When building for MSP430FR6043 with "-mcode-region=none" we can use start/end markers surrounding each section in the linker script to calculate per-sections' CRCs in a post-build step.
Example from msp430fr6043.ld:
.lower.text :
{
. = ALIGN(2);
__CRC_ADDR_FRAM_LOWER_TEXT_START = .; /* FRAM address for CRC-16 post-build calc and check */
*(.lower.text.* .lower.text)
__CRC_ADDR_FRAM_LOWER_TEXT_END = .; /* FRAM address for CRC-16 post-build calc and check */
} > FRAM=0xff
.upper.text :
{
. = ALIGN(2);
__CRC_ADDR_FRAM_UPPER_TEXT_START = .; /* FRAM address for CRC-16 post-build calc and check */
*(.upper.text.* .upper.text)
__CRC_ADDR_FRAM_UPPER_TEXT_END = .; /* FRAM address for CRC-16 post-build calc and check */
} > HIFRAM=0xff
.text :
{
PROVIDE (_start = .);
__CRC_ADDR_FRAM_TEXT_START = .; /* FRAM address for CRC-16 post-build calc and check */
. = ALIGN(2);
KEEP (*(SORT(.crt_*)))
. = ALIGN(2);
KEEP (*(.lowtext))
. = ALIGN(2);
*(.text .stub .text.* .gnu.linkonce.t.* .text:*)
KEEP (*(.text.*personality*))
/* .gnu.warning sections are handled specially by elf32.em. */
*(.gnu.warning)
*(.interp .hash .dynsym .dynstr .gnu.version*)
PROVIDE (__etext = .);
PROVIDE (_etext = .);
PROVIDE (etext = .);
. = ALIGN(2);
KEEP (*(.init))
KEEP (*(.fini))
KEEP (*(.tm_clone_table))
__CRC_ADDR_FRAM_TEXT_END = .; /* FRAM address for CRC-16 post-build calc and check */
} > FRAM=0xff
Then make can invoke msp430-elf-objdump to figure out those markers and use srec_cat to calculate CRCs and inject them into the final binary (in a dedicated memory header) and this works as expected.
However when building with "-mcode-region=either" the result contains .either.text sections which are placed by the linker in either low or high FRAM:
Unfortunately all these .either.text sections are placed outside of the specified linker script markers. Example of a resulted map file:
.lower.text 0x000000000000fe16 0x18
0x000000000000fe16 . = ALIGN (0x2)
0x000000000000fe16 __CRC_ADDR_FRAM_LOWER_TEXT_START = .
*(.lower.text.* .lower.text)
0x000000000000fe16 __CRC_ADDR_FRAM_LOWER_TEXT_END = .
.either.text.some_function_1
0x000000000000fe16 0x10 out.nNvRL3.ltrans0.ltrans.o
.either.text.__udivhi3
0x000000000000fe26 0x8 gcc/msp430-elf/9.3.1/large\libgcc.a(lib2divHI.o)
0x000000000000fe26 __mspabi_divu
.upper.text 0x000000000001443c 0x1b70
0x000000000001443c . = ALIGN (0x2)
0x000000000001443c __CRC_ADDR_FRAM_UPPER_TEXT_START = .
*(.upper.text.* .upper.text)
0x000000000001443c __CRC_ADDR_FRAM_UPPER_TEXT_END = .
*()
.either.text.some_function_2.constprop.0
0x000000000001443c 0x3a out.nNvRL3.ltrans0.ltrans.o
*()
.either.text.some_function_3.constprop.0
0x0000000000014476 0x5e out.nNvRL3.ltrans0.ltrans.o
*()
.either.text.some_function_4.constprop.0
0x00000000000144d4 0x10c out.nNvRL3.ltrans0.ltrans.o
*()
.either.text.some_function_5
0x00000000000145e0 0x10 out.nNvRL3.ltrans0.ltrans.o
*()
.either.text.some_function_6
0x00000000000145f0 0x44 out.nNvRL3.ltrans0.ltrans.o
*()
.either.text. ... etc
*()
.either.text.__mspabi_srll
0x0000000000015f10 0xe gcc/msp430-elf/9.3.1/large\libgcc.a(srli.o)
0x0000000000015f18 __mspabi_srll
*()
.either.text.memcpy
0x0000000000015f1e 0x20 msp430-elf/lib/large\libc.a(lib_a-memcpy.o)
0x0000000000015f1e memcpy
*()
.either.text.memmove
0x0000000000015f3e 0x54 msp430-elf/lib/large\libc.a(lib_a-memmove.o)
0x0000000000015f3e memmove
*()
.either.text.memset
0x0000000000015f92 0x1a msp430-elf/lib/large\libc.a(lib_a-memset.o)
0x0000000000015f92 memset
.text 0x000000000000fe2e 0x14c
0x000000000000fe2e PROVIDE (_start = .)
0x000000000000fe2e __CRC_ADDR_FRAM_TEXT_START = .
0x000000000000fe2e . = ALIGN (0x2)
*(SORT_BY_NAME(.crt_*))
.crt_0000start
0x000000000000fe2e 0x4 msp430-elf/lib/large/crt0.o
0x000000000000fe2e __crt0_start
.crt_0100init_bss
0x000000000000fe32 0x10 msp430-elf/lib/large\libcrt.a(crt_bss.o)
0x000000000000fe32 __crt0_init_bss
.crt_0300movedata
0x000000000000fe42 0x14 msp430-elf/lib/large\libcrt.a(crt_movedata.o)
0x000000000000fe42 __crt0_movedata
.crt_0800call_main
0x000000000000fe56 0x6 msp430-elf/lib/large\libcrt.a(crt_main.o)
0x000000000000fe56 __crt0_call_main
0x000000000000fe5c . = ALIGN (0x2)
*(.lowtext)
.lowtext 0x000000000000fe5c 0x11e out.nNvRL3.ltrans0.ltrans.o
0x000000000000fe5c IRQ_comm
0x000000000000ff42 IRQ_timer
0x000000000000ff60 IRQ_UNMI
0x000000000000ff7a . = ALIGN (0x2)
*(.text .stub .text.* .gnu.linkonce.t.* .text:*)
*(.text.*personality*)
*(.gnu.warning)
*(.interp .hash .dynsym .dynstr .gnu.version*)
[!provide] PROVIDE (__etext = .)
[!provide] PROVIDE (_etext = .)
[!provide] PROVIDE (etext = .)
0x000000000000ff7a . = ALIGN (0x2)
*(.init)
*(.fini)
*(.tm_clone_table)
0x000000000000ff7a __CRC_ADDR_FRAM_TEXT_END = .
As can be seen above, all the .either.text are placed outside any start/end pairing markers.
Is there a way to figure out the start and end of these .either.text sections so that a CRC can be calculated on them too?
Thank you!
