Alexandre Oliva writes:

This patch adds code to uClibc to support a new ABI designed for the
FR-V architecture, that enables text segments of executables and
shared libraries to be shared by multiple processes on an OS such as
uClinux, that can run on FR-V processors without an MMU.

Patches for binutils and GCC have just been posted in the
corresponding mailing lists.  The binutils patch was approved,
but there's one additional patch pending review, that I posted
this week.  An updated GCC patch will be posted to
gcc-patches@gcc.gnu.org as soon as I complete testing (I used a
known-good compiler to test the uClibc patch below).

Since the existing dynamic loader code didn't support independent
relocation of segments, it required changes that were somewhat
extensive.  I've added a number of new machine-specific macros to try
to keep the platform and ABI-specific details outside the generic
code.  I hope this is not a problem.

1 files changed, 53 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/frv/bits/setjmp.h b/libc/sysdeps/linux/frv/bits/setjmp.h
new file mode 100644
index 000000000..5c20c4f54
--- /dev/null
+++ b/libc/sysdeps/linux/frv/bits/setjmp.h
@@ -0,0 +1,53 @@
+/* Copyright (C) 1999, 2000, 2003, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* Define the machine-dependent type `jmp_buf'.  FRV version. */
+
+#ifndef _SETJMP_H
+# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
+#endif
+
+#define	__SETJMP_NUM_INT	32		/* number of integer registers to save */
+#define	__SETJMP_NUM_DBL	32		/* number of double registers to save */
+
+#define	__SETJMP_INT(x)	(x)
+#define	__SETJMP_DBL(x)	(__SETJMP_NUM_INT+(x))
+#define	__SETJMP_LR	(__SETJMP_NUM_INT+__SETJMP_NUM_DBL)
+#define __SETJMP_SP	(__SETJMP_LR+1)
+#define __SETJMP_FP	(__SETJMP_SP+1)
+
+
+#ifndef _ASM
+typedef struct
+/* Demand 64-bit alignment such that we can use std/ldd in
+   setjmp/longjmp.  */
+__attribute__((__aligned__(8)))
+  {
+    /* Callee-saved registers.  */
+    unsigned long __ints[__SETJMP_NUM_INT];	/* integer registers */
+    unsigned long __dbls[__SETJMP_NUM_DBL];	/* double registers */
+    unsigned long __lr;				/* linkage register */
+    unsigned long __sp;				/* stack pointer */
+    unsigned long __fp;				/* frame pointer */
+  } __jmp_buf[1];
+#endif
+
+/* Test if longjmp to JMPBUF would unwind the frame
+   containing a local variable at ADDRESS.  */
+#define _JMPBUF_UNWINDS(jmpbuf, address) \
+  ((unsigned long) (address) < (jmpbuf)->__sp)