7639b80540
We need dump task->stack in kernel module for debug usage, use try_get_task_stack to lock task->stack, and should call put_task_stack to release. Effective ABI change: type 'enum android_debug_symbol' changed enumerator 'ADS_PUT_TASK_STACK' (21) was added enumerator 'ADS_END' value changed from 21 to 22 Bug: 242968855 Change-Id: I57e53d3ce49ef106eca7914b470c14d50316d2ab Signed-off-by: Chunhui Li <chunhui.li@mediatek.com> Signed-off-by: Matthias Maennich <maennich@google.com>
150 lines
4.1 KiB
C
150 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
|
|
/*
|
|
* Copyright (c) 2021, The Linux Foundation. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/android_debug_symbols.h>
|
|
#include <asm/stacktrace.h>
|
|
#include <asm/sections.h>
|
|
|
|
#include <linux/cma.h>
|
|
#include "../../mm/slab.h"
|
|
#include <linux/memblock.h>
|
|
#include <linux/page_owner.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/security.h>
|
|
|
|
struct ads_entry {
|
|
char *name;
|
|
void *addr;
|
|
};
|
|
|
|
bool ads_page_owner;
|
|
bool ads_slub_debug;
|
|
unsigned long ads_vmalloc_nr_pages;
|
|
unsigned long ads_pcpu_nr_pages;
|
|
|
|
#define _ADS_ENTRY(index, symbol) \
|
|
[index] = { .name = #symbol, .addr = (void *)symbol }
|
|
#define ADS_ENTRY(index, symbol) _ADS_ENTRY(index, symbol)
|
|
|
|
#define _ADS_PER_CPU_ENTRY(index, symbol) \
|
|
[index] = { .name = #symbol, .addr = (void *)&symbol }
|
|
#define ADS_PER_CPU_ENTRY(index, symbol) _ADS_PER_CPU_ENTRY(index, symbol)
|
|
|
|
/*
|
|
* This module maintains static array of symbol and address information.
|
|
* Add all required core kernel symbols and their addresses into ads_entries[] array,
|
|
* so that vendor modules can query and to find address of non-exported symbol.
|
|
*/
|
|
static const struct ads_entry ads_entries[ADS_END] = {
|
|
ADS_ENTRY(ADS_SDATA, _sdata),
|
|
ADS_ENTRY(ADS_BSS_END, __bss_stop),
|
|
ADS_ENTRY(ADS_PER_CPU_START, __per_cpu_start),
|
|
ADS_ENTRY(ADS_PER_CPU_END, __per_cpu_end),
|
|
ADS_ENTRY(ADS_START_RO_AFTER_INIT, __start_ro_after_init),
|
|
ADS_ENTRY(ADS_END_RO_AFTER_INIT, __end_ro_after_init),
|
|
ADS_ENTRY(ADS_LINUX_BANNER, linux_banner),
|
|
#ifdef CONFIG_CMA
|
|
ADS_ENTRY(ADS_TOTAL_CMA, &totalcma_pages),
|
|
#endif
|
|
ADS_ENTRY(ADS_SLAB_CACHES, &slab_caches),
|
|
ADS_ENTRY(ADS_SLAB_MUTEX, &slab_mutex),
|
|
ADS_ENTRY(ADS_MIN_LOW_PFN, &min_low_pfn),
|
|
ADS_ENTRY(ADS_MAX_PFN, &max_pfn),
|
|
ADS_ENTRY(ADS_VMALLOC_NR_PAGES, &ads_vmalloc_nr_pages),
|
|
ADS_ENTRY(ADS_PCPU_NR_PAGES, &ads_pcpu_nr_pages),
|
|
#ifdef CONFIG_PAGE_OWNER
|
|
ADS_ENTRY(ADS_PAGE_OWNER_ENABLED, &ads_page_owner),
|
|
#endif
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
ADS_ENTRY(ADS_SLUB_DEBUG, &ads_slub_debug),
|
|
#endif
|
|
#ifdef CONFIG_SWAP
|
|
ADS_ENTRY(ADS_NR_SWAP_PAGES, &nr_swap_pages),
|
|
#endif
|
|
#ifdef CONFIG_MMU
|
|
ADS_ENTRY(ADS_MMAP_MIN_ADDR, &mmap_min_addr),
|
|
#endif
|
|
ADS_ENTRY(ADS_STACK_GUARD_GAP, &stack_guard_gap),
|
|
#ifdef CONFIG_SYSCTL
|
|
ADS_ENTRY(ADS_SYSCTL_LEGACY_VA_LAYOUT, &sysctl_legacy_va_layout),
|
|
#endif
|
|
ADS_ENTRY(ADS_SHOW_MEM, show_mem),
|
|
#ifdef CONFIG_ARM64
|
|
ADS_ENTRY(ADS_PUT_TASK_STACK, put_task_stack),
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* ads_per_cpu_entries array contains all the per_cpu variable address information.
|
|
*/
|
|
static const struct ads_entry ads_per_cpu_entries[ADS_DEBUG_PER_CPU_END] = {
|
|
#ifdef CONFIG_ARM64
|
|
ADS_PER_CPU_ENTRY(ADS_IRQ_STACK_PTR, irq_stack_ptr),
|
|
#endif
|
|
#ifdef CONFIG_X86
|
|
ADS_PER_CPU_ENTRY(ADS_IRQ_STACK_PTR, hardirq_stack_ptr),
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* android_debug_symbol - Provide address inforamtion of debug symbol.
|
|
* @symbol: Index of debug symbol array.
|
|
*
|
|
* Return address of core kernel symbol on success and a negative errno will be
|
|
* returned in error cases.
|
|
*
|
|
*/
|
|
void *android_debug_symbol(enum android_debug_symbol symbol)
|
|
{
|
|
if (symbol >= ADS_END)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return ads_entries[symbol].addr;
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(android_debug_symbol, MINIDUMP);
|
|
|
|
/*
|
|
* android_debug_per_cpu_symbol - Provide address inforamtion of per cpu debug symbol.
|
|
* @symbol: Index of per cpu debug symbol array.
|
|
*
|
|
* Return address of core kernel symbol on success and a negative errno will be
|
|
* returned in error cases.
|
|
*
|
|
*/
|
|
void *android_debug_per_cpu_symbol(enum android_debug_per_cpu_symbol symbol)
|
|
{
|
|
if (symbol >= ADS_DEBUG_PER_CPU_END)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return ads_per_cpu_entries[symbol].addr;
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(android_debug_per_cpu_symbol, MINIDUMP);
|
|
|
|
static int __init debug_symbol_init(void)
|
|
{
|
|
#ifdef CONFIG_PAGE_OWNER
|
|
ads_page_owner = page_owner_ops.need();
|
|
#endif
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
ads_slub_debug = __slub_debug_enabled();
|
|
#endif
|
|
ads_vmalloc_nr_pages = vmalloc_nr_pages();
|
|
ads_pcpu_nr_pages = pcpu_nr_pages();
|
|
return 0;
|
|
}
|
|
module_init(debug_symbol_init);
|
|
|
|
static void __exit debug_symbol_exit(void)
|
|
{ }
|
|
module_exit(debug_symbol_exit);
|
|
|
|
MODULE_DESCRIPTION("Debug Symbol Driver");
|
|
MODULE_LICENSE("GPL v2");
|