Messages in this thread Patch in this message | | | Date | Thu, 9 Feb 2017 23:40:17 -0800 | From | tip-bot for He Kuang <> | Subject | [tip:perf/core] perf tools arm64: Add support for generating bpf prologue |
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Commit-ID: 3bb53c9f124bd9297f18d58a395cff59dfaf8541 Gitweb: http://git.kernel.org/tip/3bb53c9f124bd9297f18d58a395cff59dfaf8541 Author: He Kuang <hekuang@huawei.com> AuthorDate: Tue, 7 Feb 2017 07:34:11 +0000 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Wed, 8 Feb 2017 08:55:01 -0300
perf tools arm64: Add support for generating bpf prologue
Since HAVE_KPROBES can be enabled in arm64, this patch introduces regs_query_register_offset() to convert register name to offset for arm64, so the BPF prologue feature is ready to use.
Signed-off-by: He Kuang <hekuang@huawei.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Bintian Wang <bintian.wang@huawei.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Wang Nan <wangnan0@huawei.com> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/20170207073412.26983-1-hekuang@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/arch/arm64/Makefile | 1 + tools/perf/arch/arm64/util/dwarf-regs.c | 15 ++++++++++++++- 2 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile index 18b1351..eebe1ec 100644 --- a/tools/perf/arch/arm64/Makefile +++ b/tools/perf/arch/arm64/Makefile @@ -2,3 +2,4 @@ ifndef NO_DWARF PERF_HAVE_DWARF_REGS := 1 endif PERF_HAVE_JITDUMP := 1 +PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1 diff --git a/tools/perf/arch/arm64/util/dwarf-regs.c b/tools/perf/arch/arm64/util/dwarf-regs.c index d49efeb..068b618 100644 --- a/tools/perf/arch/arm64/util/dwarf-regs.c +++ b/tools/perf/arch/arm64/util/dwarf-regs.c @@ -10,17 +10,20 @@ #include <stddef.h> #include <dwarf-regs.h> +#include <linux/ptrace.h> /* for struct user_pt_regs */ +#include "util.h" struct pt_regs_dwarfnum { const char *name; unsigned int dwarfnum; }; -#define STR(s) #s #define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num} #define GPR_DWARFNUM_NAME(num) \ {.name = STR(%x##num), .dwarfnum = num} #define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0} +#define DWARFNUM2OFFSET(index) \ + (index * sizeof((struct user_pt_regs *)0)->regs[0]) /* * Reference: @@ -78,3 +81,13 @@ const char *get_arch_regstr(unsigned int n) return roff->name; return NULL; } + +int regs_query_register_offset(const char *name) +{ + const struct pt_regs_dwarfnum *roff; + + for (roff = regdwarfnum_table; roff->name != NULL; roff++) + if (!strcmp(roff->name, name)) + return DWARFNUM2OFFSET(roff->dwarfnum); + return -EINVAL; +}
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