From 5379220e5849358eda0dde24feaa4a5db6f142f6 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Tue, 24 Oct 2000 03:24:38 +0000 Subject: __restore_flags had wrong constraints. The resulting register corruption probably wasn't really problematic. Anyway, the the fixed version shaves of a few kb (!) of kernel size. Overhaul xchg(). --- include/asm-mips64/system.h | 127 +++++++++++++++++++++----------------------- 1 file changed, 61 insertions(+), 66 deletions(-) (limited to 'include/asm-mips64/system.h') diff --git a/include/asm-mips64/system.h b/include/asm-mips64/system.h index ca81b8bf5..fc9407332 100644 --- a/include/asm-mips64/system.h +++ b/include/asm-mips64/system.h @@ -1,5 +1,4 @@ -/* $Id: system.h,v 1.5 2000/01/27 07:48:08 kanoj Exp $ - * +/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. @@ -60,50 +59,52 @@ __cli(void) : "$1", "memory"); } -#define __save_flags(x) \ -__asm__ __volatile__( \ - ".set\tnoreorder\n\t" \ - "mfc0\t%0,$12\n\t" \ - ".set\treorder" \ +#define __save_flags(x) \ +__asm__ __volatile__( \ + ".set\tnoreorder\n\t" \ + "mfc0\t%0,$12\n\t" \ + ".set\treorder" \ : "=r" (x)) -#define __save_and_cli(x) \ -__asm__ __volatile__( \ - ".set\tnoreorder\n\t" \ - ".set\tnoat\n\t" \ - "mfc0\t%0,$12\n\t" \ - "ori\t$1,%0,1\n\t" \ - "xori\t$1,1\n\t" \ - "mtc0\t$1,$12\n\t" \ - "nop\n\t" \ - "nop\n\t" \ - "nop\n\t" \ - ".set\tat\n\t" \ - ".set\treorder" \ - : "=r" (x) \ - : /* no inputs */ \ +#define __save_and_cli(x) \ +__asm__ __volatile__( \ + ".set\tnoreorder\n\t" \ + ".set\tnoat\n\t" \ + "mfc0\t%0,$12\n\t" \ + "ori\t$1,%0,1\n\t" \ + "xori\t$1,1\n\t" \ + "mtc0\t$1,$12\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + ".set\tat\n\t" \ + ".set\treorder" \ + : "=r" (x) \ + : /* no inputs */ \ : "$1", "memory") -extern void __inline__ -__restore_flags(int flags) -{ - __asm__ __volatile__( - ".set\tnoreorder\n\t" - "mfc0\t$8,$12\n\t" - "li\t$9,0xff00\n\t" - "and\t$8,$9\n\t" - "nor\t$9,$0,$9\n\t" - "and\t%0,$9\n\t" - "or\t%0,$8\n\t" - "mtc0\t%0,$12\n\t" - "nop\n\t" - "nop\n\t" - "nop\n\t" - ".set\treorder" - : /* no output */ - : "r" (flags) - : "$8", "$9", "memory"); -} +#define __restore_flags(flags) \ +do { \ + unsigned long __tmp1; \ + \ + __asm__ __volatile__( \ + ".set\tnoreorder\t\t\t# __restore_flags\n\t" \ + ".set\tnoat\n\t" \ + "mfc0\t$1, $12\n\t" \ + "andi\t%0, 1\n\t" \ + "ori\t$1, 1\n\t" \ + "xori\t$1, 1\n\t" \ + "or\t%0, $1\n\t" \ + "mtc0\t%0, $12\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + "nop\n\t" \ + ".set\tat\n\t" \ + ".set\treorder" \ + : "=r" (__tmp1) \ + : "0" (flags) \ + : "$1", "memory"); \ +} while(0) #ifdef CONFIG_SMP @@ -200,41 +201,38 @@ extern __inline__ unsigned long xchg_u32(volatile int * m, unsigned long val) unsigned long dummy; __asm__ __volatile__( - ".set\tnoreorder\n\t" + ".set\tnoreorder\t\t\t# xchg_u32\n\t" ".set\tnoat\n\t" - "ll\t%0,(%1)\n" - "1:\tmove\t$1,%2\n\t" - "sc\t$1,(%1)\n\t" - "beqzl\t$1,1b\n\t" - "lld\t%0,(%1)\n\t" + "ll\t%0, %3\n" + "1:\tmove\t$1, %2\n\t" + "sc\t$1, %1\n\t" + "beqzl\t$1, 1b\n\t" + " ll\t%0, %3\n\t" ".set\tat\n\t" ".set\treorder" - : "=r" (val), "=r" (m), "=r" (dummy) - : "1" (m), "2" (val) + : "=r" (val), "=o" (*m), "=r" (dummy) + : "o" (*m), "2" (val) : "memory"); return val; } -/* - * Only used for 64 bit kernel. - */ extern __inline__ unsigned long xchg_u64(volatile long * m, unsigned long val) { unsigned long dummy; __asm__ __volatile__( - ".set\tnoreorder\n\t" + ".set\tnoreorder\t\t\t# xchg_u64\n\t" ".set\tnoat\n\t" - "lld\t%0,(%1)\n" - "1:\tmove\t$1,%2\n\t" - "scd\t$1,(%1)\n\t" - "beqzl\t$1,1b\n\t" - "lld\t%0,(%1)\n\t" + "lld\t%0, %3\n" + "1:\tmove\t$1, %2\n\t" + "scd\t$1, %1\n\t" + "beqzl\t$1, 1b\n\t" + " lld\t%0, %3\n\t" ".set\tat\n\t" ".set\treorder" - : "=r" (val), "=r" (m), "=r" (dummy) - : "1" (m), "2" (val) + : "=r" (val), "=o" (*m), "=r" (dummy) + : "o" (*m), "2" (val) : "memory"); return val; @@ -243,11 +241,9 @@ extern __inline__ unsigned long xchg_u64(volatile long * m, unsigned long val) #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) #define tas(ptr) (xchg((ptr),1)) -/* This function doesn't exist, so you'll get a linker error if something - tries to do an invalid xchg(). */ -extern void __xchg_called_with_bad_pointer(void); -static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int size) +static __inline__ unsigned long +__xchg(unsigned long x, volatile void * ptr, int size) { switch (size) { case 4: @@ -255,7 +251,6 @@ static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, int case 8: return xchg_u64(ptr, x); } - __xchg_called_with_bad_pointer(); return x; } -- cgit v1.2.3