From nobody Fri Apr 10 22:06:43 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 030E2C25B0E for ; Fri, 19 Aug 2022 08:14:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347571AbiHSIOm (ORCPT ); Fri, 19 Aug 2022 04:14:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47190 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347530AbiHSIOX (ORCPT ); Fri, 19 Aug 2022 04:14:23 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B27B348C9A; Fri, 19 Aug 2022 01:14:16 -0700 (PDT) Received: from localhost.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxT+BLRv9i9I0EAA--.22658S4; Fri, 19 Aug 2022 16:14:08 +0800 (CST) From: Qing Zhang To: Huacai Chen , Steven Rostedt , Ingo Molnar Cc: WANG Xuerui , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Jiaxun Yang , hejinyang@loongson.cn, zhangqing@loongson.cn Subject: [PATCH 2/9] LoongArch/ftrace: Add recordmcount support Date: Fri, 19 Aug 2022 16:13:56 +0800 Message-Id: <20220819081403.7143-3-zhangqing@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220819081403.7143-1-zhangqing@loongson.cn> References: <20220819081403.7143-1-zhangqing@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8CxT+BLRv9i9I0EAA--.22658S4 X-Coremail-Antispam: 1UD129KBjvJXoWxGr4UXFWrZr4xAFy8ury8Zrb_yoW5Cr4kpr ZF9FWrJFs2qryfG3ZIy348ur15Zas2kr4fZryfta1FyFyDXrZ5GrsrJrnrWFyUCrykJ34x WF4F9ry8ua1UJw7anT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUPC14x267AKxVWrJVCq3wAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jryl82xGYIkIc2 x26xkF7I0E14v26r4j6ryUM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJw A2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_GcCE3s1l e2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI 8IcVAFwI0_Jrv_JF1lYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJVW8JwAC jcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2Y2ka0x kIwI1lc2xSY4AK67AK6r43MxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4U MI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67 AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r4j6ryUMIIF0xvE2Ix0 cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z2 80aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8JVW8JrUvcSsGvfC2KfnxnUUI 43ZEXa7sRRD73JUUUUU== X-CM-SenderInfo: x2kd0wptlqwqxorr0wxvrqhubq/ 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 703a2c3a8e0d..4d13bac368ed 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -80,10 +80,12 @@ 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_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 2.36.1