Clean up DSBT support

The existing DSBT support relies on the kernel to provide DSBT info
as part of the load maps passed to user space. The problem with this
approach is that the DSBT info is in the dynamic section, so the
kernel must access a userspace mapping of the dynamic section (or
separately read a copy for the kernel) in order to retrieve the
information needed by userspace.

This patch reworks the DSBT support to remove the reliance on DSBT
info coming from the kernel. Instead, ldso reads the info itself from
the dynamic section. One other benefit of this is that it allows the
existing kernel FDPIC loader to also load DSBT binaries.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/ldso/include/dl-hash.h b/ldso/include/dl-hash.h
index c7effc588..7bccdca96 100644
--- a/ldso/include/dl-hash.h
+++ b/ldso/include/dl-hash.h
@@ -139,6 +139,12 @@ struct elf_resolve {
      memory when the module is dlclose()d.  */
   struct funcdesc_ht *funcdesc_ht;
 #endif
+#ifdef __DSBT__
+  /* Information for DSBT */
+  void **dsbt_table;
+  unsigned long dsbt_size;
+  unsigned long dsbt_index;
+#endif
 };
 
 #define RELOCS_DONE	    0x000001