linker_lists: Fix alignment issue

The linker script uses alphabetic sorting to group the different linker
lists together. Each group has its own struct and potentially its own
alignment. But when the linker packs the structs together it cannot ensure
that a linker list starts on the expected alignment boundary.

For example, if the first list has a struct size of 8 and we place 3 of
them in the image, that means that the next struct will start at offset
0x18 from the start of the linker_list section. If the next struct has
a size of 16 then it will start at an 8-byte aligned offset, but not a
16-byte aligned offset.

With sandbox on x86_64, a reference to a linker list item using
ll_entry_get() can force alignment of that particular linker_list item,
if it is in the same file as the linker_list item is declared.

Consider this example, where struct driver is 0x80 bytes:

	ll_entry_declare(struct driver, fred, driver)

...

	void *p = ll_entry_get(struct driver, fred, driver)

If these two lines of code are in the same file, then the entry is forced
to be aligned at the 'struct driver' alignment, which is 16 bytes. If the
second line of code is in a different file, then no action is taken, since
the compiler cannot update the alignment of the linker_list item.

In the first case, an 8-byte 'fill' region is added:

 .u_boot_list_2_driver_2_testbus_drv
                0x0000000000270018       0x80 test/built-in.o
                0x0000000000270018                _u_boot_list_2_driver_2_testbus_drv
 .u_boot_list_2_driver_2_testfdt1_drv
                0x0000000000270098       0x80 test/built-in.o
                0x0000000000270098                _u_boot_list_2_driver_2_testfdt1_drv
 *fill*         0x0000000000270118        0x8
 .u_boot_list_2_driver_2_testfdt_drv
                0x0000000000270120       0x80 test/built-in.o
                0x0000000000270120                _u_boot_list_2_driver_2_testfdt_drv
 .u_boot_list_2_driver_2_testprobe_drv
                0x00000000002701a0       0x80 test/built-in.o
                0x00000000002701a0                _u_boot_list_2_driver_2_testprobe_drv

With this, the linker_list no-longer works since items after testfdt1_drv
are not at the expected address.

Ideally we would have a way to tell gcc not to align structs in this way.
It is not clear how we could do this, and in any case it would require us
to adjust every struct used by the linker_list feature.

One possible fix is to force each separate linker_list to start on the
largest possible boundary that can be required by the compiler. However
that does not seem to work on x86_64, which uses 16-byte alignment in this
case but needs 32-byte alignment.

So add a Kconfig option to handle this. Set the default value to 4 so
as to avoid changing platforms that don't need it.

Update the ll_entry_start() accordingly.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/Kconfig

@@ -7,6 +7,17 @@ config HAVE_ARCH_IOREMAP
 config NEEDS_MANUAL_RELOC
 	bool
 
+config LINKER_LIST_ALIGN
+	int
+	default 32 if SANDBOX
+	default 8 if ARM64 || X86
+	default 4
+	help
+	  Force the each linker list to be aligned to this boundary. This
+	  is required if ll_entry_get() is used, since otherwise the linker
+	  may add padding into the table, thus breaking it.
+	  See linker_lists.rst for full details.
+
 choice
 	prompt "Architecture select"
 	default SANDBOX

doc/api/linker_lists.rst

@@ -96,5 +96,64 @@ defined for the whole list and each sub-list:
   %u_boot_list_2_drivers_2_pci_3
   %u_boot_list_2_drivers_3
 
+Alignment issues
+----------------
+
+The linker script uses alphabetic sorting to group the different linker
+lists together. Each group has its own struct and potentially its own
+alignment. But when the linker packs the structs together it cannot ensure
+that a linker list starts on the expected alignment boundary.
+
+For example, if the first list has a struct size of 8 and we place 3 of
+them in the image, that means that the next struct will start at offset
+0x18 from the start of the linker_list section. If the next struct has
+a size of 16 then it will start at an 8-byte aligned offset, but not a
+16-byte aligned offset.
+
+With sandbox on x86_64, a reference to a linker list item using
+ll_entry_get() can force alignment of that particular linker_list item,
+if it is in the same file as the linker_list item is declared.
+
+Consider this example, where struct driver is 0x80 bytes::
+
+    ll_entry_declare(struct driver, fred, driver)
+
+    ...
+
+    void *p = ll_entry_get(struct driver, fred, driver)
+
+If these two lines of code are in the same file, then the entry is forced
+to be aligned at the 'struct driver' alignment, which is 16 bytes. If the
+second line of code is in a different file, then no action is taken, since
+the compiler cannot update the alignment of the linker_list item.
+
+In the first case, an 8-byte 'fill' region is added::
+
+   .u_boot_list_2_driver_2_testbus_drv
+               0x0000000000270018       0x80 test/built-in.o
+               0x0000000000270018                _u_boot_list_2_driver_2_testbus_drv
+   .u_boot_list_2_driver_2_testfdt1_drv
+               0x0000000000270098       0x80 test/built-in.o
+               0x0000000000270098                _u_boot_list_2_driver_2_testfdt1_drv
+   *fill*         0x0000000000270118        0x8
+   .u_boot_list_2_driver_2_testfdt_drv
+               0x0000000000270120       0x80 test/built-in.o
+               0x0000000000270120                _u_boot_list_2_driver_2_testfdt_drv
+   .u_boot_list_2_driver_2_testprobe_drv
+               0x00000000002701a0       0x80 test/built-in.o
+               0x00000000002701a0                _u_boot_list_2_driver_2_testprobe_drv
+
+With this, the linker_list no-longer works since items after testfdt1_drv
+are not at the expected address.
+
+Ideally we would have a way to tell gcc not to align structs in this way.
+It is not clear how we could do this, and in any case it would require us
+to adjust every struct used by the linker_list feature.
+
+The simplest fix seems to be to force each separate linker_list to start
+on the largest possible boundary that can be required by the compiler. This
+is the purpose of CONFIG_LINKER_LIST_ALIGN
+
+
 .. kernel-doc:: include/linker_lists.h
    :internal:

include/linker_lists.h

@@ -124,7 +124,8 @@
  */
 #define ll_entry_start(_type, _list)					\
 ({									\
-	static char start[0] __aligned(4) __attribute__((unused,	\
+	static char start[0] __aligned(CONFIG_LINKER_LIST_ALIGN)	\
+		__attribute__((unused,					\
 		section(".u_boot_list_2_"#_list"_1")));			\
 	(_type *)&start;						\
 })