diff --git a/libc/bionic/atexit.cpp b/libc/bionic/atexit.cpp
index 5dbf322..dae15e0 100644
--- a/libc/bionic/atexit.cpp
+++ b/libc/bionic/atexit.cpp
@@ -73,8 +73,8 @@
   // restart concurrent __cxa_finalize passes.
   uint64_t total_appends_;
 
-  static size_t page_start_of_index(size_t idx) { return PAGE_START(idx * sizeof(AtexitEntry)); }
-  static size_t page_end_of_index(size_t idx) { return PAGE_END(idx * sizeof(AtexitEntry)); }
+  static size_t page_start_of_index(size_t idx) { return page_start(idx * sizeof(AtexitEntry)); }
+  static size_t page_end_of_index(size_t idx) { return page_end(idx * sizeof(AtexitEntry)); }
 
   // Recompact the array if it will save at least one page of memory at the end.
   bool needs_recompaction() const {
@@ -167,7 +167,7 @@
 // than one.
 bool AtexitArray::next_capacity(size_t capacity, size_t* result) {
   if (capacity == 0) {
-    *result = PAGE_END(sizeof(AtexitEntry)) / sizeof(AtexitEntry);
+    *result = page_end(sizeof(AtexitEntry)) / sizeof(AtexitEntry);
     return true;
   }
   size_t num_bytes;
diff --git a/libc/bionic/bionic_allocator.cpp b/libc/bionic/bionic_allocator.cpp
index 98183d4..53f944f 100644
--- a/libc/bionic/bionic_allocator.cpp
+++ b/libc/bionic/bionic_allocator.cpp
@@ -95,12 +95,10 @@
   return result;
 }
 
-BionicSmallObjectAllocator::BionicSmallObjectAllocator(uint32_t type,
-                                                       size_t block_size)
+BionicSmallObjectAllocator::BionicSmallObjectAllocator(uint32_t type, size_t block_size)
     : type_(type),
       block_size_(block_size),
-      blocks_per_page_((PAGE_SIZE - sizeof(small_object_page_info)) /
-                       block_size),
+      blocks_per_page_((page_size() - sizeof(small_object_page_info)) / block_size),
       free_pages_cnt_(0),
       page_list_(nullptr) {}
 
@@ -157,14 +155,13 @@
   if (page_list_ == page) {
     page_list_ = page->next_page;
   }
-  munmap(page, PAGE_SIZE);
+  munmap(page, page_size());
   free_pages_cnt_--;
 }
 
 void BionicSmallObjectAllocator::free(void* ptr) {
   small_object_page_info* const page =
-      reinterpret_cast<small_object_page_info*>(
-          PAGE_START(reinterpret_cast<uintptr_t>(ptr)));
+      reinterpret_cast<small_object_page_info*>(page_start(reinterpret_cast<uintptr_t>(ptr)));
 
   if (reinterpret_cast<uintptr_t>(ptr) % block_size_ != 0) {
     async_safe_fatal("invalid pointer: %p (block_size=%zd)", ptr, block_size_);
@@ -192,14 +189,13 @@
 }
 
 void BionicSmallObjectAllocator::alloc_page() {
-  void* const map_ptr = mmap(nullptr, PAGE_SIZE, PROT_READ | PROT_WRITE,
-                             MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  void* const map_ptr =
+      mmap(nullptr, page_size(), PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
   if (map_ptr == MAP_FAILED) {
     async_safe_fatal("mmap failed: %s", strerror(errno));
   }
 
-  prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, map_ptr, PAGE_SIZE,
-        "bionic_alloc_small_objects");
+  prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, map_ptr, page_size(), "bionic_alloc_small_objects");
 
   small_object_page_info* const page =
       reinterpret_cast<small_object_page_info*>(map_ptr);
@@ -269,10 +265,10 @@
   size_t header_size = __BIONIC_ALIGN(kPageInfoSize, align);
   size_t allocated_size;
   if (__builtin_add_overflow(header_size, size, &allocated_size) ||
-      PAGE_END(allocated_size) < allocated_size) {
+      page_end(allocated_size) < allocated_size) {
     async_safe_fatal("overflow trying to alloc %zu bytes", size);
   }
-  allocated_size = PAGE_END(allocated_size);
+  allocated_size = page_end(allocated_size);
   void* map_ptr = mmap(nullptr, allocated_size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
                        -1, 0);
 
@@ -317,7 +313,7 @@
 void* BionicAllocator::memalign(size_t align, size_t size) {
   // The Bionic allocator only supports alignment up to one page, which is good
   // enough for ELF TLS.
-  align = MIN(align, PAGE_SIZE);
+  align = MIN(align, page_size());
   align = MAX(align, 16);
   if (!powerof2(align)) {
     align = BIONIC_ROUND_UP_POWER_OF_2(align);
@@ -327,7 +323,7 @@
 }
 
 inline page_info* BionicAllocator::get_page_info_unchecked(void* ptr) {
-  uintptr_t header_page = PAGE_START(reinterpret_cast<size_t>(ptr) - kPageInfoSize);
+  uintptr_t header_page = page_start(reinterpret_cast<size_t>(ptr) - kPageInfoSize);
   return reinterpret_cast<page_info*>(header_page);
 }
 
diff --git a/libc/bionic/bionic_elf_tls.cpp b/libc/bionic/bionic_elf_tls.cpp
index 79893e3..077f310 100644
--- a/libc/bionic/bionic_elf_tls.cpp
+++ b/libc/bionic/bionic_elf_tls.cpp
@@ -34,10 +34,11 @@
 #include <sys/param.h>
 #include <unistd.h>
 
+#include "platform/bionic/macros.h"
+#include "platform/bionic/page.h"
 #include "private/ScopedRWLock.h"
 #include "private/ScopedSignalBlocker.h"
 #include "private/bionic_globals.h"
-#include "platform/bionic/macros.h"
 #include "private/bionic_tls.h"
 #include "pthread_internal.h"
 
@@ -81,7 +82,7 @@
     return false;
   }
   // Bionic only respects TLS alignment up to one page.
-  *alignment = MIN(*alignment, PAGE_SIZE);
+  *alignment = MIN(*alignment, page_size());
   return true;
 }
 
diff --git a/libc/bionic/fdsan.cpp b/libc/bionic/fdsan.cpp
index 6433b59..3eb8c19 100644
--- a/libc/bionic/fdsan.cpp
+++ b/libc/bionic/fdsan.cpp
@@ -40,6 +40,7 @@
 #include <unistd.h>
 
 #include <async_safe/log.h>
+#include <platform/bionic/page.h>
 #include <platform/bionic/reserved_signals.h>
 #include <sys/system_properties.h>
 
@@ -80,7 +81,7 @@
 
     size_t required_count = max - inline_fds;
     size_t required_size = sizeof(FdTableOverflow) + required_count * sizeof(FdEntry);
-    size_t aligned_size = __BIONIC_ALIGN(required_size, PAGE_SIZE);
+    size_t aligned_size = __BIONIC_ALIGN(required_size, page_size());
     size_t aligned_count = (aligned_size - sizeof(FdTableOverflow)) / sizeof(FdEntry);
 
     void* allocation =
diff --git a/libc/bionic/getpagesize.cpp b/libc/bionic/getpagesize.cpp
index 3a59900..da97633 100644
--- a/libc/bionic/getpagesize.cpp
+++ b/libc/bionic/getpagesize.cpp
@@ -27,9 +27,10 @@
  */
 
 #include <unistd.h>
+#include "platform/bionic/page.h"
 
 // Portable code should use sysconf(_SC_PAGE_SIZE) directly instead.
 int getpagesize() {
   // We dont use sysconf(3) here because that drags in stdio, which makes static binaries fat.
-  return PAGE_SIZE;
+  return page_size();
 }
diff --git a/libc/bionic/libc_init_static.cpp b/libc/bionic/libc_init_static.cpp
index d64d402..3b0ab82 100644
--- a/libc/bionic/libc_init_static.cpp
+++ b/libc/bionic/libc_init_static.cpp
@@ -129,8 +129,8 @@
       continue;
     }
 
-    ElfW(Addr) seg_page_start = PAGE_START(phdr->p_vaddr);
-    ElfW(Addr) seg_page_end = PAGE_END(phdr->p_vaddr + phdr->p_memsz);
+    ElfW(Addr) seg_page_start = page_start(phdr->p_vaddr);
+    ElfW(Addr) seg_page_end = page_end(phdr->p_vaddr + phdr->p_memsz);
 
     // Check return value here? What do we do if we fail?
     mprotect(reinterpret_cast<void*>(seg_page_start), seg_page_end - seg_page_start, PROT_READ);
@@ -354,9 +354,9 @@
       __libc_shared_globals()->initial_memtag_stack = memtag_stack;
 
       if (memtag_stack) {
-        void* page_start =
-            reinterpret_cast<void*>(PAGE_START(reinterpret_cast<uintptr_t>(stack_top)));
-        if (mprotect(page_start, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_MTE | PROT_GROWSDOWN)) {
+        void* pg_start =
+            reinterpret_cast<void*>(page_start(reinterpret_cast<uintptr_t>(stack_top)));
+        if (mprotect(pg_start, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_MTE | PROT_GROWSDOWN)) {
           async_safe_fatal("error: failed to set PROT_MTE on main thread stack: %s\n",
                            strerror(errno));
         }
diff --git a/libc/bionic/mmap.cpp b/libc/bionic/mmap.cpp
index ed6b9c6..f05dcb8 100644
--- a/libc/bionic/mmap.cpp
+++ b/libc/bionic/mmap.cpp
@@ -32,6 +32,7 @@
 #include <unistd.h>
 
 #include "platform/bionic/macros.h"
+#include "platform/bionic/page.h"
 #include "private/ErrnoRestorer.h"
 
 // mmap2(2) is like mmap(2), but the offset is in 4096-byte blocks, not bytes.
@@ -46,7 +47,7 @@
   }
 
   // Prevent allocations large enough for `end - start` to overflow.
-  size_t rounded = __BIONIC_ALIGN(size, PAGE_SIZE);
+  size_t rounded = __BIONIC_ALIGN(size, page_size());
   if (rounded < size || rounded > PTRDIFF_MAX) {
     errno = ENOMEM;
     return MAP_FAILED;
diff --git a/libc/bionic/mremap.cpp b/libc/bionic/mremap.cpp
index d7c9353..88ec829 100644
--- a/libc/bionic/mremap.cpp
+++ b/libc/bionic/mremap.cpp
@@ -33,12 +33,13 @@
 #include <unistd.h>
 
 #include "platform/bionic/macros.h"
+#include "platform/bionic/page.h"
 
 extern "C" void* __mremap(void*, size_t, size_t, int, void*);
 
 void* mremap(void* old_address, size_t old_size, size_t new_size, int flags, ...) {
   // prevent allocations large enough for `end - start` to overflow
-  size_t rounded = __BIONIC_ALIGN(new_size, PAGE_SIZE);
+  size_t rounded = __BIONIC_ALIGN(new_size, page_size());
   if (rounded < new_size || rounded > PTRDIFF_MAX) {
     errno = ENOMEM;
     return MAP_FAILED;
diff --git a/libc/bionic/pthread_attr.cpp b/libc/bionic/pthread_attr.cpp
index 89aa289..cdae72c 100644
--- a/libc/bionic/pthread_attr.cpp
+++ b/libc/bionic/pthread_attr.cpp
@@ -36,8 +36,9 @@
 
 #include <async_safe/log.h>
 
-#include "private/bionic_defs.h"
+#include "platform/bionic/page.h"
 #include "private/ErrnoRestorer.h"
+#include "private/bionic_defs.h"
 #include "pthread_internal.h"
 
 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
@@ -143,10 +144,10 @@
 
 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
 int pthread_attr_setstack(pthread_attr_t* attr, void* stack_base, size_t stack_size) {
-  if ((stack_size & (PAGE_SIZE - 1) || stack_size < PTHREAD_STACK_MIN)) {
+  if ((stack_size & (page_size() - 1) || stack_size < PTHREAD_STACK_MIN)) {
     return EINVAL;
   }
-  if (reinterpret_cast<uintptr_t>(stack_base) & (PAGE_SIZE - 1)) {
+  if (reinterpret_cast<uintptr_t>(stack_base) & (page_size() - 1)) {
     return EINVAL;
   }
   attr->stack_base = stack_base;
diff --git a/libc/bionic/pthread_create.cpp b/libc/bionic/pthread_create.cpp
index 844f9d8..b46c6cf 100644
--- a/libc/bionic/pthread_create.cpp
+++ b/libc/bionic/pthread_create.cpp
@@ -42,6 +42,7 @@
 
 #include "platform/bionic/macros.h"
 #include "platform/bionic/mte.h"
+#include "platform/bionic/page.h"
 #include "private/ErrnoRestorer.h"
 #include "private/ScopedRWLock.h"
 #include "private/bionic_constants.h"
@@ -71,7 +72,7 @@
 // Allocate a temporary bionic_tls that the dynamic linker's main thread can
 // use while it's loading the initial set of ELF modules.
 bionic_tls* __allocate_temp_bionic_tls() {
-  size_t allocation_size = __BIONIC_ALIGN(sizeof(bionic_tls), PAGE_SIZE);
+  size_t allocation_size = __BIONIC_ALIGN(sizeof(bionic_tls), page_size());
   void* allocation = mmap(nullptr, allocation_size,
                           PROT_READ | PROT_WRITE,
                           MAP_PRIVATE | MAP_ANONYMOUS,
@@ -84,7 +85,7 @@
 }
 
 void __free_temp_bionic_tls(bionic_tls* tls) {
-  munmap(tls, __BIONIC_ALIGN(sizeof(bionic_tls), PAGE_SIZE));
+  munmap(tls, __BIONIC_ALIGN(sizeof(bionic_tls), page_size()));
 }
 
 static void __init_alternate_signal_stack(pthread_internal_t* thread) {
@@ -203,12 +204,11 @@
   return 0;
 }
 
-
 // Allocate a thread's primary mapping. This mapping includes static TLS and
 // optionally a stack. Static TLS includes ELF TLS segments and the bionic_tls
 // struct.
 //
-// The stack_guard_size must be a multiple of the PAGE_SIZE.
+// The stack_guard_size must be a multiple of the page_size().
 ThreadMapping __allocate_thread_mapping(size_t stack_size, size_t stack_guard_size) {
   const StaticTlsLayout& layout = __libc_shared_globals()->static_tls_layout;
 
@@ -220,7 +220,7 @@
 
   // Align the result to a page size.
   const size_t unaligned_size = mmap_size;
-  mmap_size = __BIONIC_ALIGN(mmap_size, PAGE_SIZE);
+  mmap_size = __BIONIC_ALIGN(mmap_size, page_size());
   if (mmap_size < unaligned_size) return {};
 
   // Create a new private anonymous map. Make the entire mapping PROT_NONE, then carve out a
@@ -271,9 +271,9 @@
   if (attr->stack_base == nullptr) {
     // The caller didn't provide a stack, so allocate one.
 
-    // Make sure the guard size is a multiple of PAGE_SIZE.
+    // Make sure the guard size is a multiple of page_size().
     const size_t unaligned_guard_size = attr->guard_size;
-    attr->guard_size = __BIONIC_ALIGN(attr->guard_size, PAGE_SIZE);
+    attr->guard_size = __BIONIC_ALIGN(attr->guard_size, page_size());
     if (attr->guard_size < unaligned_guard_size) return EAGAIN;
 
     mapping = __allocate_thread_mapping(attr->stack_size, attr->guard_size);
diff --git a/libc/bionic/sysconf.cpp b/libc/bionic/sysconf.cpp
index 1c06c9e..3906e2e 100644
--- a/libc/bionic/sysconf.cpp
+++ b/libc/bionic/sysconf.cpp
@@ -38,6 +38,7 @@
 #include <time.h>
 #include <unistd.h>
 
+#include "platform/bionic/page.h"
 #include "private/bionic_tls.h"
 
 static long __sysconf_rlimit(int resource) {
diff --git a/libc/bionic/sysinfo.cpp b/libc/bionic/sysinfo.cpp
index 1e4a0e8..79fd55e 100644
--- a/libc/bionic/sysinfo.cpp
+++ b/libc/bionic/sysinfo.cpp
@@ -33,8 +33,9 @@
 #include <string.h>
 #include <unistd.h>
 
-#include "private/get_cpu_count_from_string.h"
+#include "platform/bionic/page.h"
 #include "private/ScopedReaddir.h"
+#include "private/get_cpu_count_from_string.h"
 
 int __get_cpu_count(const char* sys_file) {
   int cpu_count = 1;
@@ -64,11 +65,11 @@
 long get_phys_pages() {
   struct sysinfo si;
   sysinfo(&si);
-  return (static_cast<int64_t>(si.totalram) * si.mem_unit) / PAGE_SIZE;
+  return (static_cast<int64_t>(si.totalram) * si.mem_unit) / page_size();
 }
 
 long get_avphys_pages() {
   struct sysinfo si;
   sysinfo(&si);
-  return ((static_cast<int64_t>(si.freeram) + si.bufferram) * si.mem_unit) / PAGE_SIZE;
+  return ((static_cast<int64_t>(si.freeram) + si.bufferram) * si.mem_unit) / page_size();
 }
diff --git a/libc/include/bits/fortify/string.h b/libc/include/bits/fortify/string.h
index f668b9f..3dc1cca 100644
--- a/libc/include/bits/fortify/string.h
+++ b/libc/include/bits/fortify/string.h
@@ -30,20 +30,20 @@
 #error "Never include this file directly; instead, include <string.h>"
 #endif
 
-void* __memchr_chk(const void*, int, size_t, size_t) __INTRODUCED_IN(23);
-void* __memrchr_chk(const void*, int, size_t, size_t) __INTRODUCED_IN(23);
-char* __stpncpy_chk2(char*, const char*, size_t, size_t, size_t) __INTRODUCED_IN(21);
-char* __strncpy_chk2(char*, const char*, size_t, size_t, size_t) __INTRODUCED_IN(21);
-size_t __strlcpy_chk(char*, const char*, size_t, size_t) __INTRODUCED_IN(17);
-size_t __strlcat_chk(char*, const char*, size_t, size_t) __INTRODUCED_IN(17);
+void* _Nullable __memchr_chk(const void* _Nonnull, int, size_t, size_t) __INTRODUCED_IN(23);
+void* _Nullable __memrchr_chk(const void* _Nonnull, int, size_t, size_t) __INTRODUCED_IN(23);
+char* _Nonnull __stpncpy_chk2(char* _Nonnull, const char* _Nonnull, size_t, size_t, size_t) __INTRODUCED_IN(21);
+char* _Nonnull __strncpy_chk2(char* _Nonnull, const char* _Nonnull, size_t, size_t, size_t) __INTRODUCED_IN(21);
+size_t __strlcpy_chk(char* _Nonnull, const char* _Nonnull, size_t, size_t) __INTRODUCED_IN(17);
+size_t __strlcat_chk(char* _Nonnull, const char* _Nonnull, size_t, size_t) __INTRODUCED_IN(17);
 
 #if defined(__BIONIC_FORTIFY)
-extern void* __memrchr_real(const void*, int, size_t) __RENAME(memrchr);
+extern void* _Nullable __memrchr_real(const void* _Nonnull, int, size_t) __RENAME(memrchr);
 
 #if __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
 /* No diag -- clang diagnoses misuses of this on its own.  */
 __BIONIC_FORTIFY_INLINE
-void* memcpy(void* const dst __pass_object_size0, const void* src, size_t copy_amount)
+void* _Nonnull memcpy(void* _Nonnull const dst __pass_object_size0, const void* _Nonnull src, size_t copy_amount)
         __diagnose_as_builtin(__builtin_memcpy, 1, 2, 3)
         __overloadable {
     return __builtin___memcpy_chk(dst, src, copy_amount, __bos0(dst));
@@ -51,7 +51,7 @@
 
 /* No diag -- clang diagnoses misuses of this on its own.  */
 __BIONIC_FORTIFY_INLINE
-void* memmove(void* const dst __pass_object_size0, const void* src, size_t len)
+void* _Nonnull memmove(void* _Nonnull const dst __pass_object_size0, const void* _Nonnull src, size_t len)
         __diagnose_as_builtin(__builtin_memmove, 1, 2, 3)
         __overloadable {
     return __builtin___memmove_chk(dst, src, len, __bos0(dst));
@@ -61,7 +61,7 @@
 #if defined(__USE_GNU)
 #if __ANDROID_API__ >= 30
 __BIONIC_FORTIFY_INLINE
-void* mempcpy(void* const dst __pass_object_size0, const void* src, size_t copy_amount)
+void* _Nonnull mempcpy(void* _Nonnull const dst __pass_object_size0, const void* _Nonnull src, size_t copy_amount)
         __diagnose_as_builtin(__builtin_mempcpy, 1, 2, 3)
         __overloadable
         __clang_error_if(__bos_unevaluated_lt(__bos0(dst), copy_amount),
@@ -78,7 +78,7 @@
 #endif /* __USE_GNU */
 
 __BIONIC_FORTIFY_INLINE
-char* stpcpy(char* const dst __pass_object_size, const char* src)
+char* _Nonnull stpcpy(char* _Nonnull const dst __pass_object_size, const char* _Nonnull src)
         __overloadable
         __clang_error_if(__bos_unevaluated_le(__bos(dst), __builtin_strlen(src)),
                          "'stpcpy' called with string bigger than buffer") {
@@ -90,7 +90,7 @@
 }
 
 __BIONIC_FORTIFY_INLINE
-char* strcpy(char* const dst __pass_object_size, const char* src)
+char* _Nonnull strcpy(char* _Nonnull const dst __pass_object_size, const char* _Nonnull src)
         __diagnose_as_builtin(__builtin_strcpy, 1, 2)
         __overloadable
         __clang_error_if(__bos_unevaluated_le(__bos(dst), __builtin_strlen(src)),
@@ -103,7 +103,7 @@
 }
 
 __BIONIC_FORTIFY_INLINE
-char* strcat(char* const dst __pass_object_size, const char* src)
+char* _Nonnull strcat(char* _Nonnull const dst __pass_object_size, const char* _Nonnull src)
         __overloadable
         __clang_error_if(__bos_unevaluated_le(__bos(dst), __builtin_strlen(src)),
                          "'strcat' called with string bigger than buffer") {
@@ -117,7 +117,7 @@
 #if __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
 /* No diag -- clang diagnoses misuses of this on its own.  */
 __BIONIC_FORTIFY_INLINE
-char* strncat(char* const dst __pass_object_size, const char* src, size_t n)
+char* _Nonnull strncat(char* _Nonnull const dst __pass_object_size, const char* _Nonnull src, size_t n)
        __diagnose_as_builtin(__builtin_strncat, 1, 2, 3)
        __overloadable {
     return __builtin___strncat_chk(dst, src, n, __bos(dst));
@@ -126,7 +126,7 @@
 
 /* No diag -- clang diagnoses misuses of this on its own.  */
 __BIONIC_FORTIFY_INLINE
-void* memset(void* const s __pass_object_size0, int c, size_t n) __overloadable
+void* _Nonnull memset(void* _Nonnull const s __pass_object_size0, int c, size_t n) __overloadable
         __diagnose_as_builtin(__builtin_memset, 1, 2, 3)
         /* If you're a user who wants this warning to go away: use `(&memset)(foo, bar, baz)`. */
         __clang_warning_if(c && !n, "'memset' will set 0 bytes; maybe the arguments got flipped?") {
@@ -139,7 +139,7 @@
 
 #if __ANDROID_API__ >= 23 && __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
 __BIONIC_FORTIFY_INLINE
-void* memchr(const void* const s __pass_object_size, int c, size_t n) __overloadable {
+void* _Nullable memchr(const void* _Nonnull const s __pass_object_size, int c, size_t n) __overloadable {
     size_t bos = __bos(s);
 
     if (__bos_trivially_ge(bos, n)) {
@@ -150,7 +150,7 @@
 }
 
 __BIONIC_FORTIFY_INLINE
-void* __memrchr_fortify(const void* const __pass_object_size s, int c, size_t n) __overloadable {
+void* _Nullable __memrchr_fortify(const void* _Nonnull const __pass_object_size s, int c, size_t n) __overloadable {
     size_t bos = __bos(s);
 
     if (__bos_trivially_ge(bos, n)) {
@@ -164,7 +164,7 @@
 #if __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
 /* No diag -- clang diagnoses misuses of this on its own.  */
 __BIONIC_FORTIFY_INLINE
-char* stpncpy(char* const dst __pass_object_size, const char* const src __pass_object_size, size_t n)
+char* _Nonnull stpncpy(char* _Nonnull const dst __pass_object_size, const char* _Nonnull const src __pass_object_size, size_t n)
         __diagnose_as_builtin(__builtin_stpncpy, 1, 2, 3)
         __overloadable {
     size_t bos_dst = __bos(dst);
@@ -180,7 +180,7 @@
 
 /* No diag -- clang diagnoses misuses of this on its own.  */
 __BIONIC_FORTIFY_INLINE
-char* strncpy(char* const dst __pass_object_size, const char* const src __pass_object_size, size_t n)
+char* _Nonnull strncpy(char* _Nonnull const dst __pass_object_size, const char* _Nonnull const src __pass_object_size, size_t n)
         __diagnose_as_builtin(__builtin_strncpy, 1, 2, 3)
         __overloadable {
     size_t bos_dst = __bos(dst);
@@ -196,7 +196,7 @@
 #endif
 
 __BIONIC_FORTIFY_INLINE
-size_t strlcpy(char* const dst __pass_object_size, const char* src, size_t size)
+size_t strlcpy(char* _Nonnull const dst __pass_object_size, const char* _Nonnull src, size_t size)
         __overloadable
         __clang_error_if(__bos_unevaluated_lt(__bos(dst), size),
                          "'strlcpy' called with size bigger than buffer") {
@@ -208,7 +208,7 @@
 }
 
 __BIONIC_FORTIFY_INLINE
-size_t strlcat(char* const dst __pass_object_size, const char* src, size_t size)
+size_t strlcat(char* _Nonnull const dst __pass_object_size, const char* _Nonnull src, size_t size)
         __overloadable
         __clang_error_if(__bos_unevaluated_lt(__bos(dst), size),
                          "'strlcat' called with size bigger than buffer") {
@@ -221,13 +221,13 @@
 
 #if __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
 __BIONIC_FORTIFY_INLINE
-size_t strlen(const char* const s __pass_object_size0) __overloadable {
+size_t strlen(const char* _Nonnull const s __pass_object_size0) __overloadable {
     return __strlen_chk(s, __bos0(s));
 }
 #endif
 
 __BIONIC_FORTIFY_INLINE
-char* strchr(const char* const s __pass_object_size, int c) __overloadable {
+char* _Nullable strchr(const char* _Nonnull const s __pass_object_size, int c) __overloadable {
 #if __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
     size_t bos = __bos(s);
 
@@ -239,7 +239,7 @@
 }
 
 __BIONIC_FORTIFY_INLINE
-char* strrchr(const char* const s __pass_object_size, int c) __overloadable {
+char* _Nullable strrchr(const char* _Nonnull const s __pass_object_size, int c) __overloadable {
 #if __BIONIC_FORTIFY_RUNTIME_CHECKS_ENABLED
     size_t bos = __bos(s);
 
@@ -254,18 +254,18 @@
 #if defined(__cplusplus)
 extern "C++" {
 __BIONIC_FORTIFY_INLINE
-void* memrchr(void* const __pass_object_size s, int c, size_t n) {
+void* _Nullable memrchr(void* _Nonnull const __pass_object_size s, int c, size_t n) {
     return __memrchr_fortify(s, c, n);
 }
 
 __BIONIC_FORTIFY_INLINE
-const void* memrchr(const void* const __pass_object_size s, int c, size_t n) {
+const void* _Nullable memrchr(const void* _Nonnull const __pass_object_size s, int c, size_t n) {
     return __memrchr_fortify(s, c, n);
 }
 }
 #else
 __BIONIC_FORTIFY_INLINE
-void* memrchr(const void* const __pass_object_size s, int c, size_t n) __overloadable {
+void* _Nullable memrchr(const void* _Nonnull const __pass_object_size s, int c, size_t n) __overloadable {
     return __memrchr_fortify(s, c, n);
 }
 #endif
diff --git a/libc/include/bits/fortify/strings.h b/libc/include/bits/fortify/strings.h
index 5515ef9..a36f02c 100644
--- a/libc/include/bits/fortify/strings.h
+++ b/libc/include/bits/fortify/strings.h
@@ -29,7 +29,7 @@
 #if defined(__BIONIC_FORTIFY)
 
 __BIONIC_FORTIFY_INLINE
-void __bionic_bcopy(const void *src, void* const dst __pass_object_size0, size_t len)
+void __bionic_bcopy(const void * _Nonnull src, void* _Nonnull const dst __pass_object_size0, size_t len)
         __overloadable
         __clang_error_if(__bos_unevaluated_lt(__bos0(dst), len),
                          "'bcopy' called with size bigger than buffer") {
@@ -44,7 +44,7 @@
 }
 
 __BIONIC_FORTIFY_INLINE
-void __bionic_bzero(void* const b __pass_object_size0, size_t len)
+void __bionic_bzero(void* _Nonnull const b __pass_object_size0, size_t len)
         __overloadable
         __clang_error_if(__bos_unevaluated_lt(__bos0(b), len),
                          "'bzero' called with size bigger than buffer") {
diff --git a/libc/include/iconv.h b/libc/include/iconv.h
index 7cf36dc..794a292 100644
--- a/libc/include/iconv.h
+++ b/libc/include/iconv.h
@@ -54,7 +54,7 @@
  *
  * Available since API level 28.
  */
-iconv_t _Nonnull iconv_open(const char* _Nonnull __src_encoding, const char* _Nonnull __dst_encoding) __INTRODUCED_IN(28);
+iconv_t _Nonnull iconv_open(const char* _Nonnull __dst_encoding, const char* _Nonnull __src_encoding) __INTRODUCED_IN(28);
 
 /**
  * [iconv(3)](http://man7.org/linux/man-pages/man3/iconv.3.html) converts characters from one
diff --git a/libc/platform/bionic/page.h b/libc/platform/bionic/page.h
index d063a98..5f4bb6f 100644
--- a/libc/platform/bionic/page.h
+++ b/libc/platform/bionic/page.h
@@ -16,15 +16,39 @@
 
 #pragma once
 
-// Get PAGE_SIZE and PAGE_MASK.
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/auxv.h>
+
+// For PAGE_SIZE.
 #include <sys/user.h>
 
+inline size_t page_size() {
+  /*
+   * PAGE_SIZE defines the maximum supported page size. Since 4096 is the
+   * minimum supported page size we can just let it be constant folded if it's
+   * also the maximum.
+   */
+#if PAGE_SIZE == 4096
+  return PAGE_SIZE;
+#else
+  static size_t size = getauxval(AT_PAGESZ);
+  return size;
+#endif
+}
+
 // Returns the address of the page containing address 'x'.
-#define PAGE_START(x) ((x) & PAGE_MASK)
+inline uintptr_t page_start(uintptr_t x) {
+  return x & ~(page_size() - 1);
+}
 
 // Returns the offset of address 'x' in its page.
-#define PAGE_OFFSET(x) ((x) & ~PAGE_MASK)
+inline uintptr_t page_offset(uintptr_t x) {
+  return x & (page_size() - 1);
+}
 
 // Returns the address of the next page after address 'x', unless 'x' is
 // itself at the start of a page.
-#define PAGE_END(x) PAGE_START((x) + (PAGE_SIZE-1))
+inline uintptr_t page_end(uintptr_t x) {
+  return page_start(x + page_size() - 1);
+}
diff --git a/linker/linker.cpp b/linker/linker.cpp
index 17b574f..5c26944 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -962,7 +962,7 @@
   }
 
   // Check if it is properly stored
-  if (entry.method != kCompressStored || (entry.offset % PAGE_SIZE) != 0) {
+  if (entry.method != kCompressStored || (entry.offset % page_size()) != 0) {
     close(fd);
     return -1;
   }
@@ -1171,7 +1171,7 @@
          "load_library(ns=%s, task=%s, flags=0x%x, realpath=%s, search_linked_namespaces=%d)",
          ns->get_name(), name, rtld_flags, realpath.c_str(), search_linked_namespaces);
 
-  if ((file_offset % PAGE_SIZE) != 0) {
+  if ((file_offset % page_size()) != 0) {
     DL_OPEN_ERR("file offset for the library \"%s\" is not page-aligned: %" PRId64, name, file_offset);
     return false;
   }
diff --git a/linker/linker_cfi.cpp b/linker/linker_cfi.cpp
index 6bc2615..247a25d 100644
--- a/linker/linker_cfi.cpp
+++ b/linker/linker_cfi.cpp
@@ -50,8 +50,8 @@
   ShadowWrite(uint16_t* s, uint16_t* e) {
     shadow_start = reinterpret_cast<char*>(s);
     shadow_end = reinterpret_cast<char*>(e);
-    aligned_start = reinterpret_cast<char*>(PAGE_START(reinterpret_cast<uintptr_t>(shadow_start)));
-    aligned_end = reinterpret_cast<char*>(PAGE_END(reinterpret_cast<uintptr_t>(shadow_end)));
+    aligned_start = reinterpret_cast<char*>(page_start(reinterpret_cast<uintptr_t>(shadow_start)));
+    aligned_end = reinterpret_cast<char*>(page_end(reinterpret_cast<uintptr_t>(shadow_end)));
     tmp_start =
         reinterpret_cast<char*>(mmap(nullptr, aligned_end - aligned_start, PROT_READ | PROT_WRITE,
                                      MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
@@ -204,7 +204,7 @@
   shadow_start = reinterpret_cast<uintptr_t* (*)(uintptr_t)>(cfi_init)(p);
   CHECK(shadow_start != nullptr);
   CHECK(*shadow_start == p);
-  mprotect(shadow_start, PAGE_SIZE, PROT_READ);
+  mprotect(shadow_start, page_size(), PROT_READ);
   return true;
 }
 
diff --git a/linker/linker_main.cpp b/linker/linker_main.cpp
index 26e2228..f7c8ea9 100644
--- a/linker/linker_main.cpp
+++ b/linker/linker_main.cpp
@@ -580,8 +580,8 @@
     }
 
     ElfW(Addr) seg_start = phdr->p_vaddr + si->load_bias;
-    ElfW(Addr) seg_page_end = PAGE_END(seg_start + phdr->p_memsz);
-    ElfW(Addr) seg_file_end = PAGE_END(seg_start + phdr->p_filesz);
+    ElfW(Addr) seg_page_end = page_end(seg_start + phdr->p_memsz);
+    ElfW(Addr) seg_file_end = page_end(seg_start + phdr->p_filesz);
 
     if (seg_page_end > seg_file_end) {
       prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME,
diff --git a/linker/linker_mapped_file_fragment.cpp b/linker/linker_mapped_file_fragment.cpp
index cbe5f66..6be1b2b 100644
--- a/linker/linker_mapped_file_fragment.cpp
+++ b/linker/linker_mapped_file_fragment.cpp
@@ -29,6 +29,7 @@
 #include "linker_mapped_file_fragment.h"
 #include "linker_debug.h"
 #include "linker_utils.h"
+#include "platform/bionic/page.h"
 
 #include <inttypes.h>
 #include <stdlib.h>
diff --git a/linker/linker_phdr.cpp b/linker/linker_phdr.cpp
index 73cfced..97ae709 100644
--- a/linker/linker_phdr.cpp
+++ b/linker/linker_phdr.cpp
@@ -116,7 +116,7 @@
   can only memory-map at page boundaries, this means that the bias is
   computed as:
 
-       load_bias = phdr0_load_address - PAGE_START(phdr0->p_vaddr)
+       load_bias = phdr0_load_address - page_start(phdr0->p_vaddr)
 
   (NOTE: The value must be used as a 32-bit unsigned integer, to deal with
           possible wrap around UINT32_MAX for possible large p_vaddr values).
@@ -124,11 +124,11 @@
   And that the phdr0_load_address must start at a page boundary, with
   the segment's real content starting at:
 
-       phdr0_load_address + PAGE_OFFSET(phdr0->p_vaddr)
+       phdr0_load_address + page_offset(phdr0->p_vaddr)
 
   Note that ELF requires the following condition to make the mmap()-ing work:
 
-      PAGE_OFFSET(phdr0->p_vaddr) == PAGE_OFFSET(phdr0->p_offset)
+      page_offset(phdr0->p_vaddr) == page_offset(phdr0->p_offset)
 
   The load_bias must be added to any p_vaddr value read from the ELF file to
   determine the corresponding memory address.
@@ -529,8 +529,8 @@
     min_vaddr = 0;
   }
 
-  min_vaddr = PAGE_START(min_vaddr);
-  max_vaddr = PAGE_END(max_vaddr);
+  min_vaddr = page_start(min_vaddr);
+  max_vaddr = page_end(max_vaddr);
 
   if (out_min_vaddr != nullptr) {
     *out_min_vaddr = min_vaddr;
@@ -545,7 +545,7 @@
 // program header table. Used to determine whether the file should be loaded at
 // a specific virtual address alignment for use with huge pages.
 size_t phdr_table_get_maximum_alignment(const ElfW(Phdr)* phdr_table, size_t phdr_count) {
-  size_t maximum_alignment = PAGE_SIZE;
+  size_t maximum_alignment = page_size();
 
   for (size_t i = 0; i < phdr_count; ++i) {
     const ElfW(Phdr)* phdr = &phdr_table[i];
@@ -563,7 +563,7 @@
 #if defined(__LP64__)
   return maximum_alignment;
 #else
-  return PAGE_SIZE;
+  return page_size();
 #endif
 }
 
@@ -574,7 +574,7 @@
   int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
   // Reserve enough space to properly align the library's start address.
   mapping_align = std::max(mapping_align, start_align);
-  if (mapping_align == PAGE_SIZE) {
+  if (mapping_align == page_size()) {
     void* mmap_ptr = mmap(nullptr, size, PROT_NONE, mmap_flags, -1, 0);
     if (mmap_ptr == MAP_FAILED) {
       return nullptr;
@@ -593,7 +593,7 @@
   constexpr size_t kMaxGapUnits = 32;
   // Allocate enough space so that the end of the desired region aligned up is still inside the
   // mapping.
-  size_t mmap_size = align_up(size, mapping_align) + mapping_align - PAGE_SIZE;
+  size_t mmap_size = align_up(size, mapping_align) + mapping_align - page_size();
   uint8_t* mmap_ptr =
       reinterpret_cast<uint8_t*>(mmap(nullptr, mmap_size, PROT_NONE, mmap_flags, -1, 0));
   if (mmap_ptr == MAP_FAILED) {
@@ -610,7 +610,7 @@
     mapping_align = std::max(mapping_align, kGapAlignment);
     gap_size =
         kGapAlignment * (is_first_stage_init() ? 1 : arc4random_uniform(kMaxGapUnits - 1) + 1);
-    mmap_size = align_up(size + gap_size, mapping_align) + mapping_align - PAGE_SIZE;
+    mmap_size = align_up(size + gap_size, mapping_align) + mapping_align - page_size();
     mmap_ptr = reinterpret_cast<uint8_t*>(mmap(nullptr, mmap_size, PROT_NONE, mmap_flags, -1, 0));
     if (mmap_ptr == MAP_FAILED) {
       return nullptr;
@@ -665,12 +665,12 @@
              load_size_ - address_space->reserved_size, load_size_, name_.c_str());
       return false;
     }
-    size_t start_alignment = PAGE_SIZE;
+    size_t start_alignment = page_size();
     if (get_transparent_hugepages_supported() && get_application_target_sdk_version() >= 31) {
       size_t maximum_alignment = phdr_table_get_maximum_alignment(phdr_table_, phdr_num_);
       // Limit alignment to PMD size as other alignments reduce the number of
       // bits available for ASLR for no benefit.
-      start_alignment = maximum_alignment == kPmdSize ? kPmdSize : PAGE_SIZE;
+      start_alignment = maximum_alignment == kPmdSize ? kPmdSize : page_size();
     }
     start = ReserveWithAlignmentPadding(load_size_, kLibraryAlignment, start_alignment, &gap_start_,
                                         &gap_size_);
@@ -706,8 +706,8 @@
     ElfW(Addr) seg_start = phdr->p_vaddr + load_bias_;
     ElfW(Addr) seg_end   = seg_start + phdr->p_memsz;
 
-    ElfW(Addr) seg_page_start = PAGE_START(seg_start);
-    ElfW(Addr) seg_page_end   = PAGE_END(seg_end);
+    ElfW(Addr) seg_page_start = page_start(seg_start);
+    ElfW(Addr) seg_page_end = page_end(seg_end);
 
     ElfW(Addr) seg_file_end   = seg_start + phdr->p_filesz;
 
@@ -715,7 +715,7 @@
     ElfW(Addr) file_start = phdr->p_offset;
     ElfW(Addr) file_end   = file_start + phdr->p_filesz;
 
-    ElfW(Addr) file_page_start = PAGE_START(file_start);
+    ElfW(Addr) file_page_start = page_start(file_start);
     ElfW(Addr) file_length = file_end - file_page_start;
 
     if (file_size_ <= 0) {
@@ -768,11 +768,11 @@
 
     // if the segment is writable, and does not end on a page boundary,
     // zero-fill it until the page limit.
-    if ((phdr->p_flags & PF_W) != 0 && PAGE_OFFSET(seg_file_end) > 0) {
-      memset(reinterpret_cast<void*>(seg_file_end), 0, PAGE_SIZE - PAGE_OFFSET(seg_file_end));
+    if ((phdr->p_flags & PF_W) != 0 && page_offset(seg_file_end) > 0) {
+      memset(reinterpret_cast<void*>(seg_file_end), 0, page_size() - page_offset(seg_file_end));
     }
 
-    seg_file_end = PAGE_END(seg_file_end);
+    seg_file_end = page_end(seg_file_end);
 
     // seg_file_end is now the first page address after the file
     // content. If seg_end is larger, we need to zero anything
@@ -811,8 +811,8 @@
       continue;
     }
 
-    ElfW(Addr) seg_page_start = PAGE_START(phdr->p_vaddr) + load_bias;
-    ElfW(Addr) seg_page_end   = PAGE_END(phdr->p_vaddr + phdr->p_memsz) + load_bias;
+    ElfW(Addr) seg_page_start = page_start(phdr->p_vaddr) + load_bias;
+    ElfW(Addr) seg_page_end = page_end(phdr->p_vaddr + phdr->p_memsz) + load_bias;
 
     int prot = PFLAGS_TO_PROT(phdr->p_flags) | extra_prot_flags;
     if ((prot & PROT_WRITE) != 0) {
@@ -912,8 +912,8 @@
     //       the program is likely to fail at runtime. So in effect the
     //       linker must only emit a PT_GNU_RELRO segment if it ensures
     //       that it starts on a page boundary.
-    ElfW(Addr) seg_page_start = PAGE_START(phdr->p_vaddr) + load_bias;
-    ElfW(Addr) seg_page_end   = PAGE_END(phdr->p_vaddr + phdr->p_memsz) + load_bias;
+    ElfW(Addr) seg_page_start = page_start(phdr->p_vaddr) + load_bias;
+    ElfW(Addr) seg_page_end = page_end(phdr->p_vaddr + phdr->p_memsz) + load_bias;
 
     int ret = mprotect(reinterpret_cast<void*>(seg_page_start),
                        seg_page_end - seg_page_start,
@@ -972,8 +972,8 @@
       continue;
     }
 
-    ElfW(Addr) seg_page_start = PAGE_START(phdr->p_vaddr) + load_bias;
-    ElfW(Addr) seg_page_end   = PAGE_END(phdr->p_vaddr + phdr->p_memsz) + load_bias;
+    ElfW(Addr) seg_page_start = page_start(phdr->p_vaddr) + load_bias;
+    ElfW(Addr) seg_page_end = page_end(phdr->p_vaddr + phdr->p_memsz) + load_bias;
     ssize_t size = seg_page_end - seg_page_start;
 
     ssize_t written = TEMP_FAILURE_RETRY(write(fd, reinterpret_cast<void*>(seg_page_start), size));
@@ -1035,8 +1035,8 @@
       continue;
     }
 
-    ElfW(Addr) seg_page_start = PAGE_START(phdr->p_vaddr) + load_bias;
-    ElfW(Addr) seg_page_end   = PAGE_END(phdr->p_vaddr + phdr->p_memsz) + load_bias;
+    ElfW(Addr) seg_page_start = page_start(phdr->p_vaddr) + load_bias;
+    ElfW(Addr) seg_page_end = page_end(phdr->p_vaddr + phdr->p_memsz) + load_bias;
 
     char* file_base = static_cast<char*>(temp_mapping) + *file_offset;
     char* mem_base = reinterpret_cast<char*>(seg_page_start);
@@ -1053,15 +1053,15 @@
     while (match_offset < size) {
       // Skip over dissimilar pages.
       while (match_offset < size &&
-             memcmp(mem_base + match_offset, file_base + match_offset, PAGE_SIZE) != 0) {
-        match_offset += PAGE_SIZE;
+             memcmp(mem_base + match_offset, file_base + match_offset, page_size()) != 0) {
+        match_offset += page_size();
       }
 
       // Count similar pages.
       size_t mismatch_offset = match_offset;
       while (mismatch_offset < size &&
-             memcmp(mem_base + mismatch_offset, file_base + mismatch_offset, PAGE_SIZE) == 0) {
-        mismatch_offset += PAGE_SIZE;
+             memcmp(mem_base + mismatch_offset, file_base + mismatch_offset, page_size()) == 0) {
+        mismatch_offset += page_size();
       }
 
       // Map over similar pages.
diff --git a/linker/linker_utils.cpp b/linker/linker_utils.cpp
index 29110ed..cd03eed 100644
--- a/linker/linker_utils.cpp
+++ b/linker/linker_utils.cpp
@@ -169,12 +169,6 @@
   return true;
 }
 
-constexpr off64_t kPageMask = ~static_cast<off64_t>(PAGE_SIZE-1);
-
-off64_t page_start(off64_t offset) {
-  return offset & kPageMask;
-}
-
 bool safe_add(off64_t* out, off64_t a, size_t b) {
   CHECK(a >= 0);
   if (static_cast<uint64_t>(INT64_MAX - a) < b) {
@@ -185,10 +179,6 @@
   return true;
 }
 
-size_t page_offset(off64_t offset) {
-  return static_cast<size_t>(offset & (PAGE_SIZE-1));
-}
-
 void split_path(const char* path, const char* delimiters,
                 std::vector<std::string>* paths) {
   if (path != nullptr && path[0] != 0) {
diff --git a/linker/linker_utils.h b/linker/linker_utils.h
index 5073b10..3049e53 100644
--- a/linker/linker_utils.h
+++ b/linker/linker_utils.h
@@ -55,7 +55,5 @@
 
 std::string dirname(const char* path);
 
-off64_t page_start(off64_t offset);
-size_t page_offset(off64_t offset);
 bool safe_add(off64_t* out, off64_t a, size_t b);
 bool is_first_stage_init();
diff --git a/linker/linker_utils_test.cpp b/linker/linker_utils_test.cpp
index 44907da..0b881d4 100644
--- a/linker/linker_utils_test.cpp
+++ b/linker/linker_utils_test.cpp
@@ -33,6 +33,7 @@
 #include <gtest/gtest.h>
 
 #include "linker_utils.h"
+#include "platform/bionic/page.h"
 
 TEST(linker_utils, format_string) {
   std::vector<std::pair<std::string, std::string>> params = {{ "LIB", "lib32"}, { "SDKVER", "42"}};
@@ -104,9 +105,9 @@
 }
 
 TEST(linker_utils, page_start) {
-  ASSERT_EQ(0x0001000, page_start(0x0001000));
-  ASSERT_EQ(0x3002000, page_start(0x300222f));
-  ASSERT_EQ(0x6001000, page_start(0x6001fff));
+  ASSERT_EQ(0x0001000U, page_start(0x0001000));
+  ASSERT_EQ(0x3002000U, page_start(0x300222f));
+  ASSERT_EQ(0x6001000U, page_start(0x6001fff));
 }
 
 TEST(linker_utils, page_offset) {