Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755965AbaD1NMa (ORCPT ); Mon, 28 Apr 2014 09:12:30 -0400 Received: from mail-ee0-f54.google.com ([74.125.83.54]:38100 "EHLO mail-ee0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755747AbaD1NM2 (ORCPT ); Mon, 28 Apr 2014 09:12:28 -0400 From: Jean Pihet To: Will Deacon Cc: linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org, linux-arm-kernel@lists.infradead.org, Ingo Molnar , Jiri Olsa , patches@linaro.org, Arnaldo Carvalho de Melo , Jean Pihet , Steve Capper , Corey Ashford , Frederic Weisbecker , Namhyung Kim , Paul Mackerras , Peter Zijlstra , Arnaldo Carvalho de Melo , David Ahern Subject: [PATCH 1/3] perf tests: Introduce perf_regs_load function on ARM64 Date: Mon, 28 Apr 2014 15:12:10 +0200 Message-Id: <1398690730-5454-1-git-send-email-jean.pihet@linaro.org> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introducing perf_regs_load function, which is going to be used for dwarf unwind test in following patches. It takes single argument as a pointer to the regs dump buffer and populates it with current registers values, as expected by the perf built-in unwinding test. Signed-off-by: Jean Pihet Cc: Steve Capper Cc: Corey Ashford Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Arnaldo Carvalho de Melo Cc: David Ahern Cc: Jiri Olsa --- tools/perf/arch/arm64/Makefile | 1 + tools/perf/arch/arm64/include/perf_regs.h | 2 ++ tools/perf/arch/arm64/tests/regs_load.S | 40 +++++++++++++++++++++++++++++++ 3 files changed, 43 insertions(+) create mode 100644 tools/perf/arch/arm64/tests/regs_load.S diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile index 67e9b3d..9b8f87e 100644 --- a/tools/perf/arch/arm64/Makefile +++ b/tools/perf/arch/arm64/Makefile @@ -4,4 +4,5 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o endif ifndef NO_LIBUNWIND LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o endif diff --git a/tools/perf/arch/arm64/include/perf_regs.h b/tools/perf/arch/arm64/include/perf_regs.h index 2359546..1e052f1 100644 --- a/tools/perf/arch/arm64/include/perf_regs.h +++ b/tools/perf/arch/arm64/include/perf_regs.h @@ -9,6 +9,8 @@ #define PERF_REG_IP PERF_REG_ARM64_PC #define PERF_REG_SP PERF_REG_ARM64_SP +void perf_regs_load(u64 *regs); + static inline const char *perf_reg_name(int id) { switch (id) { diff --git a/tools/perf/arch/arm64/tests/regs_load.S b/tools/perf/arch/arm64/tests/regs_load.S new file mode 100644 index 0000000..40b8b99 --- /dev/null +++ b/tools/perf/arch/arm64/tests/regs_load.S @@ -0,0 +1,40 @@ +#include + +/* + * Implementation of void perf_regs_load(u64 *regs); + * + * This functions fills in the 'regs' buffer from the actual registers values, + * in the way the perf built-in unwinding test expects them, e.g. an address + * within the caller: + * - the PC at the time at the call to this function. Since this function + * is called using a bl instruction, the PC value is taken from LR, + * - the current SP (not touched by this function), + * - the current value of LR is merely retrieved and stored because the + * value before the call to this function is unknown at this time; it will + * be unwound from the dwarf information in unwind__get_entries. + */ + +.text +.type perf_regs_load,%function +ENTRY(perf_regs_load) + stp x0, x1, [x0], #16 // store x0..x29 + stp x2, x3, [x0], #16 + stp x4, x5, [x0], #16 + stp x6, x7, [x0], #16 + stp x8, x9, [x0], #16 + stp x10, x11, [x0], #16 + stp x12, x13, [x0], #16 + stp x14, x15, [x0], #16 + stp x16, x17, [x0], #16 + stp x18, x19, [x0], #16 + stp x20, x21, [x0], #16 + stp x22, x23, [x0], #16 + stp x24, x25, [x0], #16 + stp x26, x27, [x0], #16 + stp x28, x29, [x0], #16 + mov x1, sp + stp x30, x1, [x0], #16 // store lr and sp + str x30, [x0] // store lr as the PC in order to skip the call + // to this function + ret +ENDPROC(perf_regs_load) -- 1.7.11.7 -- 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/