On Tue, 18 Jul 2023 18:06:36 +0200 Alessandro Carminati <alessandro.carminati@xxxxxxxxx> wrote: > Hi Steven, > > Il giorno lun 17 lug 2023 alle ore 16:52 Steven Rostedt > <rostedt@xxxxxxxxxxx> ha scritto: > > > > On Fri, 14 Jul 2023 15:03:26 +0000 > > Alessandro Carminati <alessandro.carminati@xxxxxxxxx> wrote: > > > > > It is not uncommon for drivers or modules related to similar peripherals > > > to have symbols with the exact same name. > > > While this is not a problem for the kernel's binary itself, it becomes an > > > issue when attempting to trace or probe specific functions using > > > infrastructure like ftrace or kprobe. > > > > > > The tracing subsystem relies on the `nm -n vmlinux` output, which provides > > > symbol information from the kernel's ELF binary. However, when multiple > > > symbols share the same name, the standard nm output does not differentiate > > > between them. This can lead to confusion and difficulty when trying to > > > probe the intended symbol. > > > > > > ~ # cat /proc/kallsyms | grep " name_show" > > > ffffffff8c4f76d0 t name_show > > > ffffffff8c9cccb0 t name_show > > > ffffffff8cb0ac20 t name_show > > > ffffffff8cc728c0 t name_show > > > ffffffff8ce0efd0 t name_show > > > ffffffff8ce126c0 t name_show > > > ffffffff8ce1dd20 t name_show > > > ffffffff8ce24e70 t name_show > > > ffffffff8d1104c0 t name_show > > > ffffffff8d1fe480 t name_show > > > > > > **kas_alias** addresses this challenge by extending the symbol names with > > > unique suffixes during the kernel build process. > > > The newly created aliases for these duplicated symbols are unique names > > > that can be fed to the ftracefs interface. By doing so, it enables > > > previously unreachable symbols to be probed. > > > > > > ~ # cat /proc/kallsyms | grep " name_show" > > > ffffffff974f76d0 t name_show > > > ffffffff974f76d0 t name_show__alias__6340 > > > ffffffff979cccb0 t name_show > > > ffffffff979cccb0 t name_show__alias__6341 > > > ffffffff97b0ac20 t name_show > > > ffffffff97b0ac20 t name_show__alias__6342 > > > ffffffff97c728c0 t name_show > > > ffffffff97c728c0 t name_show__alias__6343 > > > ffffffff97e0efd0 t name_show > > > ffffffff97e0efd0 t name_show__alias__6344 > > > ffffffff97e126c0 t name_show > > > ffffffff97e126c0 t name_show__alias__6345 > > > ffffffff97e1dd20 t name_show > > > ffffffff97e1dd20 t name_show__alias__6346 > > > ffffffff97e24e70 t name_show > > > ffffffff97e24e70 t name_show__alias__6347 > > > ffffffff981104c0 t name_show > > > ffffffff981104c0 t name_show__alias__6348 > > > ffffffff981fe480 t name_show > > > ffffffff981fe480 t name_show__alias__6349 > > > ~ # echo "p:kprobes/evnt1 name_show__alias__6349" \ > > > > >/sys/kernel/tracing/kprobe_events > > > ~ # cat /sys/kernel/tracing/kprobe_events > > > p:kprobes/evnt1 name_show__alias__6349 > > > > > > > Honestly, I think the "_alias_<some-random-number>" is useless. It doesn't > > give you any clue to what function you are actually attaching to. There's > > been other approaches that show module and/or file names. I know there's > > still some issues with getting those accepted, but I much rather have them > > than this! > > > > See: https://lore.kernel.org/all/20221205163157.269335-1-nick.alcock@xxxxxxxxxx/ > > > > Thanks for sharing your thoughts on the current symbol naming convention and > Nick Alcock's approach. > I see your point about "alias<some-random-number>" not providing much context > about the attached function. > However, my intention was only to create a means to probe all functions. FYI: you can use "_text+OFFSET" to probe any function by kprobe event. Actually `perf probe` already does that. > While other approaches, such as including module and file names, are more > informative, it appears that these proposals are encountering certain > challenges in gaining acceptance. Also, they do not fully address the > specific problem I wanted to tackle. > > In my upcoming proposal, I would like to maintain the conservative approach I > have followed so far while still achieving my original objective of making all > functions reachable from kprobe. > > To date, I have been working on addressing all the necessary aspects from > outside the kernel source code. Essentially, I take the output of 'nm' and > refine it to provide more meaningful information. > > I am working in a V3, I am considering using `addr2line` to > determine the origin of each symbol. Initially, I avoided it because the > configuration dependency it introduces, specifically requiring DWARF > information such as CONFIG_DEBUG_INFO_DWARF4 or > CONFIG_DEBUG_INFO_DWARF5. Yeah, addr2line will help you to find line number and filename easily. I think that is a good way to do that. > However, after reading Luis' comment suggesting the use of > 'filename + line number', I realized that relying on DWARF information might > be the only way to achieve a satisfying result. > I will try that and see if it works... unless you know it will not already :-) > > Actually, I did a fast try using DWARF and addr2line, the strategy I'd like to > use in the v3, and the output looks like this: what do you guys think? > > $ ../kas_alias/main .tmp_vmlinux.kallsyms2.syms | grep name_show > ffffffff8100e5e0 t __pfx_pmu_name_show > ffffffff8100e5f0 t pmu_name_show > ffffffff810ed8e0 t __pfx_name_show > ffffffff810ed8f0 t name_show > ffffffff810ed8f0 t name_show@_kernel_irq_irqdesc_c_232 > ffffffff810ed950 t __pfx_chip_name_show > ffffffff810ed960 t chip_name_show > ffffffff810ed960 t chip_name_show@_kernel_irq_irqdesc_c_168 > ffffffff814cae80 t __pfx_name_show > ffffffff814cae90 t name_show > ffffffff814cae90 t name_show@_drivers_pnp_card_c_186 > ffffffff816006d0 t __pfx_name_show > ffffffff816006e0 t name_show > ffffffff816006e0 t name_show@_drivers_gpu_drm_i915_gt_sysfs_engines_c_26 > ffffffff81765460 t __pfx_name_show > ffffffff81765470 t name_show > ffffffff81765470 t name_show@_drivers_base_power_wakeup_stats_c_93 > ffffffff8189b340 t __pfx_name_show > [...] Looks good to me. Thank you! > > I want to emphasize that my goal is to find a solution that satisfies everyone > involved and addresses the concerns raised. > > Bests > Alessandro > > > -- Steve > > > > > > > Changes from v1: > > > - Integrated changes requested by Masami to exclude symbols with prefixes > > > "_cfi" and "_pfx". > > > - Introduced a small framework to handle patterns that need to be excluded > > > from the alias production. > > > - Excluded other symbols using the framework. > > > - Introduced the ability to discriminate between text and data symbols. > > > - Added two new config symbols in this version: CONFIG_KALLSYMS_ALIAS_DATA, > > > which allows data for data, and CONFIG_KALLSYMS_ALIAS_DATA_ALL, which > > > excludes all filters and provides an alias for each duplicated symbol. > > > > > > https://lore.kernel.org/all/20230711151925.1092080-1-alessandro.carminati@xxxxxxxxx/ > > > > > > Signed-off-by: Alessandro Carminati (Red Hat) <alessandro.carminati@xxxxxxxxx> > > > --- > > > init/Kconfig | 36 +++++ > > > scripts/Makefile | 4 + > > > scripts/kas_alias/Makefile | 4 + > > > scripts/kas_alias/duplicates_list.c | 70 +++++++++ > > > scripts/kas_alias/duplicates_list.h | 15 ++ > > > scripts/kas_alias/item_list.c | 230 ++++++++++++++++++++++++++++ > > > scripts/kas_alias/item_list.h | 26 ++++ > > > scripts/kas_alias/kas_alias.c | 186 ++++++++++++++++++++++ > > > scripts/link-vmlinux.sh | 6 +- > > > 9 files changed, 576 insertions(+), 1 deletion(-) > > > create mode 100644 scripts/kas_alias/Makefile > > > create mode 100644 scripts/kas_alias/duplicates_list.c > > > create mode 100644 scripts/kas_alias/duplicates_list.h > > > create mode 100644 scripts/kas_alias/item_list.c > > > create mode 100644 scripts/kas_alias/item_list.h > > > create mode 100644 scripts/kas_alias/kas_alias.c > > > > > > diff --git a/init/Kconfig b/init/Kconfig > > > index f7f65af4ee12..5ae7c613cdc4 100644 > > > --- a/init/Kconfig > > > +++ b/init/Kconfig > > > @@ -1737,6 +1737,42 @@ config KALLSYMS_BASE_RELATIVE > > > time constants, and no relocation pass is required at runtime to fix > > > up the entries based on the runtime load address of the kernel. > > > > > > +config KALLSYMS_ALIAS > > > + bool "Produces alias for duplicated symbols" if EXPERT > > > + depends on KALLSYMS > > > + help > > > + It is not uncommon for drivers or modules related to similar > > > + peripherals to have symbols with the exact same name. > > > + While this is not a problem for the kernel's binary itself, it > > > + becomes an issue when attempting to trace or probe specific > > > + functions using infrastructure like ftrace or kprobe. > > > + > > > + This option addresses this challenge by extending the symbol names > > > + with unique suffixes during the kernel build process. > > > + The newly created aliases for these duplicated symbols are unique > > > + names that can be fed to the ftrace sysfs interface. By doing so, it > > > + enables previously unreachable symbols to be probed. > > > + > > > +config CONFIG_KALLSYMS_ALIAS_DATA > > > + bool "Produces alias also for data" > > > + depends on KALLSYMS_ALIAS > > > + help > > > + Sometimes it can be useful to refer to data. In live patch scenarios, > > > + you may find yourself needing to use symbols that are shared with > > > + other functions. Since symbols face the same issue as functions, this > > > + option allows you to create aliases for data as well. > > > + > > > +config CONFIG_KALLSYMS_ALIAS_DATA_ALL > > > + bool "Removes all filter when producing data alias" > > > + depends on CONFIG_KALLSYMS_ALIAS_DATA > > > + help > > > + When selecting data aliases, not all symbols are included in the set > > > + This is because many symbols are unlikely to be used. If you choose > > > + to have an alias for all data symbols, be aware that it will > > > + significantly increase the size. > > > + > > > + If unsure, say N. > > > + > > > # end of the "standard kernel features (expert users)" menu > > > > > > # syscall, maps, verifier > > > diff --git a/scripts/Makefile b/scripts/Makefile > > > index 32b6ba722728..65fafe17cfe5 100644 > > > --- a/scripts/Makefile > > > +++ b/scripts/Makefile > > > @@ -49,3 +49,7 @@ subdir-$(CONFIG_SECURITY_SELINUX) += selinux > > > > > > # Let clean descend into subdirs > > > subdir- += basic dtc gdb kconfig mod > > > + > > > +# KALLSyms alias > > > +subdir-$(CONFIG_KALLSYMS_ALIAS) += kas_alias > > > + > > > diff --git a/scripts/kas_alias/Makefile b/scripts/kas_alias/Makefile > > > new file mode 100644 > > > index 000000000000..523fa3441013 > > > --- /dev/null > > > +++ b/scripts/kas_alias/Makefile > > > @@ -0,0 +1,4 @@ > > > +# SPDX-License-Identifier: GPL-2.0 > > > +hostprogs-always-$(CONFIG_KALLSYMS_ALIAS) += kas_alias > > > + > > > +kas_alias-objs := duplicates_list.o item_list.o kas_alias.o > > > diff --git a/scripts/kas_alias/duplicates_list.c b/scripts/kas_alias/duplicates_list.c > > > new file mode 100644 > > > index 000000000000..e7a3d2917937 > > > --- /dev/null > > > +++ b/scripts/kas_alias/duplicates_list.c > > > @@ -0,0 +1,70 @@ > > > +// SPDX-License-Identifier: GPL-2.0-or-later > > > +#include <stdint.h> > > > +#include <stdio.h> > > > +#include <string.h> > > > +#include <stdlib.h> > > > +#include <stdbool.h> > > > + > > > +#include "item_list.h" > > > +#include "duplicates_list.h" > > > + > > > +struct duplicate_item *find_duplicates(struct item *list) > > > +{ > > > + struct duplicate_item *current_duplicate = NULL; > > > + struct duplicate_item *duplicates = NULL; > > > + struct duplicate_item *new_duplicate; > > > + struct item *current_item = list; > > > + bool prev_was_duplicate = false; > > > + struct item *prev_item = NULL; > > > + > > > + while (current_item) { > > > + if ((prev_item && (strcmp(current_item->symb_name, prev_item->symb_name) == 0)) || > > > + prev_was_duplicate) { > > > + if (!duplicates) { > > > + duplicates = malloc(sizeof(struct duplicate_item)); > > > + if (!duplicates) > > > + return NULL; > > > + > > > + duplicates->original_item = prev_item; > > > + duplicates->next = NULL; > > > + current_duplicate = duplicates; > > > + } else { > > > + new_duplicate = malloc(sizeof(struct duplicate_item)); > > > + if (!new_duplicate) { > > > + free_duplicates(&duplicates); > > > + return NULL; > > > + } > > > + > > > + new_duplicate->original_item = prev_item; > > > + new_duplicate->next = NULL; > > > + current_duplicate->next = new_duplicate; > > > + current_duplicate = new_duplicate; > > > + > > > + if ((strcmp(current_item->symb_name, prev_item->symb_name) != 0) && > > > + (prev_was_duplicate)) > > > + prev_was_duplicate = false; > > > + else > > > + prev_was_duplicate = true; > > > + } > > > + } > > > + > > > + prev_item = current_item; > > > + current_item = current_item->next; > > > + } > > > + > > > + return duplicates; > > > +} > > > + > > > +void free_duplicates(struct duplicate_item **duplicates) > > > +{ > > > + struct duplicate_item *duplicates_iterator = *duplicates; > > > + struct duplicate_item *app; > > > + > > > + while (duplicates_iterator) { > > > + app = duplicates_iterator; > > > + duplicates_iterator = duplicates_iterator->next; > > > + free(app); > > > + } > > > + > > > + *duplicates = NULL; > > > +} > > > diff --git a/scripts/kas_alias/duplicates_list.h b/scripts/kas_alias/duplicates_list.h > > > new file mode 100644 > > > index 000000000000..76aa73e584bc > > > --- /dev/null > > > +++ b/scripts/kas_alias/duplicates_list.h > > > @@ -0,0 +1,15 @@ > > > +/* SPDX-License-Identifier: GPL-2.0-or-later */ > > > +#ifndef DUPLICATES_LIST_H > > > +#define DUPLICATES_LIST_H > > > + > > > +#include "item_list.h" > > > + > > > +struct duplicate_item { > > > + struct item *original_item; > > > + struct duplicate_item *next; > > > +}; > > > + > > > +struct duplicate_item *find_duplicates(struct item *list); > > > +void free_duplicates(struct duplicate_item **duplicates); > > > + > > > +#endif > > > diff --git a/scripts/kas_alias/item_list.c b/scripts/kas_alias/item_list.c > > > new file mode 100644 > > > index 000000000000..7c9d5aecca9a > > > --- /dev/null > > > +++ b/scripts/kas_alias/item_list.c > > > @@ -0,0 +1,230 @@ > > > +// SPDX-License-Identifier: GPL-2.0-or-later > > > +#include <stdio.h> > > > +#include <stdlib.h> > > > +#include <stdint.h> > > > +#include <string.h> > > > +#include <stdbool.h> > > > +#include <assert.h> > > > +#include "item_list.h" > > > + > > > +#define CHECK_ORDER_BY_ADDRESS(sort_by, current, temp, op) \ > > > + ((sort_by) == BY_ADDRESS && (current)->addr op (temp)->addr) > > > +#define CHECK_ORDER_BY_NAME(sort_by, current, temp, op) \ > > > + ((sort_by) == BY_NAME && strcmp((current)->symb_name, (temp)->symb_name) op 0) > > > + > > > +struct item *list_index[96] = {0}; > > > + > > > +void build_index(struct item *list) > > > +{ > > > + char current_first_letter = ' '; > > > + struct item *current = list; > > > + > > > + while (current) { > > > + if (current->symb_name[0] != current_first_letter) { > > > + current_first_letter = current->symb_name[0]; > > > + list_index[current_first_letter - 32] = current; > > > + } > > > + current = current->next; > > > + } > > > +} > > > + > > > +struct item *add_item(struct item **list, const char *name, char stype, uint64_t addr) > > > +{ > > > + struct item *new_item; > > > + struct item *current; > > > + > > > + new_item = malloc(sizeof(struct item)); > > > + if (!new_item) > > > + return NULL; > > > + > > > + strncpy(new_item->symb_name, name, MAX_NAME_SIZE); > > > + new_item->symb_name[MAX_NAME_SIZE - 1] = '\0'; > > > + new_item->addr = addr; > > > + new_item->stype = stype; > > > + new_item->next = NULL; > > > + > > > + if (!(*list)) { > > > + *list = new_item; > > > + } else { > > > + current = *list; > > > + while (current->next) > > > + current = current->next; > > > + > > > + current->next = new_item; > > > + } > > > + return new_item; > > > +} > > > + > > > +void sort_list(struct item **list, int sort_by) > > > +{ > > > + struct item *current = *list; > > > + struct item *sorted = NULL; > > > + struct item *next_item; > > > + struct item *temp; > > > + > > > + if (!(*list) || !((*list)->next)) > > > + return; > > > + > > > + while (current) { > > > + next_item = current->next; > > > + if (!sorted || > > > + (CHECK_ORDER_BY_ADDRESS(sort_by, current, sorted, <) || > > > + CHECK_ORDER_BY_NAME(sort_by, current, sorted, >=))) { > > > + current->next = sorted; > > > + sorted = current; > > > + } else { > > > + temp = sorted; > > > + while (temp->next && > > > + (CHECK_ORDER_BY_ADDRESS(sort_by, current, temp->next, >=) || > > > + CHECK_ORDER_BY_NAME(sort_by, current, temp->next, >=))) > > > + temp = temp->next; > > > + > > > + current->next = temp->next; > > > + temp->next = current; > > > + } > > > + current = next_item; > > > + } > > > + > > > + *list = sorted; > > > +} > > > + > > > +struct item *merge(struct item *left, struct item *right, int sort_by) > > > +{ > > > + struct item *current = NULL; > > > + struct item *result = NULL; > > > + > > > + if (!left) > > > + return right; > > > + if (!right) > > > + return left; > > > + > > > + if (sort_by == BY_NAME) { > > > + if (strcmp(left->symb_name, right->symb_name) <= 0) { > > > + result = left; > > > + left = left->next; > > > + } else { > > > + result = right; > > > + right = right->next; > > > + } > > > + } else { > > > + if (sort_by == BY_ADDRESS) { > > > + if (left->addr <= right->addr) { > > > + result = left; > > > + left = left->next; > > > + } else { > > > + result = right; > > > + right = right->next; > > > + } > > > + } > > > + } > > > + > > > + current = result; > > > + > > > + while (left && right) { > > > + if (sort_by == BY_NAME) { > > > + if (strcmp(left->symb_name, right->symb_name) <= 0) { > > > + current->next = left; > > > + left = left->next; > > > + } else { > > > + current->next = right; > > > + right = right->next; > > > + } > > > + } else { > > > + if (sort_by == BY_ADDRESS) { > > > + if (left->addr <= right->addr) { > > > + current->next = left; > > > + left = left->next; > > > + } else { > > > + current->next = right; > > > + right = right->next; > > > + } > > > + } > > > + } > > > + > > > + current = current->next; > > > + } > > > + > > > + if (left) { > > > + current->next = left; > > > + } else { > > > + if (right) > > > + current->next = right; > > > + } > > > + > > > + return result; > > > +} > > > + > > > +struct item *merge_sort(struct item *head, int sort_by) > > > +{ > > > + struct item *right; > > > + struct item *slow; > > > + struct item *fast; > > > + struct item *left; > > > + > > > + if (!head || !head->next) > > > + return head; > > > + > > > + slow = head; > > > + fast = head->next; > > > + > > > + while (fast && fast->next) { > > > + slow = slow->next; > > > + fast = fast->next->next; > > > + } > > > + > > > + left = head; > > > + right = slow->next; > > > + slow->next = NULL; > > > + > > > + left = merge_sort(left, sort_by); > > > + right = merge_sort(right, sort_by); > > > + > > > + return merge(left, right, sort_by); > > > +} > > > + > > > +void sort_list_m(struct item **head, int sort_by) > > > +{ > > > + if (!(*head) || !((*head)->next)) > > > + return; > > > + > > > + *head = merge_sort(*head, sort_by); > > > +} > > > + > > > +int insert_after(struct item *list, const uint64_t search_addr, > > > + const char *name, uint64_t addr, char stype) > > > +{ > > > + struct item *new_item; > > > + struct item *current; > > > + int ret = 0; > > > + > > > + current = (list_index[name[0] - 32]) ? list_index[name[0] - 32] : list; > > > + while (current) { > > > + if (current->addr == search_addr) { > > > + new_item = malloc(sizeof(struct item)); > > > + if (!new_item) > > > + return ret; > > > + strncpy(new_item->symb_name, name, MAX_NAME_SIZE); > > > + new_item->symb_name[MAX_NAME_SIZE - 1] = '\0'; > > > + new_item->addr = addr; > > > + new_item->stype = stype; > > > + new_item->next = current->next; > > > + current->next = new_item; > > > + ret = 1; > > > + break; > > > + } > > > + current = current->next; > > > + } > > > + return ret; > > > +} > > > + > > > +void free_items(struct item **head) > > > +{ > > > + struct item *app, *item_iterator = *head; > > > + > > > + while (item_iterator) { > > > + app = item_iterator; > > > + item_iterator = item_iterator->next; > > > + free(app); > > > + } > > > + *head = NULL; > > > +} > > > diff --git a/scripts/kas_alias/item_list.h b/scripts/kas_alias/item_list.h > > > new file mode 100644 > > > index 000000000000..b4891cb088ee > > > --- /dev/null > > > +++ b/scripts/kas_alias/item_list.h > > > @@ -0,0 +1,26 @@ > > > +/* SPDX-License-Identifier: GPL-2.0-or-later */ > > > +#ifndef ITEM_LIST_H > > > +#define ITEM_LIST_H > > > +#include <stdint.h> > > > + > > > +#define MAX_NAME_SIZE 256 > > > +#define BY_ADDRESS 1 > > > +#define BY_NAME 2 > > > + > > > +struct item { > > > + char symb_name[MAX_NAME_SIZE]; > > > + uint64_t addr; > > > + char stype; > > > + struct item *next; > > > +}; > > > + > > > +void build_index(struct item *list); > > > +struct item *add_item(struct item **list, const char *name, char stype, uint64_t addr); > > > +void sort_list(struct item **list, int sort_by); > > > +struct item *merge(struct item *left, struct item *right, int sort_by); > > > +struct item *merge_sort(struct item *head, int sort_by); > > > +void sort_list_m(struct item **head, int sort_by); > > > +int insert_after(struct item *list, const uint64_t search_addr, > > > + const char *name, uint64_t addr, char stype); > > > +void free_items(struct item **head); > > > +#endif > > > diff --git a/scripts/kas_alias/kas_alias.c b/scripts/kas_alias/kas_alias.c > > > new file mode 100644 > > > index 000000000000..eb873b368023 > > > --- /dev/null > > > +++ b/scripts/kas_alias/kas_alias.c > > > @@ -0,0 +1,186 @@ > > > +// SPDX-License-Identifier: GPL-2.0-or-later > > > +#include <stdio.h> > > > +#include <stdlib.h> > > > +#include <stdint.h> > > > +#include <string.h> > > > +#include <stdbool.h> > > > +#include <stdarg.h> > > > +#include <regex.h> > > > + > > > +#include "item_list.h" > > > +#include "duplicates_list.h" > > > + > > > +#define SYMB_IS_TEXT(s) ((((s)->stype) == 't') || (((s)->stype) == 'T')) > > > +#define SYMB_IS_DATA(s) ((((s)->stype) == 'b') || (((s)->stype) == 'B') || \ > > > + (((s)->stype) == 'd') || (((s)->stype) == 'D') || \ > > > + (((s)->stype) == 'r') || (((s)->stype) == 'R')) > > > +#ifdef CONFIG_KALLSYMS_ALIAS_DATA > > > +#define SYMB_NEEDS_ALIAS(s) (SYMB_IS_TEXT(s) || SYMB_IS_DATA(s)) > > > +#else > > > +#define SYMB_NEEDS_ALIAS(s) SYMB_IS_TEXT(s) > > > +#endif > > > +#define FNOMATCH 0 > > > +#define FMATCH 1 > > > +#define EREGEX 2 > > > + > > > +const char *ignore_regex[] = { > > > + "^__cfi_.*$", // __cfi_ preamble > > > +#ifndef CONFIG_KALLSYMS_ALIAS_DATA_ALL > > > + "^_*TRACE_SYSTEM.*$", > > > + "^__already_done\\.[0-9]+$", // Call a function once data > > > + "^___tp_str\\.[0-9]+$", > > > + "^___done\\.[0-9]+$", > > > + "^__print_once\\.[0-9]+$", > > > + "^_rs\\.[0-9]+$", > > > + "^__compound_literal\\.[0-9]+$", > > > + "^___once_key\\.[0-9]+$", > > > + "^__func__\\.[0-9]+$", > > > + "^__msg\\.[0-9]+$", > > > + "^CSWTCH\\.[0-9]+$", > > > + "^__flags\\.[0-9]+$", > > > + "^__wkey.*$", > > > + "^__mkey.*$", > > > + "^__key.*$", > > > +#endif > > > + "^__pfx_.*$" // NOP-padding > > > +}; > > > + > > > +int suffix_serial; > > > + > > > +static inline void verbose_msg(bool verbose, const char *fmt, ...) > > > +{ > > > + va_list args; > > > + > > > + va_start(args, fmt); > > > + if (verbose) > > > + printf(fmt, args); > > > + > > > + va_end(args); > > > +} > > > + > > > +static void create_suffix(const char *name, char *output_suffix) > > > +{ > > > + sprintf(output_suffix, "%s__alias__%d", name, suffix_serial++); > > > +} > > > + > > > +static int filter_symbols(char *symbol, const char **ignore_list, int regex_no) > > > +{ > > > + regex_t regex; > > > + int res, i; > > > + > > > + for (i = 0; i < regex_no; i++) { > > > + res = regcomp(®ex, ignore_list[i], REG_EXTENDED); > > > + if (res) > > > + return -EREGEX; > > > + > > > + res = regexec(®ex, symbol, 0, NULL, 0); > > > + regfree(®ex); > > > + switch (res) { > > > + case 0: > > > + return FMATCH; > > > + case REG_NOMATCH: > > > + break; > > > + default: > > > + return -EREGEX; > > > + } > > > + > > > + } > > > + > > > + return FNOMATCH; > > > +} > > > + > > > +int main(int argc, char *argv[]) > > > +{ > > > + char t, sym_name[MAX_NAME_SIZE], new_name[MAX_NAME_SIZE + 15]; > > > + struct duplicate_item *duplicate_iterator; > > > + struct duplicate_item *duplicate; > > > + struct item *head = {NULL}; > > > + bool need_2_process = true; > > > + struct item *last = {NULL}; > > > + struct item *current; > > > + int verbose_mode = 0; > > > + uint64_t address; > > > + FILE *fp; > > > + int res; > > > + > > > + if (argc < 2 || argc > 3) { > > > + printf("Usage: %s <nmfile> [-verbose]\n", argv[0]); > > > + return 1; > > > + } > > > + > > > + if (argc == 3 && strcmp(argv[2], "-verbose") == 0) > > > + verbose_mode = 1; > > > + > > > + verbose_msg(verbose_mode, "Scanning nm data(%s)\n", argv[1]); > > > + > > > + fp = fopen(argv[1], "r"); > > > + if (!fp) { > > > + printf("Can't open input file.\n"); > > > + return 1; > > > + } > > > + > > > + while (fscanf(fp, "%lx %c %99s\n", &address, &t, sym_name) == 3) { > > > + if (strstr(sym_name, "__alias__1") != NULL) { > > > + if (verbose_mode && need_2_process) > > > + printf("Already processed\n"); > > > + need_2_process = false; > > > + } > > > + last = add_item(&last, sym_name, t, address); > > > + if (!last) { > > > + printf("Error in allocate memory\n"); > > > + free_items(&head); > > > + return 1; > > > + } > > > + > > > + if (!head) > > > + head = last; > > > + } > > > + > > > + fclose(fp); > > > + > > > + if (need_2_process) { > > > + verbose_msg(verbose_mode, "Sorting nm data\n"); > > > + sort_list_m(&head, BY_NAME); > > > + verbose_msg(verbose_mode, "Scanning nm data for duplicates\n"); > > > + duplicate = find_duplicates(head); > > > + if (!duplicate) { > > > + printf("Error in duplicates list\n"); > > > + return 1; > > > + } > > > + > > > + verbose_msg(verbose_mode, "Applying suffixes\n"); > > > + build_index(head); > > > + duplicate_iterator = duplicate; > > > + while (duplicate_iterator) { > > > + res = filter_symbols(duplicate_iterator->original_item->symb_name, > > > + ignore_regex, sizeof(ignore_regex) / > > > + sizeof(ignore_regex[0])); > > > + if ((res != FMATCH) && > > > + SYMB_NEEDS_ALIAS(duplicate_iterator->original_item)) { > > > + if (res < 0) > > > + return 1; > > > + > > > + create_suffix(duplicate_iterator->original_item->symb_name, > > > + new_name); > > > + if (!insert_after(head, duplicate_iterator->original_item->addr, > > > + new_name, duplicate_iterator->original_item->addr, > > > + duplicate_iterator->original_item->stype)) > > > + return 1; > > > + } > > > + > > > + duplicate_iterator = duplicate_iterator->next; > > > + } > > > + > > > + sort_list_m(&head, BY_ADDRESS); > > > + } > > > + current = head; > > > + while (current) { > > > + printf("%08lx %c %s\n", current->addr, current->stype, current->symb_name); > > > + current = current->next; > > > + } > > > + > > > + free_items(&head); > > > + free_duplicates(&duplicate); > > > + > > > + return 0; > > > +} > > > diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh > > > index a432b171be82..4e3dea3ac2df 100755 > > > --- a/scripts/link-vmlinux.sh > > > +++ b/scripts/link-vmlinux.sh > > > @@ -161,7 +161,11 @@ kallsyms() > > > fi > > > > > > info KSYMS ${2} > > > - scripts/kallsyms ${kallsymopt} ${1} > ${2} > > > + if is_enabled CONFIG_KALLSYMS_ALIAS; then > > > + ALIAS=".alias" > > > + scripts/kas_alias/kas_alias ${1} >${1}${ALIAS} > > > + fi > > > + scripts/kallsyms ${kallsymopt} ${1}${ALIAS} > ${2} > > > } > > > > > > # Perform one step in kallsyms generation, including temporary linking of > > -- Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
