From d957532a87a1d41aed4f52836faf6539d3133840 Mon Sep 17 00:00:00 2001
From: Peter Wemm <peter@FreeBSD.org>
Date: Wed, 28 Jan 2004 23:54:31 +0000
Subject: [PATCH] Add dbreg struct definitions for /proc/*/dbregs and a place
 to store the registers in the pcb

---
 sys/amd64/include/pcb.h | 11 +++++++++--
 sys/amd64/include/reg.h | 15 ++++++++++++++-
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/sys/amd64/include/pcb.h b/sys/amd64/include/pcb.h
index 1d909cdf33e3..311c47326ce3 100644
--- a/sys/amd64/include/pcb.h
+++ b/sys/amd64/include/pcb.h
@@ -64,11 +64,18 @@ struct pcb {
 	u_int32_t	pcb_es;
 	u_int32_t	pcb_fs;
 	u_int32_t	pcb_gs;
+	u_int64_t	pcb_dr0;
+	u_int64_t	pcb_dr1;
+	u_int64_t	pcb_dr2;
+	u_int64_t	pcb_dr3;
+	u_int64_t	pcb_dr6;
+	u_int64_t	pcb_dr7;
 
 	struct	savefpu	pcb_save;
 	u_long	pcb_flags;
-#define	PCB_FPUINITDONE	0x01	/* fpu state is initialized */
-#define	PCB_FULLCTX	0x02	/* full context restore on sysret */
+#define	PCB_DBREGS	0x02	/* process using debug registers */
+#define	PCB_FPUINITDONE	0x08	/* fpu state is initialized */
+#define	PCB_FULLCTX	0x80	/* full context restore on sysret */
 
 	caddr_t	pcb_onfault;	/* copyin/out fault recovery */
 };
diff --git a/sys/amd64/include/reg.h b/sys/amd64/include/reg.h
index 73b52d7b1aa6..0bbf808c4ab2 100644
--- a/sys/amd64/include/reg.h
+++ b/sys/amd64/include/reg.h
@@ -84,10 +84,23 @@ struct fpreg {
 	unsigned long	fpr_spare[12];
 };
 
+/*
+ * Register set accessible via /proc/$pid/dbregs.
+ */
 struct dbreg {
-	unsigned long grrr;
+	unsigned long  dr[16];	/* debug registers */
+				/* Index 0-3: debug address registers */
+				/* Index 4-5: reserved */
+				/* Index 6: debug status */
+				/* Index 7: debug control */
+				/* Index 8-15: reserved */
 };
 
+#define DBREG_DR7_EXEC      0x00      /* break on execute       */
+#define DBREG_DR7_WRONLY    0x01      /* break on write         */
+#define DBREG_DR7_RDWR      0x03      /* break on read or write */
+#define DBREG_DRX(d,x) ((d)->dr[(x)]) /* reference dr0 - dr15 by
+                                         register number */
 #ifdef _KERNEL
 /*
  * XXX these interfaces are MI, so they should be declared in a MI place.