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csky: Add support for libdw 

This patch add support for DWARF register mappings and libdw registers
initialization, which is used by perf callchain analyzing when
--call-graph=dwarf is given.

Here is the elfutils csky backend patch set:

https://sourceware.org/ml/elfutils-devel/2019-q2/msg00007.html

Signed-off-by: Mao Han <han_mao@c-sky.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: linux-arch@vger.kernel.org
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1555860794-10572-1-git-send-email-guoren@kernel.org
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.2
Mao Han 2019-04-21 23:33:14 +08:00 committed by Arnaldo Carvalho de Melo
parent 1455ea2391
commit b399ec215b
8 changed files with 288 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

51
tools/arch/csky/include/uapi/asm/perf_regs.h 100644
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@ -0,0 +1,51 @@
/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef _ASM_CSKY_PERF_REGS_H
#define _ASM_CSKY_PERF_REGS_H
/* Index of struct pt_regs */
enum perf_event_csky_regs {
PERF_REG_CSKY_TLS,
PERF_REG_CSKY_LR,
PERF_REG_CSKY_PC,
PERF_REG_CSKY_SR,
PERF_REG_CSKY_SP,
PERF_REG_CSKY_ORIG_A0,
PERF_REG_CSKY_A0,
PERF_REG_CSKY_A1,
PERF_REG_CSKY_A2,
PERF_REG_CSKY_A3,
PERF_REG_CSKY_REGS0,
PERF_REG_CSKY_REGS1,
PERF_REG_CSKY_REGS2,
PERF_REG_CSKY_REGS3,
PERF_REG_CSKY_REGS4,
PERF_REG_CSKY_REGS5,
PERF_REG_CSKY_REGS6,
PERF_REG_CSKY_REGS7,
PERF_REG_CSKY_REGS8,
PERF_REG_CSKY_REGS9,
#if defined(__CSKYABIV2__)
PERF_REG_CSKY_EXREGS0,
PERF_REG_CSKY_EXREGS1,
PERF_REG_CSKY_EXREGS2,
PERF_REG_CSKY_EXREGS3,
PERF_REG_CSKY_EXREGS4,
PERF_REG_CSKY_EXREGS5,
PERF_REG_CSKY_EXREGS6,
PERF_REG_CSKY_EXREGS7,
PERF_REG_CSKY_EXREGS8,
PERF_REG_CSKY_EXREGS9,
PERF_REG_CSKY_EXREGS10,
PERF_REG_CSKY_EXREGS11,
PERF_REG_CSKY_EXREGS12,
PERF_REG_CSKY_EXREGS13,
PERF_REG_CSKY_EXREGS14,
PERF_REG_CSKY_HI,
PERF_REG_CSKY_LO,
PERF_REG_CSKY_DCSR,
#endif
PERF_REG_CSKY_MAX,
};
#endif /* _ASM_CSKY_PERF_REGS_H */

6
tools/perf/Makefile.config
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@ -59,6 +59,10 @@ ifeq ($(SRCARCH),arm64)
LIBUNWIND_LIBS = -lunwind -lunwind-aarch64
endif
ifeq ($(SRCARCH),csky)
NO_PERF_REGS := 0
endif
ifeq ($(ARCH),s390)
NO_PERF_REGS := 0
NO_SYSCALL_TABLE := 0
@ -77,7 +81,7 @@ endif
# Disable it on all other architectures in case libdw unwind
# support is detected in system. Add supported architectures
# to the check.
ifneq ($(SRCARCH),$(filter $(SRCARCH),x86 arm arm64 powerpc s390))
ifneq ($(SRCARCH),$(filter $(SRCARCH),x86 arm arm64 powerpc s390 csky))
NO_LIBDW_DWARF_UNWIND := 1
endif

1
tools/perf/arch/csky/Build 100644
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@ -0,0 +1 @@
perf-y += util/

3
tools/perf/arch/csky/Makefile 100644
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@ -0,0 +1,3 @@
ifndef NO_DWARF
PERF_HAVE_DWARF_REGS := 1
endif

100
tools/perf/arch/csky/include/perf_regs.h 100644
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@ -0,0 +1,100 @@
/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef ARCH_PERF_REGS_H
#define ARCH_PERF_REGS_H
#include <stdlib.h>
#include <linux/types.h>
#include <asm/perf_regs.h>
#define PERF_REGS_MASK ((1ULL << PERF_REG_CSKY_MAX) - 1)
#define PERF_REGS_MAX PERF_REG_CSKY_MAX
#define PERF_SAMPLE_REGS_ABI PERF_SAMPLE_REGS_ABI_32
#define PERF_REG_IP PERF_REG_CSKY_PC
#define PERF_REG_SP PERF_REG_CSKY_SP
static inline const char *perf_reg_name(int id)
{
switch (id) {
case PERF_REG_CSKY_A0:
return "a0";
case PERF_REG_CSKY_A1:
return "a1";
case PERF_REG_CSKY_A2:
return "a2";
case PERF_REG_CSKY_A3:
return "a3";
case PERF_REG_CSKY_REGS0:
return "regs0";
case PERF_REG_CSKY_REGS1:
return "regs1";
case PERF_REG_CSKY_REGS2:
return "regs2";
case PERF_REG_CSKY_REGS3:
return "regs3";
case PERF_REG_CSKY_REGS4:
return "regs4";
case PERF_REG_CSKY_REGS5:
return "regs5";
case PERF_REG_CSKY_REGS6:
return "regs6";
case PERF_REG_CSKY_REGS7:
return "regs7";
case PERF_REG_CSKY_REGS8:
return "regs8";
case PERF_REG_CSKY_REGS9:
return "regs9";
case PERF_REG_CSKY_SP:
return "sp";
case PERF_REG_CSKY_LR:
return "lr";
case PERF_REG_CSKY_PC:
return "pc";
#if defined(__CSKYABIV2__)
case PERF_REG_CSKY_EXREGS0:
return "exregs0";
case PERF_REG_CSKY_EXREGS1:
return "exregs1";
case PERF_REG_CSKY_EXREGS2:
return "exregs2";
case PERF_REG_CSKY_EXREGS3:
return "exregs3";
case PERF_REG_CSKY_EXREGS4:
return "exregs4";
case PERF_REG_CSKY_EXREGS5:
return "exregs5";
case PERF_REG_CSKY_EXREGS6:
return "exregs6";
case PERF_REG_CSKY_EXREGS7:
return "exregs7";
case PERF_REG_CSKY_EXREGS8:
return "exregs8";
case PERF_REG_CSKY_EXREGS9:
return "exregs9";
case PERF_REG_CSKY_EXREGS10:
return "exregs10";
case PERF_REG_CSKY_EXREGS11:
return "exregs11";
case PERF_REG_CSKY_EXREGS12:
return "exregs12";
case PERF_REG_CSKY_EXREGS13:
return "exregs13";
case PERF_REG_CSKY_EXREGS14:
return "exregs14";
case PERF_REG_CSKY_TLS:
return "tls";
case PERF_REG_CSKY_HI:
return "hi";
case PERF_REG_CSKY_LO:
return "lo";
#endif
default:
return NULL;
}
return NULL;
}
#endif /* ARCH_PERF_REGS_H */

2
tools/perf/arch/csky/util/Build 100644
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@ -0,0 +1,2 @@
perf-$(CONFIG_DWARF) += dwarf-regs.o
perf-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o

49
tools/perf/arch/csky/util/dwarf-regs.c 100644
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@ -0,0 +1,49 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
// Mapping of DWARF debug register numbers into register names.
#include <stddef.h>
#include <dwarf-regs.h>
#if defined(__CSKYABIV2__)
#define CSKY_MAX_REGS 73
const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
/* r0 ~ r8 */
"%a0", "%a1", "%a2", "%a3", "%regs0", "%regs1", "%regs2", "%regs3",
/* r9 ~ r15 */
"%regs4", "%regs5", "%regs6", "%regs7", "%regs8", "%regs9", "%sp",
"%lr",
/* r16 ~ r23 */
"%exregs0", "%exregs1", "%exregs2", "%exregs3", "%exregs4",
"%exregs5", "%exregs6", "%exregs7",
/* r24 ~ r31 */
"%exregs8", "%exregs9", "%exregs10", "%exregs11", "%exregs12",
"%exregs13", "%exregs14", "%tls",
"%pc", NULL, NULL, NULL, "%hi", "%lo", NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
"%epc",
};
#else
#define CSKY_MAX_REGS 57
const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
/* r0 ~ r8 */
"%sp", "%regs9", "%a0", "%a1", "%a2", "%a3", "%regs0", "%regs1",
/* r9 ~ r15 */
"%regs2", "%regs3", "%regs4", "%regs5", "%regs6", "%regs7", "%regs8",
"%lr",
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
"%epc",
};
#endif
const char *get_arch_regstr(unsigned int n)
{
return (n < CSKY_MAX_REGS) ? csky_dwarf_regs_table[n] : NULL;
}

77
tools/perf/arch/csky/util/unwind-libdw.c 100644
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@ -0,0 +1,77 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
#include <elfutils/libdwfl.h>
#include "../../util/unwind-libdw.h"
#include "../../util/perf_regs.h"
#include "../../util/event.h"
bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
{
struct unwind_info *ui = arg;
struct regs_dump *user_regs = &ui->sample->user_regs;
Dwarf_Word dwarf_regs[PERF_REG_CSKY_MAX];
#define REG(r) ({ \
Dwarf_Word val = 0; \
perf_reg_value(&val, user_regs, PERF_REG_CSKY_##r); \
val; \
})
#if defined(__CSKYABIV2__)
dwarf_regs[0] = REG(A0);
dwarf_regs[1] = REG(A1);
dwarf_regs[2] = REG(A2);
dwarf_regs[3] = REG(A3);
dwarf_regs[4] = REG(REGS0);
dwarf_regs[5] = REG(REGS1);
dwarf_regs[6] = REG(REGS2);
dwarf_regs[7] = REG(REGS3);
dwarf_regs[8] = REG(REGS4);
dwarf_regs[9] = REG(REGS5);
dwarf_regs[10] = REG(REGS6);
dwarf_regs[11] = REG(REGS7);
dwarf_regs[12] = REG(REGS8);
dwarf_regs[13] = REG(REGS9);
dwarf_regs[14] = REG(SP);
dwarf_regs[15] = REG(LR);
dwarf_regs[16] = REG(EXREGS0);
dwarf_regs[17] = REG(EXREGS1);
dwarf_regs[18] = REG(EXREGS2);
dwarf_regs[19] = REG(EXREGS3);
dwarf_regs[20] = REG(EXREGS4);
dwarf_regs[21] = REG(EXREGS5);
dwarf_regs[22] = REG(EXREGS6);
dwarf_regs[23] = REG(EXREGS7);
dwarf_regs[24] = REG(EXREGS8);
dwarf_regs[25] = REG(EXREGS9);
dwarf_regs[26] = REG(EXREGS10);
dwarf_regs[27] = REG(EXREGS11);
dwarf_regs[28] = REG(EXREGS12);
dwarf_regs[29] = REG(EXREGS13);
dwarf_regs[30] = REG(EXREGS14);
dwarf_regs[31] = REG(TLS);
dwarf_regs[32] = REG(PC);
#else
dwarf_regs[0] = REG(SP);
dwarf_regs[1] = REG(REGS9);
dwarf_regs[2] = REG(A0);
dwarf_regs[3] = REG(A1);
dwarf_regs[4] = REG(A2);
dwarf_regs[5] = REG(A3);
dwarf_regs[6] = REG(REGS0);
dwarf_regs[7] = REG(REGS1);
dwarf_regs[8] = REG(REGS2);
dwarf_regs[9] = REG(REGS3);
dwarf_regs[10] = REG(REGS4);
dwarf_regs[11] = REG(REGS5);
dwarf_regs[12] = REG(REGS6);
dwarf_regs[13] = REG(REGS7);
dwarf_regs[14] = REG(REGS8);
dwarf_regs[15] = REG(LR);
#endif
dwfl_thread_state_register_pc(thread, REG(PC));
return dwfl_thread_state_registers(thread, 0, PERF_REG_CSKY_MAX,
dwarf_regs);
}