[Qemu-devel] [Bug 1716767] Re: file(1) fails with "Invalid argument" on qemu-sh4-user

[James Clarke]

With the attached patch, qemu-sh4-static now works for file:

address@hidden:/# /usr/bin/qemu-sh4-static.new2 /usr/bin/file /bin/bash
/bin/bash: ELF 32-bit LSB executable, Renesas SH, version 1 (SYSV), dynamically 
linked, interpreter /lib/ld-linux.so.2, 
BuildID[sha1]=579b7ca73585e30c022e6dec83666ecc746f7499, for GNU/Linux 3.2.0, 
stripped

** Patch added: 
"0001-linux-user-syscall.c-Handle-SH4-s-exceptional-alignm.patch"
   
https://bugs.launchpad.net/qemu/+bug/1716767/+attachment/4949652/+files/0001-linux-user-syscall.c-Handle-SH4-s-exceptional-alignm.patch

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https://bugs.launchpad.net/bugs/1716767

Title:
  file(1) fails with "Invalid argument" on qemu-sh4-user

Status in QEMU:
  New

Bug description:
  We recently discovered that file(1) fails on qemu-sh4-user when
  running on an ELF file:

  (sid_sh4)address@hidden:/# file /bin/bash
  /bin/bash: ERROR: ELF 32-bit LSB executable, Renesas SH, version 1 (SYSV) 
error reading (Invalid argument)
  (sid_sh4)address@hidden:/#

  Running with "-d" yields more output:

  (sid_sh4)address@hidden:/# file -d /bin/bash 2>&1 | tail
  322: >> 7 byte&,=97,"(ARM)"]
  0 == 97 = 0
  mget(type=1, flag=0, offset=7, o=0, nbytes=863324, il=0, nc=1)
  mget/96 @7: 
\000\000\000\000\000\000\000\000\000\002\000*\000\001\000\000\000\250\317A\0004\000\000\000L(\r\000\027\000\000\0004\000
 \000\n\000(address@hidden@address@hidden@address@hidden@\000\023\000\000

  323: >> 7 byte&,=-1,"(embedded)"]
  0 == 18446744073709551615 = 0
  [try softmagic 1]
  [try elf -1]
  /bin/bash: ERROR: ELF 32-bit LSB executable, Renesas SH, version 1 (SYSV) 
error reading (Invalid argument)
  (sid_sh4)address@hidden:/#

  It seems that the comparison above has a bogus (overflown?) value.

  On actual hardware, it works:

  address@hidden:~> file /bin/bash
  /bin/bash: ELF 32-bit LSB executable, Renesas SH, version 1 (SYSV), 
dynamically linked, interpreter /lib/ld-linux.so.2, 
BuildID[sha1]=4dd0e4281755827d8bb6686fd481f8c80ea73e9a, for GNU/Linux 3.2.0, 
stripped
  address@hidden:~>

  I have uploaded a chroot with Debian unstable which allows to
  reproduce the issue:

  > https://people.debian.org/~glaubitz/sid-sh4-sbuild.tar.gz

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