From nobody Mon Apr 13 20:07:33 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21150C433FE for ; Wed, 16 Nov 2022 08:07:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233184AbiKPIHt (ORCPT ); Wed, 16 Nov 2022 03:07:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233137AbiKPIHl (ORCPT ); Wed, 16 Nov 2022 03:07:41 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id F3CCB6583 for ; Wed, 16 Nov 2022 00:07:31 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8BxHLdCmnRjHbIHAA--.10830S3; Wed, 16 Nov 2022 16:07:30 +0800 (CST) Received: from localhost.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Dx9VY6mnRjQ54UAA--.36317S4; Wed, 16 Nov 2022 16:07:26 +0800 (CST) From: Qing Zhang To: Huacai Chen , Steven Rostedt , Ingo Molnar Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v8 2/9] LoongArch/ftrace: Add recordmcount support Date: Wed, 16 Nov 2022 16:07:15 +0800 Message-Id: <20221116080722.4745-3-zhangqing@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221116080722.4745-1-zhangqing@loongson.cn> References: <20221116080722.4745-1-zhangqing@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8Dx9VY6mnRjQ54UAA--.36317S4 X-CM-SenderInfo: x2kd0wptlqwqxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBjvJXoWxGr4UXFWrZr4xAFy8ury8Zrb_yoW5CrWDpr 4qvFyrJFs2qryfG3ZIy348ur15Zas7Kr4Svryfta1FyFyDXrZ5Gr47JrnrWFyUCrykJ34x WF4F9ry8ua1UJw7anT9S1TB71UUUUjUqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU baxYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4 x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1l n4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6x ACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5McIj6I8E 87Iv67AKxVWxJVW8Jr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxAIw2 8IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI1I0E14v26r1Y6r17MI8I 3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxV WUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r4j6ryUMIIF0xvE2Ix0cI8I cVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aV AFwI0_Cr0_Gr1UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZF pf9x07j8a9-UUUUU= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Recordmcount utility under scripts is run, after compiling each object, to find out all the locations of calling _mcount() and put them into specific seciton named __mcount_loc. Then linker collects all such information into a table in the kernel image (between __start_mcount_loc and __stop_mcount_loc) for later use by ftrace. This patch adds loongarch specific definitions to identify such locations. On loongarch, only C version is used to build the kernel now that CONFIG_HAVE_C_RECORDMCOUNT is on. Signed-off-by: Qing Zhang --- arch/loongarch/Kconfig | 2 ++ scripts/recordmcount.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 92c4ec8c8527..e6b1defca1f1 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -86,11 +86,13 @@ config LOONGARCH select HAVE_ARCH_TRANSPARENT_HUGEPAGE select HAVE_ASM_MODVERSIONS select HAVE_CONTEXT_TRACKING_USER + select HAVE_C_RECORDMCOUNT select HAVE_DEBUG_STACKOVERFLOW select HAVE_DMA_CONTIGUOUS select HAVE_EBPF_JIT select HAVE_EXIT_THREAD select HAVE_FAST_GUP + select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_TRACER select HAVE_GENERIC_VDSO diff --git a/scripts/recordmcount.c b/scripts/recordmcount.c index cce12e1971d8..ae42f9c5dc42 100644 --- a/scripts/recordmcount.c +++ b/scripts/recordmcount.c @@ -38,6 +38,13 @@ #define R_AARCH64_ABS64 257 #endif =20 +#ifndef EM_LOONGARCH +#define EM_LOONGARCH 258 +#define R_LARCH_64 2 +#define R_LARCH_MARK_LA 20 +#define R_LARCH_SOP_PUSH_PLT_PCREL 29 +#endif + #define R_ARM_PC24 1 #define R_ARM_THM_CALL 10 #define R_ARM_CALL 28 @@ -441,6 +448,17 @@ static int arm64_is_fake_mcount(Elf64_Rel const *rp) return ELF64_R_TYPE(w8(rp->r_info)) !=3D R_AARCH64_CALL26; } =20 +static int LARCH64_is_fake_mcount(Elf64_Rel const *rp) +{ + switch (ELF64_R_TYPE(w(rp->r_info))) { + case R_LARCH_MARK_LA: + case R_LARCH_SOP_PUSH_PLT_PCREL: + return 0; + } + + return 1; +} + /* 64-bit EM_MIPS has weird ELF64_Rela.r_info. * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-= 001.pdf * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.4= 0] @@ -558,6 +576,7 @@ static int do_file(char const *const fname) break; case EM_IA_64: reltype =3D R_IA64_IMM64; break; case EM_MIPS: /* reltype: e_class */ break; + case EM_LOONGARCH: /* reltype: e_class */ break; case EM_PPC: reltype =3D R_PPC_ADDR32; break; case EM_PPC64: reltype =3D R_PPC64_ADDR64; break; case EM_S390: /* reltype: e_class */ break; @@ -610,6 +629,10 @@ static int do_file(char const *const fname) Elf64_r_info =3D MIPS64_r_info; is_fake_mcount64 =3D MIPS64_is_fake_mcount; } + if (w2(ghdr->e_machine) =3D=3D EM_LOONGARCH) { + reltype =3D R_LARCH_64; + is_fake_mcount64 =3D LARCH64_is_fake_mcount; + } if (do64(ghdr, fname, reltype) < 0) goto out; break; --=20 2.36.0