[Qemu-devel] [Bug 1796520] Re: autogen crashes on qemu-sh4-user after 61dedf2af7

[John Paul Adrian Glaubitz]

This is still reproducible on git master:

(sid-sh4-sbuild)address@hidden:/# autogen
Unhandled trap: 0x180
pc=0x7f4da99e sr=0x00000000 pr=0x7f3bfc74 fpscr=0x00080000
spc=0x00000000 ssr=0x00000000 gbr=0x7f114320 vbr=0x00000000
sgr=0x00000000 dbr=0x00000000 delayed_pc=0x7f4da960 fpul=0x00000003
r0=0x7ffc130c r1=0x00000000 r2=0xffff5dc4 r3=0x7f7bfb54
r4=0x7ffc121c r5=0x7ffc1408 r6=0x000003ff r7=0x00000000
r8=0x00000004 r9=0x7f3e80bc r10=0x7ffc1408 r11=0x7f3e88f0
r12=0x7f3e8258 r13=0x7f3f0e1c r14=0x00000804 r15=0x7ffc120c
r16=0x00000000 r17=0x00000000 r18=0x00000000 r19=0x00000000
r20=0x00000000 r21=0x00000000 r22=0x00000000 r23=0x00000000
(sid-sh4-sbuild)address@hidden:/#

Can we just revert 61dedf2af7 which fixes the problem?

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https://bugs.launchpad.net/bugs/1796520

Title:
  autogen crashes on qemu-sh4-user after 61dedf2af7

Status in QEMU:
  New

Bug description:
  Running "autogen --help" crashes on qemu-sh4-user with:

  (sid-sh4-sbuild)address@hidden:/# autogen --help
  Unhandled trap: 0x180
  pc=0xf64dd2de sr=0x00000000 pr=0xf63b9c74 fpscr=0x00080000
  spc=0x00000000 ssr=0x00000000 gbr=0xf61102a8 vbr=0x00000000
  sgr=0x00000000 dbr=0x00000000 delayed_pc=0xf64dd2a0 fpul=0x00000003
  r0=0xf6fc1320 r1=0x00000000 r2=0xffff5dc4 r3=0xf67bfb50
  r4=0xf6fc1230 r5=0xf6fc141c r6=0x000003ff r7=0x00000000
  r8=0x00000004 r9=0xf63e20bc r10=0xf6fc141c r11=0xf63e28f0
  r12=0xf63e2258 r13=0xf63eae1c r14=0x00000804 r15=0xf6fc1220
  r16=0x00000000 r17=0x00000000 r18=0x00000000 r19=0x00000000
  r20=0x00000000 r21=0x00000000 r22=0x00000000 r23=0x00000000
  (sid-sh4-sbuild)address@hidden:/#

  Bi-secting found this commit to be the culprit:

  61dedf2af79fb5866dc7a0f972093682f2185e17 is the first bad commit
  commit 61dedf2af79fb5866dc7a0f972093682f2185e17
  Author: Richard Henderson <address@hidden>
  Date:   Tue Jul 18 10:02:50 2017 -1000

      target/sh4: Add missing FPSCR.PR == 0 checks
      
      Both frchg and fschg require PR == 0, otherwise undefined_operation.
      
      Reviewed-by: Aurelien Jarno <address@hidden>
      Signed-off-by: Richard Henderson <address@hidden>
      Message-Id: <address@hidden>
      Signed-off-by: Aurelien Jarno <address@hidden>

  :040000 040000 980d79b69ae712f23a1e4c56983e97a843153b4a
  1024c109f506c7ad57367c63bc8bbbc8a7a36cd7 M      target

  Reverting 61dedf2af79fb5866dc7a0f972093682f2185e17 fixes the problem
  for me.

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