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linker: align __data_ram/rom_start/end linker symbol names

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Cleanup and preparation commit for linker script generator.

Zephyr linker scripts provides start and end symbols for each section,
and sometimes even size and LMA start symbols.

Generally, start and end symbols uses the following pattern, as:
Section name:             foo
Section start symbol:     __foo_start
Section end symbol:       __foo_end

However, this pattern is not followed consistently.
To allow for linker script generation and ensure consistent naming of
symbols then the following pattern is introduced consistently to allow
for cleaner linker script generation.
Section name:             foo
Section start symbol:     __foo_start
Section end symbol:       __foo_end
Section size symbol:      __foo_size
Section LMA start symbol: __foo_load_start

This commit aligns the symbols for _data_ram/rom to other symbols and in
such a way they follow consistent pattern which allows for linker script
and scatter file generation.

The symbols are named according to the section name they describe.
Section name is `data`

A new group named data_region is introduced which instead spans all the
input and output sections that was previously covered by
__data_ram_start, __data_ram_end, and __data_rom_start.

The following symbols are aligned in this commit:
-  __data_ram_start  -> __data_region_start
-  __data_ram_end    -> __data_region_end
-  __data_rom_start  -> __data_region_load_start

The following new symbols are introduced so that the data section is
aligned with other sections:
-  __data_end
-  __data_start
       value identical to __data_region_start but describes start of
       the section.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
This commit is contained in:
Torsten Rasmussen 2021-05-21 21:21:52 +02:00 • committed by Anas Nashif
commit 65a2de84a9
12 changed files with 97 additions and 43 deletions
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12
soc/riscv/openisa_rv32m1/linker.ld
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@ -159,11 +159,13 @@ SECTIONS
GROUP_START(RAM)
__data_region_start = .;
SECTION_DATA_PROLOGUE(_DATA_SECTION_NAME,,)
{
. = ALIGN(4);
_image_ram_start = .;
__data_ram_start = .;
__data_start = .;
*(.data)
*(.data.*)
@ -178,7 +180,11 @@ SECTIONS
*/
#include <snippets-rwdata.ld>
__data_end = .;
} GROUP_DATA_LINK_IN(RAMABLE_REGION, ROMABLE_REGION)
__data_size = __data_end - __data_start;
__data_load_start = LOADADDR(_DATA_SECTION_NAME);
#include <linker/common-ram.ld>
#include <linker/cplusplus-ram.ld>
@ -188,8 +194,8 @@ SECTIONS
*/
#include <snippets-data-sections.ld>
__data_ram_end = .;
__data_rom_start = LOADADDR(_DATA_SECTION_NAME);
__data_region_end = .;
__data_region_load_start = LOADADDR(_DATA_SECTION_NAME);
SECTION_DATA_PROLOGUE(_BSS_SECTION_NAME,(NOLOAD),)
{