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authorLiviu Ionescu <ilg@livius.net>2014-12-11 12:07:48 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-12-11 12:07:48 +0000
commita38bb0792ca8b4082d81884a6cb25fa0d334b4a6 (patch)
tree4f3e97c0503eff2d0dee171572d657b2da26b5eb /gdbstub.c
parent1ecc3a2df168034b8ab33ff5ba6434ce3593dbb5 (diff)
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Add the "-semihosting-config" option.
The usual semihosting behaviour is to process the system calls locally and return; unfortuantelly the initial implementation dinamically changed the target to GDB during debug sessions, which, for the usual arm-none-eabi-gdb, is not implemented. The result was that during debug sessions the semihosting calls were discarded. This patch adds a configuration variable and an option to set it on the command line: -semihosting-config [enable=on|off,]target=native|gdb|auto This option enables semihosting and defines where the semihosting calls will be addressed, to QEMU ('native') or to GDB ('gdb'). The default is auto, which means 'gdb' during debug sessions and 'native' otherwise. Signed-off-by: Liviu Ionescu <ilg@livius.net> Message-id: 1416341957-9796-1-git-send-email-ilg@livius.net [PMM: moved declaration and definition of semihosting_target to gdbstub.h and gdbstub.c to fix build failure on linux-user] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'gdbstub.c')
-rw-r--r--gdbstub.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/gdbstub.c b/gdbstub.c
index 0faca56..e4a1a79 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -317,6 +317,8 @@ static GDBState *gdbserver_state;
bool gdb_has_xml;
+int semihosting_target = SEMIHOSTING_TARGET_AUTO;
+
#ifdef CONFIG_USER_ONLY
/* XXX: This is not thread safe. Do we care? */
static int gdbserver_fd = -1;
@@ -351,10 +353,19 @@ static enum {
GDB_SYS_DISABLED,
} gdb_syscall_mode;
-/* If gdb is connected when the first semihosting syscall occurs then use
- remote gdb syscalls. Otherwise use native file IO. */
+/* Decide if either remote gdb syscalls or native file IO should be used. */
int use_gdb_syscalls(void)
{
+ if (semihosting_target == SEMIHOSTING_TARGET_NATIVE) {
+ /* -semihosting-config target=native */
+ return false;
+ } else if (semihosting_target == SEMIHOSTING_TARGET_GDB) {
+ /* -semihosting-config target=gdb */
+ return true;
+ }
+
+ /* -semihosting-config target=auto */
+ /* On the first call check if gdb is connected and remember. */
if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED
: GDB_SYS_DISABLED);