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From: Artyom Tarasenko <atar4qemu@googlemail.com>
Date: Mon, 19 Apr 2010 16:33:14 +0200
Message-ID: <y2ufb8d4f71004190733u703c62f5mdfddbab72b84e517@mail.gmail.com>
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Subject: [Qemu-devel] singlestep and sparc32
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To: qemu-devel <qemu-devel@nongnu.org>, weil@mail.berlios.de, Blue Swirl <blauwirbel@gmail.com>

is -single-step option supposed to work under qemu-system-sparc? Or is
it only for non-pipelined CPUs?

I get pretty strange results: some addresses seem to be executed
twice, and then qemu hangs on the last nop:

--------------
IN:
0x00000000:  b  0xb788
--------------
IN:
0x00000004:  rd  %psr, %l0
--------------
IN:
0x00000004:  rd  %psr, %l0
--------------
IN:
0x00000008:  nop
--------------
IN:
0x00000008:  nop
--------------
IN:
0x0000000c:  nop
--------------
IN:
0x0000000c:  nop

... skipped ...

IN:
0x7000a58c:  bg  0x7000a588
--------------
IN:
0x7000a590:  nop
--------------
IN:
0x7000a590:  nop
--------------
IN:
0x7000a594:  b  0x7000a570
--------------
IN:
0x7000a594:  b  0x7000a570
--------------
IN:
0x7000a578:  be  0x7000a59c
--------------
IN:
0x7000a580:  stba  %l1, [ %l0 ] #ASI_M_BYPASS
--------------
IN:
0x7000a588:  deccc  %l2
--------------
IN:
0x7000a594:  b  0x7000a570
--------------
IN:
0x7000a590:  nop

^^^^^^^^^^^ That's the end

Without -singlestep it seems to work better:


0x7000a588:  deccc  %l2
0x7000a58c:  bg  0x7000a588
0x7000a590:  nop

--------------
IN:
0x7000a594:  b  0x7000a570
0x7000a598:  inc  %l4

--------------
IN:
0x7000a570:  lduba  [ %l4 ] #ASI_M_KERNELTXT, %l1
0x7000a574:  cmp  %l1, 0xff
0x7000a578:  be  0x7000a59c
... and so on ...


-- 
Regards,
Artyom Tarasenko

solaris/sparc under qemu blog: http://tyom.blogspot.com/