forked from Minki/linux
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>
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*
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* dwarf-regs.c : Mapping of DWARF debug register numbers into register names.
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*
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* Written by: Masami Hiramatsu <mhiramat@kernel.org>
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*/
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#include <util.h>
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#include <debug.h>
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#include <dwarf-regs.h>
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#include <elf.h>
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#ifndef EM_AARCH64
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#define EM_AARCH64 183 /* ARM 64 bit */
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#endif
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/* Define const char * {arch}_register_tbl[] */
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#define DEFINE_DWARF_REGSTR_TABLE
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#include "../arch/x86/include/dwarf-regs-table.h"
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#include "../arch/arm/include/dwarf-regs-table.h"
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#include "../arch/arm64/include/dwarf-regs-table.h"
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#include "../arch/sh/include/dwarf-regs-table.h"
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#include "../arch/powerpc/include/dwarf-regs-table.h"
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#include "../arch/s390/include/dwarf-regs-table.h"
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#include "../arch/sparc/include/dwarf-regs-table.h"
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#include "../arch/xtensa/include/dwarf-regs-table.h"
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#define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
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/* Return architecture dependent register string (for kprobe-tracer) */
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const char *get_dwarf_regstr(unsigned int n, unsigned int machine)
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{
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switch (machine) {
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case EM_NONE: /* Generic arch - use host arch */
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return get_arch_regstr(n);
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case EM_386:
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return __get_dwarf_regstr(x86_32_regstr_tbl, n);
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case EM_X86_64:
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return __get_dwarf_regstr(x86_64_regstr_tbl, n);
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case EM_ARM:
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return __get_dwarf_regstr(arm_regstr_tbl, n);
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case EM_AARCH64:
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return __get_dwarf_regstr(aarch64_regstr_tbl, n);
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case EM_SH:
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return __get_dwarf_regstr(sh_regstr_tbl, n);
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case EM_S390:
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return __get_dwarf_regstr(s390_regstr_tbl, n);
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case EM_PPC:
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case EM_PPC64:
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return __get_dwarf_regstr(powerpc_regstr_tbl, n);
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case EM_SPARC:
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case EM_SPARCV9:
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return __get_dwarf_regstr(sparc_regstr_tbl, n);
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case EM_XTENSA:
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return __get_dwarf_regstr(xtensa_regstr_tbl, n);
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default:
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pr_err("ELF MACHINE %x is not supported.\n", machine);
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}
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return NULL;
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}
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