Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756323AbZKIPdY (ORCPT ); Mon, 9 Nov 2009 10:33:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756289AbZKIPdU (ORCPT ); Mon, 9 Nov 2009 10:33:20 -0500 Received: from mail-ew0-f207.google.com ([209.85.219.207]:39623 "EHLO mail-ew0-f207.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756211AbZKIPdT (ORCPT ); Mon, 9 Nov 2009 10:33:19 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=lVtkcz7ysmvaeZDX9ySGM2aoS/ASpAIcr54s+5pIyGvkl+I+YunFLNwvvnjFMVL+U8 HxrdSgmY/umTh5Rc8PWtUMWSZRJs8qjmXAlSfN+nni81VTq/5z2Nuv238xidqIO23XG/ Hz4ooMw532NgnX3O4HaNxFycmHrINSbZO/3C0= From: Wu Zhangjin To: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org Cc: zhangfx@lemote.com, zhouqg@gmail.com, Wu Zhangjin , Ralf Baechle , rostedt@goodmis.org, Frederic Weisbecker , Ingo Molnar , Nicholas Mc Guire , David Daney , Richard Sandiford , Patrik Kluba , Thomas Gleixner , Michal Simek Subject: [PATCH v7 13/17] tracing: add dynamic function graph tracer for MIPS Date: Mon, 9 Nov 2009 23:31:30 +0800 Message-Id: <0c463e2af521e613fd15751a9f610c74cf887292.1257779502.git.wuzhangjin@gmail.com> X-Mailer: git-send-email 1.6.2.1 In-Reply-To: <451c55dead5d6afd871de6afd14dbbcf70a0f834.1257779502.git.wuzhangjin@gmail.com> References: <9dc81a7a9e5a292cccdf465c533a2b08d19d6021.1257779502.git.wuzhangjin@gmail.com> <8f579e2cece16cd22358a4ec143ef6a8c462639b.1257779502.git.wuzhangjin@gmail.com> <6199d7b3956b544fc65896af1062787a2e1283ce.1257779502.git.wuzhangjin@gmail.com> <58a7558730fbea6cd0417100c8fcd6f45668d1e3.1257779502.git.wuzhangjin@gmail.com> <3a9fc9ca02e8e6e9c3c28797a4c084c1f9d91f69.1257779502.git.wuzhangjin@gmail.com> <0cef783a71333ff96a78aaea8961e3b6b5392665.1257779502.git.wuzhangjin@gmail.com> <18e1d617ed824bb1c10f15216f2ed9ed3de78abd.1257779502.git.wuzhangjin@gmail.com> <3da916c1cb6e05445438826f98a91111f43ff6cd.1257779502.git.wuzhangjin@gmail.com> <451c55dead5d6afd871de6afd14dbbcf70a0f834.1257779502.git.wuzhangjin@gmail.com> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2785 Lines: 90 From: Wu Zhangjin This patch make function graph tracer work with dynamic function tracer. To share the source code of dynamic function tracer(MCOUNT_SAVE_REGS), and avoid restoring the whole saved registers, we need to restore the ra register from the stack. (NOTE: This not work with 32bit! need to ensure why!) Signed-off-by: Wu Zhangjin --- arch/mips/kernel/ftrace.c | 21 +++++++++++++++++++++ arch/mips/kernel/mcount.S | 14 ++++++++++++-- 2 files changed, 33 insertions(+), 2 deletions(-) diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c index 50ba128..af3ceed 100644 --- a/arch/mips/kernel/ftrace.c +++ b/arch/mips/kernel/ftrace.c @@ -92,6 +92,27 @@ int __init ftrace_dyn_arch_init(void *data) #ifdef CONFIG_FUNCTION_GRAPH_TRACER +#ifdef CONFIG_DYNAMIC_FTRACE + +extern void ftrace_graph_call(void); +#define JMP 0x08000000 /* jump to target directly */ +#define CALL_FTRACE_GRAPH_CALLER \ + jump_insn_encode(JMP, (unsigned long)(&ftrace_graph_caller)) +#define FTRACE_GRAPH_CALL_IP ((unsigned long)(&ftrace_graph_call)) + +int ftrace_enable_ftrace_graph_caller(void) +{ + return ftrace_modify_code(FTRACE_GRAPH_CALL_IP, + CALL_FTRACE_GRAPH_CALLER); +} + +int ftrace_disable_ftrace_graph_caller(void) +{ + return ftrace_modify_code(FTRACE_GRAPH_CALL_IP, ftrace_nop); +} + +#endif /* !CONFIG_DYNAMIC_FTRACE */ + #define S_RA_SP (0xafbf << 16) /* s{d,w} ra, offset(sp) */ #define S_R_SP (0xafb0 << 16) /* s{d,w} R, offset(sp) */ #define OFFSET_MASK 0xffff /* stack offset range: 0 ~ PT_SIZE */ diff --git a/arch/mips/kernel/mcount.S b/arch/mips/kernel/mcount.S index b50e38d..98d4690 100644 --- a/arch/mips/kernel/mcount.S +++ b/arch/mips/kernel/mcount.S @@ -77,6 +77,13 @@ ftrace_call: nop /* a placeholder for the call to a real tracing function */ move a1, AT /* arg2: the caller's next ip, parent */ +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + .globl ftrace_graph_call +ftrace_graph_call: + nop + nop +#endif + MCOUNT_RESTORE_REGS .globl ftrace_stub ftrace_stub: @@ -124,10 +131,13 @@ ftrace_stub: #ifdef CONFIG_FUNCTION_GRAPH_TRACER NESTED(ftrace_graph_caller, PT_SIZE, ra) +#ifdef CONFIG_DYNAMIC_FTRACE + PTR_L a1, PT_R31(sp) /* load the original ra from the stack */ +#else MCOUNT_SAVE_REGS - - PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */ move a1, ra /* arg2: next ip, selfaddr */ +#endif + PTR_LA a0, PT_R1(sp) /* arg1: &AT -> a0 */ jal prepare_ftrace_return move a2, fp /* arg3: frame pointer */ -- 1.6.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/