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authorLinus Torvalds <torvalds@linux-foundation.org>2008-01-31 00:40:09 +1100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-01-31 00:40:09 +1100
commitdd430ca20c40ecccd6954a7efd13d4398f507728 (patch)
treeb65089436d17b2bcc6054ede2e335a821b50007f /arch/x86/vdso/vdso32/syscall.S
parent60e233172eabdd1f831bd48631b9626ce2279d9b (diff)
parentafadcd788f37bfa62d92662e54a720c26c91becf (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86
* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86: (890 commits) x86: fix nodemap_size according to nodeid bits x86: fix overlap between pagetable with bss section x86: add PCI IDs to k8topology_64.c x86: fix early_ioremap pagetable ops x86: use the same pgd_list for PAE and 64-bit x86: defer cr3 reload when doing pud_clear() x86: early boot debugging via FireWire (ohci1394_dma=early) x86: don't special-case pmd allocations as much x86: shrink some ifdefs in fault.c x86: ignore spurious faults x86: remove nx_enabled from fault.c x86: unify fault_32|64.c x86: unify fault_32|64.c with ifdefs x86: unify fault_32|64.c by ifdef'd function bodies x86: arch/x86/mm/init_32.c printk fixes x86: arch/x86/mm/init_32.c cleanup x86: arch/x86/mm/init_64.c printk fixes x86: unify ioremap x86: fixes some bugs about EFI memory map handling x86: use reboot_type on EFI 32 ...
Diffstat (limited to 'arch/x86/vdso/vdso32/syscall.S')
-rw-r--r--arch/x86/vdso/vdso32/syscall.S77
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/x86/vdso/vdso32/syscall.S b/arch/x86/vdso/vdso32/syscall.S
new file mode 100644
index 00000000000..5415b5613d5
--- /dev/null
+++ b/arch/x86/vdso/vdso32/syscall.S
@@ -0,0 +1,77 @@
+/*
+ * Code for the vDSO. This version uses the syscall instruction.
+ *
+ * First get the common code for the sigreturn entry points.
+ * This must come first.
+ */
+#define SYSCALL_ENTER_KERNEL syscall
+#include "sigreturn.S"
+
+#include <asm/segment.h>
+
+ .text
+ .globl __kernel_vsyscall
+ .type __kernel_vsyscall,@function
+ ALIGN
+__kernel_vsyscall:
+.LSTART_vsyscall:
+ push %ebp
+.Lpush_ebp:
+ movl %ecx, %ebp
+ syscall
+ movl $__USER32_DS, %ecx
+ movl %ecx, %ss
+ movl %ebp, %ecx
+ popl %ebp
+.Lpop_ebp:
+ ret
+.LEND_vsyscall:
+ .size __kernel_vsyscall,.-.LSTART_vsyscall
+
+ .section .eh_frame,"a",@progbits
+.LSTARTFRAME:
+ .long .LENDCIE-.LSTARTCIE
+.LSTARTCIE:
+ .long 0 /* CIE ID */
+ .byte 1 /* Version number */
+ .string "zR" /* NUL-terminated augmentation string */
+ .uleb128 1 /* Code alignment factor */
+ .sleb128 -4 /* Data alignment factor */
+ .byte 8 /* Return address register column */
+ .uleb128 1 /* Augmentation value length */
+ .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
+ .byte 0x0c /* DW_CFA_def_cfa */
+ .uleb128 4
+ .uleb128 4
+ .byte 0x88 /* DW_CFA_offset, column 0x8 */
+ .uleb128 1
+ .align 4
+.LENDCIE:
+
+ .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */
+.LSTARTFDE1:
+ .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */
+ .long .LSTART_vsyscall-. /* PC-relative start address */
+ .long .LEND_vsyscall-.LSTART_vsyscall
+ .uleb128 0 /* Augmentation length */
+ /* What follows are the instructions for the table generation.
+ We have to record all changes of the stack pointer. */
+ .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */
+ .byte 0x0e /* DW_CFA_def_cfa_offset */
+ .uleb128 8
+ .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */
+ .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */
+ .byte 0xc5 /* DW_CFA_restore %ebp */
+ .byte 0x0e /* DW_CFA_def_cfa_offset */
+ .uleb128 4
+ .align 4
+.LENDFDE1:
+ .previous
+
+ /*
+ * Pad out the segment to match the size of the sysenter.S version.
+ */
+VDSO32_vsyscall_eh_frame_size = 0x40
+ .section .data,"aw",@progbits
+ .space VDSO32_vsyscall_eh_frame_size-(.LENDFDE1-.LSTARTFRAME), 0
+ .previous