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authorJoel Sherrill <joel.sherrill@OARcorp.com>1998-12-03 23:54:14 +0000
committerJoel Sherrill <joel.sherrill@OARcorp.com>1998-12-03 23:54:14 +0000
commit4721cf1ecb949b37c98b6fce79163541711de2e5 (patch)
treea89f2bef604b2ddf22b262fe6115d9f75c952781 /c/src/librdbg/src/i386/excep.c
parentRemoved spaces. (diff)
downloadrtems-4721cf1ecb949b37c98b6fce79163541711de2e5.tar.bz2
Patch from Emmanuel Raguet <raguet@crf.canon.fr> to add remote debug server
and RPC support to RTEMS. Thanks. :) Email follows: Hello, For Xmas, here is the Remote Debugger on RTEMS ! Here are 2 patches for the Remote Debugger on RTEMS for pc386 from Linux host : - one for RTEMS it self, - one for GDB-4.17. 1/ RTEMS patch -------------- This patch adds 2 libraries : - a simplified SUN RPC library - the Remote Debugger library The configuration command is the following : ../rtems4/configure --target=i386-rtemself --enable-rtemsbsp=pc386 --enable-rdbg The SUN RPC library is built only if networking is set. The RDBG library is built if networking and enable-rdbg are set. The function used to initialize the debugger is : rtems_rdbg_initialize (); A special function has been created to force a task to be in a "debug" state : enterRdbg(). The use of this function is not mandatory. 2/ GDB-4.17 patch ----------------- This patch create a new RTEMS target for GDB-4.17. The configuration command is the following : ./configure --enable-shared --target=i386RTEMS To connect to a target, use : target rtems [your_site_address] Then, attach the target using : attach 1 And... Debug ;) You can obtain the original GDB-4.17 on ftp://ftp.debian.org/debian/dists/stable/main/source/devel/gdb_4.17.orig.tar.gz This has been tested from a Debian 2.0.1 linux host.
Diffstat (limited to 'c/src/librdbg/src/i386/excep.c')
-rw-r--r--c/src/librdbg/src/i386/excep.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/c/src/librdbg/src/i386/excep.c b/c/src/librdbg/src/i386/excep.c
new file mode 100644
index 0000000000..5ca1fd8df6
--- /dev/null
+++ b/c/src/librdbg/src/i386/excep.c
@@ -0,0 +1,233 @@
+/*
+ **************************************************************************
+ *
+ * Component =
+ *
+ * Synopsis = rdbg/i386/excep.c
+ *
+ **************************************************************************
+ */
+
+#include <rtems.h>
+#include <rtems/error.h>
+#include <rdbg/rdbg_f.h>
+#include <assert.h>
+#include <errno.h>
+#include <rdbg/rdbg.h>
+#include <rdbg/servrpc.h>
+
+
+extern rtems_id serializeSemId;
+extern rtems_id wakeupEventSemId;
+
+
+unsigned int NbExceptCtx;
+volatile unsigned int NbSerializedCtx;
+Exception_context *FirstCtx = NULL;
+Exception_context *LastCtx = NULL;
+
+CPU_Exception_frame SavedContext;
+
+
+/********* Save an exception context at the end of a list *****/
+
+int PushExceptCtx ( Objects_Id Id, Objects_Id semId, CPU_Exception_frame *ctx ) {
+
+ Exception_context *SaveCtx;
+
+ SaveCtx = (Exception_context *)malloc(sizeof(Exception_context));
+ if (SaveCtx == NULL)
+ rtems_panic("Can't allocate memory to save Exception context");
+
+ SaveCtx->id = Id;
+ SaveCtx->ctx = ctx;
+ SaveCtx->semaphoreId = semId;
+ SaveCtx->previous = NULL;
+ SaveCtx->next = NULL;
+
+ if (FirstCtx == NULL){ /* initialization */
+ FirstCtx = SaveCtx;
+ LastCtx = SaveCtx;
+ NbExceptCtx = 1;
+ }
+ else {
+ NbExceptCtx ++;
+ LastCtx->next = SaveCtx;
+ SaveCtx->previous = LastCtx;
+ LastCtx = SaveCtx;
+ }
+ return 0;
+}
+
+/********* Save an temporary exception context in a ******/
+/********* global variable ******/
+
+int PushSavedExceptCtx ( Objects_Id Id, CPU_Exception_frame *ctx ) {
+
+ memcpy (&(SavedContext), ctx, sizeof(CPU_Exception_frame));
+ return 0;
+}
+
+
+/****** Remove the context of the specified Id thread *********/
+/****** If Id = -1, then return the first context *********/
+
+
+int PopExceptCtx ( Objects_Id Id ) {
+
+ Exception_context *ExtractCtx;
+
+ if (FirstCtx == NULL) return -1;
+
+ if (Id == -1) {
+ ExtractCtx = LastCtx;
+ LastCtx = LastCtx->previous;
+ free(ExtractCtx);
+ NbExceptCtx --;
+ return 0;
+ }
+
+ ExtractCtx = LastCtx;
+
+ while (ExtractCtx->id != Id && ExtractCtx != NULL) {
+ ExtractCtx = ExtractCtx->previous;
+ }
+
+ if (ExtractCtx == NULL)
+ return -1;
+
+ if ( ExtractCtx->previous != NULL)
+ (ExtractCtx->previous)->next = ExtractCtx->next;
+
+ if ( ExtractCtx->next != NULL)
+ (ExtractCtx->next)->previous = ExtractCtx->previous;
+
+ if (ExtractCtx == FirstCtx)
+ FirstCtx = FirstCtx->next;
+ else
+ if (ExtractCtx == LastCtx)
+ LastCtx = LastCtx->previous;
+
+ free(ExtractCtx);
+ NbExceptCtx --;
+ return 0;
+}
+
+/****** Return the context of the specified Id thread *********/
+/****** If Id = -1, then return the first context *********/
+
+
+Exception_context *GetExceptCtx ( Objects_Id Id ) {
+
+ Exception_context *ExtractCtx;
+
+ if (FirstCtx == NULL) return NULL;
+
+ if (Id == -1) {
+ return LastCtx;
+ }
+
+ ExtractCtx = LastCtx;
+
+ while (ExtractCtx->id != Id && ExtractCtx != NULL) {
+ ExtractCtx = ExtractCtx->previous;
+ }
+
+ if (ExtractCtx == NULL)
+ return NULL;
+
+ return ExtractCtx;
+}
+
+/*----- Breakpoint Exception management -----*/
+
+ /*
+ * Handler for Breakpoint Exceptions :
+ * software breakpoints.
+ */
+
+void
+BreakPointExcHdl(CPU_Exception_frame *ctx)
+{
+ rtems_status_code status;
+ rtems_id continueSemId;
+
+ if ( (justSaveContext) && (ctx->idtIndex == I386_EXCEPTION_ENTER_RDBG) ) {
+ PushSavedExceptCtx (_Thread_Executing->Object.id, ctx);
+ justSaveContext = 0;
+ }
+ else {
+ if (ctx->idtIndex != DEBUG){
+ NbSerializedCtx++;
+ rtems_semaphore_obtain(serializeSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
+ NbSerializedCtx--;
+ }
+
+ currentTargetThread = _Thread_Executing->Object.id;
+
+#ifdef DDEBUG
+ printk("----------------------------------------------------------\n");
+ printk("Exception %d caught at PC %x by thread %d\n",
+ ctx->idtIndex,
+ ctx->eip,
+ _Thread_Executing->Object.id);
+ printk("----------------------------------------------------------\n");
+ printk("Processor execution context at time of the fault was :\n");
+ printk("----------------------------------------------------------\n");
+ printk(" EAX = %x EBX = %x ECX = %x EDX = %x\n",
+ ctx->eax, ctx->ebx, ctx->ecx, ctx->edx);
+ printk(" ESI = %x EDI = %x EBP = %x ESP = %x\n",
+ ctx->esi, ctx->edi, ctx->ebp, ctx->esp0);
+ printk("----------------------------------------------------------\n");
+ printk("Error code pushed by processor itself (if not 0) = %x\n",
+ ctx->faultCode);
+ printk("----------------------------------------------------------\n\n");
+#endif
+
+ status = rtems_semaphore_create (rtems_build_name('D', 'B', 'G', 'c'),
+ 0,
+ RTEMS_FIFO |
+ RTEMS_COUNTING_SEMAPHORE |
+ RTEMS_NO_INHERIT_PRIORITY |
+ RTEMS_NO_PRIORITY_CEILING |
+ RTEMS_LOCAL,
+ 0,
+ &continueSemId);
+ if (status != RTEMS_SUCCESSFUL)
+ rtems_panic ("Can't create continue semaphore: `%s'\n",rtems_status_text(status));
+
+ PushExceptCtx (_Thread_Executing->Object.id, continueSemId, ctx);
+
+ switch (ctx->idtIndex){
+ case I386_EXCEPTION_DEBUG:
+ DPRINTF((" DEBUG EXCEPTION !!!\n"));
+ ctx->eflags &= ~EFLAGS_TF;
+ ExitForSingleStep-- ;
+ rtems_semaphore_release( wakeupEventSemId );
+ break;
+
+ case I386_EXCEPTION_BREAKPOINT:
+ DPRINTF((" BREAKPOINT EXCEPTION !!!\n"));
+ rtems_semaphore_release( wakeupEventSemId );
+ break;
+
+ case I386_EXCEPTION_ENTER_RDBG:
+ DPRINTF((" ENTER RDBG !!!\n"));
+ rtems_semaphore_release( wakeupEventSemId );
+ break;
+
+ default:
+ DPRINTF((" OTHER EXCEPTION !!!\n"));
+ rtems_semaphore_release( wakeupEventSemId );
+ break;
+ }
+
+ rtems_semaphore_obtain(continueSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
+
+ PopExceptCtx (_Thread_Executing->Object.id);
+ rtems_semaphore_delete(continueSemId);
+ }
+}
+
+
+