riscv64 libkvm support

copied from aarch64 with minimal changes

diff --git a/lib/libkvm/kvm_riscv64.c b/lib/libkvm/kvm_riscv64.c
new file mode 100644 (file)
index 0000000..10d3d6b
--- /dev/null
+++ b/lib/libkvm/kvm_riscv64.c
@@ -0,0 +1,131 @@
+/*     $OpenBSD: kvm_riscv64.c,v 1.1 2021/04/29 20:00:18 drahn Exp $   */
+/*
+ * Copyright (c) 2006 Miodrag Vallat.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice, this permission notice, and the disclaimer below
+ * appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+/*-
+ * Copyright (C) 1996 Wolfgang Solfrank.
+ * Copyright (C) 1996 TooLs GmbH.
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by TooLs GmbH.
+ * 4. The name of TooLs GmbH may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
+ */
+
+/*
+ * RISCV machine dependent routines for kvm.
+ */
+
+#include <sys/param.h>
+#include <sys/core.h>
+#include <sys/kcore.h>
+#include <sys/vnode.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <nlist.h>
+#include <kvm.h>
+
+#include <db.h>
+
+#include "kvm_private.h"
+
+#include <machine/kcore.h>
+
+void
+_kvm_freevtop(kvm_t *kd)
+{
+       free(kd->vmst);
+       kd->vmst = NULL;
+}
+
+int
+_kvm_initvtop(kvm_t *kd)
+{
+       return (0);
+}
+
+/*
+ * Translate a kernel virtual address to a physical address by walking
+ * the kernels page table.
+ */
+
+int
+_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
+{
+       cpu_kcore_hdr_t *cpup = kd->cpu_data;
+
+       if (ISALIVE(kd)) {
+               _kvm_err(kd, 0, "vatop called in live kernel!");
+               return (0);
+       }
+
+       /*
+        * This relies upon the kernel text and data being contiguous
+        * in the first memory segment.
+        * Other virtual addresses are not reachable yet.
+        */
+
+       if (va >= cpup->kernelbase + cpup->kerneloffs &&
+           va < cpup->kernelbase + cpup->kerneloffs + cpup->staticsize) {
+               *pa = (va - cpup->kernelbase) +
+                   (paddr_t)cpup->ram_segs[0].start;
+               return (int)(kd->nbpg - (va & (kd->nbpg - 1)));
+       }
+
+       _kvm_err(kd, 0, "kvm_vatop: va %lx unreachable", va);
+       return (0);
+}
+
+off_t
+_kvm_pa2off(kvm_t *kd, paddr_t pa)
+{
+       cpu_kcore_hdr_t *cpup = kd->cpu_data;
+       phys_ram_seg_t *mp = cpup->ram_segs;
+       off_t off = 0;
+       int block;
+
+       for (block = 0; block < NPHYS_RAM_SEGS; block++, mp++) {
+               if (pa >= mp->start && pa < mp->start + mp->size)
+                       return (kd->dump_off + off +
+                           (off_t)(pa - (paddr_t)mp->start));
+               off += (off_t)mp->size;
+       }
+
+       _kvm_err(kd, 0, "not a physical address: %lx", pa);
+       return (-1);
+}