From: Ian Rogers <irogers@google.com>
To: "Peter Zijlstra" <peterz@infradead.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Arnaldo Carvalho de Melo" <acme@kernel.org>,
"Namhyung Kim" <namhyung@kernel.org>,
"Jiri Olsa" <jolsa@kernel.org>, "Ian Rogers" <irogers@google.com>,
"Adrian Hunter" <adrian.hunter@intel.com>,
"James Clark" <james.clark@linaro.org>,
"John Garry" <john.g.garry@oracle.com>,
"Will Deacon" <will@kernel.org>, "Leo Yan" <leo.yan@linux.dev>,
"Guo Ren" <guoren@kernel.org>, "Paul Walmsley" <pjw@kernel.org>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Albert Ou" <aou@eecs.berkeley.edu>,
"Alexandre Ghiti" <alex@ghiti.fr>,
"Shimin Guo" <shimin.guo@skydio.com>,
"Athira Rajeev" <atrajeev@linux.ibm.com>,
"Stephen Brennan" <stephen.s.brennan@oracle.com>,
"Howard Chu" <howardchu95@gmail.com>,
"Thomas Falcon" <thomas.falcon@intel.com>,
"Andi Kleen" <ak@linux.intel.com>,
"Dr. David Alan Gilbert" <linux@treblig.org>,
"Dmitry Vyukov" <dvyukov@google.com>,
"Krzysztof Łopatowski" <krzysztof.m.lopatowski@gmail.com>,
"Chun-Tse Shao" <ctshao@google.com>,
"Aditya Bodkhe" <aditya.b1@linux.ibm.com>,
"Haibo Xu" <haibo1.xu@intel.com>,
"Sergei Trofimovich" <slyich@gmail.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org,
linux-riscv@lists.infradead.org, "Mark Wielaard" <mark@klomp.org>
Subject: [PATCH v1 19/23] perf dwarf-regs: Add S390 perf to dwarf register number mapping functions
Date: Fri, 16 Jan 2026 21:28:45 -0800 [thread overview]
Message-ID: <20260117052849.2205545-20-irogers@google.com> (raw)
In-Reply-To: <20260117052849.2205545-1-irogers@google.com>
These functions allow the generic initial register state code in
unwind-libdw to be used. Now the non-generic code in unwind-libdw has
no uses remove it.
Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/dwarf-regs-arch/Build | 1 +
.../util/dwarf-regs-arch/dwarf-regs-s390.c | 53 +++++++++++++++
tools/perf/util/dwarf-regs.c | 3 +
tools/perf/util/include/dwarf-regs.h | 1 +
tools/perf/util/unwind-libdw-arch/Build | 1 -
.../unwind-libdw-arch/unwind-libdw-s390.c | 65 -------------------
tools/perf/util/unwind-libdw.c | 31 ++-------
tools/perf/util/unwind-libdw.h | 1 -
8 files changed, 62 insertions(+), 94 deletions(-)
create mode 100644 tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
delete mode 100644 tools/perf/util/unwind-libdw-arch/Build
delete mode 100644 tools/perf/util/unwind-libdw-arch/unwind-libdw-s390.c
diff --git a/tools/perf/util/dwarf-regs-arch/Build b/tools/perf/util/dwarf-regs-arch/Build
index 94e4dfceb4d1..10c2af3d933a 100644
--- a/tools/perf/util/dwarf-regs-arch/Build
+++ b/tools/perf/util/dwarf-regs-arch/Build
@@ -4,4 +4,5 @@ perf-util-$(CONFIG_LIBDW) += dwarf-regs-csky.o
perf-util-$(CONFIG_LIBDW) += dwarf-regs-loongarch.o
perf-util-$(CONFIG_LIBDW) += dwarf-regs-powerpc.o
perf-util-$(CONFIG_LIBDW) += dwarf-regs-riscv.o
+perf-util-$(CONFIG_LIBDW) += dwarf-regs-s390.o
perf-util-$(CONFIG_LIBDW) += dwarf-regs-x86.o
diff --git a/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c b/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
new file mode 100644
index 000000000000..310a37451bdc
--- /dev/null
+++ b/tools/perf/util/dwarf-regs-arch/dwarf-regs-s390.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <dwarf-regs.h>
+#include "../../../arch/s390/include/uapi/asm/perf_regs.h"
+
+int __get_dwarf_regnum_for_perf_regnum_s390(int perf_regnum)
+{
+ static const int dwarf_s390_regnums[] = {
+ [PERF_REG_S390_R0] = 0,
+ [PERF_REG_S390_R1] = 1,
+ [PERF_REG_S390_R2] = 2,
+ [PERF_REG_S390_R3] = 3,
+ [PERF_REG_S390_R4] = 4,
+ [PERF_REG_S390_R5] = 5,
+ [PERF_REG_S390_R6] = 6,
+ [PERF_REG_S390_R7] = 7,
+ [PERF_REG_S390_R8] = 8,
+ [PERF_REG_S390_R9] = 9,
+ [PERF_REG_S390_R10] = 10,
+ [PERF_REG_S390_R11] = 11,
+ [PERF_REG_S390_R12] = 12,
+ [PERF_REG_S390_R13] = 13,
+ [PERF_REG_S390_R14] = 14,
+ [PERF_REG_S390_R15] = 15,
+ [PERF_REG_S390_FP0] = 16,
+ [PERF_REG_S390_FP1] = 20,
+ [PERF_REG_S390_FP2] = 17,
+ [PERF_REG_S390_FP3] = 21,
+ [PERF_REG_S390_FP4] = 18,
+ [PERF_REG_S390_FP5] = 22,
+ [PERF_REG_S390_FP6] = 19,
+ [PERF_REG_S390_FP7] = 23,
+ [PERF_REG_S390_FP8] = 24,
+ [PERF_REG_S390_FP9] = 28,
+ [PERF_REG_S390_FP10] = 25,
+ [PERF_REG_S390_FP11] = 29,
+ [PERF_REG_S390_FP12] = 26,
+ [PERF_REG_S390_FP13] = 30,
+ [PERF_REG_S390_FP14] = 27,
+ [PERF_REG_S390_FP15] = 31,
+ [PERF_REG_S390_MASK] = 64,
+ [PERF_REG_S390_PC] = 65,
+ };
+
+ if (perf_regnum == 0)
+ return 0;
+
+ if (perf_regnum < 0 || perf_regnum > (int)ARRAY_SIZE(dwarf_s390_regnums) ||
+ dwarf_s390_regnums[perf_regnum] == 0)
+ return -ENOENT;
+
+ return dwarf_s390_regnums[perf_regnum];
+}
diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
index 137568e15018..f86f76547592 100644
--- a/tools/perf/util/dwarf-regs.c
+++ b/tools/perf/util/dwarf-regs.c
@@ -212,6 +212,9 @@ int get_dwarf_regnum_for_perf_regnum(int perf_regnum, unsigned int machine,
case EM_RISCV:
reg = __get_dwarf_regnum_for_perf_regnum_riscv(perf_regnum);
break;
+ case EM_S390:
+ reg = __get_dwarf_regnum_for_perf_regnum_s390(perf_regnum);
+ break;
case EM_LOONGARCH:
reg = __get_dwarf_regnum_for_perf_regnum_loongarch(perf_regnum);
break;
diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
index ae76608da110..b95cf2d7b5b3 100644
--- a/tools/perf/util/include/dwarf-regs.h
+++ b/tools/perf/util/include/dwarf-regs.h
@@ -112,6 +112,7 @@ int __get_dwarf_regnum_for_perf_regnum_csky(int perf_regnum, unsigned int flags)
int __get_dwarf_regnum_for_perf_regnum_loongarch(int perf_regnum);
int __get_dwarf_regnum_for_perf_regnum_powerpc(int perf_regnum);
int __get_dwarf_regnum_for_perf_regnum_riscv(int perf_regnum);
+int __get_dwarf_regnum_for_perf_regnum_s390(int perf_regnum);
/*
* get_dwarf_regnum - Returns DWARF regnum from register name
diff --git a/tools/perf/util/unwind-libdw-arch/Build b/tools/perf/util/unwind-libdw-arch/Build
deleted file mode 100644
index 6d6e319e1201..000000000000
--- a/tools/perf/util/unwind-libdw-arch/Build
+++ /dev/null
@@ -1 +0,0 @@
-perf-util-y += unwind-libdw-s390.o
diff --git a/tools/perf/util/unwind-libdw-arch/unwind-libdw-s390.c b/tools/perf/util/unwind-libdw-arch/unwind-libdw-s390.c
deleted file mode 100644
index 1e05e9d9d95f..000000000000
--- a/tools/perf/util/unwind-libdw-arch/unwind-libdw-s390.c
+++ /dev/null
@@ -1,65 +0,0 @@
-#include <linux/kernel.h>
-#include <elfutils/libdwfl.h>
-#include "util/unwind-libdw.h"
-#include "util/perf_regs.h"
-#include "util/event.h"
-#include "util/sample.h"
-#include "../arch/s390/include/dwarf-regs-table.h"
-#include "../arch/s390/include/uapi/asm/perf_regs.h"
-
-
-bool libdw_set_initial_registers_s390(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[ARRAY_SIZE(s390_dwarf_regs)];
-
-#define REG(r) ({ \
- Dwarf_Word val = 0; \
- perf_reg_value(&val, user_regs, PERF_REG_S390_##r); \
- val; \
-})
- /*
- * For DWARF register mapping details,
- * see also perf/arch/s390/include/dwarf-regs-table.h
- */
- dwarf_regs[0] = REG(R0);
- dwarf_regs[1] = REG(R1);
- dwarf_regs[2] = REG(R2);
- dwarf_regs[3] = REG(R3);
- dwarf_regs[4] = REG(R4);
- dwarf_regs[5] = REG(R5);
- dwarf_regs[6] = REG(R6);
- dwarf_regs[7] = REG(R7);
- dwarf_regs[8] = REG(R8);
- dwarf_regs[9] = REG(R9);
- dwarf_regs[10] = REG(R10);
- dwarf_regs[11] = REG(R11);
- dwarf_regs[12] = REG(R12);
- dwarf_regs[13] = REG(R13);
- dwarf_regs[14] = REG(R14);
- dwarf_regs[15] = REG(R15);
-
- dwarf_regs[16] = REG(FP0);
- dwarf_regs[17] = REG(FP2);
- dwarf_regs[18] = REG(FP4);
- dwarf_regs[19] = REG(FP6);
- dwarf_regs[20] = REG(FP1);
- dwarf_regs[21] = REG(FP3);
- dwarf_regs[22] = REG(FP5);
- dwarf_regs[23] = REG(FP7);
- dwarf_regs[24] = REG(FP8);
- dwarf_regs[25] = REG(FP10);
- dwarf_regs[26] = REG(FP12);
- dwarf_regs[27] = REG(FP14);
- dwarf_regs[28] = REG(FP9);
- dwarf_regs[29] = REG(FP11);
- dwarf_regs[30] = REG(FP13);
- dwarf_regs[31] = REG(FP15);
-
- dwarf_regs[64] = REG(MASK);
- dwarf_regs[65] = REG(PC);
-
- dwfl_thread_state_register_pc(thread, dwarf_regs[65]);
- return dwfl_thread_state_registers(thread, 0, 32, dwarf_regs);
-}
diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index b3c4380d40b6..e0321043af88 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -226,7 +226,7 @@ static bool memory_read(Dwfl *dwfl __maybe_unused, Dwarf_Addr addr, Dwarf_Word *
return true;
}
-static bool libdw_set_initial_registers_generic(Dwfl_Thread *thread, void *arg)
+static bool libdw_set_initial_registers(Dwfl_Thread *thread, void *arg)
{
struct unwind_info *ui = arg;
struct regs_dump *user_regs = perf_sample__user_regs(ui->sample);
@@ -279,29 +279,12 @@ static bool libdw_set_initial_registers_generic(Dwfl_Thread *thread, void *arg)
return ret;
}
-#define DEFINE_DWFL_THREAD_CALLBACKS(arch) \
-static const Dwfl_Thread_Callbacks callbacks_##arch = { \
- .next_thread = next_thread, \
- .memory_read = memory_read, \
- .set_initial_registers = libdw_set_initial_registers_##arch, \
-}
-
-static const Dwfl_Thread_Callbacks callbacks_generic = {
+static const Dwfl_Thread_Callbacks callbacks = {
.next_thread = next_thread,
.memory_read = memory_read,
- .set_initial_registers = libdw_set_initial_registers_generic,
+ .set_initial_registers = libdw_set_initial_registers,
};
-DEFINE_DWFL_THREAD_CALLBACKS(s390);
-
-static const Dwfl_Thread_Callbacks *get_thread_callbacks(const char *arch)
-{
- if (!strcmp(arch, "s390"))
- return &callbacks_s390;
-
- return &callbacks_generic;
-}
-
static int
frame_callback(Dwfl_Frame *state, void *arg)
{
@@ -349,10 +332,8 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
.e_machine = e_machine,
.best_effort = best_effort
};
- const char *arch = perf_env__arch(machine->env);
Dwarf_Word ip;
int err = -EINVAL, i;
- const Dwfl_Thread_Callbacks *callbacks;
if (!data->user_regs || !data->user_regs->regs)
return -EINVAL;
@@ -375,11 +356,7 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
if (err)
goto out;
- callbacks = get_thread_callbacks(arch);
- if (!callbacks)
- goto out;
-
- err = !dwfl_attach_state(ui->dwfl, /*elf=*/NULL, thread__tid(thread), callbacks, ui);
+ err = !dwfl_attach_state(ui->dwfl, /*elf=*/NULL, thread__tid(thread), &callbacks, ui);
if (err)
goto out;
diff --git a/tools/perf/util/unwind-libdw.h b/tools/perf/util/unwind-libdw.h
index 5c23080cb6c1..20d63d881dff 100644
--- a/tools/perf/util/unwind-libdw.h
+++ b/tools/perf/util/unwind-libdw.h
@@ -10,7 +10,6 @@ struct perf_sample;
struct thread;
bool libdw_set_initial_registers_mips(Dwfl_Thread *thread, void *arg);
-bool libdw_set_initial_registers_s390(Dwfl_Thread *thread, void *arg);
struct unwind_info {
Dwfl *dwfl;
--
2.52.0.457.g6b5491de43-goog
next prev parent reply other threads:[~2026-01-17 5:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-17 5:28 [PATCH v1 00/23] perf dwarf/libdw extra support, speed and clean ups Ian Rogers
2026-01-17 5:28 ` [PATCH v1 01/23] perf symbol-elf: Fix leak of ELF files with GNU debugdata Ian Rogers
2026-01-17 5:28 ` [PATCH v1 02/23] perf dso: Extra validity checks that e_machine is valid Ian Rogers
2026-01-17 5:28 ` [PATCH v1 03/23] perf record: Disable inline frames when marking build IDs Ian Rogers
2026-01-17 5:28 ` [PATCH v1 04/23] perf unwind-libdw: fix a cross-arch unwinding bug Ian Rogers
2026-01-20 16:02 ` Arnaldo Carvalho de Melo
2026-01-20 17:53 ` Ian Rogers
2026-01-17 5:28 ` [PATCH v1 05/23] perf libdw_addr2line: Fixes to srcline memory allocation Ian Rogers
2026-01-17 5:28 ` [PATCH v1 06/23] perf unwind-libdw: Correct argument to dwfl_attach_state Ian Rogers
2026-01-17 5:28 ` [PATCH v1 07/23] perf powerpc: Unify the skip-callchain-idx libdw with that for addr2line Ian Rogers
2026-01-17 5:28 ` [PATCH v1 08/23] perf perf_regs: Switch from arch string to int e_machine Ian Rogers
2026-01-20 18:49 ` Arnaldo Carvalho de Melo
2026-01-21 6:58 ` Mi, Dapeng
2026-01-21 7:10 ` Ian Rogers
2026-01-17 5:28 ` [PATCH v1 09/23] perf dwarf-regs: Add util/dwarf-regs-arch for consistency with perf-regs Ian Rogers
2026-01-17 5:28 ` [PATCH v1 10/23] perf dwarf-regs: Remove get_arch_regnum Ian Rogers
2026-01-17 5:28 ` [PATCH v1 11/23] perf dwarf-regs: Clean up x86 dwarf_regnum code Ian Rogers
2026-01-17 5:28 ` [PATCH v1 12/23] perf dwarf-regs: Add get_dwarf_regnum_for_perf_regnum and use for x86 unwinding Ian Rogers
2026-01-17 5:42 ` Ian Rogers
2026-01-17 5:28 ` [PATCH v1 13/23] perf dwarf-regs: Add basic get_dwarf_regnum for most architectures Ian Rogers
2026-01-17 5:28 ` [PATCH v1 14/23] perf dwarf-regs: Add ARM perf to dwarf register number mapping functions Ian Rogers
2026-01-17 5:28 ` [PATCH v1 15/23] perf dwarf-regs: Add csky " Ian Rogers
2026-01-17 5:28 ` [PATCH v1 16/23] perf dwarf-regs: Add loongarch " Ian Rogers
2026-01-17 5:28 ` [PATCH v1 17/23] perf dwarf-regs: Add powerpc " Ian Rogers
2026-01-17 5:28 ` [PATCH v1 18/23] perf dwarf-regs: Add RISC-V " Ian Rogers
2026-01-17 5:28 ` Ian Rogers [this message]
2026-01-17 5:28 ` [PATCH v1 20/23] perf dwarf-regs: Add MIPS " Ian Rogers
2026-01-17 5:28 ` [PATCH v1 21/23] perf build: Remove NO_LIBDW_DWARF_UNWIND option Ian Rogers
2026-01-17 5:28 ` [PATCH v1 22/23] perf unwind-libdw: Don't discard loaded ELF/Dwarf after every unwind Ian Rogers
2026-01-27 17:42 ` Serhei Makarov
2026-01-27 18:08 ` Ian Rogers
2026-01-17 5:28 ` [PATCH v1 23/23] perf machine: Add inline information to frame pointer and LBR callchains Ian Rogers
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