1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
VERSION = 0.1.0-alpha
CC = clang
LD = ld.lld
NM = llvm-nm
OBJCOPY = llvm-objcopy
COMPILER = $(shell $(CC) --version | head -n 1)
LINKER = $(shell $(LD) --version | head -n 1)
ARCH_FLAG = \
--target=riscv32-unknown-elf \
-march=rv32g \
-mabi=ilp32 \
-D__SYS_LITTLE_ENDIAN__
COMMON_FLAGS = \
-ffreestanding \
-fno-builtin \
-fno-stack-protector \
-fno-exceptions \
-fno-rtti \
-fno-unwind-tables \
-fno-asynchronous-unwind-tables \
-nostdlib \
-nostdinc \
-nodefaultlibs \
-DVERSION='"$(VERSION)"' \
-DCOMPILER_NAME='"$(COMPILER)"' \
-DLINKER_NAME='"$(LINKER)"' \
KERNEL_FLAG = $(COMMON_FLAGS) -static
MODULE_FLAG = $(COMMON_FLAGS) -fPIC -fpie
SECTION_FLAG = \
-ffunction-sections \
-fdata-sections \
-fno-common
INCLUDE_FLAG = -Iinclude -Ikernel
OPT_FLAG = -O2 -g3
WARN_FLAG = -Wall -Wextra -Werror -Wundef
KERNEL_LD_FLAG = -T $(KERNEL_LD) -nostdlib -m elf32lriscv --gc-sections
MODULE_LD_FLAG = -nostdlib -shared -m elf32lriscv --gc-sections
KERNEL_OBJCOPY_FLAG = -O binary \
--strip-all \
--remove-section=.comment \
--remove-section=.debug* \
--remove-section=.note* \
--remove-section=.eh_frame \
--remove-section=.eh_frame_ptr \
--remove-section=.eh_frame_hdr
MODULE_OBJCOPY_FLAG = \
--strip-debug \
--remove-section=.comment \
--remove-section=.note*
KERNEL_CFLAGS = $(ARCH_FLAG) $(KERNEL_FLAG) $(SECTION_FLAG) $(INCLUDE_FLAG) $(OPT_FLAG) $(WARN_FLAG)
MODULE_CFLAGS = $(ARCH_FLAG) $(MODULE_FLAG) $(SECTION_FLAG) $(INCLUDE_FLAG) $(OPT_FLAG) $(WARN_FLAG) -D__KERNEL_MODULE__
MODULES = $(wildcard $(shell grep '^modules:' BuildConfig | sed 's/^modules://' | awk '{$$1=$$1; print}'))
MODULE_OBJECTS = $(foreach m,$(MODULES),$m/$m.ko)
define module_template
$(1)_SRCS = $$(wildcard $$(shell grep '^$(1):' BuildConfig | sed 's/^$(1)://' | awk '{$$$$1=$$$$1; print}'))
$(1)_ELF = $(1)/$(1).elf
$(1)_BIN = $(1)/$(1).ko
$(1)_C_SRCS = $$(filter %.c,$$($(1)_SRCS))
$(1)_S_SRCS = $$(filter %.S,$$($(1)_SRCS))
$(1)_C_OBJS = $$($(1)_C_SRCS:.c=.o)
$(1)_S_OBJS = $$($(1)_S_SRCS:.S=.o)
$(1)_OBJS = $$($(1)_C_OBJS) $$($(1)_S_OBJS)
$$($(1)_C_OBJS): %.o: %.c
@echo " CC [MOD] $$<"
$$(CC) $$(MODULE_CFLAGS) -c $$< -o $$@
$$($(1)_S_OBJS): %.o: %.S
@echo " AS [MOD] $$<"
$$(CC) $$(MODULE_CFLAGS) -c $$< -o $$@
$$($(1)_ELF): $$($(1)_OBJS)
@echo " LD [MOD] $$@"
$$(LD) $$(MODULE_LD_FLAG) $$^ -o $$@
$$($(1)_BIN): $$($(1)_ELF)
@echo " OBJCOPY [MOD] $$@"
$$(OBJCOPY) $$(MODULE_OBJCOPY_FLAG) $$^ $$@
endef
$(foreach module,$(MODULES),$(eval $(call module_template,$(module))))
KERNEL_SRCS = $(wildcard $(shell grep '^kernel:' BuildConfig | sed 's/^kernel://' | awk '{$$1=$$1; print}'))
KERNEL_LD := $(shell grep '^linker_script:' BuildConfig | sed 's/^linker_script://' | awk '{$$1=$$1; print}')
KERNEL_TARGET := $(shell grep '^kernel_target:' BuildConfig | sed 's/^kernel_target://' | awk '{$$1=$$1; print}')
KERNEL_OBJS = $(KERNEL_SRCS:.c=.o)
KERNEL_OBJS := $(KERNEL_OBJS:.S=.o)
KERNEL_BIN := $(KERNEL_TARGET)/kernel.bin
KERNEL_ELF := $(KERNEL_TARGET)/kernel.elf
KERNEL_IMAGE := $(KERNEL_TARGET)/Image
KASSEMBLE_BIN := misc/kassemble
KASSEMBLE_SRC := misc/kassemble.c
GENERATED = \
$(KERNEL_OBJS) \
$(KERNEL_ELF) \
$(KERNEL_BIN) \
$(KERNEL_IMAGE) \
$(foreach m,$(MODULES),$(m)/$(m).elf) \
$(foreach m,$(MODULES),$(m)/$(m).ko) \
$(foreach m,$(MODULES),$($(m)_OBJS)) \
$(KASSEMBLE_BIN)
.PHONY: all kernel kassemble clean modules $(MODULES)
$(V).SILENT:
all: kassemble kernel modules
kernel: $(KERNEL_IMAGE)
modules: $(MODULES)
kassemble: $(KASSEMBLE_BIN)
$(MODULES): $(MODULE_OBJECTS)
%.o: %.c
@echo " CC $<"
$(CC) $(KERNEL_CFLAGS) -c $< -o $@
%.o: %.S
@echo " AS $<"
$(CC) $(KERNEL_CFLAGS) -c $< -o $@
$(KASSEMBLE_BIN): $(KASSEMBLE_SRC)
@echo " HOSTCC $<"
$(CC) -O2 $< -o $@
$(KERNEL_ELF): $(KERNEL_OBJS) $(KERNEL_LD) | $(KERNEL_OUTDIR)/
@echo " LD $@"
$(LD) $(KERNEL_LD_FLAG) $(KERNEL_OBJS) -o $@
$(KERNEL_BIN): $(KERNEL_ELF) | $(KERNEL_OUTDIR)/
@echo " OBJCOPY $@"
$(OBJCOPY) $(KERNEL_OBJCOPY_FLAG) $(KERNEL_ELF) $(KERNEL_BIN)
$(KERNEL_IMAGE): $(KERNEL_BIN) | $(KERNEL_OUTDIR)/
@echo " KASSEMBLE $@"
$(KASSEMBLE_BIN) $< $@ $$($(NM) $(KERNEL_ELF) | awk '/__image_size/{print $$1}')
clean:
@echo " CLEAN $(GENERATED)"
$(RM) $(GENERATED)
|
