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Diffstat (limited to 'arch/x86/vdso/vdso32-setup.c')
-rw-r--r--arch/x86/vdso/vdso32-setup.c30
1 files changed, 10 insertions, 20 deletions
diff --git a/arch/x86/vdso/vdso32-setup.c b/arch/x86/vdso/vdso32-setup.c
index cf058fecfce..513f330c583 100644
--- a/arch/x86/vdso/vdso32-setup.c
+++ b/arch/x86/vdso/vdso32-setup.c
@@ -193,30 +193,16 @@ static __init void relocate_vdso(Elf32_Ehdr *ehdr)
}
}
-/*
- * These symbols are defined by vdso32.S to mark the bounds
- * of the ELF DSO images included therein.
- */
-extern const char vdso32_default_start, vdso32_default_end;
-extern const char vdso32_sysenter_start, vdso32_sysenter_end;
static struct page *vdso32_pages[1];
#ifdef CONFIG_X86_64
-static int use_sysenter __read_mostly = -1;
-
-#define vdso32_sysenter() (use_sysenter > 0)
+#define vdso32_sysenter() (boot_cpu_has(X86_FEATURE_SYSENTER32))
+#define vdso32_syscall() (boot_cpu_has(X86_FEATURE_SYSCALL32))
/* May not be __init: called during resume */
void syscall32_cpu_init(void)
{
- if (use_sysenter < 0) {
- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
- use_sysenter = 1;
- if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR)
- use_sysenter = 1;
- }
-
/* Load these always in case some future AMD CPU supports
SYSENTER from compat mode too. */
checking_wrmsrl(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS);
@@ -235,6 +221,7 @@ static inline void map_compat_vdso(int map)
#else /* CONFIG_X86_32 */
#define vdso32_sysenter() (boot_cpu_has(X86_FEATURE_SEP))
+#define vdso32_syscall() (0)
void enable_sep_cpu(void)
{
@@ -305,12 +292,15 @@ int __init sysenter_setup(void)
gate_vma_init();
#endif
- if (!vdso32_sysenter()) {
- vsyscall = &vdso32_default_start;
- vsyscall_len = &vdso32_default_end - &vdso32_default_start;
- } else {
+ if (vdso32_syscall()) {
+ vsyscall = &vdso32_syscall_start;
+ vsyscall_len = &vdso32_syscall_end - &vdso32_syscall_start;
+ } else if (vdso32_sysenter()){
vsyscall = &vdso32_sysenter_start;
vsyscall_len = &vdso32_sysenter_end - &vdso32_sysenter_start;
+ } else {
+ vsyscall = &vdso32_int80_start;
+ vsyscall_len = &vdso32_int80_end - &vdso32_int80_start;
}
memcpy(syscall_page, vsyscall, vsyscall_len);