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From: Leo Liang <ycliang@andestech.com>
To: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Cc: Rick Chen <rick@andestech.com>, <u-boot@lists.denx.de>
Subject: Re: [PATCH 1/1] cmd/exception: support RISC-V compressed instruction
Date: Tue, 26 Sep 2023 15:47:25 +0800	[thread overview]
Message-ID: <ZRKMjRnh52d9aB60@swlinux02> (raw)
In-Reply-To: <20230921084218.57260-1-heinrich.schuchardt@canonical.com>

On Thu, Sep 21, 2023 at 10:42:18AM +0200, Heinrich Schuchardt wrote:
> Eliminating the C extension on application processors is under
> discussion.
> 
> Support emitting a compressed instruction. This will lead to an
> illegal instruction exception if the C extension is not implemented.
> 
> For testing build qemu-riscv64_defconfig with CONFIG_RISCV_ISA_C=n
> and run with
> 
>     qemu-system-riscv64 -M virt -bios u-boot -nographic -cpu rv64,c=false
> 
>     => exception compressed
>     Unhandled exception: Illegal instruction
>     EPC: 0000000087731708 RA: 000000008773fe44 TVAL: 0000000000004501
>     EPC: 000000008001b708 RA: 0000000080029e44 reloc adjusted
> 
>     Code: 0b93 0000 0493 0000 0993 0000 f06f ccdf (4501)
> 
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
> ---
>  cmd/riscv/exception.c | 18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)

Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>

      reply	other threads:[~2023-09-26  7:48 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-21  8:42 [PATCH 1/1] cmd/exception: support RISC-V compressed instruction Heinrich Schuchardt
2023-09-26  7:47 ` Leo Liang [this message]

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