* [Qemu-devel] tcg_target_prologue()
@ 2008-04-11 0:57 Stuart Brady
2008-04-11 9:32 ` Fabrice Bellard
0 siblings, 1 reply; 2+ messages in thread
From: Stuart Brady @ 2008-04-11 0:57 UTC (permalink / raw)
To: qemu-devel
Hi,
I recently tried using the C version of the TB call in cpu-exec.c,
"T0 = gen_func();", with HPPA host support. However, I must then save
the link register, or else it would be overwritten... but if I use
tcg_target_prologue(), I find that goto_tb sometimes jumps to the
prologue, but it sometimes jumps past the prologue, instead!
I've fixed the bug[1] that caused me to investigate this, so for the
time being, I'll continue calling TBs from inline assembly code, but it
might be nice to spare others the pain of trying tcg_target_prologue()
and failing. Any thoughts?
Cheers,
--
Stuart Brady
[1] Apparently, frame pointer registers are best marked 'reserved'.
Oops.
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [Qemu-devel] tcg_target_prologue()
2008-04-11 0:57 [Qemu-devel] tcg_target_prologue() Stuart Brady
@ 2008-04-11 9:32 ` Fabrice Bellard
0 siblings, 0 replies; 2+ messages in thread
From: Fabrice Bellard @ 2008-04-11 9:32 UTC (permalink / raw)
To: qemu-devel
Stuart Brady wrote:
> Hi,
>
> I recently tried using the C version of the TB call in cpu-exec.c,
> "T0 = gen_func();", with HPPA host support. However, I must then save
> the link register, or else it would be overwritten... but if I use
> tcg_target_prologue(), I find that goto_tb sometimes jumps to the
> prologue, but it sometimes jumps past the prologue, instead!
>
> I've fixed the bug[1] that caused me to investigate this, so for the
> time being, I'll continue calling TBs from inline assembly code, but it
> might be nice to spare others the pain of trying tcg_target_prologue()
> and failing. Any thoughts?
The real fix is in the TCG TODO list (global prologue and epilogue). I
will try to implement it ASAP.
Regards,
Fabrice.
^ permalink raw reply [flat|nested] 2+ messages in thread
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