linux-yocto/Kbuild
Jan Beulich 3234282f33 x86, asm: Fix CFI macro invocations to deal with shortcomings in gas
gas prior to (perhaps) 2.16.90 has problems with passing non-
parenthesized expressions containing spaces to macros. Spaces, however,
get inserted by cpp between any macro expanding to a number and a
subsequent + or -. For the +, current x86 gas then removes the space
again (future gas may not do so), but for the - the space gets retained
and is then considered a separator between macro arguments.

Fix the respective definitions for both the - and + cases, so that they
neither contain spaces nor make cpp insert any (the latter by adding
seemingly redundant parentheses).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <4CBDBEBA020000780001E05A@vpn.id2.novell.com>
Cc: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2010-10-19 14:28:02 -07:00

2.4 KiB

Kbuild for top-level directory of the kernel

This file takes care of the following:

1) Generate bounds.h

2) Generate asm-offsets.h (may need bounds.h)

3) Check for missing system calls

1) Generate bounds.h

bounds-file := include/generated/bounds.h

always := $(bounds-file) targets := $(bounds-file) kernel/bounds.s

quiet_cmd_bounds = GEN $@ define cmd_bounds (set -e;
echo "#ifndef LINUX_BOUNDS_H";
echo "#define LINUX_BOUNDS_H";
echo "/*";
echo " * DO NOT MODIFY.";
echo " *";
echo " * This file was generated by Kbuild";
echo " *";
echo " */";
echo "";
sed -ne $(sed-y) $<;
echo "";
echo "#endif" ) > $@ endef

We use internal kbuild rules to avoid the "is up to date" message from make

kernel/bounds.s: kernel/bounds.c FORCE $(Q)mkdir -p $(dir $@) $(call if_changed_dep,cc_s_c)

$(obj)/$(bounds-file): kernel/bounds.s Kbuild $(Q)mkdir -p $(dir $@) $(call cmd,bounds)

2) Generate asm-offsets.h

offsets-file := include/generated/asm-offsets.h

always += $(offsets-file) targets += $(offsets-file) targets += arch/$(SRCARCH)/kernel/asm-offsets.s

Default sed regexp - multiline due to syntax constraints

define sed-y "/^->/{s:->#.*:/* \1 /:;
s:^->[^ ]* [$$#]
[^ ]* .*:#define \1 (\2) /* \3 */:;
s:->::; p;}" endef

quiet_cmd_offsets = GEN $@ define cmd_offsets (set -e;
echo "#ifndef ASM_OFFSETS_H";
echo "#define ASM_OFFSETS_H";
echo "/*";
echo " * DO NOT MODIFY.";
echo " *";
echo " * This file was generated by Kbuild";
echo " *";
echo " */";
echo "";
sed -ne $(sed-y) $<;
echo "";
echo "#endif" ) > $@ endef

We use internal kbuild rules to avoid the "is up to date" message from make

arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c
$(obj)/$(bounds-file) FORCE $(Q)mkdir -p $(dir $@) $(call if_changed_dep,cc_s_c)

$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s Kbuild $(call cmd,offsets)

3) Check for missing system calls

quiet_cmd_syscalls = CALL $< cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags)

PHONY += missing-syscalls missing-syscalls: scripts/checksyscalls.sh FORCE $(call cmd,syscalls)

Delete all targets during make clean

clean-files := $(addprefix $(objtree)/,$(filter-out $(bounds-file) $(offsets-file),$(targets)))