From: Guillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
To: Avi Kivity <avi@redhat.com>
Cc: kvm <kvm@vger.kernel.org>
Subject: Re: [Patch 4/5] x86_emulator: add the assembler code for three operands
Date: Tue, 25 Nov 2008 08:59:18 +0100 [thread overview]
Message-ID: <20081125085918.45bb29d2@frecb000711> (raw)
In-Reply-To: <4910222A.20201@redhat.com>
On Tue, 04 Nov 2008 12:21:30 +0200
Avi Kivity <avi@redhat.com> wrote:
> Guillaume Thouvenin wrote:
> > Add the assembler code for three operands
> >
> >
> > +/* Instruction has three operands */
> > +/* In the switch we only implement case 4 because we know that for shld instruction
> > + * bytes are equal to 4. When eveything will be fine, we will add others cases.
> >
>
> No, shld is defined for 16, 32, and 64 bit operands. Need to implement
> those too.
I tried something like:
+/* Instruction has three operands */
+/* In the switch we only implement case 4 because we know that for shld instruction
+ * bytes are equal to 4. When eveything will be fine, we will add others cases.
+ */
+#define __emulate_2op_cl(_op,_src,_src2,_dst,_eflags,_by,_bx,_wx,_wy,_lx,_ly,_qx,_qy) \
+ do { \
+ unsigned long _tmp; \
+ \
+ switch((_dst).bytes) { \
+ case 2: \
+ __asm__ __volatile__ ( \
+ _PRE_EFLAGS("0", "5", "2") \
+ "mov %4, %%rcx \n\t" \
+ _op"w %%cl,%3,%1; \n\t" \
+ _POST_EFLAGS("0", "5", "2") \
+ : "=m" (_eflags), "=m" ((_dst).val), \
+ "=&r" (_tmp) \
+ : _wy ((_src).val) , _wy ((_src2).val), "i" (EFLAGS_MASK) \
+ : "%rcx" ); \
+ break; \
+ case 4: \
+ __asm__ __volatile__ ( \
+ _PRE_EFLAGS("0", "5", "2") \
+ "mov %4, %%rcx \n\t" \
+ _op"l %%cl,%3,%1; \n\t" \
+ _POST_EFLAGS("0", "5", "2") \
+ : "=m" (_eflags), "=m" ((_dst).val), \
+ "=&r" (_tmp) \
+ : _ly ((_src).val) , _ly ((_src2).val), "i" (EFLAGS_MASK) \
+ : "%rcx" ); \
+ break; \
+ case 8: \
+ __asm__ __volatile__ ( \
+ _PRE_EFLAGS("0", "5", "2") \
+ "mov %4, %%rcx \n\t" \
+ _op"q %%cl,%3,%1; \n\t" \
+ _POST_EFLAGS("0", "5", "2") \
+ : "=m" (_eflags), "=m" ((_dst).val), \
+ "=&r" (_tmp) \
+ : _ly ((_src).val) , _ly ((_src2).val), "i" (EFLAGS_MASK) \
+ : "%rcx" ); \
+ break; \
+ } \
+ } while (0)
+
+#define emulate_2op_cl(_op, _src, _src2, _dst, _eflags) \
+ __emulate_2op_cl(_op, _src, _src2, _dst, _eflags, \
+ "b", "r", "b", "r", "b", "r", "b", "r")
+
but it doesn't work because shld can not be used with suffix 'l' or 'w'
etc... Is the solution is to have a single case for all operand size like:
+#define __emulate_2op_cl(_op,_src,_src2,_dst,_eflags,_wx,_wy) \
+ do { \
+ unsigned long _tmp; \
+ \
+ __asm__ __volatile__ ( \
+ _PRE_EFLAGS("0", "5", "2") \
+ "mov %4, %%rcx \n\t" \
+ _op" %%cl,%3,%1; \n\t" \
+ _POST_EFLAGS("0", "5", "2") \
+ : "=m" (_eflags), "=m" ((_dst).val), \
+ "=&r" (_tmp) \
+ : _wy ((_src).val) , _wy ((_src2).val), "i" (EFLAGS_MASK) \
+ : "%rcx" ); \
+ } while (0)
I tested the code and it seems to work.
Excuse me for the delay of this answer,
Regards,
Guillaume
next prev parent reply other threads:[~2008-11-25 7:59 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-03 15:00 [RFC Patch 0/5] x86_emulator: emulate shld and shrd instruction Guillaume Thouvenin
2008-11-03 15:01 ` [Patch 1/5] x86_emulator: Extend the opcode descriptor Guillaume Thouvenin
2008-11-03 15:02 ` [Patch 2/5] x86_emulator: add Src2 decode set Guillaume Thouvenin
2008-11-03 15:03 ` [Patch 3/5] x86_emulator: add a new "implied 1" Src decode type Guillaume Thouvenin
2008-11-03 15:04 ` [Patch 5/5] x86_emulator: add the emulation of shld and shrd instructions Guillaume Thouvenin
2008-11-03 15:05 ` [Patch 4/5] x86_emulator: add the assembler code for three operands Guillaume Thouvenin
2008-11-04 10:21 ` Avi Kivity
2008-11-25 7:59 ` Guillaume Thouvenin [this message]
2008-11-25 14:59 ` Avi Kivity
2008-11-26 11:59 ` Guillaume Thouvenin
2008-11-26 12:50 ` Avi Kivity
2008-12-03 15:00 ` Guillaume Thouvenin
2008-11-04 10:23 ` [RFC Patch 0/5] x86_emulator: emulate shld and shrd instruction Avi Kivity
-- strict thread matches above, loose matches on Subject: below --
2008-12-04 13:24 [Patch 0/5] x86_emulator: emulate shld and shrd instructions Guillaume Thouvenin
2008-12-04 13:29 ` [Patch 4/5] x86_emulator: add the assembler code for three operands Guillaume Thouvenin
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