[PATCH] riscv: Fix build against binutils 2.38

[Leo Liang]

Hi Alex,
On Thu, Feb 17, 2022 at 11:28:46AM +0100, Alexandre Ghiti wrote:
> Hi Leo,
> 
> On Thu, Feb 17, 2022 at 10:25 AM Leo Liang <ycliang at andestech.com> wrote:
> >
> > Hi Alexandre,
> > On Fri, Jan 28, 2022 at 02:47:13PM +0100, Alexandre Ghiti wrote:
> > > The following description is copied from the equivalent patch for the
> > > Linux Kernel proposed by Aurelien Jarno:
> > >
> > > From version 2.38, binutils default to ISA spec version 20191213. This
> > > means that the csr read/write (csrr*/csrw*) instructions and fence.i
> > > instruction has separated from the `I` extension, become two standalone
> > > extensions: Zicsr and Zifencei. As the kernel uses those instruction,
> > > this causes the following build failure:
> > >
> > > arch/riscv/cpu/mtrap.S: Assembler messages:
> > > arch/riscv/cpu/mtrap.S:65: Error: unrecognized opcode `csrr a0,scause'
> > > arch/riscv/cpu/mtrap.S:66: Error: unrecognized opcode `csrr a1,sepc'
> > > arch/riscv/cpu/mtrap.S:67: Error: unrecognized opcode `csrr a2,stval'
> > > arch/riscv/cpu/mtrap.S:70: Error: unrecognized opcode `csrw sepc,a0'
> > >
> > > Signed-off-by: Alexandre Ghiti <alexandre.ghiti at canonical.com>
> > > ---
> > >  arch/riscv/Makefile | 11 ++++++++++-
> > >  1 file changed, 10 insertions(+), 1 deletion(-)
> >
> > This patch seems to fail CI somehow.
> > (https://source.denx.de/u-boot/custodians/u-boot-riscv/-/pipelines/11004)
> >
> > Could you take a look at it ?
> 
> I have just tried on master (commit ab8903a24db1) and it failed for
> the same reason, so this is not related to this patch. Nevertheless,
> I'll try to bisect the problem :)
> 
> Thanks,
> 
> Alex
> 

Thanks for putting the effort into it!

AFAIK, this patch does nothing related to the error message "undefined reference to `__ashldi3'" from the failed CI.

Nonetheless, I have tried a few times myself, 
and found that CI could pass with ab8903a24db1 but cannot pass with this patch on my side.
https://source.denx.de/u-boot/custodians/u-boot-riscv/-/commits/staging
https://source.denx.de/u-boot/custodians/u-boot-riscv/-/pipelines

Best regards,
Leo

> >
> > Best regards,
> > Leo