GSoC 2019: POSIX Compliance - FENV Environment probably not working properly in RISCV
Jiri Gaisler
jiri at gaisler.se
Wed Aug 14 07:18:30 UTC 2019
I have attached the sis manual. Page 17:
"SIS can be connected to gdb through a network socket using the gdb remote interface.
Either start SIS with -gdb, or issue the ’gdb’ command inside SIS, and connect gdb with
’target extended-remote localhost:1234’. The port can be changed using the -port option."
You still need all other options, so to start on a windows host do:
$ riscv-rtems-sis -riscv -nouartrx -gdb
To start gdb, do:
$ riscv-rtems-gdb app.exe
(gdb) target extended-remote localhost:1234
(gdb) load
(gdb) run
To re-run the application, issue a new load command first.
Regards, Jiri.
On 8/14/19 12:37 AM, Vaibhav Gupta wrote:
>
>
> On Wed, Aug 14, 2019 at 4:04 AM Joel Sherrill <joel at rtems.org <mailto:joel at rtems.org>> wrote:
>
>
>
> On Tue, Aug 13, 2019 at 5:09 PM Vaibhav Gupta <vaibhavgupta40 at gmail.com <mailto:vaibhavgupta40 at gmail.com>> wrote:
>
>
>
> On Mon, Aug 12, 2019 at 11:50 PM Joel Sherrill <joel at rtems.org <mailto:joel at rtems.org>> wrote:
>
> Can you post or email me privately the full patch? I can try to see what I spot.
>
> I have sent you the patch.
>
>
> Can you check with objdump or gdb that the methods which don't appear to work
> are actually the RISC-V implementation? Look at the disassembly and see if it
> looks like you expect.
>
> I am exploring for this.
>
>
> Since I don't know how to attach gdb to the new sis for griscv, I emailed Jiri privately.
> Your program works as expected on Linux. Perhaps Jiri has some advice for my
> debugging setup ignorance and fenv on RISC-V.
>
> Okay, I will wait. Till then I can work with porting for other architecture. :)
>
>
> Do you happen to have fenv support for another architecture queued up? It would be
> interesting to see if it works on other targets.
>
> Yup, they were in my to do list. Till testsuite method is solved, I will work on them now.
>
> - Vaibhav Gupta
>
>
> --joel
>
>
>
> - Vaibhav Gupta
>
>
> Does this require a patch to newlib as well?
>
> --joel
>
> On Sun, Aug 11, 2019 at 10:49 AM Vaibhav Gupta <vaibhavgupta40 at gmail.com <mailto:vaibhavgupta40 at gmail.com>> wrote:
>
> Configure command I used to build BSP:
> ==============================================
> $ /home/varodek/development/rtems/kernel/rtems/configure --prefix=/home/varodek/development/rtems/5 --enable-maintainer-mode --target=riscv-rtems5 --enable-rtemsbsp=rv32imac --enable-tests --enable-posix --disable-networking --enable-cxx RISCV_ENABLE_HTIF_SUPPORT=1
> ==============================================
> .
> .
> .
> .
> Qemu command I used to run test:
> ==============================================
> $ qemu-system-riscv32 -no-reboot -nographic -machine virt -m 256M -kernel psxfenv01.exe
> ==============================================
> .
> .
> .
> .
> Makefile.am
> ==============================================
> + if TEST_psxfenv01
> + psx_tests += psxfenv01
> + psxfenv01_SOURCES = psxfenv01/init.c
> + psxfenv01_CPPFLAGS = $(AM_CPPFLAGS) $(TEST_FLAGS_psxfenv01) \
> + $(support_includes)
> + psxfenv01_LDADD = -lm $(LDADD)
> + endif
> +
> ==============================================
>
> On Sun, Aug 11, 2019 at 8:36 PM Vaibhav Gupta <vaibhavgupta40 at gmail.com <mailto:vaibhavgupta40 at gmail.com>> wrote:
>
> My code of testsuite:
> ===============================================
> /* Test 'FE_DIVBYZERO' */
> puts( "\nDivide by zero and confirm fetestexcept()." );
> a = 0.0;
> b = 1.0;
> c = b/a;
> printf("\n%d",FE_DIVBYZERO);
> fegetexceptflag(&excepts,FE_ALL_EXCEPT);
> printf("\n%d",excepts);
> r = feraiseexcept(FE_DIVBYZERO);
> printf("\n%d\n",r);
> rtems_test_assert( fetestexcept( FE_DIVBYZERO ) );
> ==============================================
> OUTPUT
> ==============================================
> Divide by zero and confirm fetestexcept().
>
> 8
> 0
> 1
> /home/varodek/development/rtems/kernel/rtems/c/src/../../testsuites/psxtests/psxfenv01/init.c: 84 fetestexcept( FE_DIVBYZERO )
> ==============================================
> EXPECTED OUTPUT
> ==============================================
> Divide by zero and confirm fetestexcept().
>
> 8
> 8
> 0
> ==============================================
> - fetestexcept( FE_DIVBYZERO ), should return a non-zero value as division-by-zero was performed.
> .
> - feraiseexcept(FE_DIVBYZERO); is also not working. It should return zero when successful
> .
> ==============================================
>
> Thank You
> Vaibhav Gupta
>
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