Richard Sandiford writes: add support for init/fini arrays in shared flat libraries

1 files changed, 64 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/m68k/m68k_pic.S b/libc/sysdeps/linux/m68k/m68k_pic.S
new file mode 100644
index 000000000..e01e33b83
--- /dev/null
+++ b/libc/sysdeps/linux/m68k/m68k_pic.S
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2006 CodeSourcery Inc
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ *
+ * This file defines some m68k assembly macros for handling the differences
+ * between PIC and non-PIC.
+ */
+#include <features.h>
+
+	/* When assembling code for shared flat libraries, this is nonzero
+	 * if %a5 points the current library's GOT.  */
+	.equ	have_current_got, 0
+
+	/* Perform the equivalent of "<op> <target>", where <target> is
+	 * a text address.  <tmp> is available as a temporary address
+	 * register.  */
+	.macro	DO_TEXT op,target,tmp
+#if defined __HAVE_SHARED_FLAT__
+	.ifne	have_current_got
+	move.l \target@GOT(%a5),\tmp
+	.else
+	move.l _current_shared_library_a5_offset_(%a5),\tmp
+	move.l \target@GOT(\tmp),\tmp
+	.endif
+	\op (\tmp)
+#elif defined __PIC__
+	lea \target-.-8,\tmp
+	\op (%pc,\tmp)
+#else
+	\op \target
+#endif
+	.endm
+
+	/* Do "pea <target>" when <target> is a text address.
+	 * <tmp> is available as a temporary register.  */
+	.macro PEA_TEXT target,tmp
+	DO_TEXT pea,\target,\tmp
+	.endm
+
+	/* Likewise jsr.  */
+	.macro CALL target,tmp
+	DO_TEXT jsr,\target,\tmp
+	.endm
+
+	/* Likewise jmp.  */
+	.macro JUMP target,tmp
+	DO_TEXT jmp,\target,\tmp
+	.endm
+
+	/* Initialize the global pointer, if functions need to do that.  */
+	.macro INIT_GP
+#if defined __HAVE_SHARED_FLAT__
+	move.l	%a5,-(%sp)
+	move.l _current_shared_library_a5_offset_(%a5),%a5
+#endif
+	.endm
+
+	/* Undo the effects of INIT_GP.  */
+	.macro FINI_GP
+#if defined __HAVE_SHARED_FLAT__
+	move.l	(%sp)+,%a5
+#endif
+	.endm