Changes between Version 1 and Version 2 of ArmPortingNotes

Timestamp:

04/03/08 03:39:09 (5 years ago)

Author:

gb

Comment:

--

ArmPortingNotes

@@ -10 +10 @@
 
 ARM instructions are generally 32 bits wide; many ARM variants offer an alternate 16-bit instruction set ("THUMB") that offers improved code density, generally at the cost of dropping some ARM features (conditional execution, pre-shifted operands) and making it a bit awkward to access all 16 GPRs.
-(There's also something in newer ARMs which allows a mixture of 32/16 bit THUMB instructions.)  We might be able to use THUMB-encoding in some very specialized cases, but it's not clear how attractive this is.)
+(There's also something in newer ARMs which allows a mixture of 32/16 bit THUMB instructions.)  We might be able to use THUMB-encoding in some very specialized cases, but it's not clear how attractive this is.
 
 == Alignment ==
@@ -70 +70 @@
 @back
     (sub fn pc whatever) ; FN = pc - offset of this instruction
-}}]
+}}}
 
 === Call without "fn" register example ===
@@ -114 +114 @@
   (add pc nil disp) ; assuming that "disp" is an appropriate ARM constant.
 @back
-}}
+}}}
 
 or
@@ -147 +147 @@
 Exception handling seems to work (at least under Linux.)  The iPhone SDK headers show that the Apple ARM-based systems are Mach-based, and I assume that that means that exception handling needs to be done at the Mach level on those systems.
 
-
-I