objcommon.h

   1 #include <bfd.h>
   2 #include <limits.h>
   3 #include <stdbool.h>
   4 #include <stddef.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8
   9 #define BITS_PER_LONG LONG_BIT
  10
  11 #define DIE do { fprintf(stderr, "ksplice: died at %s:%d\n", __FILE__, __LINE__); abort(); } while(0)
  12 #define assert(x) do { if(!(x)) DIE; } while(0)
  13 #define align(x, n) ((((x)+(n)-1)/(n))*(n))
  14
  15 #define container_of(ptr, type, member) ({                      \
  16         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  17         (type *)( (char *)__mptr - offsetof(type,member) );})
  18
  19 #define DECLARE_VEC_TYPE(elt_t, vectype)        \
  20         struct vectype {                        \
  21                 elt_t *data;                    \
  22                 size_t size;                    \
  23                 size_t mem_size;                \
  24         }
  25
  26 /* void vec_init(struct vectype *vec); */
  27 #define vec_init(vec) *(vec) = (typeof(*(vec))) { NULL, 0, 0 }
  28
  29 /* void vec_move(struct vectype *dstvec, struct vectype *srcvec); */
  30 #define vec_move(dstvec, srcvec) do {                   \
  31                 typeof(srcvec) _srcvec = (srcvec);      \
  32                 *(dstvec) = *(_srcvec);                 \
  33                 vec_init(_srcvec);                      \
  34         } while (0)
  35
  36 /* void vec_free(struct vectype *vec); */
  37 #define vec_free(vec) do {                      \
  38                 typeof(vec) _vec1 = (vec);      \
  39                 free(_vec1->data);              \
  40                 vec_init(_vec1);                \
  41         } while (0)
  42
  43 void vec_do_reserve(void **data, size_t *mem_size, size_t newsize);
  44
  45 /* void vec_reserve(struct vectype *vec, size_t new_mem_size); */
  46 #define vec_reserve(vec, new_mem_size) do {                             \
  47                 typeof(vec) _vec2 = (vec);                              \
  48                 vec_do_reserve((void **)&_vec2->data, &_vec2->mem_size, \
  49                                (new_mem_size));                         \
  50         } while (0)
  51
  52 /* void vec_resize(struct vectype *vec, size_t new_size); */
  53 #define vec_resize(vec, new_size) do {                                  \
  54                 typeof(vec) _vec3 = (vec);                              \
  55                 _vec3->size = (new_size);                               \
  56                 vec_reserve(_vec3, _vec3->size * sizeof(*_vec3->data)); \
  57         } while (0)
  58
  59 /* elt_t *vec_grow(struct vectype *vec, size_t n); */
  60 #define vec_grow(vec, n) ({                             \
  61                 typeof(vec) _vec4 = (vec);              \
  62                 size_t _n = (n);                        \
  63                 vec_resize(_vec4, _vec4->size + _n);    \
  64                 _vec4->data + (_vec4->size - _n);       \
  65         })
  66
  67 DECLARE_VEC_TYPE(void, void_vec);
  68 DECLARE_VEC_TYPE(arelent *, arelentp_vec);
  69 DECLARE_VEC_TYPE(asymbol *, asymbolp_vec);
  70
  71 #define DECLARE_HASH_TYPE(elt_t, hashtype,                              \
  72                           hashtype_init, hashtype_free,                 \
  73                           hashtype_lookup)                              \
  74         struct hashtype {                                               \
  75                 struct bfd_hash_table root;                             \
  76         };                                                              \
  77                                                                         \
  78         void hashtype_init(struct hashtype *table);                     \
  79         void hashtype_free(struct hashtype *table);                     \
  80         typeof(elt_t) *hashtype_lookup(struct hashtype *table,          \
  81                                        const char *string,              \
  82                                        bfd_boolean create)
  83
  84 #ifndef BFD_HASH_TABLE_HAS_ENTSIZE
  85 #define bfd_hash_table_init(table, newfunc, entry)      \
  86         bfd_hash_table_init(table, newfunc)
  87 #endif
  88
  89 #define DEFINE_HASH_TYPE(elt_t, hashtype,                               \
  90                          hashtype_init, hashtype_free,                  \
  91                          hashtype_lookup,                               \
  92                          elt_construct)                                 \
  93         DECLARE_HASH_TYPE(elt_t, hashtype, hashtype_init,               \
  94                           hashtype_free, hashtype_lookup);              \
  95                                                                         \
  96         struct hashtype##_entry {                                       \
  97                 struct bfd_hash_entry root;                             \
  98                 typeof(elt_t) val;                                      \
  99         };                                                              \
 100                                                                         \
 101         static struct bfd_hash_entry *hashtype##_newfunc(               \
 102             struct bfd_hash_entry *entry,                               \
 103             struct bfd_hash_table *table,                               \
 104             const char *string)                                         \
 105         {                                                               \
 106                 if (entry == NULL) {                                    \
 107                         entry = bfd_hash_allocate(table,                \
 108                             sizeof(struct hashtype##_entry));           \
 109                         if (entry == NULL)                              \
 110                                 return entry;                           \
 111                 }                                                       \
 112                 entry = bfd_hash_newfunc(entry, table, string);         \
 113                 typeof(elt_t) *v =                                      \
 114                     &container_of(entry, struct hashtype##_entry,       \
 115                                   root)->val;                           \
 116                 elt_construct(v);                                       \
 117                 return entry;                                           \
 118         };                                                              \
 119                                                                         \
 120         void hashtype_init(struct hashtype *table)                      \
 121         {                                                               \
 122                 bfd_hash_table_init(&table->root, hashtype##_newfunc,   \
 123                                     sizeof(struct hashtype##_entry));   \
 124         }                                                               \
 125                                                                         \
 126         void hashtype_free(struct hashtype *table)                      \
 127         {                                                               \
 128                 bfd_hash_table_free(&table->root);                      \
 129         }                                                               \
 130                                                                         \
 131         typeof(elt_t) *hashtype_lookup(struct hashtype *table,          \
 132                                        const char *string,              \
 133                                        bfd_boolean create)              \
 134         {                                                               \
 135                 struct bfd_hash_entry *e =                              \
 136                     bfd_hash_lookup(&table->root, string, create,       \
 137                                     TRUE);                              \
 138                 if (create)                                             \
 139                         assert(e != NULL);                              \
 140                 else if (e == NULL)                                     \
 141                         return NULL;                                    \
 142                 return &container_of(e, struct hashtype##_entry,        \
 143                                      root)->val;                        \
 144         }                                                               \
 145                                                                         \
 146         struct eat_trailing_semicolon
 147
 148 #ifndef bfd_get_section_size
 149 #define bfd_get_section_size(x) ((x)->_cooked_size)
 150 #endif
 151
 152 struct label_map {
 153         asymbol *csym;
 154         const char *orig_label;
 155         const char *label;
 156         int count;
 157         int index;
 158 };
 159 DECLARE_VEC_TYPE(struct label_map, label_map_vec);
 160
 161 struct superbfd {
 162         bfd *abfd;
 163         struct asymbolp_vec syms;
 164         struct supersect *new_supersects;
 165         struct label_map_vec maps;
 166 };
 167
 168 struct supersect {
 169         struct superbfd *parent;
 170         const char *name;
 171         flagword flags;
 172         struct void_vec contents;
 173         int alignment;
 174         struct arelentp_vec relocs;
 175         struct arelentp_vec new_relocs;
 176         struct supersect *next;
 177         struct asymbolp_vec syms;
 178         asymbol *symbol;
 179 };
 180
 181 struct kernel_symbol {
 182         unsigned long value;
 183         char *name;
 184 };
 185
 186 struct exception_table_entry {
 187         unsigned long insn, fixup;
 188 };
 189
 190 struct superbfd *fetch_superbfd(bfd *abfd);
 191 struct supersect *fetch_supersect(struct superbfd *sbfd, asection *sect);
 192 struct supersect *new_supersect(struct superbfd *sbfd, const char *name);
 193 void supersect_move(struct supersect *dest_ss, struct supersect *src_ss);
 194
 195 #define sect_grow(ss, n, type)                                  \
 196         ((type *)sect_do_grow(ss, n, sizeof(type), __alignof__(type)))
 197 void *sect_do_grow(struct supersect *ss, size_t n, size_t size, int alignment);
 198
 199 #define sect_copy(dest_ss, dest, src_ss, src, n)                        \
 200         sect_do_copy(dest_ss, dest, src_ss, src, (n) * sizeof(*(src)))
 201 void sect_do_copy(struct supersect *dest_ss, void *dest,
 202                   struct supersect *src_ss, const void *src, size_t n);
 203
 204 #define starts_with(str, prefix)                        \
 205         (strncmp(str, prefix, strlen(prefix)) == 0)
 206 #define ends_with(str, suffix)                                          \
 207         (strlen(str) >= strlen(suffix) &&                               \
 208          strcmp(&str[strlen(str) - strlen(suffix)], suffix) == 0)
 209
 210 bfd_vma addr_offset(struct supersect *ss, const void *addr);
 211 bfd_vma get_reloc_offset(struct supersect *ss, arelent *reloc, bool adjust_pc);
 212 bfd_vma read_reloc(struct supersect *ss, const void *addr, size_t size,
 213                    asymbol **symp);
 214 const void *read_pointer(struct supersect *ss, void *const *addr,
 215                          struct supersect **ssp);
 216 const char *read_string(struct supersect *ss, const char *const *addr);
 217 char *str_pointer(struct supersect *ss, void *const *addr);
 218
 219 #define read_num(ss, addr) ((typeof(*(addr))) \
 220                             read_reloc(ss, addr, sizeof(*(addr)), NULL))
 221
 222 asymbol *canonical_symbol(struct superbfd *sbfd, asymbol *sym);
 223 asymbol **canonical_symbolp(struct superbfd *sbfd, asymbol *sym);
 224 const char *label_lookup(struct superbfd *sbfd, asymbol *sym);
 225 void read_label_map(struct superbfd *sbfd);
 226
 227 bool is_special(asection *sect);