# See LICENSE file for copyright and license details.

libsyscalls_get_signals.o: generated/linux-signals.h linux/signals.c
libsyscalls_get_signals.lo: generated/linux-signals.h linux/signals.c

generated/linux-signals.tbl: $(LINUX_SOURCE) linux/signals.mk
	mkdir -p -- generated
	set -e; ( \
	get_gcc_or_clang () { \
		( \
			( \
				IFS=:; \
				for dir in $$PATH; do \
					if test ! -d "$$dir"; then continue; fi; \
					for file in "$$dir"/*; do \
						if test ! -x "$$file"; then continue; fi; \
						printf '%s\n' "$$file"; \
					done \
				done \
			) | grep '/\(gcc\|clang\)\(-[0-9.]\+\)\?$$'; \
			printf '%s\n' gcc; \
		) | sed 1q; \
	}; \
	if test -n "$(CC_DEF_EXTRACT)"; then \
		c="$(CC_DEF_EXTRACT)"; \
	else \
		c="$(CC)"; \
	fi; \
	c="$$($$c --version 2>&1 | sed 1q | sed 's/^.*(\(.*\)).*$$/\1/' | tr '[A-Z]' '[a-z]' | cut -d ' ' -f 1)"; \
	if test ! "$$c" = gcc && test ! "$$c" = clang; then \
		c="$$(get_gcc_or_clang)"; \
	fi; \
	extract="$$c -E -dM -D__KERNEL__"; \
	srcdir="linux-src/linux-$(LINUX_VERSION)"; \
	mkdir -p -- "$$srcdir/tools/include/generated/"; \
	touch -- "$$srcdir/tools/include/generated/bounds.h"; \
	touch -- "$$srcdir/tools/include/generated/timeconst.h"; \
	process_arch () \
	{ \
		set -e; \
		signals="$$( \
			$$extract "-I$$srcdir/tools/include" $$fixes "$$2" \
			| sed -n 's/^\s*\x23\s*define\s\+\(SIG[^\s]\+\)\s\+\([0-9]\+\)\s*\(\/.*\)\?$$/'"$$1"' \2 \1/p' \
			| grep -v ' SIG_' \
			| grep -v ' SIGSTKSZ' \
			| sort -k 2 -nu; \
		)"; \
		if test "$$1" = arm; then \
			signals="$$(printf "%s\n" "$$signals" | sed 's/\bSIGSWI\b/SIGRTMIN/')"; \
		fi; \
		printf "%s\n" "$$signals"; \
		sigrtmin="$$(printf "%s\n" "$$signals" | sed -n 's/^.* \([0-9]\+\) SIGRTMIN$$/\1/p')"; \
		maxnamed="$$(printf "%s\n" "$$signals" | sed -n '$$s/^.* \([0-9]\+\) .*$$/\1/p')"; \
		test "$$sigrtmin" = "$$maxnamed"; \
		maxsig=_NSIG; \
		depth=0; \
		while test -n "$$maxsig" && test -n "$$(printf '%s\n' "$$maxsig" | tr -d '[0-9]')" ; do \
			printf '%s: looking for %s\n' "$$1" "$$maxsig" >&2; \
			def="$$maxsig"; \
			maxsig="$$($$extract "-I$$srcdir/tools/include" $$fixes "$$2" \
			           | sed -n 's/^\s*\x23\s*define\s\+'"$$def"'\s\+\([A-Z0-9_]\+\)\s*\(\/.*\)\?$$/\1/p')"; \
			if test -z "$$maxsig"; then \
				maxsig="$$($$extract "-I$$srcdir/tools/include" \
					             "-I$$srcdir/arch/$$1/include" \
					             "-I$$srcdir/include" \
					             "-I$$srcdir" \
				                     $$fixes \
					             "$$(printf '%s\n' "$$2" | sed 's:/uapi/:/:')" \
				           | sed -n 's/^\s*\x23\s*define\s\+'"$$def"'\s\+\([A-Z0-9_]\+\)\s*\(\/.*\)\?$$/\1/p')"; \
			fi; \
			printf '%s: found %s\n' "$$1" "$$maxsig" >&2; \
			: $$(( depth++ )); \
			test $$(( depth )) -lt 1000; \
		done; \
		test -n "$$maxsig"; \
		i=1; \
		while (( sigrtmin + i <= maxsig )); do \
			printf '%s %d SIGRTMIN+%d\n' "$$1" $$(( sigrtmin + i )) $$i; \
			: $$(( i++ )); \
		done; \
	}; \
	getsigs () { \
		process_arch "$$@" | sed 's/\bSIGRTMIN\b/_&/'; \
	}; \
	for arch in $$(printf '%s\n' "$$srcdir/arch"/*/ | sed 's:^.*/\([^/]*\)/$$:\1:'); do \
		if test ! "$$arch" = s390 && test -f "$$srcdir/arch/$$arch/include/uapi/asm/signal.h"; then \
			getsigs "$$arch" "$$srcdir/arch/$$arch/include/uapi/asm/signal.h"; \
		fi; \
	done; \
	getsigs generic "$$srcdir/include/uapi/asm-generic/signal.h"; \
	) > $@
	@printf '\033[1;32m%s\033[m\n' \
		'Compiler warnings above are not of interest, they were generated during' \
		'extraction of the Linux source code and are not part of this library'
	@grep '^generic.*SIGRTMIN+.*' >/dev/null 2>/dev/null < $@
	grep '^generic ' < $@ | cut -d ' ' -f 2 > generated/linux-signals.generic.tbl
	@# For most architectures the signal numbers are the same,
	@# yet they have their own signal.h listing them, so to remove
	@# duplication in the library, we removing duplicates after
	@# validating that they have not diverged
	grep '^arm ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^arm /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^arm64 ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^arm64 /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^hexagon ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^hexagon /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^loongarch ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^loongarch /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^arc ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^arc /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^nios2 ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^nios2 /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^ia64 ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^ia64 /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^m68k ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^m68k /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^powerpc ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^powerpc /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^sh ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^sh /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^x86 ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^x86 /d' < $@ > $@.tmp && mv -- $@.tmp $@
	grep '^xtensa ' < $@ | cut -d ' ' -f 2 | diff -u generated/linux-signals.generic.tbl -
	sed '/^xtensa /d' < $@ > $@.tmp && mv -- $@.tmp $@
	rm -f -- generated/linux-signals.*.tbl

generated/linux-signals.h: generated/linux-signals.tbl linux/signals.mk
	set -e; \
	for arch in $$(cut -d ' ' -f 1 < generated/linux-signals.tbl | uniq); do \
		ARCH="$$(printf '%s\n' "$$arch" | tr '[a-z]' '[A-Z]')"; \
		printf '#define LIST_LINUX_SIGNALS_FOR_%s(X, D)\\\n' "$$ARCH"; \
		sed -n 's/^'"$$arch"' \([0-9]\+\) \(.*\)$$/\tX(\1, "\2") D\\/p' \
		< generated/linux-signals.tbl \
		| sed '$$s/ D\\//'; \
		printf 'static struct libsyscalls_named_number linux_signals_for_%s[] = {\n' "$$arch"; \
		printf '#define X(NR, NAME) {.number.s = NR, .name = NAME}\n'; \
		printf '\tLIST_LINUX_SIGNALS_FOR_%s(X, COMMA)\n' "$$ARCH"; \
		printf '#undef X\n'; \
		printf '};\n'; \
	done > $@