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/* $Id: r4k_scall.S,v 1.4 1996/06/29 12:41:09 dm 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
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