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https://github.com/edk2-porting/linux-next.git
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293d5b4394
Support probing on offline cross-architecture binary by adding getting the target machine arch from ELF and choose correct register string for the machine. Here is an example: ----- $ perf probe --vmlinux=./vmlinux-arm --definition 'do_sys_open $params' p:probe/do_sys_open do_sys_open+0 dfd=%r5:s32 filename=%r1:u32 flags=%r6:s32 mode=%r3:u16 ----- Here, we can get probe/do_sys_open from above and append it to to the target machine's tracing/kprobe_events file in the tracefs mountput, usually /sys/kernel/debug/tracing/kprobe_events (or /sys/kernel/tracing/kprobe_events). Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/147214229717.23638.6440579792548044658.stgit@devbox [ Add definition for EM_AARCH64 to fix the build on at least centos 6, debian 7 & ubuntu 12.04.5 ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
119 lines
3.2 KiB
C
119 lines
3.2 KiB
C
#ifndef _PROBE_FINDER_H
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#define _PROBE_FINDER_H
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#include <stdbool.h>
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#include "util.h"
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#include "intlist.h"
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#include "probe-event.h"
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#define MAX_PROBE_BUFFER 1024
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#define MAX_PROBES 128
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#define MAX_PROBE_ARGS 128
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#define PROBE_ARG_VARS "$vars"
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#define PROBE_ARG_PARAMS "$params"
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static inline int is_c_varname(const char *name)
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{
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/* TODO */
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return isalpha(name[0]) || name[0] == '_';
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}
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#ifdef HAVE_DWARF_SUPPORT
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#include "dwarf-aux.h"
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/* TODO: export debuginfo data structure even if no dwarf support */
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/* debug information structure */
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struct debuginfo {
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Dwarf *dbg;
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Dwfl_Module *mod;
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Dwfl *dwfl;
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Dwarf_Addr bias;
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};
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/* This also tries to open distro debuginfo */
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struct debuginfo *debuginfo__new(const char *path);
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void debuginfo__delete(struct debuginfo *dbg);
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/* Find probe_trace_events specified by perf_probe_event from debuginfo */
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int debuginfo__find_trace_events(struct debuginfo *dbg,
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struct perf_probe_event *pev,
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struct probe_trace_event **tevs);
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/* Find a perf_probe_point from debuginfo */
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int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr,
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struct perf_probe_point *ppt);
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/* Find a line range */
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int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr);
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/* Find available variables */
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int debuginfo__find_available_vars_at(struct debuginfo *dbg,
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struct perf_probe_event *pev,
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struct variable_list **vls);
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/* Find a src file from a DWARF tag path */
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int get_real_path(const char *raw_path, const char *comp_dir,
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char **new_path);
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struct probe_finder {
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struct perf_probe_event *pev; /* Target probe event */
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/* Callback when a probe point is found */
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int (*callback)(Dwarf_Die *sc_die, struct probe_finder *pf);
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/* For function searching */
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int lno; /* Line number */
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Dwarf_Addr addr; /* Address */
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const char *fname; /* Real file name */
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Dwarf_Die cu_die; /* Current CU */
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Dwarf_Die sp_die;
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struct intlist *lcache; /* Line cache for lazy match */
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/* For variable searching */
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#if _ELFUTILS_PREREQ(0, 142)
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/* Call Frame Information from .eh_frame */
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Dwarf_CFI *cfi_eh;
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/* Call Frame Information from .debug_frame */
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Dwarf_CFI *cfi_dbg;
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#endif
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Dwarf_Op *fb_ops; /* Frame base attribute */
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unsigned int machine; /* Target machine arch */
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struct perf_probe_arg *pvar; /* Current target variable */
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struct probe_trace_arg *tvar; /* Current result variable */
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};
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struct trace_event_finder {
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struct probe_finder pf;
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Dwfl_Module *mod; /* For solving symbols */
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struct probe_trace_event *tevs; /* Found trace events */
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int ntevs; /* Number of trace events */
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int max_tevs; /* Max number of trace events */
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};
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struct available_var_finder {
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struct probe_finder pf;
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Dwfl_Module *mod; /* For solving symbols */
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struct variable_list *vls; /* Found variable lists */
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int nvls; /* Number of variable lists */
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int max_vls; /* Max no. of variable lists */
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bool child; /* Search child scopes */
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};
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struct line_finder {
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struct line_range *lr; /* Target line range */
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const char *fname; /* File name */
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int lno_s; /* Start line number */
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int lno_e; /* End line number */
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Dwarf_Die cu_die; /* Current CU */
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Dwarf_Die sp_die;
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int found;
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};
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#endif /* HAVE_DWARF_SUPPORT */
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#endif /*_PROBE_FINDER_H */
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