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[Qemu-devel] [PATCH] gdbstub: Support AUXV packet for debugging PIE exec
From: |
Wei-cheng, Wang |
Subject: |
[Qemu-devel] [PATCH] gdbstub: Support AUXV packet for debugging PIE executables. |
Date: |
Sun, 23 Nov 2014 21:28:35 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
Hi,
This patch adds support for sending AUXV packet.
This is required for debugging Linux position independent executables.
Otherwise, gdb client cannot find out where the executable is loaded.
Signed-off-by: Wei-cheng, Wang <address@hidden>
---
gdbstub.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/gdbstub.c b/gdbstub.c
index d1b5afd..30f3bbc 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -1127,6 +1127,7 @@ 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+");
}
+ pstrcat(buf, sizeof(buf), ";qXfer:auxv:read+");
put_packet(s, buf);
break;
}
@@ -1173,6 +1174,46 @@ 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);
+ }
+#endif /* !CONFIG_USER_ONLY */
/* Unrecognised 'q' command. */
goto unknown_command;
--
1.9.1
- [Qemu-devel] [PATCH] gdbstub: Support AUXV packet for debugging PIE executables.,
Wei-cheng, Wang <=