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| author | Maciej W. Rozycki <macro@linux-mips.org> | 2015-04-04 00:27:48 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-08 01:10:37 +0200 |
| commit | 9b26616c8d9dae53fbac7f7cb2c6dd1308102976 (patch) | |
| tree | d4249bd953d4fa955cecd1283cc0f518df83f8a2 /arch/mips/loongson | |
| parent | MIPS: math-emu: Make ABS.fmt and NEG.fmt arithmetic again (diff) | |
| download | linux-9b26616c8d9dae53fbac7f7cb2c6dd1308102976.tar.xz linux-9b26616c8d9dae53fbac7f7cb2c6dd1308102976.zip | |
MIPS: Respect the ISA level in FCSR handling
Define the central place the default FCSR value is set from, initialised
in `cpu_probe'. Determine the FCSR mask applied to values written to
the register with CTC1 in the full emulation mode and via ptrace(2),
according to the ISA level of processor hardware or the writability of
bits 31:18 if actual FPU hardware is used.
Software may rely on FCSR bits whose functions our emulator does not
implement, so it should not allow them to be set or software may get
confused. For ptrace(2) it's just sanity.
[ralf@linux-mips.org: Fixed double inclusion of <asm/current.h>.]
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9711/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/loongson')
| -rw-r--r-- | arch/mips/loongson/loongson-3/cop2-ex.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/loongson/loongson-3/cop2-ex.c b/arch/mips/loongson/loongson-3/cop2-ex.c index b03e37d2071a..ea13764d0a03 100644 --- a/arch/mips/loongson/loongson-3/cop2-ex.c +++ b/arch/mips/loongson/loongson-3/cop2-ex.c @@ -43,7 +43,7 @@ static int loongson_cu2_call(struct notifier_block *nfb, unsigned long action, if (!fpu_owned) { set_thread_flag(TIF_USEDFPU); if (!used_math()) { - _init_fpu(); + _init_fpu(current->thread.fpu.fcr31); set_used_math(); } else _restore_fp(current); |