diff --git a/libc/arch-arm/bionic/__bionic_clone.S b/libc/arch-arm/bionic/__bionic_clone.S
index 6669b93..3fe212b 100644
--- a/libc/arch-arm/bionic/__bionic_clone.S
+++ b/libc/arch-arm/bionic/__bionic_clone.S
@@ -61,6 +61,8 @@
     b       __set_errno_internal
 
 .L_bc_child:
+    # We're in the child now. Set the end of the frame record chain.
+    mov    fp, #0
     # Setting lr to 0 will make the unwinder stop at __start_thread.
     mov    lr, #0
     # Call __start_thread with the 'fn' and 'arg' we stored on the child stack.
diff --git a/libc/arch-common/bionic/crtbegin.c b/libc/arch-common/bionic/crtbegin.c
index 62878378..5f681c5 100644
--- a/libc/arch-common/bionic/crtbegin.c
+++ b/libc/arch-common/bionic/crtbegin.c
@@ -49,13 +49,15 @@
 #define POST "; .size _start, .-_start"
 
 #if defined(__aarch64__)
-__asm__(PRE "bti j; mov x0,sp; b _start_main" POST);
+__asm__(PRE "bti j; mov x29,#0; mov x30,#0; mov x0,sp; b _start_main" POST);
 #elif defined(__arm__)
-__asm__(PRE "mov r0,sp; b _start_main" POST);
+__asm__(PRE "mov fp,#0; mov lr,#0; mov r0,sp; b _start_main" POST);
 #elif defined(__i386__)
-__asm__(PRE "movl %esp,%eax; andl $~0xf,%esp; subl $12,%esp; pushl %eax; calll _start_main" POST);
+__asm__(PRE
+        "xorl %ebp,%ebp; movl %esp,%eax; andl $~0xf,%esp; subl $12,%esp; pushl %eax;"
+        "calll _start_main" POST);
 #elif defined(__x86_64__)
-__asm__(PRE "movq %rsp,%rdi; andq $~0xf,%rsp; callq _start_main" POST);
+__asm__(PRE "xorl %ebp, %ebp; movq %rsp,%rdi; andq $~0xf,%rsp; callq _start_main" POST);
 #else
 #error unsupported architecture
 #endif
diff --git a/libc/arch-x86/bionic/__bionic_clone.S b/libc/arch-x86/bionic/__bionic_clone.S
index b682b48..f0c58a0 100644
--- a/libc/arch-x86/bionic/__bionic_clone.S
+++ b/libc/arch-x86/bionic/__bionic_clone.S
@@ -45,6 +45,7 @@
 .L_bc_child:
         # We don't want anyone to unwind past this point.
         .cfi_undefined %eip
+        .cfi_undefined %ebp
         call    __start_thread
         hlt
 
diff --git a/linker/Android.bp b/linker/Android.bp
index 3370f28..4a5bf44 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -193,6 +193,7 @@
         "linker_relocate.cpp",
         "linker_sdk_versions.cpp",
         "linker_soinfo.cpp",
+        "linker_transparent_hugepage_support.cpp",
         "linker_tls.cpp",
         "linker_utils.cpp",
         "rt.cpp",
@@ -413,6 +414,19 @@
     bazel_module: { bp2build_available: true },
 }
 
+// Used to generate binaries that can be backed by transparent hugepages.
+cc_defaults {
+    name: "linker_hugepage_aligned",
+    arch: {
+        arm64: {
+            ldflags: ["-z max-page-size=0x200000"],
+        },
+        x86_64: {
+            ldflags: ["-z max-page-size=0x200000"],
+        },
+    },
+}
+
 cc_library {
     // NOTE: --exclude-libs=libgcc.a makes sure that any symbols ld-android.so pulls from
     // libgcc.a are made static to ld-android.so.  This in turn ensures that libraries that
diff --git a/linker/NOTICE b/linker/NOTICE
index 4cada69..8f70d87 100644
--- a/linker/NOTICE
+++ b/linker/NOTICE
@@ -306,3 +306,31 @@
 
 -------------------------------------------------------------------
 
+Copyright (C) 2021 The Android Open Source Project
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+ * Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in
+   the documentation and/or other materials provided with the
+   distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.
+
+-------------------------------------------------------------------
+
diff --git a/linker/linker.h b/linker/linker.h
index e1775fb..74bdcc7 100644
--- a/linker/linker.h
+++ b/linker/linker.h
@@ -110,6 +110,8 @@
 void set_application_target_sdk_version(int target);
 int get_application_target_sdk_version();
 
+bool get_transparent_hugepages_supported();
+
 enum {
   /* A regular namespace is the namespace with a custom search path that does
    * not impose any restrictions on the location of native libraries.
diff --git a/linker/linker_main.cpp b/linker/linker_main.cpp
index 0b501a7..2a690e9 100644
--- a/linker/linker_main.cpp
+++ b/linker/linker_main.cpp
@@ -31,9 +31,10 @@
 #include <link.h>
 #include <sys/auxv.h>
 
+#include "linker.h"
+#include "linker_cfi.h"
 #include "linker_debug.h"
 #include "linker_debuggerd.h"
-#include "linker_cfi.h"
 #include "linker_gdb_support.h"
 #include "linker_globals.h"
 #include "linker_phdr.h"
diff --git a/linker/linker_phdr.cpp b/linker/linker_phdr.cpp
index 9b1b99f..60fd776 100644
--- a/linker/linker_phdr.cpp
+++ b/linker/linker_phdr.cpp
@@ -70,8 +70,9 @@
     p_memsz   -> segment memory size (always >= p_filesz)
     p_vaddr   -> segment's virtual address
     p_flags   -> segment flags (e.g. readable, writable, executable)
+    p_align   -> segment's in-memory and in-file alignment
 
-  We will ignore the p_paddr and p_align fields of ElfW(Phdr) for now.
+  We will ignore the p_paddr field of ElfW(Phdr) for now.
 
   The loadable segments can be seen as a list of [p_vaddr ... p_vaddr+p_memsz)
   ranges of virtual addresses. A few rules apply:
@@ -137,6 +138,9 @@
                                       MAYBE_MAP_FLAG((x), PF_R, PROT_READ) | \
                                       MAYBE_MAP_FLAG((x), PF_W, PROT_WRITE))
 
+// Default PMD size for x86_64 and aarch64 (2MB).
+static constexpr size_t kPmdSize = (1UL << 21);
+
 ElfReader::ElfReader()
     : did_read_(false), did_load_(false), fd_(-1), file_offset_(0), file_size_(0), phdr_num_(0),
       phdr_table_(nullptr), shdr_table_(nullptr), shdr_num_(0), dynamic_(nullptr), strtab_(nullptr),
@@ -526,12 +530,40 @@
   return max_vaddr - min_vaddr;
 }
 
+// Returns the maximum p_align associated with a loadable segment in the ELF
+// 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;
+
+  for (size_t i = 0; i < phdr_count; ++i) {
+    const ElfW(Phdr)* phdr = &phdr_table[i];
+
+    // p_align must be 0, 1, or a positive, integral power of two.
+    if (phdr->p_type != PT_LOAD || ((phdr->p_align & (phdr->p_align - 1)) != 0)) {
+      continue;
+    }
+
+    if (phdr->p_align > maximum_alignment) {
+      maximum_alignment = phdr->p_align;
+    }
+  }
+
+#if defined(__LP64__)
+  return maximum_alignment;
+#else
+  return PAGE_SIZE;
+#endif
+}
+
 // Reserve a virtual address range such that if it's limits were extended to the next 2**align
 // boundary, it would not overlap with any existing mappings.
-static void* ReserveWithAlignmentPadding(size_t size, size_t align, void** out_gap_start,
-                                         size_t* out_gap_size) {
+static void* ReserveWithAlignmentPadding(size_t size, size_t mapping_align, size_t start_align,
+                                         void** out_gap_start, size_t* out_gap_size) {
   int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS;
-  if (align == PAGE_SIZE) {
+  // Reserve enough space to properly align the library's start address.
+  mapping_align = std::max(mapping_align, start_align);
+  if (mapping_align == PAGE_SIZE) {
     void* mmap_ptr = mmap(nullptr, size, PROT_NONE, mmap_flags, -1, 0);
     if (mmap_ptr == MAP_FAILED) {
       return nullptr;
@@ -550,24 +582,24 @@
   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, align) + 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) {
     return nullptr;
   }
   size_t gap_size = 0;
-  size_t first_byte = reinterpret_cast<size_t>(align_up(mmap_ptr, align));
-  size_t last_byte = reinterpret_cast<size_t>(align_down(mmap_ptr + mmap_size, align) - 1);
+  size_t first_byte = reinterpret_cast<size_t>(align_up(mmap_ptr, mapping_align));
+  size_t last_byte = reinterpret_cast<size_t>(align_down(mmap_ptr + mmap_size, mapping_align) - 1);
   if (kGapAlignment && first_byte / kGapAlignment != last_byte / kGapAlignment) {
     // This library crosses a 2MB boundary and will fragment a new huge page.
     // Lets take advantage of that and insert a random number of inaccessible huge pages before that
     // to improve address randomization and make it harder to locate this library code by probing.
     munmap(mmap_ptr, mmap_size);
-    align = std::max(align, kGapAlignment);
+    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, align) + 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;
@@ -582,13 +614,13 @@
     gap_start = gap_end = mmap_ptr + mmap_size;
   }
 
-  uint8_t* first = align_up(mmap_ptr, align);
-  uint8_t* last = align_down(gap_start, align) - size;
+  uint8_t* first = align_up(mmap_ptr, mapping_align);
+  uint8_t* last = align_down(gap_start, mapping_align) - size;
 
   // arc4random* is not available in first stage init because /dev/urandom hasn't yet been
   // created. Don't randomize then.
-  size_t n = is_first_stage_init() ? 0 : arc4random_uniform((last - first) / PAGE_SIZE + 1);
-  uint8_t* start = first + n * PAGE_SIZE;
+  size_t n = is_first_stage_init() ? 0 : arc4random_uniform((last - first) / start_align + 1);
+  uint8_t* start = first + n * start_align;
   // Unmap the extra space around the allocation.
   // Keep it mapped PROT_NONE on 64-bit targets where address space is plentiful to make it harder
   // to defeat ASLR by probing for readable memory mappings.
@@ -622,7 +654,15 @@
              load_size_ - address_space->reserved_size, load_size_, name_.c_str());
       return false;
     }
-    start = ReserveWithAlignmentPadding(load_size_, kLibraryAlignment, &gap_start_, &gap_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 = ReserveWithAlignmentPadding(load_size_, kLibraryAlignment, start_alignment, &gap_start_,
+                                        &gap_size_);
     if (start == nullptr) {
       DL_ERR("couldn't reserve %zd bytes of address space for \"%s\"", load_size_, name_.c_str());
       return false;
@@ -706,6 +746,13 @@
         DL_ERR("couldn't map \"%s\" segment %zd: %s", name_.c_str(), i, strerror(errno));
         return false;
       }
+
+      // Mark segments as huge page eligible if they meet the requirements
+      // (executable and PMD aligned).
+      if ((phdr->p_flags & PF_X) && phdr->p_align == kPmdSize &&
+          get_transparent_hugepages_supported()) {
+        madvise(seg_addr, file_length, MADV_HUGEPAGE);
+      }
     }
 
     // if the segment is writable, and does not end on a page boundary,
diff --git a/linker/linker_phdr.h b/linker/linker_phdr.h
index 548dc51..98bf020 100644
--- a/linker/linker_phdr.h
+++ b/linker/linker_phdr.h
@@ -120,6 +120,8 @@
 size_t phdr_table_get_load_size(const ElfW(Phdr)* phdr_table, size_t phdr_count,
                                 ElfW(Addr)* min_vaddr = nullptr, ElfW(Addr)* max_vaddr = nullptr);
 
+size_t phdr_table_get_maximum_alignment(const ElfW(Phdr)* phdr_table, size_t phdr_count);
+
 int phdr_table_protect_segments(const ElfW(Phdr)* phdr_table, size_t phdr_count,
                                 ElfW(Addr) load_bias, const GnuPropertySection* prop = nullptr);
 
diff --git a/linker/linker_transparent_hugepage_support.cpp b/linker/linker_transparent_hugepage_support.cpp
new file mode 100644
index 0000000..65ba4cd
--- /dev/null
+++ b/linker/linker_transparent_hugepage_support.cpp
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <string>
+
+#include <android-base/file.h>
+
+#include "linker.h"
+
+bool get_transparent_hugepages_supported() {
+  static bool transparent_hugepages_supported = []() {
+    std::string enabled;
+    if (!android::base::ReadFileToString("/sys/kernel/mm/transparent_hugepage/enabled", &enabled)) {
+      return false;
+    }
+    return enabled.find("[never]") == std::string::npos;
+  };
+  return transparent_hugepages_supported;
+}