Merge branch 'linux-user-for-upstream' of git://git.linaro.org/people/rikuvoipio...

* 'linux-user-for-upstream' of git://git.linaro.org/people/rikuvoipio/qemu:
  linux-user: Fix sa_flags byte swaps for mips
  linux-user: Define TARGET_QEMU_ESIGRETURN for mips64
  linux-user: Define TARGET_QEMU_ESIGRETURN for mipsn32
  linux-user: Add default configs for mips64[el]
  linux-user: Add default-configs for mipsn32[el]
  linux-user: Implement *listxattr syscalls
  linux-user/syscall.c: Implement f and l versions of set/get/removexattr
  linux-user: Allow NULL value pointer in setxattr and getxattr
  linux-user: fix wait* syscall status returns
  linux-user/strace.c: Correct errno printing for mmap etc
  linux-user: fix QEMU_STRACE=1 segfault
  linux-user: add SO_PEERCRED support for getsockopt
  linux-user/main.c: Add option to user-mode emulation so that user can specify log file name
  linux-user: fake /proc/self/auxv
  linux-user: fake /proc/self/stat
  linux-user: fake /proc/self/maps
  linux-user: add open() hijack infrastructure
  linux-user: save auxv length
  linux-user: stack_base is now mandatory on all targets