summaryrefslogtreecommitdiff
path: root/ldso/include/ldsodefs.h
diff options
context:
space:
mode:
Diffstat (limited to 'ldso/include/ldsodefs.h')
-rw-r--r--ldso/include/ldsodefs.h147
1 files changed, 147 insertions, 0 deletions
diff --git a/ldso/include/ldsodefs.h b/ldso/include/ldsodefs.h
new file mode 100644
index 000000000..432c7b848
--- /dev/null
+++ b/ldso/include/ldsodefs.h
@@ -0,0 +1,147 @@
+#ifndef _LDSODEFS_H
+#define _LDSODEFS_H 1
+
+#include <bits/kernel-features.h>
+
+#include <features.h>
+#include <tls.h>
+
+#ifdef __mips__
+/* The MIPS ABI specifies that the dynamic section has to be read-only. */
+
+#define DL_RO_DYN_SECTION 1
+
+/* TODO: Import in 64-bit relocations from glibc. */
+#endif
+
+#ifndef SHARED
+# define EXTERN extern
+#else
+# ifdef IS_IN_rtld
+# define EXTERN
+# else
+# define EXTERN extern
+# endif
+#endif
+
+/* Non-shared code has no support for multiple namespaces. */
+#ifdef SHARED
+# define DL_NNS 16
+#else
+# define DL_NNS 1
+#endif
+
+#define GL(x) _##x
+#define GLRO(x) _##x
+
+/* Variable pointing to the end of the stack (or close to it). This value
+ must be constant over the runtime of the application. Some programs
+ might use the variable which results in copy relocations on some
+ platforms. But this does not matter, ld.so can always use the local
+ copy. */
+extern void *__libc_stack_end;
+
+/* Determine next available module ID. */
+extern size_t _dl_next_tls_modid (void) internal_function attribute_hidden;
+
+/* Calculate offset of the TLS blocks in the static TLS block. */
+extern void _dl_determine_tlsoffset (void) internal_function attribute_hidden;
+
+/* Set up the data structures for TLS, when they were not set up at startup.
+ Returns nonzero on malloc failure.
+ This is called from _dl_map_object_from_fd or by libpthread. */
+extern int _dl_tls_setup (void) internal_function;
+rtld_hidden_proto (_dl_tls_setup)
+
+/* Allocate memory for static TLS block (unless MEM is nonzero) and dtv. */
+extern void *_dl_allocate_tls (void *mem) internal_function;
+
+/* Get size and alignment requirements of the static TLS block. */
+extern void _dl_get_tls_static_info (size_t *sizep, size_t *alignp)
+ internal_function;
+
+extern void _dl_allocate_static_tls (struct link_map *map)
+ internal_function attribute_hidden;
+
+/* Taken from glibc/elf/dl-reloc.c */
+#define CHECK_STATIC_TLS(sym_map) \
+ do { \
+ if (__builtin_expect ((sym_map)->l_tls_offset == NO_TLS_OFFSET, 0)) \
+ _dl_allocate_static_tls (sym_map); \
+ } while (0)
+
+/* These are internal entry points to the two halves of _dl_allocate_tls,
+ only used within rtld.c itself at startup time. */
+extern void *_dl_allocate_tls_storage (void)
+ internal_function attribute_hidden;
+extern void *_dl_allocate_tls_init (void *) internal_function;
+
+/* Deallocate memory allocated with _dl_allocate_tls. */
+extern void _dl_deallocate_tls (void *tcb, bool dealloc_tcb) internal_function;
+
+extern void _dl_nothread_init_static_tls (struct link_map *) internal_function attribute_hidden;
+
+/* Highest dtv index currently needed. */
+EXTERN size_t _dl_tls_max_dtv_idx;
+/* Flag signalling whether there are gaps in the module ID allocation. */
+EXTERN bool _dl_tls_dtv_gaps;
+/* Information about the dtv slots. */
+EXTERN struct dtv_slotinfo_list
+{
+ size_t len;
+ struct dtv_slotinfo_list *next;
+ struct dtv_slotinfo
+ {
+ size_t gen;
+ bool is_static;
+ struct link_map *map;
+ } slotinfo[0];
+} *_dl_tls_dtv_slotinfo_list;
+/* Number of modules in the static TLS block. */
+EXTERN size_t _dl_tls_static_nelem;
+/* Size of the static TLS block. */
+EXTERN size_t _dl_tls_static_size;
+/* Size actually allocated in the static TLS block. */
+EXTERN size_t _dl_tls_static_used;
+/* Alignment requirement of the static TLS block. */
+EXTERN size_t _dl_tls_static_align;
+/* Function pointer for catching TLS errors. */
+EXTERN void **(*_dl_error_catch_tsd) (void) __attribute__ ((const));
+
+/* Number of additional entries in the slotinfo array of each slotinfo
+ list element. A large number makes it almost certain take we never
+ have to iterate beyond the first element in the slotinfo list. */
+# define TLS_SLOTINFO_SURPLUS (62)
+
+/* Number of additional slots in the dtv allocated. */
+# define DTV_SURPLUS (14)
+
+ /* Initial dtv of the main thread, not allocated with normal malloc. */
+ EXTERN void *_dl_initial_dtv;
+ /* Generation counter for the dtv. */
+ EXTERN size_t _dl_tls_generation;
+
+ EXTERN void (*_dl_init_static_tls) (struct link_map *);
+
+/* We have the auxiliary vector. */
+#define HAVE_AUX_VECTOR
+
+/* We can assume that the kernel always provides the AT_UID, AT_EUID,
+ AT_GID, and AT_EGID values in the auxiliary vector from 2.4.0 or so on. */
+#if __ASSUME_AT_XID
+# define HAVE_AUX_XID
+#endif
+
+/* We can assume that the kernel always provides the AT_SECURE value
+ in the auxiliary vector from 2.5.74 or so on. */
+#if __ASSUME_AT_SECURE
+# define HAVE_AUX_SECURE
+#endif
+
+/* Starting with one of the 2.4.0 pre-releases the Linux kernel passes
+ up the page size information. */
+#if __ASSUME_AT_PAGESIZE
+# define HAVE_AUX_PAGESIZE
+#endif
+
+#endif