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authorAlexander Graf <agraf@suse.de>2011-09-30 17:40:36 (GMT)
committerYury Usishchev <y.usishchev@samsung.com>2014-12-10 10:47:57 (GMT)
commit055d4830aa573fe144829ac73b9c956be9b5feb7 (patch)
treed8270397c3405d095ce5b9abd7b4768e91e03f27
parente42dffc94cb2b1d9d53753f45e12bea1d191ed97 (diff)
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linux-user: add binfmt wrapper for argv[0] handling
When using qemu's linux-user binaries through binfmt, argv[0] gets lost along the execution because qemu only gets passed in the full file name to the executable while argv[0] can be something completely different. This breaks in some subtile situations, such as the grep and make test suites. This patch adds a wrapper binary called qemu-$TARGET-binfmt that can be used with binfmt's P flag which passes the full path _and_ argv[0] to the binfmt handler. The binary would be smart enough to be versatile and only exist in the system once, creating the qemu binary path names from its own argv[0]. However, this seemed like it didn't fit the make system too well, so we're currently creating a new binary for each target archictecture. CC: Reinhard Max <max@suse.de> Signed-off-by: Alexander Graf <agraf@suse.de> [AF: Rebased onto new Makefile infrastructure, twice] [AF: Updated for aarch64 for v2.0.0-rc1] [AF: Rebased onto Makefile changes for v2.1.0-rc0] Signed-off-by: Andreas Färber <afaerber@suse.de>
-rw-r--r--Makefile.target13
-rw-r--r--linux-user/Makefile.objs2
-rw-r--r--linux-user/binfmt.c42
-rw-r--r--scripts/qemu-binfmt-conf.sh36
4 files changed, 75 insertions, 18 deletions
diff --git a/Makefile.target b/Makefile.target
index e9ff1ee..8372b29 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -34,6 +34,10 @@ endif
PROGS=$(QEMU_PROG) $(QEMU_PROGW)
STPFILES=
+ifdef CONFIG_LINUX_USER
+PROGS+=$(QEMU_PROG)-binfmt
+endif
+
config-target.h: config-target.h-timestamp
config-target.h-timestamp: config-target.mak
@@ -108,6 +112,8 @@ QEMU_CFLAGS+=-I$(SRC_PATH)/linux-user/$(TARGET_ABI_DIR) -I$(SRC_PATH)/linux-user
obj-y += linux-user/
obj-y += gdbstub.o thunk.o user-exec.o
+obj-binfmt-y += linux-user/
+
endif #CONFIG_LINUX_USER
#########################################################
@@ -156,7 +162,11 @@ endif # CONFIG_SOFTMMU
# Workaround for http://gcc.gnu.org/PR55489, see configure.
%/translate.o: QEMU_CFLAGS += $(TRANSLATE_OPT_CFLAGS)
+ifdef CONFIG_LINUX_USER
+dummy := $(call unnest-vars,,obj-y obj-binfmt-y)
+else
dummy := $(call unnest-vars,,obj-y)
+endif
all-obj-y := $(obj-y)
target-obj-y :=
@@ -179,6 +189,9 @@ all-obj-$(CONFIG_SOFTMMU) += $(block-obj-y)
$(QEMU_PROG_BUILD): $(all-obj-y) ../libqemuutil.a ../libqemustub.a
$(call LINK,$^)
+$(QEMU_PROG)-binfmt: $(obj-binfmt-y)
+ $(call LINK,$^)
+
gdbstub-xml.c: $(TARGET_XML_FILES) $(SRC_PATH)/scripts/feature_to_c.sh
$(call quiet-command,rm -f $@ && $(SHELL) $(SRC_PATH)/scripts/feature_to_c.sh $@ $(TARGET_XML_FILES)," GEN $(TARGET_DIR)$@")
diff --git a/linux-user/Makefile.objs b/linux-user/Makefile.objs
index fd50217..446aca7 100644
--- a/linux-user/Makefile.objs
+++ b/linux-user/Makefile.objs
@@ -5,3 +5,5 @@ obj-$(TARGET_HAS_BFLT) += flatload.o
obj-$(TARGET_I386) += vm86.o
obj-$(TARGET_ARM) += arm/nwfpe/
obj-$(TARGET_M68K) += m68k-sim.o
+
+obj-binfmt-y = binfmt.o
diff --git a/linux-user/binfmt.c b/linux-user/binfmt.c
new file mode 100644
index 0000000..cd1f513
--- /dev/null
+++ b/linux-user/binfmt.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <libgen.h>
+#include <string.h>
+#include <stdlib.h>
+
+
+int main(int argc, char **argv, char **envp)
+{
+ char *binfmt;
+ char **new_argv;
+
+ /*
+ * Check if our file name ends with -binfmt
+ */
+ binfmt = argv[0] + strlen(argv[0]) - strlen("-binfmt");
+ if (strcmp(binfmt, "-binfmt")) {
+ fprintf(stderr, "%s: Invalid executable name\n", argv[0]);
+ exit(1);
+ }
+ if (argc < 3) {
+ fprintf(stderr, "%s: Please use me through binfmt with P flag\n",
+ argv[0]);
+ exit(1);
+ }
+
+ binfmt[0] = '\0';
+ /* Now argv[0] is the real qemu binary name */
+
+ new_argv = (char **)malloc((argc + 2) * sizeof(*new_argv));
+ if (argc > 3) {
+ memcpy(&new_argv[4], &argv[3], (argc - 3) * sizeof(*new_argv));
+ }
+ new_argv[0] = argv[0];
+ new_argv[1] = (char *)"-0";
+ new_argv[2] = argv[2];
+ new_argv[3] = argv[1];
+ new_argv[argc + 1] = NULL;
+
+ return execve(new_argv[0], new_argv, envp);
+}
diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
index 75e0526..557dd2c 100644
--- a/scripts/qemu-binfmt-conf.sh
+++ b/scripts/qemu-binfmt-conf.sh
@@ -34,42 +34,42 @@ esac
# register the interpreter for each cpu except for the native one
if [ $cpu != "i386" ] ; then
- echo ':i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-i386:' > /proc/sys/fs/binfmt_misc/register
- echo ':i486:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-i386:' > /proc/sys/fs/binfmt_misc/register
+ echo ':i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-i386-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':i486:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-i386-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "alpha" ] ; then
- echo ':alpha:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-alpha:' > /proc/sys/fs/binfmt_misc/register
+ echo ':alpha:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-alpha-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "arm" ] ; then
- echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm:' > /proc/sys/fs/binfmt_misc/register
- echo ':armeb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-armeb:' > /proc/sys/fs/binfmt_misc/register
+ echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':armeb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-armeb-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "aarch64" ] ; then
- echo ':aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-aarch64:' > /proc/sys/fs/binfmt_misc/register
+ echo ':aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-aarch64-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "sparc" ] ; then
- echo ':sparc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-sparc:' > /proc/sys/fs/binfmt_misc/register
+ echo ':sparc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-sparc-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "ppc" ] ; then
- echo ':ppc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-ppc:' > /proc/sys/fs/binfmt_misc/register
+ echo ':ppc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-ppc-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "m68k" ] ; then
echo 'Please check cpu value and header information for m68k!'
- echo ':m68k:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-m68k:' > /proc/sys/fs/binfmt_misc/register
+ echo ':m68k:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-m68k-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "mips" ] ; then
# FIXME: We could use the other endianness on a MIPS host.
- echo ':mips:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-mips:' > /proc/sys/fs/binfmt_misc/register
- echo ':mipsel:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-mipsel:' > /proc/sys/fs/binfmt_misc/register
- echo ':mipsn32:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-mipsn32:' > /proc/sys/fs/binfmt_misc/register
- echo ':mipsn32el:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-mipsn32el:' > /proc/sys/fs/binfmt_misc/register
- echo ':mips64:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-mips64:' > /proc/sys/fs/binfmt_misc/register
- echo ':mips64el:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-mips64el:' > /proc/sys/fs/binfmt_misc/register
+ echo ':mips:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-mips-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':mipsel:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-mipsel-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':mipsn32:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-mipsn32-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':mipsn32el:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-mipsn32el-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':mips64:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-mips64-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':mips64el:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-mips64el-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "sh" ] ; then
- echo ':sh4:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-sh4:' > /proc/sys/fs/binfmt_misc/register
- echo ':sh4eb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-sh4eb:' > /proc/sys/fs/binfmt_misc/register
+ echo ':sh4:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-sh4-binfmt:P' > /proc/sys/fs/binfmt_misc/register
+ echo ':sh4eb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-sh4eb-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi
if [ $cpu != "s390x" ] ; then
- echo ':s390x:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-s390x:' > /proc/sys/fs/binfmt_misc/register
+ echo ':s390x:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/bin/qemu-s390x-binfmt:P' > /proc/sys/fs/binfmt_misc/register
fi