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| author |   Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2006-05-23 00:47:41 +0900 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2006-06-19 17:39:13 +0100 |
| commit | c138e12f3a2e0421a4c8edf02587d2d394418679 (patch) | |
| tree | 66abbf27cbfc9030958b469aa4d826242417a752 /arch | |
| parent | [MIPS] Malta: Handle byteswapping hardare bug in big endian mode. (diff) | |
| download | linux-dev-c138e12f3a2e0421a4c8edf02587d2d394418679.tar.xz linux-dev-c138e12f3a2e0421a4c8edf02587d2d394418679.zip | |
[MIPS] Fix fpu_save_double on 64-bit.
> Without this fix, _save_fp() in 64-bit kernel is seriously broken.
>
> ffffffff8010bec0 <_save_fp>:
> ffffffff8010bec0: 400d6000 mfc0 t1,c0_status
> ffffffff8010bec4: 000c7140 sll t2,t0,0x5
> ffffffff8010bec8: 05c10011 bgez t2,ffffffff8010bf10 <_save_fp+0x50>
> ffffffff8010becc: 00000000 nop
> ffffffff8010bed0: f4810328 sdc1 $f1,808(a0)
> ...
Fix register usage in fpu_save_double() and make fpu_restore_double()
more symmetric with fpu_save_double().
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/kernel/r4k_switch.S | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/arch/mips/kernel/r4k_switch.S b/arch/mips/kernel/r4k_switch.S index 0b1b54acee9f..db94e556fc97 100644 --- a/arch/mips/kernel/r4k_switch.S +++ b/arch/mips/kernel/r4k_switch.S @@ -75,8 +75,8 @@ and t0, t0, t1 LONG_S t0, ST_OFF(t3) - fpu_save_double a0 t1 t0 t2 # c0_status passed in t1 - # clobbers t0 and t2 + fpu_save_double a0 t0 t1 # c0_status passed in t0 + # clobbers t1 1: /* @@ -129,9 +129,9 @@ */ LEAF(_save_fp) #ifdef CONFIG_64BIT - mfc0 t1, CP0_STATUS + mfc0 t0, CP0_STATUS #endif - fpu_save_double a0 t1 t0 t2 # clobbers t1 + fpu_save_double a0 t0 t1 # clobbers t1 jr ra END(_save_fp) @@ -139,7 +139,10 @@ LEAF(_save_fp) * Restore a thread's fp context. */ LEAF(_restore_fp) - fpu_restore_double a0, t1 # clobbers t1 +#ifdef CONFIG_64BIT + mfc0 t0, CP0_STATUS +#endif + fpu_restore_double a0 t0 t1 # clobbers t1 jr ra END(_restore_fp) |