60 lines
1.7 KiB
Diff
60 lines
1.7 KiB
Diff
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--- uClibc-0.9.29/libpthread/linuxthreads.old/sysdeps/xtensa/pt-machine.h.orig 2008-09-12 09:51:50.000000000 -0700
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+++ uClibc-0.9.29/libpthread/linuxthreads.old/sysdeps/xtensa/pt-machine.h 2008-10-04 12:14:57.000000000 -0700
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@@ -26,19 +26,51 @@
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#include <asm/unistd.h>
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#ifndef PT_EI
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-# define PT_EI __extern_always_inline
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+# define PT_EI extern inline __attribute__ ((gnu_inline))
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#endif
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-/* Memory barrier. */
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#define MEMORY_BARRIER() __asm__ ("memw" : : : "memory")
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+#define HAS_COMPARE_AND_SWAP
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+
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+extern long int testandset (int *spinlock);
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+extern int __compare_and_swap (long int *p, long int oldval, long int newval);
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/* Spinlock implementation; required. */
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PT_EI long int
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testandset (int *spinlock)
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{
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- int unused = 0;
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- return INTERNAL_SYSCALL (xtensa, , 4, SYS_XTENSA_ATOMIC_SET,
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- spinlock, 1, unused);
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+ unsigned long tmp;
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+ __asm__ volatile (
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+" movi %0, 0 \n"
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+" wsr %0, SCOMPARE1 \n"
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+" movi %0, 1 \n"
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+" s32c1i %0, %1, 0 \n"
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+ : "=&a" (tmp)
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+ : "a" (spinlock)
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+ : "memory"
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+ );
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+ return tmp;
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+}
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+
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+PT_EI int
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+__compare_and_swap (long int *p, long int oldval, long int newval)
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+{
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+ unsigned long tmp;
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+ unsigned long value;
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+ __asm__ volatile (
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+"1: l32i %0, %2, 0 \n"
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+" bne %0, %4, 2f \n"
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+" wsr %0, SCOMPARE1 \n"
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+" mov %1, %0 \n"
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+" mov %0, %3 \n"
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+" s32c1i %0, %2, 0 \n"
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+" bne %1, %0, 1b \n"
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+"2: \n"
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+ : "=&a" (tmp), "=&a" (value)
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+ : "a" (p), "a" (newval), "a" (oldval)
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+ : "memory" );
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+
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+ return tmp == oldval;
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}
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/* Get some notion of the current stack. Need not be exactly the top
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