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ARM: 6868/1: Preserve the VFP state during fork 

VFP registers d16-d31 are callee saved registers and must be preserved
during function calls, including fork(). The VFP configuration should
also be preserved. The patch copies the full VFP state to the child
process.

Reported-by: Paul Wright <paul.wright@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2011-04-06 16:17:17 +01:00 committed by Russell King
parent 2e82669acf
commit c98c09773d
1 changed files with 12 additions and 0 deletions
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12
arch/arm/vfp/vfpmodule.c
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@ -78,6 +78,14 @@ static void vfp_thread_exit(struct thread_info *thread)
put_cpu(); put_cpu();
} }
static void vfp_thread_copy(struct thread_info *thread)
{
struct thread_info *parent = current_thread_info();
vfp_sync_hwstate(parent);
thread->vfpstate = parent->vfpstate;
}
/* /*
* When this function is called with the following 'cmd's, the following * When this function is called with the following 'cmd's, the following
* is true while this function is being run: * is true while this function is being run:
@ -148,6 +156,10 @@ static int vfp_notifier(struct notifier_block *self, unsigned long cmd, void *v)
case THREAD_NOTIFY_EXIT: case THREAD_NOTIFY_EXIT:
vfp_thread_exit(thread); vfp_thread_exit(thread);
break; break;
case THREAD_NOTIFY_COPY:
vfp_thread_copy(thread);
break;
} }
return NOTIFY_DONE; return NOTIFY_DONE;