linker: add a way to add snippets to text section

This adds a way to add to the text section via
zephyr_linker_sources(TEXT_SECTIONS <...>).

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

cmake/modules/extensions.cmake

@@ -1319,6 +1319,7 @@ function(zephyr_linker_sources location)
   set(rom_sections_path  "${snippet_base}/snippets-rom-sections.ld")
   set(ram_sections_path  "${snippet_base}/snippets-ram-sections.ld")
   set(data_sections_path "${snippet_base}/snippets-data-sections.ld")
+  set(text_sections_path "${snippet_base}/snippets-text-sections.ld")
   set(rom_start_path     "${snippet_base}/snippets-rom-start.ld")
   set(noinit_path        "${snippet_base}/snippets-noinit.ld")
   set(rwdata_path        "${snippet_base}/snippets-rwdata.ld")
@@ -1339,6 +1340,7 @@ function(zephyr_linker_sources location)
     file(WRITE ${rom_sections_path} "")
     file(WRITE ${ram_sections_path} "")
     file(WRITE ${data_sections_path} "")
+    file(WRITE ${text_sections_path} "")
     file(WRITE ${rom_start_path} "")
     file(WRITE ${noinit_path} "")
     file(WRITE ${rwdata_path} "")
@@ -1362,6 +1364,8 @@ function(zephyr_linker_sources location)
     set(snippet_path "${ram_sections_path}")
   elseif("${location}" STREQUAL "DATA_SECTIONS")
     set(snippet_path "${data_sections_path}")
+  elseif("${location}" STREQUAL "TEXT_SECTIONS")
+    set(snippet_path "${text_sections_path}")
   elseif("${location}" STREQUAL "ROM_START")
     set(snippet_path "${rom_start_path}")
   elseif("${location}" STREQUAL "NOINIT")