Improvements from Bruce Evans

2 files changed, 29 insertions, 17 deletions

diff --git a/sys/amd64/amd64/amd64-gdbstub.c b/sys/amd64/amd64/amd64-gdbstub.c
index 41b72af..7ac17a0 100644
--- a/sys/amd64/amd64/amd64-gdbstub.c
+++ b/sys/amd64/amd64/amd64-gdbstub.c
@@ -90,23 +90,20 @@
  *
  ****************************************************************************/
 
-#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+
+#include <machine/cons.h>
+
+#include <ddb/ddb.h>
+
 #include <setjmp.h>
-#include <stdio.h>
-#include <string.h>
-#include <machine/db_machdep.h>
-#include <machine/trap.h>
-#include <machine/psl.h>
 
 /************************************************************************/
 
 void		gdb_handle_exception (db_regs_t *, int, int);
 
 extern jmp_buf	db_jmpbuf;
-extern void	db_read_bytes (vm_offset_t addr, int size, char *data);
-extern void	db_write_bytes (vm_offset_t addr, int size, char *data);
-extern void	siocnputc (dev_t, int c);
-extern int	siocngetc (dev_t);
 
 /************************************************************************/
 /* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/
@@ -116,6 +113,10 @@ extern int	siocngetc (dev_t);
 /* Create private copies of common functions used by the stub.  This prevents
    nasty interactions between app code and the stub (for instance if user steps
    into strlen, etc..) */
+/* XXX this is fairly bogus.  strlen() and strcpy() should be reentrant,
+   and are reentrant under FreeBSD.  In any case, our versions should not
+   be named the same as the standard versions, so that the address `strlen'
+   is unambiguous...  */
 
 static int
 strlen (const char *s)
@@ -137,17 +138,20 @@ strcpy (char *dst, const char *src)
   return retval;
 }
 
+/* XXX sio always uses its major with minor 0 no matter what we specify.  */
+#define	REMOTE_DEV	0
+
 static int
 putDebugChar (int c)		/* write a single character      */
 {
-  siocnputc (NULL, c);
+  siocnputc (REMOTE_DEV, c);
   return 1;
 }
 
 static int
 getDebugChar (void)		/* read and return a single char */
 {
-  return siocngetc (NULL);
+  return siocngetc (REMOTE_DEV);
 }
 
 static const char hexchars[]="0123456789abcdef";
diff --git a/sys/amd64/amd64/db_interface.c b/sys/amd64/amd64/db_interface.c
index 284d2e9..7055d28 100644
--- a/sys/amd64/amd64/db_interface.c
+++ b/sys/amd64/amd64/db_interface.c
@@ -23,7 +23,7 @@
  * any improvements or extensions that they make and grant Carnegie the
  * rights to redistribute these changes.
  *
- *	$Id: db_interface.c,v 1.20 1996/08/27 19:45:56 pst Exp $
+ *	$Id: db_interface.c,v 1.21 1996/08/28 17:49:33 pst Exp $
  */
 
 /*
@@ -90,7 +90,15 @@ kdb_trap(type, code, regs)
 		break;
 
 	    default:
-		db_printf("kernel: type %d trap, code=%x\n", type, code);
+		/*
+		 * XXX this is almost useless now.  In most cases,
+		 * trap_fatal() has already printed a much more verbose
+		 * message.  However, it is dangerous to print things in
+		 * trap_fatal() - printf() might be reentered and trap.
+		 * The debugger should be given control first.
+		 */
+		if (ddb_mode)
+		    db_printf("kernel: type %d trap, code=%x\n", type, code);
 
 		if (db_nofault) {
 		    jmp_buf *no_fault = db_nofault;
@@ -105,7 +113,7 @@ kdb_trap(type, code, regs)
 	ddb_regs = *regs;
 
 	/*
-	 * Kernel mode - esp and ss not saved, so dummy them up
+	 * If in kernel mode, esp and ss are not saved, so dummy them up.
 	 */
 	if (ISPL(regs->tf_cs) == 0) {
 	    ddb_regs.tf_esp = (int)&regs->tf_esp;
@@ -129,7 +137,7 @@ kdb_trap(type, code, regs)
 	regs->tf_ebx    = ddb_regs.tf_ebx;
 
 	/*
-	 * If in user mode, the saved ESP and SS were valid, restore them
+	 * If in user mode, the saved ESP and SS were valid, restore them.
 	 */
 	if (ISPL(regs->tf_cs)) {
 	    regs->tf_esp = ddb_regs.tf_esp;
@@ -192,7 +200,7 @@ db_write_bytes(addr, size, data)
 
 	    addr1 = trunc_page(addr + size - 1);
 
-	    /* data crosses a page boundary */
+	    /* Map another page if the data crosses a page boundary. */
 	    if (trunc_page(addr) != addr1) {
 		ptep1 = pmap_pte(kernel_pmap, addr1);
 		oldmap1 = *ptep1;