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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/vdso/vdso32/int80.S
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/*

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 * Code for the vDSO.  This version uses the old int $0x80 method.

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 *

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 * First get the common code for the sigreturn entry points.

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 * This must come first.

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 */

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#include "sigreturn.S"

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	.text

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	.globl __kernel_vsyscall

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	.type __kernel_vsyscall,@function

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	ALIGN

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__kernel_vsyscall:

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.LSTART_vsyscall:

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	int $0x80

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	ret

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.LEND_vsyscall:

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	.size __kernel_vsyscall,.-.LSTART_vsyscall

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	.previous

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	.section .eh_frame,"a",@progbits

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.LSTARTFRAMEDLSI:

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	.long .LENDCIEDLSI-.LSTARTCIEDLSI

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.LSTARTCIEDLSI:

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	.long 0			/* CIE ID */

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	.byte 1			/* Version number */

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	.string "zR"		/* NUL-terminated augmentation string */

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	.uleb128 1		/* Code alignment factor */

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	.sleb128 -4		/* Data alignment factor */

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	.byte 8			/* Return address register column */

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	.uleb128 1		/* Augmentation value length */

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	.byte 0x1b		/* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */

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	.byte 0x0c		/* DW_CFA_def_cfa */

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	.uleb128 4

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	.uleb128 4

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	.byte 0x88		/* DW_CFA_offset, column 0x8 */

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	.uleb128 1

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	.align 4

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.LENDCIEDLSI:

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	.long .LENDFDEDLSI-.LSTARTFDEDLSI /* Length FDE */

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.LSTARTFDEDLSI:

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	.long .LSTARTFDEDLSI-.LSTARTFRAMEDLSI /* CIE pointer */

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	.long .LSTART_vsyscall-.	/* PC-relative start address */

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	.long .LEND_vsyscall-.LSTART_vsyscall

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	.uleb128 0

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	.align 4

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.LENDFDEDLSI:

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	.previous

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	/*

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	 * Pad out the segment to match the size of the sysenter.S version.

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	 */

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VDSO32_vsyscall_eh_frame_size = 0x40

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	.section .data,"aw",@progbits

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	.space VDSO32_vsyscall_eh_frame_size-(.LENDFDEDLSI-.LSTARTFRAMEDLSI), 0

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	.previous

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