perf tools ARM64: Wire up perf_regs and unwind support

This patch hooks in the perf_regs and libunwind code for ARM64.
The tools/perf/arch/arm64 is created; it contains the arch specific
code for DWARF unwinding.

Signed-off-by: Jean Pihet <jean.pihet@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1398688353-3737-1-git-send-email-jean.pihet@linaro.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
This commit is contained in:
Jean Pihet 2014-04-28 14:32:33 +02:00 committed by Jiri Olsa
parent 88080ce7f6
commit 8ab596afb9
5 changed files with 264 additions and 1 deletions

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@ -0,0 +1,7 @@
ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif
ifndef NO_LIBUNWIND
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o
endif

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@ -0,0 +1,88 @@
#ifndef ARCH_PERF_REGS_H
#define ARCH_PERF_REGS_H
#include <stdlib.h>
#include "../../util/types.h"
#include <asm/perf_regs.h>
#define PERF_REGS_MASK ((1ULL << PERF_REG_ARM64_MAX) - 1)
#define PERF_REG_IP PERF_REG_ARM64_PC
#define PERF_REG_SP PERF_REG_ARM64_SP
static inline const char *perf_reg_name(int id)
{
switch (id) {
case PERF_REG_ARM64_X0:
return "x0";
case PERF_REG_ARM64_X1:
return "x1";
case PERF_REG_ARM64_X2:
return "x2";
case PERF_REG_ARM64_X3:
return "x3";
case PERF_REG_ARM64_X4:
return "x4";
case PERF_REG_ARM64_X5:
return "x5";
case PERF_REG_ARM64_X6:
return "x6";
case PERF_REG_ARM64_X7:
return "x7";
case PERF_REG_ARM64_X8:
return "x8";
case PERF_REG_ARM64_X9:
return "x9";
case PERF_REG_ARM64_X10:
return "x10";
case PERF_REG_ARM64_X11:
return "x11";
case PERF_REG_ARM64_X12:
return "x12";
case PERF_REG_ARM64_X13:
return "x13";
case PERF_REG_ARM64_X14:
return "x14";
case PERF_REG_ARM64_X15:
return "x15";
case PERF_REG_ARM64_X16:
return "x16";
case PERF_REG_ARM64_X17:
return "x17";
case PERF_REG_ARM64_X18:
return "x18";
case PERF_REG_ARM64_X19:
return "x19";
case PERF_REG_ARM64_X20:
return "x20";
case PERF_REG_ARM64_X21:
return "x21";
case PERF_REG_ARM64_X22:
return "x22";
case PERF_REG_ARM64_X23:
return "x23";
case PERF_REG_ARM64_X24:
return "x24";
case PERF_REG_ARM64_X25:
return "x25";
case PERF_REG_ARM64_X26:
return "x26";
case PERF_REG_ARM64_X27:
return "x27";
case PERF_REG_ARM64_X28:
return "x28";
case PERF_REG_ARM64_X29:
return "x29";
case PERF_REG_ARM64_SP:
return "sp";
case PERF_REG_ARM64_LR:
return "lr";
case PERF_REG_ARM64_PC:
return "pc";
default:
return NULL;
}
return NULL;
}
#endif /* ARCH_PERF_REGS_H */

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@ -0,0 +1,80 @@
/*
* Mapping of DWARF debug register numbers into register names.
*
* Copyright (C) 2010 Will Deacon, ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <stddef.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(%x##num), .dwarfnum = num}
#define REG_DWARFNUM_END {.name = NULL, .dwarfnum = 0}
/*
* Reference:
* http://infocenter.arm.com/help/topic/com.arm.doc.ihi0057b/IHI0057B_aadwarf64.pdf
*/
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),
REG_DWARFNUM_NAME("%lr", 30),
REG_DWARFNUM_NAME("%sp", 31),
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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@ -0,0 +1,82 @@
#include <errno.h>
#include <libunwind.h>
#include "perf_regs.h"
#include "../../util/unwind.h"
int libunwind__arch_reg_id(int regnum)
{
switch (regnum) {
case UNW_AARCH64_X0:
return PERF_REG_ARM64_X0;
case UNW_AARCH64_X1:
return PERF_REG_ARM64_X1;
case UNW_AARCH64_X2:
return PERF_REG_ARM64_X2;
case UNW_AARCH64_X3:
return PERF_REG_ARM64_X3;
case UNW_AARCH64_X4:
return PERF_REG_ARM64_X4;
case UNW_AARCH64_X5:
return PERF_REG_ARM64_X5;
case UNW_AARCH64_X6:
return PERF_REG_ARM64_X6;
case UNW_AARCH64_X7:
return PERF_REG_ARM64_X7;
case UNW_AARCH64_X8:
return PERF_REG_ARM64_X8;
case UNW_AARCH64_X9:
return PERF_REG_ARM64_X9;
case UNW_AARCH64_X10:
return PERF_REG_ARM64_X10;
case UNW_AARCH64_X11:
return PERF_REG_ARM64_X11;
case UNW_AARCH64_X12:
return PERF_REG_ARM64_X12;
case UNW_AARCH64_X13:
return PERF_REG_ARM64_X13;
case UNW_AARCH64_X14:
return PERF_REG_ARM64_X14;
case UNW_AARCH64_X15:
return PERF_REG_ARM64_X15;
case UNW_AARCH64_X16:
return PERF_REG_ARM64_X16;
case UNW_AARCH64_X17:
return PERF_REG_ARM64_X17;
case UNW_AARCH64_X18:
return PERF_REG_ARM64_X18;
case UNW_AARCH64_X19:
return PERF_REG_ARM64_X19;
case UNW_AARCH64_X20:
return PERF_REG_ARM64_X20;
case UNW_AARCH64_X21:
return PERF_REG_ARM64_X21;
case UNW_AARCH64_X22:
return PERF_REG_ARM64_X22;
case UNW_AARCH64_X23:
return PERF_REG_ARM64_X23;
case UNW_AARCH64_X24:
return PERF_REG_ARM64_X24;
case UNW_AARCH64_X25:
return PERF_REG_ARM64_X25;
case UNW_AARCH64_X26:
return PERF_REG_ARM64_X26;
case UNW_AARCH64_X27:
return PERF_REG_ARM64_X27;
case UNW_AARCH64_X28:
return PERF_REG_ARM64_X28;
case UNW_AARCH64_X29:
return PERF_REG_ARM64_X29;
case UNW_AARCH64_X30:
return PERF_REG_ARM64_LR;
case UNW_AARCH64_SP:
return PERF_REG_ARM64_SP;
case UNW_AARCH64_PC:
return PERF_REG_ARM64_PC;
default:
pr_err("unwind: invalid reg id %d\n", regnum);
return -EINVAL;
}
return -EINVAL;
}

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@ -29,11 +29,17 @@ ifeq ($(ARCH),x86)
endif
NO_PERF_REGS := 0
endif
ifeq ($(ARCH),arm)
NO_PERF_REGS := 0
LIBUNWIND_LIBS = -lunwind -lunwind-arm
endif
ifeq ($(ARCH),arm64)
NO_PERF_REGS := 0
LIBUNWIND_LIBS = -lunwind -lunwind-aarch64
endif
# So far there's only x86 libdw unwind support merged in perf.
# Disable it on all other architectures in case libdw unwind
# support is detected in system. Add supported architectures
@ -363,7 +369,7 @@ else
endif
ifndef NO_LIBUNWIND
ifeq ($(ARCH),arm)
ifeq ($(ARCH),$(filter $(ARCH),arm arm64))
$(call feature_check,libunwind-debug-frame)
ifneq ($(feature-libunwind-debug-frame), 1)
msg := $(warning No debug_frame support found in libunwind);