLAGS_vmlinux += -X
132# Report orphan sections
133ifdef CONFIG_LD_ORPHAN_WARN
134LDFLAGS_vmlinux += --orphan-handling=warn
135endif
136# Next argument is a linker script
137LDFLAGS_vmlinux += -T
138
139# For __aeabi_uidivmod
140lib1funcs = $(obj)/lib1funcs.o
141
142$(obj)/lib1funcs.S: $(srctree)/arch/$(SRCARCH)/lib/lib1funcs.S
143	$(call cmd,shipped)
144
145# For __aeabi_llsl
146ashldi3 = $(obj)/ashldi3.o
147
148$(obj)/ashldi3.S: $(srctree)/arch/$(SRCARCH)/lib/ashldi3.S
149	$(call cmd,shipped)
150
151# For __bswapsi2, __bswapdi2
152bswapsdi2 = $(obj)/bswapsdi2.o
153
154$(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
155	$(call cmd,shipped)
156
157# We need to prevent any GOTOFF relocs being used with references
158# to symbols in the .bss section since we cannot relocate them
159# independently from the rest at run time.  This can be achieved by
160# ensuring that no private .bss symbols exist, as global symbols
161# always have a GOT entry which is what we need.
162# The .data section is already discarded by the linker script so no need
163# to bother about it here.
164check_for_bad_syms = \
165bad_syms=$$($(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
170check_for_multiple_zreladdr = \
171if [ $(words $(ZRELADDR)) -gt 1 -a "$(CONFIG_AUTO_ZRELADDR)" = "" ]; then \
172	echo 'multiple zreladdrs: $(ZRELADDR)'; \
173	echo 'This needs CONFIG_AUTO_ZRELADDR to be set'; \
174	false; \
175fi
176
177efi-obj-$(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: $(obj)/piggy_data
190
191CFLAGS_font.o := -Dstatic=
192
193$(obj)/font.c: $(FONTC)
194	$(call cmd,shipped)
195
196AFLAGS_hyp-stub.o := -Wa,-march=armv7-a
197
198$(obj)/hyp-stub.S: $(srctree)/arch/$(SRCARCH)/kernel/hyp-stub.S
199	$(call cmd,shipped)
200