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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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13
arch/arm/core/cortex_m/prep_c.c
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@ -22,9 +22,20 @@
#include <linker/linker-defs.h>
#include <nano_internal.h>
#include <arch/arm/cortex_m/cmsis.h>
#include <string.h>
#ifdef CONFIG_ARMV6_M
static inline void relocate_vector_table(void) { /* do nothing */ }
#define VECTOR_ADDRESS 0
static inline void relocate_vector_table(void)
{
#if defined(CONFIG_XIP) && (CONFIG_FLASH_BASE_ADDRESS != 0) || \
!defined(CONFIG_XIP) && (CONFIG_SRAM_BASE_ADDRESS != 0)
size_t vector_size = (size_t)_vector_end - (size_t)_vector_start;
memcpy(VECTOR_ADDRESS, _vector_start, vector_size);
#endif
}
#elif defined(CONFIG_ARMV7_M)
#ifdef CONFIG_XIP
#define VECTOR_ADDRESS ((uintptr_t)&_image_rom_start + \