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arm: cortex-m: Implement CONFIG_TEXT_SECTION_OFFSET

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On other targets, CONFIG_TEXT_SECTION_OFFSET allows the entire image to
be moved in memory to allow space for some type of header.  The Mynewt
project bootloader prepends a small header, and this config needs to be
supported for this to work.

The specific alignment requirements of the vector table are chip
specific, and generally will be a power of two larger than the size of
the vector table.

Change-Id: I631a42ff64fb8ab86bd177659f2eac5208527653
Signed-off-by: David Brown <david.brown@linaro.org>
This commit is contained in:
David Brown 2016-12-12 11:44:50 -07:00 • committed by Kumar Gala
commit dee8ef6f4f
2 changed files with 3 additions and 1 deletions
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3
arch/arm/core/cortex_m/prep_c.c
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@ -29,7 +29,8 @@ static inline void relocate_vector_table(void) { /* do nothing */ }
static inline void relocate_vector_table(void)
{
/* vector table is located at the the beginning of the flash */
_scs_relocate_vector_table((void *)CONFIG_FLASH_BASE_ADDRESS);
_scs_relocate_vector_table((void *)(CONFIG_FLASH_BASE_ADDRESS +
CONFIG_TEXT_SECTION_OFFSET));
}
#else
static inline void relocate_vector_table(void)

1
include/arch/arm/cortex_m/scripts/linker.ld
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@ -72,6 +72,7 @@ SECTIONS
SECTION_PROLOGUE(_TEXT_SECTION_NAME,,)
{
. = CONFIG_TEXT_SECTION_OFFSET;
KEEP(*(.exc_vector_table))
KEEP(*(".exc_vector_table.*"))