gn: build arm sel_ldr and nacl_helper_bootstrap with 16K page size

Author: illwieckz

src/trusted/service_runtime/linux/BUILD.gn

@@ -25,18 +25,22 @@ if (current_toolchain == bootstrap_toolchain) {
   linker_script_path = rebase_path("nacl_bootstrap.x")
 
   if (current_cpu == "x64") {
+    max_page_size = "0x1000"
     nacl_reserve_top = "0x0"
     linker_emulation = "elf_x86_64"
   }
   if (current_cpu == "x86") {
+    max_page_size = "0x1000"
     nacl_reserve_top = "0x40000000"
     linker_emulation = "elf_i386"
   }
   if (current_cpu == "arm") {
+    max_page_size = "0x10000"
     nacl_reserve_top = "0x40002000"
     linker_emulation = "armelf_linux_eabi"
   }
   if (current_cpu == "mipsel") {
+    max_page_size = "0x1000"
     nacl_reserve_top = "0x40008000"
     linker_emulation = "elf32ltsmip"
   }
@@ -72,6 +76,7 @@ if (current_toolchain == bootstrap_toolchain) {
       "-fno-PIE",
       # Automatic initialization generates memset calls
       "-ftrivial-auto-var-init=uninitialized",
+      "-Wl,-z,max-page-size=" + max_page_size,
     ]
 
     sources = [
@@ -117,7 +122,7 @@ if (current_toolchain == bootstrap_toolchain) {
       # incompatible with our custom linker script's special layout.
       # NOTE: It's important that this option come before --script!
       "-z",
-      "max-page-size=0x1000",
+      "max-page-size=" + max_page_size,
 
       # Link with custom linker script for special
       # layout.  The script uses the symbol RESERVE_TOP.