src/runtime/x86-64-arch.h

   1 /* FIXME: Aren't preprocessor symbols with underscore prefixes
   2  * reserved for the system libraries? If so, it would be tidy to
   3  * rename flags like _X86_ARCH_H so their names are in a part of the
   4  * namespace that we control. */
   5 #ifndef _X86_64_ARCH_H
   6 #define _X86_64_ARCH_H
   7
   8 #ifndef SBCL_GENESIS_CONFIG
   9 #error genesis/config.h (or sbcl.h) must be included before this file
  10 #endif
  11
  12 #include "interr.h"                     /* for declaration of lose() */
  13
  14 #define ARCH_HAS_STACK_POINTER
  15 #define ALIEN_STACK_GROWS_DOWNWARD
  16
  17 /* FIXME: Do we also want
  18  *   #define ARCH_HAS_FLOAT_REGISTERS
  19  * here? (The answer wasn't obvious to me when merging the
  20  * architecture-abstracting patches for CSR's SPARC port. -- WHN 2002-02-15) */
  21
  22 #define COMPILER_BARRIER \
  23     do { __asm__ __volatile__ ( "" : : : "memory"); } while (0)
  24
  25 static inline void
  26 get_spinlock(volatile lispobj *word, unsigned long value)
  27 {
  28 #ifdef LISP_FEATURE_SB_THREAD
  29     u64 rax=0;
  30     if(*word==value)
  31         lose("recursive get_spinlock: 0x%x,%ld\n",word,value);
  32     do {
  33 #if defined(LISP_FEATURE_DARWIN)
  34         asm volatile
  35             ("xor %0,%0\n\
  36               lock/cmpxchg %1,%2"
  37              : "=a" (rax)
  38              : "r" (value), "m" (*word)
  39              : "memory", "cc");
  40 #else
  41         asm volatile
  42             ("xor %0,%0\n\
  43               lock cmpxchg %1,%2"
  44              : "=a" (rax)
  45              : "r" (value), "m" (*word)
  46              : "memory", "cc");
  47 #endif
  48     } while(rax!=0);
  49 #else
  50     *word=value;
  51 #endif
  52 }
  53
  54 static inline void
  55 release_spinlock(volatile lispobj *word)
  56 {
  57     /* See comment in RELEASE-SPINLOCK in target-thread.lisp. */
  58     COMPILER_BARRIER;
  59     *word=0;
  60     COMPILER_BARRIER;
  61 }
  62
  63 static inline lispobj
  64 swap_lispobjs(volatile lispobj *dest, lispobj value)
  65 {
  66     lispobj old_value;
  67     asm volatile
  68         ("lock xchg %0,(%1)"
  69          : "=r" (old_value)
  70          : "r" (dest), "0" (value)
  71          : "memory");
  72     return old_value;
  73 }
  74
  75 #endif /* _X86_64_ARCH_H */