[LV-kern-commit] CVS: kernel-2.4/Documentation/s390 Debugging390.txt,1.1,1.2

[Dave A. <ai...@us...>]

Update of /cvsroot/linux-vax/kernel-2.4/Documentation/s390
In directory sc8-pr-cvs1:/tmp/cvs-serv23180/Documentation/s390

Modified Files:
	Debugging390.txt 
Log Message:
DA: sync to Marcelo 2.4.18 + remove init_mmap (no longer needed)


Index: Debugging390.txt
===================================================================
RCS file: /cvsroot/linux-vax/kernel-2.4/Documentation/s390/Debugging390.txt,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- Debugging390.txt	9 Apr 2002 16:55:46 -0000	1.1
+++ Debugging390.txt	10 Jun 2003 01:45:46 -0000	1.2
@@ -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
 ---------------------------------------------