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m68knommu: use user stack pointer hardware on some ColdFire cores

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The more modern ColdFire parts (even if based on older version cores)
have separate user and supervisor stack pointers (a7 register).
Modify the ColdFire CPU setup and exception code to enable and use
this on parts that have it.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Greg Ungerer
2010-11-04 13:53:26 +10:00
parent 0762346034
commit 1c83af5f9d
7 changed files with 72 additions and 55 deletions
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13
arch/m68k/include/asm/processor.h
View File

@@ -20,23 +20,26 @@
static inline unsigned long rdusp(void)
{
#ifdef CONFIG_COLDFIRE
#ifdef CONFIG_COLDFIRE_SW_A7
extern unsigned int sw_usp;
return sw_usp;
#else
unsigned long usp;
__asm__ __volatile__("move %/usp,%0" : "=a" (usp));
register unsigned long usp __asm__("a0");
/* move %usp,%a0 */
__asm__ __volatile__(".word 0x4e68" : "=a" (usp));
return usp;
#endif
}
static inline void wrusp(unsigned long usp)
{
#ifdef CONFIG_COLDFIRE
#ifdef CONFIG_COLDFIRE_SW_A7
extern unsigned int sw_usp;
sw_usp = usp;
#else
__asm__ __volatile__("move %0,%/usp" : : "a" (usp));
register unsigned long a0 __asm__("a0") = usp;
/* move %a0,%usp */
__asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
#endif
}