Let me further say that I know that the magic instructions are being
called. I am just getting bogus return values.
On Mon, Nov 9, 2020 at 2:18 PM Daniel Gerzhoy <daniel.gerz...@gmail.com>
wrote:
> Hi Matt,
>
> Thanks for this, it's very helpful. However after following the
> instructions (I had to extrapolate a little because of the directory
> structure changes you mentioned) I get the same result: Nill returns from
> the magic instructions.
> Actually It isn't nill, but a constant no matter what. If I compile my
> program with -O0 its nill, if with -O2 its: 4198192, which is suspicious.
>
> To clarify, are these updated instructions specifically meant to fix
> this issue I am running into? Or just general instructions to build m5op.o
>
> Here are the specific changes I made according to the link you provided,
> the supplemental instructions, and extrapolating based on the directory
> structure change.
>
> 1. In SConsopts I commented both:
>
> --- a/util/m5/src/abi/x86/SConsopts
> +++ b/util/m5/src/abi/x86/SConsopts
> @@ -27,8 +27,8 @@ Import('*')
>
> env['ABI'] = 'x86'
> get_abi_opt('CROSS_COMPILE', '')
> -env.Append(CXXFLAGS='-DM5OP_ADDR=0xFFFF0000')
> -env.Append(CCFLAGS='-DM5OP_ADDR=0xFFFF0000')
> +#env.Append(CXXFLAGS='-DM5OP_ADDR=0xFFFF0000')
> +#env.Append(CCFLAGS='-DM5OP_ADDR=0xFFFF0000')
>
> env['CALL_TYPE']['inst'].impl('m5op.S', 'verify_inst.cc')
> env['CALL_TYPE']['addr'].impl('m5op_addr.S', default=True)
>
> 2. In SConstruct I added:
>
> --- a/util/m5/SConstruct
> +++ b/util/m5/SConstruct
> @@ -44,7 +44,9 @@ def abspath(d):
>
> # Universal settings.
> main.Append(CXXFLAGS=[ '-O2' ])
> +main.Append(CXXFLAGS=[ '-std=c++11' ])
> main.Append(CCFLAGS=[ '-O2' ])
> main.Append(CPPPATH=[ common_include ])
>
> The compilation process compiles m5op.S with gcc though, so c++11 doesn't
> have any effect on it. Not sure if that matters.
>
> 3. Finally I linked both m5_mmap.o and m5op.o as per the instructions but
> I am a little wary of m5_mmap
>
> What does m5_mmap actually do if I don't have M5OP_ADDR defined. It looks
> like nothing? Do I need to link it?
>
> *Is there something inside the program I need to do before calling magic
> instructions that has to do with m5_mmap?*
>
> Thanks for your help,
>
> Dan
>
> On Mon, Nov 9, 2020 at 12:12 PM Matt Sinclair <mattdsincl...@gmail.com>
> wrote:
>
>> Hi Dan,
>>
>> In recent weeks, Gabe (if I recall correctly) updated how the m5ops are
>> created. I had created a homework assignment for my course about it:
>> https://pages.cs.wisc.edu/~sinclair/courses/cs752/fall2020/handouts/hw3.html
>> (see #2), but this is now already out of date as the location of some files
>> changed. The updated instructions are:
>>
>> 1. Update $GEM5_ROOT/util/m5/SConstruct, add a new line between the
>> current lines 46 and 47:
>>
>> main.Append(CXXFLAGS=[ '-O2' ])
>> *+main.Append(CXXFLAGS=[ '-std=c++11' ])*
>>
>> main.Append(CCFLAGS=[ '-O2' ])
>>
>> 2. Now run the same command you ran in step 2 of the above link:
>>
>> scons build/x86/out/m5
>>
>> 3. This will create the same two .o files in step 2 of the above link,
>> in the same places (although the location of m5op.o may have changed to
>> include/gem5 util/m5/build/x86/abi/x86/ according to some of the
>> students in my course).
>> Matt
>>
>> On Mon, Nov 9, 2020 at 9:25 AM Daniel Gerzhoy via gem5-users <
>> gem5-users@gem5.org> wrote:
>>
>>> Hey all,
>>>
>>> I've recently updated to using the dev branch for my GCN3 simulations.
>>> I've noticed that I am now getting return values of 0 for every magic
>>> instruction (m5_rpns for instance).
>>>
>>> Is there a special way I need to be compiling/linking m5ops.S to get the
>>> return values to show up correctly? Or might this be a bug?
>>>
>>> Thanks,
>>>
>>> Dan
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>>
>>
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