Init. Copied over heload, made a minimal tester.

src/auditor/auditor-x86_64.c

@@ -0,0 +1,81 @@
+#define _GNU_SOURCE
+
+#include <link.h>
+#include <stdio.h>
+
+unsigned int la_version(unsigned int version) {
+  printf("la_version(): version = %u; LAV_CURRENT = %u\n", version,
+         LAV_CURRENT);
+
+  return LAV_CURRENT;
+}
+
+char *la_objsearch(const char *name, uintptr_t *cookie, unsigned int flag) {
+  printf("la_objsearch(): name = %s; cookie = %p", name, cookie);
+  printf("; flag = %s\n", (flag == LA_SER_ORIG)      ? "LA_SER_ORIG"
+                          : (flag == LA_SER_LIBPATH) ? "LA_SER_LIBPATH"
+                          : (flag == LA_SER_RUNPATH) ? "LA_SER_RUNPATH"
+                          : (flag == LA_SER_DEFAULT) ? "LA_SER_DEFAULT"
+                          : (flag == LA_SER_CONFIG)  ? "LA_SER_CONFIG"
+                          : (flag == LA_SER_SECURE)  ? "LA_SER_SECURE"
+                                                     : "???");
+
+  return (char *)name;
+}
+
+void la_activity(uintptr_t *cookie, unsigned int flag) {
+  printf("la_activity(): cookie = %p; flag = %s\n", cookie,
+         (flag == LA_ACT_CONSISTENT) ? "LA_ACT_CONSISTENT"
+         : (flag == LA_ACT_ADD)      ? "LA_ACT_ADD"
+         : (flag == LA_ACT_DELETE)   ? "LA_ACT_DELETE"
+                                     : "???");
+}
+
+unsigned int la_objopen(struct link_map *map, Lmid_t lmid, uintptr_t *cookie) {
+  printf("la_objopen(): loading \"%s\"; lmid = %s; cookie=%p\n", map->l_name,
+         (lmid == LM_ID_BASE)    ? "LM_ID_BASE"
+         : (lmid == LM_ID_NEWLM) ? "LM_ID_NEWLM"
+                                 : "???",
+         cookie);
+
+  return LA_FLG_BINDTO | LA_FLG_BINDFROM;
+}
+
+unsigned int la_objclose(uintptr_t *cookie) {
+  printf("la_objclose(): %p\n", cookie);
+
+  return 0;
+}
+
+void la_preinit(uintptr_t *cookie) { printf("la_preinit(): %p\n", cookie); }
+
+uintptr_t la_symbind32(Elf32_Sym *sym, unsigned int ndx, uintptr_t *refcook,
+                       uintptr_t *defcook, unsigned int *flags,
+                       const char *symname) {
+  printf("la_symbind64(): symname = %s; sym->st_value = %p\n", symname,
+         sym->st_value);
+  printf("        ndx = %u; flags = %#x", ndx, *flags);
+  printf("; refcook = %p; defcook = %p\n", refcook, defcook);
+
+  return sym->st_value;
+}
+
+uintptr_t la_symbind64(Elf64_Sym *sym, unsigned int ndx, uintptr_t *refcook,
+                       uintptr_t *defcook, unsigned int *flags,
+                       const char *symname) {
+  printf("la_symbind64(): symname = %s; sym->st_value = %p\n", symname,
+         (void*)sym->st_value);
+  printf("        ndx = %u; flags = %#x", ndx, *flags);
+  printf("; refcook = %p; defcook = %p\n", refcook, defcook);
+
+  return sym->st_value;
+}
+
+Elf64_Addr la_i86_gnu_pltenter(Elf64_Sym *sym, unsigned int ndx,
+                               uintptr_t *refcook, uintptr_t *defcook,
+                               La_x86_64_regs *regs, unsigned int *flags,
+                               const char *symname, long *framesizep) {
+  printf("la_x86_64_gnu_pltenter(): %s (%p)\n", symname, (void*)sym->st_value);
+
+  return sym->st_value;
+}

src/auditor/auditor.h

@@ -0,0 +1,26 @@
+#ifndef AUDITOR_H_
+#define AUDITOR_H_
+
+#define _GNU_SOURCE
+#include <link.h>
+#include <stdint.h>
+
+unsigned int la_version(unsigned int version);
+char *la_objsearch(const char *name, uintptr_t *cookie, unsigned int flag);
+void la_activity(uintptr_t *cookie, unsigned int flag);
+unsigned int la_objopen(struct link_map *map, Lmid_t lmid, uintptr_t *cookie);
+unsigned int la_objclose(uintptr_t *cookie);
+void la_preinit(uintptr_t *cookie);
+uintptr_t la_symbind32(Elf32_Sym *sym, unsigned int ndx, uintptr_t *refcook,
+                       uintptr_t *defcook, unsigned int *flags,
+                       const char *symname);
+uintptr_t la_symbind64(Elf64_Sym *sym, unsigned int ndx, uintptr_t *refcook,
+                       uintptr_t *defcook, unsigned int *flags,
+                       const char *symname);
+/* Elf32_Addr la_i86_gnu_pltenter(Elf32_Sym *sym, unsigned int ndx, */
+/*                                uintptr_t *refcook, uintptr_t *defcook, */
+/*                                La_i86_regs *regs, unsigned int *flags, */
+/*                                const char *symname, long *framesizep); */
+
+
+#endif // AUDITOR_H_