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![Steven Rostedt (VMware)](/assets/img/avatar_default.png)
Adding a hook into free_reserve_area() that informs ftrace that boot up init text is being free, lets ftrace safely remove those init functions from its records, which keeps ftrace from trying to modify text that no longer exists. Note, this still does not allow for tracing .init text of modules, as modules require different work for freeing its init code. Link: http://lkml.kernel.org/r/1488502497.7212.24.camel@linux.intel.com Cc: linux-mm@kvack.org Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Peter Zijlstra <peterz@infradead.org> Requested-by: Todd Brandt <todd.e.brandt@linux.intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
673 lines
17 KiB
C
673 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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/*
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* glibc synced up and added the metag number but didn't add the relocations.
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* Work around this in a crude manner for now.
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*/
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#ifndef EM_METAG
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#define EM_METAG 174
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#endif
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#ifndef R_METAG_ADDR32
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#define R_METAG_ADDR32 2
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#endif
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#ifndef R_METAG_NONE
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#define R_METAG_NONE 3
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#endif
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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 strcmp(".text", txtname) == 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);
|
|
fail_file();
|
|
break;
|
|
case ELFDATA2LSB:
|
|
if (*(unsigned char const *)&endian != 1) {
|
|
/* main() is big endian, file.o is little endian. */
|
|
w = w4rev;
|
|
w2 = w2rev;
|
|
w8 = w8rev;
|
|
}
|
|
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 %d %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_METAG: reltype = R_METAG_ADDR32;
|
|
altmcount = "_mcount_wrapper";
|
|
rel_type_nop = R_METAG_NONE;
|
|
/* We happen to have the same requirement as MIPS */
|
|
is_fake_mcount32 = MIPS32_is_fake_mcount;
|
|
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;
|
|
}
|