1 files changed, 123 insertions, 0 deletions
diff --git a/sys/powerpc/powerpc/gdb_machdep.c b/sys/powerpc/powerpc/gdb_machdep.c
new file mode 100644
index 000000000000..4bccfede47ad
--- /dev/null
+++ b/sys/powerpc/powerpc/gdb_machdep.c
@@ -0,0 +1,123 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2006 Marcel Moolenaar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kdb.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/signal.h>
+
+#include <machine/gdb_machdep.h>
+#include <machine/pcb.h>
+
+#include <machine/hid.h>
+#include <machine/spr.h>
+
+#include <machine/trap.h>
+
+#include <gdb/gdb.h>
+#include <gdb/gdb_int.h>
+
+extern vm_offset_t __startkernel;
+
+void *
+gdb_cpu_getreg(int regnum, size_t *regsz)
+{
+
+	*regsz = gdb_cpu_regsz(regnum);
+
+	if (kdb_thread == curthread) {
+		if (regnum == 0 || (regnum >= 2 && regnum <= 31))
+			return (kdb_frame->fixreg + regnum);
+		if (regnum == 64)
+			return (&kdb_frame->srr0);
+		if (regnum == 67)
+			return (&kdb_frame->lr);
+	}
+
+	if (regnum == 1)
+		return (&kdb_thrctx->pcb_sp);
+	if (regnum == 2 && *regsz == 8)
+		return (&kdb_thrctx->pcb_toc);
+	if (regnum >= 12 && regnum <= 31)
+		return (kdb_thrctx->pcb_context + (regnum - 12));
+	if (regnum == 64)
+		return (&kdb_thrctx->pcb_lr);
+
+	return (NULL);
+}
+
+void
+gdb_cpu_setreg(int regnum, void *val)
+{
+
+	switch (regnum) {
+	case GDB_REG_PC:
+		break;
+	}
+}
+
+int
+gdb_cpu_signal(int vector, int dummy __unused)
+{
+#if defined(BOOKE)
+	if (vector == EXC_DEBUG || vector == EXC_PGM)
+		return (SIGTRAP);
+#else
+	if (vector == EXC_TRC || vector == EXC_RUNMODETRC)
+		return (SIGTRAP);
+#endif
+
+	return (SIGEMT);
+}
+
+void
+gdb_cpu_do_offsets(void)
+{
+	/*
+	 * On PowerPC, .text starts at KERNBASE + SIZEOF_HEADERS and
+	 * text segment at KERNBASE - SIZEOF_HEADERS.
+	 * On PowerPC64, .text starts at KERNBASE and text segment at
+	 * KERNBASE - 0x100.
+	 * In both cases, the text segment offset is aligned to 64KB.
+	 *
+	 * The __startkernel variable holds the relocated KERNBASE offset.
+	 * Thus, as long as SIZEOF_HEADERS doesn't get bigger than 0x100
+	 * (which would lead to other issues), aligning __startkernel to
+	 * 64KB gives the text segment offset.
+	 *
+	 * TODO: Add DataSeg to response. On PowerPC64 all sections reside
+	 * in a single LOAD segment, but on PowerPC modifiable data reside
+	 * in a separate segment, that GDB should also relocate.
+	 */
+	gdb_tx_begin(0);
+	gdb_tx_str("TextSeg=");
+	gdb_tx_varhex(__startkernel & ~0xffff);
+	gdb_tx_end();
+}