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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /scripts/sortextable.h
Initial import
Diffstat (limited to 'scripts/sortextable.h')
-rw-r--r--scripts/sortextable.h211
1 files changed, 211 insertions, 0 deletions
diff --git a/scripts/sortextable.h b/scripts/sortextable.h
new file mode 100644
index 000000000..ba8700428
--- /dev/null
+++ b/scripts/sortextable.h
@@ -0,0 +1,211 @@
+/*
+ * 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;
+}
+
+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);
+}