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.
Acked-by: Masami Hiramatsu <[email protected]> Signed-off-by: He Kuang <[email protected]> --- tools/perf/arch/arm64/Makefile | 1 + tools/perf/arch/arm64/util/dwarf-regs.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) 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 090f36b..6d17a31 100644 --- a/tools/perf/arch/arm64/util/dwarf-regs.c +++ b/tools/perf/arch/arm64/util/dwarf-regs.c @@ -9,6 +9,8 @@ */ #include <stddef.h> +#include <errno.h> /* for EINVAL */ +#include <string.h> /* for strcmp */ #include <linux/ptrace.h> /* for struct user_pt_regs */ #include <dwarf-regs.h> @@ -75,3 +77,21 @@ const char *get_arch_regstr(unsigned int n) { return (n < ARCH_MAX_REGS) ? regoffset_table[n].name : NULL; } + +/* Reuse code from arch/arm64/kernel/ptrace.c */ +/** + * regs_query_register_offset() - query register offset from its name + * @name: the name of a register + * + * regs_query_register_offset() returns the offset of a register in struct + * user_pt_regs from its name. If the name is invalid, this returns -EINVAL; + */ +int regs_query_register_offset(const char *name) +{ + const struct pt_regs_offset *roff; + + for (roff = regoffset_table; roff->name != NULL; roff++) + if (!strcmp(roff->name, name)) + return roff->offset; + return -EINVAL; +} -- 1.8.5.2
