From patchwork Sun Jul 14 08:27:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naveen N Rao X-Patchwork-Id: 1960291 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=PcI1piYa; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=patchwork.ozlabs.org) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4WMJWV70Ztz1xqc for ; Sun, 14 Jul 2024 18:33:26 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=PcI1piYa; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WMJWV5w02z3d8S for ; Sun, 14 Jul 2024 18:33:26 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=PcI1piYa; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=139.178.84.217; helo=dfw.source.kernel.org; envelope-from=naveen@kernel.org; receiver=lists.ozlabs.org) Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4WMJQp1PtWz3cfn for ; Sun, 14 Jul 2024 18:29:22 +1000 (AEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 633FF60B4E; Sun, 14 Jul 2024 08:29:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76279C4AF09; Sun, 14 Jul 2024 08:29:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720945760; bh=u9jgla6YbJDeyFGkMjt0JK9jjbDJbcx+QV5+4gHm0hc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PcI1piYakO5jIXRHsyUWUmAt0rINQfbMsa2lH8SuH3XdNYLhPpwg8KMtrL89RHVdA ZVjtQFqmXQECfrEBbbSwmi3YuvDNKQGVrpEdvj+JE6Y4coSo18Ac/exrhAMepSGOwW 1VmN3wPcSNpN0xLLGxL2zXPvC2VHjlDKJBds5L8AkUXkG/0abGZC/ZHWU7VHrb86lI w7RW4hlpGBj9Xy6D+IzJWsPW5U51KX4ec96PryNONYGulLkeXp+NmvArXlEMCy06nB bMPDCDoRmh7Xb+D9mypH7fUj9/ShZTtctVUYLqwv0/nmMy34COJv0ZAYdIHDvYI97U hA2kXSEvg/8zA== From: Naveen N Rao To: , , , linux-kbuild@vger.kernel.org, Subject: [RFC PATCH v4 16/17] samples/ftrace: Add support for ftrace direct samples on powerpc Date: Sun, 14 Jul 2024 13:57:52 +0530 Message-ID: <1ecbd80f9d91dcf1f3a283a14fce7d3c3a0a0f71.1720942106.git.naveen@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Daniel Borkmann , Masahiro Yamada , Nicholas Piggin , Alexei Starovoitov , Steven Rostedt , Andrii Nakryiko , Christophe Leroy , Vishal Chourasia , Mahesh Salgaonkar , Hari Bathini , Masami Hiramatsu Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Add powerpc 32-bit and 64-bit samples for ftrace direct. This serves to show the sample instruction sequence to be used by ftrace direct calls to adhere to the ftrace ABI. On 64-bit powerpc, TOC setup requires some additional work. Signed-off-by: Naveen N Rao --- arch/powerpc/Kconfig | 2 + samples/ftrace/ftrace-direct-modify.c | 85 +++++++++++++++- samples/ftrace/ftrace-direct-multi-modify.c | 101 +++++++++++++++++++- samples/ftrace/ftrace-direct-multi.c | 79 ++++++++++++++- samples/ftrace/ftrace-direct-too.c | 83 +++++++++++++++- samples/ftrace/ftrace-direct.c | 69 ++++++++++++- 6 files changed, 414 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 29aab3770415..f6ff44acf112 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -275,6 +275,8 @@ config PPC select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE select HAVE_RSEQ + select HAVE_SAMPLE_FTRACE_DIRECT if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS + select HAVE_SAMPLE_FTRACE_DIRECT_MULTI if HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS select HAVE_SETUP_PER_CPU_AREA if PPC64 select HAVE_SOFTIRQ_ON_OWN_STACK select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) diff --git a/samples/ftrace/ftrace-direct-modify.c b/samples/ftrace/ftrace-direct-modify.c index 81220390851a..cfea7a38befb 100644 --- a/samples/ftrace/ftrace-direct-modify.c +++ b/samples/ftrace/ftrace-direct-modify.c @@ -2,7 +2,7 @@ #include #include #include -#ifndef CONFIG_ARM64 +#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32) #include #endif @@ -199,6 +199,89 @@ asm ( #endif /* CONFIG_LOONGARCH */ +#ifdef CONFIG_PPC +#include + +#ifdef CONFIG_PPC64 +#define STACK_FRAME_SIZE 48 +#else +#define STACK_FRAME_SIZE 24 +#endif + +#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL) +#define PPC64_TOC_SAVE_AND_UPDATE \ +" std 2, 24(1)\n" \ +" bcl 20, 31, 1f\n" \ +" 1: mflr 12\n" \ +" ld 2, (99f - 1b)(12)\n" +#define PPC64_TOC_RESTORE \ +" ld 2, 24(1)\n" +#define PPC64_TOC \ +" 99: .quad .TOC.@tocbase\n" +#else +#define PPC64_TOC_SAVE_AND_UPDATE "" +#define PPC64_TOC_RESTORE "" +#define PPC64_TOC "" +#endif + +#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtlr 0\n" +#define PPC_FTRACE_RET \ +" blr\n" +#else +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtctr 0\n" +#define PPC_FTRACE_RET \ +" mtlr 0\n" \ +" bctr\n" +#endif + +asm ( +" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp1, @function\n" +" .globl my_tramp1\n" +" my_tramp1:\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mflr 0\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n" + PPC64_TOC_SAVE_AND_UPDATE +" bl my_direct_func1\n" + PPC64_TOC_RESTORE +" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n" + PPC_FTRACE_RESTORE_LR +" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n" + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_FTRACE_RET +" .size my_tramp1, .-my_tramp1\n" + +" .type my_tramp2, @function\n" +" .globl my_tramp2\n" +" my_tramp2:\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mflr 0\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n" + PPC64_TOC_SAVE_AND_UPDATE +" bl my_direct_func2\n" + PPC64_TOC_RESTORE +" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n" + PPC_FTRACE_RESTORE_LR +" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n" + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_FTRACE_RET + PPC64_TOC +" .size my_tramp2, .-my_tramp2\n" +" .popsection\n" +); + +#endif /* CONFIG_PPC */ + static struct ftrace_ops direct; static unsigned long my_tramp = (unsigned long)my_tramp1; diff --git a/samples/ftrace/ftrace-direct-multi-modify.c b/samples/ftrace/ftrace-direct-multi-modify.c index f943e40d57fd..8f7986d698d8 100644 --- a/samples/ftrace/ftrace-direct-multi-modify.c +++ b/samples/ftrace/ftrace-direct-multi-modify.c @@ -2,7 +2,7 @@ #include #include #include -#ifndef CONFIG_ARM64 +#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32) #include #endif @@ -225,6 +225,105 @@ asm ( #endif /* CONFIG_LOONGARCH */ +#ifdef CONFIG_PPC +#include + +#ifdef CONFIG_PPC64 +#define STACK_FRAME_SIZE 48 +#else +#define STACK_FRAME_SIZE 24 +#endif + +#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL) +#define PPC64_TOC_SAVE_AND_UPDATE \ +" std 2, 24(1)\n" \ +" bcl 20, 31, 1f\n" \ +" 1: mflr 12\n" \ +" ld 2, (99f - 1b)(12)\n" +#define PPC64_TOC_RESTORE \ +" ld 2, 24(1)\n" +#define PPC64_TOC \ +" 99: .quad .TOC.@tocbase\n" +#else +#define PPC64_TOC_SAVE_AND_UPDATE "" +#define PPC64_TOC_RESTORE "" +#define PPC64_TOC "" +#endif + +#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtlr 0\n" +#define PPC_FTRACE_RET \ +" blr\n" +#define PPC_FTRACE_RECOVER_IP \ +" lwz 8, 4(3)\n" \ +" li 9, 6\n" \ +" slw 8, 8, 9\n" \ +" sraw 8, 8, 9\n" \ +" add 3, 3, 8\n" \ +" addi 3, 3, 4\n" +#else +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtctr 0\n" +#define PPC_FTRACE_RET \ +" mtlr 0\n" \ +" bctr\n" +#define PPC_FTRACE_RECOVER_IP "" +#endif + +asm ( +" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp1, @function\n" +" .globl my_tramp1\n" +" my_tramp1:\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mflr 0\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n" + PPC64_TOC_SAVE_AND_UPDATE + PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mr 3, 0\n" + PPC_FTRACE_RECOVER_IP +" bl my_direct_func1\n" + PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" + PPC64_TOC_RESTORE +" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n" + PPC_FTRACE_RESTORE_LR +" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n" + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_FTRACE_RET +" .size my_tramp1, .-my_tramp1\n" + +" .type my_tramp2, @function\n" +" .globl my_tramp2\n" +" my_tramp2:\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mflr 0\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n" + PPC64_TOC_SAVE_AND_UPDATE + PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mr 3, 0\n" + PPC_FTRACE_RECOVER_IP +" bl my_direct_func2\n" + PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" + PPC64_TOC_RESTORE +" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n" + PPC_FTRACE_RESTORE_LR +" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n" + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_FTRACE_RET + PPC64_TOC + " .size my_tramp2, .-my_tramp2\n" +" .popsection\n" +); + +#endif /* CONFIG_PPC */ + static unsigned long my_tramp = (unsigned long)my_tramp1; static unsigned long tramps[2] = { (unsigned long)my_tramp1, diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c index aed6df2927ce..db326c81a27d 100644 --- a/samples/ftrace/ftrace-direct-multi.c +++ b/samples/ftrace/ftrace-direct-multi.c @@ -4,7 +4,7 @@ #include /* for handle_mm_fault() */ #include #include -#ifndef CONFIG_ARM64 +#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32) #include #endif @@ -141,6 +141,83 @@ asm ( #endif /* CONFIG_LOONGARCH */ +#ifdef CONFIG_PPC +#include + +#ifdef CONFIG_PPC64 +#define STACK_FRAME_SIZE 48 +#else +#define STACK_FRAME_SIZE 24 +#endif + +#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL) +#define PPC64_TOC_SAVE_AND_UPDATE \ +" std 2, 24(1)\n" \ +" bcl 20, 31, 1f\n" \ +" 1: mflr 12\n" \ +" ld 2, (99f - 1b)(12)\n" +#define PPC64_TOC_RESTORE \ +" ld 2, 24(1)\n" +#define PPC64_TOC \ +" 99: .quad .TOC.@tocbase\n" +#else +#define PPC64_TOC_SAVE_AND_UPDATE "" +#define PPC64_TOC_RESTORE "" +#define PPC64_TOC "" +#endif + +#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtlr 0\n" +#define PPC_FTRACE_RET \ +" blr\n" +#define PPC_FTRACE_RECOVER_IP \ +" lwz 8, 4(3)\n" \ +" li 9, 6\n" \ +" slw 8, 8, 9\n" \ +" sraw 8, 8, 9\n" \ +" add 3, 3, 8\n" \ +" addi 3, 3, 4\n" +#else +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtctr 0\n" +#define PPC_FTRACE_RET \ +" mtlr 0\n" \ +" bctr\n" +#define PPC_FTRACE_RECOVER_IP "" +#endif + +asm ( +" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mflr 0\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n" + PPC64_TOC_SAVE_AND_UPDATE + PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mr 3, 0\n" + PPC_FTRACE_RECOVER_IP +" bl my_direct_func\n" + PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" + PPC64_TOC_RESTORE +" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n" + PPC_FTRACE_RESTORE_LR +" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n" + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_FTRACE_RET + PPC64_TOC +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_PPC */ + static struct ftrace_ops direct; static int __init ftrace_direct_multi_init(void) diff --git a/samples/ftrace/ftrace-direct-too.c b/samples/ftrace/ftrace-direct-too.c index 6ff546a5d7eb..3d0fa260332d 100644 --- a/samples/ftrace/ftrace-direct-too.c +++ b/samples/ftrace/ftrace-direct-too.c @@ -3,7 +3,7 @@ #include /* for handle_mm_fault() */ #include -#ifndef CONFIG_ARM64 +#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32) #include #endif @@ -153,6 +153,87 @@ asm ( #endif /* CONFIG_LOONGARCH */ +#ifdef CONFIG_PPC +#include + +#ifdef CONFIG_PPC64 +#define STACK_FRAME_SIZE 64 +#define STACK_FRAME_ARG1 32 +#define STACK_FRAME_ARG2 40 +#define STACK_FRAME_ARG3 48 +#define STACK_FRAME_ARG4 56 +#else +#define STACK_FRAME_SIZE 32 +#define STACK_FRAME_ARG1 16 +#define STACK_FRAME_ARG2 20 +#define STACK_FRAME_ARG3 24 +#define STACK_FRAME_ARG4 28 +#endif + +#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL) +#define PPC64_TOC_SAVE_AND_UPDATE \ +" std 2, 24(1)\n" \ +" bcl 20, 31, 1f\n" \ +" 1: mflr 12\n" \ +" ld 2, (99f - 1b)(12)\n" +#define PPC64_TOC_RESTORE \ +" ld 2, 24(1)\n" +#define PPC64_TOC \ +" 99: .quad .TOC.@tocbase\n" +#else +#define PPC64_TOC_SAVE_AND_UPDATE "" +#define PPC64_TOC_RESTORE "" +#define PPC64_TOC "" +#endif + +#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtlr 0\n" +#define PPC_FTRACE_RET \ +" blr\n" +#else +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtctr 0\n" +#define PPC_FTRACE_RET \ +" mtlr 0\n" \ +" bctr\n" +#endif + +asm ( +" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mflr 0\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n" + PPC64_TOC_SAVE_AND_UPDATE + PPC_STL" 3, "__stringify(STACK_FRAME_ARG1)"(1)\n" + PPC_STL" 4, "__stringify(STACK_FRAME_ARG2)"(1)\n" + PPC_STL" 5, "__stringify(STACK_FRAME_ARG3)"(1)\n" + PPC_STL" 6, "__stringify(STACK_FRAME_ARG4)"(1)\n" +" bl my_direct_func\n" + PPC_LL" 6, "__stringify(STACK_FRAME_ARG4)"(1)\n" + PPC_LL" 5, "__stringify(STACK_FRAME_ARG3)"(1)\n" + PPC_LL" 4, "__stringify(STACK_FRAME_ARG2)"(1)\n" + PPC_LL" 3, "__stringify(STACK_FRAME_ARG1)"(1)\n" + PPC64_TOC_RESTORE +" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n" + PPC_FTRACE_RESTORE_LR +" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n" + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_FTRACE_RET + PPC64_TOC +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_PPC */ + static struct ftrace_ops direct; static int __init ftrace_direct_init(void) diff --git a/samples/ftrace/ftrace-direct.c b/samples/ftrace/ftrace-direct.c index ef0945670e1e..956834b0d19a 100644 --- a/samples/ftrace/ftrace-direct.c +++ b/samples/ftrace/ftrace-direct.c @@ -3,7 +3,7 @@ #include /* for wake_up_process() */ #include -#ifndef CONFIG_ARM64 +#if !defined(CONFIG_ARM64) && !defined(CONFIG_PPC32) #include #endif @@ -134,6 +134,73 @@ asm ( #endif /* CONFIG_LOONGARCH */ +#ifdef CONFIG_PPC +#include + +#ifdef CONFIG_PPC64 +#define STACK_FRAME_SIZE 48 +#else +#define STACK_FRAME_SIZE 24 +#endif + +#if defined(CONFIG_PPC64_ELF_ABI_V2) && !defined(CONFIG_PPC_KERNEL_PCREL) +#define PPC64_TOC_SAVE_AND_UPDATE \ +" std 2, 24(1)\n" \ +" bcl 20, 31, 1f\n" \ +" 1: mflr 12\n" \ +" ld 2, (99f - 1b)(12)\n" +#define PPC64_TOC_RESTORE \ +" ld 2, 24(1)\n" +#define PPC64_TOC \ +" 99: .quad .TOC.@tocbase\n" +#else +#define PPC64_TOC_SAVE_AND_UPDATE "" +#define PPC64_TOC_RESTORE "" +#define PPC64_TOC "" +#endif + +#ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtlr 0\n" +#define PPC_FTRACE_RET \ +" blr\n" +#else +#define PPC_FTRACE_RESTORE_LR \ + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" \ +" mtctr 0\n" +#define PPC_FTRACE_RET \ +" mtlr 0\n" \ +" bctr\n" +#endif + +asm ( +" .pushsection .text, \"ax\", @progbits\n" +" .type my_tramp, @function\n" +" .globl my_tramp\n" +" my_tramp:\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" mflr 0\n" + PPC_STL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_STLU" 1, -"__stringify(STACK_FRAME_SIZE)"(1)\n" + PPC64_TOC_SAVE_AND_UPDATE + PPC_STL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" +" bl my_direct_func\n" + PPC_LL" 3, "__stringify(STACK_FRAME_MIN_SIZE)"(1)\n" + PPC64_TOC_RESTORE +" addi 1, 1, "__stringify(STACK_FRAME_SIZE)"\n" + PPC_FTRACE_RESTORE_LR +" addi 1, 1, "__stringify(STACK_FRAME_MIN_SIZE)"\n" + PPC_LL" 0, "__stringify(PPC_LR_STKOFF)"(1)\n" + PPC_FTRACE_RET + PPC64_TOC +" .size my_tramp, .-my_tramp\n" +" .popsection\n" +); + +#endif /* CONFIG_PPC */ + static struct ftrace_ops direct; static int __init ftrace_direct_init(void)