diff --git a/lib/libsys/auxv.c b/lib/libsys/auxv.c
--- a/lib/libsys/auxv.c
+++ b/lib/libsys/auxv.c
@@ -76,12 +76,6 @@
 static void *fxrng_seed_version;
 static u_long usrstackbase, usrstacklim;
 
-#ifdef __powerpc__
-static int powerpc_new_auxv_format = 0;
-static void _init_aux_powerpc_fixup(void);
-int _powerpc_elf_aux_info(int, void *, int);
-#endif
-
 /*
  * This function might be called and actual body executed more than
  * once in multithreading environment.  Due to this, it is and must
@@ -172,109 +166,13 @@
 		case AT_USRSTACKLIM:
 			usrstacklim = aux->a_un.a_val;
 			break;
-#ifdef __powerpc__
-		/*
-		 * Since AT_STACKPROT is always set, and the common
-		 * value 23 is mutually exclusive with the legacy powerpc
-		 * value 21, the existence of AT_STACKPROT proves we are
-		 * on the common format.
-		 */
-		case AT_STACKPROT:	/* 23 */
-			powerpc_new_auxv_format = 1;
-			break;
-#endif
 		}
 	}
-#ifdef __powerpc__
-	if (!powerpc_new_auxv_format)
-		_init_aux_powerpc_fixup();
-#endif
 
 	atomic_store_rel_int(&aux_once, 1);
 }
 
-#ifdef __powerpc__
-static void
-_init_aux_powerpc_fixup(void)
-{
-	Elf_Auxinfo *aux;
-
-	/*
-	 * Before 1300070, PowerPC platforms had nonstandard numbering for
-	 * the aux vector. When running old binaries, the kernel will pass
-	 * the vector using the old numbering. Reload affected variables.
-	 */
-	for (aux = __elf_aux_vector; aux->a_type != AT_NULL; aux++) {
-		switch (aux->a_type) {
-		case AT_OLD_CANARY:
-			canary = (char *)(aux->a_un.a_ptr);
-			break;
-		case AT_OLD_CANARYLEN:
-			canary_len = aux->a_un.a_val;
-			break;
-		case AT_OLD_EXECPATH:
-			execpath = (char *)(aux->a_un.a_ptr);
-			break;
-		case AT_OLD_PAGESIZES:
-			pagesizes = (char *)(aux->a_un.a_ptr);
-			break;
-		case AT_OLD_PAGESIZESLEN:
-			pagesizes_len = aux->a_un.a_val;
-			break;
-		case AT_OLD_OSRELDATE:
-			osreldate = aux->a_un.a_val;
-			break;
-		case AT_OLD_NCPUS:
-			ncpus = aux->a_un.a_val;
-			break;
-		}
-	}
-}
-
-int
-_powerpc_elf_aux_info(int aux, void *buf, int buflen)
-{
-
-	/*
-	 * If we are in the old auxv format, we need to translate the aux
-	 * parameter of elf_aux_info() calls into the common auxv format.
-	 * Internal libc calls always use the common format, and they
-	 * directly call _elf_aux_info instead of using the weak symbol.
-	 */
-	if (!powerpc_new_auxv_format) {
-		switch (aux) {
-		case AT_OLD_EXECPATH:
-			aux = AT_EXECPATH;
-			break;
-		case AT_OLD_CANARY:
-			aux = AT_CANARY;
-			break;
-		case AT_OLD_CANARYLEN:
-			aux = AT_CANARYLEN;
-			break;
-		case AT_OLD_OSRELDATE:
-			aux = AT_OSRELDATE;
-			break;
-		case AT_OLD_NCPUS:
-			aux = AT_NCPUS;
-			break;
-		case AT_OLD_PAGESIZES:
-			aux = AT_PAGESIZES;
-			break;
-		case AT_OLD_PAGESIZESLEN:
-			aux = AT_PAGESIZESLEN;
-			break;
-		case AT_OLD_STACKPROT:
-			aux = AT_STACKPROT;
-			break;
-		}
-	}
-	return _elf_aux_info(aux, buf, buflen);
-}
-__weak_reference(_powerpc_elf_aux_info, elf_aux_info);
-#else
 __weak_reference(_elf_aux_info, elf_aux_info);
-#endif
 
 int
 _elf_aux_info(int aux, void *buf, int buflen)
diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -521,9 +521,6 @@
 	char buf[MAXPATHLEN];
 	int argc, fd, i, mib[4], old_osrel, osrel, phnum, rtld_argc;
 	size_t sz;
-#ifdef __powerpc__
-	int old_auxv_format = 1;
-#endif
 	bool dir_enable, dir_ignore, direct_exec, explicit_fd, search_in_path;
 
 	/*
@@ -549,29 +546,8 @@
 	for (auxp = aux; auxp->a_type != AT_NULL; auxp++) {
 		if (auxp->a_type < AT_COUNT)
 			aux_info[auxp->a_type] = auxp;
-#ifdef __powerpc__
-		if (auxp->a_type == 23) /* AT_STACKPROT */
-			old_auxv_format = 0;
-#endif
 	}
 
-#ifdef __powerpc__
-	if (old_auxv_format) {
-		/* Remap from old-style auxv numbers. */
-		aux_info[23] = aux_info[21]; /* AT_STACKPROT */
-		aux_info[21] = aux_info[19]; /* AT_PAGESIZESLEN */
-		aux_info[19] = aux_info[17]; /* AT_NCPUS */
-		aux_info[17] = aux_info[15]; /* AT_CANARYLEN */
-		aux_info[15] = aux_info[13]; /* AT_EXECPATH */
-		aux_info[13] = NULL;	     /* AT_GID */
-
-		aux_info[20] = aux_info[18]; /* AT_PAGESIZES */
-		aux_info[18] = aux_info[16]; /* AT_OSRELDATE */
-		aux_info[16] = aux_info[14]; /* AT_CANARY */
-		aux_info[14] = NULL;	     /* AT_EGID */
-	}
-#endif
-
 	/* Initialize and relocate ourselves. */
 	assert(aux_info[AT_BASE] != NULL);
 	init_rtld((caddr_t)aux_info[AT_BASE]->a_un.a_ptr, aux_info);