cregit-Linux how code gets into the kernel

Release 4.15 scripts/sortextable.h

Directory: scripts
/*
 * sortextable.h
 *
 * Copyright 2011 - 2012 Cavium, Inc.
 *
 * Some of this code was taken out of recordmcount.h written by:
 *
 * Copyright 2009 John F. Reiser <jreiser@BitWagon.com>.  All rights reserved.
 * Copyright 2010 Steven Rostedt <srostedt@redhat.com>, Red Hat Inc.
 *
 *
 * Licensed under the GNU General Public License, version 2 (GPLv2).
 */


#undef extable_ent_size

#undef compare_extable

#undef do_func

#undef Elf_Addr

#undef Elf_Ehdr

#undef Elf_Shdr

#undef Elf_Rel

#undef Elf_Rela

#undef Elf_Sym

#undef ELF_R_SYM

#undef Elf_r_sym

#undef ELF_R_INFO

#undef Elf_r_info

#undef ELF_ST_BIND

#undef ELF_ST_TYPE

#undef fn_ELF_R_SYM

#undef fn_ELF_R_INFO

#undef uint_t

#undef _r

#undef _w

#ifdef SORTEXTABLE_64

# define extable_ent_size	16

# define compare_extable	compare_extable_64

# define do_func		do64

# define Elf_Addr		Elf64_Addr

# define Elf_Ehdr		Elf64_Ehdr

# define Elf_Shdr		Elf64_Shdr

# define Elf_Rel		Elf64_Rel

# define Elf_Rela		Elf64_Rela

# define Elf_Sym		Elf64_Sym

# define ELF_R_SYM		ELF64_R_SYM

# define Elf_r_sym		Elf64_r_sym

# define ELF_R_INFO		ELF64_R_INFO

# define Elf_r_info		Elf64_r_info

# define ELF_ST_BIND		ELF64_ST_BIND

# define ELF_ST_TYPE		ELF64_ST_TYPE

# define fn_ELF_R_SYM		fn_ELF64_R_SYM

# define fn_ELF_R_INFO		fn_ELF64_R_INFO

# define uint_t			uint64_t

# define _r			r8

# define _w			w8
#else

# define extable_ent_size	8

# define compare_extable	compare_extable_32

# define do_func		do32

# define Elf_Addr		Elf32_Addr

# define Elf_Ehdr		Elf32_Ehdr

# define Elf_Shdr		Elf32_Shdr

# define Elf_Rel		Elf32_Rel

# define Elf_Rela		Elf32_Rela

# define Elf_Sym		Elf32_Sym

# define ELF_R_SYM		ELF32_R_SYM

# define Elf_r_sym		Elf32_r_sym

# define ELF_R_INFO		ELF32_R_INFO

# define Elf_r_info		Elf32_r_info

# define ELF_ST_BIND		ELF32_ST_BIND

# define ELF_ST_TYPE		ELF32_ST_TYPE

# define fn_ELF_R_SYM		fn_ELF32_R_SYM

# define fn_ELF_R_INFO		fn_ELF32_R_INFO

# define uint_t			uint32_t

# define _r			r

# define _w			w
#endif


static int compare_extable(const void *a, const void *b) { Elf_Addr av = _r(a); Elf_Addr bv = _r(b); if (av < bv) return -1; if (av > bv) return 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
David Daney54100.00%2100.00%
Total54100.00%2100.00%


static void do_func(Elf_Ehdr *ehdr, char const *const fname, table_sort_t custom_sort) { Elf_Shdr *shdr; Elf_Shdr *shstrtab_sec; Elf_Shdr *strtab_sec = NULL; Elf_Shdr *symtab_sec = NULL; Elf_Shdr *extab_sec = NULL; Elf_Sym *sym; const Elf_Sym *symtab; Elf32_Word *symtab_shndx_start = NULL; Elf_Sym *sort_needed_sym; Elf_Shdr *sort_needed_sec; Elf_Rel *relocs = NULL; int relocs_size = 0; uint32_t *sort_done_location; const char *secstrtab; const char *strtab; char *extab_image; int extab_index = 0; int i; int idx; unsigned int num_sections; unsigned int secindex_strings; shdr = (Elf_Shdr *)((char *)ehdr + _r(&ehdr->e_shoff)); num_sections = r2(&ehdr->e_shnum); if (num_sections == SHN_UNDEF) num_sections = _r(&shdr[0].sh_size); secindex_strings = r2(&ehdr->e_shstrndx); if (secindex_strings == SHN_XINDEX) secindex_strings = r(&shdr[0].sh_link); shstrtab_sec = shdr + secindex_strings; secstrtab = (const char *)ehdr + _r(&shstrtab_sec->sh_offset); for (i = 0; i < num_sections; i++) { idx = r(&shdr[i].sh_name); if (strcmp(secstrtab + idx, "__ex_table") == 0) { extab_sec = shdr + i; extab_index = i; } if ((r(&shdr[i].sh_type) == SHT_REL || r(&shdr[i].sh_type) == SHT_RELA) && r(&shdr[i].sh_info) == extab_index) { relocs = (void *)ehdr + _r(&shdr[i].sh_offset); relocs_size = _r(&shdr[i].sh_size); } if (strcmp(secstrtab + idx, ".symtab") == 0) symtab_sec = shdr + i; if (strcmp(secstrtab + idx, ".strtab") == 0) strtab_sec = shdr + i; if (r(&shdr[i].sh_type) == SHT_SYMTAB_SHNDX) symtab_shndx_start = (Elf32_Word *)( (const char *)ehdr + _r(&shdr[i].sh_offset)); } if (strtab_sec == NULL) { fprintf(stderr, "no .strtab in file: %s\n", fname); fail_file(); } if (symtab_sec == NULL) { fprintf(stderr, "no .symtab in file: %s\n", fname); fail_file(); } symtab = (const Elf_Sym *)((const char *)ehdr + _r(&symtab_sec->sh_offset)); if (extab_sec == NULL) { fprintf(stderr, "no __ex_table in file: %s\n", fname); fail_file(); } strtab = (const char *)ehdr + _r(&strtab_sec->sh_offset); extab_image = (void *)ehdr + _r(&extab_sec->sh_offset); if (custom_sort) { custom_sort(extab_image, _r(&extab_sec->sh_size)); } else { int num_entries = _r(&extab_sec->sh_size) / extable_ent_size; qsort(extab_image, num_entries, extable_ent_size, compare_extable); } /* If there were relocations, we no longer need them. */ if (relocs) memset(relocs, 0, relocs_size); /* find main_extable_sort_needed */ sort_needed_sym = NULL; for (i = 0; i < _r(&symtab_sec->sh_size) / sizeof(Elf_Sym); i++) { sym = (void *)ehdr + _r(&symtab_sec->sh_offset); sym += i; if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT) continue; idx = r(&sym->st_name); if (strcmp(strtab + idx, "main_extable_sort_needed") == 0) { sort_needed_sym = sym; break; } } if (sort_needed_sym == NULL) { fprintf(stderr, "no main_extable_sort_needed symbol in file: %s\n", fname); fail_file(); } sort_needed_sec = &shdr[get_secindex(r2(&sym->st_shndx), sort_needed_sym - symtab, symtab_shndx_start)]; sort_done_location = (void *)ehdr + _r(&sort_needed_sec->sh_offset) + _r(&sort_needed_sym->st_value) - _r(&sort_needed_sec->sh_addr); #if 0 printf("sort done marker at %lx\n", (unsigned long)((char *)sort_done_location - (char *)ehdr)); #endif /* We sorted it, clear the flag. */ w(0, sort_done_location); }

Contributors

PersonTokensPropCommitsCommitProp
David Daney63480.56%240.00%
Jamie Iles14918.93%120.00%
Arnd Bergmann20.25%120.00%
Tim Gardner20.25%120.00%
Total787100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
David Daney91685.69%240.00%
Jamie Iles14913.94%120.00%
Arnd Bergmann20.19%120.00%
Tim Gardner20.19%120.00%
Total1069100.00%5100.00%
Directory: scripts
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