From 8b281334a0bf4bce28d0f877cf0bbddd41ac25ea Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@redhat.com>
Date: Sat, 26 Nov 2011 15:57:37 -0800
Subject: m68k-linux: Implement atomic operations via syscall.

libgcc/
	* config/m68k/linux.h (TARGET_INIT_LIBFUNCS): New.
	* config/m68k/m68k.c (m68k_init_sync_libfuncs): New.
gcc/
	* config/m68k/linux-atomic.c: New file.
	* config/m68k/t-linux: New file.
	* config.host (m68k-uclinux, m68k-linux): Use it.

From-SVN: r181746
---
 gcc/config/m68k/linux.h | 4 ++++
 gcc/config/m68k/m68k.c  | 8 ++++++++
 2 files changed, 12 insertions(+)

(limited to 'gcc/config/m68k')

diff --git a/gcc/config/m68k/linux.h b/gcc/config/m68k/linux.h
index 70738d2..325faf7 100644
--- a/gcc/config/m68k/linux.h
+++ b/gcc/config/m68k/linux.h
@@ -235,3 +235,7 @@ along with GCC; see the file COPYING3.  If not see
 
 #undef  WCHAR_TYPE_SIZE
 #define WCHAR_TYPE_SIZE BITS_PER_WORD
+
+/* Install the __sync libcalls.  */
+#undef TARGET_INIT_LIBFUNCS
+#define TARGET_INIT_LIBFUNCS  m68k_init_sync_libfuncs
diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c
index 51a04ed..61267a8 100644
--- a/gcc/config/m68k/m68k.c
+++ b/gcc/config/m68k/m68k.c
@@ -47,6 +47,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "insn-codes.h"
 #include "ggc.h"
 #include "opts.h"
+#include "optabs.h"
 
 enum reg_class regno_reg_class[] =
 {
@@ -164,6 +165,7 @@ static rtx m68k_function_arg (cumulative_args_t, enum machine_mode,
 			      const_tree, bool);
 static bool m68k_cannot_force_const_mem (enum machine_mode mode, rtx x);
 static bool m68k_output_addr_const_extra (FILE *, rtx);
+static void m68k_init_sync_libfuncs (void) ATTRIBUTE_UNUSED;
 
 /* Initialize the GCC target structure.  */
 
@@ -6524,4 +6526,10 @@ m68k_conditional_register_usage (void)
     fixed_regs[PIC_REG] = call_used_regs[PIC_REG] = 1;
 }
 
+static void
+m68k_init_sync_libfuncs (void)
+{
+  init_sync_libfuncs (UNITS_PER_WORD);
+}
+
 #include "gt-m68k.h"
-- 
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