diff options
| -rw-r--r-- | x86_64/debug_trace.S | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/x86_64/debug_trace.S b/x86_64/debug_trace.S new file mode 100644 index 00000000..7bed5ccc --- /dev/null +++ b/x86_64/debug_trace.S @@ -0,0 +1,56 @@ +/* + * Copyright (c) 1994 The University of Utah and + * the Computer Systems Laboratory at the University of Utah (CSL). + * All rights reserved. + * + * Permission to use, copy, modify and distribute this software is hereby + * granted provided that (1) source code retains these copyright, permission, + * and disclaimer notices, and (2) redistributions including binaries + * reproduce the notices in supporting documentation, and (3) all advertising + * materials mentioning features or use of this software display the following + * acknowledgement: ``This product includes software developed by the + * Computer Systems Laboratory at the University of Utah.'' + * + * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS + * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF + * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * CSL requests users of this software to return to csl-dist@cs.utah.edu any + * improvements that they make and grant CSL redistribution rights. + * + * Author: Bryan Ford, University of Utah CSL + */ + +#ifdef DEBUG + +#include <mach/machine/asm.h> +#include <i386/xen.h> + +#include "debug.h" + + .text +ENTRY(_debug_trace) + pushf + cli + pushq %rax + pushq %rbx + .byte 0x36 /* SS: bug in gas? */ + movl %ss:EXT(debug_trace_pos),%eax + movq S_ARG0,%rbx + movq %rbx,%ss:EXT(debug_trace_buf)(,%eax,16) + movl S_ARG1,%ebx + movl %ebx,%ss:EXT(debug_trace_buf)+8(,%eax,16) + incl %eax + andl $DEBUG_TRACE_LEN-1,%eax + .byte 0x36 /* SS: bug in gas? */ + movl %eax,%ss:EXT(debug_trace_pos) + popq %rbx + popq %rax + popf + ret + +#endif /* DEBUG */ + +/* XXX gas bug? need at least one symbol... */ +foo: + |