diff options
Diffstat (limited to 'linux/src/include/asm-i386/semaphore.h')
| -rw-r--r-- | linux/src/include/asm-i386/semaphore.h | 30 |
1 files changed, 18 insertions, 12 deletions
diff --git a/linux/src/include/asm-i386/semaphore.h b/linux/src/include/asm-i386/semaphore.h index 1486d1c1..18e12c10 100644 --- a/linux/src/include/asm-i386/semaphore.h +++ b/linux/src/include/asm-i386/semaphore.h @@ -30,6 +30,10 @@ struct semaphore { #define MUTEX ((struct semaphore) { 1, 0, 0, NULL }) #define MUTEX_LOCKED ((struct semaphore) { 0, 0, 0, NULL }) +/* Special register calling convention: + * eax contains return address + * ecx contains semaphore address + */ asmlinkage void down_failed(void /* special register calling convention */); asmlinkage void up_wakeup(void /* special register calling convention */); @@ -41,20 +45,21 @@ extern void __up(struct semaphore * sem); * "down_failed" is a special asm handler that calls the C * routine that actually waits. See arch/i386/lib/semaphore.S */ -extern inline void down(struct semaphore * sem) +static inline void down(struct semaphore * sem) { + int d0; __asm__ __volatile__( "# atomic down operation\n\t" "movl $1f,%%eax\n\t" #ifdef __SMP__ "lock ; " #endif - "decl 0(%0)\n\t" + "decl %1\n\t" "js " SYMBOL_NAME_STR(down_failed) "\n" "1:\n" - :/* no outputs */ + :"=&a" (d0), "=m" (sem->count) :"c" (sem) - :"ax","dx","memory"); + :"memory"); } /* @@ -81,7 +86,7 @@ asmlinkage int down_failed_interruptible(void); /* params in registers */ * process can be killed. The down_failed_interruptible routine * returns negative for signalled and zero for semaphore acquired. */ -extern inline int down_interruptible(struct semaphore * sem) +static inline int down_interruptible(struct semaphore * sem) { int ret ; @@ -91,13 +96,13 @@ extern inline int down_interruptible(struct semaphore * sem) #ifdef __SMP__ "lock ; " #endif - "decl 0(%1)\n\t" + "decl %1\n\t" "js " SYMBOL_NAME_STR(down_failed_interruptible) "\n\t" "xorl %%eax,%%eax\n" "2:\n" - :"=a" (ret) + :"=&a" (ret), "=m" (sem->count) :"c" (sem) - :"ax","dx","memory"); + :"memory"); return(ret) ; } @@ -108,20 +113,21 @@ extern inline int down_interruptible(struct semaphore * sem) * The default case (no contention) will result in NO * jumps for both down() and up(). */ -extern inline void up(struct semaphore * sem) +static inline void up(struct semaphore * sem) { + int d0; __asm__ __volatile__( "# atomic up operation\n\t" "movl $1f,%%eax\n\t" #ifdef __SMP__ "lock ; " #endif - "incl 0(%0)\n\t" + "incl %1\n\t" "jle " SYMBOL_NAME_STR(up_wakeup) "\n1:" - :/* no outputs */ + :"=&a" (d0), "=m" (sem->count) :"c" (sem) - :"ax", "dx", "memory"); + :"memory"); } #endif |