Subject: + mips-fpu-fix-conflict-of-register-usage.patch added to -mm tree
To: chenhc@xxxxxxxxxx,aaro.koskinen@xxxxxx,aba@xxxxxxxxx,linux@xxxxxxxxxxxx,paul.burton@xxxxxxxxxx,pebolle@xxxxxxxxxx,ralf@xxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 13 Mar 2014 14:58:06 -0700
The patch titled
Subject: mips: fpu: fix conflict of register usage
has been added to the -mm tree. Its filename is
mips-fpu-fix-conflict-of-register-usage.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mips-fpu-fix-conflict-of-register-usage.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mips-fpu-fix-conflict-of-register-usage.patch
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------------------------------------------------------
From: Huacai Chen <chenhc@xxxxxxxxxx>
Subject: mips: fpu: fix conflict of register usage
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@xxxxxxxxxx>
Tested-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Tested-by: Andreas Barth <aba@xxxxxxxxx>
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
Tested-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Paul Bolle <pebolle@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/mips/kernel/r4k_fpu.S | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff -puN arch/mips/kernel/r4k_fpu.S~mips-fpu-fix-conflict-of-register-usage arch/mips/kernel/r4k_fpu.S
--- a/arch/mips/kernel/r4k_fpu.S~mips-fpu-fix-conflict-of-register-usage
+++ a/arch/mips/kernel/r4k_fpu.S
@@ -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)
_
Patches currently in -mm which might be from chenhc@xxxxxxxxxx are
mips-replace-config_mips64-and-config_mips32_r2.patch
mips-fpu-fix-conflict-of-register-usage.patch
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