[PATCH]: grub: Fix sparc64 setjmp implementation, update grub_setjmp() attributes.

[David Miller <davem@davemloft.net>]

The FSF has received my copyright assignment paperwork so I'm starting
to feed fresh copies of my sparc64 changes.

Here, we fix the setjmp assembler implementation for sparc64 and also
we fix all of the grub_setjmp declarations to have the proper
"returns_twice" attribute.

For normal "setjmp" GCC recognizes this special function name and
internally adds the attribute.  Amongst other things this makes sure
GCC does not emit a tail-call in functions that call grub_setjmp().
Since we use a special name for setjmp in GRUB we need to explicitly
add the attribute.

Without this fix, GCC on sparc64 really did emit a tail-call in the
nomal module where grub_setjmp() is called, and this led to myserious
crashes :-)

2009-03-25  David S. Miller  <davem@davemloft.net>

	* normal/sparc64/setjmp.S: Fix setjmp implementation.
	* include/grub/sparc64/setjmp.h (grub_jmp_buf): Update.
	(grub_setjmp): Mark with 'returns_twice' attribute.
	* include/grub/i386/setjmp.h (grub_setjmp): Likewise
	* include/grub/powerpc/setjmp.h (grub_setjmp): Likewise.
	* include/grub/x86_64/setjmp.h (grub_setjmp): Likewise.
---
 include/grub/i386/setjmp.h    |    5 +++--
 include/grub/powerpc/setjmp.h |    4 ++--
 include/grub/sparc64/setjmp.h |    9 +++++----
 include/grub/x86_64/setjmp.h  |    4 ++--
 normal/sparc64/setjmp.S       |   21 +++++++++++++++------
 5 files changed, 27 insertions(+), 16 deletions(-)

diff --git a/include/grub/i386/setjmp.h b/include/grub/i386/setjmp.h
index 02b0d8f..c5f94b4 100644
--- a/include/grub/i386/setjmp.h
+++ b/include/grub/i386/setjmp.h
@@ -1,6 +1,6 @@
 /*
  *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 2003,2006,2007  Free Software Foundation, Inc.
+ *  Copyright (C) 2003,2006,2007,2009  Free Software Foundation, Inc.
  *
  *  GRUB is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -21,7 +21,8 @@
 
 typedef unsigned long grub_jmp_buf[6];
 
-int grub_setjmp (grub_jmp_buf env) __attribute__ ((cdecl, regparm (3)));
+int grub_setjmp (grub_jmp_buf env) __attribute__ ((returns_twice, cdecl,
+						   regparm (3)));
 void grub_longjmp (grub_jmp_buf env, int val) __attribute__ ((noreturn, cdecl,
 							      regparm (3)));
 
diff --git a/include/grub/powerpc/setjmp.h b/include/grub/powerpc/setjmp.h
index 441e538..fa16f73 100644
--- a/include/grub/powerpc/setjmp.h
+++ b/include/grub/powerpc/setjmp.h
@@ -1,6 +1,6 @@
 /*
  *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 2002,2004,2006,2007  Free Software Foundation, Inc.
+ *  Copyright (C) 2002,2004,2006,2007,2009  Free Software Foundation, Inc.
  *
  *  GRUB is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -21,7 +21,7 @@
 
 typedef unsigned long grub_jmp_buf[20];
 
-int grub_setjmp (grub_jmp_buf env);
+int grub_setjmp (grub_jmp_buf env) __attribute__ ((returns_twice));
 void grub_longjmp (grub_jmp_buf env, int val) __attribute__ ((noreturn));
 
 #endif /* ! GRUB_SETJMP_CPU_HEADER */
diff --git a/include/grub/sparc64/setjmp.h b/include/grub/sparc64/setjmp.h
index 12d8e01..6096bae 100644
--- a/include/grub/sparc64/setjmp.h
+++ b/include/grub/sparc64/setjmp.h
@@ -1,6 +1,6 @@
 /*
  *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 2002,2004,2006,2007  Free Software Foundation, Inc.
+ *  Copyright (C) 2002,2004,2006,2007,2009  Free Software Foundation, Inc.
  *
  *  GRUB is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -19,10 +19,11 @@
 #ifndef GRUB_SETJMP_CPU_HEADER
 #define GRUB_SETJMP_CPU_HEADER	1
 
-/* FIXME (sparc64).  */
-typedef unsigned long grub_jmp_buf[20];
+#include <grub/types.h>
 
-int grub_setjmp (grub_jmp_buf env);
+typedef grub_uint64_t grub_jmp_buf[3];
+
+int grub_setjmp (grub_jmp_buf env) __attribute__ ((returns_twice));
 void grub_longjmp (grub_jmp_buf env, int val) __attribute__ ((noreturn));
 
 #endif /* ! GRUB_SETJMP_CPU_HEADER */
diff --git a/include/grub/x86_64/setjmp.h b/include/grub/x86_64/setjmp.h
index e417f65..4ad968e 100644
--- a/include/grub/x86_64/setjmp.h
+++ b/include/grub/x86_64/setjmp.h
@@ -1,6 +1,6 @@
 /*
  *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 2003,2006,2007  Free Software Foundation, Inc.
+ *  Copyright (C) 2003,2006,2007,2009  Free Software Foundation, Inc.
  *
  *  GRUB is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -21,7 +21,7 @@
 
 typedef unsigned long grub_jmp_buf[8];
 
-int grub_setjmp (grub_jmp_buf env);
+int grub_setjmp (grub_jmp_buf env) __attribute__ ((returns_twice));
 void grub_longjmp (grub_jmp_buf env, int val) __attribute__ ((noreturn));
 
 #endif /* ! GRUB_SETJMP_CPU_HEADER */
diff --git a/normal/sparc64/setjmp.S b/normal/sparc64/setjmp.S
index b1a9b6e..0e23ecf 100644
--- a/normal/sparc64/setjmp.S
+++ b/normal/sparc64/setjmp.S
@@ -1,6 +1,6 @@
 /*
  *  GRUB  --  GRand Unified Bootloader
- *  Copyright (C) 2005,2007  Free Software Foundation, Inc.
+ *  Copyright (C) 2005,2007,2009  Free Software Foundation, Inc.
  *
  *  GRUB is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -26,13 +26,22 @@
  * int grub_setjmp (grub_jmp_buf env)
  */
 FUNCTION(grub_setjmp)
-        ret
-         nop
+	stx	%o7, [%o0 + 0x00]
+	stx	%sp, [%o0 + 0x08]
+	stx	%fp, [%o0 + 0x10]
+	retl
+	 clr	%o0
 
 /*
  * int grub_longjmp (grub_jmp_buf env, int val)
  */
 FUNCTION(grub_longjmp)
-        ret
-         nop
-
+	ldx	[%o0 + 0x10], %g1
+	movrz	%o1, 1, %o1
+	flushw
+	ldx	[%o0 + 0x00], %o7
+	ldx	[%o0 + 0x08], %fp
+	sub	%fp, 192, %sp
+	stx	%g1, [%sp + 2047 + (14 * 8)]
+	retl
+	 restore %o1, 0, %o0
-- 
1.6.2.1.222.g570cc