diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/x86_64/ia32/vsyscall-syscall.S |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/x86_64/ia32/vsyscall-syscall.S')
-rw-r--r-- | arch/x86_64/ia32/vsyscall-syscall.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/arch/x86_64/ia32/vsyscall-syscall.S b/arch/x86_64/ia32/vsyscall-syscall.S new file mode 100644 index 000000000000..e2aaf3de8a42 --- /dev/null +++ b/arch/x86_64/ia32/vsyscall-syscall.S | |||
@@ -0,0 +1,68 @@ | |||
1 | /* | ||
2 | * Code for the vsyscall page. This version uses the syscall instruction. | ||
3 | */ | ||
4 | |||
5 | #include <asm/ia32_unistd.h> | ||
6 | #include <asm/offset.h> | ||
7 | #include <asm/segment.h> | ||
8 | |||
9 | .text | ||
10 | .section .text.vsyscall,"ax" | ||
11 | .globl __kernel_vsyscall | ||
12 | .type __kernel_vsyscall,@function | ||
13 | __kernel_vsyscall: | ||
14 | .LSTART_vsyscall: | ||
15 | push %ebp | ||
16 | .Lpush_ebp: | ||
17 | movl %ecx, %ebp | ||
18 | syscall | ||
19 | movl $__USER32_DS, %ecx | ||
20 | movl %ecx, %ss | ||
21 | movl %ebp, %ecx | ||
22 | popl %ebp | ||
23 | .Lpop_ebp: | ||
24 | ret | ||
25 | .LEND_vsyscall: | ||
26 | .size __kernel_vsyscall,.-.LSTART_vsyscall | ||
27 | |||
28 | .section .eh_frame,"a",@progbits | ||
29 | .LSTARTFRAME: | ||
30 | .long .LENDCIE-.LSTARTCIE | ||
31 | .LSTARTCIE: | ||
32 | .long 0 /* CIE ID */ | ||
33 | .byte 1 /* Version number */ | ||
34 | .string "zR" /* NUL-terminated augmentation string */ | ||
35 | .uleb128 1 /* Code alignment factor */ | ||
36 | .sleb128 -4 /* Data alignment factor */ | ||
37 | .byte 8 /* Return address register column */ | ||
38 | .uleb128 1 /* Augmentation value length */ | ||
39 | .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ | ||
40 | .byte 0x0c /* DW_CFA_def_cfa */ | ||
41 | .uleb128 4 | ||
42 | .uleb128 4 | ||
43 | .byte 0x88 /* DW_CFA_offset, column 0x8 */ | ||
44 | .uleb128 1 | ||
45 | .align 4 | ||
46 | .LENDCIE: | ||
47 | |||
48 | .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */ | ||
49 | .LSTARTFDE1: | ||
50 | .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */ | ||
51 | .long .LSTART_vsyscall-. /* PC-relative start address */ | ||
52 | .long .LEND_vsyscall-.LSTART_vsyscall | ||
53 | .uleb128 0 /* Augmentation length */ | ||
54 | /* What follows are the instructions for the table generation. | ||
55 | We have to record all changes of the stack pointer. */ | ||
56 | .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */ | ||
57 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | ||
58 | .uleb128 8 | ||
59 | .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */ | ||
60 | .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */ | ||
61 | .byte 0xc5 /* DW_CFA_restore %ebp */ | ||
62 | .byte 0x0e /* DW_CFA_def_cfa_offset */ | ||
63 | .uleb128 4 | ||
64 | .align 4 | ||
65 | .LENDFDE1: | ||
66 | |||
67 | #define SYSCALL_ENTER_KERNEL syscall | ||
68 | #include "vsyscall-sigreturn.S" | ||