uVisor: Update K64F and EFM32GG linker scripts

This commit improves consistency between different platforms' linker
scripts. In particular, we use "__UVISOR_SRAM_START" instead of
"__UVISOR_BSS_START" as the uVisor BSS sections might be outside of the
SRAM (for example, when using a tightly-coupled memory).

Author: AlessandroA

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/device/TOOLCHAIN_GCC_ARM/MK64FN1M0xxx12.ld

@@ -93,9 +93,9 @@ SECTIONS
   /* The program code and other data goes into internal flash */
   /* Note: The uVisor expects this section at a fixed location, as specified by
    * the porting process configuration parameter: FLASH_OFFSET. */
-  __UVISOR_TEXT_OFFSET = 0x410;
-  __UVISOR_TEXT_START = ORIGIN(m_interrupts) + __UVISOR_TEXT_OFFSET;
-  .text __UVISOR_TEXT_START :
+  __UVISOR_FLASH_OFFSET = 0x410;
+  __UVISOR_FLASH_START = ORIGIN(m_interrupts) + __UVISOR_FLASH_OFFSET;
+  .text __UVISOR_FLASH_START :
   {
     /* uVisor code and data */
     . = ALIGN(4);
@@ -197,27 +197,26 @@ SECTIONS
     __interrupts_ram_end__ = .; /* Define a global symbol at data end */
   } > m_data
 
-  /* Ensure that the uVisor BSS section is put first after the relocated
-   * interrupt table in SRAM. */
-  /* Note: The uVisor expects this section at a fixed location, as specified by
-   * the porting process configuration parameter: SRAM_OFFSET. */
+  /* uVisor own memory and private box memories
+  /* If uVisor shares the SRAM with the OS/app, ensure that this section is
+   * the first one after the VTOR relocation section. */
+  /* Note: The uVisor expects this section at a fixed location, as specified
+           by the porting process configuration parameter: SRAM_OFFSET. */
   __UVISOR_SRAM_OFFSET = 0x400;
-  __UVISOR_BSS_START = ORIGIN(m_data) + __UVISOR_SRAM_OFFSET;
-  ASSERT(__interrupts_ram_end__ <= __UVISOR_BSS_START,
-         "The ISR relocation region overlaps with the uVisor BSS section.")
-  .uvisor.bss __UVISOR_BSS_START (NOLOAD):
+  __UVISOR_SRAM_START = ORIGIN(m_data) + __UVISOR_SRAM_OFFSET;
+  .uvisor.bss __UVISOR_SRAM_START (NOLOAD):
   {
     . = ALIGN(32);
     __uvisor_bss_start = .;
 
-    /* protected uvisor main bss */
+    /* Protected uVisor own BSS section */
     . = ALIGN(32);
     __uvisor_bss_main_start = .;
     KEEP(*(.keep.uvisor.bss.main))
     . = ALIGN(32);
     __uvisor_bss_main_end = .;
 
-    /* protected uvisor secure boxes bss */
+    /* Protected uVisor boxes' static memories */
     . = ALIGN(32);
     __uvisor_bss_boxes_start = .;
     KEEP(*(.keep.uvisor.bss.boxes))
@@ -228,7 +227,10 @@ SECTIONS
     __uvisor_bss_end = .;
   } > m_data
 
-  /* Heap space for the page allocator */
+  /* Heap space for the page allocator
+  /* If uVisor shares the SRAM with the OS/app, ensure that this section is
+   * the first one after the uVisor BSS section. Otherwise, ensure it is the
+   * first one after the VTOR relocation section. */
   .page_heap (NOLOAD) :
   {
     . = ALIGN(32);
@@ -305,6 +307,7 @@ SECTIONS
   } > m_data_2
 
   USB_RAM_GAP = DEFINED(__usb_ram_size__) ? __usb_ram_size__ : 0x800;
+
   /* Uninitialized data section */
   .bss :
   {
@@ -354,11 +357,13 @@ SECTIONS
 
   .ARM.attributes 0 : { *(.ARM.attributes) }
 
-  ASSERT(__StackLimit >= __HeapLimit, "region m_data_2 overflowed with stack and heap")
+  ASSERT(__StackLimit >= __HeapLimit, "Region m_data_2 overflowed with stack and heap")
 
   /* Provide the physical memory boundaries for uVisor. */
   __uvisor_flash_start = ORIGIN(m_interrupts);
   __uvisor_flash_end = ORIGIN(m_text) + LENGTH(m_text);
   __uvisor_sram_start = ORIGIN(m_data);
   __uvisor_sram_end = ORIGIN(m_data_2) + LENGTH(m_data_2);
+  __uvisor_public_sram_start = __uvisor_sram_start;
+  __uvisor_public_sram_end = __uvisor_sram_end;
 }

targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32GG/device/TARGET_1024K/TOOLCHAIN_GCC_ARM/efm32gg.ld

@@ -56,13 +56,12 @@ __vector_size = 0xDC;
  */
 ENTRY(Reset_Handler)
 
-/* Note: The uVisor expects the text section at a fixed location, as specified
-             by the porting process configuration parameter: FLASH_OFFSET. */
-__UVISOR_TEXT_OFFSET = 0x100;
-__UVISOR_TEXT_START = ORIGIN(FLASH) + __UVISOR_TEXT_OFFSET;
-
 SECTIONS
 {
+  /* Note: The uVisor expects the text section at a fixed location, as specified
+               by the porting process configuration parameter: FLASH_OFFSET. */
+  __UVISOR_FLASH_OFFSET = 0x100;
+  __UVISOR_FLASH_START = ORIGIN(FLASH) + __UVISOR_FLASH_OFFSET;
   .text :
   {
     KEEP(*(.vectors))
@@ -71,7 +70,7 @@ SECTIONS
     __end__ = .;
 
     /* uVisor code and data */
-    . = __UVISOR_TEXT_OFFSET;
+    . = __UVISOR_FLASH_OFFSET;
     . = ALIGN(4);
     __uvisor_main_start = .;
     *(.uvisor.main)
@@ -147,24 +146,26 @@ SECTIONS
   } > FLASH
   */
 
-  /* Ensure that the uVisor BSS section is put first in SRAM. */
+  /* uVisor own memory and private box memories
+  /* If uVisor shares the SRAM with the OS/app, ensure that this section is
+   * the first one after the VTOR relocation section. */
   /* Note: The uVisor expects this section at a fixed location, as specified
            by the porting process configuration parameter: SRAM_OFFSET. */
   __UVISOR_SRAM_OFFSET = 0x0;
-  __UVISOR_BSS_START = ORIGIN(RAM) + __UVISOR_SRAM_OFFSET;
-  .uvisor.bss __UVISOR_BSS_START (NOLOAD):
+  __UVISOR_SRAM_START = ORIGIN(m_data) + __UVISOR_SRAM_OFFSET;
+  .uvisor.bss __UVISOR_SRAM_START (NOLOAD):
   {
     . = ALIGN(32);
     __uvisor_bss_start = .;
 
-    /* uVisor main BSS section */
+    /* Protected uVisor own BSS section */
     . = ALIGN(32);
     __uvisor_bss_main_start = .;
     KEEP(*(.keep.uvisor.bss.main))
     . = ALIGN(32);
     __uvisor_bss_main_end = .;
 
-    /* Secure boxes BSS section */
+    /* Protected uVisor boxes' static memories */
     . = ALIGN(32);
     __uvisor_bss_boxes_start = .;
     KEEP(*(.keep.uvisor.bss.boxes))
@@ -175,15 +176,16 @@ SECTIONS
     __uvisor_bss_end = .;
   } > RAM
 
-  /* Heap space for the page allocator */
+  /* Heap space for the page allocator
+  /* If uVisor shares the SRAM with the OS/app, ensure that this section is
+   * the first one after the uVisor BSS section. Otherwise, ensure it is the
+   * first one after the VTOR relocation section. */
   .page_heap (NOLOAD) :
   {
     . = ALIGN(32);
     __uvisor_page_start = .;
     KEEP(*(.keep.uvisor.page_heap))
-
     . = ALIGN( (1 << LOG2CEIL(LENGTH(RAM))) / 8);
-
     __uvisor_page_end = .;
   } > RAM
 
@@ -284,10 +286,6 @@ SECTIONS
     __bss_end__ = .;
   } > RAM
 
-  __StackTop = ORIGIN(RAM) + LENGTH(RAM);
-  __stack = __StackTop;
-  __StackLimit = __StackTop - STACK_SIZE;
-
   .heap (NOLOAD):
   {
     __uvisor_heap_start = .;
@@ -296,17 +294,21 @@ SECTIONS
     end = __end__;
     _end = __end__;
     . += HEAP_SIZE;
+    __HeapLimit = .;
+    __uvisor_heap_end = .;
   } > RAM
 
-  __HeapLimit = __StackLimit;
-  __uvisor_heap_end = __StackLimit;
+  __StackTop = ORIGIN(RAM) + LENGTH(RAM);
+  __stack = __StackTop;
+  __StackLimit = __StackTop - STACK_SIZE;
+
+  ASSERT(__StackLimit >= __HeapLimit, "Region RAM overflowed with stack and heap")
 
   /* Provide physical memory boundaries for uVisor. */
   __uvisor_flash_start = ORIGIN(FLASH);
   __uvisor_flash_end = ORIGIN(FLASH) + LENGTH(FLASH);
   __uvisor_sram_start = ORIGIN(RAM);
   __uvisor_sram_end = ORIGIN(RAM) + LENGTH(RAM);
-
-  /* Check if FLASH usage exceeds FLASH size. */
-  ASSERT(LENGTH(FLASH) >= __uvisor_secure_end, "FLASH memory overflowed!")
+  __uvisor_public_sram_start = __uvisor_sram_start;
+  __uvisor_public_sram_end = __uvisor_sram_end;
 }