I can reproduce this bug, but I'm not sure what QEMU is doing wrong.
Looking at the "SH4 Software Manual", it definitely says that if the
FPSCR.PR bit is 0 then the 'frchg' and 'fschg' instructions should both
trap.
The 'frchg' that autogen is hitting is the one in glibc's "getcontext"
implementa
I can provide access to a machine connected to the internet so you can
test it yourself. I'll send you an email.
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https://bugs.launchpad.net/bugs/1796520
Title:
autogen crashes on qemu
On that hardware, at least, the user-space visible FPSCR value is indeed
0x00080. Execution of the 'frchg' insn either doesn't trap, or the
trap is caught by the kernel and emulated. I think it is not being
emulated because CONFIG_SH_FPU_EMU is not set.
The comment at the top of arch/sh/kernel
(Edit to note that "that hardware" is an SH7785LCR with an SH7785 CPU.)
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https://bugs.launchpad.net/bugs/1796520
Title:
autogen crashes on qemu-sh4-user after 61dedf2af7
Status in QEM
We can ask both glibc upstream and some SuperH experts. I'll ask.
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https://bugs.launchpad.net/bugs/1796520
Title:
autogen crashes on qemu-sh4-user after 61dedf2af7
Status in QEMU:
C
** Changed in: qemu
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1796520
Title:
autogen crashes on qemu-sh4-user after 61dedf2af7
Status in QEMU:
Confirmed
Bug
This is still reproducible on git master:
(sid-sh4-sbuild)root@nofan:/# autogen
Unhandled trap: 0x180
pc=0x7f4da99e sr=0x pr=0x7f3bfc74 fpscr=0x0008
spc=0x ssr=0x gbr=0x7f114320 vbr=0x
sgr=0x dbr=0x delayed_pc=0x7f4da960 fpul=0x0003
r0=0x7ffc
** Tags added: linux-user sh4
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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 "auto
