[XEN,v4,03/32] tools/fuzz/x86_instruction_emulator: rework makefile

Commit Message

Anthony PERARD Aug. 11, 2022, 4:48 p.m. UTC

Rework dependencies of all objects. We don't need to add dependencies
for headers that $(CC) is capable of generating, we only need to
include $(DEPS_INCLUDE). Some dependencies are still needed so make
knows to generate symlinks for them.

We remove the use of "vpath" for cpuid.c. While it works fine for now,
when we will convert this makefile to subdirmk, vpath will not be
usable. Also, "-iquote" is now needed to build "cpuid.o".

Replace "-I." by "-iquote .", so it applies to double-quote includes
only.

Rather than checking if a symlink exist, always regenerate the
symlink. So if the source tree changed location, the symlink is
updated.

Since we are creating a new .gitignore for the symlink, also move the
entry to it.

Signed-off-by: Anthony PERARD <[e-mail]>
Reviewed-by: Luca Fancellu <[e-mail]>
---

Notes:
    v4:
    - Use pattern rules to link sources from libx86 and from x86 emulator
      tests
    - fix rm of .*.d2 dependency files
    
    v2:
    - create a new per-directory .gitignore to add the new entry and existing ones

 tools/fuzz/x86_instruction_emulator/Makefile  | 35 +++++++++----------
 .gitignore                                    |  6 ----
 .../fuzz/x86_instruction_emulator/.gitignore  |  7 ++++
 3 files changed, 24 insertions(+), 24 deletions(-)
 create mode 100644 tools/fuzz/x86_instruction_emulator/.gitignore

Comments

Jan Beulich Aug. 12, 2022, 1:41 p.m. UTC | #1

On 11.08.2022 18:48, Anthony PERARD wrote:
> Rework dependencies of all objects. We don't need to add dependencies
> for headers that $(CC) is capable of generating, we only need to
> include $(DEPS_INCLUDE). Some dependencies are still needed so make
> knows to generate symlinks for them.
> 
> We remove the use of "vpath" for cpuid.c. While it works fine for now,
> when we will convert this makefile to subdirmk, vpath will not be
> usable. Also, "-iquote" is now needed to build "cpuid.o".
> 
> Replace "-I." by "-iquote .", so it applies to double-quote includes
> only.
> 
> Rather than checking if a symlink exist, always regenerate the
> symlink. So if the source tree changed location, the symlink is
> updated.
> 
> Since we are creating a new .gitignore for the symlink, also move the
> entry to it.
> 
> Signed-off-by: Anthony PERARD <[e-mail]>
> Reviewed-by: Luca Fancellu <[e-mail]>

Acked-by: Jan Beulich <[e-mail]>

Patch

diff --git a/tools/fuzz/x86_instruction_emulator/Makefile b/tools/fuzz/x86_instruction_emulator/Makefile
index 1a6dbf94e1..13aa238503 100644
--- a/tools/fuzz/x86_instruction_emulator/Makefile
+++ b/tools/fuzz/x86_instruction_emulator/Makefile
@@ -9,32 +9,29 @@  x86-insn-fuzz-all:
 endif
 
 # Add libx86 to the build
-vpath %.c $(XEN_ROOT)/xen/lib/x86
+%.c: $(XEN_ROOT)/xen/lib/x86/%.c FORCE
+	ln -nsf $< $@
 
-x86_emulate:
-	[ -L $@ ] || ln -sf $(XEN_ROOT)/xen/arch/x86/$@
+x86_emulate: FORCE
+	ln -nsf $(XEN_ROOT)/xen/arch/x86/$@
 
 x86_emulate/%: x86_emulate ;
 
-x86-emulate.c x86-emulate.h wrappers.c: %:
-	[ -L $* ] || ln -sf $(XEN_ROOT)/tools/tests/x86_emulator/$*
+%.c: $(XEN_ROOT)/tools/tests/x86_emulator/%.c FORCE
+	ln -nsf $< $@
+%.h: $(XEN_ROOT)/tools/tests/x86_emulator/%.h FORCE
+	ln -nsf $< $@
 
-CFLAGS += $(CFLAGS_xeninclude) -D__XEN_TOOLS__ -I.
+CFLAGS += $(CFLAGS_xeninclude) -D__XEN_TOOLS__ -iquote .
+cpuid.o: CFLAGS += -iquote $(XEN_ROOT)/xen/lib/x86
 
 GCOV_FLAGS := --coverage
 %-cov.o: %.c
 	$(CC) -c $(CFLAGS) $(GCOV_FLAGS) $< -o $@
 
-x86.h := $(addprefix $(XEN_ROOT)/tools/include/xen/asm/,\
-                     x86-vendors.h x86-defns.h msr-index.h) \
-         $(addprefix $(XEN_ROOT)/tools/include/xen/lib/x86/, \
-                     cpuid.h cpuid-autogen.h)
-x86_emulate.h := x86-emulate.h x86_emulate/x86_emulate.h $(x86.h)
-
-# x86-emulate.c will be implicit for both
-x86-emulate.o x86-emulate-cov.o: x86_emulate/x86_emulate.c $(x86_emulate.h)
-
-fuzz-emul.o fuzz-emulate-cov.o cpuid.o wrappers.o: $(x86_emulate.h)
+x86-emulate.h: x86_emulate/x86_emulate.h
+x86-emulate.o x86-emulate-cov.o: x86-emulate.h x86_emulate/x86_emulate.c
+fuzz-emul.o fuzz-emul-cov.o wrappers.o: x86-emulate.h
 
 x86-insn-fuzzer.a: fuzz-emul.o x86-emulate.o cpuid.o
 	$(AR) rc $@ $^
@@ -51,11 +48,11 @@  all: x86-insn-fuzz-all
 
 .PHONY: distclean
 distclean: clean
-	rm -f x86_emulate x86-emulate.c x86-emulate.h
+	rm -f x86_emulate x86-emulate.c x86-emulate.h wrappers.c cpuid.c
 
 .PHONY: clean
 clean:
-	rm -f *.a *.o .*.d afl-harness afl-harness-cov *.gcda *.gcno *.gcov
+	rm -f *.a *.o $(DEPS_RM) afl-harness afl-harness-cov *.gcda *.gcno *.gcov
 
 .PHONY: install
 install: all
@@ -67,3 +64,5 @@  afl: afl-harness
 
 .PHONY: afl-cov
 afl-cov: afl-harness-cov
+
+-include $(DEPS_INCLUDE)
diff --git a/.gitignore b/.gitignore
index ed7bd8bdc7..ff1d668489 100644
--- a/.gitignore
+++ b/.gitignore
@@ -195,12 +195,6 @@  tools/flask/utils/flask-loadpolicy
 tools/flask/utils/flask-setenforce
 tools/flask/utils/flask-set-bool
 tools/flask/utils/flask-label-pci
-tools/fuzz/x86_instruction_emulator/asm
-tools/fuzz/x86_instruction_emulator/afl-harness
-tools/fuzz/x86_instruction_emulator/afl-harness-cov
-tools/fuzz/x86_instruction_emulator/wrappers.c
-tools/fuzz/x86_instruction_emulator/x86_emulate
-tools/fuzz/x86_instruction_emulator/x86-emulate.[ch]
 tools/helpers/init-xenstore-domain
 tools/helpers/xen-init-dom0
 tools/hotplug/common/hotplugpath.sh
diff --git a/tools/fuzz/x86_instruction_emulator/.gitignore b/tools/fuzz/x86_instruction_emulator/.gitignore
new file mode 100644
index 0000000000..65c3cf9702
--- /dev/null
+++ b/tools/fuzz/x86_instruction_emulator/.gitignore
@@ -0,0 +1,7 @@ 
+/asm
+/afl-harness
+/afl-harness-cov
+/cpuid.c
+/wrappers.c
+/x86_emulate
+/x86-emulate.[ch]