| 1 | /* |
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| 2 | * Code for the vsyscall page. This version uses the old int $0x80 method. |
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| 3 | * |
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| 4 | * NOTE: |
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| 5 | * 1) __kernel_vsyscall _must_ be first in this page. |
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| 6 | * 2) there are alignment constraints on this stub, see vsyscall-sigreturn.S |
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| 7 | * for details. |
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| 8 | */ |
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| 9 | #include <asm/ia32_unistd.h> |
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| 10 | #include <asm/asm-offsets.h> |
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| 11 | |
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| 12 | .code32 |
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| 13 | .text |
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| 14 | .section .text.vsyscall,"ax" |
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| 15 | .globl __kernel_vsyscall |
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| 16 | .type __kernel_vsyscall,@function |
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| 17 | __kernel_vsyscall: |
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| 18 | .LSTART_vsyscall: |
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| 19 | int $0x80 |
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| 20 | ret |
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| 21 | .LEND_vsyscall: |
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| 22 | .size __kernel_vsyscall,.-.LSTART_vsyscall |
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| 23 | .previous |
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| 24 | |
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| 25 | .section .eh_frame,"a",@progbits |
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| 26 | .LSTARTFRAME: |
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| 27 | .long .LENDCIE-.LSTARTCIE |
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| 28 | .LSTARTCIE: |
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| 29 | .long 0 /* CIE ID */ |
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| 30 | .byte 1 /* Version number */ |
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| 31 | .string "zR" /* NUL-terminated augmentation string */ |
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| 32 | .uleb128 1 /* Code alignment factor */ |
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| 33 | .sleb128 -4 /* Data alignment factor */ |
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| 34 | .byte 8 /* Return address register column */ |
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| 35 | .uleb128 1 /* Augmentation value length */ |
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| 36 | .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */ |
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| 37 | .byte 0x0c /* DW_CFA_def_cfa */ |
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| 38 | .uleb128 4 |
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| 39 | .uleb128 4 |
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| 40 | .byte 0x88 /* DW_CFA_offset, column 0x8 */ |
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| 41 | .uleb128 1 |
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| 42 | .align 4 |
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| 43 | .LENDCIE: |
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| 44 | |
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| 45 | .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */ |
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| 46 | .LSTARTFDE1: |
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| 47 | .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */ |
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| 48 | .long .LSTART_vsyscall-. /* PC-relative start address */ |
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| 49 | .long .LEND_vsyscall-.LSTART_vsyscall |
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| 50 | .uleb128 0 /* Augmentation length */ |
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| 51 | .align 4 |
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| 52 | .LENDFDE1: |
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| 53 | |
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| 54 | /* |
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| 55 | * Get the common code for the sigreturn entry points. |
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| 56 | */ |
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| 57 | #define SYSCALL_ENTER_KERNEL int $0x80 |
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| 58 | #include "vsyscall-sigreturn.S" |
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