| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20241007170927.f30fced63c5e777628bea311@kernel.org>
Date: Mon, 7 Oct 2024 17:09:27 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim
<namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander
Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa
<jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, Kan Liang
<kan.liang@...ux.intel.com>, John Garry <john.g.garry@...cle.com>, Will
Deacon <will@...nel.org>, James Clark <james.clark@...aro.org>, Mike Leach
<mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>, Guo Ren
<guoren@...nel.org>, Paul Walmsley <paul.walmsley@...ive.com>, Palmer
Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Nick
Terrell <terrelln@...com>, "Steven Rostedt (Google)" <rostedt@...dmis.org>,
Guilherme Amadio <amadio@...too.org>, Changbin Du <changbin.du@...wei.com>,
Daniel Bristot de Oliveira <bristot@...nel.org>, Daniel Wagner
<dwagner@...e.de>, Aditya Gupta <adityag@...ux.ibm.com>, Athira Rajeev
<atrajeev@...ux.vnet.ibm.com>, Masahiro Yamada <masahiroy@...nel.org>,
Kajol Jain <kjain@...ux.ibm.com>, Huacai Chen <chenhuacai@...nel.org>, Bibo
Mao <maobibo@...ngson.cn>, Anup Patel <anup@...infault.org>, Atish Patra
<atishp@...osinc.com>, Shenlin Liang <liangshenlin@...incomputing.com>,
Oliver Upton <oliver.upton@...ux.dev>, "Steinar H. Gunderson"
<sesse@...gle.com>, "Dr. David Alan Gilbert" <linux@...blig.org>, Chen Pei
<cp0613@...ux.alibaba.com>, Dima Kogan <dima@...retsauce.net>, Yury Norov
<yury.norov@...il.com>, Alexander Lobakin <aleksander.lobakin@...el.com>,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 17/31] perf dwarf-regs: Pass ELF flags to
get_dwarf_regstr
On Sat, 5 Oct 2024 12:55:27 -0700
Ian Rogers <irogers@...gle.com> wrote:
> Pass a flags value as architectures like csky need the flags to
> determine the ABI variant.
>
Same here. I need some examples of this chaneg.
Thank you,
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/util/dwarf-regs.c | 3 ++-
> tools/perf/util/include/dwarf-regs.h | 11 ++++++-----
> tools/perf/util/probe-finder.c | 13 +++++++------
> tools/perf/util/probe-finder.h | 3 ++-
> 4 files changed, 17 insertions(+), 13 deletions(-)
>
> diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
> index 1321387f6948..86b3ef638fbb 100644
> --- a/tools/perf/util/dwarf-regs.c
> +++ b/tools/perf/util/dwarf-regs.c
> @@ -29,7 +29,8 @@
> #define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
>
> /* Return architecture dependent register string (for kprobe-tracer) */
> -const char *get_dwarf_regstr(unsigned int n, unsigned int machine)
> +const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
> + unsigned int flags __maybe_unused)
> {
> switch (machine) {
> case EM_NONE: /* Generic arch - use host arch */
> diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
> index ee0a734564c7..925525405e2d 100644
> --- a/tools/perf/util/include/dwarf-regs.h
> +++ b/tools/perf/util/include/dwarf-regs.h
> @@ -80,12 +80,13 @@
>
> #ifdef HAVE_LIBDW_SUPPORT
> const char *get_arch_regstr(unsigned int n);
> -/*
> - * get_dwarf_regstr - Returns ftrace register string from DWARF regnum
> - * n: DWARF register number
> - * machine: ELF machine signature (EM_*)
> +/**
> + * get_dwarf_regstr() - Returns ftrace register string from DWARF regnum.
> + * @n: DWARF register number.
> + * @machine: ELF machine signature (EM_*).
> + * @flags: ELF flags for things like ABI differences.
> */
> -const char *get_dwarf_regstr(unsigned int n, unsigned int machine);
> +const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int flags);
>
> int get_arch_regnum(const char *name);
> /*
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 8019d232f515..29eaa9beca86 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -56,7 +56,7 @@ static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs)
> */
> static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
> Dwarf_Op *fb_ops, Dwarf_Die *sp_die,
> - unsigned int machine,
> + const struct probe_finder *pf,
> struct probe_trace_arg *tvar)
> {
> Dwarf_Attribute attr;
> @@ -166,7 +166,7 @@ static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr,
> if (!tvar)
> return ret2;
>
> - regs = get_dwarf_regstr(regn, machine);
> + regs = get_dwarf_regstr(regn, pf->e_machine, pf->e_flags);
> if (!regs) {
> /* This should be a bug in DWARF or this tool */
> pr_warning("Mapping for the register number %u "
> @@ -451,7 +451,7 @@ static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
> dwarf_diename(vr_die));
>
> ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops,
> - &pf->sp_die, pf->machine, pf->tvar);
> + &pf->sp_die, pf, pf->tvar);
> if (ret == -ENOENT && pf->skip_empty_arg)
> /* This can be found in other place. skip it */
> return 0;
> @@ -1134,7 +1134,8 @@ static int debuginfo__find_probes(struct debuginfo *dbg,
> if (gelf_getehdr(elf, &ehdr) == NULL)
> return -EINVAL;
>
> - pf->machine = ehdr.e_machine;
> + pf->e_machine = ehdr.e_machine;
> + pf->e_flags = ehdr.e_flags;
>
> do {
> GElf_Shdr shdr;
> @@ -1171,7 +1172,7 @@ static int copy_variables_cb(Dwarf_Die *die_mem, void *data)
> (tag == DW_TAG_variable && vf->vars)) {
> if (convert_variable_location(die_mem, vf->pf->addr,
> vf->pf->fb_ops, &pf->sp_die,
> - pf->machine, NULL) == 0) {
> + pf, /*tvar=*/NULL) == 0) {
> vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem);
> if (vf->args[vf->nargs].var == NULL) {
> vf->ret = -ENOMEM;
> @@ -1403,7 +1404,7 @@ static int collect_variables_cb(Dwarf_Die *die_mem, void *data)
> tag == DW_TAG_variable) {
> ret = convert_variable_location(die_mem, af->pf.addr,
> af->pf.fb_ops, &af->pf.sp_die,
> - af->pf.machine, NULL);
> + &af->pf, /*tvar=*/NULL);
> if (ret == 0 || ret == -ERANGE) {
> int ret2;
> bool externs = !af->child;
> diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
> index b9a5afca4cc1..71e21cb4492a 100644
> --- a/tools/perf/util/probe-finder.h
> +++ b/tools/perf/util/probe-finder.h
> @@ -68,7 +68,8 @@ struct probe_finder {
> /* Call Frame Information from .debug_frame */
> Dwarf_CFI *cfi_dbg;
> Dwarf_Op *fb_ops; /* Frame base attribute */
> - unsigned int machine; /* Target machine arch */
> + unsigned int e_machine; /* ELF target machine arch */
> + unsigned int e_flags; /* ELF target machine flags */
> struct perf_probe_arg *pvar; /* Current target variable */
> struct probe_trace_arg *tvar; /* Current result variable */
> bool skip_empty_arg; /* Skip non-exist args */
> --
> 2.47.0.rc0.187.ge670bccf7e-goog
>
--
Masami Hiramatsu (Google) <mhiramat@...nel.org>
Powered by blists - more mailing lists