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100 lines
2.6 KiB
100 lines
2.6 KiB
# |
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# Kbuild for top-level directory of the kernel |
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# This file takes care of the following: |
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# 1) Generate bounds.h |
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# 2) Generate timeconst.h |
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# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h) |
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# 4) Check for missing system calls |
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# Default sed regexp - multiline due to syntax constraints |
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define sed-y |
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"/^->/{s:->#\(.*\):/* \1 */:; \ |
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s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \ |
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s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ |
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s:->::; p;}" |
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endef |
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# Use filechk to avoid rebuilds when a header changes, but the resulting file |
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# does not |
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define filechk_offsets |
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(set -e; \ |
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echo "#ifndef $2"; \ |
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echo "#define $2"; \ |
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echo "/*"; \ |
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echo " * DO NOT MODIFY."; \ |
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echo " *"; \ |
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echo " * This file was generated by Kbuild"; \ |
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echo " */"; \ |
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echo ""; \ |
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sed -ne $(sed-y); \ |
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echo ""; \ |
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echo "#endif" ) |
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endef |
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##### |
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# 1) Generate bounds.h |
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bounds-file := include/generated/bounds.h |
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always := $(bounds-file) |
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targets := kernel/bounds.s |
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# We use internal kbuild rules to avoid the "is up to date" message from make |
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kernel/bounds.s: kernel/bounds.c FORCE |
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$(Q)mkdir -p $(dir $@) |
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$(call if_changed_dep,cc_s_c) |
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$(obj)/$(bounds-file): kernel/bounds.s FORCE |
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$(call filechk,offsets,__LINUX_BOUNDS_H__) |
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##### |
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# 2) Generate timeconst.h |
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timeconst-file := include/generated/timeconst.h |
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targets += $(timeconst-file) |
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quiet_cmd_gentimeconst = GEN $@ |
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define cmd_gentimeconst |
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(echo $(CONFIG_HZ) | bc -q $< ) > $@ |
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endef |
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define filechk_gentimeconst |
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(echo $(CONFIG_HZ) | bc -q $< ) |
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endef |
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$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE |
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$(call filechk,gentimeconst) |
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##### |
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# 3) Generate asm-offsets.h |
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# |
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offsets-file := include/generated/asm-offsets.h |
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always += $(offsets-file) |
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targets += arch/$(SRCARCH)/kernel/asm-offsets.s |
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# We use internal kbuild rules to avoid the "is up to date" message from make |
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arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \ |
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$(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE |
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$(Q)mkdir -p $(dir $@) |
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$(call if_changed_dep,cc_s_c) |
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$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE |
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$(call filechk,offsets,__ASM_OFFSETS_H__) |
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##### |
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# 4) Check for missing system calls |
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# |
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always += missing-syscalls |
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targets += missing-syscalls |
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quiet_cmd_syscalls = CALL $< |
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cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags) |
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missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE |
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$(call cmd,syscalls) |
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# Keep these three files during make clean |
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no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)
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