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authorWaldemar Brodkorb <wbx@uclibc-ng.org>2016-05-18 18:41:24 +0200
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-05-18 18:41:24 +0200
commit6a8ccc95528f5e86a8770ed15ce89609b5b3dee9 (patch)
treebbd4df35b4d4a6a8b00d7a5e61fb2668b850ad62 /libpthread/linuxthreads/sysdeps/arm/pt-machine.h
parent398a27a5b323956344b4f831d892fed3bd9813c7 (diff)
remove linuxthreads.new, rename linuxthreads.old
Linuxthreads.new isn't really useful with the existence of NPTL/TLS for well supported architectures. There is no reason to use LT.new for ARM/MIPS or other architectures supporting NPTL/TLS. It is not available for noMMU architectures like Blackfin or FR-V. To simplify the live of the few uClibc-ng developers, LT.new is removed and LT.old is renamed to LT. LINUXTHREADS_OLD -> UCLIBC_HAS_LINUXTHREADS
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/arm/pt-machine.h')
-rw-r--r--libpthread/linuxthreads/sysdeps/arm/pt-machine.h68
1 files changed, 62 insertions, 6 deletions
diff --git a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
index 0a455b97d..fc17e9bc7 100644
--- a/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
+++ b/libpthread/linuxthreads/sysdeps/arm/pt-machine.h
@@ -1,6 +1,6 @@
/* Machine-dependent pthreads configuration and inline functions.
ARM version.
- Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Philip Blundell <philb@gnu.org>.
@@ -21,29 +21,85 @@
#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(__thumb2__)
+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;
+}
+
+#elif defined(__thumb__)
+
/* 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. */
/* Spinlock implementation; required. */
-PT_EI long int
-testandset (int *spinlock)
+PT_EI long int testandset (int *spinlock);
+PT_EI long int testandset (int *spinlock)
{
register unsigned int ret;
+ void *pc;
+ __asm__ __volatile__(
+ ".align 0\n"
+ "\tbx pc\n"
+ "\tnop\n"
+ "\t.arm\n"
+ "\tswp %0, %2, [%3]\n"
+ "\torr %1, pc, #1\n"
+ "\tbx %1\n"
+ "\t.force_thumb"
+ : "=r"(ret), "=r"(pc)
+ : "0"(1), "r"(spinlock));
+ return ret;
+}
+#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));
-
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. */