hugetlbfs: common code update for s390

[linux-2.6-omap-h63xx.git] / include / asm-sparc64 / ptrace.h

diff --git a/include/asm-sparc64/ptrace.h b/include/asm-sparc64/ptrace.h
index 6da197803efcd501fbf81ab2ca0a59572b41fd9c..b4b951d570bbf3915fdf5ddad8624c95f70b453c 100644 (file)
--- a/include/asm-sparc64/ptrace.h
+++ b/include/asm-sparc64/ptrace.h
@@ -8,6 +8,8 @@
  * stack during a system call and basically all traps.
  */
 
+#define PT_REGS_MAGIC 0x57ac6c00
+
 #ifndef __ASSEMBLY__
 
 struct pt_regs {
@@ -16,7 +18,19 @@ struct pt_regs {
        unsigned long tpc;
        unsigned long tnpc;
        unsigned int y;
-       unsigned int fprs;
+
+       /* We encode a magic number, PT_REGS_MAGIC, along
+        * with the %tt (trap type) register value at trap
+        * entry time.  The magic number allows us to identify
+        * accurately a trap stack frame in the stack
+        * unwinder, and the %tt value allows us to test
+        * things like "in a system call" etc. for an arbitray
+        * process.
+        *
+        * The PT_REGS_MAGIC is choosen such that it can be
+        * loaded completely using just a sethi instruction.
+        */
+       unsigned int magic;
 };
 
 struct pt_regs32 {
@@ -147,7 +161,7 @@ extern void __show_regs(struct pt_regs *);
 #define PT_V9_TPC    0x88
 #define PT_V9_TNPC   0x90
 #define PT_V9_Y      0x98
-#define PT_V9_FPRS   0x9c
+#define PT_V9_MAGIC  0x9c
 #define PT_TSTATE      PT_V9_TSTATE
 #define PT_TPC         PT_V9_TPC
 #define PT_TNPC                PT_V9_TNPC