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Merge branch 'core-objtool-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse source 
Pull objtool updates from Ingo Molnar:
 "The main changes are to move the ORC unwind table sorting from early
  init to build-time - this speeds up booting.

  No change in functionality intended"

* 'core-objtool-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/unwind/orc: Fix !CONFIG_MODULES build warning
  x86/unwind/orc: Remove boot-time ORC unwind tables sorting
  scripts/sorttable: Implement build-time ORC unwind table sorting
  scripts/sorttable: Rename 'sortextable' to 'sorttable'
  scripts/sortextable: Refactor the do_func() function
  scripts/sortextable: Remove dead code
  scripts/sortextable: Clean up the code to meet the kernel coding style better
  scripts/sortextable: Rewrite error/success handling
This commit is contained in:
Linus Torvalds 2020-01-28 08:38:25 -08:00
commit 8b561778f2
18 changed files with 584 additions and 421 deletions
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2
arch/arc/Kconfig
View file

@ -13,7 +13,7 @@ config ARC
select ARCH_HAS_SYNC_DMA_FOR_DEVICE select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
select ARCH_32BIT_OFF_T select ARCH_32BIT_OFF_T
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select CLONE_BACKWARDS select CLONE_BACKWARDS
select COMMON_CLK select COMMON_CLK
select DMA_DIRECT_REMAP select DMA_DIRECT_REMAP

2
arch/arm/Kconfig
View file

@ -36,7 +36,7 @@ config ARM
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IPC_PARSE_VERSION
select BINFMT_FLAT_ARGVP_ENVP_ON_STACK select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
select BUILDTIME_EXTABLE_SORT if MMU select BUILDTIME_TABLE_SORT if MMU
select CLONE_BACKWARDS select CLONE_BACKWARDS
select CPU_PM if SUSPEND || CPU_IDLE select CPU_PM if SUSPEND || CPU_IDLE
select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS

2
arch/arm64/Kconfig
View file

@ -81,7 +81,7 @@ config ARM64
select ARM_GIC_V3 select ARM_GIC_V3
select ARM_GIC_V3_ITS if PCI select ARM_GIC_V3_ITS if PCI
select ARM_PSCI_FW select ARM_PSCI_FW
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select CLONE_BACKWARDS select CLONE_BACKWARDS
select COMMON_CLK select COMMON_CLK
select CPU_PM if (SUSPEND || CPU_IDLE) select CPU_PM if (SUSPEND || CPU_IDLE)

2
arch/microblaze/Kconfig
View file

@ -11,7 +11,7 @@ config MICROBLAZE
select ARCH_HAS_UNCACHED_SEGMENT if !MMU select ARCH_HAS_UNCACHED_SEGMENT if !MMU
select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select TIMER_OF select TIMER_OF
select CLONE_BACKWARDS3 select CLONE_BACKWARDS3
select COMMON_CLK select COMMON_CLK

2
arch/mips/Kconfig
View file

@ -15,7 +15,7 @@ config MIPS
select ARCH_USE_QUEUED_SPINLOCKS select ARCH_USE_QUEUED_SPINLOCKS
select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select CLONE_BACKWARDS select CLONE_BACKWARDS
select CPU_NO_EFFICIENT_FFS if (TARGET_ISA_REV < 1) select CPU_NO_EFFICIENT_FFS if (TARGET_ISA_REV < 1)
select CPU_PM if CPU_IDLE select CPU_PM if CPU_IDLE

2
arch/parisc/Kconfig
View file

@ -18,7 +18,7 @@ config PARISC
select RTC_DRV_GENERIC select RTC_DRV_GENERIC
select INIT_ALL_POSSIBLE select INIT_ALL_POSSIBLE
select BUG select BUG
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select HAVE_PCI select HAVE_PCI
select HAVE_PERF_EVENTS select HAVE_PERF_EVENTS
select HAVE_KERNEL_BZIP2 select HAVE_KERNEL_BZIP2

2
arch/powerpc/Kconfig
View file

@ -149,7 +149,7 @@ config PPC
select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_WEAK_RELEASE_ACQUIRE select ARCH_WEAK_RELEASE_ACQUIRE
select BINFMT_ELF select BINFMT_ELF
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select CLONE_BACKWARDS select CLONE_BACKWARDS
select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
select DYNAMIC_FTRACE if FUNCTION_TRACER select DYNAMIC_FTRACE if FUNCTION_TRACER

2
arch/s390/Kconfig
View file

@ -110,7 +110,7 @@ config S390
select ARCH_USE_CMPXCHG_LOCKREF select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_WANTS_DYNAMIC_TASK_STRUCT
select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select CLONE_BACKWARDS2 select CLONE_BACKWARDS2
select DYNAMIC_FTRACE if FUNCTION_TRACER select DYNAMIC_FTRACE if FUNCTION_TRACER
select GENERIC_CLOCKEVENTS select GENERIC_CLOCKEVENTS

2
arch/x86/Kconfig
View file

@ -96,7 +96,7 @@ config X86
select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_WANTS_DYNAMIC_TASK_STRUCT
select ARCH_WANT_HUGE_PMD_SHARE select ARCH_WANT_HUGE_PMD_SHARE
select ARCH_WANTS_THP_SWAP if X86_64 select ARCH_WANTS_THP_SWAP if X86_64
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select CLKEVT_I8253 select CLKEVT_I8253
select CLOCKSOURCE_VALIDATE_LAST_CYCLE select CLOCKSOURCE_VALIDATE_LAST_CYCLE
select CLOCKSOURCE_WATCHDOG select CLOCKSOURCE_WATCHDOG

11
arch/x86/kernel/unwind_orc.c
View file

@ -187,6 +187,8 @@ static struct orc_entry *orc_find(unsigned long ip)
return orc_ftrace_find(ip); return orc_ftrace_find(ip);
} }
#ifdef CONFIG_MODULES
static void orc_sort_swap(void *_a, void *_b, int size) static void orc_sort_swap(void *_a, void *_b, int size)
{ {
struct orc_entry *orc_a, *orc_b; struct orc_entry *orc_a, *orc_b;
@ -229,7 +231,6 @@ static int orc_sort_cmp(const void *_a, const void *_b)
return orc_a->sp_reg == ORC_REG_UNDEFINED && !orc_a->end ? -1 : 1; return orc_a->sp_reg == ORC_REG_UNDEFINED && !orc_a->end ? -1 : 1;
} }
#ifdef CONFIG_MODULES
void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size, void unwind_module_init(struct module *mod, void *_orc_ip, size_t orc_ip_size,
void *_orc, size_t orc_size) void *_orc, size_t orc_size)
{ {
@ -273,9 +274,11 @@ void __init unwind_init(void)
return; return;
} }
/* Sort the .orc_unwind and .orc_unwind_ip tables: */ /*
sort(__start_orc_unwind_ip, num_entries, sizeof(int), orc_sort_cmp, * Note, the orc_unwind and orc_unwind_ip tables were already
orc_sort_swap); * sorted at build time via the 'sorttable' tool.
* It's ready for binary search straight away, no need to sort it.
*/
/* Initialize the fast lookup table: */ /* Initialize the fast lookup table: */
lookup_num_blocks = orc_lookup_end - orc_lookup; lookup_num_blocks = orc_lookup_end - orc_lookup;

2
arch/xtensa/Kconfig
View file

@ -11,7 +11,7 @@ config XTENSA
select ARCH_USE_QUEUED_SPINLOCKS select ARCH_USE_QUEUED_SPINLOCKS
select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_FRAME_POINTERS
select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT select BUILDTIME_TABLE_SORT
select CLONE_BACKWARDS select CLONE_BACKWARDS
select COMMON_CLK select COMMON_CLK
select DMA_REMAP if MMU select DMA_REMAP if MMU

2
init/Kconfig
View file

@ -58,7 +58,7 @@ config CONSTRUCTORS
config IRQ_WORK config IRQ_WORK
bool bool
config BUILDTIME_EXTABLE_SORT config BUILDTIME_TABLE_SORT
bool bool
config THREAD_INFO_IN_TASK config THREAD_INFO_IN_TASK

2
scripts/.gitignore vendored
View file

@ -6,7 +6,7 @@ conmakehash
kallsyms kallsyms
unifdef unifdef
recordmcount recordmcount
sortextable sorttable
asn1_compiler asn1_compiler
extract-cert extract-cert
sign-file sign-file

13
scripts/Makefile
View file

@ -13,17 +13,26 @@ hostprogs-$(CONFIG_BUILD_BIN2C) += bin2c
hostprogs-$(CONFIG_KALLSYMS) += kallsyms hostprogs-$(CONFIG_KALLSYMS) += kallsyms
hostprogs-$(CONFIG_VT) += conmakehash hostprogs-$(CONFIG_VT) += conmakehash
hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount hostprogs-$(BUILD_C_RECORDMCOUNT) += recordmcount
hostprogs-$(CONFIG_BUILDTIME_EXTABLE_SORT) += sortextable hostprogs-$(CONFIG_BUILDTIME_TABLE_SORT) += sorttable
hostprogs-$(CONFIG_ASN1) += asn1_compiler hostprogs-$(CONFIG_ASN1) += asn1_compiler
hostprogs-$(CONFIG_MODULE_SIG_FORMAT) += sign-file hostprogs-$(CONFIG_MODULE_SIG_FORMAT) += sign-file
hostprogs-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += extract-cert hostprogs-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += extract-cert
hostprogs-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert hostprogs-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert
HOSTCFLAGS_sortextable.o = -I$(srctree)/tools/include HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include
HOSTLDLIBS_sign-file = -lcrypto HOSTLDLIBS_sign-file = -lcrypto
HOSTLDLIBS_extract-cert = -lcrypto HOSTLDLIBS_extract-cert = -lcrypto
ifdef CONFIG_UNWINDER_ORC
ifeq ($(ARCH),x86_64)
ARCH := x86
endif
HOSTCFLAGS_sorttable.o += -I$(srctree)/tools/arch/x86/include
HOSTCFLAGS_sorttable.o += -DUNWINDER_ORC_ENABLED
HOSTLDLIBS_sorttable = -lpthread
endif
always := $(hostprogs-y) $(hostprogs-m) always := $(hostprogs-y) $(hostprogs-m)
# The following hostprogs-y programs are only build on demand # The following hostprogs-y programs are only build on demand

13
scripts/link-vmlinux.sh
View file

@ -180,9 +180,9 @@ mksysmap()
${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2} ${CONFIG_SHELL} "${srctree}/scripts/mksysmap" ${1} ${2}
} }
sortextable() sorttable()
{ {
${objtree}/scripts/sortextable ${1} ${objtree}/scripts/sorttable ${1}
} }
# Delete output files in case of error # Delete output files in case of error
@ -304,9 +304,12 @@ fi
vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o} vmlinux_link vmlinux "${kallsymso}" ${btf_vmlinux_bin_o}
if [ -n "${CONFIG_BUILDTIME_EXTABLE_SORT}" ]; then if [ -n "${CONFIG_BUILDTIME_TABLE_SORT}" ]; then
info SORTEX vmlinux info SORTTAB vmlinux
sortextable vmlinux if ! sorttable vmlinux; then
echo >&2 Failed to sort kernel tables
exit 1
fi
fi fi
info SYSMAP System.map info SYSMAP System.map

209
scripts/sortextable.h
View file

@ -1,209 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* sortextable.h
*
* Copyright 2011 - 2012 Cavium, Inc.
*
* Some of this code was taken out of recordmcount.h written by:
*
* Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved.
* Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
*/
#undef extable_ent_size
#undef compare_extable
#undef do_func
#undef Elf_Addr
#undef Elf_Ehdr
#undef Elf_Shdr
#undef Elf_Rel
#undef Elf_Rela
#undef Elf_Sym
#undef ELF_R_SYM
#undef Elf_r_sym
#undef ELF_R_INFO
#undef Elf_r_info
#undef ELF_ST_BIND
#undef ELF_ST_TYPE
#undef fn_ELF_R_SYM
#undef fn_ELF_R_INFO
#undef uint_t
#undef _r
#undef _w
#ifdef SORTEXTABLE_64
# define extable_ent_size 16
# define compare_extable compare_extable_64
# define do_func do64
# define Elf_Addr Elf64_Addr
# define Elf_Ehdr Elf64_Ehdr
# define Elf_Shdr Elf64_Shdr
# define Elf_Rel Elf64_Rel
# define Elf_Rela Elf64_Rela
# define Elf_Sym Elf64_Sym
# define ELF_R_SYM ELF64_R_SYM
# define Elf_r_sym Elf64_r_sym
# define ELF_R_INFO ELF64_R_INFO
# define Elf_r_info Elf64_r_info
# define ELF_ST_BIND ELF64_ST_BIND
# define ELF_ST_TYPE ELF64_ST_TYPE
# define fn_ELF_R_SYM fn_ELF64_R_SYM
# define fn_ELF_R_INFO fn_ELF64_R_INFO
# define uint_t uint64_t
# define _r r8
# define _w w8
#else
# define extable_ent_size 8
# define compare_extable compare_extable_32
# define do_func do32
# define Elf_Addr Elf32_Addr
# define Elf_Ehdr Elf32_Ehdr
# define Elf_Shdr Elf32_Shdr
# define Elf_Rel Elf32_Rel
# define Elf_Rela Elf32_Rela
# define Elf_Sym Elf32_Sym
# define ELF_R_SYM ELF32_R_SYM
# define Elf_r_sym Elf32_r_sym
# define ELF_R_INFO ELF32_R_INFO
# define Elf_r_info Elf32_r_info
# define ELF_ST_BIND ELF32_ST_BIND
# define ELF_ST_TYPE ELF32_ST_TYPE
# define fn_ELF_R_SYM fn_ELF32_R_SYM
# define fn_ELF_R_INFO fn_ELF32_R_INFO
# define uint_t uint32_t
# define _r r
# define _w w
#endif
static int compare_extable(const void *a, const void *b)
{
Elf_Addr av = _r(a);
Elf_Addr bv = _r(b);
if (av < bv)
return -1;
if (av > bv)
return 1;
return 0;
}
static void
do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort)
{
Elf_Shdr *shdr;
Elf_Shdr *shstrtab_sec;
Elf_Shdr *strtab_sec = NULL;
Elf_Shdr *symtab_sec = NULL;
Elf_Shdr *extab_sec = NULL;
Elf_Sym *sym;
const Elf_Sym *symtab;
Elf32_Word *symtab_shndx_start = NULL;
Elf_Sym *sort_needed_sym;
Elf_Shdr *sort_needed_sec;
Elf_Rel *relocs = NULL;
int relocs_size = 0;
uint32_t *sort_done_location;
const char *secstrtab;
const char *strtab;
char *extab_image;
int extab_index = 0;
int i;
int idx;
unsigned int num_sections;
unsigned int secindex_strings;
shdr = (Elf_Shdr *)((char *)ehdr + _r(&ehdr->e_shoff));
num_sections = r2(&ehdr->e_shnum);
if (num_sections == SHN_UNDEF)
num_sections = _r(&shdr[0].sh_size);
secindex_strings = r2(&ehdr->e_shstrndx);
if (secindex_strings == SHN_XINDEX)
secindex_strings = r(&shdr[0].sh_link);
shstrtab_sec = shdr + secindex_strings;
secstrtab = (const char *)ehdr + _r(&shstrtab_sec->sh_offset);
for (i = 0; i < num_sections; i++) {
idx = r(&shdr[i].sh_name);
if (strcmp(secstrtab + idx, "__ex_table") == 0) {
extab_sec = shdr + i;
extab_index = i;
}
if ((r(&shdr[i].sh_type) == SHT_REL ||
r(&shdr[i].sh_type) == SHT_RELA) &&
r(&shdr[i].sh_info) == extab_index) {
relocs = (void *)ehdr + _r(&shdr[i].sh_offset);
relocs_size = _r(&shdr[i].sh_size);
}
if (strcmp(secstrtab + idx, ".symtab") == 0)
symtab_sec = shdr + i;
if (strcmp(secstrtab + idx, ".strtab") == 0)
strtab_sec = shdr + i;
if (r(&shdr[i].sh_type) == SHT_SYMTAB_SHNDX)
symtab_shndx_start = (Elf32_Word *)(
(const char *)ehdr + _r(&shdr[i].sh_offset));
}
if (strtab_sec == NULL) {
fprintf(stderr, "no .strtab in file: %s\n", fname);
fail_file();
}
if (symtab_sec == NULL) {
fprintf(stderr, "no .symtab in file: %s\n", fname);
fail_file();
}
symtab = (const Elf_Sym *)((const char *)ehdr +
_r(&symtab_sec->sh_offset));
if (extab_sec == NULL) {
fprintf(stderr, "no __ex_table in file: %s\n", fname);
fail_file();
}
strtab = (const char *)ehdr + _r(&strtab_sec->sh_offset);
extab_image = (void *)ehdr + _r(&extab_sec->sh_offset);
if (custom_sort) {
custom_sort(extab_image, _r(&extab_sec->sh_size));
} else {
int num_entries = _r(&extab_sec->sh_size) / extable_ent_size;
qsort(extab_image, num_entries,
extable_ent_size, compare_extable);
}
/* If there were relocations, we no longer need them. */
if (relocs)
memset(relocs, 0, relocs_size);
/* find main_extable_sort_needed */
sort_needed_sym = NULL;
for (i = 0; i < _r(&symtab_sec->sh_size) / sizeof(Elf_Sym); i++) {
sym = (void *)ehdr + _r(&symtab_sec->sh_offset);
sym += i;
if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
continue;
idx = r(&sym->st_name);
if (strcmp(strtab + idx, "main_extable_sort_needed") == 0) {
sort_needed_sym = sym;
break;
}
}
if (sort_needed_sym == NULL) {
fprintf(stderr,
"no main_extable_sort_needed symbol in file: %s\n",
fname);
fail_file();
}
sort_needed_sec = &shdr[get_secindex(r2(&sym->st_shndx),
sort_needed_sym - symtab,
symtab_shndx_start)];
sort_done_location = (void *)ehdr +
_r(&sort_needed_sec->sh_offset) +
_r(&sort_needed_sym->st_value) -
_r(&sort_needed_sec->sh_addr);
#if 0
printf("sort done marker at %lx\n",
(unsigned long)((char *)sort_done_location - (char *)ehdr));
#endif
/* We sorted it, clear the flag. */
w(0, sort_done_location);
}

355
scripts/sortextable.c → scripts/sorttable.c
View file

@ -1,6 +1,10 @@
// SPDX-License-Identifier: GPL-2.0-only // SPDX-License-Identifier: GPL-2.0-only
/* /*
* sortextable.c: Sort the kernel's exception table * sorttable.c: Sort the kernel's table
*
* Added ORC unwind tables sort support and other updates:
* Copyright (C) 1999-2019 Alibaba Group Holding Limited. by:
* Shile Zhang <shile.zhang@linux.alibaba.com>
* *
* Copyright 2011 - 2012 Cavium, Inc. * Copyright 2011 - 2012 Cavium, Inc.
* *
@ -9,7 +13,7 @@
* Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved. * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved.
* *
* Restructured to fit Linux format, as well as other updates: * Restructured to fit Linux format, as well as other updates:
* Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc. * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
*/ */
/* /*
@ -22,7 +26,6 @@
#include <getopt.h> #include <getopt.h>
#include <elf.h> #include <elf.h>
#include <fcntl.h> #include <fcntl.h>
#include <setjmp.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
@ -51,34 +54,13 @@
#define EM_ARCV2 195 #define EM_ARCV2 195
#endif #endif
static int fd_map; /* File descriptor for file being modified. */ static uint32_t (*r)(const uint32_t *);
static int mmap_failed; /* Boolean flag. */ static uint16_t (*r2)(const uint16_t *);
static void *ehdr_curr; /* current ElfXX_Ehdr * for resource cleanup */ static uint64_t (*r8)(const uint64_t *);
static struct stat sb; /* Remember .st_size, etc. */ static void (*w)(uint32_t, uint32_t *);
static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */ static void (*w2)(uint16_t, uint16_t *);
static void (*w8)(uint64_t, uint64_t *);
/* setjmp() return values */ typedef void (*table_sort_t)(char *, int);
enum {
SJ_SETJMP = 0, /* hardwired first return */
SJ_FAIL,
SJ_SUCCEED
};
/* Per-file resource cleanup when multiple files. */
static void
cleanup(void)
{
if (!mmap_failed)
munmap(ehdr_curr, sb.st_size);
close(fd_map);
}
static void __attribute__((noreturn))
fail_file(void)
{
cleanup();
longjmp(jmpenv, SJ_FAIL);
}
/* /*
* Get the whole file as a programming convenience in order to avoid * Get the whole file as a programming convenience in order to avoid
@ -86,87 +68,98 @@ fail_file(void)
* avoids copying unused pieces; else just read the whole file. * avoids copying unused pieces; else just read the whole file.
* Open for both read and write. * Open for both read and write.
*/ */
static void *mmap_file(char const *fname) static void *mmap_file(char const *fname, size_t *size)
{ {
void *addr; int fd;
struct stat sb;
void *addr = NULL;
fd_map = open(fname, O_RDWR); fd = open(fname, O_RDWR);
if (fd_map < 0 || fstat(fd_map, &sb) < 0) { if (fd < 0) {
perror(fname); perror(fname);
fail_file(); return NULL;
}
if (fstat(fd, &sb) < 0) {
perror(fname);
goto out;
} }
if (!S_ISREG(sb.st_mode)) { if (!S_ISREG(sb.st_mode)) {
fprintf(stderr, "not a regular file: %s\n", fname); fprintf(stderr, "not a regular file: %s\n", fname);
fail_file(); goto out;
} }
addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_SHARED,
fd_map, 0); addr = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if (addr == MAP_FAILED) { if (addr == MAP_FAILED) {
mmap_failed = 1;
fprintf(stderr, "Could not mmap file: %s\n", fname); fprintf(stderr, "Could not mmap file: %s\n", fname);
fail_file(); goto out;
} }
*size = sb.st_size;
out:
close(fd);
return addr; return addr;
} }
static uint32_t rbe(const uint32_t *x)
{
return get_unaligned_be32(x);
}
static uint16_t r2be(const uint16_t *x)
{
return get_unaligned_be16(x);
}
static uint64_t r8be(const uint64_t *x) static uint64_t r8be(const uint64_t *x)
{ {
return get_unaligned_be64(x); return get_unaligned_be64(x);
} }
static uint32_t rbe(const uint32_t *x)
{
return get_unaligned_be32(x);
}
static uint16_t r2be(const uint16_t *x)
{
return get_unaligned_be16(x);
}
static uint64_t r8le(const uint64_t *x)
{
return get_unaligned_le64(x);
}
static uint32_t rle(const uint32_t *x) static uint32_t rle(const uint32_t *x)
{ {
return get_unaligned_le32(x); return get_unaligned_le32(x);
} }
static uint16_t r2le(const uint16_t *x) static uint16_t r2le(const uint16_t *x)
{ {
return get_unaligned_le16(x); return get_unaligned_le16(x);
} }
static uint64_t r8le(const uint64_t *x)
{
return get_unaligned_le64(x);
}
static void wbe(uint32_t val, uint32_t *x)
{
put_unaligned_be32(val, x);
}
static void w2be(uint16_t val, uint16_t *x)
{
put_unaligned_be16(val, x);
}
static void w8be(uint64_t val, uint64_t *x) static void w8be(uint64_t val, uint64_t *x)
{ {
put_unaligned_be64(val, x); put_unaligned_be64(val, x);
} }
static void wbe(uint32_t val, uint32_t *x)
{
put_unaligned_be32(val, x);
}
static void w2be(uint16_t val, uint16_t *x)
{
put_unaligned_be16(val, x);
}
static void w8le(uint64_t val, uint64_t *x)
{
put_unaligned_le64(val, x);
}
static void wle(uint32_t val, uint32_t *x) static void wle(uint32_t val, uint32_t *x)
{ {
put_unaligned_le32(val, x); put_unaligned_le32(val, x);
} }
static void w2le(uint16_t val, uint16_t *x) static void w2le(uint16_t val, uint16_t *x)
{ {
put_unaligned_le16(val, x); put_unaligned_le16(val, x);
} }
static uint64_t (*r8)(const uint64_t *); static void w8le(uint64_t val, uint64_t *x)
static uint32_t (*r)(const uint32_t *); {
static uint16_t (*r2)(const uint16_t *); put_unaligned_le64(val, x);
static void (*w8)(uint64_t, uint64_t *); }
static void (*w)(uint32_t, uint32_t *);
static void (*w2)(uint16_t, uint16_t *);
typedef void (*table_sort_t)(char *, int);
/* /*
* Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of * Move reserved section indices SHN_LORESERVE..SHN_HIRESERVE out of
@ -193,9 +186,9 @@ static inline unsigned int get_secindex(unsigned int shndx,
} }
/* 32 bit and 64 bit are very similar */ /* 32 bit and 64 bit are very similar */
#include "sortextable.h" #include "sorttable.h"
#define SORTEXTABLE_64 #define SORTTABLE_64
#include "sortextable.h" #include "sorttable.h"
static int compare_relative_table(const void *a, const void *b) static int compare_relative_table(const void *a, const void *b)
{ {
@ -209,11 +202,35 @@ static int compare_relative_table(const void *a, const void *b)
return 0; return 0;
} }
static void sort_relative_table(char *extab_image, int image_size)
{
int i = 0;
/*
* Do the same thing the runtime sort does, first normalize to
* being relative to the start of the section.
*/
while (i < image_size) {
uint32_t *loc = (uint32_t *)(extab_image + i);
w(r(loc) + i, loc);
i += 4;
}
qsort(extab_image, image_size / 8, 8, compare_relative_table);
/* Now denormalize. */
i = 0;
while (i < image_size) {
uint32_t *loc = (uint32_t *)(extab_image + i);
w(r(loc) - i, loc);
i += 4;
}
}
static void x86_sort_relative_table(char *extab_image, int image_size) static void x86_sort_relative_table(char *extab_image, int image_size)
{ {
int i; int i = 0;
i = 0;
while (i < image_size) { while (i < image_size) {
uint32_t *loc = (uint32_t *)(extab_image + i); uint32_t *loc = (uint32_t *)(extab_image + i);
@ -238,81 +255,47 @@ static void x86_sort_relative_table(char *extab_image, int image_size)
} }
} }
static void sort_relative_table(char *extab_image, int image_size) static int do_file(char const *const fname, void *addr)
{ {
int i; int rc = -1;
Elf32_Ehdr *ehdr = addr;
table_sort_t custom_sort = NULL;
/*
* Do the same thing the runtime sort does, first normalize to
* being relative to the start of the section.
*/
i = 0;
while (i < image_size) {
uint32_t *loc = (uint32_t *)(extab_image + i);
w(r(loc) + i, loc);
i += 4;
}
qsort(extab_image, image_size / 8, 8, compare_relative_table);
/* Now denormalize. */
i = 0;
while (i < image_size) {
uint32_t *loc = (uint32_t *)(extab_image + i);
w(r(loc) - i, loc);
i += 4;
}
}
static void
do_file(char const *const fname)
{
table_sort_t custom_sort;
Elf32_Ehdr *ehdr = mmap_file(fname);
ehdr_curr = ehdr;
switch (ehdr->e_ident[EI_DATA]) { switch (ehdr->e_ident[EI_DATA]) {
case ELFDATA2LSB:
r = rle;
r2 = r2le;
r8 = r8le;
w = wle;
w2 = w2le;
w8 = w8le;
break;
case ELFDATA2MSB:
r = rbe;
r2 = r2be;
r8 = r8be;
w = wbe;
w2 = w2be;
w8 = w8be;
break;
default: default:
fprintf(stderr, "unrecognized ELF data encoding %d: %s\n", fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
ehdr->e_ident[EI_DATA], fname); ehdr->e_ident[EI_DATA], fname);
fail_file(); return -1;
break; }
case ELFDATA2LSB:
r = rle; if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 ||
r2 = r2le; (r2(&ehdr->e_type) != ET_EXEC && r2(&ehdr->e_type) != ET_DYN) ||
r8 = r8le; ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
w = wle; fprintf(stderr, "unrecognized ET_EXEC/ET_DYN file %s\n", fname);
w2 = w2le; return -1;
w8 = w8le;
break;
case ELFDATA2MSB:
r = rbe;
r2 = r2be;
r8 = r8be;
w = wbe;
w2 = w2be;
w8 = w8be;
break;
} /* end switch */
if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0
|| (r2(&ehdr->e_type) != ET_EXEC && r2(&ehdr->e_type) != ET_DYN)
|| ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
fprintf(stderr, "unrecognized ET_EXEC/ET_DYN file %s\n", fname);
fail_file();
} }
custom_sort = NULL;
switch (r2(&ehdr->e_machine)) { switch (r2(&ehdr->e_machine)) {
default:
fprintf(stderr, "unrecognized e_machine %d %s\n",
r2(&ehdr->e_machine), fname);
fail_file();
break;
case EM_386: case EM_386:
case EM_X86_64: case EM_X86_64:
custom_sort = x86_sort_relative_table; custom_sort = x86_sort_relative_table;
break; break;
case EM_S390: case EM_S390:
case EM_AARCH64: case EM_AARCH64:
case EM_PARISC: case EM_PARISC:
@ -327,74 +310,68 @@ do_file(char const *const fname)
case EM_MIPS: case EM_MIPS:
case EM_XTENSA: case EM_XTENSA:
break; break;
} /* end switch */ default:
fprintf(stderr, "unrecognized e_machine %d %s\n",
r2(&ehdr->e_machine), fname);
return -1;
}
switch (ehdr->e_ident[EI_CLASS]) { switch (ehdr->e_ident[EI_CLASS]) {
case ELFCLASS32:
if (r2(&ehdr->e_ehsize) != sizeof(Elf32_Ehdr) ||
r2(&ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
fprintf(stderr,
"unrecognized ET_EXEC/ET_DYN file: %s\n", fname);
break;
}
rc = do_sort_32(ehdr, fname, custom_sort);
break;
case ELFCLASS64:
{
Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
if (r2(&ghdr->e_ehsize) != sizeof(Elf64_Ehdr) ||
r2(&ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
fprintf(stderr,
"unrecognized ET_EXEC/ET_DYN file: %s\n",
fname);
break;
}
rc = do_sort_64(ghdr, fname, custom_sort);
}
break;
default: default:
fprintf(stderr, "unrecognized ELF class %d %s\n", fprintf(stderr, "unrecognized ELF class %d %s\n",
ehdr->e_ident[EI_CLASS], fname); ehdr->e_ident[EI_CLASS], fname);
fail_file();
break;
case ELFCLASS32:
if (r2(&ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
|| r2(&ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
fprintf(stderr,
"unrecognized ET_EXEC/ET_DYN file: %s\n", fname);
fail_file();
}
do32(ehdr, fname, custom_sort);
break;
case ELFCLASS64: {
Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
if (r2(&ghdr->e_ehsize) != sizeof(Elf64_Ehdr)
|| r2(&ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
fprintf(stderr,
"unrecognized ET_EXEC/ET_DYN file: %s\n", fname);
fail_file();
}
do64(ghdr, fname, custom_sort);
break; break;
} }
} /* end switch */
cleanup(); return rc;
} }
int int main(int argc, char *argv[])
main(int argc, char *argv[])
{ {
int n_error = 0; /* gcc-4.3.0 false positive complaint */ int i, n_error = 0; /* gcc-4.3.0 false positive complaint */
int i; size_t size = 0;
void *addr = NULL;
if (argc < 2) { if (argc < 2) {
fprintf(stderr, "usage: sortextable vmlinux...\n"); fprintf(stderr, "usage: sorttable vmlinux...\n");
return 0; return 0;
} }
/* Process each file in turn, allowing deep failure. */ /* Process each file in turn, allowing deep failure. */
for (i = 1; i < argc; i++) { for (i = 1; i < argc; i++) {
char *file = argv[i]; addr = mmap_file(argv[i], &size);
int const sjval = setjmp(jmpenv); if (!addr) {
switch (sjval) {
default:
fprintf(stderr, "internal error: %s\n", file);
exit(1);
break;
case SJ_SETJMP: /* normal sequence */
/* Avoid problems if early cleanup() */
fd_map = -1;
ehdr_curr = NULL;
mmap_failed = 1;
do_file(file);
break;
case SJ_FAIL: /* error in do_file or below */
++n_error; ++n_error;
break; continue;
case SJ_SUCCEED: /* premature success */ }
/* do nothing */
break; if (do_file(argv[i], addr))
} /* end switch */ ++n_error;
munmap(addr, size);
} }
return !!n_error; return !!n_error;
} }

380
scripts/sorttable.h Normal file
View file

@ -0,0 +1,380 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* sorttable.h
*
* Added ORC unwind tables sort support and other updates:
* Copyright (C) 1999-2019 Alibaba Group Holding Limited. by:
* Shile Zhang <shile.zhang@linux.alibaba.com>
*
* Copyright 2011 - 2012 Cavium, Inc.
*
* Some of code was taken out of arch/x86/kernel/unwind_orc.c, written by:
* Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
*
* Some of this code was taken out of recordmcount.h written by:
*
* Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved.
* Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
*/
#undef extable_ent_size
#undef compare_extable
#undef do_sort
#undef Elf_Addr
#undef Elf_Ehdr
#undef Elf_Shdr
#undef Elf_Rel
#undef Elf_Rela
#undef Elf_Sym
#undef ELF_R_SYM
#undef Elf_r_sym
#undef ELF_R_INFO
#undef Elf_r_info
#undef ELF_ST_BIND
#undef ELF_ST_TYPE
#undef fn_ELF_R_SYM
#undef fn_ELF_R_INFO
#undef uint_t
#undef _r
#undef _w
#ifdef SORTTABLE_64
# define extable_ent_size 16
# define compare_extable compare_extable_64
# define do_sort do_sort_64
# define Elf_Addr Elf64_Addr
# define Elf_Ehdr Elf64_Ehdr
# define Elf_Shdr Elf64_Shdr
# define Elf_Rel Elf64_Rel
# define Elf_Rela Elf64_Rela
# define Elf_Sym Elf64_Sym
# define ELF_R_SYM ELF64_R_SYM
# define Elf_r_sym Elf64_r_sym
# define ELF_R_INFO ELF64_R_INFO
# define Elf_r_info Elf64_r_info
# define ELF_ST_BIND ELF64_ST_BIND
# define ELF_ST_TYPE ELF64_ST_TYPE
# define fn_ELF_R_SYM fn_ELF64_R_SYM
# define fn_ELF_R_INFO fn_ELF64_R_INFO
# define uint_t uint64_t
# define _r r8
# define _w w8
#else
# define extable_ent_size 8
# define compare_extable compare_extable_32
# define do_sort do_sort_32
# define Elf_Addr Elf32_Addr
# define Elf_Ehdr Elf32_Ehdr
# define Elf_Shdr Elf32_Shdr
# define Elf_Rel Elf32_Rel
# define Elf_Rela Elf32_Rela
# define Elf_Sym Elf32_Sym
# define ELF_R_SYM ELF32_R_SYM
# define Elf_r_sym Elf32_r_sym
# define ELF_R_INFO ELF32_R_INFO
# define Elf_r_info Elf32_r_info
# define ELF_ST_BIND ELF32_ST_BIND
# define ELF_ST_TYPE ELF32_ST_TYPE
# define fn_ELF_R_SYM fn_ELF32_R_SYM
# define fn_ELF_R_INFO fn_ELF32_R_INFO
# define uint_t uint32_t
# define _r r
# define _w w
#endif
#if defined(SORTTABLE_64) && defined(UNWINDER_ORC_ENABLED)
/* ORC unwinder only support X86_64 */
#include <errno.h>
#include <pthread.h>
#include <asm/orc_types.h>
#define ERRSTR_MAXSZ 256
char g_err[ERRSTR_MAXSZ];
int *g_orc_ip_table;
struct orc_entry *g_orc_table;
pthread_t orc_sort_thread;
static inline unsigned long orc_ip(const int *ip)
{
return (unsigned long)ip + *ip;
}
static int orc_sort_cmp(const void *_a, const void *_b)
{
struct orc_entry *orc_a;
const int *a = g_orc_ip_table + *(int *)_a;
const int *b = g_orc_ip_table + *(int *)_b;
unsigned long a_val = orc_ip(a);
unsigned long b_val = orc_ip(b);
if (a_val > b_val)
return 1;
if (a_val < b_val)
return -1;
/*
* The "weak" section terminator entries need to always be on the left
* to ensure the lookup code skips them in favor of real entries.
* These terminator entries exist to handle any gaps created by
* whitelisted .o files which didn't get objtool generation.
*/
orc_a = g_orc_table + (a - g_orc_ip_table);
return orc_a->sp_reg == ORC_REG_UNDEFINED && !orc_a->end ? -1 : 1;
}
static void *sort_orctable(void *arg)
{
int i;
int *idxs = NULL;
int *tmp_orc_ip_table = NULL;
struct orc_entry *tmp_orc_table = NULL;
unsigned int *orc_ip_size = (unsigned int *)arg;
unsigned int num_entries = *orc_ip_size / sizeof(int);
unsigned int orc_size = num_entries * sizeof(struct orc_entry);
idxs = (int *)malloc(*orc_ip_size);
if (!idxs) {
snprintf(g_err, ERRSTR_MAXSZ, "malloc idxs: %s",
strerror(errno));
pthread_exit(g_err);
}
tmp_orc_ip_table = (int *)malloc(*orc_ip_size);
if (!tmp_orc_ip_table) {
snprintf(g_err, ERRSTR_MAXSZ, "malloc tmp_orc_ip_table: %s",
strerror(errno));
pthread_exit(g_err);
}
tmp_orc_table = (struct orc_entry *)malloc(orc_size);
if (!tmp_orc_table) {
snprintf(g_err, ERRSTR_MAXSZ, "malloc tmp_orc_table: %s",
strerror(errno));
pthread_exit(g_err);
}
/* initialize indices array, convert ip_table to absolute address */
for (i = 0; i < num_entries; i++) {
idxs[i] = i;
tmp_orc_ip_table[i] = g_orc_ip_table[i] + i * sizeof(int);
}
memcpy(tmp_orc_table, g_orc_table, orc_size);
qsort(idxs, num_entries, sizeof(int), orc_sort_cmp);
for (i = 0; i < num_entries; i++) {
if (idxs[i] == i)
continue;
/* convert back to relative address */
g_orc_ip_table[i] = tmp_orc_ip_table[idxs[i]] - i * sizeof(int);
g_orc_table[i] = tmp_orc_table[idxs[i]];
}
free(idxs);
free(tmp_orc_ip_table);
free(tmp_orc_table);
pthread_exit(NULL);
}
#endif
static int compare_extable(const void *a, const void *b)
{
Elf_Addr av = _r(a);
Elf_Addr bv = _r(b);
if (av < bv)
return -1;
if (av > bv)
return 1;
return 0;
}
static int do_sort(Elf_Ehdr *ehdr,
char const *const fname,
table_sort_t custom_sort)
{
int rc = -1;
Elf_Shdr *s, *shdr = (Elf_Shdr *)((char *)ehdr + _r(&ehdr->e_shoff));
Elf_Shdr *strtab_sec = NULL;
Elf_Shdr *symtab_sec = NULL;
Elf_Shdr *extab_sec = NULL;
Elf_Sym *sym;
const Elf_Sym *symtab;
Elf32_Word *symtab_shndx = NULL;
Elf_Sym *sort_needed_sym = NULL;
Elf_Shdr *sort_needed_sec;
Elf_Rel *relocs = NULL;
int relocs_size = 0;
uint32_t *sort_needed_loc;
const char *secstrings;
const char *strtab;
char *extab_image;
int extab_index = 0;
int i;
int idx;
unsigned int shnum;
unsigned int shstrndx;
#if defined(SORTTABLE_64) && defined(UNWINDER_ORC_ENABLED)
unsigned int orc_ip_size = 0;
unsigned int orc_size = 0;
unsigned int orc_num_entries = 0;
#endif
shstrndx = r2(&ehdr->e_shstrndx);
if (shstrndx == SHN_XINDEX)
shstrndx = r(&shdr[0].sh_link);
secstrings = (const char *)ehdr + _r(&shdr[shstrndx].sh_offset);
shnum = r2(&ehdr->e_shnum);
if (shnum == SHN_UNDEF)
shnum = _r(&shdr[0].sh_size);
for (i = 0, s = shdr; s < shdr + shnum; i++, s++) {
idx = r(&s->sh_name);
if (!strcmp(secstrings + idx, "__ex_table")) {
extab_sec = s;
extab_index = i;
}
if (!strcmp(secstrings + idx, ".symtab"))
symtab_sec = s;
if (!strcmp(secstrings + idx, ".strtab"))
strtab_sec = s;
if ((r(&s->sh_type) == SHT_REL ||
r(&s->sh_type) == SHT_RELA) &&
r(&s->sh_info) == extab_index) {
relocs = (void *)ehdr + _r(&s->sh_offset);
relocs_size = _r(&s->sh_size);
}
if (r(&s->sh_type) == SHT_SYMTAB_SHNDX)
symtab_shndx = (Elf32_Word *)((const char *)ehdr +
_r(&s->sh_offset));
#if defined(SORTTABLE_64) && defined(UNWINDER_ORC_ENABLED)
/* locate the ORC unwind tables */
if (!strcmp(secstrings + idx, ".orc_unwind_ip")) {
orc_ip_size = s->sh_size;
g_orc_ip_table = (int *)((void *)ehdr +
s->sh_offset);
}
if (!strcmp(secstrings + idx, ".orc_unwind")) {
orc_size = s->sh_size;
g_orc_table = (struct orc_entry *)((void *)ehdr +
s->sh_offset);
}
#endif
} /* for loop */
#if defined(SORTTABLE_64) && defined(UNWINDER_ORC_ENABLED)
if (!g_orc_ip_table || !g_orc_table) {
fprintf(stderr,
"incomplete ORC unwind tables in file: %s\n", fname);
goto out;
}
orc_num_entries = orc_ip_size / sizeof(int);
if (orc_ip_size % sizeof(int) != 0 ||
orc_size % sizeof(struct orc_entry) != 0 ||
orc_num_entries != orc_size / sizeof(struct orc_entry)) {
fprintf(stderr,
"inconsistent ORC unwind table entries in file: %s\n",
fname);
goto out;
}
/* create thread to sort ORC unwind tables concurrently */
if (pthread_create(&orc_sort_thread, NULL,
sort_orctable, &orc_ip_size)) {
fprintf(stderr,
"pthread_create orc_sort_thread failed '%s': %s\n",
strerror(errno), fname);
goto out;
}
#endif
if (!extab_sec) {
fprintf(stderr, "no __ex_table in file: %s\n", fname);
goto out;
}
if (!symtab_sec) {
fprintf(stderr, "no .symtab in file: %s\n", fname);
goto out;
}
if (!strtab_sec) {
fprintf(stderr, "no .strtab in file: %s\n", fname);
goto out;
}
extab_image = (void *)ehdr + _r(&extab_sec->sh_offset);
strtab = (const char *)ehdr + _r(&strtab_sec->sh_offset);
symtab = (const Elf_Sym *)((const char *)ehdr +
_r(&symtab_sec->sh_offset));
if (custom_sort) {
custom_sort(extab_image, _r(&extab_sec->sh_size));
} else {
int num_entries = _r(&extab_sec->sh_size) / extable_ent_size;
qsort(extab_image, num_entries,
extable_ent_size, compare_extable);
}
/* If there were relocations, we no longer need them. */
if (relocs)
memset(relocs, 0, relocs_size);
/* find the flag main_extable_sort_needed */
for (sym = (void *)ehdr + _r(&symtab_sec->sh_offset);
sym < sym + _r(&symtab_sec->sh_size) / sizeof(Elf_Sym);
sym++) {
if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT)
continue;
if (!strcmp(strtab + r(&sym->st_name),
"main_extable_sort_needed")) {
sort_needed_sym = sym;
break;
}
}
if (!sort_needed_sym) {
fprintf(stderr,
"no main_extable_sort_needed symbol in file: %s\n",
fname);
goto out;
}
sort_needed_sec = &shdr[get_secindex(r2(&sym->st_shndx),
sort_needed_sym - symtab,
symtab_shndx)];
sort_needed_loc = (void *)ehdr +
_r(&sort_needed_sec->sh_offset) +
_r(&sort_needed_sym->st_value) -
_r(&sort_needed_sec->sh_addr);
/* extable has been sorted, clear the flag */
w(0, sort_needed_loc);
rc = 0;
out:
#if defined(SORTTABLE_64) && defined(UNWINDER_ORC_ENABLED)
if (orc_sort_thread) {
void *retval = NULL;
/* wait for ORC tables sort done */
rc = pthread_join(orc_sort_thread, &retval);
if (rc)
fprintf(stderr,
"pthread_join failed '%s': %s\n",
strerror(errno), fname);
else if (retval) {
rc = -1;
fprintf(stderr,
"failed to sort ORC tables '%s': %s\n",
(char *)retval, fname);
}
}
#endif
return rc;
}