Commit fead7960 authored by Ian Munsie's avatar Ian Munsie Committed by Paul Mackerras
Browse files

perf probe: Add PowerPC DWARF register number mappings 



This adds mappings from the register numbers from DWARF to the
register names used in the PowerPC Regs and Stack Access API.  This
allows perf probe to be used to record variable contents on PowerPC.

This requires the functionality represented by the config symbol
HAVE_REGS_AND_STACK_ACCESS_API in order to function, although it will
compile without it.  That functionality is added for PowerPC in commit
359e4284 ("powerpc: Add kprobe-based event tracer").

Signed-off-by: default avatarIan Munsie <imunsie@au.ibm.com>
Acked-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent cd932c59

tools/perf/arch/powerpc/Makefile

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+4 −0
Original line number Diff line number Diff line 
ifndef NO_DWARF

PERF_HAVE_DWARF_REGS := 1

LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o

endif

tools/perf/arch/powerpc/util/dwarf-regs.c

0 → 100644
+88 −0
Original line number Diff line number Diff line 
/*

 * Mapping of DWARF debug register numbers into register names.

 *

 * Copyright (C) 2010 Ian Munsie, IBM Corporation.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */



#include <libio.h>

#include <dwarf-regs.h>





struct pt_regs_dwarfnum {

	const char *name;

	unsigned int dwarfnum;

};



#define STR(s) #s

#define REG_DWARFNUM_NAME(r, num) {.name = r, .dwarfnum = num}

#define GPR_DWARFNUM_NAME(num)	\

	{.name = STR(%gpr##num), .dwarfnum = num}

#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}



/*

 * Reference:

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

 */

static const struct pt_regs_dwarfnum regdwarfnum_table[] = {

	GPR_DWARFNUM_NAME(0),

	GPR_DWARFNUM_NAME(1),

	GPR_DWARFNUM_NAME(2),

	GPR_DWARFNUM_NAME(3),

	GPR_DWARFNUM_NAME(4),

	GPR_DWARFNUM_NAME(5),

	GPR_DWARFNUM_NAME(6),

	GPR_DWARFNUM_NAME(7),

	GPR_DWARFNUM_NAME(8),

	GPR_DWARFNUM_NAME(9),

	GPR_DWARFNUM_NAME(10),

	GPR_DWARFNUM_NAME(11),

	GPR_DWARFNUM_NAME(12),

	GPR_DWARFNUM_NAME(13),

	GPR_DWARFNUM_NAME(14),

	GPR_DWARFNUM_NAME(15),

	GPR_DWARFNUM_NAME(16),

	GPR_DWARFNUM_NAME(17),

	GPR_DWARFNUM_NAME(18),

	GPR_DWARFNUM_NAME(19),

	GPR_DWARFNUM_NAME(20),

	GPR_DWARFNUM_NAME(21),

	GPR_DWARFNUM_NAME(22),

	GPR_DWARFNUM_NAME(23),

	GPR_DWARFNUM_NAME(24),

	GPR_DWARFNUM_NAME(25),

	GPR_DWARFNUM_NAME(26),

	GPR_DWARFNUM_NAME(27),

	GPR_DWARFNUM_NAME(28),

	GPR_DWARFNUM_NAME(29),

	GPR_DWARFNUM_NAME(30),

	GPR_DWARFNUM_NAME(31),

	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),

	REG_DWARFNUM_END,

};



/**

 * get_arch_regstr() - lookup register name from it's DWARF register number

 * @n:	the DWARF register number

 *

 * get_arch_regstr() returns the name of the register in struct

 * regdwarfnum_table from it's DWARF register number. If the register is not

 * found in the table, this returns NULL;

 */

const char *get_arch_regstr(unsigned int n)

{

	const struct pt_regs_dwarfnum *roff;

	for (roff = regdwarfnum_table; roff->name != NULL; roff++)

		if (roff->dwarfnum == n)

			return roff->name;

	return NULL;

}

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