Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759269AbcDAOHM (ORCPT ); Fri, 1 Apr 2016 10:07:12 -0400 Received: from mail.kernel.org ([198.145.29.136]:58423 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759116AbcDAOGh (ORCPT ); Fri, 1 Apr 2016 10:06:37 -0400 Date: Fri, 1 Apr 2016 11:06:28 -0300 From: Arnaldo Carvalho de Melo To: Ralf Baechle Cc: Peter Zijlstra , Ingo Molnar , Alexander Shishkin , David Daney , Thomas Gleixner , Paul Burton , James Hogan , Matt Redfearn , Qais Yousef , Ben Hutchings , Jiri Olsa , Wang Nan , Adrian Hunter , Namhyung Kim , Stephane Eranian , linux-mips@linux-mips.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 2/3] perf tools: Add support for MIPS userspace DWARF callchains. Message-ID: <20160401140628.GE7115@kernel.org> References: <13b2723b59281cacda362f261ba57b643f21a0d1.1459501014.git.ralf@linux-mips.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <13b2723b59281cacda362f261ba57b643f21a0d1.1459501014.git.ralf@linux-mips.org> X-Url: http://acmel.wordpress.com User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 20593 Lines: 525 Em Fri, Apr 01, 2016 at 10:56:56AM +0200, Ralf Baechle escreveu: > From: David Daney > > Hack up the Makefile and add support code for mips unwinding > and dwarf-regs. Bzzt, failing to build on a minimal mips64 debian experimental env, on the one hand you expect perf/arch/mips/util/dwarf-regs.o to be built but something, probably some missing devel package, is not triggering its build: # docker run -v /home/acme/git:/git --privileged=true --rm=true -t -i perf-build-minimal-debian-experimental-x-mips64 make: Entering directory '/git/linux/tools/perf' BUILD: Doing 'make -j4' parallel build sh: 1: command: Illegal option -c Auto-detecting system features: ... dwarf: [ OFF ] ... glibc: [ on ] ... gtk2: [ OFF ] ... libaudit: [ OFF ] ... libbfd: [ OFF ] ... libelf: [ OFF ] ... libnuma: [ OFF ] ... numa_num_possible_cpus: [ OFF ] ... libperl: [ OFF ] ... libpython: [ OFF ] ... libslang: [ OFF ] ... libcrypto: [ OFF ] ... libunwind: [ OFF ] ... libdw-dwarf-unwind: [ OFF ] ... zlib: [ OFF ] ... lzma: [ OFF ] ... get_cpuid: [ OFF ] ... bpf: [ on ] config/Makefile:246: No libelf found, disables 'probe' tool and BPF support in 'perf record', please install elfutils-libelf-devel/libelf-dev config/Makefile:364: Disabling post unwind, no support found. config/Makefile:405: No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev config/Makefile:416: No libcrypto.h found, disables jitted code injection, please install libssl-devel or libssl-dev config/Makefile:431: slang not found, disables TUI support. Please install slang-devel or libslang-dev config/Makefile:445: GTK2 not found, disables GTK2 support. Please install gtk2-devel or libgtk2.0-dev config/Makefile:473: Missing perl devel files. Disabling perl scripting support, please install perl-ExtUtils-Embed/libperl-dev config/Makefile:499: No python interpreter was found: disables Python support - please install python-devel/python-dev config/Makefile:606: No liblzma found, disables xz kernel module decompression, please install xz-devel/liblzma-dev config/Makefile:619: No numa.h found, disables 'perf bench numa mem' benchmark, please install numactl-devel/libnuma-devel/libnuma-dev config/Makefile:676: Your gcc lacks the __get_cpuid() builtin, disables support for auxtrace/Intel PT, please install a newer gcc MKDIR /tmp/build/perf/util/ CC /tmp/build/perf/util/alias.o MKDIR /tmp/build/perf/fd/ CC /tmp/build/perf/exec-cmd.o CC /tmp/build/perf/event-parse.o CC /tmp/build/perf/fd/array.o LD /tmp/build/perf/fd/libapi-in.o MKDIR /tmp/build/perf/fs/ CC /tmp/build/perf/fs/fs.o MKDIR /tmp/build/perf/util/ CC /tmp/build/perf/util/annotate.o CC /tmp/build/perf/help.o MKDIR /tmp/build/perf/fs/ CC /tmp/build/perf/fs/tracing_path.o CC /tmp/build/perf/pager.o LD /tmp/build/perf/fs/libapi-in.o CC /tmp/build/perf/cpu.o CC /tmp/build/perf/event-plugin.o CC /tmp/build/perf/parse-options.o CC /tmp/build/perf/debug.o LD /tmp/build/perf/libapi-in.o AR /tmp/build/perf/libapi.a CC /tmp/build/perf/trace-seq.o CC /tmp/build/perf/parse-filter.o CC /tmp/build/perf/parse-utils.o CC /tmp/build/perf/kbuffer-parse.o LD /tmp/build/perf/libtraceevent-in.o LINK /tmp/build/perf/libtraceevent.a GEN /tmp/build/perf/common-cmds.h CC /tmp/build/perf/plugin_jbd2.o LD /tmp/build/perf/plugin_jbd2-in.o CC /tmp/build/perf/plugin_hrtimer.o PERF_VERSION = 4.5.0 CC /tmp/build/perf/builtin-bench.o LD /tmp/build/perf/plugin_hrtimer-in.o CC /tmp/build/perf/plugin_kmem.o CC /tmp/build/perf/run-command.o LD /tmp/build/perf/plugin_kmem-in.o CC /tmp/build/perf/plugin_kvm.o LD /tmp/build/perf/plugin_kvm-in.o CC /tmp/build/perf/plugin_mac80211.o LD /tmp/build/perf/plugin_mac80211-in.o CC /tmp/build/perf/plugin_sched_switch.o CC /tmp/build/perf/builtin-annotate.o CC /tmp/build/perf/sigchain.o LD /tmp/build/perf/plugin_sched_switch-in.o CC /tmp/build/perf/util/build-id.o CC /tmp/build/perf/plugin_function.o LD /tmp/build/perf/plugin_function-in.o CC /tmp/build/perf/plugin_xen.o CC /tmp/build/perf/subcmd-config.o LD /tmp/build/perf/plugin_xen-in.o CC /tmp/build/perf/plugin_scsi.o LD /tmp/build/perf/libsubcmd-in.o AR /tmp/build/perf/libsubcmd.a GEN perf-archive GEN perf-with-kcore CC /tmp/build/perf/plugin_cfg80211.o LD /tmp/build/perf/plugin_scsi-in.o MKDIR /tmp/build/perf/arch/ CC /tmp/build/perf/arch/common.o LD /tmp/build/perf/plugin_cfg80211-in.o LINK /tmp/build/perf/plugin_jbd2.so LINK /tmp/build/perf/plugin_hrtimer.so LINK /tmp/build/perf/plugin_kmem.so LINK /tmp/build/perf/plugin_kvm.so CC /tmp/build/perf/builtin-config.o LINK /tmp/build/perf/plugin_mac80211.so LINK /tmp/build/perf/plugin_sched_switch.so LINK /tmp/build/perf/plugin_function.so LINK /tmp/build/perf/plugin_xen.so LINK /tmp/build/perf/plugin_scsi.so CC /tmp/build/perf/builtin-diff.o LINK /tmp/build/perf/plugin_cfg80211.so MKDIR /tmp/build/perf/arch/mips/util/ LD /tmp/build/perf/arch/mips/util/libperf-in.o LD /tmp/build/perf/arch/mips/libperf-in.o CC /tmp/build/perf/util/config.o LD /tmp/build/perf/arch/libperf-in.o CC /tmp/build/perf/builtin-evlist.o GEN /tmp/build/perf/libtraceevent-dynamic-list CC /tmp/build/perf/builtin-help.o CC /tmp/build/perf/builtin-sched.o MKDIR /tmp/build/perf/ui/ CC /tmp/build/perf/ui/setup.o CC /tmp/build/perf/util/ctype.o CC /tmp/build/perf/util/db-export.o MKDIR /tmp/build/perf/ui/ CC /tmp/build/perf/ui/helpline.o CC /tmp/build/perf/builtin-buildid-list.o CC /tmp/build/perf/ui/progress.o CC /tmp/build/perf/ui/util.o CC /tmp/build/perf/util/env.o CC /tmp/build/perf/builtin-buildid-cache.o CC /tmp/build/perf/ui/hist.o CC /tmp/build/perf/util/event.o CC /tmp/build/perf/util/evlist.o CC /tmp/build/perf/builtin-list.o CC /tmp/build/perf/builtin-record.o CC /tmp/build/perf/util/evsel.o CC /tmp/build/perf/builtin-report.o CC /tmp/build/perf/util/find_bit.o CC /tmp/build/perf/util/kallsyms.o CC /tmp/build/perf/util/levenshtein.o CC /tmp/build/perf/util/llvm-utils.o MKDIR /tmp/build/perf/ui/stdio/ CC /tmp/build/perf/ui/stdio/hist.o CC /tmp/build/perf/builtin-stat.o BISON /tmp/build/perf/util/parse-events-bison.c CC /tmp/build/perf/util/perf_regs.o CC /tmp/build/perf/util/path.o CC /tmp/build/perf/util/rbtree.o LD /tmp/build/perf/ui/libperf-in.o MKDIR /tmp/build/perf/scripts/ LD /tmp/build/perf/scripts/libperf-in.o CC /tmp/build/perf/builtin-timechart.o CC /tmp/build/perf/util/libstring.o CC /tmp/build/perf/util/bitmap.o CC /tmp/build/perf/util/hweight.o CC /tmp/build/perf/util/quote.o CC /tmp/build/perf/util/strbuf.o CC /tmp/build/perf/util/string.o CC /tmp/build/perf/util/strlist.o CC /tmp/build/perf/util/strfilter.o CC /tmp/build/perf/util/top.o CC /tmp/build/perf/builtin-top.o CC /tmp/build/perf/util/usage.o CC /tmp/build/perf/builtin-script.o CC /tmp/build/perf/util/wrapper.o CC /tmp/build/perf/util/dso.o CC /tmp/build/perf/util/symbol.o CC /tmp/build/perf/util/color.o CC /tmp/build/perf/builtin-kmem.o CC /tmp/build/perf/util/header.o CC /tmp/build/perf/util/callchain.o CC /tmp/build/perf/builtin-lock.o CC /tmp/build/perf/builtin-kvm.o CC /tmp/build/perf/builtin-inject.o CC /tmp/build/perf/builtin-mem.o CC /tmp/build/perf/builtin-data.o CC /tmp/build/perf/builtin-version.o MKDIR /tmp/build/perf/bench/ CC /tmp/build/perf/bench/sched-messaging.o MKDIR /tmp/build/perf/tests/ CC /tmp/build/perf/tests/builtin-test.o CC /tmp/build/perf/perf.o CC /tmp/build/perf/util/values.o MKDIR /tmp/build/perf/bench/ CC /tmp/build/perf/bench/sched-pipe.o MKDIR /tmp/build/perf/tests/ CC /tmp/build/perf/tests/parse-events.o CC /tmp/build/perf/util/debug.o CC /tmp/build/perf/bench/mem-functions.o CC /tmp/build/perf/bench/futex-hash.o CC /tmp/build/perf/util/machine.o CC /tmp/build/perf/bench/futex-wake.o CC /tmp/build/perf/bench/futex-wake-parallel.o CC /tmp/build/perf/bench/futex-requeue.o CC /tmp/build/perf/bench/futex-lock-pi.o CC /tmp/build/perf/util/map.o LD /tmp/build/perf/bench/perf-in.o CC /tmp/build/perf/util/pstack.o CC /tmp/build/perf/util/session.o CC /tmp/build/perf/tests/dso-data.o CC /tmp/build/perf/util/ordered-events.o CC /tmp/build/perf/util/comm.o CC /tmp/build/perf/util/thread.o CC /tmp/build/perf/tests/attr.o CC /tmp/build/perf/util/thread_map.o CC /tmp/build/perf/util/trace-event-parse.o CC /tmp/build/perf/tests/vmlinux-kallsyms.o CC /tmp/build/perf/tests/openat-syscall.o CC /tmp/build/perf/util/parse-events-bison.o BISON /tmp/build/perf/util/pmu-bison.c CC /tmp/build/perf/util/trace-event-read.o CC /tmp/build/perf/tests/openat-syscall-all-cpus.o CC /tmp/build/perf/tests/openat-syscall-tp-fields.o CC /tmp/build/perf/tests/mmap-basic.o CC /tmp/build/perf/util/trace-event-info.o CC /tmp/build/perf/tests/perf-record.o CC /tmp/build/perf/tests/evsel-roundtrip-name.o CC /tmp/build/perf/util/trace-event-scripting.o CC /tmp/build/perf/util/trace-event.o CC /tmp/build/perf/tests/evsel-tp-sched.o CC /tmp/build/perf/tests/fdarray.o CC /tmp/build/perf/util/svghelper.o CC /tmp/build/perf/util/sort.o CC /tmp/build/perf/tests/pmu.o CC /tmp/build/perf/tests/hists_common.o CC /tmp/build/perf/tests/hists_link.o CC /tmp/build/perf/tests/hists_filter.o CC /tmp/build/perf/tests/hists_output.o CC /tmp/build/perf/util/hist.o CC /tmp/build/perf/tests/hists_cumulate.o CC /tmp/build/perf/tests/python-use.o CC /tmp/build/perf/tests/bp_signal.o CC /tmp/build/perf/tests/bp_signal_overflow.o CC /tmp/build/perf/tests/task-exit.o CC /tmp/build/perf/tests/sw-clock.o CC /tmp/build/perf/util/util.o CC /tmp/build/perf/tests/mmap-thread-lookup.o CC /tmp/build/perf/tests/thread-mg-share.o CC /tmp/build/perf/tests/switch-tracking.o CC /tmp/build/perf/tests/keep-tracking.o CC /tmp/build/perf/util/xyarray.o CC /tmp/build/perf/util/cpumap.o CC /tmp/build/perf/tests/code-reading.o CC /tmp/build/perf/util/cgroup.o CC /tmp/build/perf/tests/sample-parsing.o CC /tmp/build/perf/util/target.o CC /tmp/build/perf/util/rblist.o CC /tmp/build/perf/util/intlist.o CC /tmp/build/perf/tests/parse-no-sample-id-all.o CC /tmp/build/perf/tests/kmod-path.o CC /tmp/build/perf/util/vdso.o CC /tmp/build/perf/util/counts.o CC /tmp/build/perf/tests/thread-map.o CC /tmp/build/perf/util/stat.o CC /tmp/build/perf/util/stat-shadow.o CC /tmp/build/perf/tests/llvm.o CC /tmp/build/perf/tests/bpf.o CC /tmp/build/perf/tests/topology.o CC /tmp/build/perf/util/record.o CC /tmp/build/perf/tests/cpumap.o CC /tmp/build/perf/util/srcline.o CC /tmp/build/perf/tests/stat.o CC /tmp/build/perf/tests/event_update.o CC /tmp/build/perf/tests/event-times.o CC /tmp/build/perf/util/data.o CC /tmp/build/perf/util/tsc.o CC /tmp/build/perf/util/cloexec.o CC /tmp/build/perf/util/thread-stack.o CC /tmp/build/perf/util/parse-branch-options.o CC /tmp/build/perf/util/parse-regs-options.o CC /tmp/build/perf/tests/llvm-src-base.o CC /tmp/build/perf/tests/llvm-src-kbuild.o CC /tmp/build/perf/tests/llvm-src-prologue.o CC /tmp/build/perf/util/term.o CC /tmp/build/perf/tests/llvm-src-relocation.o LD /tmp/build/perf/tests/perf-in.o CC /tmp/build/perf/util/help-unknown-cmd.o CC /tmp/build/perf/util/mem-events.o LD /tmp/build/perf/perf-in.o CC /tmp/build/perf/util/symbol-minimal.o MKDIR /tmp/build/perf/util/scripting-engines/ LD /tmp/build/perf/util/scripting-engines/libperf-in.o CC /tmp/build/perf/util/demangle-java.o FLEX /tmp/build/perf/util/parse-events-flex.c FLEX /tmp/build/perf/util/pmu-flex.c CC /tmp/build/perf/util/pmu-bison.o CC /tmp/build/perf/util/parse-events.o CC /tmp/build/perf/util/parse-events-flex.o CC /tmp/build/perf/util/pmu.o CC /tmp/build/perf/util/pmu-flex.o LD /tmp/build/perf/util/libperf-in.o LD /tmp/build/perf/libperf-in.o AR /tmp/build/perf/libperf.a mips64-linux-gnuabi64-ar: /tmp/build/perf/arch/mips/util/dwarf-regs.o: No such file or directory Makefile.perf:437: recipe for target '/tmp/build/perf/libperf.a' failed make[1]: *** [/tmp/build/perf/libperf.a] Error 1 Makefile:108: recipe for target 'install-bin' failed make: *** [install-bin] Error 2 make: Leaving directory '/git/linux/tools/perf' [root@jouet ~]# > Signed-off-by: David Daney > Cc: linux-mips@linux-mips.org > Cc: Jiri Olsa > Cc: linux-kernel@vger.kernel.org > Cc: Peter Zijlstra > Cc: Paul Mackerras > Cc: Ingo Molnar > Cc: Arnaldo Carvalho de Melo > Signed-off-by: Ralf Baechle > --- > tools/perf/arch/mips/Build | 2 +- > tools/perf/arch/mips/Makefile | 7 +++ > tools/perf/arch/mips/include/perf_regs.h | 84 ++++++++++++++++++++++++++++ > tools/perf/arch/mips/util/Build | 2 + > tools/perf/arch/mips/util/dwarf-regs.c | 37 ++++++++++++ > tools/perf/arch/mips/util/unwind-libunwind.c | 20 +++++++ > 6 files changed, 151 insertions(+), 1 deletion(-) > create mode 100644 tools/perf/arch/mips/Makefile > create mode 100644 tools/perf/arch/mips/include/perf_regs.h > create mode 100644 tools/perf/arch/mips/util/Build > create mode 100644 tools/perf/arch/mips/util/dwarf-regs.c > create mode 100644 tools/perf/arch/mips/util/unwind-libunwind.c > > diff --git a/tools/perf/arch/mips/Build b/tools/perf/arch/mips/Build > index 1bb8bf6..54afe4a 100644 > --- a/tools/perf/arch/mips/Build > +++ b/tools/perf/arch/mips/Build > @@ -1 +1 @@ > -# empty > +libperf-y += util/ > diff --git a/tools/perf/arch/mips/Makefile b/tools/perf/arch/mips/Makefile > new file mode 100644 > index 0000000..fe9b61e > --- /dev/null > +++ b/tools/perf/arch/mips/Makefile > @@ -0,0 +1,7 @@ > +ifndef NO_DWARF > +PERF_HAVE_DWARF_REGS := 1 > +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o > +endif > +ifndef NO_LIBUNWIND > +LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind.o > +endif > diff --git a/tools/perf/arch/mips/include/perf_regs.h b/tools/perf/arch/mips/include/perf_regs.h > new file mode 100644 > index 0000000..a91b904 > --- /dev/null > +++ b/tools/perf/arch/mips/include/perf_regs.h > @@ -0,0 +1,84 @@ > +#ifndef ARCH_PERF_REGS_H > +#define ARCH_PERF_REGS_H > + > +#include > +#include "../../util/types.h" > +#include > + > +#define PERF_REG_IP PERF_REG_MIPS_PC > +#define PERF_REG_SP PERF_REG_MIPS_R29 > + > +#define PERF_REGS_MASK ((1ULL << PERF_REG_MIPS_MAX) - 1) > + > +static inline const char *perf_reg_name(int id) > +{ > + switch (id) { > + case PERF_REG_MIPS_PC: > + return "PC"; > + case PERF_REG_MIPS_R1: > + return "$1"; > + case PERF_REG_MIPS_R2: > + return "$2"; > + case PERF_REG_MIPS_R3: > + return "$3"; > + case PERF_REG_MIPS_R4: > + return "$4"; > + case PERF_REG_MIPS_R5: > + return "$5"; > + case PERF_REG_MIPS_R6: > + return "$6"; > + case PERF_REG_MIPS_R7: > + return "$7"; > + case PERF_REG_MIPS_R8: > + return "$8"; > + case PERF_REG_MIPS_R9: > + return "$9"; > + case PERF_REG_MIPS_R10: > + return "$10"; > + case PERF_REG_MIPS_R11: > + return "$11"; > + case PERF_REG_MIPS_R12: > + return "$12"; > + case PERF_REG_MIPS_R13: > + return "$13"; > + case PERF_REG_MIPS_R14: > + return "$14"; > + case PERF_REG_MIPS_R15: > + return "$15"; > + case PERF_REG_MIPS_R16: > + return "$16"; > + case PERF_REG_MIPS_R17: > + return "$17"; > + case PERF_REG_MIPS_R18: > + return "$18"; > + case PERF_REG_MIPS_R19: > + return "$19"; > + case PERF_REG_MIPS_R20: > + return "$20"; > + case PERF_REG_MIPS_R21: > + return "$21"; > + case PERF_REG_MIPS_R22: > + return "$22"; > + case PERF_REG_MIPS_R23: > + return "$23"; > + case PERF_REG_MIPS_R24: > + return "$24"; > + case PERF_REG_MIPS_R25: > + return "$25"; > + > + case PERF_REG_MIPS_R28: > + return "$28"; > + case PERF_REG_MIPS_R29: > + return "$29"; > + case PERF_REG_MIPS_R30: > + return "$30"; > + case PERF_REG_MIPS_R31: > + return "$31"; > + default: > + break; > + } > + return NULL; > +} > + > + > +#endif /* ARCH_PERF_REGS_H */ > diff --git a/tools/perf/arch/mips/util/Build b/tools/perf/arch/mips/util/Build > new file mode 100644 > index 0000000..baeccb0 > --- /dev/null > +++ b/tools/perf/arch/mips/util/Build > @@ -0,0 +1,2 @@ > +libperf-$(CONFIG_DWARF) += dwarf-regs.o > +libperf-$(CONFIG_LIBUNWIND) += unwind-libunwind.o > diff --git a/tools/perf/arch/mips/util/dwarf-regs.c b/tools/perf/arch/mips/util/dwarf-regs.c > new file mode 100644 > index 0000000..165e017 > --- /dev/null > +++ b/tools/perf/arch/mips/util/dwarf-regs.c > @@ -0,0 +1,37 @@ > +/* > + * dwarf-regs.c : Mapping of DWARF debug register numbers into register names. > + * > + * Copyright (C) 2013 Cavium, Inc. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#include > +#include > + > +static const char *mips_gpr_names[32] = { > + "$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", "$9", > + "$10", "$11", "$12", "$13", "$14", "$15", "$16", "$17", "$18", "$19", > + "$20", "$21", "$22", "$23", "$24", "$25", "$26", "$27", "$28", "$29", > + "$30", "$31" > +}; > + > +const char *get_arch_regstr(unsigned int n) > +{ > + if (n < 32) > + return mips_gpr_names[n]; > + if (n == 64) > + return "hi"; > + if (n == 65) > + return "lo"; > + return NULL; > +} > diff --git a/tools/perf/arch/mips/util/unwind-libunwind.c b/tools/perf/arch/mips/util/unwind-libunwind.c > new file mode 100644 > index 0000000..612949b > --- /dev/null > +++ b/tools/perf/arch/mips/util/unwind-libunwind.c > @@ -0,0 +1,20 @@ > + > +#include > +#include > +#include "perf_regs.h" > +#include "../../util/unwind.h" > + > +int unwind__arch_reg_id(int regnum) > +{ > + switch (regnum) { > + case UNW_MIPS_R1 ... UNW_MIPS_R25: > + return regnum - UNW_MIPS_R1 + PERF_REG_MIPS_R1; > + case UNW_MIPS_R28 ... UNW_MIPS_R31: > + return regnum - UNW_MIPS_R28 + PERF_REG_MIPS_R28; > + case UNW_MIPS_PC: > + return PERF_REG_MIPS_PC; > + default: > + pr_err("unwind: invalid reg id %d\n", regnum); > + return -EINVAL; > + } > +} > -- > 2.5.5 >