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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 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 Content-Transfer-Encoding: 8bit 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: linux-arch@vger.kernel.org, Jonathan Corbet , linux-parisc@vger.kernel.org, linux-doc@vger.kernel.org, linux-sh@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, Jessica Yu , sparclinux@vger.kernel.org, linux-kbuild@vger.kernel.org, Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Changbin Du Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 -- 2.20.1