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MIPS: FPU: Fix conflict of register usage

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In _restore_fp_context/_restore_fp_context32, t0 is used for both
CP0_Status and CP1_FCSR. This is a mistake and cause FP exeception on
boot, so fix it.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Tested-by: Andreas Barth <aba@ayous.org>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/6507/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Huacai Chen 2014-02-07 22:31:33 +08:00 committed by Ralf Baechle
parent f5868f05dc
commit b616365e6d
1 changed files with 4 additions and 4 deletions
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8
arch/mips/kernel/r4k_fpu.S
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@ -146,7 +146,7 @@ LEAF(_save_fp_context32)
* - cp1 status/control register
*/
LEAF(_restore_fp_context)
EX lw t0, SC_FPC_CSR(a0)
EX lw t1, SC_FPC_CSR(a0)
#if defined(CONFIG_64BIT) || defined(CONFIG_CPU_MIPS32_R2)
.set push
@ -191,7 +191,7 @@ LEAF(_restore_fp_context)
EX ldc1 $f26, SC_FPREGS+208(a0)
EX ldc1 $f28, SC_FPREGS+224(a0)
EX ldc1 $f30, SC_FPREGS+240(a0)
ctc1 t0, fcr31
ctc1 t1, fcr31
jr ra
li v0, 0 # success
END(_restore_fp_context)
@ -199,7 +199,7 @@ LEAF(_restore_fp_context)
#ifdef CONFIG_MIPS32_COMPAT
LEAF(_restore_fp_context32)
/* Restore an o32 sigcontext. */
EX lw t0, SC32_FPC_CSR(a0)
EX lw t1, SC32_FPC_CSR(a0)
mfc0 t0, CP0_STATUS
sll t0, t0, 5
@ -239,7 +239,7 @@ LEAF(_restore_fp_context32)
EX ldc1 $f26, SC32_FPREGS+208(a0)
EX ldc1 $f28, SC32_FPREGS+224(a0)
EX ldc1 $f30, SC32_FPREGS+240(a0)
ctc1 t0, fcr31
ctc1 t1, fcr31
jr ra
li v0, 0 # success
END(_restore_fp_context32)