diff options
Diffstat (limited to 'libpthread/linuxthreads.old/sysdeps')
| -rw-r--r-- | libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h | 56 |
1 files changed, 49 insertions, 7 deletions
diff --git a/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h b/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h index 438c12ab9..2b877f980 100644 --- a/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h +++ b/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h @@ -21,12 +21,50 @@ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 -#include <features.h> +#include <sys/syscall.h> +#include <unistd.h> #ifndef PT_EI # define PT_EI __extern_always_inline #endif +#if defined(__thumb__) +#if defined(__USE_LDREXSTREX__) +PT_EI long int ldrex(int *spinlock) +{ + long int ret; + __asm__ __volatile__( + "ldrex %0, [%1]\n" + : "=r"(ret) + : "r"(spinlock) : "memory"); + return ret; +} + +PT_EI long int strex(int val, int *spinlock) +{ + long int ret; + __asm__ __volatile__( + "strex %0, %1, [%2]\n" + : "=r"(ret) + : "r" (val), "r"(spinlock) : "memory"); + return ret; +} + +/* Spinlock implementation; required. */ +PT_EI long int +testandset (int *spinlock) +{ + register unsigned int ret; + + do { + ret = ldrex(spinlock); + } while (strex(1, spinlock)); + + return ret; +} + +#else /* __USE_LDREXSTREX__ */ + /* This will not work on ARM1 or ARM2 because SWP is lacking on those machines. Unfortunately we have no way to detect this at compile time; let's hope nobody tries to use one. */ @@ -36,8 +74,6 @@ PT_EI long int testandset (int *spinlock); PT_EI long int testandset (int *spinlock) { register unsigned int ret; - -#if defined(__thumb__) void *pc; __asm__ __volatile__( ".align 0\n" @@ -50,15 +86,21 @@ PT_EI long int testandset (int *spinlock) "\t.force_thumb" : "=r"(ret), "=r"(pc) : "0"(1), "r"(spinlock)); -#else + return ret; +} +#endif +#else /* __thumb__ */ + +PT_EI long int testandset (int *spinlock); +PT_EI long int testandset (int *spinlock) +{ + register unsigned int ret; __asm__ __volatile__("swp %0, %1, [%2]" : "=r"(ret) : "0"(1), "r"(spinlock)); -#endif - return ret; } - +#endif /* Get some notion of the current stack. Need not be exactly the top of the stack, just something somewhere in the current frame. */ |