static int
linux_read_ldt(struct lwp *l, const struct linux_sys_modify_ldt_args *uap,
register_t *retval)
{
struct x86_get_ldt_args gl;
int error;
union descriptor *ldt_buf;
size_t sz;
/*
* I've checked the linux code - this function is asymetric with
* linux_write_ldt, and returns raw ldt entries.
* NB, the code I saw zerod the spare parts of the user buffer.
*/
DPRINTF(("linux_read_ldt!"));
sz = 8192 * sizeof(*ldt_buf);
ldt_buf = kmem_zalloc(sz, KM_SLEEP);
gl.start = 0;
gl.desc = NULL;
gl.num = SCARG(uap, bytecount) / sizeof(union descriptor);
error = x86_get_ldt1(l, &gl, ldt_buf);
/* NB gl.num might have changed */
if (error == 0) {
*retval = gl.num * sizeof *ldt;
error = copyout(ldt_buf, SCARG(uap, ptr),
gl.num * sizeof *ldt_buf);
}
kmem_free(ldt_buf, sz);
return error;
}
static int
linux_read_ldt(struct lwp *l, const struct linux_sys_modify_ldt_args *uap,
register_t *retval)
{
struct x86_get_ldt_args gl;
int error;
int num_ldt;
union descriptor *ldt_buf;
/*
* I've checked the linux code - this function is asymetric with
* linux_write_ldt, and returns raw ldt entries.
* NB, the code I saw zerod the spare parts of the user buffer.
*/
DPRINTF(("linux_read_ldt!"));
num_ldt = x86_get_ldt_len(l);
if (num_ldt <= 0)
return EINVAL;
gl.start = 0;
gl.desc = NULL;
gl.num = SCARG(uap, bytecount) / sizeof(union descriptor);
if (gl.num > num_ldt)
gl.num = num_ldt;
ldt_buf = malloc(gl.num * sizeof *ldt, M_TEMP, M_WAITOK);
error = x86_get_ldt1(l, &gl, ldt_buf);
/* NB gl.num might have changed */
if (error == 0) {
*retval = gl.num * sizeof *ldt;
error = copyout(ldt_buf, SCARG(uap, ptr),
gl.num * sizeof *ldt_buf);
}
free(ldt_buf, M_TEMP);
return error;
}