/**
* @brief Checks access permissions to a memory area.
*
* @param addr Address to be checked.
* @param size Size of memory area.
* @param mask Access permissions mask.
*
* @returns Non-zero if access is authorized, and zero otherwise.
*/
PUBLIC int chkmem(const void *addr, size_t size, mode_t mask)
{
int ret; /* Return value. */
struct region *reg; /* Working memory region. */
struct pregion *preg; /* Working process region. */
/* Get associated process memory region. */
if ((preg = findreg(curr_proc, ADDR(addr))) == NULL)
return (-1);
lockreg(reg = preg->reg);
/* Not allowed. */
if (!(accessreg(curr_proc, reg) & mask))
{
unlockreg(reg);
return (-1);
}
ret = withinreg(preg, ADDR(addr));
ret &= withinreg(preg, ADDR(addr) + size);
unlockreg(reg);
return (ret);
}
void storereg(context* ctx, assembly* casm, qoperand* q, int reg, int local, int temp)
{
accessreg(ctx, casm, 1, q, reg, local, temp);
}
