/*
* Set the bit indicating "nosegneg" library variants should be used.
+ * We only need to bother in pure 32-bit mode; compat 32-bit processes
+ * can have un-truncated segments, so wrapping around is allowed.
*/
static void __init fiddle_vdso(void)
{
- extern const char vdso32_default_start;
- u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
+#ifdef CONFIG_X86_32
+ u32 *mask;
+ mask = VDSO32_SYMBOL(&vdso32_int80_start, NOTE_MASK);
*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
+ mask = VDSO32_SYMBOL(&vdso32_sysenter_start, NOTE_MASK);
+ *mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
+#endif
}
static __cpuinit int register_callback(unsigned type, const void *func)
void __cpuinit xen_enable_sysenter(void)
{
- int cpu = smp_processor_id();
extern void xen_sysenter_target(void);
+ int ret;
+ unsigned sysenter_feature;
+
+#ifdef CONFIG_X86_32
+ sysenter_feature = X86_FEATURE_SEP;
+#else
+ sysenter_feature = X86_FEATURE_SYSENTER32;
+#endif
+
+ if (!boot_cpu_has(sysenter_feature))
+ return;
+
+ ret = register_callback(CALLBACKTYPE_sysenter, xen_sysenter_target);
+ if(ret != 0)
+ setup_clear_cpu_cap(sysenter_feature);
+}
+
+void __cpuinit xen_enable_syscall(void)
+{
+#ifdef CONFIG_X86_64
+ int ret;
+ extern void xen_syscall_target(void);
+ extern void xen_syscall32_target(void);
+
+ ret = register_callback(CALLBACKTYPE_syscall, xen_syscall_target);
+ if (ret != 0) {
+ printk(KERN_ERR "Failed to set syscall callback: %d\n", ret);
+ /* Pretty fatal; 64-bit userspace has no other
+ mechanism for syscalls. */
+ }
- if (!boot_cpu_has(X86_FEATURE_SEP) ||
- register_callback(CALLBACKTYPE_sysenter,
- xen_sysenter_target) != 0) {
- clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
- clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
+ if (boot_cpu_has(X86_FEATURE_SYSCALL32)) {
+ ret = register_callback(CALLBACKTYPE_syscall32,
+ xen_syscall32_target);
+ if (ret != 0)
+ setup_clear_cpu_cap(X86_FEATURE_SYSCALL32);
}
+#endif /* CONFIG_X86_64 */
}
void __init xen_arch_setup(void)
BUG();
xen_enable_sysenter();
+ xen_enable_syscall();
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);