include/zephyr: Fix linker scripts to define _end after all static RA…

…M data

The Zephyr linker scripts have inconsistent ordering of various chunks of
data which lands in RAM at runtime. This leads to the value of _end not
being consistently defined as the maximum address of static variables used
in the application.

Create a helper linker fragment, zephyr/linker/ram-end.ld, which can be
included after the last possible definition of RAM data, that consistently
sets _image_ram_end, _end and z_mapped_end.

Signed-off-by: Keith Packard <keithp@keithp.com>
(cherry picked from commit 710422e)

boards/x86/qemu_x86/qemu_x86_tiny.ld

@@ -788,14 +788,9 @@ SECTIONS
 	__kernel_ram_end = KERNEL_BASE_ADDR + KERNEL_RAM_SIZE;
 	__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
-	_image_ram_end = .;
 	_image_ram_all = (KERNEL_BASE_ADDR + KERNEL_RAM_SIZE) - _image_ram_start;
 
-	z_mapped_end = .;
 	z_mapped_size = z_mapped_end - z_mapped_start;
-	_end = .; /* end of image */
-
-	GROUP_END(RAMABLE_REGION)
 
 #ifndef LINKER_ZEPHYR_FINAL
 	/* static interrupts */
@@ -823,6 +818,12 @@ SECTIONS
  */
 #include <snippets-sections.ld>
 
+#define LAST_RAM_ALIGN MMU_PAGE_ALIGN
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
 	/DISCARD/ : { *(.note.GNU-stack) }

include/zephyr/arch/arc/v2/linker.ld

@@ -246,8 +246,6 @@ SECTIONS {
 
 	MPU_MIN_SIZE_ALIGN
 	/* Define linker symbols */
-	_image_ram_end = .;
-	_end = .; /* end of image */
 
 	__kernel_ram_end = .;
 	__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
@@ -278,13 +276,15 @@ SECTIONS {
 	} GROUP_DATA_LINK_IN(YCCM, RAMABLE_REGION)
 #endif
 
-	GROUP_END(RAMABLE_REGION)
-
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */
 #include <snippets-sections.ld>
 
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
 	SECTION_PROLOGUE(.ARC.attributes, 0,) {

include/zephyr/arch/arm/aarch32/cortex_a_r/scripts/linker.ld

@@ -332,16 +332,9 @@ SECTIONS
 
     /* Define linker symbols */
 
-    . = ALIGN(_region_min_align);
-    _image_ram_end = .;
-    _end = .; /* end of image */
-    z_mapped_end = .;
-
     __kernel_ram_end = RAM_ADDR + RAM_SIZE;
     __kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
-    GROUP_END(RAMABLE_REGION)
-
 #if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_ocm), okay)
 GROUP_START(OCM)
 
@@ -373,6 +366,12 @@ GROUP_END(OCM)
  */
 #include <snippets-sections.ld>
 
+#define LAST_RAM_ALIGN . = ALIGN(_region_min_align);
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
     SECTION_PROLOGUE(.ARM.attributes, 0,)

include/zephyr/arch/arm/aarch32/cortex_m/scripts/linker.ld

@@ -361,14 +361,9 @@ SECTIONS
 
     /* Define linker symbols */
 
-    _image_ram_end = .;
-    _end = .; /* end of image */
-
     __kernel_ram_end = RAM_ADDR + RAM_SIZE;
     __kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
-    GROUP_END(RAMABLE_REGION)
-
 #if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_itcm), okay)
 GROUP_START(ITCM)
 
@@ -426,6 +421,10 @@ GROUP_END(DTCM)
  */
 #include <snippets-sections.ld>
 
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
     /DISCARD/ : { *(.note.GNU-stack) }

include/zephyr/arch/arm64/scripts/linker.ld

@@ -295,21 +295,21 @@ SECTIONS
 
     /* Define linker symbols */
 
-    MMU_ALIGN;
-    _image_ram_end = .;
-    _end = .; /* end of image */
-    z_mapped_end = .;
-
     __kernel_ram_end = RAM_ADDR + RAM_SIZE;
     __kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
-    GROUP_END(RAMABLE_REGION)
 
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */
 #include <snippets-sections.ld>
 
+#define LAST_RAM_ALIGN MMU_ALIGN;
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
     SECTION_PROLOGUE(.ARM.attributes, 0,)

include/zephyr/arch/mips/linker.ld

@@ -181,14 +181,15 @@ SECTIONS
 
 #include <zephyr/linker/cplusplus-ram.ld>
 
-     _image_ram_end = .;
-     _end = .; /* end of image */
-
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */
 #include <snippets-sections.ld>
 
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
 	.mdebug.abi32 : {

include/zephyr/arch/nios2/linker.ld

@@ -259,17 +259,15 @@ SECTIONS
 
 #include <zephyr/linker/common-noinit.ld>
 
-    /* Define linker symbols */
-    _image_ram_end = .;
-    _end = .; /* end of image */
-
-    GROUP_END(RAMABLE_REGION)
-
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */
 #include <snippets-sections.ld>
 
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
     }

include/zephyr/arch/riscv/common/linker.ld

@@ -305,11 +305,6 @@ SECTIONS
 
     __data_region_end = .;
 
-    MPU_MIN_SIZE_ALIGN
-
-     _image_ram_end = .;
-     _end = .; /* end of image */
-
 	__kernel_ram_end = .;
 	__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
@@ -370,7 +365,11 @@ GROUP_END(DTCM)
  */
 #include <snippets-sections.ld>
 
-     GROUP_END(RAMABLE_REGION)
+#define LAST_RAM_ALIGN MPU_MIN_SIZE_ALIGN
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
 
 #include <zephyr/linker/debug-sections.ld>
 

include/zephyr/arch/sparc/linker.ld

@@ -154,14 +154,15 @@ SECTIONS
 
 #include <zephyr/linker/cplusplus-ram.ld>
 
-     _image_ram_end = .;
-     _end = .; /* end of image */
-
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */
 #include <snippets-sections.ld>
 
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
     /DISCARD/ : { *(.note.GNU-stack) }

include/zephyr/arch/x86/ia32/linker.ld

@@ -503,14 +503,10 @@ SECTIONS
 	__kernel_ram_end = KERNEL_BASE_ADDR + KERNEL_RAM_SIZE;
 	__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
-	_image_ram_end = .;
 	_image_ram_all = (KERNEL_BASE_ADDR + KERNEL_RAM_SIZE) - _image_ram_start;
 
 	z_mapped_end = .;
 	z_mapped_size = z_mapped_end - z_mapped_start;
-	_end = .; /* end of image */
-
-	GROUP_END(RAMABLE_REGION)
 
 #ifndef LINKER_ZEPHYR_FINAL
 	/* static interrupts */
@@ -538,6 +534,10 @@ SECTIONS
  */
 #include <snippets-sections.ld>
 
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #include <zephyr/linker/debug-sections.ld>
 
 	/DISCARD/ : { *(.note.GNU-stack) }

include/zephyr/arch/x86/intel64/linker.ld

@@ -192,10 +192,12 @@ SECTIONS
 
 /* Must be last in RAM */
 #include <zephyr/linker/kobject-data.ld>
-	MMU_PAGE_ALIGN
-	_image_ram_end = .;
-	z_mapped_end = .;
-	_end = .;
+
+#define LAST_RAM_ALIGN MMU_PAGE_ALIGN
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
 
 	/* All unused memory also owned by the kernel for heaps */
 	__kernel_ram_end = KERNEL_BASE_ADDR + KERNEL_RAM_SIZE;

include/zephyr/linker/ram-end.ld

@@ -0,0 +1,14 @@
+/*
+ * Added after the very last allocation that might land in RAM to define the various
+ * end-of-used-memory symbols
+ */
+
+    SECTION_PROLOGUE(.last_ram_section,,)
+    {
+#ifdef LAST_RAM_ALIGN
+	LAST_RAM_ALIGN
+#endif
+	_image_ram_end = .;
+	_end = .; /* end of image */
+	z_mapped_end = .;
+    } GROUP_NOLOAD_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)

soc/arm64/nxp_imx/mimx9/linker.ld

@@ -312,21 +312,20 @@ SECTIONS
 
     /* Define linker symbols */
 
-    MMU_ALIGN;
-    _image_ram_end = .;
-    _end = .; /* end of image */
-    z_mapped_end = .;
-
-    __kernel_ram_end = RAM_ADDR + RAM_SIZE;
-    __kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
-
-    GROUP_END(RAMABLE_REGION)
-
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */
 #include <snippets-sections.ld>
 
+#define LAST_RAM_ALIGN MMU_ALIGN;
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
+    __kernel_ram_end = RAM_ADDR + RAM_SIZE;
+    __kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
+
 #include <zephyr/linker/debug-sections.ld>
 
     SECTION_PROLOGUE(.ARM.attributes, 0,)

soc/riscv/openisa_rv32m1/linker.ld

@@ -233,16 +233,15 @@ SECTIONS
  */
 #include <snippets-ram-sections.ld>
 
-     _image_ram_end = .;
-     _end = .; /* end of image */
-
-     GROUP_END(RAM)
-
 /* Located in generated directory. This file is populated by the
  * zephyr_linker_sources() Cmake function.
  */
 #include <snippets-sections.ld>
 
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
+
 #ifdef CONFIG_GEN_ISR_TABLES
 /* Bogus section, post-processed during the build to initialize interrupts. */
 #include <zephyr/linker/intlist.ld>

soc/riscv/riscv-ite/it8xxx2/linker.ld

@@ -356,11 +356,6 @@ SECTIONS
 
     __data_region_end = .;
 
-    MPU_MIN_SIZE_ALIGN
-
-     _image_ram_end = .;
-     _end = .; /* end of image */
-
 	__kernel_ram_end = .;
 	__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
@@ -369,7 +364,11 @@ SECTIONS
  */
 #include <snippets-sections.ld>
 
-     GROUP_END(RAMABLE_REGION)
+#define LAST_RAM_ALIGN MPU_MIN_SIZE_ALIGN
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
 
 #include <zephyr/linker/debug-sections.ld>
 

soc/riscv/riscv-privileged/andes_v5/ae350/linker.ld

@@ -274,11 +274,6 @@ SECTIONS
 
     __data_region_end = .;
 
-    MPU_MIN_SIZE_ALIGN
-
-     _image_ram_end = .;
-     _end = .; /* end of image */
-
 	__kernel_ram_end = .;
 	__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;
 
@@ -339,7 +334,11 @@ GROUP_END(DTCM)
  */
 #include <snippets-sections.ld>
 
-     GROUP_END(RAMABLE_REGION)
+#define LAST_RAM_ALIGN MPU_MIN_SIZE_ALIGN
+
+#include <zephyr/linker/ram-end.ld>
+
+    GROUP_END(RAMABLE_REGION)
 
 #include <zephyr/linker/debug-sections.ld>
 

soc/xtensa/intel_adsp/ace/ace-link.ld

@@ -403,6 +403,8 @@ SECTIONS {
     _unused_ram_start_marker = .;
     *(.unused_ram_start_marker)
     *(.unused_ram_start_marker.*)
+    _end = .;
+    z_mapped_end = .;
   } >ram
 
   . = L2_SRAM_BASE + L2_SRAM_SIZE;