From patchwork Sun Aug 25 13:23:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Changbin Du X-Patchwork-Id: 11113385 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2906414DB for ; Sun, 25 Aug 2019 13:25:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F1E2420850 for ; Sun, 25 Aug 2019 13:25:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="cOVJF79W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728672AbfHYNZA (ORCPT ); Sun, 25 Aug 2019 09:25:00 -0400 Received: from mail-pg1-f194.google.com ([209.85.215.194]:37602 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725922AbfHYNZA (ORCPT ); Sun, 25 Aug 2019 09:25:00 -0400 Received: by mail-pg1-f194.google.com with SMTP id d1so8750298pgp.4; Sun, 25 Aug 2019 06:24:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=JqpgoR8V6SjsIuqoJ+8NqdaMmEPfAbLAaPv+Hcgdg84=; b=cOVJF79WqvqKRT3ZXzzxuLNI4rbZt4lfbP6az49c1byhyK2QahOrqbSI2dB2fZhWCC xJCbft2VLYrbwdzXF9jIiXUwPyokyE/gLjMn6UbplIiyUIshSRGBh09bXozM15K1nsuc hVqsLwo8519kPAFe9mVCqIiwt6iUC7u7wKwV7QZ33C4FGl/cd3m96WtMvKbt7c4jcDwj QB3okZeBtzimdK2gKfpcMlyKmkszszsFr79e3wOM8/ErGZfWwWpwQlwOhcLgo9WKQzwE CO6qHnCy0oV9Gt51zgP/CeciV8d7/eTmq3bR5PhIONNKkekvCWxA77q6JHkEqqoviw1X t/Aw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=JqpgoR8V6SjsIuqoJ+8NqdaMmEPfAbLAaPv+Hcgdg84=; b=mOFXtfrojZMFj5GRx6aa/j0HTaIxCmvwElBjvtSDulFunj5iJOOxz7dkLlRv8EHmRr aa1Tc5ii+JEBm2wWFT5Sa0HLITvbi7OAvgjlzEBcpanowd5vRo45LzNYH9/3VMpyKsr4 QwNkHoDGNAb5boKHsefXht0Cuso3JulpCyreeEajwHYvEQktEnX1mjqBRvZe7WmA/iBc aR+KfSdGQUI6+kQHQ2/UoYqntLH5BNOU63TBOZ47yuVVG2tp0v08IqRXycWB6dTVXJiq KPGgFcRZ+ZAZnWMuTiPQqgPyOBagBAnMA/lWGjCXbTzXB3u6wLrAcTotiwcTN+wZBzVZ pESA== X-Gm-Message-State: APjAAAVwazIonjV+0hL9+BLBss6rFw8gtn5MA4EagCRk/LkBI0yqUd2a DzB5mB9m1JGnhoJRPUtFg+0= X-Google-Smtp-Source: APXvYqwQzM/nOUwplTcnKi74XFc9NcY/wLN6wqU0HucyOEq0vc6nrliugvK9Jha3kK8nxmI1irB8+w== X-Received: by 2002:a63:fb14:: with SMTP id o20mr11958817pgh.136.1566739498486; Sun, 25 Aug 2019 06:24:58 -0700 (PDT) Received: from localhost.localdomain ([149.28.153.17]) by smtp.gmail.com with ESMTPSA id y23sm11076562pfr.86.2019.08.25.06.24.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 25 Aug 2019 06:24:58 -0700 (PDT) From: Changbin Du To: Steven Rostedt , Ingo Molnar Cc: Jonathan Corbet , Jessica Yu , Thomas Gleixner , x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, linux-kbuild@vger.kernel.org, Changbin Du Subject: [PATCH 09/11] x86_64: add function prototype recording support Date: Sun, 25 Aug 2019 21:23:28 +0800 Message-Id: <20190825132330.5015-10-changbin.du@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190825132330.5015-1-changbin.du@gmail.com> References: <20190825132330.5015-1-changbin.du@gmail.com> MIME-Version: 1.0 Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org This patch implements the arch_fgraph_record_params() function for x86_64 platform and deliver the return value of function to ftrace core part. Signed-off-by: Changbin Du --- arch/x86/Kconfig | 1 + arch/x86/kernel/ftrace.c | 84 +++++++++++++++++++++++++++++++++++-- arch/x86/kernel/ftrace_64.S | 4 +- 3 files changed, 85 insertions(+), 4 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 222855cc0158..34e583bfdab8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -31,6 +31,7 @@ config X86_64 select NEED_DMA_MAP_STATE select SWIOTLB select ARCH_HAS_SYSCALL_WRAPPER + select HAVE_FTRACE_FUNC_PROTOTYPE config FORCE_DYNAMIC_FTRACE def_bool y diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index a044734167af..fc0a062ce762 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -31,6 +31,7 @@ #include #include #include +#include #ifdef CONFIG_DYNAMIC_FTRACE @@ -918,7 +919,8 @@ static void *addr_from_call(void *ptr) } void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent, - unsigned long frame_pointer); + unsigned long frame_pointer, + struct pt_regs *pt_regs); /* * If the ops->trampoline was not allocated, then it probably @@ -973,6 +975,82 @@ void arch_ftrace_trampoline_free(struct ftrace_ops *ops) ops->trampoline = 0; } +#ifdef CONFIG_FTRACE_FUNC_PROTOTYPE +void arch_fgraph_record_params(struct ftrace_graph_ent *trace, + struct func_prototype *proto, + struct pt_regs *pt_regs) +{ + int i; + + trace->nr_param = min(proto->nr_param, (uint8_t)FTRACE_MAX_FUNC_PARAMS); + + for (i = 0; i < trace->nr_param; i++) { + struct func_param *param = &proto->params[i]; + unsigned int sz = FTRACE_PROTOTYPE_SIZE(param->type); + long off = (char)param->loc[1]; + unsigned long value = 0; + bool good = true; + + if (sz > sizeof(value)) { + /* Don't record value of complex type. */ + trace->param_types[i] = param->type; + trace->param_values[i] = 0; + continue; + } + + switch (param->loc[0]) { + case DW_OP_reg1: + value = pt_regs->dx; + break; + case DW_OP_reg2: + value = pt_regs->cx; + break; + case DW_OP_reg3: + value = pt_regs->bx; + break; + case DW_OP_reg4: + value = pt_regs->si; + break; + case DW_OP_reg5: + value = pt_regs->di; + break; + case DW_OP_reg6: + value = pt_regs->bp; + break; + case DW_OP_reg8: + value = pt_regs->r8; + break; + case DW_OP_reg9: + value = pt_regs->r9; + break; + case DW_OP_fbreg: + if (probe_kernel_read(&value, + (void *)pt_regs->bp + off, + sz)) + good = false; + break; + case DW_OP_breg7: + if (probe_kernel_read(&value, + (void *)pt_regs->sp + off, + sz)) + good = false; + break; + default: + /* unexpected loc expression */ + good = false; + } + + trace->param_names[i] = param->name; + if (good) { + trace->param_types[i] = param->type; + trace->param_values[i] = value; + } else { + /* set the type to 0 so we skip it when printing. */ + trace->param_types[i] = 0; + } + } +} +#endif /* CONFIG_FTRACE_FUNC_PROTOTYPE */ #endif /* CONFIG_X86_64 */ #endif /* CONFIG_DYNAMIC_FTRACE */ @@ -1017,7 +1095,7 @@ int ftrace_disable_ftrace_graph_caller(void) * in current thread info. */ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent, - unsigned long frame_pointer) + unsigned long frame_pointer, struct pt_regs *pt_regs) { unsigned long old; int faulted; @@ -1072,7 +1150,7 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent, return; } - if (function_graph_enter(old, self_addr, frame_pointer, parent, NULL)) + if (function_graph_enter(old, self_addr, frame_pointer, parent, pt_regs)) *parent = old; } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S index 809d54397dba..e01d6358e859 100644 --- a/arch/x86/kernel/ftrace_64.S +++ b/arch/x86/kernel/ftrace_64.S @@ -289,7 +289,8 @@ ENTRY(ftrace_graph_caller) leaq MCOUNT_REG_SIZE+8(%rsp), %rsi movq $0, %rdx /* No framepointers needed */ - call prepare_ftrace_return + movq %rsp, %rcx /* the fourth parameter */ + call prepare_ftrace_return restore_mcount_regs @@ -304,6 +305,7 @@ ENTRY(return_to_handler) movq %rax, (%rsp) movq %rdx, 8(%rsp) movq %rbp, %rdi + movq %rax, %rsi call ftrace_return_to_handler