[mirror_ubuntu-zesty-kernel.git] / arch / um / sys-x86_64 / stub.S

#include "uml-config.h"

	.globl syscall_stub
.section .__syscall_stub, "x"
syscall_stub:
	syscall
	/* We don't have 64-bit constants, so this constructs the address
	 * we need.
	 */
	movq	$(UML_CONFIG_STUB_DATA >> 32), %rbx
	salq	$32, %rbx
	movq	$(UML_CONFIG_STUB_DATA & 0xffffffff), %rcx
	or	%rcx, %rbx
	movq	%rax, (%rbx)
	int3

	.globl batch_syscall_stub
batch_syscall_stub:
	mov	$(UML_CONFIG_STUB_DATA >> 32), %rbx
	sal	$32, %rbx
	mov	$(UML_CONFIG_STUB_DATA & 0xffffffff), %rax
	or	%rax, %rbx
	/* load pointer to first operation */
	mov	%rbx, %rsp
	add	$0x10, %rsp
again:
	/* load length of additional data */
	mov	0x0(%rsp), %rax

	/* if(length == 0) : end of list */
	/* write possible 0 to header */
	mov	%rax, 8(%rbx)
	cmp	$0, %rax
	jz	done

	/* save current pointer */
	mov	%rsp, 8(%rbx)

	/* skip additional data */
	add	%rax, %rsp

	/* load syscall-# */
	pop	%rax

	/* load syscall params */
	pop	%rdi
	pop	%rsi
	pop	%rdx
	pop	%r10
 	pop	%r8
	pop	%r9

	/* execute syscall */
	syscall

	/* check return value */
	pop	%rcx
	cmp	%rcx, %rax
	je	again

done:
	/* save return value */
	mov	%rax, (%rbx)

	/* stop */
	int3
Commit	Line	Data
d67b569f JD	1	#include "uml-config.h"
	2
	3	.globl syscall_stub
	4	.section .__syscall_stub, "x"
	5	syscall_stub:
	6	syscall
	7	/* We don't have 64-bit constants, so this constructs the address
	8	* we need.
	9	*/
	10	movq $(UML_CONFIG_STUB_DATA >> 32), %rbx
	11	salq $32, %rbx
	12	movq $(UML_CONFIG_STUB_DATA & 0xffffffff), %rcx
	13	or %rcx, %rbx
	14	movq %rax, (%rbx)
	15	int3
c5600490 JD	16
	17	.globl batch_syscall_stub
	18	batch_syscall_stub:
07bf731e BS	19	mov $(UML_CONFIG_STUB_DATA >> 32), %rbx
	20	sal $32, %rbx
	21	mov $(UML_CONFIG_STUB_DATA & 0xffffffff), %rax
	22	or %rax, %rbx
	23	/* load pointer to first operation */
	24	mov %rbx, %rsp
	25	add $0x10, %rsp
	26	again:
	27	/* load length of additional data */
	28	mov 0x0(%rsp), %rax
	29
	30	/* if(length == 0) : end of list */
	31	/* write possible 0 to header */
	32	mov %rax, 8(%rbx)
	33	cmp $0, %rax
	34	jz done
	35
	36	/* save current pointer */
	37	mov %rsp, 8(%rbx)
	38
	39	/* skip additional data */
	40	add %rax, %rsp
	41
	42	/* load syscall-# */
	43	pop %rax
	44
	45	/* load syscall params */
c5600490 JD	46	pop %rdi
	47	pop %rsi
	48	pop %rdx
	49	pop %r10
	50	pop %r8
	51	pop %r9
07bf731e BS	52
07bf731e BS	53	/* execute syscall */
c5600490	54	syscall
07bf731e BS	55
	56	/* check return value */
	57	pop %rcx
	58	cmp %rcx, %rax
	59	je again
	60
	61	done:
	62	/* save return value */
c5600490	63	mov %rax, (%rbx)
07bf731e BS	64
	65	/* stop */
	66	int3