void
_initialize_arm_linux_nat (void)
{
struct target_ops *t;
os_version = get_linux_version (&os_major, &os_minor, &os_release);
/* Fill in the generic GNU/Linux methods. */
t = linux_target ();
/* Add our register access methods. */
t->to_fetch_registers = arm_linux_fetch_inferior_registers;
t->to_store_registers = arm_linux_store_inferior_registers;
t->to_read_description = arm_linux_read_description;
/* Register the target. */
linux_nat_add_target (t);
/* Initialize the standard target descriptions. */
initialize_tdesc_arm_with_iwmmxt ();
}
static const struct target_desc *
arm_linux_read_description (struct target_ops *ops)
{
CORE_ADDR arm_hwcap = 0;
arm_linux_has_wmmx_registers = 0;
arm_linux_vfp_register_count = 0;
if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1)
{
return NULL;
}
if (arm_hwcap & HWCAP_IWMMXT)
{
arm_linux_has_wmmx_registers = 1;
if (tdesc_arm_with_iwmmxt == NULL)
initialize_tdesc_arm_with_iwmmxt ();
return tdesc_arm_with_iwmmxt;
}
if (arm_hwcap & HWCAP_VFP)
{
int pid;
char *buf;
const struct target_desc * result = NULL;
/* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support
Neon with VFPv3-D32. */
if (arm_hwcap & HWCAP_NEON)
{
arm_linux_vfp_register_count = 32;
if (tdesc_arm_with_neon == NULL)
initialize_tdesc_arm_with_neon ();
result = tdesc_arm_with_neon;
}
else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
{
arm_linux_vfp_register_count = 32;
if (tdesc_arm_with_vfpv3 == NULL)
initialize_tdesc_arm_with_vfpv3 ();
result = tdesc_arm_with_vfpv3;
}
else
{
arm_linux_vfp_register_count = 16;
if (tdesc_arm_with_vfpv2 == NULL)
initialize_tdesc_arm_with_vfpv2 ();
result = tdesc_arm_with_vfpv2;
}
/* Now make sure that the kernel supports reading these
registers. Support was added in 2.6.30. */
pid = GET_LWP (inferior_ptid);
errno = 0;
buf = alloca (VFP_REGS_SIZE);
if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0
&& errno == EIO)
result = NULL;
return result;
}
return NULL;
}
