On 24/06/2021 14.01, Janosch Frank wrote:
From: Steffen Eiden <seiden@xxxxxxxxxxxxx>
This patch provides the necessary make targets to properly compile
snippets and link them into their associated host.
To define the guest-host definition, we use the make-feature
`SECONDEXPANSION` in combination with `Target specific Variable
Values`. The variable `snippets` has different values depending on the
current target. This enables us to define which snippets (=guests)
belong to which hosts. Furthermore, using the second-expansion, we can
use `snippets` in the perquisites of the host's `%.elf` rule, which
otherwise would be not set.
Signed-off-by: Steffen Eiden <seiden@xxxxxxxxxxxxx>
---
s390x/Makefile | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/s390x/Makefile b/s390x/Makefile
index 8820e99..ba32f4c 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -76,11 +76,26 @@ OBJDIRS += lib/s390x
asmlib = $(TEST_DIR)/cstart64.o $(TEST_DIR)/cpu.o
FLATLIBS = $(libcflat)
-%.elf: %.o $(FLATLIBS) $(SRCDIR)/s390x/flat.lds $(asmlib)
- $(CC) $(CFLAGS) -c -o $(@:.elf=.aux.o) \
- $(SRCDIR)/lib/auxinfo.c -DPROGNAME=\"$@\"
- $(CC) $(LDFLAGS) -o $@ -T $(SRCDIR)/s390x/flat.lds \
- $(filter %.o, $^) $(FLATLIBS) $(@:.elf=.aux.o)
+
+SNIPPET_DIR = $(TEST_DIR)/snippets
+snippet_asmlib = $(SNIPPET_DIR)/c/cstart.o
+
+# perquisites (=guests) for the snippet hosts.
+# $(TEST_DIR)/<snippet-host>.elf: snippets = $(SNIPPET_DIR)/<c/asm>/<snippet>.gbin
+
+$(SNIPPET_DIR)/asm/%.gbin: $(SNIPPET_DIR)/asm/%.o $(FLATLIBS)
+ $(OBJCOPY) -O binary $(patsubst %.gbin,%.o,$@) $@
+ $(OBJCOPY) -I binary -O elf64-s390 -B "s390:64-bit" $@ $@
+
+$(SNIPPET_DIR)/c/%.gbin: $(SNIPPET_DIR)/c/%.o $(snippet_asmlib) $(FLATLIBS)
+ $(CC) $(LDFLAGS) -o $@ -T $(SNIPPET_DIR)/c/flat.lds $(patsubst %.gbin,%.o,$@) $(snippet_asmlib) $(FLATLIBS)
+ $(OBJCOPY) -O binary $@ $@
+ $(OBJCOPY) -I binary -O elf64-s390 -B "s390:64-bit" $@ $@
+
+.SECONDEXPANSION:
+%.elf: $$(snippets) %.o $(FLATLIBS) $(SRCDIR)/s390x/flat.lds $(asmlib)
+ $(CC) $(CFLAGS) -c -o $(@:.elf=.aux.o) $(SRCDIR)/lib/auxinfo.c -DPROGNAME=\"$@\"
+ $(CC) $(LDFLAGS) -o $@ -T $(SRCDIR)/s390x/flat.lds $(filter %.o, $^) $(FLATLIBS) $(snippets) $(@:.elf=.aux.o)
Wow, weird Makefile magic, never seend that before ... but it sounds
reasonable, so:
Acked-by: Thomas Huth <thuth@xxxxxxxxxx>
