ra8_infrastructure.c

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#include "ra8_infrastructure.h"
 
#include <stdint.h>
 
#include "ra8_attributes.h"
#include "ra8_err.h"
#include "ra8_log.h"
#include "ra8_pin_validator.h"
 
/* =============================================================================
 * Stack canary sentinel
 * =============================================================================
 */
 
#ifndef RA8_OFF_TARGET
extern uint32_t g_ra8_ls_stack_canary_start[];
extern uint32_t g_ra8_ls_stack_canary_end[];
#endif
 
typedef enum : uint32_t {
  k_ra8_stack_canary_pattern = 0xDEADBEEFUL, 
} ra8_stack_canary_pattern_t;

RA8_INTERNAL static void internal_write_stack_canary(void)
{
#ifndef RA8_OFF_TARGET
  for (uint32_t* w = g_ra8_ls_stack_canary_start; w < g_ra8_ls_stack_canary_end; w++) {
    *w = (uint32_t)k_ra8_stack_canary_pattern;
  }
#endif
}

void ra8_infrastructure_init(void)
{
  /* Logging backend first so the rest of the init flow can emit. */
  ra8_log_init();
 
  /* Clear pin-ownership bookkeeping. */
  ra8_pin_validator_reset();
 
  /* Seed the stack overflow sentinel. */
  internal_write_stack_canary();
 
  ra8_log_info("INFRA", "infrastructure ready");
}

ra8_err_t ra8_stack_canary_check(void)
{
#ifndef RA8_OFF_TARGET
  for (uint32_t* w = g_ra8_ls_stack_canary_start; w < g_ra8_ls_stack_canary_end; w++) {
    if (*w != (uint32_t)k_ra8_stack_canary_pattern) {
      return k_ra8_err_validation_failed;
    }
  }
#endif
  return k_ra8_ok;
}