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[Qemu-devel] [PATCH] gdbstub: Implement Xfer:auxv:read


From: Bhushan Attarde
Subject: [Qemu-devel] [PATCH] gdbstub: Implement Xfer:auxv:read
Date: Wed, 1 Jul 2015 16:30:20 +0530

Implementation of "Xfer:auxv:read" to provide auxiliary vector information
to clients which relies on it.

For example: AT_ENTRY in auxiliary vector provides the entry point information.
Client can use this information to compare it with entry point mentioned in
executable to calculate load offset and then update the load addresses
accordingly.

Signed-off-by: Bhushan Attarde <address@hidden>
---
 gdbstub.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/gdbstub.c b/gdbstub.c
index cea2a84..bdcaa6b 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -1153,6 +1153,9 @@ static int gdb_handle_packet(GDBState *s, const char 
*line_buf)
             if (cc->gdb_core_xml_file != NULL) {
                 pstrcat(buf, sizeof(buf), ";qXfer:features:read+");
             }
+#ifdef CONFIG_USER_ONLY
+            pstrcat(buf, sizeof(buf), ";qXfer:auxv:read+");
+#endif
             put_packet(s, buf);
             break;
         }
@@ -1199,6 +1202,50 @@ static int gdb_handle_packet(GDBState *s, const char 
*line_buf)
             put_packet_binary(s, buf, len + 1);
             break;
         }
+#ifdef CONFIG_USER_ONLY
+        if (strncmp(p, "Xfer:auxv:read:", 15) == 0) {
+            TaskState *ts = s->c_cpu->opaque;
+            target_ulong auxv = ts->info->saved_auxv;
+            target_ulong auxv_len = ts->info->auxv_len;
+            char *ptr;
+
+            p += 15;
+            while (*p && *p != ':') {
+                p++;
+            }
+            p++;
+
+            addr = strtoul(p, (char **)&p, 16);
+            if (*p == ',') {
+                p++;
+            }
+            len = strtoul(p, (char **)&p, 16);
+
+            ptr = lock_user(VERIFY_READ, auxv, auxv_len, 0);
+            if (ptr == NULL) {
+                break;
+            }
+
+            if (addr > len) {
+                snprintf(buf, sizeof(buf), "E00");
+                put_packet(s, buf);
+                break;
+            }
+            if (len > (MAX_PACKET_LENGTH - 5) / 2) {
+                len = (MAX_PACKET_LENGTH - 5) / 2;
+            }
+            if (len < auxv_len - addr) {
+                buf[0] = 'm';
+                len = memtox(buf + 1, ptr + addr, len);
+            } else {
+                buf[0] = 'l';
+                len = memtox(buf + 1, ptr + addr, auxv_len - addr);
+            }
+            put_packet_binary(s, buf, len + 1);
+            unlock_user(ptr, auxv, len);
+            break;
+        }
+#endif /* !CONFIG_USER_ONLY */
         if (is_query_packet(p, "Attached", ':')) {
             put_packet(s, GDB_ATTACHED);
             break;
-- 
2.4.4




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