Vita dynarec example

dynarec.c

#include <psp2/kernel/sysmem.h>

int dynarec_test(void)
{
  int block;
  int ret;
  void *base;
  int (*func)(void);

  // allocate block in VM domain
  block = sceKernelAllocMemBlockForVM("code", 0x100000);
  if (block < 0)
  {
    return block;
  }

  // get base address
  ret = sceKernelGetMemBlockBase(block, &base);
  if (ret < 0)
  {
    return ret;
  }

  // set domain to be writable by user
  ret = sceKernelOpenVMDomain();
  if (ret < 0)
  {
    return ret;
  }

  // write thumb code: MOVS R0, #5, BX LR
  *(uint32_t *)base = 0x47702005;

  // set domain back to read-only
  ret = sceKernelCloseVMDomain();
  if (ret < 0)
  {
    return ret;
  }

  // flush icache
  ret = sceKernelSyncVMDomain(block, base, 0x1000);
  if (ret < 0)
  {
    return ret;
  }

  // call function
  func = (char*)base + 1;
  ret = func(); // should return 5
  
  // release block when we're done
  sceKernelFreeMemBlock(block);
  
  return ret;
}