patch-2.4.18 linux/Documentation/s390/Debugging390.txt

• Lines: 27
• Date: Fri Dec 21 16:25:30 2001
• Orig file: linux.orig/Documentation/s390/Debugging390.txt
• Orig date: Mon Feb 18 20:18:39 2002

diff -Naur -X /home/marcelo/lib/dontdiff linux.orig/Documentation/s390/Debugging390.txt linux/Documentation/s390/Debugging390.txt
@@ -237,9 +237,10 @@
 
 
 On 390 our limitations & strengths make us slightly different.
-For backward compatibility we are only allowed use 31 bits (2GB)
-of our 32 bit addresses,however, we use entirely separate address 
-spaces for the user & kernel.
+For backward compatibility ( because of the psw address hi bit which
+indicates whether we are in 31 or 64 bit mode ) we are only allowed 
+use 31 bits (2GB) of our 32 bit addresses. However, 
+we use entirely separate address  spaces for the user & kernel.
 
 This means we can support 2GB of non Extended RAM on s/390, & more
 with the Extended memory managment swap device & 
@@ -2123,6 +2124,12 @@
 now do
 p/x (*(**$sp+56))&0x7fffffff
 & so on.
+
+Another good trick to look at addresses on the stack if you've somehow lost 
+the backchain is.
+x/500xa $sp
+This displays anything the name of any known functions above the stack pointer
+for 500 bytes.
 
 Disassembling instructions without debug info
 ---------------------------------------------