1 files changed, 191 insertions, 0 deletions

diff --git a/scripts/sortextable.h b/scripts/sortextable.h
new file mode 100644
index 000000000000..e4fd45b7e456
--- /dev/null
+++ b/scripts/sortextable.h
@@ -0,0 +1,191 @@
+/*
+ * 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;
+        Elf_Sym *sort_needed_sym;
+        Elf_Shdr *sort_needed_sec;
+        Elf_Rel *relocs = NULL;
+        int relocs_size;
+        uint32_t *sort_done_location;
+        const char *secstrtab;
+        const char *strtab;
+        char *extab_image;
+        int extab_index = 0;
+        int i;
+        int idx;
+
+        shdr = (Elf_Shdr *)((char *)ehdr + _r(&ehdr->e_shoff));
+        shstrtab_sec = shdr + r2(&ehdr->e_shstrndx);
+        secstrtab = (const char *)ehdr + _r(&shstrtab_sec->sh_offset);
+        for (i = 0; i < r2(&ehdr->e_shnum); 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 (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();
+        }
+        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[r2(&sort_needed_sym->st_shndx)];
+        sort_done_location = (void *)ehdr +
+                _r(&sort_needed_sec->sh_offset) +
+                _r(&sort_needed_sym->st_value) -
+                _r(&sort_needed_sec->sh_addr);
+
+#if 1
+        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);
+}