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arm: armv6-m: Support relocating vector table

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An abnormal crash was encountered in ARMv6-M SoCs that don't have flash
starting at 0.  With Zephyr OS the reason for this crash is that, on
ARMv6-M the system requires an exception vector table at the 0 address.

We implement the relocate_vector_table function to move the vector table
code to address 0 on systems which don't have the start of code already
at 0.

[kumar.gala: reworderd commit message, tweaked how we check if we need
 to copy vector table]

Signed-off-by: Xiaorui Hu <xiaorui.hu@linaro.org>
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit is contained in:
Xiaorui Hu 2017-06-23 11:02:50 +08:00 • committed by Anas Nashif
commit eb48a0a73c
3 changed files with 17 additions and 3 deletions
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3
include/linker/linker-defs.h
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@ -208,6 +208,9 @@ extern char _image_text_end[];
extern char _image_rodata_start[];
extern char _image_rodata_end[];
extern char _vector_start[];
extern char _vector_end[];
/* end address of image, used by newlib for the heap */
extern char _end[];