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target-alpha: Set PC correctly for floating-point exceptions

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PC should be one past the faulting insn.  Add better commentary
for the machine-check exception path.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2014-06-28 13:06:19 -07:00
parent 9d5a626b2c
commit ba9c5de5f2
2 changed files with 10 additions and 1 deletions
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2
target-alpha/helper.c
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@ -571,6 +571,8 @@ void QEMU_NORETURN dynamic_excp(CPUAlphaState *env, uintptr_t retaddr,
env->error_code = error;
if (retaddr) {
cpu_restore_state(cs, retaddr);
/* Floating-point exceptions (our only users) point to the next PC. */
env->pc += 4;
}
cpu_loop_exit(cs);
}

9
target-alpha/mem_helper.c
View File

@ -128,7 +128,14 @@ void alpha_cpu_unassigned_access(CPUState *cs, hwaddr addr,
env->trap_arg0 = addr;
env->trap_arg1 = is_write ? 1 : 0;
dynamic_excp(env, 0, EXCP_MCHK, 0);
cs->exception_index = EXCP_MCHK;
env->error_code = 0;
/* ??? We should cpu_restore_state to the faulting insn, but this hook
does not have access to the retaddr value from the orignal helper.
It's all moot until the QEMU PALcode grows an MCHK handler. */
cpu_loop_exit(cs);
}
/* try to fill the TLB and return an exception if error. If retaddr is