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Diffstat (limited to 'elf')
-rw-r--r--elf/dl-deps.c73
-rw-r--r--elf/dynamic-link.h10
-rw-r--r--elf/elf.h84
-rw-r--r--elf/link.h7
4 files changed, 143 insertions, 31 deletions
diff --git a/elf/dl-deps.c b/elf/dl-deps.c
index f034196762..7a6772979b 100644
--- a/elf/dl-deps.c
+++ b/elf/dl-deps.c
@@ -32,7 +32,7 @@ _dl_map_object_deps (struct link_map *map,
struct link_map *map;
struct list *next;
};
- struct list head[2 + npreloads], *tailp, *scanp;
+ struct list *head, *tailp, *scanp;
struct list duphead, *duptailp;
unsigned int nduplist;
unsigned int nlist, naux, i;
@@ -49,36 +49,57 @@ _dl_map_object_deps (struct link_map *map,
naux = nlist = 0;
-#define AUXTAG (DT_NUM + DT_PROCNUM + DT_EXTRATAGIDX (DT_AUXILIARY))
+ /* XXX The AUXILIARY implementation isn't correct in the moment. XXX
+ XXX The problem is that we currently do not handle auxiliary XXX
+ XXX entries in the loaded objects. XXX */
+#define AUXTAG (DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM \
+ + DT_EXTRATAGIDX (DT_AUXILIARY))
+
+ /* First determine the number of auxiliary objects we have to load. */
if (map->l_info[AUXTAG])
{
- /* There is an auxiliary library specified. We try to load it,
- and if we can, use its symbols in preference to our own.
- But if we can't load it, we just silently ignore it.
- XXX support multiple DT_AUXILIARYs?
- */
- struct link_map *aux;
- void openaux (void)
- {
- const char *strtab
- = ((void *) map->l_addr + map->l_info[DT_STRTAB]->d_un.d_ptr);
- aux = _dl_map_object (map, strtab + map->l_info[AUXTAG]->d_un.d_val,
- map->l_type == lt_executable ? lt_library :
- map->l_type, trace_mode);
- }
- char *errstring;
- const char *objname;
- if (! _dl_catch_error (&errstring, &objname, &openaux))
- {
- /* The auxiliary object is actually there. Use it
- as the first search element, even before MAP itself. */
- preload (aux);
- naux = 1;
- }
+ ElfW(Dyn) *d;
+ for (d = map->l_ld; d->d_tag != DT_NULL; ++d)
+ if (d->d_tag == DT_AUXILIARY)
+ ++naux;
+ }
+
+ /* Now we can allocate the array for the linker maps. */
+ head = (struct list *) alloca (sizeof (struct list)
+ * (naux + npreloads + 2));
+
+ /* Load the auxiliary objects, even before the object itself. */
+ if (map->l_info[AUXTAG])
+ {
+ /* There is at least one auxiliary library specified. We try to
+ load it, and if we can, use its symbols in preference to our
+ own. But if we can't load it, we just silently ignore it. */
+ const char *strtab
+ = ((void *) map->l_addr + map->l_info[DT_STRTAB]->d_un.d_ptr);
+ ElfW(Dyn) *d;
+
+ for (d = map->l_ld; d->d_tag != DT_NULL; ++d)
+ if (d->d_tag == DT_AUXILIARY)
+ {
+ struct link_map *aux;
+ void openaux (void)
+ {
+ aux = _dl_map_object (map, strtab + d->d_un.d_val,
+ (map->l_type == lt_executable
+ ? lt_library : map->l_type),
+ trace_mode);
+ }
+ char *errstring;
+ const char *objname;
+ if (! _dl_catch_error (&errstring, &objname, openaux))
+ /* The auxiliary object is actually there. Use it as
+ the first search element, even before MAP itself. */
+ preload (aux);
+ }
}
- /* Start the search list with one element: MAP itself. */
+ /* Next load MAP itself. */
preload (map);
/* Add the preloaded items after MAP but before any of its dependencies. */
diff --git a/elf/dynamic-link.h b/elf/dynamic-link.h
index c613f824d8..1d134ddf2f 100644
--- a/elf/dynamic-link.h
+++ b/elf/dynamic-link.h
@@ -26,11 +26,12 @@
static inline void __attribute__ ((unused))
elf_get_dynamic_info (ElfW(Dyn) *dyn,
- ElfW(Dyn) *info[DT_NUM + DT_PROCNUM + DT_EXTRANUM])
+ ElfW(Dyn) *info[DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM
+ + DT_EXTRANUM])
{
unsigned int i;
- for (i = 0; i < DT_NUM + DT_PROCNUM + DT_EXTRANUM; ++i)
+ for (i = 0; i < DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM + DT_EXTRANUM; ++i)
info[i] = NULL;
if (! dyn)
@@ -43,8 +44,11 @@ elf_get_dynamic_info (ElfW(Dyn) *dyn,
else if (dyn->d_tag >= DT_LOPROC &&
dyn->d_tag < DT_LOPROC + DT_PROCNUM)
info[dyn->d_tag - DT_LOPROC + DT_NUM] = dyn;
+ else if ((Elf32_Word) DT_VERSIONTAGIDX (dyn->d_tag) < DT_VERSIONTAGNUM)
+ info[DT_VERSIONTAGIDX (dyn->d_tag) + DT_NUM + DT_PROCNUM] = dyn;
else if ((Elf32_Word) DT_EXTRATAGIDX (dyn->d_tag) < DT_EXTRANUM)
- info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_PROCNUM] = dyn;
+ info[DT_EXTRATAGIDX (dyn->d_tag) + DT_NUM + DT_PROCNUM
+ + DT_VERSIONTAGNUM] = dyn;
else
assert (! "bad dynamic tag");
dyn++;
diff --git a/elf/elf.h b/elf/elf.h
index d25934b411..05eeb3664f 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -232,6 +232,11 @@ typedef struct
#define SHT_SHLIB 10 /* Reserved */
#define SHT_DYNSYM 11 /* Dynamic linker symbol table */
#define SHT_NUM 12 /* Number of defined types. */
+#define SHT_LOSUNW 0x6ffffffd /* Sun-specific low bound. */
+#define SHT_GNU_verdef 0x6ffffffd /* Version definition section. */
+#define SHT_GNU_verneed 0x6ffffffe /* Version needs section. */
+#define SHT_GNU_versym 0x6fffffff /* Version symbol table. */
+#define SHT_HISUNW 0x6fffffff /* Sun-specific high bound. */
#define SHT_LOPROC 0x70000000 /* Start of processor-specific */
#define SHT_HIPROC 0x7fffffff /* End of processor-specific */
#define SHT_LOUSER 0x80000000 /* Start of application-specific */
@@ -464,6 +469,20 @@ typedef struct
#define DT_HIPROC 0x7fffffff /* End of processor-specific */
#define DT_PROCNUM DT_MIPS_NUM /* Most used by any processor */
+/* The versioning entry types. The next are defined as part of the
+ GNU extension. */
+#define DT_VERSYM 0x6ffffff0
+
+/* These were chosen by Sun. */
+#define DT_VERDEF 0x6ffffffc /* Address of version definition
+ table */
+#define DT_VERDEFNUM 0x6ffffffd /* Number of version definitions */
+#define DT_VERNEED 0x6ffffffe /* Address of table with needed
+ versions */
+#define DT_VERNEEDNUM 0x6fffffff /* Number of needed versions */
+#define DT_VERSIONTAGIDX(tag) (DT_VERNEEDNUM - (tag)) /* Reverse order! */
+#define DT_VERSIONTAGNUM 16
+
/* Sun added these machine-independent extensions in the "processor-specific"
range. Be compatible. */
#define DT_AUXILIARY 0x7ffffffd /* Shared object to load before self */
@@ -471,6 +490,71 @@ typedef struct
#define DT_EXTRATAGIDX(tag) ((Elf32_Word)-((Elf32_Sword) (tag) <<1>>1)-1)
#define DT_EXTRANUM 3
+/* Version definition sections. */
+
+typedef struct
+{
+ Elf32_Half vd_version; /* Version revision */
+ Elf32_Half vd_flags; /* Version information */
+ Elf32_Half vd_ndx; /* Version Index */
+ Elf32_Half vd_cnt; /* Number of associated aux entries */
+ Elf32_Word vd_hash; /* Version name hash value */
+ Elf32_Word vd_aux; /* Offset in bytes to verdaux array */
+ Elf32_Word vd_next; /* Offset in bytes to next verdef
+ entry */
+} Elf32_Verdef;
+
+/* Legal values for vd_version (version revision). */
+#define VER_DEF_NONE 0 /* No version */
+#define VER_DEF_CURRENT 1 /* Current version */
+#define VER_DEF_NUM 2 /* Given version number */
+
+/* Legal values for vd_flags (version information flags). */
+#define VER_FLG_BASE 0x1 /* Version definition of file itself */
+#define VER_FLG_WEAK 0x2 /* Weak version identifier */
+
+/* Auxialiary version information. */
+
+typedef struct
+{
+ Elf32_Addr vda_name; /* Version or dependency names */
+ Elf32_Word vda_next; /* Offset in bytes to next verdaux
+ entry */
+} Elf32_Verdaux;
+
+/* Version dependency section. */
+
+typedef struct
+{
+ Elf32_Half vn_version; /* Version of structure */
+ Elf32_Half vn_cnt; /* Number of associated aux entries */
+ Elf32_Addr vn_file; /* Offset of filename for this
+ dependency */
+ Elf32_Word vn_aux; /* Offset in bytes to vernaux array */
+ Elf32_Word vn_next; /* Offset in bytes to next verneed
+ entry */
+} Elf32_Verneed;
+
+/* Legal values for vn_version (version revision). */
+#define VER_NEED_NONE 0 /* No version */
+#define VER_NEED_CURRENT 1 /* Current version */
+#define VER_NEED_NUM 2 /* Given version number */
+
+/* Auxiliary needed version information. */
+
+typedef struct
+{
+ Elf32_Word vna_hash; /* Hash value of dependency name */
+ Elf32_Half vna_flags; /* Dependency specific information */
+ Elf32_Half vna_other; /* Unused */
+ Elf32_Addr vna_name; /* Dependency name string offset */
+ Elf32_Word vna_next; /* Offset in bytes to next vernaux
+ entry */
+} Elf32_Vernaux;
+
+/* Legal values for vna_flags. */
+#define VER_FLG_WEAK 0x2 /* Weak verison identifier */
+
/* Auxiliary vector. */
diff --git a/elf/link.h b/elf/link.h
index 95d8f0912d..b05ecca199 100644
--- a/elf/link.h
+++ b/elf/link.h
@@ -99,9 +99,12 @@ struct link_map
[0,DT_NUM) are indexed by the processor-independent tags.
[DT_NUM,DT_NUM+DT_PROCNUM) are indexed by the tag minus DT_LOPROC.
[DT_NUM+DT_PROCNUM,DT_NUM+DT_PROCNUM+DT_EXTRANUM) are indexed
- by DT_EXTRATAGIDX(tagvalue) (see <elf.h>). */
+ by DT_EXTRATAGIDX(tagvalue) and
+ [DT_NUM+DT_PROCNUM+DT_VERSIONTAGNUM,
+ DT_NUM+DT_PROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM)
+ are indexed by DT_EXTRATAGIDX(tagvalue) (see <elf.h>). */
- ElfW(Dyn) *l_info[DT_NUM + DT_PROCNUM + DT_EXTRANUM];
+ ElfW(Dyn) *l_info[DT_NUM + DT_PROCNUM + DT_VERSIONTAGNUM + DT_EXTRANUM];
const ElfW(Phdr) *l_phdr; /* Pointer to program header table in core. */
ElfW(Addr) l_entry; /* Entry point location. */
ElfW(Half) l_phnum; /* Number of program header entries. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 02:22:25 +0000