diff options
Diffstat (limited to 'arch/x86/ia32/syscall32.c')
-rw-r--r-- | arch/x86/ia32/syscall32.c | 90 |
1 files changed, 0 insertions, 90 deletions
diff --git a/arch/x86/ia32/syscall32.c b/arch/x86/ia32/syscall32.c deleted file mode 100644 index 98ff99f5b59a..000000000000 --- a/arch/x86/ia32/syscall32.c +++ /dev/null | |||
@@ -1,90 +0,0 @@ | |||
1 | /* | ||
2 | * Copyright 2002,2003 Andi Kleen, SuSE Labs | ||
3 | * | ||
4 | * vsyscall handling for 32bit processes. Map a stub page into it on | ||
5 | * demand because 32bit cannot reach the kernel's fixmaps | ||
6 | */ | ||
7 | #include <linux/mm.h> | ||
8 | #include <linux/string.h> | ||
9 | #include <linux/kernel.h> | ||
10 | #include <linux/gfp.h> | ||
11 | #include <linux/init.h> | ||
12 | #include <linux/stringify.h> | ||
13 | #include <linux/security.h> | ||
14 | #include <asm/proto.h> | ||
15 | #include <asm/tlbflush.h> | ||
16 | #include <asm/ia32_unistd.h> | ||
17 | #include <asm/vsyscall32.h> | ||
18 | |||
19 | extern unsigned char syscall32_syscall[], syscall32_syscall_end[]; | ||
20 | extern unsigned char syscall32_sysenter[], syscall32_sysenter_end[]; | ||
21 | extern int sysctl_vsyscall32; | ||
22 | |||
23 | static struct page *syscall32_pages[1]; | ||
24 | static int use_sysenter = -1; | ||
25 | |||
26 | struct linux_binprm; | ||
27 | |||
28 | /* Setup a VMA at program startup for the vsyscall page */ | ||
29 | int syscall32_setup_pages(struct linux_binprm *bprm, int exstack) | ||
30 | { | ||
31 | struct mm_struct *mm = current->mm; | ||
32 | int ret; | ||
33 | |||
34 | down_write(&mm->mmap_sem); | ||
35 | /* | ||
36 | * MAYWRITE to allow gdb to COW and set breakpoints | ||
37 | * | ||
38 | * Make sure the vDSO gets into every core dump. | ||
39 | * Dumping its contents makes post-mortem fully interpretable later | ||
40 | * without matching up the same kernel and hardware config to see | ||
41 | * what PC values meant. | ||
42 | */ | ||
43 | /* Could randomize here */ | ||
44 | ret = install_special_mapping(mm, VSYSCALL32_BASE, PAGE_SIZE, | ||
45 | VM_READ|VM_EXEC| | ||
46 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| | ||
47 | VM_ALWAYSDUMP, | ||
48 | syscall32_pages); | ||
49 | if (ret == 0) { | ||
50 | current->mm->context.vdso = (void __user *)VSYSCALL32_BASE; | ||
51 | current_thread_info()->sysenter_return = VSYSCALL32_SYSEXIT; | ||
52 | } | ||
53 | up_write(&mm->mmap_sem); | ||
54 | return ret; | ||
55 | } | ||
56 | |||
57 | static int __init init_syscall32(void) | ||
58 | { | ||
59 | char *syscall32_page = (void *)get_zeroed_page(GFP_KERNEL); | ||
60 | |||
61 | if (!syscall32_page) | ||
62 | panic("Cannot allocate syscall32 page"); | ||
63 | syscall32_pages[0] = virt_to_page(syscall32_page); | ||
64 | if (use_sysenter > 0) { | ||
65 | memcpy(syscall32_page, syscall32_sysenter, | ||
66 | syscall32_sysenter_end - syscall32_sysenter); | ||
67 | } else { | ||
68 | memcpy(syscall32_page, syscall32_syscall, | ||
69 | syscall32_syscall_end - syscall32_syscall); | ||
70 | } | ||
71 | return 0; | ||
72 | } | ||
73 | __initcall(init_syscall32); | ||
74 | |||
75 | /* May not be __init: called during resume */ | ||
76 | void syscall32_cpu_init(void) | ||
77 | { | ||
78 | if (use_sysenter < 0) | ||
79 | use_sysenter = (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL); | ||
80 | |||
81 | /* | ||
82 | * Load these always in case some future AMD CPU supports | ||
83 | * SYSENTER from compat mode too. | ||
84 | */ | ||
85 | checking_wrmsrl(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS); | ||
86 | checking_wrmsrl(MSR_IA32_SYSENTER_ESP, 0ULL); | ||
87 | checking_wrmsrl(MSR_IA32_SYSENTER_EIP, (u64)ia32_sysenter_target); | ||
88 | |||
89 | wrmsrl(MSR_CSTAR, ia32_cstar_target); | ||
90 | } | ||