From 0e1b240a4b17484d7d5733f33a9f83980a6988a0 Mon Sep 17 00:00:00 2001 From: Kuan-Ying Lee Date: Tue, 8 Aug 2023 16:30:15 +0800 Subject: scripts/gdb/stackdepot: add stackdepot support Add support for printing the backtrace of stackdepot handle. This is the preparation patch for dumping page_owner, slabtrace usage. Link: https://lkml.kernel.org/r/20230808083020.22254-6-Kuan-Ying.Lee@mediatek.com Signed-off-by: Kuan-Ying Lee Cc: AngeloGioacchino Del Regno Cc: Chinwen Chang Cc: Matthias Brugger Cc: Qun-Wei Lin Signed-off-by: Andrew Morton --- scripts/gdb/linux/constants.py.in | 1 + scripts/gdb/linux/stackdepot.py | 55 +++++++++++++++++++++++++++++++++++++++ scripts/gdb/vmlinux-gdb.py | 1 + 3 files changed, 57 insertions(+) create mode 100644 scripts/gdb/linux/stackdepot.py (limited to 'scripts') diff --git a/scripts/gdb/linux/constants.py.in b/scripts/gdb/linux/constants.py.in index 0805aeab3dcd..f33be26253d2 100644 --- a/scripts/gdb/linux/constants.py.in +++ b/scripts/gdb/linux/constants.py.in @@ -128,3 +128,4 @@ LX_CONFIG(CONFIG_VMAP_STACK) if IS_BUILTIN(CONFIG_NUMA): LX_VALUE(CONFIG_NODES_SHIFT) LX_CONFIG(CONFIG_DEBUG_VIRTUAL) +LX_CONFIG(CONFIG_STACKDEPOT) diff --git a/scripts/gdb/linux/stackdepot.py b/scripts/gdb/linux/stackdepot.py new file mode 100644 index 000000000000..047d329a6a12 --- /dev/null +++ b/scripts/gdb/linux/stackdepot.py @@ -0,0 +1,55 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Copyright (c) 2023 MediaTek Inc. +# +# Authors: +# Kuan-Ying Lee +# + +import gdb +from linux import utils, constants + +if constants.LX_CONFIG_STACKDEPOT: + stack_record_type = utils.CachedType('struct stack_record') + DEPOT_STACK_ALIGN = 4 + +def stack_depot_fetch(handle): + global DEPOT_STACK_ALIGN + global stack_record_type + + stack_depot_disabled = gdb.parse_and_eval('stack_depot_disabled') + + if stack_depot_disabled: + raise gdb.GdbError("stack_depot_disabled\n") + + handle_parts_t = gdb.lookup_type("union handle_parts") + parts = handle.cast(handle_parts_t) + offset = parts['offset'] << DEPOT_STACK_ALIGN + pool_index_cached = gdb.parse_and_eval('pool_index') + + if parts['pool_index'] > pool_index_cached: + gdb.write("pool index %d out of bounds (%d) for stack id 0x%08x\n" % (parts['pool_index'], pool_index_cached, handle)) + return gdb.Value(0), 0 + + stack_pools = gdb.parse_and_eval('stack_pools') + + try: + pool = stack_pools[parts['pool_index']] + stack = (pool + gdb.Value(offset).cast(utils.get_size_t_type())).cast(stack_record_type.get_type().pointer()) + size = int(stack['size'].cast(utils.get_ulong_type())) + return stack['entries'], size + except Exception as e: + gdb.write("%s\n" % e) + return gdb.Value(0), 0 + +def stack_depot_print(handle): + if not constants.LX_CONFIG_STACKDEPOT: + raise gdb.GdbError("CONFIG_STACKDEPOT is not enabled") + + entries, nr_entries = stack_depot_fetch(handle) + if nr_entries > 0: + for i in range(0, nr_entries): + try: + gdb.execute("x /i 0x%x" % (int(entries[i]))) + except Exception as e: + gdb.write("%s\n" % e) diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py index fd24574bcec9..24f149694b81 100644 --- a/scripts/gdb/vmlinux-gdb.py +++ b/scripts/gdb/vmlinux-gdb.py @@ -45,3 +45,4 @@ else: import linux.radixtree import linux.interrupts import linux.mm + import linux.stackdepot -- cgit v1.2.3