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target-alpha: Tidy exception constants.

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There's no need to attempt to match EXCP_* values with PALcode entry
point offsets.  Instead, compress all the values to make for more
efficient switch statements within QEMU.

We will be doing TLB fill within QEMU proper, not within the PALcode,
so all of the ITB/DTB miss, double fault, and access exceptions can
be compressed to EXCP_MMFAULT.

Compress all of the EXCP_CALL_PAL exceptions into one.
Use env->error_code to store the specific entry point.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2011-05-20 14:04:57 -07:00 • committed by Richard Henderson
parent b758aca1f6
commit 07b6c13b09
4 changed files with 31 additions and 56 deletions
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5
target-alpha/helper.c
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@ -164,10 +164,7 @@ void cpu_alpha_store_fpcr (CPUState *env, uint64_t val)
int cpu_alpha_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
int mmu_idx, int is_softmmu)
{
if (rw == 2)
env->exception_index = EXCP_ITB_MISS;
else
env->exception_index = EXCP_DFAULT;
env->exception_index = EXCP_MMFAULT;
env->trap_arg0 = address;
return 1;
}