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| author | Michael Trimarchi <trimarchi@gandalf.sssup.it> | 2009-04-03 21:32:33 +0400 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-04-04 19:48:11 +0400 |
| commit | 01ab10393c510342ec4ce85df11ccfa3df06bbb2 (patch) | |
| tree | ebf0493fa7b53941f830f8b300037f834eb85e59 /arch/sh/kernel/process_32.c | |
| parent | a27873cd234b4248dda342721d6262943e5fa235 (diff) | |
| download | linux-01ab10393c510342ec4ce85df11ccfa3df06bbb2.tar.xz | |
sh: Fix up DSP context save/restore.
There were a number of issues with the DSP context save/restore code,
mostly left-over relics from when it was introduced on SH3-DSP with
little follow-up testing, resulting in things like task_pt_dspregs()
referencing incorrect state on the stack.
This follows the MIPS convention of tracking the DSP state in the
thread_struct and handling the state save/restore in switch_to() and
finish_arch_switch() respectively. The regset interface is also updated,
which allows us to finally be rid of task_pt_dspregs() and the special
cased task_pt_regs().
Signed-off-by: Michael Trimarchi <michael@evidence.eu.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/process_32.c')
| -rw-r--r-- | arch/sh/kernel/process_32.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index ddafbbbab2ab..0747fabd73a7 100644 --- a/arch/sh/kernel/process_32.c +++ b/arch/sh/kernel/process_32.c @@ -176,14 +176,26 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp, { struct thread_info *ti = task_thread_info(p); struct pt_regs *childregs; -#if defined(CONFIG_SH_FPU) +#if defined(CONFIG_SH_FPU) || defined(CONFIG_SH_DSP) struct task_struct *tsk = current; +#endif +#if defined(CONFIG_SH_FPU) unlazy_fpu(tsk, regs); p->thread.fpu = tsk->thread.fpu; copy_to_stopped_child_used_math(p); #endif +#if defined(CONFIG_SH_DSP) + if (is_dsp_enabled(tsk)) { + /* We can use the __save_dsp or just copy the struct: + * __save_dsp(p); + * p->thread.dsp_status.status |= SR_DSP + */ + p->thread.dsp_status = tsk->thread.dsp_status; + } +#endif + childregs = task_pt_regs(p); *childregs = *regs; |