From 1c83af5f9d7e15a091f11394ad5916a7dcf1a99e Mon Sep 17 00:00:00 2001 From: Greg Ungerer Date: Thu, 4 Nov 2010 13:53:26 +1000 Subject: m68knommu: use user stack pointer hardware on some ColdFire cores 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 --- arch/m68k/include/asm/processor.h | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'arch/m68k/include/asm/processor.h') diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h index 7a6a759..278c69b 100644 --- a/arch/m68k/include/asm/processor.h +++ b/arch/m68k/include/asm/processor.h @@ -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 } -- cgit v1.1