make minor improvements to linker script

Author: max-niederman

compiler/rustc_target/src/spec/targets/armv7a_vex_v5_linker_script.ld

@@ -11,7 +11,11 @@ MEMORY {
 }
 
 __stack_length = 0x400000;
-__heap_end = __user_ram_end - __stack_length - 64;
+/*
+It's currently unclear why subtracting anything is necessary, but it fixes memory permission errors.
+0x100 is an arbitrary number that works.
+*/
+__heap_end = __user_ram_end - __stack_length - 0x1000;
 
 SECTIONS {
     .code_signature __user_ram_start : {
@@ -25,10 +29,12 @@ SECTIONS {
 
     .rodata : {
         *(.rodata .rodata.*)
+        *(.rodata1 .rodata1.*)
     } > USER_RAM
 
     .data : {
         *(.data .data.*)
+        *(.data1 .data1.*)
     } > USER_RAM
 
     .bss : {

library/std/src/sys/pal/vexos/alloc.rs

@@ -40,7 +40,7 @@ unsafe impl dlmalloc::Allocator for Vexos {
     }
 
     fn free(&self, _ptr: *mut u8, _size: usize) -> bool {
-        return false;
+        false
     }
 
     fn can_release_part(&self, _flags: u32) -> bool {