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scripts/recordmcount.c
16.7 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * recordmcount.c: construct a table of the locations of calls to 'mcount' * so that ftrace can find them quickly. * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>. All rights reserved. |
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* * Restructured to fit Linux format, as well as other updates: * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc. */ /* * Strategy: alter the .o file in-place. * * Append a new STRTAB that has the new section names, followed by a new array * ElfXX_Shdr[] that has the new section headers, followed by the section * contents for __mcount_loc and its relocations. The old shstrtab strings, * and the old ElfXX_Shdr[] array, remain as "garbage" (commonly, a couple * kilobytes.) Subsequent processing by /bin/ld (or the kernel module loader) * will ignore the garbage regions, because they are not designated by the * new .e_shoff nor the new ElfXX_Shdr[]. [In order to remove the garbage, * then use "ld -r" to create a new file that omits the garbage.] */ #include <sys/types.h> #include <sys/mman.h> #include <sys/stat.h> |
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#include <getopt.h> |
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#include <elf.h> #include <fcntl.h> |
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#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> |
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#ifndef EM_AARCH64 #define EM_AARCH64 183 |
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#define R_AARCH64_NONE 0 |
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#define R_AARCH64_ABS64 257 #endif |
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#define R_ARM_PC24 1 #define R_ARM_THM_CALL 10 #define R_ARM_CALL 28 |
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#define R_AARCH64_CALL26 283 |
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static int fd_map; /* File descriptor for file being modified. */ static int mmap_failed; /* Boolean flag. */ |
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static char gpfx; /* prefix for global symbol name (sometimes '_') */ static struct stat sb; /* Remember .st_size, etc. */ |
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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 */ static void *file_end; /* pointer to the end of the mapped file */ static int file_updated; /* flag to state file was changed */ static void *file_ptr; /* current file pointer location */ |
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static void *file_append; /* added to the end of the file */ static size_t file_append_size; /* how much is added to end of file */ |
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/* Per-file resource cleanup when multiple files. */ |
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static void file_append_cleanup(void) { free(file_append); file_append = NULL; file_append_size = 0; file_updated = 0; } static void mmap_cleanup(void) |
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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); file_map = NULL; |
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} |
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/* ulseek, uwrite, ...: Check return value for errors. */ |
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static off_t ulseek(off_t const offset, int const whence) |
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{ |
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switch (whence) { case SEEK_SET: file_ptr = file_map + offset; break; case SEEK_CUR: file_ptr += offset; break; case SEEK_END: file_ptr = file_map + (sb.st_size - offset); break; } if (file_ptr < file_map) { fprintf(stderr, "lseek: seek before file "); |
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return -1; |
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} |
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return file_ptr - file_map; |
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} |
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static ssize_t uwrite(void const *const buf, size_t const count) |
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{ |
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size_t cnt = count; off_t idx = 0; file_updated = 1; if (file_ptr + count >= file_end) { off_t aoffset = (file_ptr + count) - file_end; if (aoffset > file_append_size) { file_append = realloc(file_append, aoffset); file_append_size = aoffset; } if (!file_append) { perror("write"); |
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file_append_cleanup(); mmap_cleanup(); |
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return -1; |
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} if (file_ptr < file_end) { cnt = file_end - file_ptr; } else { cnt = 0; idx = aoffset - count; } |
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} |
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if (cnt) memcpy(file_ptr, buf, cnt); if (cnt < count) memcpy(file_append + idx, buf + cnt, count - cnt); file_ptr += count; return count; |
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} |
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static void * umalloc(size_t size) |
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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 ", size); |
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file_append_cleanup(); mmap_cleanup(); |
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return NULL; |
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} return addr; } |
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/* * Get the whole file as a programming convenience in order to avoid * malloc+lseek+read+free of many pieces. If successful, then mmap * avoids copying unused pieces; else just read the whole file. * Open for both read and write; new info will be appended to the file. * Use MAP_PRIVATE so that a few changes to the in-memory ElfXX_Ehdr * do not propagate to the file until an explicit overwrite at the last. * This preserves most aspects of consistency (all except .st_size) * for simultaneous readers of the file while we are appending to it. * However, multiple writers still are bad. We choose not to use * locking because it is expensive and the use case of kernel build * makes multiple writers unlikely. */ static void *mmap_file(char const *fname) { /* Avoid problems if early cleanup() */ fd_map = -1; mmap_failed = 1; file_map = NULL; file_ptr = NULL; file_updated = 0; sb.st_size = 0; fd_map = open(fname, O_RDONLY); if (fd_map < 0) { perror(fname); return NULL; } if (fstat(fd_map, &sb) < 0) { perror(fname); goto out; } if (!S_ISREG(sb.st_mode)) { fprintf(stderr, "not a regular file: %s ", fname); goto out; } file_map = mmap(0, sb.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd_map, 0); if (file_map == MAP_FAILED) { mmap_failed = 1; file_map = umalloc(sb.st_size); if (!file_map) { perror(fname); goto out; } if (read(fd_map, file_map, sb.st_size) != sb.st_size) { perror(fname); free(file_map); file_map = NULL; goto out; } } else mmap_failed = 0; out: close(fd_map); fd_map = -1; file_end = file_map + sb.st_size; return file_map; } |
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static unsigned char ideal_nop5_x86_64[5] = { 0x0f, 0x1f, 0x44, 0x00, 0x00 }; static unsigned char ideal_nop5_x86_32[5] = { 0x3e, 0x8d, 0x74, 0x26, 0x00 }; static unsigned char *ideal_nop; static char rel_type_nop; static int (*make_nop)(void *map, size_t const offset); static int make_nop_x86(void *map, size_t const offset) { uint32_t *ptr; unsigned char *op; /* Confirm we have 0xe8 0x0 0x0 0x0 0x0 */ ptr = map + offset; if (*ptr != 0) return -1; op = map + offset - 1; if (*op != 0xe8) return -1; /* convert to nop */ |
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if (ulseek(offset - 1, SEEK_SET) < 0) return -1; if (uwrite(ideal_nop, 5) < 0) return -1; |
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return 0; } |
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static unsigned char ideal_nop4_arm_le[4] = { 0x00, 0x00, 0xa0, 0xe1 }; /* mov r0, r0 */ static unsigned char ideal_nop4_arm_be[4] = { 0xe1, 0xa0, 0x00, 0x00 }; /* mov r0, r0 */ static unsigned char *ideal_nop4_arm; static unsigned char bl_mcount_arm_le[4] = { 0xfe, 0xff, 0xff, 0xeb }; /* bl */ static unsigned char bl_mcount_arm_be[4] = { 0xeb, 0xff, 0xff, 0xfe }; /* bl */ static unsigned char *bl_mcount_arm; static unsigned char push_arm_le[4] = { 0x04, 0xe0, 0x2d, 0xe5 }; /* push {lr} */ static unsigned char push_arm_be[4] = { 0xe5, 0x2d, 0xe0, 0x04 }; /* push {lr} */ static unsigned char *push_arm; static unsigned char ideal_nop2_thumb_le[2] = { 0x00, 0xbf }; /* nop */ static unsigned char ideal_nop2_thumb_be[2] = { 0xbf, 0x00 }; /* nop */ static unsigned char *ideal_nop2_thumb; static unsigned char push_bl_mcount_thumb_le[6] = { 0x00, 0xb5, 0xff, 0xf7, 0xfe, 0xff }; /* push {lr}, bl */ static unsigned char push_bl_mcount_thumb_be[6] = { 0xb5, 0x00, 0xf7, 0xff, 0xff, 0xfe }; /* push {lr}, bl */ static unsigned char *push_bl_mcount_thumb; static int make_nop_arm(void *map, size_t const offset) { char *ptr; int cnt = 1; int nop_size; size_t off = offset; ptr = map + offset; if (memcmp(ptr, bl_mcount_arm, 4) == 0) { if (memcmp(ptr - 4, push_arm, 4) == 0) { off -= 4; cnt = 2; } ideal_nop = ideal_nop4_arm; nop_size = 4; } else if (memcmp(ptr - 2, push_bl_mcount_thumb, 6) == 0) { cnt = 3; nop_size = 2; off -= 2; ideal_nop = ideal_nop2_thumb; } else return -1; /* Convert to nop */ |
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if (ulseek(off, SEEK_SET) < 0) return -1; |
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do { |
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if (uwrite(ideal_nop, nop_size) < 0) return -1; |
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} while (--cnt > 0); return 0; } |
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static unsigned char ideal_nop4_arm64[4] = {0x1f, 0x20, 0x03, 0xd5}; static int make_nop_arm64(void *map, size_t const offset) { uint32_t *ptr; ptr = map + offset; /* bl <_mcount> is 0x94000000 before relocation */ if (*ptr != 0x94000000) return -1; /* Convert to nop */ |
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if (ulseek(offset, SEEK_SET) < 0) return -1; if (uwrite(ideal_nop, 4) < 0) return -1; |
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return 0; } |
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static int write_file(const char *fname) |
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{ char tmp_file[strlen(fname) + 4]; size_t n; if (!file_updated) |
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return 0; |
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sprintf(tmp_file, "%s.rc", fname); /* * After reading the entire file into memory, delete it * and write it back, to prevent weird side effects of modifying * an object file in place. */ fd_map = open(tmp_file, O_WRONLY | O_TRUNC | O_CREAT, sb.st_mode); if (fd_map < 0) { perror(fname); |
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return -1; |
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} n = write(fd_map, file_map, sb.st_size); if (n != sb.st_size) { perror("write"); |
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close(fd_map); return -1; |
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} if (file_append_size) { n = write(fd_map, file_append, file_append_size); if (n != file_append_size) { perror("write"); |
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close(fd_map); return -1; |
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} |
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} |
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close(fd_map); if (rename(tmp_file, fname) < 0) { perror(fname); |
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return -1; |
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} |
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return 0; |
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} /* w8rev, w8nat, ...: Handle endianness. */ static uint64_t w8rev(uint64_t const x) { return ((0xff & (x >> (0 * 8))) << (7 * 8)) | ((0xff & (x >> (1 * 8))) << (6 * 8)) | ((0xff & (x >> (2 * 8))) << (5 * 8)) | ((0xff & (x >> (3 * 8))) << (4 * 8)) | ((0xff & (x >> (4 * 8))) << (3 * 8)) | ((0xff & (x >> (5 * 8))) << (2 * 8)) | ((0xff & (x >> (6 * 8))) << (1 * 8)) | ((0xff & (x >> (7 * 8))) << (0 * 8)); } static uint32_t w4rev(uint32_t const x) { return ((0xff & (x >> (0 * 8))) << (3 * 8)) | ((0xff & (x >> (1 * 8))) << (2 * 8)) | ((0xff & (x >> (2 * 8))) << (1 * 8)) | ((0xff & (x >> (3 * 8))) << (0 * 8)); } static uint32_t w2rev(uint16_t const x) { return ((0xff & (x >> (0 * 8))) << (1 * 8)) | ((0xff & (x >> (1 * 8))) << (0 * 8)); } static uint64_t w8nat(uint64_t const x) { return x; } static uint32_t w4nat(uint32_t const x) { return x; } static uint32_t w2nat(uint16_t const x) { return x; } static uint64_t (*w8)(uint64_t); static uint32_t (*w)(uint32_t); static uint32_t (*w2)(uint16_t); /* Names of the sections that could contain calls to mcount. */ |
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static int 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 || strcmp(".sched.text", txtname) == 0 || strcmp(".spinlock.text", txtname) == 0 || 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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} |
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static char const *already_has_rel_mcount = "success"; /* our work here is done! */ |
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/* 32 bit and 64 bit are very similar */ #include "recordmcount.h" #define RECORD_MCOUNT_64 #include "recordmcount.h" |
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static int arm_is_fake_mcount(Elf32_Rel const *rp) { switch (ELF32_R_TYPE(w(rp->r_info))) { case R_ARM_THM_CALL: case R_ARM_CALL: case R_ARM_PC24: return 0; } return 1; } |
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static int arm64_is_fake_mcount(Elf64_Rel const *rp) { return ELF64_R_TYPE(w(rp->r_info)) != R_AARCH64_CALL26; } |
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/* 64-bit EM_MIPS has weird ELF64_Rela.r_info. * http://techpubs.sgi.com/library/manuals/4000/007-4658-001/pdf/007-4658-001.pdf * We interpret Table 29 Relocation Operation (Elf64_Rel, Elf64_Rela) [p.40] * to imply the order of the members; the spec does not say so. * typedef unsigned char Elf64_Byte; * fails on MIPS64 because their <elf.h> already has it! */ typedef uint8_t myElf64_Byte; /* Type for a 8-bit quantity. */ union mips_r_info { Elf64_Xword r_info; struct { Elf64_Word r_sym; /* Symbol index. */ myElf64_Byte r_ssym; /* Special symbol. */ myElf64_Byte r_type3; /* Third relocation. */ myElf64_Byte r_type2; /* Second relocation. */ myElf64_Byte r_type; /* First relocation. */ } r_mips; }; static uint64_t MIPS64_r_sym(Elf64_Rel const *rp) { return w(((union mips_r_info){ .r_info = rp->r_info }).r_mips.r_sym); } static void MIPS64_r_info(Elf64_Rel *const rp, unsigned sym, unsigned type) { rp->r_info = ((union mips_r_info){ .r_mips = { .r_sym = w(sym), .r_type = type } }).r_info; } |
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static int do_file(char const *const fname) |
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{ |
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unsigned int reltype = 0; |
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Elf32_Ehdr *ehdr; |
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int rc = -1; |
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ehdr = mmap_file(fname); |
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if (!ehdr) goto out; |
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w = w4nat; w2 = w2nat; w8 = w8nat; switch (ehdr->e_ident[EI_DATA]) { static unsigned int const endian = 1; |
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default: |
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fprintf(stderr, "unrecognized ELF data encoding %d: %s ", ehdr->e_ident[EI_DATA], fname); |
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goto out; |
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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. */ w = w4rev; w2 = w2rev; 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; |
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break; case ELFDATA2MSB: |
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if (*(unsigned char const *)&endian != 0) { |
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/* main() is little endian, file.o is big endian. */ w = w4rev; w2 = w2rev; w8 = w8rev; } |
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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; |
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break; |
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} /* end switch */ |
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if (memcmp(ELFMAG, ehdr->e_ident, SELFMAG) != 0 || w2(ehdr->e_type) != ET_REL || ehdr->e_ident[EI_VERSION] != EV_CURRENT) { |
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fprintf(stderr, "unrecognized ET_REL file %s ", fname); |
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goto out; |
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} |
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gpfx = '_'; |
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switch (w2(ehdr->e_machine)) { |
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default: |
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fprintf(stderr, "unrecognized e_machine %u %s ", |
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w2(ehdr->e_machine), fname); |
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goto out; |
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case EM_386: reltype = R_386_32; |
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rel_type_nop = R_386_NONE; |
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make_nop = make_nop_x86; ideal_nop = ideal_nop5_x86_32; |
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mcount_adjust_32 = -1; |
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gpfx = 0; break; case EM_ARM: reltype = R_ARM_ABS32; altmcount = "__gnu_mcount_nc"; make_nop = make_nop_arm; rel_type_nop = R_ARM_NONE; |
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is_fake_mcount32 = arm_is_fake_mcount; |
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gpfx = 0; |
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break; |
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case EM_AARCH64: |
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reltype = R_AARCH64_ABS64; make_nop = make_nop_arm64; rel_type_nop = R_AARCH64_NONE; ideal_nop = ideal_nop4_arm64; |
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is_fake_mcount64 = arm64_is_fake_mcount; |
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break; case EM_IA_64: reltype = R_IA64_IMM64; break; case EM_MIPS: /* reltype: e_class */ break; case EM_PPC: reltype = R_PPC_ADDR32; break; case EM_PPC64: reltype = R_PPC64_ADDR64; break; case EM_S390: /* reltype: e_class */ break; case EM_SH: reltype = R_SH_DIR32; gpfx = 0; break; case EM_SPARCV9: reltype = R_SPARC_64; break; |
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case EM_X86_64: make_nop = make_nop_x86; ideal_nop = ideal_nop5_x86_64; reltype = R_X86_64_64; |
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rel_type_nop = R_X86_64_NONE; |
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mcount_adjust_64 = -1; |
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gpfx = 0; |
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break; |
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} /* end switch */ switch (ehdr->e_ident[EI_CLASS]) { |
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default: |
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564 565 566 |
fprintf(stderr, "unrecognized ELF class %d %s ", ehdr->e_ident[EI_CLASS], fname); |
3f1df1201
|
567 |
goto out; |
e90b0c8bf
|
568 |
case ELFCLASS32: |
dd5477ff3
|
569 570 |
if (w2(ehdr->e_ehsize) != sizeof(Elf32_Ehdr) || w2(ehdr->e_shentsize) != sizeof(Elf32_Shdr)) { |
81d3858d3
|
571 572 573 |
fprintf(stderr, "unrecognized ET_REL file: %s ", fname); |
3f1df1201
|
574 |
goto out; |
81d3858d3
|
575 |
} |
dd5477ff3
|
576 |
if (w2(ehdr->e_machine) == EM_MIPS) { |
a2d49358b
|
577 |
reltype = R_MIPS_32; |
412910cd0
|
578 579 |
is_fake_mcount32 = MIPS32_is_fake_mcount; } |
3f1df1201
|
580 581 |
if (do32(ehdr, fname, reltype) < 0) goto out; |
e90b0c8bf
|
582 |
break; |
81d3858d3
|
583 584 |
case ELFCLASS64: { Elf64_Ehdr *const ghdr = (Elf64_Ehdr *)ehdr; |
dd5477ff3
|
585 586 |
if (w2(ghdr->e_ehsize) != sizeof(Elf64_Ehdr) || w2(ghdr->e_shentsize) != sizeof(Elf64_Shdr)) { |
81d3858d3
|
587 588 589 |
fprintf(stderr, "unrecognized ET_REL file: %s ", fname); |
3f1df1201
|
590 |
goto out; |
81d3858d3
|
591 |
} |
f29638868
|
592 |
if (w2(ghdr->e_machine) == EM_S390) { |
81d3858d3
|
593 |
reltype = R_390_64; |
c933146a5
|
594 |
mcount_adjust_64 = -14; |
f29638868
|
595 |
} |
dd5477ff3
|
596 |
if (w2(ghdr->e_machine) == EM_MIPS) { |
a2d49358b
|
597 598 599 |
reltype = R_MIPS_64; Elf64_r_sym = MIPS64_r_sym; Elf64_r_info = MIPS64_r_info; |
412910cd0
|
600 |
is_fake_mcount64 = MIPS64_is_fake_mcount; |
a2d49358b
|
601 |
} |
3f1df1201
|
602 603 |
if (do64(ghdr, fname, reltype) < 0) goto out; |
e90b0c8bf
|
604 605 |
break; } |
81d3858d3
|
606 |
} /* end switch */ |
3f1df1201
|
607 608 |
rc = write_file(fname); out: |
4fbcf0741
|
609 610 |
file_append_cleanup(); mmap_cleanup(); |
3f1df1201
|
611 |
return rc; |
81d3858d3
|
612 |
} |
3aec86382
|
613 |
int main(int argc, char *argv[]) |
81d3858d3
|
614 |
{ |
cd3478f2b
|
615 |
const char ftrace[] = "/ftrace.o"; |
444758636
|
616 |
int ftrace_size = sizeof(ftrace) - 1; |
81d3858d3
|
617 |
int n_error = 0; /* gcc-4.3.0 false positive complaint */ |
dfad3d598
|
618 619 |
int c; int i; |
444758636
|
620 |
|
dfad3d598
|
621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 |
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... "); return 0; } } if ((argc - optind) < 1) { fprintf(stderr, "usage: recordmcount [-w] file.o... "); |
444758636
|
636 637 638 639 |
return 0; } /* Process each file in turn, allowing deep failure. */ |
dfad3d598
|
640 641 |
for (i = optind; i < argc; i++) { char *file = argv[i]; |
444758636
|
642 643 644 645 646 647 648 |
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. */ |
dfad3d598
|
649 |
len = strlen(file); |
444758636
|
650 |
if (len >= ftrace_size && |
dfad3d598
|
651 |
strcmp(file + (len - ftrace_size), ftrace) == 0) |
444758636
|
652 |
continue; |
3f1df1201
|
653 |
if (do_file(file)) { |
713a3e4de
|
654 655 |
fprintf(stderr, "%s: failed ", file); |
81d3858d3
|
656 |
++n_error; |
3f1df1201
|
657 |
} |
81d3858d3
|
658 659 660 |
} return !!n_error; } |