test.c

#include <stdint.h>
#include "ipc_rpmsg_linux_resource_table.h"
#include <string.h>

void Reset_Handler  (void) __attribute__ ((naked));
void Default_Handler(void);

void Undef_Handler (void) __attribute__ ((weak, alias("Default_Handler")));
void SVC_Handler   (void) __attribute__ ((weak, alias("Default_Handler")));
void PAbt_Handler  (void) __attribute__ ((weak, alias("Default_Handler")));
void DAbt_Handler  (void) __attribute__ ((weak, alias("Default_Handler")));
void IRQ_Handler   (void) __attribute__ ((weak, alias("Default_Handler")));
void FIQ_Handler   (void) __attribute__ ((weak, alias("Default_Handler")));

__attribute__((naked, section(".isr_vector"))) void vectors() {
  asm volatile(
  "LDR    PC, =Reset_Handler                        \n"
  "LDR    PC, =Undef_Handler                        \n"
  "LDR    PC, =SVC_Handler                          \n"
  "LDR    PC, =PAbt_Handler                         \n"
  "LDR    PC, =DAbt_Handler                         \n"
  "NOP                                              \n"
  "LDR    PC, =IRQ_Handler                          \n"
  "LDR    PC, =FIQ_Handler                          \n"
  );
}

extern void _start();

void Reset_Handler() {
    _start();
}
void Default_Handler() {
    while(1);
}

#define DebugP_MEM_LOG_SIZE 1024
__attribute__((section (".log_shared_mem"))) char gDebugMemLog[DebugP_MEM_LOG_SIZE];

const RPMessage_ResourceTable gRPMessage_linuxResourceTable __attribute__ ((section (".resource_table"), aligned (4096))) =
{
    {
        1U,         /* we're the first version that implements this */
        2U,         /* number of entries, MUST be 2 */
        { 0U, 0U, } /* reserved, must be zero */
    },
    /* offsets to the entries */
    {
        offsetof(RPMessage_ResourceTable, vdev),
        offsetof(RPMessage_ResourceTable, trace),
    },
    /* vdev entry */
    {
        RPMESSAGE_RSC_TYPE_VDEV, RPMESSAGE_RSC_VIRTIO_ID_RPMSG,
        0U, 1U, 0U, 0U, 0U, 2U, { 0U, 0U },
    },
    /* the two vrings */
    { RPMESSAGE_RSC_VRING_ADDR_ANY, 4096U, 256U, 1U, 0U },
    { RPMESSAGE_RSC_VRING_ADDR_ANY, 4096U, 256U, 2U, 0U },
    {
        (RPMESSAGE_RSC_TRACE_INTS_VER0 | RPMESSAGE_RSC_TYPE_TRACE),
        (uint32_t)gDebugMemLog, DebugP_MEM_LOG_SIZE,
        0, "trace:r5fss0_0",
    },
};

const char* msg = "Hello world!\n";

int main() {
    strcpy(gDebugMemLog, msg);
    return 0;
}