public inbox for
 help / color / mirror / Atom feed
From: Hau Hsu <>
Subject: [PATCH] RISC-V: Initialize the jvt CSR
Date: Mon, 25 Sep 2023 13:36:57 +0800	[thread overview]
Message-ID: <> (raw)

We set symbol '__jvt_base$' as weak. So if the symbol is not set in the
linker script, the address would be 0. We initialize jvt CSR only if
the address is not 0.

psabi reference:
 libgloss/riscv/crt0.S | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libgloss/riscv/crt0.S b/libgloss/riscv/crt0.S
index 7a4e4e32c..4744ba039 100644
--- a/libgloss/riscv/crt0.S
+++ b/libgloss/riscv/crt0.S
@@ -26,6 +26,16 @@ _start:
   addi  gp, gp, %pcrel_lo(1b)
 .option pop
+  /* Initialize jvt CSR */
+  .weak __jvt_base$
+.option push
+.option arch, +zcmt, +zicsr
+  lla a0, __jvt_base$
+  beqz a0, .Ljvt_init_end
+  csrw jvt, a0
+.option pop
   # Clear the bss segment
   la      a0, __bss_start
   la      a2, _end

             reply	other threads:[~2023-09-25  5:37 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-25  5:36 Hau Hsu [this message]
2023-09-25  6:17 ` Kito Cheng
2023-09-27  1:17   ` Hau Hsu
2023-09-29  2:26 ` Kito Cheng
2024-01-05  3:07 Hau Hsu
2024-01-05  6:49 ` Kito Cheng

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).