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MIPS: kernel: scall32-o32: Use EVA wrappers to fetch syscall arguments 

Arguments 4-8 are stored on user's stack, so use the EVA instructions
to fetch them if EVA is enabled.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
This commit is contained in:
Markos Chandras 2013-12-04 14:35:28 +00:00 committed by Ralf Baechle
parent aa1af47f5d
commit 86bdb2779d
1 changed files with 5 additions and 4 deletions
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9
arch/mips/kernel/scall32-o32.S
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@ -6,6 +6,7 @@
* Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org> * Copyright (C) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
* Copyright (C) 2001 MIPS Technologies, Inc. * Copyright (C) 2001 MIPS Technologies, Inc.
* Copyright (C) 2004 Thiemo Seufer * Copyright (C) 2004 Thiemo Seufer
* Copyright (C) 2014 Imagination Technologies Ltd.
*/ */
#include <linux/errno.h> #include <linux/errno.h>
#include <asm/asm.h> #include <asm/asm.h>
@ -74,10 +75,10 @@ NESTED(handle_sys, PT_SIZE, sp)
.set noreorder .set noreorder
.set nomacro .set nomacro
1: lw t5, 16(t0) # argument #5 from usp 1: user_lw(t5, 16(t0)) # argument #5 from usp
4: lw t6, 20(t0) # argument #6 from usp 4: user_lw(t6, 20(t0)) # argument #6 from usp
3: lw t7, 24(t0) # argument #7 from usp 3: user_lw(t7, 24(t0)) # argument #7 from usp
2: lw t8, 28(t0) # argument #8 from usp 2: user_lw(t8, 28(t0)) # argument #8 from usp
sw t5, 16(sp) # argument #5 to ksp sw t5, 16(sp) # argument #5 to ksp
sw t6, 20(sp) # argument #6 to ksp sw t6, 20(sp) # argument #6 to ksp