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ARC: MWDT: Force cleanup .device_states section

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This PR fixes https://github.com/zephyrproject-rtos/zephyr/issues/64268

MWDT supposes .device_states section as BSS because .device_states
variables defined as uninitialized. This causes the section marked
as NOLOAD section and OpenOCD does not take it in account while
flashing it into board memory.
Finally .device_states variables becomes initialized with garbage
from RAM.

In this PR it's suggested to clean .device_states in early init stage.

Signed-off-by: Nikolay Agishev <agishev@synopsys.com>
This commit is contained in:
Nikolay Agishev 2023-11-17 13:27:46 +03:00 • committed by Anas Nashif
commit 4cb194f3e8
1 changed files with 18 additions and 1 deletions
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19
arch/arc/core/prep_c.c
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@ -23,7 +23,6 @@
#include <zephyr/kernel_structs.h>
#include <kernel_internal.h>
/* XXX - keep for future use in full-featured cache APIs */
#if 0
/**
@ -67,6 +66,21 @@ static void invalidate_dcache(void)
}
#endif
#ifdef __CCAC__
extern char __device_states_start[];
extern char __device_states_end[];
/**
* @brief Clear device_states section
*
* This routine clears the device_states section,
* as MW compiler marks the section with NOLOAD flag.
*/
static void dev_state_zero(void)
{
z_early_memset(__device_states_start, 0, __device_states_end - __device_states_start);
}
#endif
extern FUNC_NORETURN void z_cstart(void);
/**
* @brief Prepare to and run C code
@ -77,6 +91,9 @@ extern FUNC_NORETURN void z_cstart(void);
void _PrepC(void)
{
z_bss_zero();
#ifdef __CCAC__
dev_state_zero();
#endif
z_data_copy();
z_cstart();
CODE_UNREACHABLE;