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authorDavid Howells <dhowells@redhat.com>2010-05-24 14:32:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-25 08:07:02 -0700
commit7ca8b9c0dafd1cb36289aa4c92c7beae7adcd34f (patch)
treea762d0b8bbb090b423eafae7f009839592e23290 /arch/frv/kernel
parentc6f6b596a5a73e63e5e930c414375c0c389199ab (diff)
downloadlinux-7ca8b9c0dafd1cb36289aa4c92c7beae7adcd34f.tar.gz
frv: extend gdbstub to support more features of gdb
Extend gdbstub to support more features of gdb remote protocol to keep gdb-7 and emacs gud mode happy: (*) The D command. Detach debugger. (*) The H command. Handle setting the target thread by ignoring it. (*) The qAttached command. Indicate we 'attached' to an existing process. (*) The qC command. Indicate that the current thread ID is 0. (*) The qOffsets command. Indicate that no relocation has been done. (*) The qSymbol:: command. Indicate that we're not interested in looking up any symbol addresses. (*) The qSupported command. Indicate the maximum packet size and the fact that reverse step and continue aren't supported. (*) The vCont? command. Indicate that we don't support any of its variants. Also make it possible to trace the commands and replies without tracing the individual character I/O. [akpm@linux-foundation.org: make gdbstub_handle_query() static] Signed-off-by: David Howells <dhowells@redhat.com> Cc: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/frv/kernel')
-rw-r--r--arch/frv/kernel/gdb-io.c4
-rw-r--r--arch/frv/kernel/gdb-stub.c61
2 files changed, 63 insertions, 2 deletions
diff --git a/arch/frv/kernel/gdb-io.c b/arch/frv/kernel/gdb-io.c
index c997bccb922..2ca641d199f 100644
--- a/arch/frv/kernel/gdb-io.c
+++ b/arch/frv/kernel/gdb-io.c
@@ -171,11 +171,11 @@ int gdbstub_rx_char(unsigned char *_ch, int nonblock)
return -EINTR;
}
else if (st & (UART_LSR_FE|UART_LSR_OE|UART_LSR_PE)) {
- gdbstub_proto("### GDB Rx Error (st=%02x) ###\n",st);
+ gdbstub_io("### GDB Rx Error (st=%02x) ###\n",st);
return -EIO;
}
else {
- gdbstub_proto("### GDB Rx %02x (st=%02x) ###\n",ch,st);
+ gdbstub_io("### GDB Rx %02x (st=%02x) ###\n",ch,st);
*_ch = ch & 0x7f;
return 0;
}
diff --git a/arch/frv/kernel/gdb-stub.c b/arch/frv/kernel/gdb-stub.c
index 7ca8a6b19ac..84d103c33c9 100644
--- a/arch/frv/kernel/gdb-stub.c
+++ b/arch/frv/kernel/gdb-stub.c
@@ -1344,6 +1344,44 @@ void gdbstub_get_mmu_state(void)
} /* end gdbstub_get_mmu_state() */
+/*
+ * handle general query commands of the form 'qXXXXX'
+ */
+static void gdbstub_handle_query(void)
+{
+ if (strcmp(input_buffer, "qAttached") == 0) {
+ /* return current thread ID */
+ sprintf(output_buffer, "1");
+ return;
+ }
+
+ if (strcmp(input_buffer, "qC") == 0) {
+ /* return current thread ID */
+ sprintf(output_buffer, "QC 0");
+ return;
+ }
+
+ if (strcmp(input_buffer, "qOffsets") == 0) {
+ /* return relocation offset of text and data segments */
+ sprintf(output_buffer, "Text=0;Data=0;Bss=0");
+ return;
+ }
+
+ if (strcmp(input_buffer, "qSymbol::") == 0) {
+ sprintf(output_buffer, "OK");
+ return;
+ }
+
+ if (strcmp(input_buffer, "qSupported") == 0) {
+ /* query of supported features */
+ sprintf(output_buffer, "PacketSize=%u;ReverseContinue-;ReverseStep-",
+ sizeof(input_buffer));
+ return;
+ }
+
+ gdbstub_strcpy(output_buffer,"E01");
+}
+
/*****************************************************************************/
/*
* handle event interception and GDB remote protocol processing
@@ -1840,6 +1878,10 @@ void gdbstub(int sigval)
case 'k' :
goto done; /* just continue */
+ /* detach */
+ case 'D':
+ gdbstub_strcpy(output_buffer, "OK");
+ break;
/* reset the whole machine (FIXME: system dependent) */
case 'r':
@@ -1852,6 +1894,14 @@ void gdbstub(int sigval)
__debug_status.dcr |= DCR_SE;
goto done;
+ /* extended command */
+ case 'v':
+ if (strcmp(input_buffer, "vCont?") == 0) {
+ output_buffer[0] = 0;
+ break;
+ }
+ goto unsupported_cmd;
+
/* set baud rate (bBB) */
case 'b':
ptr = &input_buffer[1];
@@ -1923,8 +1973,19 @@ void gdbstub(int sigval)
gdbstub_strcpy(output_buffer,"OK");
break;
+ /* Thread-setting packet */
+ case 'H':
+ gdbstub_strcpy(output_buffer, "OK");
+ break;
+
+ case 'q':
+ gdbstub_handle_query();
+ break;
+
default:
+ unsupported_cmd:
gdbstub_proto("### GDB Unsupported Cmd '%s'\n",input_buffer);
+ gdbstub_strcpy(output_buffer,"E01");
break;
}