Messages in this thread | | | Subject | Re: [RFC PATCH v2 03/15] perf bpf: Save pt_regs info from debuginfo | From | He Kuang <> | Date | Mon, 25 May 2015 15:38:38 +0800 |
| |
On 2015/5/24 21:31, Masami Hiramatsu wrote: > On 2015/05/24 17:27, He Kuang wrote: >> Save reg number in function convert_variable_location() instead of the >> register string name, so we can fetch the target register from bpf >> context register later. > > This is not needed because you can also get reg number from reg string > afterwards. > > Thank you,
Ok, thanks > >> >> Signed-off-by: He Kuang <hekuang@huawei.com> >> --- >> tools/perf/util/include/dwarf-regs.h | 13 +++++++++++++ >> tools/perf/util/probe-event.h | 1 + >> tools/perf/util/probe-finder.c | 11 +++++++++++ >> 3 files changed, 25 insertions(+) >> >> diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h >> index 8f14965..566ff6d 100644 >> --- a/tools/perf/util/include/dwarf-regs.h >> +++ b/tools/perf/util/include/dwarf-regs.h >> @@ -2,7 +2,20 @@ >> #define _PERF_DWARF_REGS_H_ >> >> #ifdef HAVE_DWARF_SUPPORT >> +struct arch_regs_info { >> + const char *name; /* Architecture dependent register string */ >> + int offset; /* Reg offset in struct pt_regs */ >> + int size; /* Reg size */ >> +}; >> + >> +#define ARCH_REGS_INFO(r, pt_reg_name) \ >> + {.name = r, \ >> + .offset = offsetof(struct pt_regs, pt_reg_name), \ >> + .size = sizeof(((struct pt_regs *)0)->pt_reg_name)} \ >> + >> const char *get_arch_regstr(unsigned int n); >> +int get_arch_reg_offset(unsigned int n); >> +int get_arch_reg_size(unsigned int n); >> #endif >> >> #endif >> diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h >> index d6b7834..6c19395 100644 >> --- a/tools/perf/util/probe-event.h >> +++ b/tools/perf/util/probe-event.h >> @@ -29,6 +29,7 @@ struct probe_trace_arg { >> char *value; /* Base value */ >> char *type; /* Type name */ >> struct probe_trace_arg_ref *ref; /* Referencing offset */ >> + unsigned int regn; /* Regn from dwarf */ >> }; >> >> /* kprobe-tracer and uprobe-tracer tracing event (point + arg) */ >> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c >> index ee27b74..681af00 100644 >> --- a/tools/perf/util/probe-finder.c >> +++ b/tools/perf/util/probe-finder.c >> @@ -159,6 +159,16 @@ static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) >> return ref; >> } >> >> +int __attribute__ ((weak)) >> +get_arch_reg_offset(unsigned int n __maybe_unused) { >> + return -1; >> +} >> + >> +int __attribute__ ((weak)) >> +get_arch_reg_size(unsigned int n __maybe_unused) { >> + return -1; >> +} >> + >> /* >> * Convert a location into trace_arg. >> * If tvar == NULL, this just checks variable can be converted. >> @@ -260,6 +270,7 @@ static_var: >> return -ERANGE; >> } >> >> + tvar->regn = regn; >> tvar->value = strdup(regs); >> if (tvar->value == NULL) >> return -ENOMEM; >> > >
| |