[Qemu-devel] [Bug 1344320] Re: qemu-aarch64 cannot execute glibc

[Peter Maydell]

The kernel folks tell me that the generic timers being userspace
accessible is only for the benefit of the kernel's VDSO, and they're not
part of the kernel-to-userspace contract. This is therefore a bug in
glibc, not QEMU, and we should get glibc fixed.

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https://bugs.launchpad.net/bugs/1344320

Title:
  qemu-aarch64 cannot execute glibc

Status in QEMU:
  New

Bug description:
  $ aarch64-linux-user/qemu-aarch64 -version
  qemu-aarch64 version 2.0.92, Copyright (c) 2003-2008 Fabrice Bellard
  $ aarch64-linux-user/qemu-aarch64 -d in_asm 
/daten/build/build-root/home/abuild/rpmbuild/BUILD/glibc-2.19.90/cc-base/elf/ld-linux-aarch64.so.1
 
  host mmap_min_addr=0x10000
  guest_base  0x0
  start            end              size             prot
  0000004000000000-000000400001e000 000000000001e000 r-x
  000000400001e000-000000400002e000 0000000000010000 ---
  000000400002e000-0000004000031000 0000000000003000 rw-
  0000004000031000-0000004000032000 0000000000001000 ---
  0000004000032000-0000004000832000 0000000000800000 rw-
  start_brk   0x0000000000000000
  end_code    0x000000400001dbe0
  start_code  0x0000004000000000
  start_data  0x000000400002eba8
  end_data    0x0000004000030008
  start_stack 0x0000004000830a10
  brk         0x0000004000030170
  entry       0x00000040000012c0
  ----------------
  IN: 
  0x00000040000012c0:  910003e0      mov x0, sp
  0x00000040000012c4:  94000d4f      bl #+0x353c (addr 0x7fffb5bdad68)

  ----------------
  IN: _dl_start
  0x0000004000004800:  d11243ff      sub sp, sp, #0x490 (1168)
  0x0000004000004804:  a9ba7bfd      stp x29, x30, [sp, #-96]!
  0x0000004000004808:  910003fd      mov x29, sp
  0x000000400000480c:  a9046bf9      stp x25, x26, [sp, #64]
  0x0000004000004810:  a90153f3      stp x19, x20, [sp, #16]
  0x0000004000004814:  a9025bf5      stp x21, x22, [sp, #32]
  0x0000004000004818:  a90363f7      stp x23, x24, [sp, #48]
  0x000000400000481c:  a90573fb      stp x27, x28, [sp, #80]
  0x0000004000004820:  aa0003fa      mov x26, x0
  0x0000004000004824:  d5033fdf      isb
  0x0000004000004828:  d53be040      mrs x0, (unknown)

  qemu: uncaught target signal 4 (Illegal instruction) - core dumped
  Illegal instruction
  $ objdump -d 
/daten/build/build-root/home/abuild/rpmbuild/BUILD/glibc-2.19.90/cc-base/elf/ld-linux-aarch64.so.1
 | grep ' 4828:'
      4828:       d53be040        mrs     x0, cntvct_el0

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