Commit 293d5b43 authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Arnaldo Carvalho de Melo
Browse files

perf probe: Support probing on offline cross-arch binary 



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: default avatarMasami 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 428aff82

tools/perf/arch/arm/include/dwarf-regs-table.h

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#ifdef DEFINE_DWARF_REGSTR_TABLE

/* This is included in perf/util/dwarf-regs.c */



static const char * const arm_regstr_tbl[] = {

	"%r0", "%r1", "%r2", "%r3", "%r4",

	"%r5", "%r6", "%r7", "%r8", "%r9", "%r10",

	"%fp", "%ip", "%sp", "%lr", "%pc",

};

#endif

tools/perf/arch/arm64/include/dwarf-regs-table.h

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Original line number Diff line number Diff line 
#ifdef DEFINE_DWARF_REGSTR_TABLE

/* This is included in perf/util/dwarf-regs.c */



static const char * const aarch64_regstr_tbl[] = {

	"%r0", "%r1", "%r2", "%r3", "%r4",

	"%r5", "%r6", "%r7", "%r8", "%r9",

	"%r10", "%r11", "%r12", "%r13", "%r14",

	"%r15", "%r16", "%r17", "%r18", "%r19",

	"%r20", "%r21", "%r22", "%r23", "%r24",

	"%r25", "%r26", "%r27", "%r28", "%r29",

	"%lr", "%sp",

};

#endif

tools/perf/arch/powerpc/include/dwarf-regs-table.h

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#ifdef DEFINE_DWARF_REGSTR_TABLE

/* This is included in perf/util/dwarf-regs.c */



/*

 * Reference:

 * http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html

 * http://refspecs.linux-foundation.org/elf/elfspec_ppc.pdf

 */

#define REG_DWARFNUM_NAME(reg, idx)	[idx] = "%" #reg



static const char * const powerpc_regstr_tbl[] = {

	"%gpr0", "%gpr1", "%gpr2", "%gpr3", "%gpr4",

	"%gpr5", "%gpr6", "%gpr7", "%gpr8", "%gpr9",

	"%gpr10", "%gpr11", "%gpr12", "%gpr13", "%gpr14",

	"%gpr15", "%gpr16", "%gpr17", "%gpr18", "%gpr19",

	"%gpr20", "%gpr21", "%gpr22", "%gpr23", "%gpr24",

	"%gpr25", "%gpr26", "%gpr27", "%gpr28", "%gpr29",

	"%gpr30", "%gpr31",

	REG_DWARFNUM_NAME(msr,   66),

	REG_DWARFNUM_NAME(ctr,   109),

	REG_DWARFNUM_NAME(link,  108),

	REG_DWARFNUM_NAME(xer,   101),

	REG_DWARFNUM_NAME(dar,   119),

	REG_DWARFNUM_NAME(dsisr, 118),

};



#endif

tools/perf/arch/s390/include/dwarf-regs-table.h

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#ifdef DEFINE_DWARF_REGSTR_TABLE

/* This is included in perf/util/dwarf-regs.c */



static const char * const s390_regstr_tbl[] = {

	"%r0", "%r1",  "%r2",  "%r3",  "%r4",  "%r5",  "%r6",  "%r7",

	"%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15",

};

#endif

tools/perf/arch/sh/include/dwarf-regs-table.h

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#ifdef DEFINE_DWARF_REGSTR_TABLE

/* This is included in perf/util/dwarf-regs.c */



const char * const sh_regstr_tbl[] = {

	"r0",

	"r1",

	"r2",

	"r3",

	"r4",

	"r5",

	"r6",

	"r7",

	"r8",

	"r9",

	"r10",

	"r11",

	"r12",

	"r13",

	"r14",

	"r15",

	"pc",

	"pr",

};



#endif

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