diff options
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/xtensa/pt-machine.h')
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/xtensa/pt-machine.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/xtensa/pt-machine.h b/libpthread/linuxthreads/sysdeps/xtensa/pt-machine.h index 82d9b540c..0b7f58b63 100644 --- a/libpthread/linuxthreads/sysdeps/xtensa/pt-machine.h +++ b/libpthread/linuxthreads/sysdeps/xtensa/pt-machine.h @@ -21,6 +21,7 @@ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 +#include <bits/xtensa-config.h> #include <sys/syscall.h> #include <asm/unistd.h> @@ -34,6 +35,55 @@ extern long int testandset (int *spinlock); extern int __compare_and_swap (long int *p, long int oldval, long int newval); +#if XCHAL_HAVE_EXCLUSIVE + +/* Spinlock implementation; required. */ +PT_EI long int +testandset (int *spinlock) +{ + unsigned long tmp; + __asm__ volatile ( +" memw \n" +"1: l32ex %0, %1 \n" +" bnez %0, 2f \n" +" movi %0, 1 \n" +" s32ex %0, %1 \n" +" getex %0 \n" +" beqz %0, 1b \n" +" movi %0, 0 \n" +" memw \n" +"2: \n" + : "=&a" (tmp) + : "a" (spinlock) + : "memory" + ); + return tmp; +} + +PT_EI int +__compare_and_swap (long int *p, long int oldval, long int newval) +{ + unsigned long tmp; + unsigned long value; + __asm__ volatile ( +" memw \n" +"1: l32ex %0, %2 \n" +" bne %0, %4, 2f \n" +" mov %1, %3 \n" +" s32ex %1, %2 \n" +" getex %1 \n" +" beqz %1, 1b \n" +" memw \n" +"2: \n" + : "=&a" (tmp), "=&a" (value) + : "a" (p), "a" (newval), "a" (oldval) + : "memory" ); + + return tmp == oldval; +} + +#elif XCHAL_HAVE_S32C1I + /* Spinlock implementation; required. */ PT_EI long int testandset (int *spinlock) @@ -71,6 +121,12 @@ __compare_and_swap (long int *p, long int oldval, long int newval) return tmp == oldval; } +#else + +#error No hardware atomic operations + +#endif + /* Get some notion of the current stack. Need not be exactly the top of the stack, just something somewhere in the current frame. */ #define CURRENT_STACK_FRAME __builtin_frame_address (0) |