From 0b96b98294901442de8196e21fff7c5fd79750ef Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@gnupg.org>
Date: Sat, 12 Aug 2017 13:29:56 +0200
Subject: ddb: Add magic variable $mapXX.

Maps '$mapXX' to a VM map structure address.  @var{xx} is a task
identification number printed by a @code{show all tasks} command.

* ddb/db_task_thread.c (db_get_map): New function.
* ddb/db_task_thread.h (db_get_map): New declaration.
* ddb/db_variables.c (db_vars): Add new variable.
* doc/mach.texi: Document this.
---
 ddb/db_task_thread.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'ddb/db_task_thread.c')

diff --git a/ddb/db_task_thread.c b/ddb/db_task_thread.c
index 7927e674..f7fbb805 100644
--- a/ddb/db_task_thread.c
+++ b/ddb/db_task_thread.c
@@ -303,4 +303,29 @@ db_get_task_thread(
 	return;
 }
 
+/*
+ * convert $mapXXX type DDB variable to map address
+ */
+void
+db_get_map(struct db_variable *vp,
+	   db_expr_t *valuep,
+	   int flag,
+	   db_var_aux_param_t ap)
+{
+  task_t task;
+
+  if (flag != DB_VAR_GET) {
+    db_error("Cannot set to $map variable\n");
+    /* NOTREACHED */
+  }
+
+  if ((task = db_lookup_task_id(ap->suffix[0])) == TASK_NULL) {
+    db_printf("no such map($map%d)\n", ap->suffix[0]);
+    db_error(0);
+    /* NOTREACHED */
+  }
+
+  *valuep = (db_expr_t) task->map;
+}
+
 #endif /* MACH_KDB */
-- 
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