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perf dwarf-regs: Add csky perf to dwarf register number mapping functions

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These functions allow the generic initial register state code in
unwind-libdw to be used.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Aditya Bodkhe <aditya.b1@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.ibm.com>
Cc: Chun-Tse Shao <ctshao@google.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Dr. David Alan Gilbert <linux@treblig.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Haibo Xu <haibo1.xu@intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Krzysztof Łopatowski <krzysztof.m.lopatowski@gmail.com>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Mark Wielaard <mark@klomp.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <pjw@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sergei Trofimovich <slyich@gmail.com>
Cc: Shimin Guo <shimin.guo@skydio.com>
Cc: Stephen Brennan <stephen.s.brennan@oracle.com>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2026-01-16 21:28:41 -08:00 committed by Arnaldo Carvalho de Melo
parent 8b863e70e2
commit 8cac4013b0
7 changed files with 64 additions and 84 deletions
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58
tools/perf/util/dwarf-regs-arch/dwarf-regs-csky.c
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@ -5,6 +5,10 @@
#include <errno.h>
#include <stddef.h>
#include <dwarf-regs.h>
// Ensure the V2 perf reg definitions are included.
#undef __CSKYABIV2__
#define __CSKYABIV2__ 1
#include "../../../arch/csky/include/uapi/asm/perf_regs.h"
#define CSKY_ABIV2_MAX_REGS 73
static const char * const csky_dwarf_regs_table_abiv2[CSKY_ABIV2_MAX_REGS] = {
@ -66,3 +70,57 @@ int __get_csky_regnum(const char *name, unsigned int flags)
return __get_dwarf_regnum(csky_dwarf_regs_table_abiv1, CSKY_ABIV1_MAX_REGS, name);
}
int __get_dwarf_regnum_for_perf_regnum_csky(int perf_regnum, unsigned int flags)
{
static const int dwarf_csky_regnums[][2] = {
[PERF_REG_CSKY_TLS] = {-ENOENT, 31},
[PERF_REG_CSKY_LR] = {15, 15},
[PERF_REG_CSKY_PC] = {-ENOENT, 32},
/* TODO: PERF_REG_CSKY_SR */
[PERF_REG_CSKY_SP] = {0, 14},
/* TODO: PERF_REG_CSKY_ORIG_A0 */
[PERF_REG_CSKY_A0] = {2, 0},
[PERF_REG_CSKY_A1] = {3, 1},
[PERF_REG_CSKY_A2] = {4, 2},
[PERF_REG_CSKY_A3] = {5, 3},
[PERF_REG_CSKY_REGS0] = {6, 4},
[PERF_REG_CSKY_REGS1] = {7, 5},
[PERF_REG_CSKY_REGS2] = {8, 6},
[PERF_REG_CSKY_REGS3] = {9, 7},
[PERF_REG_CSKY_REGS4] = {10, 8},
[PERF_REG_CSKY_REGS5] = {11, 9},
[PERF_REG_CSKY_REGS6] = {12, 10},
[PERF_REG_CSKY_REGS7] = {13, 11},
[PERF_REG_CSKY_REGS8] = {14, 12},
[PERF_REG_CSKY_REGS9] = {1, 13},
[PERF_REG_CSKY_EXREGS0] = {-ENOENT, 16},
[PERF_REG_CSKY_EXREGS1] = {-ENOENT, 17},
[PERF_REG_CSKY_EXREGS2] = {-ENOENT, 18},
[PERF_REG_CSKY_EXREGS3] = {-ENOENT, 19},
[PERF_REG_CSKY_EXREGS4] = {-ENOENT, 20},
[PERF_REG_CSKY_EXREGS5] = {-ENOENT, 21},
[PERF_REG_CSKY_EXREGS6] = {-ENOENT, 22},
[PERF_REG_CSKY_EXREGS7] = {-ENOENT, 23},
[PERF_REG_CSKY_EXREGS8] = {-ENOENT, 24},
[PERF_REG_CSKY_EXREGS9] = {-ENOENT, 25},
[PERF_REG_CSKY_EXREGS10] = {-ENOENT, 26},
[PERF_REG_CSKY_EXREGS11] = {-ENOENT, 27},
[PERF_REG_CSKY_EXREGS12] = {-ENOENT, 28},
[PERF_REG_CSKY_EXREGS13] = {-ENOENT, 29},
[PERF_REG_CSKY_EXREGS14] = {-ENOENT, 30},
/* TODO: PERF_REG_CSKY_HI */
/* TODO: PERF_REG_CSKY_LO */
/* TODO: PERF_REG_CSKY_DCSR */
};
int idx = 0;
if (flags & EF_CSKY_ABIV2)
idx++;
if (perf_regnum < 0 || perf_regnum > (int)ARRAY_SIZE(dwarf_csky_regnums) ||
dwarf_csky_regnums[perf_regnum][idx] == 0)
return -ENOENT;
return dwarf_csky_regnums[perf_regnum][idx];
}

3
tools/perf/util/dwarf-regs.c
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@ -202,6 +202,9 @@ int get_dwarf_regnum_for_perf_regnum(int perf_regnum, unsigned int machine,
case EM_AARCH64:
reg = __get_dwarf_regnum_for_perf_regnum_arm64(perf_regnum);
break;
case EM_CSKY:
reg = __get_dwarf_regnum_for_perf_regnum_csky(perf_regnum, flags);
break;
default:
pr_err("ELF MACHINE %x is not supported.\n", machine);
return -ENOENT;

2
tools/perf/util/include/dwarf-regs.h
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@ -108,6 +108,8 @@ int __get_dwarf_regnum_for_perf_regnum_x86_64(int perf_regnum);
int __get_dwarf_regnum_for_perf_regnum_arm(int perf_regnum);
int __get_dwarf_regnum_for_perf_regnum_arm64(int perf_regnum);
int __get_dwarf_regnum_for_perf_regnum_csky(int perf_regnum, unsigned int flags);
/*
* get_dwarf_regnum - Returns DWARF regnum from register name
* name: architecture register name

1
tools/perf/util/unwind-libdw-arch/Build
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@ -1,4 +1,3 @@
perf-util-y += unwind-libdw-csky.o
perf-util-y += unwind-libdw-loongarch.o
perf-util-y += unwind-libdw-powerpc.o
perf-util-y += unwind-libdw-riscv.o

78
tools/perf/util/unwind-libdw-arch/unwind-libdw-csky.c
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@ -1,78 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
#include <elfutils/libdwfl.h>
#include "../arch/csky/include/uapi/asm/perf_regs.h"
#include "util/unwind-libdw.h"
#include "util/perf_regs.h"
#include "util/sample.h"
bool libdw_set_initial_registers_csky(Dwfl_Thread *thread, void *arg)
{
struct unwind_info *ui = arg;
struct regs_dump *user_regs = perf_sample__user_regs(ui->sample);
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);
}

5
tools/perf/util/unwind-libdw.c
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@ -292,7 +292,6 @@ static const Dwfl_Thread_Callbacks callbacks_generic = {
.set_initial_registers = libdw_set_initial_registers_generic,
};
DEFINE_DWFL_THREAD_CALLBACKS(csky);
DEFINE_DWFL_THREAD_CALLBACKS(loongarch);
DEFINE_DWFL_THREAD_CALLBACKS(powerpc);
DEFINE_DWFL_THREAD_CALLBACKS(riscv);
@ -300,9 +299,7 @@ DEFINE_DWFL_THREAD_CALLBACKS(s390);
static const Dwfl_Thread_Callbacks *get_thread_callbacks(const char *arch)
{
if (!strcmp(arch, "csky"))
return &callbacks_csky;
else if (!strcmp(arch, "loongarch"))
if (!strcmp(arch, "loongarch"))
return &callbacks_loongarch;
else if (!strcmp(arch, "powerpc"))
return &callbacks_powerpc;

1
tools/perf/util/unwind-libdw.h
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@ -9,7 +9,6 @@ struct machine;
struct perf_sample;
struct thread;
bool libdw_set_initial_registers_csky(Dwfl_Thread *thread, void *arg);
bool libdw_set_initial_registers_loongarch(Dwfl_Thread *thread, void *arg);
bool libdw_set_initial_registers_mips(Dwfl_Thread *thread, void *arg);
bool libdw_set_initial_registers_powerpc(Dwfl_Thread *thread, void *arg);