From 1ae4d7da861daae89e2ae86e76550cf4cdda8ef7 Mon Sep 17 00:00:00 2001
From: rvb <rvb@NetBSD.org>
Date: Thu, 13 Aug 1998 17:54:15 +0000
Subject: [PATCH] Allow inb/outb and friends to be called from debugger. Crude
 access to x86 hdw "debug" registers.

---
 sys/arch/i386/i386/db_dbgreg.s | 189 +++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 sys/arch/i386/i386/db_dbgreg.s

diff --git a/sys/arch/i386/i386/db_dbgreg.s b/sys/arch/i386/i386/db_dbgreg.s
new file mode 100644
index 000000000000..1a953bfe9e1d
--- /dev/null
+++ b/sys/arch/i386/i386/db_dbgreg.s
@@ -0,0 +1,189 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1995 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+
+#include <i386/include/asm.h>
+#define S_ARG0	 4(%esp)
+#define S_ARG1	 8(%esp)
+#define S_ARG2	12(%esp)
+#define S_ARG3	16(%esp)
+
+#define B_ARG0	 8(%ebp)
+#define B_ARG1	12(%ebp)
+#define B_ARG2	16(%ebp)
+#define B_ARG3	20(%ebp)
+
+/*
+ * void outb(unsigned char *io_port,
+ *	     unsigned char byte)
+ *
+ * Output a byte to an IO port.
+ */
+ENTRY(outb)
+	movl	S_ARG0,%edx		/* IO port address */
+	movl	S_ARG1,%eax		/* data to output */
+	outb	%al,%dx			/* send it out */
+	ret
+
+/*
+ * unsigned char inb(unsigned char *io_port)
+ *
+ * Input a byte from an IO port.
+ */
+ENTRY(inb)
+	movl	S_ARG0,%edx		/* IO port address */
+	xor	%eax,%eax		/* clear high bits of register */
+	inb	%dx,%al			/* get the byte */
+	ret
+
+/*
+ * void outw(unsigned short *io_port,
+ *	     unsigned short word)
+ *
+ * Output a word to an IO port.
+ */
+ENTRY(outw)
+	movl	S_ARG0,%edx		/* IO port address */
+	movl	S_ARG1,%eax		/* data to output */
+	outw	%ax,%dx			/* send it out */
+	ret
+
+/*
+ * unsigned short inw(unsigned short *io_port)
+ *
+ * Input a word from an IO port.
+ */
+ENTRY(inw)
+	movl	S_ARG0,%edx		/* IO port address */
+	xor	%eax,%eax		/* clear high bits of register */
+	inw	%dx,%ax			/* get the word */
+	ret
+
+/*
+ * void outl(unsigned int *io_port,
+ *	     unsigned int byte)
+ *
+ * Output an int to an IO port.
+ */
+ENTRY(outl)
+	movl	S_ARG0,%edx		/* IO port address */
+	movl	S_ARG1,%eax		/* data to output */
+	outl	%eax,%dx		/* send it out */
+	ret
+
+/*
+ * unsigned int inl(unsigned int *io_port)
+ *
+ * Input an int from an IO port.
+ */
+ENTRY(inl)
+	movl	S_ARG0,%edx		/* IO port address */
+	inl	%dx,%eax		/* get the int */
+	ret
+
+
+ENTRY(dr6)
+	movl	%db6, %eax
+	ret
+
+/*	dr<i>(address, type, len, persistence)
+ *	type:
+ *	   00	execution (use len 00)
+ *	   01	data write
+ *	   11	data read/write
+ *	len:
+ *	   00	one byte
+ *	   01	two bytes
+ *	   11	four bytes
+ */
+ENTRY(dr0)
+	movl	S_ARG0, %eax
+	movl	%eax,_dr_addr
+	movl	%eax, %db0
+	movl	$0, %ecx
+	jmp	0f
+ENTRY(dr1)
+	movl	S_ARG0, %eax
+	movl	%eax,_dr_addr+1*4
+	movl	%eax, %db1
+	movl	$2, %ecx
+	jmp	0f
+ENTRY(dr2)
+	movl	S_ARG0, %eax
+	movl	%eax,_dr_addr+2*4
+	movl	%eax, %db2
+	movl	$4, %ecx
+	jmp	0f
+
+ENTRY(dr3)
+	movl	S_ARG0, %eax
+	movl	%eax,_dr_addr+3*4
+	movl	%eax, %db3
+	movl	$6, %ecx
+
+0:
+	pushl	%ebp
+	movl	%esp, %ebp
+
+	movl	%db7, %edx
+	movl	%edx,_dr_addr+4*4
+	andl	dr_msk(,%ecx,2),%edx	/* clear out new entry */
+	movl	%edx,_dr_addr+5*4
+	movzbl	B_ARG3, %eax
+	andb	$3, %al
+	shll	%cl, %eax
+	orl	%eax, %edx
+
+	movzbl	B_ARG1, %eax
+	andb	$3, %al
+	addb	$0x10, %ecx
+	shll	%cl, %eax
+	orl	%eax, %edx
+
+	movzbl	B_ARG2, %eax
+	andb	$3, %al
+	addb	$0x2, %ecx
+	shll	%cl, %eax
+	orl	%eax, %edx
+
+	movl	%edx, %db7
+	movl	%edx,_dr_addr+7*4
+	movl	%edx, %eax
+	leave
+	ret
+
+	.data
+dr_msk:
+	.long	~0x000f0003
+	.long	~0x00f0000c
+	.long	~0x0f000030
+	.long	~0xf00000c0
+ENTRY(dr_addr)
+	.long	0,0,0,0
+	.long	0,0,0,0
+	.text
+
+