u-boot/arch
Simon Glass 0b2fa98aa5 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>
2020-12-18 20:32:21 -07:00
..
arc board_f: Factor out bdinfo bi_mem{start, size} to setup_bdinfo 2020-08-06 14:26:35 -04:00
arm dm: treewide: Rename ..._platdata variables to just ..._plat 2020-12-13 16:51:09 -07:00
m68k arch: Move NEEDS_MANUAL_RELOC symbol to Kconfig 2020-11-04 10:13:44 -05:00
microblaze microblaze: Enable GCC garbage collector for full U-Boot 2020-11-20 10:42:53 +01:00
mips mips: octeon: Add bootoctlinux command 2020-10-07 20:25:58 +02:00
nds32 treewide: convert bd_t to struct bd_info by coccinelle 2020-07-17 09:30:13 -04:00
nios2 cpu: Convert the methods to use a const udevice * 2020-07-25 14:46:57 -06:00
powerpc board: Rename uclass to sysinfo 2020-11-06 10:18:20 +08:00
riscv dm: treewide: Rename ..._platdata variables to just ..._plat 2020-12-13 16:51:09 -07:00
sandbox sandbox: add handler for exceptions 2020-12-13 07:58:17 -07:00
sh sh: r2dplus: Add SCIF1 to the basic DT 2020-08-02 19:58:27 +02:00
x86 dm: treewide: Rename ..._platdata variables to just ..._plat 2020-12-13 16:51:09 -07:00
xtensa xtensa: Remove arch_setup_bdinfo() 2020-08-26 09:19:40 +02:00
.gitignore
Kconfig linker_lists: Fix alignment issue 2020-12-18 20:32:21 -07:00
u-boot-elf.lds arch: Add explicit linker script for u-boot-elf 2020-04-03 11:52:55 -04:00