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+qemu user mode does not support binfmt_misc config with flags include "P"
+
+Hi Sir:
+During our test in chroot environment with qemu-user-static, we got some test cases failed because of program output warning with unexpected full path name.
+For example in test module "Devscripts"
+the test item for broken tarball expected the warning info:
+<tar: This does not look like a tar archive
+tar: ******* >
+but the output was:
+</bin/tar: This does not look like a tar archive
+/bin/tar: ******>
+the cause is the config file of binfmt_misc was set not to send argv0, for example:
+type command "tar" after chroot:
+==========================
+lpeng@lpeng-VirtualBox:~/projects_lpeng/qemu/mips_2/sid$ sudo chroot .
+[sudo] password for lpeng: 
+root@lpeng-VirtualBox:/# tar
+/bin/tar: You must specify one of the '-Acdtrux', '--delete' or '--test-label' options
+Try '/bin/tar --help' or '/bin/tar --usage' for more information.
+root@lpeng-VirtualBox:/# 
+===========================
+
+by adding output log in main()@qemu/Linux-user/main.c
+we found the original input command was changed, and qemu do not know that, we got the input args:
+argv_0----/usr/bin/qemu-mips64el-static---
+argv_1----/bin/tar---
+argv_2----NULL---
+
+Next step we modified the flags=P in the corresponding config under folder /proc/sys/fs/binfmt_misc, then binfmt_misc sent argv[0] to qemu.
+But chroot could not start bash because in current qemu dose not consider about this unexpected one more"argv[0]"
+
+
+After modified qemu code temporary to handle the new argv list we got the input args, and from argv[2] is the original input command
+argv_0----/usr/bin/qemu-mips64el-static---
+argv_1----/bin/tar---
+argv_2----tar---
+
+We need the original input from command line, so is it possible that let binfmt_misc to pass one more additional args or env to qemu as a token of the binfmt_misc flag, then qemu can judge how to parse the input args by it?
+looking forward your suggestions.
+
+Thanks
+luyou
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