From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by sourceware.org (Postfix) with ESMTPS id 117BC3858CDA for ; Mon, 25 Sep 2023 05:37:27 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 117BC3858CDA Authentication-Results: sourceware.org; dmarc=pass (p=reject dis=none) header.from=sifive.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=sifive.com Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-690d25b1dbdso5019072b3a.2 for ; Sun, 24 Sep 2023 22:37:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1695620246; x=1696225046; darn=sourceware.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=eNJKNhwXGrUgsqQnAwrszsPeNKbbpcWhKSZs2WPhur0=; b=KVxp1CAOZz2Po9ICK/GxR//qSHr9Onx7rxkgxA1YfAG8bvv66S0E/TQS1Yi2TfgtgG +wH8KhaH2rDad+Z19tbppAr9WJc0qp+T8mh70gLFfBLjdCfbCP1/rzJXGS7W5Gu38NNZ FLmY0J853B2pkT/GGua9EaMVCemXYagKf02ownYNp1NIXiurlGfSJV9OlAku8YXwJ0Fb oA9iOS7EK99t4hPwYFXdSzNYQ5onAsJM+2yOIpj73zmEpuxyXnpyN866b8nhZ93jM1ZU ZZb93ZOV/tQ/VQYuxLMykTlHbf8Xb0iWC+xIXyKgLfF/u8/sH8XDvFjSxWR1RCsTMKqG cmuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695620246; x=1696225046; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=eNJKNhwXGrUgsqQnAwrszsPeNKbbpcWhKSZs2WPhur0=; b=QCCBu83HjArJeKwCT1av6Lw4fqyH+Cp/AOqgRibkiBZXiNiF8inRADRhejoAjAvpQW L71lv6Ema56pBRcGQMKTpamgp5reILCrWXTqou3tIWmEsycROIwlePUxhCRrW8iVPrPq gbQPVB7f7rgl35bbIz/ojVWuc7UX4nZvvzoWmIGJnG8A0ChgbRPcIi4PcRSSxYgXngZ6 pTCL949qs3liBBW80p9YH0CPQZhSpwqrKfr/Dgw/yABSISfIsw5+0egI9FySg0U57LjZ zeqUURd0uGZoXWBE685ySprGx8sQWZe+IUC4onXFk13XEtMy7QjHY7GRjrLIQr9AOPLi jt/w== X-Gm-Message-State: AOJu0YxFD6GaWN0wVvHnVBqIb/0xQYlTeUDmBE3ivXjSKbxjkVgsigSY DFs14dVev673AyCIXmM2XROM0g== X-Google-Smtp-Source: AGHT+IFZs3pHF2zTAgH1ioXX2ZlVgM6XN78THuhclA1ewe1/cVSw6WsFDlMTmx7TY29nUTDKlTHw+g== X-Received: by 2002:a05:6a00:21ce:b0:68f:b5a1:12bf with SMTP id t14-20020a056a0021ce00b0068fb5a112bfmr8062979pfj.29.1695620246087; Sun, 24 Sep 2023 22:37:26 -0700 (PDT) Received: from hsinchu15.internal.sifive.com (59-124-168-89.hinet-ip.hinet.net. [59.124.168.89]) by smtp.gmail.com with ESMTPSA id j14-20020aa78dce000000b006906aaf1e4dsm7171041pfr.150.2023.09.24.22.37.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 Sep 2023 22:37:25 -0700 (PDT) From: Hau Hsu To: hau.hsu@sifive.com, newlib@sourceware.org, kito.cheng@gmail.com Subject: [PATCH] RISC-V: Initialize the jvt CSR Date: Mon, 25 Sep 2023 13:36:57 +0800 Message-ID: <20230925053657.24959-1-hau.hsu@sifive.com> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.5 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: We set symbol '__jvt_base$' as weak. So if the symbol is not set in the linker script, the address would be 0. We initialize jvt CSR only if the address is not 0. psabi reference: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/2d770815dc9a8b11e61ea1abd487cb25ee56ad5e/riscv-elf.adoc#table-jump-relaxation --- libgloss/riscv/crt0.S | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/libgloss/riscv/crt0.S b/libgloss/riscv/crt0.S index 7a4e4e32c..4744ba039 100644 --- a/libgloss/riscv/crt0.S +++ b/libgloss/riscv/crt0.S @@ -26,6 +26,16 @@ _start: addi gp, gp, %pcrel_lo(1b) .option pop + /* Initialize jvt CSR */ + .weak __jvt_base$ +.option push +.option arch, +zcmt, +zicsr + lla a0, __jvt_base$ + beqz a0, .Ljvt_init_end + csrw jvt, a0 +.Ljvt_init_end: +.option pop + # Clear the bss segment la a0, __bss_start la a2, _end -- 2.42.0