Update of /project/movitz/cvsroot/ia-x86 In directory common-lisp.net:/tmp/cvs-serv6929

Modified Files: README Log Message: *** empty log message *** Date: Sun Jan 30 06:54:33 2005 Author: ffjeld

Index: ia-x86/README diff -u ia-x86/README:1.2 ia-x86/README:1.3 --- ia-x86/README:1.2 Sun Jan 30 03:35:16 2005 +++ ia-x86/README Sun Jan 30 06:54:33 2005 @@ -10,7 +10,7 @@ ## Author: Frode Vatvedt Fjeld frodef@acm.org ## Created at: Sat Jan 29 16:48:42 2005 ## -## $Id: README,v 1.2 2005/01/30 11:35:16 ffjeld Exp $ +## $Id: README,v 1.3 2005/01/30 14:54:33 ffjeld Exp $ ## ######################################################################

@@ -67,6 +67,8 @@

This is a more-or-less exact description of the syntax:

+--------------------------------------------------------- + program ::= (<sexpr>*)

sexpr ::= ( <expr> ) | <label> | (% <inline-data> %) | (:include . <program>) @@ -96,5 +98,40 @@

prefix ::= <segment-override> | (:size <size>)

+--------------------------------------------------------- + + The function proglist-encode takes a proglist and produces -machine-code in the form of e.g. a vector of 8-bit bytes. +machine-code in the form of e.g. a vector of 8-bit bytes. A typical +usage would be this: + + (proglist-encode :octet-vector :16-bit #x7c00 + (read-proglist (mkasm16-bios-print))) + +The first agument, :octet-vector, requests that the result be in the +form of a vector of octets. The second argument says to prodce machine +code for the 16-bit mode of x86. Next is the address to assume the +code is located in memory (if the program is position-independent, +just pass zero). Finally, there is the proglist to be encoded to +machine code. Additionally, the keyword argument :symtab-lookup can +provide a function that proglist-encode will use to map (otherwise +undefined) labels to integers. The primary return value is the byte +vector, while the secondary return value is an (assoc) symbol-table: + + IA-X86(7): (proglist-encode :octet-vector :16-bit #x7c00 + (read-proglist (mkasm16-bios-print))) + => #(#xf #xb6 #xc #x46 #xb4 #xe #xbb #x7 #x0 #xac ...) + => ((PRINT-LOOP . #x7c09)) + + +Another operator that can be useful for interactive and experimental +use, is the macro "asm" which encodes a single instruction. This can +be used e.g. to verify syntax or the encoded size of an instruction: + + IA-X86(8): (asm :movl :eax (:ebx 1)) + => #c(#x894301 #x3) + +The return value is a complex, whose real component is the binary +encoding of the instruction, and the imaginary component is the number +of bytes. +