4e8fbc1c97
And use it in the libunwind case, with both passing a valid perf_env to extract the arch to be normalized from and passing NULL with the same semantic as in the annotate code: to get it from uname() uts.machine. Now the code to generate per arch errno translation tables (int/string) can use it to decode perf.data files recorded in a different arch than that where 'perf trace' (or any other analysis tool) runs. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Thomas Richter <tmricht@linux.vnet.ibm.com> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-p2epffgash69w38kvj3ntpc9@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "unwind.h"
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#include "thread.h"
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#include "session.h"
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#include "debug.h"
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#include "env.h"
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struct unwind_libunwind_ops __weak *local_unwind_libunwind_ops;
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struct unwind_libunwind_ops __weak *x86_32_unwind_libunwind_ops;
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struct unwind_libunwind_ops __weak *arm64_unwind_libunwind_ops;
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static void unwind__register_ops(struct thread *thread,
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struct unwind_libunwind_ops *ops)
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{
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thread->unwind_libunwind_ops = ops;
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}
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int unwind__prepare_access(struct thread *thread, struct map *map,
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bool *initialized)
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{
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const char *arch;
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enum dso_type dso_type;
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struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
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int err;
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if (thread->addr_space) {
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pr_debug("unwind: thread map already set, dso=%s\n",
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map->dso->name);
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if (initialized)
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*initialized = true;
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return 0;
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}
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/* env->arch is NULL for live-mode (i.e. perf top) */
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if (!thread->mg->machine->env || !thread->mg->machine->env->arch)
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goto out_register;
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dso_type = dso__type(map->dso, thread->mg->machine);
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if (dso_type == DSO__TYPE_UNKNOWN)
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return 0;
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arch = perf_env__arch(thread->mg->machine->env);
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if (!strcmp(arch, "x86")) {
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if (dso_type != DSO__TYPE_64BIT)
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ops = x86_32_unwind_libunwind_ops;
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} else if (!strcmp(arch, "arm64") || !strcmp(arch, "arm")) {
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if (dso_type == DSO__TYPE_64BIT)
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ops = arm64_unwind_libunwind_ops;
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}
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if (!ops) {
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pr_err("unwind: target platform=%s is not supported\n", arch);
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return 0;
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}
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out_register:
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unwind__register_ops(thread, ops);
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err = thread->unwind_libunwind_ops->prepare_access(thread);
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if (initialized)
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*initialized = err ? false : true;
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return err;
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}
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void unwind__flush_access(struct thread *thread)
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{
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if (thread->unwind_libunwind_ops)
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thread->unwind_libunwind_ops->flush_access(thread);
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}
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void unwind__finish_access(struct thread *thread)
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{
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if (thread->unwind_libunwind_ops)
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thread->unwind_libunwind_ops->finish_access(thread);
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}
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int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
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struct thread *thread,
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struct perf_sample *data, int max_stack)
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{
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if (thread->unwind_libunwind_ops)
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return thread->unwind_libunwind_ops->get_entries(cb, arg, thread, data, max_stack);
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return 0;
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}
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