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When building with -ffunction-sections, the compiler will place each function into its own ELF section, prefixed with ".text". For example, a simple test module with functions test_module_do_work() and test_module_wq_func(): % objdump --section-headers test_module.o | awk '/\.text/{print $2}' .text .text.test_module_do_work .text.test_module_wq_func .init.text .exit.text Adjust the recordmcount scripts to look for ".text" as a section name prefix. This will ensure that those functions will be included in the __mcount_loc relocations: % objdump --reloc --section __mcount_loc test_module.o OFFSET TYPE VALUE 0000000000000000 R_X86_64_64 .text.test_module_do_work 0000000000000008 R_X86_64_64 .text.test_module_wq_func 0000000000000010 R_X86_64_64 .init.text Link: http://lkml.kernel.org/r/1542745158-25392-2-git-send-email-joe.lawrence@redhat.com Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
654 lines
17 KiB
C
654 lines
17 KiB
C
/*
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* recordmcount.c: construct a table of the locations of calls to 'mcount'
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* so that ftrace can find them quickly.
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* Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved.
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* Licensed under the GNU General Public License, version 2 (GPLv2).
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*
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* Restructured to fit Linux format, as well as other updates:
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* Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
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*/
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/*
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* Strategy: alter the .o file in-place.
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*
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* Append a new STRTAB that has the new section names, followed by a new array
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* ElfXX_Shdr[] that has the new section headers, followed by the section
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* contents for __mcount_loc and its relocations. The old shstrtab strings,
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* and the old ElfXX_Shdr[] array, remain as "garbage" (commonly, a couple
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* kilobytes.) Subsequent processing by /bin/ld (or the kernel module loader)
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* will ignore the garbage regions, because they are not designated by the
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* new .e_shoff nor the new ElfXX_Shdr[]. [In order to remove the garbage,
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* then use "ld -r" to create a new file that omits the garbage.]
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <getopt.h>
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#include <elf.h>
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#include <fcntl.h>
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#include <setjmp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef EM_AARCH64
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#define EM_AARCH64 183
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#define R_AARCH64_NONE 0
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#define R_AARCH64_ABS64 257
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#endif
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static int fd_map; /* File descriptor for file being modified. */
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static int mmap_failed; /* Boolean flag. */
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static char gpfx; /* prefix for global symbol name (sometimes '_') */
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static struct stat sb; /* Remember .st_size, etc. */
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static jmp_buf jmpenv; /* setjmp/longjmp per-file error escape */
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static const char *altmcount; /* alternate mcount symbol name */
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static int warn_on_notrace_sect; /* warn when section has mcount not being recorded */
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static void *file_map; /* pointer of the mapped file */
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static void *file_end; /* pointer to the end of the mapped file */
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static int file_updated; /* flag to state file was changed */
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static void *file_ptr; /* current file pointer location */
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static void *file_append; /* added to the end of the file */
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static size_t file_append_size; /* how much is added to end of file */
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/* setjmp() return values */
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enum {
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SJ_SETJMP = 0, /* hardwired first return */
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SJ_FAIL,
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SJ_SUCCEED
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};
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/* Per-file resource cleanup when multiple files. */
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static void
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cleanup(void)
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{
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if (!mmap_failed)
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munmap(file_map, sb.st_size);
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else
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free(file_map);
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file_map = NULL;
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free(file_append);
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file_append = NULL;
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file_append_size = 0;
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file_updated = 0;
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}
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static void __attribute__((noreturn))
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fail_file(void)
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{
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cleanup();
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longjmp(jmpenv, SJ_FAIL);
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}
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static void __attribute__((noreturn))
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succeed_file(void)
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{
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cleanup();
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longjmp(jmpenv, SJ_SUCCEED);
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}
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/* ulseek, uread, ...: Check return value for errors. */
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static off_t
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ulseek(int const fd, off_t const offset, int const whence)
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{
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switch (whence) {
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case SEEK_SET:
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file_ptr = file_map + offset;
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break;
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case SEEK_CUR:
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file_ptr += offset;
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break;
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case SEEK_END:
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file_ptr = file_map + (sb.st_size - offset);
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break;
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}
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if (file_ptr < file_map) {
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fprintf(stderr, "lseek: seek before file\n");
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fail_file();
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}
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return file_ptr - file_map;
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}
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static size_t
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uread(int const fd, void *const buf, size_t const count)
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{
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size_t const n = read(fd, buf, count);
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if (n != count) {
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perror("read");
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fail_file();
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}
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return n;
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}
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static size_t
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uwrite(int const fd, void const *const buf, size_t const count)
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{
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size_t cnt = count;
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off_t idx = 0;
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file_updated = 1;
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if (file_ptr + count >= file_end) {
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off_t aoffset = (file_ptr + count) - file_end;
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if (aoffset > file_append_size) {
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file_append = realloc(file_append, aoffset);
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file_append_size = aoffset;
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}
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if (!file_append) {
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perror("write");
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fail_file();
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}
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if (file_ptr < file_end) {
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cnt = file_end - file_ptr;
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} else {
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cnt = 0;
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idx = aoffset - count;
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}
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}
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if (cnt)
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memcpy(file_ptr, buf, cnt);
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if (cnt < count)
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memcpy(file_append + idx, buf + cnt, count - cnt);
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file_ptr += count;
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return count;
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}
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static void *
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umalloc(size_t size)
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{
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void *const addr = malloc(size);
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if (addr == 0) {
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fprintf(stderr, "malloc failed: %zu bytes\n", size);
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fail_file();
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}
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return addr;
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}
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static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 };
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static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 };
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static unsigned char *ideal_nop;
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static char rel_type_nop;
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static int (*make_nop)(void *map, size_t const offset);
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static int make_nop_x86(void *map, size_t const offset)
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{
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uint32_t *ptr;
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unsigned char *op;
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/* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */
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ptr = map + offset;
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if (*ptr != 0)
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return -1;
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op = map + offset - 1;
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if (*op != 0xe8)
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return -1;
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/* convert to nop */
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ulseek(fd_map, offset - 1, SEEK_SET);
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uwrite(fd_map, ideal_nop, 5);
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return 0;
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}
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static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */
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static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */
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static unsigned char *ideal_nop4_arm;
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static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */
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static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */
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static unsigned char *bl_mcount_arm;
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static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */
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static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */
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static unsigned char *push_arm;
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static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */
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static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */
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static unsigned char *ideal_nop2_thumb;
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static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */
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static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */
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static unsigned char *push_bl_mcount_thumb;
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static int make_nop_arm(void *map, size_t const offset)
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{
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char *ptr;
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int cnt = 1;
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int nop_size;
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size_t off = offset;
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ptr = map + offset;
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if (memcmp(ptr, bl_mcount_arm, 4) == 0) {
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if (memcmp(ptr - 4, push_arm, 4) == 0) {
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off -= 4;
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cnt = 2;
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}
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ideal_nop = ideal_nop4_arm;
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nop_size = 4;
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} else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) {
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cnt = 3;
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nop_size = 2;
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off -= 2;
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ideal_nop = ideal_nop2_thumb;
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} else
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return -1;
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/* Convert to nop */
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ulseek(fd_map, off, SEEK_SET);
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do {
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uwrite(fd_map, ideal_nop, nop_size);
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} while (--cnt > 0);
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return 0;
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}
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static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5};
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static int make_nop_arm64(void *map, size_t const offset)
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{
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uint32_t *ptr;
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ptr = map + offset;
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/* bl <_mcount> is 0x94000000 before relocation */
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if (*ptr != 0x94000000)
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return -1;
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/* Convert to nop */
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ulseek(fd_map, offset, SEEK_SET);
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uwrite(fd_map, ideal_nop, 4);
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return 0;
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}
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/*
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* Get the whole file as a programming convenience in order to avoid
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* malloc+lseek+read+free of many pieces. If successful, then mmap
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* avoids copying unused pieces; else just read the whole file.
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* Open for both read and write; new info will be appended to the file.
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* Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr
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* do not propagate to the file until an explicit overwrite at the last.
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* This preserves most aspects of consistency (all except .st_size)
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* for simultaneous readers of the file while we are appending to it.
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* However, multiple writers still are bad. We choose not to use
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* locking because it is expensive and the use case of kernel build
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* makes multiple writers unlikely.
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*/
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static void *mmap_file(char const *fname)
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{
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fd_map = open(fname, O_RDONLY);
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if (fd_map < 0 || fstat(fd_map, &sb) < 0) {
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perror(fname);
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fail_file();
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}
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if (!S_ISREG(sb.st_mode)) {
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fprintf(stderr, "not a regular file: %s\n", fname);
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fail_file();
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}
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file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE,
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fd_map, 0);
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mmap_failed = 0;
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if (file_map == MAP_FAILED) {
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mmap_failed = 1;
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file_map = umalloc(sb.st_size);
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uread(fd_map, file_map, sb.st_size);
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}
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close(fd_map);
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file_end = file_map + sb.st_size;
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return file_map;
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}
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static void write_file(const char *fname)
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{
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char tmp_file[strlen(fname) + 4];
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size_t n;
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if (!file_updated)
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return;
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sprintf(tmp_file, "%s.rc", fname);
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/*
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* After reading the entire file into memory, delete it
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* and write it back, to prevent weird side effects of modifying
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* an object file in place.
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*/
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fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode);
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if (fd_map < 0) {
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perror(fname);
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fail_file();
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}
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n = write(fd_map, file_map, sb.st_size);
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if (n != sb.st_size) {
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perror("write");
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fail_file();
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}
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if (file_append_size) {
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n = write(fd_map, file_append, file_append_size);
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if (n != file_append_size) {
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perror("write");
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fail_file();
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}
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}
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close(fd_map);
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if (rename(tmp_file, fname) < 0) {
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perror(fname);
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fail_file();
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}
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}
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/* w8rev, w8nat, ...: Handle endianness. */
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static uint64_t w8rev(uint64_t const x)
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{
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return ((0xff & (x >> (0 * 8))) << (7 * 8))
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| ((0xff & (x >> (1 * 8))) << (6 * 8))
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| ((0xff & (x >> (2 * 8))) << (5 * 8))
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| ((0xff & (x >> (3 * 8))) << (4 * 8))
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| ((0xff & (x >> (4 * 8))) << (3 * 8))
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| ((0xff & (x >> (5 * 8))) << (2 * 8))
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| ((0xff & (x >> (6 * 8))) << (1 * 8))
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| ((0xff & (x >> (7 * 8))) << (0 * 8));
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}
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static uint32_t w4rev(uint32_t const x)
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{
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return ((0xff & (x >> (0 * 8))) << (3 * 8))
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| ((0xff & (x >> (1 * 8))) << (2 * 8))
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| ((0xff & (x >> (2 * 8))) << (1 * 8))
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| ((0xff & (x >> (3 * 8))) << (0 * 8));
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}
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static uint32_t w2rev(uint16_t const x)
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{
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return ((0xff & (x >> (0 * 8))) << (1 * 8))
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| ((0xff & (x >> (1 * 8))) << (0 * 8));
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}
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static uint64_t w8nat(uint64_t const x)
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{
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return x;
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}
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static uint32_t w4nat(uint32_t const x)
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{
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return x;
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}
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static uint32_t w2nat(uint16_t const x)
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{
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return x;
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}
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static uint64_t (*w8)(uint64_t);
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static uint32_t (*w)(uint32_t);
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static uint32_t (*w2)(uint16_t);
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/* Names of the sections that could contain calls to mcount. */
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static int
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is_mcounted_section_name(char const *const txtname)
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{
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return strncmp(".text", txtname, 5) == 0 ||
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strcmp(".init.text", txtname) == 0 ||
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strcmp(".ref.text", txtname) == 0 ||
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strcmp(".sched.text", txtname) == 0 ||
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strcmp(".spinlock.text", txtname) == 0 ||
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strcmp(".irqentry.text", txtname) == 0 ||
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strcmp(".softirqentry.text", txtname) == 0 ||
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strcmp(".kprobes.text", txtname) == 0 ||
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strcmp(".cpuidle.text", txtname) == 0 ||
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strcmp(".text.unlikely", txtname) == 0;
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}
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/* 32 bit and 64 bit are very similar */
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#include "recordmcount.h"
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#define RECORD_MCOUNT_64
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#include "recordmcount.h"
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/* 64-bit EM_MIPS has weird ELF64_Rela.r_info.
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* http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf
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* We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40]
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* to imply the order of the members; the spec does not say so.
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* typedef unsigned char Elf64_Byte;
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* fails on MIPS64 because their <elf.h> already has it!
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*/
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typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */
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union mips_r_info {
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Elf64_Xword r_info;
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struct {
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Elf64_Word r_sym; /* Symbol index. */
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myElf64_Byte r_ssym; /* Special symbol. */
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myElf64_Byte r_type3; /* Third relocation. */
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myElf64_Byte r_type2; /* Second relocation. */
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myElf64_Byte r_type; /* First relocation. */
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} r_mips;
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};
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static uint64_t MIPS64_r_sym(Elf64_Rel const *rp)
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{
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return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym);
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}
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static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type)
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{
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rp->r_info = ((union mips_r_info){
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.r_mips = { .r_sym = w(sym), .r_type = type }
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}).r_info;
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}
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static void
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do_file(char const *const fname)
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{
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Elf32_Ehdr *const ehdr = mmap_file(fname);
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unsigned int reltype = 0;
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w = w4nat;
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w2 = w2nat;
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w8 = w8nat;
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switch (ehdr->e_ident[EI_DATA]) {
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static unsigned int const endian = 1;
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default:
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fprintf(stderr, "unrecognized ELF data encoding %d: %s\n",
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ehdr->e_ident[EI_DATA], fname);
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fail_file();
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break;
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case ELFDATA2LSB:
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if (*(unsigned char const *)&endian != 1) {
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/* main() is big endian, file.o is little endian. */
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w = w4rev;
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w2 = w2rev;
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w8 = w8rev;
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|
}
|
|
ideal_nop4_arm = ideal_nop4_arm_le;
|
|
bl_mcount_arm = bl_mcount_arm_le;
|
|
push_arm = push_arm_le;
|
|
ideal_nop2_thumb = ideal_nop2_thumb_le;
|
|
push_bl_mcount_thumb = push_bl_mcount_thumb_le;
|
|
break;
|
|
case ELFDATA2MSB:
|
|
if (*(unsigned char const *)&endian != 0) {
|
|
/* main() is little endian, file.o is big endian. */
|
|
w = w4rev;
|
|
w2 = w2rev;
|
|
w8 = w8rev;
|
|
}
|
|
ideal_nop4_arm = ideal_nop4_arm_be;
|
|
bl_mcount_arm = bl_mcount_arm_be;
|
|
push_arm = push_arm_be;
|
|
ideal_nop2_thumb = ideal_nop2_thumb_be;
|
|
push_bl_mcount_thumb = push_bl_mcount_thumb_be;
|
|
break;
|
|
} /* end switch */
|
|
if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0
|
|
|| w2(ehdr->e_type) != ET_REL
|
|
|| ehdr->e_ident[EI_VERSION] != EV_CURRENT) {
|
|
fprintf(stderr, "unrecognized ET_REL file %s\n", fname);
|
|
fail_file();
|
|
}
|
|
|
|
gpfx = 0;
|
|
switch (w2(ehdr->e_machine)) {
|
|
default:
|
|
fprintf(stderr, "unrecognized e_machine %u %s\n",
|
|
w2(ehdr->e_machine), fname);
|
|
fail_file();
|
|
break;
|
|
case EM_386:
|
|
reltype = R_386_32;
|
|
rel_type_nop = R_386_NONE;
|
|
make_nop = make_nop_x86;
|
|
ideal_nop = ideal_nop5_x86_32;
|
|
mcount_adjust_32 = -1;
|
|
break;
|
|
case EM_ARM: reltype = R_ARM_ABS32;
|
|
altmcount = "__gnu_mcount_nc";
|
|
make_nop = make_nop_arm;
|
|
rel_type_nop = R_ARM_NONE;
|
|
break;
|
|
case EM_AARCH64:
|
|
reltype = R_AARCH64_ABS64;
|
|
make_nop = make_nop_arm64;
|
|
rel_type_nop = R_AARCH64_NONE;
|
|
ideal_nop = ideal_nop4_arm64;
|
|
gpfx = '_';
|
|
break;
|
|
case EM_IA_64: reltype = R_IA64_IMM64; gpfx = '_'; break;
|
|
case EM_MIPS: /* reltype: e_class */ gpfx = '_'; break;
|
|
case EM_PPC: reltype = R_PPC_ADDR32; gpfx = '_'; break;
|
|
case EM_PPC64: reltype = R_PPC64_ADDR64; gpfx = '_'; break;
|
|
case EM_S390: /* reltype: e_class */ gpfx = '_'; break;
|
|
case EM_SH: reltype = R_SH_DIR32; break;
|
|
case EM_SPARCV9: reltype = R_SPARC_64; gpfx = '_'; break;
|
|
case EM_X86_64:
|
|
make_nop = make_nop_x86;
|
|
ideal_nop = ideal_nop5_x86_64;
|
|
reltype = R_X86_64_64;
|
|
rel_type_nop = R_X86_64_NONE;
|
|
mcount_adjust_64 = -1;
|
|
break;
|
|
} /* end switch */
|
|
|
|
switch (ehdr->e_ident[EI_CLASS]) {
|
|
default:
|
|
fprintf(stderr, "unrecognized ELF class %d %s\n",
|
|
ehdr->e_ident[EI_CLASS], fname);
|
|
fail_file();
|
|
break;
|
|
case ELFCLASS32:
|
|
if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr)
|
|
|| w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) {
|
|
fprintf(stderr,
|
|
"unrecognized ET_REL file: %s\n", fname);
|
|
fail_file();
|
|
}
|
|
if (w2(ehdr->e_machine) == EM_MIPS) {
|
|
reltype = R_MIPS_32;
|
|
is_fake_mcount32 = MIPS32_is_fake_mcount;
|
|
}
|
|
do32(ehdr, fname, reltype);
|
|
break;
|
|
case ELFCLASS64: {
|
|
Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr;
|
|
if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr)
|
|
|| w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) {
|
|
fprintf(stderr,
|
|
"unrecognized ET_REL file: %s\n", fname);
|
|
fail_file();
|
|
}
|
|
if (w2(ghdr->e_machine) == EM_S390) {
|
|
reltype = R_390_64;
|
|
mcount_adjust_64 = -14;
|
|
}
|
|
if (w2(ghdr->e_machine) == EM_MIPS) {
|
|
reltype = R_MIPS_64;
|
|
Elf64_r_sym = MIPS64_r_sym;
|
|
Elf64_r_info = MIPS64_r_info;
|
|
is_fake_mcount64 = MIPS64_is_fake_mcount;
|
|
}
|
|
do64(ghdr, fname, reltype);
|
|
break;
|
|
}
|
|
} /* end switch */
|
|
|
|
write_file(fname);
|
|
cleanup();
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
const char ftrace[] = "/ftrace.o";
|
|
int ftrace_size = sizeof(ftrace) - 1;
|
|
int n_error = 0; /* gcc-4.3.0 false positive complaint */
|
|
int c;
|
|
int i;
|
|
|
|
while ((c = getopt(argc, argv, "w")) >= 0) {
|
|
switch (c) {
|
|
case 'w':
|
|
warn_on_notrace_sect = 1;
|
|
break;
|
|
default:
|
|
fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if ((argc - optind) < 1) {
|
|
fprintf(stderr, "usage: recordmcount [-w] file.o...\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Process each file in turn, allowing deep failure. */
|
|
for (i = optind; i < argc; i++) {
|
|
char *file = argv[i];
|
|
int const sjval = setjmp(jmpenv);
|
|
int len;
|
|
|
|
/*
|
|
* The file kernel/trace/ftrace.o references the mcount
|
|
* function but does not call it. Since ftrace.o should
|
|
* not be traced anyway, we just skip it.
|
|
*/
|
|
len = strlen(file);
|
|
if (len >= ftrace_size &&
|
|
strcmp(file + (len - ftrace_size), ftrace) == 0)
|
|
continue;
|
|
|
|
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;
|
|
mmap_failed = 1;
|
|
file_map = NULL;
|
|
file_ptr = NULL;
|
|
file_updated = 0;
|
|
do_file(file);
|
|
break;
|
|
case SJ_FAIL: /* error in do_file or below */
|
|
fprintf(stderr, "%s: failed\n", file);
|
|
++n_error;
|
|
break;
|
|
case SJ_SUCCEED: /* premature success */
|
|
/* do nothing */
|
|
break;
|
|
} /* end switch */
|
|
}
|
|
return !!n_error;
|
|
}
|