[linux-2.6-block.git] / arch / x86 / um / stub_64.S

/* SPDX-License-Identifier: GPL-2.0 */
#include <as-layout.h>

.section .__syscall_stub, "ax"
	.globl batch_syscall_stub
batch_syscall_stub:
	/* %rsp has the pointer to first operation */
	mov	%rsp, %rbx
	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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
37185b33	2	#include <as-layout.h>
d67b569f	3
276c974a	4	.section .__syscall_stub, "ax"
c5600490 JD	5	.globl batch_syscall_stub
c5600490 JD	6	batch_syscall_stub:
9f0b4807 JB	7	/* %rsp has the pointer to first operation */
9f0b4807 JB	8	mov %rsp, %rbx
07bf731e BS	9	add $0x10, %rsp
	10	again:
	11	/* load length of additional data */
	12	mov 0x0(%rsp), %rax
	13
	14	/* if(length == 0) : end of list */
	15	/* write possible 0 to header */
	16	mov %rax, 8(%rbx)
	17	cmp $0, %rax
	18	jz done
	19
	20	/* save current pointer */
	21	mov %rsp, 8(%rbx)
	22
	23	/* skip additional data */
	24	add %rax, %rsp
	25
	26	/* load syscall-# */
	27	pop %rax
	28
	29	/* load syscall params */
c5600490 JD	30	pop %rdi
	31	pop %rsi
	32	pop %rdx
	33	pop %r10
	34	pop %r8
	35	pop %r9
07bf731e BS	36
07bf731e BS	37	/* execute syscall */
c5600490	38	syscall
07bf731e BS	39
	40	/* check return value */
	41	pop %rcx
	42	cmp %rcx, %rax
	43	je again
	44
	45	done:
	46	/* save return value */
c5600490	47	mov %rax, (%rbx)
07bf731e BS	48
	49	/* stop */
	50	int3