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Open Menu / arch / mips / kernel / r4k_scall.S
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/* $Id: r4k_scall.S,v 1.1 1997/06/06 09:33:08 ralf Exp $
 * r4k_scall.S: R4xx0 specific code to handle system calls.
 *
 * Copyright (C) 1994, 1995, 1996 by Ralf Baechle and Andreas Busse
 *
 * Multi-arch abstraction and beautification:
 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
 */
#include <asm/asm.h>
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/fpregdef.h>
#include <asm/mipsconfig.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>

	.set	noreorder
	.set	mips3
	.align	5
NESTED(r4k_do_syscalls, 64, sp)
	subu	sp, 64
	sw	ra, 56(sp)
	sll	a2, a2, PTRLOG
	lw	t0, dst(a2)
	move	t2, a1
	jalr	t0
	 lw	t0, PT_R29(a0)		# get old user stack pointer
7:
	lw	t1, 24(t0)		# parameter #7 from usp
	sw	t1, 24(sp)
6:
	lw	t1, 20(t0)		# parameter #6 from usp
	sw	t1, 20(sp)
5:
	lw	t1, 16(t0)		# parameter #5 from usp
	sw	t1, 16(sp)
4:
	lw	a3, PT_R7(a0)		# 4 args
3:
	lw	a2, PT_R6(a0)		# 3 args
2:
	lw	a1, PT_R5(a0)		# 2 args
1:
	jalr	t2			# 1 args
	 lw	a0, PT_R4(a0)

	.set	reorder
	lw	ra, 56(sp)
	addiu	sp, 64
	jr	ra
0:
	jalr	t2			# 0 args, just pass a0
	 nop
	lw	ra, 56(sp)
	addiu	sp, 64
	jr	ra
	 nop
	END(r4k_do_syscalls)

		.rdata
		.align	PTRLOG
dst:		PTR	0b, 1b, 2b, 3b, 4b, 5b, 6b, 7b

		.section	__ex_table,"a"
		PTR	7b,bad_stack
		PTR	6b,bad_stack
		PTR	5b,bad_stack
		.previous