diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 1997-03-25 23:40:36 +0000 |
|---|---|---|
| committer | <ralf@linux-mips.org> | 1997-03-25 23:40:36 +0000 |
| commit | 7206675c40394c78a90e74812bbdbf8cf3cca1be (patch) | |
| tree | 251895cf5a0008e2b4ce438cb01ad4d55fb5b97b /arch/mips/kernel/r2300_scall.S | |
| parent | beb116954b9b7f3bb56412b2494b562f02b864b1 (diff) | |
Import of Linux/MIPS 2.1.14.2
Diffstat (limited to 'arch/mips/kernel/r2300_scall.S')
| -rw-r--r-- | arch/mips/kernel/r2300_scall.S | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/mips/kernel/r2300_scall.S b/arch/mips/kernel/r2300_scall.S new file mode 100644 index 000000000..358f46664 --- /dev/null +++ b/arch/mips/kernel/r2300_scall.S @@ -0,0 +1,86 @@ +/* $Id: r2300_scall.S,v 1.3 1996/06/29 12:41:08 dm Exp $ + * r2300_scall.S: R2000/R3000 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/segment.h> +#include <asm/stackframe.h> + +/* + * do_syscall calls the function in a1 with upto 7 arguments. If over + * four arguments are being requested, the additional arguments will + * be copied from the user stack pointed to by a0->reg29. + * + * a0 (struct pt_regs *) pointer to user registers + * a1 (syscall_t) pointer to syscall to do + * a2 (int) number of arguments to syscall + */ + .set noreorder + .text +NESTED(r2300_do_syscalls, 32, sp) + subu sp,32 + sw ra,28(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 + nop # delay slot + sw t1,24(sp) +6: + lw t1,20(t0) # parameter #6 from usp + nop # delay slot + sw t1,20(sp) +5: + lw t1,16(t0) # parameter #5 from usp + nop # delay slot + 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) + + lw ra,28(sp) + addiu sp,32 + jr ra + nop + +0: + jalr t2 # 0 args, just pass a0 + lw ra,28(sp) + addiu sp,32 + + jr ra + nop # delay slot + END(r2300_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 + .text |