1 files changed, 253 insertions, 0 deletions
diff --git a/gnu/usr.bin/gdb/kgdb/trgt_mips.c b/gnu/usr.bin/gdb/kgdb/trgt_mips.c
new file mode 100644
index 000000000000..17ea6fe4ca1a
--- /dev/null
+++ b/gnu/usr.bin/gdb/kgdb/trgt_mips.c
@@ -0,0 +1,253 @@
+/*
+ * Copyright (c) 2007 Juniper Networks, Inc.
+ * Copyright (c) 2004 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.
+ *
+ * from: src/gnu/usr.bin/gdb/kgdb/trgt_alpha.c,v 1.2.2.1 2005/09/15 05:32:10 marcel
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <machine/asm.h>
+#include <machine/pcb.h>
+#include <machine/frame.h>
+#include <err.h>
+#include <kvm.h>
+#include <string.h>
+
+#include <defs.h>
+#include <target.h>
+#include <gdbthread.h>
+#include <inferior.h>
+#include <regcache.h>
+#include <frame-unwind.h>
+#include <mips-tdep.h>
+
+#ifndef	CROSS_DEBUGGER
+#include <machine/pcb.h>
+#endif
+
+#include "kgdb.h"
+
+CORE_ADDR
+kgdb_trgt_core_pcb(u_int cpuid)
+{
+	return (kgdb_trgt_stop_pcb(cpuid, sizeof(struct pcb)));
+}
+
+void
+kgdb_trgt_fetch_registers(int regno __unused)
+{
+#ifndef	CROSS_DEBUGGER
+	struct kthr *kt;
+	struct pcb pcb;
+
+	kt = kgdb_thr_lookup_tid(ptid_get_pid(inferior_ptid));
+	if (kt == NULL)
+		return;
+	if (kvm_read(kvm, kt->pcb, &pcb, sizeof(pcb)) != sizeof(pcb)) {
+		warnx("kvm_read: %s", kvm_geterr(kvm));
+		memset(&pcb, 0, sizeof(pcb));
+	}
+
+	supply_register(MIPS_S0_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S0]);
+	supply_register(MIPS_S1_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S1]);
+	supply_register(MIPS_S2_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S2]);
+	supply_register(MIPS_S3_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S3]);
+	supply_register(MIPS_S4_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S4]);
+	supply_register(MIPS_S5_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S5]);
+	supply_register(MIPS_S6_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S6]);
+	supply_register(MIPS_S7_REGNUM, (char *)&pcb.pcb_context[PCB_REG_S7]);
+	supply_register(MIPS_SP_REGNUM, (char *)&pcb.pcb_context[PCB_REG_SP]);
+	supply_register(MIPS_FP_REGNUM, (char *)&pcb.pcb_context[PCB_REG_GP]);
+	supply_register(MIPS_RA_REGNUM, (char *)&pcb.pcb_context[PCB_REG_RA]);
+	supply_register(MIPS_EMBED_PC_REGNUM, (char *)&pcb.pcb_context[PCB_REG_PC]);
+#endif
+}
+
+void
+kgdb_trgt_store_registers(int regno __unused)
+{
+
+	fprintf_unfiltered(gdb_stderr, "Unimplemented function: %s\n", __func__);
+}
+
+void
+kgdb_trgt_new_objfile(struct objfile *objfile)
+{
+}
+
+#ifndef CROSS_DEBUGGER
+struct kgdb_frame_cache {
+	CORE_ADDR	pc;
+	CORE_ADDR	sp;
+};
+
+static int kgdb_trgt_frame_offset[] = {
+	offsetof(struct trapframe, zero),
+	offsetof(struct trapframe, ast),
+	offsetof(struct trapframe, v0),
+	offsetof(struct trapframe, v1),
+	offsetof(struct trapframe, a0),
+	offsetof(struct trapframe, a1),
+	offsetof(struct trapframe, a2),
+	offsetof(struct trapframe, a3),
+#if defined(__mips_n32) || defined(__mips_n64)
+	offsetof(struct trapframe, a4),
+	offsetof(struct trapframe, a5),
+	offsetof(struct trapframe, a6),
+	offsetof(struct trapframe, a7),
+	offsetof(struct trapframe, t0),
+	offsetof(struct trapframe, t1),
+	offsetof(struct trapframe, t2),
+	offsetof(struct trapframe, t3),
+#else
+	offsetof(struct trapframe, t0),
+	offsetof(struct trapframe, t1),
+	offsetof(struct trapframe, t2),
+	offsetof(struct trapframe, t3),
+	offsetof(struct trapframe, t4),
+	offsetof(struct trapframe, t5),
+	offsetof(struct trapframe, t6),
+	offsetof(struct trapframe, t7),
+#endif
+	offsetof(struct trapframe, s0),
+	offsetof(struct trapframe, s1),
+	offsetof(struct trapframe, s2),
+	offsetof(struct trapframe, s3),
+	offsetof(struct trapframe, s4),
+	offsetof(struct trapframe, s5),
+	offsetof(struct trapframe, s6),
+	offsetof(struct trapframe, s7),
+	offsetof(struct trapframe, t8),
+	offsetof(struct trapframe, t9),
+	offsetof(struct trapframe, k0),
+	offsetof(struct trapframe, k1),
+	offsetof(struct trapframe, gp),
+	offsetof(struct trapframe, sp),
+	offsetof(struct trapframe, s8),
+	offsetof(struct trapframe, ra),
+};
+
+static struct kgdb_frame_cache *
+kgdb_trgt_frame_cache(struct frame_info *next_frame, void **this_cache)
+{
+	char buf[MAX_REGISTER_SIZE];
+	struct kgdb_frame_cache *cache;
+
+	cache = *this_cache;
+	if (cache == NULL) {
+		cache = FRAME_OBSTACK_ZALLOC(struct kgdb_frame_cache);
+		*this_cache = cache;
+		cache->pc = frame_func_unwind(next_frame);
+		frame_unwind_register(next_frame, SP_REGNUM, buf);
+		cache->sp = extract_unsigned_integer(buf,
+		    register_size(current_gdbarch, SP_REGNUM));
+	}
+	return (cache);
+}
+
+static void
+kgdb_trgt_trapframe_this_id(struct frame_info *next_frame, void **this_cache,
+    struct frame_id *this_id)
+{
+	struct kgdb_frame_cache *cache;
+
+	cache = kgdb_trgt_frame_cache(next_frame, this_cache);
+	*this_id = frame_id_build(cache->sp, cache->pc);
+}
+
+static void
+kgdb_trgt_trapframe_prev_register(struct frame_info *next_frame __unused,
+    void **this_cache __unused, int regnum __unused, int *optimizedp __unused,
+    enum lval_type *lvalp __unused, CORE_ADDR *addrp __unused,
+    int *realnump __unused, void *valuep __unused)
+{
+	char dummy_valuep[MAX_REGISTER_SIZE];
+	struct kgdb_frame_cache *cache;
+	int ofs, regsz;
+
+	regsz = register_size(current_gdbarch, regnum);
+
+	if (valuep == NULL)
+		valuep = dummy_valuep;
+	memset(valuep, 0, regsz);
+	*optimizedp = 0;
+	*addrp = 0;
+	*lvalp = not_lval;
+	*realnump = -1;
+
+	ofs = (regnum >= 0 && regnum <= MIPS_RA_REGNUM) ?
+	    kgdb_trgt_frame_offset[regnum] : -1;
+	if (ofs == -1)
+		return;
+
+	cache = kgdb_trgt_frame_cache(next_frame, this_cache);
+	*addrp = cache->sp + ofs * 8;
+	*lvalp = lval_memory;
+	target_read_memory(*addrp, valuep, regsz);
+}
+
+static const struct frame_unwind kgdb_trgt_trapframe_unwind = {
+	UNKNOWN_FRAME,
+	&kgdb_trgt_trapframe_this_id,
+	&kgdb_trgt_trapframe_prev_register
+};
+#endif
+
+const struct frame_unwind *
+kgdb_trgt_trapframe_sniffer(struct frame_info *next_frame)
+{
+#ifndef CROSS_DEBUGGER
+	char *pname;
+	CORE_ADDR pc;
+
+	pc = frame_pc_unwind(next_frame);
+	pname = NULL;
+	find_pc_partial_function(pc, &pname, NULL, NULL);
+	if (pname == NULL)
+		return (NULL);
+	if ((strcmp(pname, "MipsKernIntr") == 0) ||
+	    (strcmp(pname, "MipsKernGenException") == 0) ||
+	    (strcmp(pname, "MipsUserIntr") == 0) ||
+	    (strcmp(pname, "MipsUserGenException") == 0))
+		return (&kgdb_trgt_trapframe_unwind);
+#endif
+	return (NULL);
+}
+
+/*
+ * This function ensures, that the PC is inside the
+ * function section which is understood by GDB.
+ *
+ * Return 0 when fixup is necessary, -1 otherwise.
+ */
+int
+kgdb_trgt_pc_fixup(CORE_ADDR *pc __unused)
+{
+
+	return (-1);
+}