crash/0051-Add-RISCV64-framework-code-support.patch

From 8ac8ab4f0e2d81b51b79b30f410c09e394b17e9c Mon Sep 17 00:00:00 2001
From: Xianting Tian <xianting.tian@linux.alibaba.com>
Date: Thu, 20 Oct 2022 09:50:06 +0800
Subject: [PATCH 51/89] Add RISCV64 framework code support

This patch mainly added some environment configurations, macro definitions,
specific architecture structures and some function declarations supported
by the RISCV64 architecture.

We can use the build command to get the simplest version crash tool:
	make target=RISCV64 -j2

Co-developed-by: Lifang Xia <lifang_xia@linux.alibaba.com>
Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
 Makefile            |   7 +-
 README              |   6 +-
 configure.c         |  43 ++++++++++++-
 defs.h              | 154 +++++++++++++++++++++++++++++++++++++++++++-
 diskdump.c          |  11 +++-
 help.c              |   6 +-
 lkcd_vmdump_v1.h    |   8 +--
 lkcd_vmdump_v2_v3.h |   8 +--
 netdump.c           |   9 ++-
 ramdump.c           |   2 +
 riscv64.c           |  54 ++++++++++++++++
 symbols.c           |  10 +++
 12 files changed, 294 insertions(+), 24 deletions(-)
 create mode 100644 riscv64.c

diff --git a/Makefile b/Makefile
index 2549d1d39273..c0de5ef8ff75 100644
--- a/Makefile
+++ b/Makefile
@@ -64,7 +64,7 @@ CFILES=main.c tools.c global_data.c memory.c filesys.c help.c task.c \
 	kernel.c test.c gdb_interface.c configure.c net.c dev.c bpf.c \
 	printk.c \
 	alpha.c x86.c ppc.c ia64.c s390.c s390x.c s390dbf.c ppc64.c x86_64.c \
-	arm.c arm64.c mips.c mips64.c sparc64.c \
+	arm.c arm64.c mips.c mips64.c riscv64.c sparc64.c \
 	extensions.c remote.c va_server.c va_server_v1.c symbols.c cmdline.c \
 	lkcd_common.c lkcd_v1.c lkcd_v2_v3.c lkcd_v5.c lkcd_v7.c lkcd_v8.c\
 	lkcd_fix_mem.c s390_dump.c lkcd_x86_trace.c \
@@ -84,7 +84,7 @@ OBJECT_FILES=main.o tools.o global_data.o memory.o filesys.o help.o task.o \
 	build_data.o kernel.o test.o gdb_interface.o net.o dev.o bpf.o \
 	printk.o \
 	alpha.o x86.o ppc.o ia64.o s390.o s390x.o s390dbf.o ppc64.o x86_64.o \
-	arm.o arm64.o mips.o mips64.o sparc64.o \
+	arm.o arm64.o mips.o mips64.o riscv64.o sparc64.o \
 	extensions.o remote.o va_server.o va_server_v1.o symbols.o cmdline.o \
 	lkcd_common.o lkcd_v1.o lkcd_v2_v3.o lkcd_v5.o lkcd_v7.o lkcd_v8.o \
 	lkcd_fix_mem.o s390_dump.o netdump.o diskdump.o makedumpfile.o xendump.o \
@@ -447,6 +447,9 @@ mips.o: ${GENERIC_HFILES} ${REDHAT_HFILES} mips.c
 mips64.o: ${GENERIC_HFILES} ${REDHAT_HFILES} mips64.c
 	${CC} -c ${CRASH_CFLAGS} mips64.c ${WARNING_OPTIONS} ${WARNING_ERROR}
 
+riscv64.o: ${GENERIC_HFILES} ${REDHAT_HFILES} riscv64.c
+	${CC} -c ${CRASH_CFLAGS} riscv64.c ${WARNING_OPTIONS} ${WARNING_ERROR}
+
 sparc64.o: ${GENERIC_HFILES} ${REDHAT_HFILES} sparc64.c
 	${CC} -c ${CRASH_CFLAGS} sparc64.c ${WARNING_OPTIONS} ${WARNING_ERROR}
 
diff --git a/README b/README
index 00386f6f8224..13a9de5d2ccb 100644
--- a/README
+++ b/README
@@ -37,8 +37,8 @@
   These are the current prerequisites: 
 
   o  At this point, x86, ia64, x86_64, ppc64, ppc, arm, arm64, alpha, mips,
-     mips64, s390 and s390x-based kernels are supported.  Other architectures
-     may be addressed in the future.
+     mips64, riscv64, s390 and s390x-based kernels are supported.  Other
+     architectures may be addressed in the future.
 
   o  One size fits all -- the utility can be run on any Linux kernel version
      version dating back to 2.2.5-15.  A primary design goal is to always
@@ -98,6 +98,8 @@
      arm64 dumpfiles may be built by typing "make target=ARM64".
   o  On an x86_64 host, an x86_64 binary that can be used to analyze
      ppc64le dumpfiles may be built by typing "make target=PPC64".
+  o  On an x86_64 host, an x86_64 binary that can be used to analyze
+     riscv64 dumpfiles may be built by typing "make target=RISCV64".
 
   Traditionally when vmcores are compressed via the makedumpfile(8) facility
   the libz compression library is used, and by default the crash utility
diff --git a/configure.c b/configure.c
index b691a139b960..7de89553dbd3 100644
--- a/configure.c
+++ b/configure.c
@@ -107,6 +107,7 @@ void add_extra_lib(char *);
 #undef MIPS
 #undef SPARC64
 #undef MIPS64
+#undef RISCV64
 
 #define UNKNOWN 0
 #define X86     1
@@ -122,6 +123,7 @@ void add_extra_lib(char *);
 #define MIPS    11
 #define SPARC64 12
 #define MIPS64  13
+#define RISCV64 14
 
 #define TARGET_X86    "TARGET=X86"
 #define TARGET_ALPHA  "TARGET=ALPHA"
@@ -136,6 +138,7 @@ void add_extra_lib(char *);
 #define TARGET_MIPS   "TARGET=MIPS"
 #define TARGET_MIPS64 "TARGET=MIPS64"
 #define TARGET_SPARC64 "TARGET=SPARC64"
+#define TARGET_RISCV64 "TARGET=RISCV64"
 
 #define TARGET_CFLAGS_X86    "TARGET_CFLAGS=-D_FILE_OFFSET_BITS=64"
 #define TARGET_CFLAGS_ALPHA  "TARGET_CFLAGS="
@@ -158,6 +161,8 @@ void add_extra_lib(char *);
 #define TARGET_CFLAGS_MIPS_ON_X86_64  "TARGET_CFLAGS=-m32 -D_FILE_OFFSET_BITS=64"
 #define TARGET_CFLAGS_MIPS64          "TARGET_CFLAGS="
 #define TARGET_CFLAGS_SPARC64         "TARGET_CFLAGS="
+#define TARGET_CFLAGS_RISCV64         "TARGET_CFLAGS="
+#define TARGET_CFLAGS_RISCV64_ON_X86_64	"TARGET_CFLAGS="
 
 #define GDB_TARGET_DEFAULT        "GDB_CONF_FLAGS="
 #define GDB_TARGET_ARM_ON_X86     "GDB_CONF_FLAGS=--target=arm-elf-linux"
@@ -168,6 +173,7 @@ void add_extra_lib(char *);
 #define GDB_TARGET_PPC64_ON_X86_64  "GDB_CONF_FLAGS=--target=powerpc64le-unknown-linux-gnu"
 #define GDB_TARGET_MIPS_ON_X86     "GDB_CONF_FLAGS=--target=mipsel-elf-linux"
 #define GDB_TARGET_MIPS_ON_X86_64  "GDB_CONF_FLAGS=--target=mipsel-elf-linux CFLAGS=-m32"
+#define GDB_TARGET_RISCV64_ON_X86_64  "GDB_CONF_FLAGS=--target=riscv64-unknown-linux-gnu"
      
 /*
  *  The original plan was to allow the use of a particular version
@@ -394,6 +400,9 @@ get_current_configuration(struct supported_gdb_version *sp)
 #ifdef __sparc_v9__
 	target_data.target = SPARC64;
 #endif
+#if defined(__riscv) && (__riscv_xlen == 64)
+	target_data.target = RISCV64;
+#endif
 
 	set_initial_target(sp);
 
@@ -447,6 +456,12 @@ get_current_configuration(struct supported_gdb_version *sp)
 			if ((target_data.initial_gdb_target != UNKNOWN) &&
 			    (target_data.host != target_data.initial_gdb_target))
 				arch_mismatch(sp);
+		} else if ((target_data.target == X86_64) &&
+			(name_to_target((char *)target_data.target_as_param) == RISCV64)) {
+			/*
+			 *  Build an RISCV64 crash binary on an X86_64 host.
+			 */
+			target_data.target = RISCV64;
 		} else {
 			fprintf(stderr,
 			    "\ntarget=%s is not supported on the %s host architecture\n\n",
@@ -487,6 +502,14 @@ get_current_configuration(struct supported_gdb_version *sp)
 		    (target_data.target != MIPS64))
 			arch_mismatch(sp);
 
+		if ((target_data.initial_gdb_target == RISCV64) &&
+		    (target_data.target != RISCV64)) {
+			if (target_data.target == X86_64)
+				target_data.target = RISCV64;
+			else
+				arch_mismatch(sp);
+		}
+
 		if ((target_data.initial_gdb_target == X86) &&
 		    (target_data.target != X86)) {
 			if (target_data.target == X86_64) 
@@ -650,6 +673,9 @@ show_configuration(void)
 	case SPARC64:
 		printf("TARGET: SPARC64\n");
 		break;
+	case RISCV64:
+		printf("TARGET: RISCV64\n");
+		break;
 	}
 
 	if (strlen(target_data.program)) {
@@ -767,6 +793,14 @@ build_configure(struct supported_gdb_version *sp)
 		target = TARGET_SPARC64;
 		target_CFLAGS = TARGET_CFLAGS_SPARC64;
 		break;
+	case RISCV64:
+		target = TARGET_RISCV64;
+		if (target_data.host == X86_64) {
+			target_CFLAGS = TARGET_CFLAGS_RISCV64_ON_X86_64;
+			gdb_conf_flags = GDB_TARGET_RISCV64_ON_X86_64;
+		} else
+			target_CFLAGS = TARGET_CFLAGS_RISCV64;
+		break;
 	}
 
 	ldflags = get_extra_flags("LDFLAGS.extra", NULL);
@@ -1364,7 +1398,7 @@ make_spec_file(struct supported_gdb_version *sp)
 	printf("Vendor: Red Hat, Inc.\n");
 	printf("Packager: Dave Anderson <anderson@redhat.com>\n");
 	printf("ExclusiveOS: Linux\n");
-	printf("ExclusiveArch: %%{ix86} alpha ia64 ppc ppc64 ppc64pseries ppc64iseries x86_64 s390 s390x arm aarch64 ppc64le mips mipsel mips64el sparc64\n");
+	printf("ExclusiveArch: %%{ix86} alpha ia64 ppc ppc64 ppc64pseries ppc64iseries x86_64 s390 s390x arm aarch64 ppc64le mips mipsel mips64el sparc64 riscv64\n");
 	printf("Buildroot: %%{_tmppath}/%%{name}-root\n");
 	printf("BuildRequires: ncurses-devel zlib-devel bison\n");
 	printf("Requires: binutils\n");
@@ -1597,6 +1631,8 @@ set_initial_target(struct supported_gdb_version *sp)
 		target_data.initial_gdb_target = MIPS;
 	else if (strncmp(buf, "SPARC64", strlen("SPARC64")) == 0)
 		target_data.initial_gdb_target = SPARC64;
+	else if (strncmp(buf, "RISCV64", strlen("RISCV64")) == 0)
+		target_data.initial_gdb_target = RISCV64;
 }
 
 char *
@@ -1617,6 +1653,7 @@ target_to_name(int target)
 	case MIPS:   return("MIPS");
 	case MIPS64: return("MIPS64");
 	case SPARC64: return("SPARC64");
+	case RISCV64: return("RISCV64");
 	}
 
 	return "UNKNOWN";
@@ -1681,6 +1718,10 @@ name_to_target(char *name)
 		return MIPS64;
 	else if (strncmp(name, "sparc64", strlen("sparc64")) == 0)
 		return SPARC64;
+	else if (strncmp(name, "RISCV64", strlen("RISCV64")) == 0)
+		return RISCV64;
+	else if (strncmp(name, "riscv64", strlen("riscv64")) == 0)
+		return RISCV64;
 
 	return UNKNOWN;
 }
diff --git a/defs.h b/defs.h
index e4732c885371..f46b666dde13 100644
--- a/defs.h
+++ b/defs.h
@@ -76,7 +76,7 @@
 #if !defined(X86) && !defined(X86_64) && !defined(ALPHA) && !defined(PPC) && \
     !defined(IA64) && !defined(PPC64) && !defined(S390) && !defined(S390X) && \
     !defined(ARM) && !defined(ARM64) && !defined(MIPS) && !defined(MIPS64) && \
-    !defined(SPARC64)
+    !defined(RISCV64) && !defined(SPARC64)
 #ifdef __alpha__
 #define ALPHA
 #endif
@@ -118,6 +118,9 @@
 #ifdef __sparc_v9__
 #define SPARC64
 #endif
+#if defined(__riscv) && (__riscv_xlen == 64)
+#define RISCV64
+#endif
 #endif
 
 #ifdef X86
@@ -159,6 +162,9 @@
 #ifdef SPARC64
 #define NR_CPUS  (4096)
 #endif
+#ifdef RISCV64
+#define NR_CPUS  (256)
+#endif
 
 #define NR_DEVICE_DUMPS (64)
 
@@ -3486,6 +3492,63 @@ struct arm64_stackframe {
 #define _MAX_PHYSMEM_BITS       48
 #endif  /* MIPS64 */
 
+#ifdef RISCV64
+#define _64BIT_
+#define MACHINE_TYPE		"RISCV64"
+
+/*
+ * Direct memory mapping
+ */
+#define PTOV(X) 									\
+	(((unsigned long)(X)+(machdep->kvbase)) - machdep->machspec->phys_base)
+#define VTOP(X) ({									\
+	ulong _X = X;									\
+	(THIS_KERNEL_VERSION >= LINUX(5,13,0) &&					\
+		(_X) >= machdep->machspec->kernel_link_addr) ?				\
+		(((unsigned long)(_X)-(machdep->machspec->kernel_link_addr)) +		\
+		 machdep->machspec->phys_base):						\
+		(((unsigned long)(_X)-(machdep->kvbase)) +				\
+		 machdep->machspec->phys_base);						\
+	})
+#define PAGEBASE(X)		(((ulong)(X)) & (ulong)machdep->pagemask)
+
+/*
+ * Stack size order
+ */
+#define THREAD_SIZE_ORDER	2
+
+#define PAGE_OFFSET		(machdep->machspec->page_offset)
+#define VMALLOC_START		(machdep->machspec->vmalloc_start_addr)
+#define VMALLOC_END		(machdep->machspec->vmalloc_end)
+#define VMEMMAP_VADDR		(machdep->machspec->vmemmap_vaddr)
+#define VMEMMAP_END		(machdep->machspec->vmemmap_end)
+#define MODULES_VADDR		(machdep->machspec->modules_vaddr)
+#define MODULES_END		(machdep->machspec->modules_end)
+#define IS_VMALLOC_ADDR(X)	riscv64_IS_VMALLOC_ADDR((ulong)(X))
+
+/* from arch/riscv/include/asm/pgtable.h */
+#define __SWP_TYPE_SHIFT	6
+#define __SWP_TYPE_BITS 	5
+#define __SWP_TYPE_MASK 	((1UL << __SWP_TYPE_BITS) - 1)
+#define __SWP_OFFSET_SHIFT	(__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
+
+#define MAX_SWAPFILES_CHECK()	BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
+
+#define SWP_TYPE(entry) 	(((entry) >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
+#define SWP_OFFSET(entry)	((entry) >> __SWP_OFFSET_SHIFT)
+#define __swp_type(entry)	SWP_TYPE(entry)
+#define __swp_offset(entry)	SWP_OFFSET(entry)
+
+#define TIF_SIGPENDING		(THIS_KERNEL_VERSION >= LINUX(2,6,23) ? 1 : 2)
+
+/* from arch/riscv/include/asm/sparsemem.h */
+#define _SECTION_SIZE_BITS	27
+#define _MAX_PHYSMEM_BITS	56 /* 56-bit physical address supported */
+#define PHYS_MASK_SHIFT 	_MAX_PHYSMEM_BITS
+#define PHYS_MASK		(((1UL) << PHYS_MASK_SHIFT) - 1)
+
+#endif  /* RISCV64 */
+
 #ifdef X86
 #define _32BIT_
 #define MACHINE_TYPE       "X86"
@@ -4534,6 +4597,10 @@ struct machine_specific {
 #define MAX_HEXADDR_STRLEN (16)
 #define UVADDR_PRLEN      (16)
 #endif
+#ifdef RISCV64
+#define MAX_HEXADDR_STRLEN (16)
+#define UVADDR_PRLEN       (16)
+#endif
 
 #define BADADDR  ((ulong)(-1))
 #define BADVAL   ((ulong)(-1))
@@ -5131,6 +5198,9 @@ void dump_build_data(void);
 #ifdef MIPS64
 #define machdep_init(X) mips64_init(X)
 #endif
+#ifdef RISCV64
+#define machdep_init(X) riscv64_init(X)
+#endif
 #ifdef SPARC64
 #define machdep_init(X) sparc64_init(X)
 #endif
@@ -5618,6 +5688,9 @@ void display_help_screen(char *);
 #ifdef SPARC64
 #define dump_machdep_table(X) sparc64_dump_machdep_table(X)
 #endif
+#ifdef RISCV64
+#define dump_machdep_table(X) riscv64_dump_machdep_table(X)
+#endif
 extern char *help_pointer[];
 extern char *help_alias[];
 extern char *help_ascii[];
@@ -6695,6 +6768,85 @@ struct machine_specific {
 
 #endif /* MIPS64 */
 
+/*
+ * riscv64.c
+ */
+void riscv64_display_regs_from_elf_notes(int, FILE *);
+
+#ifdef RISCV64
+void riscv64_init(int);
+void riscv64_dump_machdep_table(ulong);
+int riscv64_IS_VMALLOC_ADDR(ulong);
+
+#define display_idt_table() \
+	error(FATAL, "-d option is not applicable to RISCV64 architecture\n")
+
+/* from arch/riscv/include/asm/ptrace.h */
+struct riscv64_register {
+	ulong regs[36];
+};
+
+struct riscv64_pt_regs {
+	ulong badvaddr;
+	ulong cause;
+	ulong epc;
+};
+
+struct riscv64_unwind_frame {
+	ulong fp;
+	ulong sp;
+	ulong pc;
+};
+
+#define KSYMS_START	(0x1)
+
+struct machine_specific {
+	ulong phys_base;
+	ulong page_offset;
+	ulong vmalloc_start_addr;
+	ulong vmalloc_end;
+	ulong vmemmap_vaddr;
+	ulong vmemmap_end;
+	ulong modules_vaddr;
+	ulong modules_end;
+	ulong kernel_link_addr;
+
+	ulong _page_present;
+	ulong _page_read;
+	ulong _page_write;
+	ulong _page_exec;
+	ulong _page_user;
+	ulong _page_global;
+	ulong _page_accessed;
+	ulong _page_dirty;
+	ulong _page_soft;
+
+	ulong _pfn_shift;
+
+	struct riscv64_register *crash_task_regs;
+};
+/* from arch/riscv/include/asm/pgtable-bits.h */
+#define _PAGE_PRESENT	(machdep->machspec->_page_present)
+#define _PAGE_READ	(machdep->machspec->_page_read)
+#define _PAGE_WRITE	(machdep->machspec->_page_write)
+#define _PAGE_EXEC	(machdep->machspec->_page_exec)
+#define _PAGE_USER	(machdep->machspec->_page_user)
+#define _PAGE_GLOBAL	(machdep->machspec->_page_global)
+#define _PAGE_ACCESSED	(machdep->machspec->_page_accessed)
+#define _PAGE_DIRTY	(machdep->machspec->_page_dirty)
+#define _PAGE_SOFT	(machdep->machspec->_page_soft)
+#define _PAGE_SEC	(machdep->machspec->_page_sec)
+#define _PAGE_SHARE	(machdep->machspec->_page_share)
+#define _PAGE_BUF	(machdep->machspec->_page_buf)
+#define _PAGE_CACHE	(machdep->machspec->_page_cache)
+#define _PAGE_SO	(machdep->machspec->_page_so)
+#define _PAGE_SPECIAL	_PAGE_SOFT
+#define _PAGE_TABLE	_PAGE_PRESENT
+#define _PAGE_PROT_NONE _PAGE_READ
+#define _PAGE_PFN_SHIFT 10
+
+#endif /* RISCV64 */
+
 /*
  * sparc64.c
  */
diff --git a/diskdump.c b/diskdump.c
index 09fac543011a..136cbd63f799 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -622,6 +622,9 @@ restart:
 	else if (STRNEQ(header->utsname.machine, "aarch64") &&
 	    machine_type_mismatch(file, "ARM64", NULL, 0))
 		goto err;
+	else if (STRNEQ(header->utsname.machine, "riscv64") &&
+	    machine_type_mismatch(file, "RISCV64", NULL, 0))
+		goto err;
 
 	if (header->block_size != block_size) {
 		block_size = header->block_size;
@@ -780,6 +783,8 @@ restart:
 		dd->machine_type = EM_AARCH64;
 	else if (machine_type("SPARC64"))
 		dd->machine_type = EM_SPARCV9;
+	else if (machine_type("RISCV64"))
+		dd->machine_type = EM_RISCV;
 	else {
 		error(INFO, "%s: unsupported machine type: %s\n", 
 			DISKDUMP_VALID() ? "diskdump" : "compressed kdump",
@@ -1751,7 +1756,8 @@ dump_note_offsets(FILE *fp)
 			qemu = FALSE;
 			if (machine_type("X86_64") || machine_type("S390X") ||
 			    machine_type("ARM64") || machine_type("PPC64") ||
-			    machine_type("SPARC64") || machine_type("MIPS64")) {
+			    machine_type("SPARC64") || machine_type("MIPS64") ||
+			    machine_type("RISCV64")) {
 				note64 = (void *)dd->notes_buf + tot;
 				len = sizeof(Elf64_Nhdr);
 				if (STRNEQ((char *)note64 + len, "QEMU"))
@@ -2558,7 +2564,8 @@ dump_registers_for_compressed_kdump(void)
 	if (!KDUMP_CMPRS_VALID() || (dd->header->header_version < 4) ||
 	    !(machine_type("X86") || machine_type("X86_64") ||
 	      machine_type("ARM64") || machine_type("PPC64") ||
-	      machine_type("MIPS") || machine_type("MIPS64")))
+	      machine_type("MIPS") || machine_type("MIPS64") ||
+	      machine_type("RISCV64")))
 		error(FATAL, "-r option not supported for this dumpfile\n");
 
 	if (machine_type("ARM64") && (kt->cpus != dd->num_prstatus_notes))
diff --git a/help.c b/help.c
index 2cb570b244f4..bfba43f6e9fd 100644
--- a/help.c
+++ b/help.c
@@ -9518,8 +9518,8 @@ char *README[] = {
 "  These are the current prerequisites: ",
 "",
 "  o  At this point, x86, ia64, x86_64, ppc64, ppc, arm, arm64, alpha, mips,",
-"     mips64, s390 and s390x-based kernels are supported.  Other architectures",
-"     may be addressed in the future.",
+"     mips64, riscv64, s390 and s390x-based kernels are supported.  Other",
+"     architectures may be addressed in the future.",
 "",
 "  o  One size fits all -- the utility can be run on any Linux kernel version",
 "     version dating back to 2.2.5-15.  A primary design goal is to always",
@@ -9578,6 +9578,8 @@ README_ENTER_DIRECTORY,
 "     arm64 dumpfiles may be built by typing \"make target=ARM64\".",
 "  o  On an x86_64 host, an x86_64 binary that can be used to analyze",
 "     ppc64le dumpfiles may be built by typing \"make target=PPC64\".",
+"  o  On an x86_64 host, an x86_64 binary that can be used to analyze",
+"     riscv64 dumpfiles may be built by typing \"make target=RISCV64\".",
 "",
 "  Traditionally when vmcores are compressed via the makedumpfile(8) facility",
 "  the libz compression library is used, and by default the crash utility",
diff --git a/lkcd_vmdump_v1.h b/lkcd_vmdump_v1.h
index 4933427fc755..98ee09495869 100644
--- a/lkcd_vmdump_v1.h
+++ b/lkcd_vmdump_v1.h
@@ -114,14 +114,8 @@ typedef struct _dump_header_s {
 	struct new_utsname   dh_utsname;
 
 	/* the dump registers */
-#ifndef IA64
-#ifndef S390
-#ifndef S390X
-#ifndef ARM64
+#if !defined(IA64) && !defined(S390) && !defined(S390X) && !defined(ARM64) && !defined(RISCV64)
 	struct pt_regs       dh_regs;
-#endif
-#endif
-#endif
 #endif
 
 	/* the address of the current task */
diff --git a/lkcd_vmdump_v2_v3.h b/lkcd_vmdump_v2_v3.h
index 984c2c25e3c6..ef3067f88e1e 100644
--- a/lkcd_vmdump_v2_v3.h
+++ b/lkcd_vmdump_v2_v3.h
@@ -37,7 +37,7 @@
 
 #if defined(ARM) || defined(X86) || defined(PPC) || defined(S390) || \
 	defined(S390X) || defined(ARM64) || defined(MIPS) || \
-	defined(MIPS64) || defined(SPARC64)
+	defined(MIPS64) || defined(SPARC64) || defined(RISCV64)
 
 /*
  * Kernel header file for Linux crash dumps.
@@ -84,13 +84,9 @@ typedef struct _dump_header_asm_s {
 	uint32_t             dha_eip;
 
 	/* the dump registers */
-#ifndef S390
-#ifndef S390X
-#ifndef ARM64
+#if !defined(S390) && !defined(S390X) && !defined(ARM64) && !defined(RISCV64)
 	struct pt_regs       dha_regs;
 #endif
-#endif
-#endif
 
 } dump_header_asm_t;
 
diff --git a/netdump.c b/netdump.c
index e8721d89f1a3..c4c8baae0d20 100644
--- a/netdump.c
+++ b/netdump.c
@@ -300,6 +300,12 @@ is_netdump(char *file, ulong source_query)
 				goto bailout;
 			break;
 
+		case EM_RISCV:
+			if (machine_type_mismatch(file, "RISCV64", NULL,
+			    source_query))
+				goto bailout;
+			break;
+
 		default:
 			if (machine_type_mismatch(file, "(unknown)", NULL,
 			    source_query))
@@ -2935,7 +2941,8 @@ dump_registers_for_elf_dumpfiles(void)
 
         if (!(machine_type("X86") || machine_type("X86_64") || 
 	    machine_type("ARM64") || machine_type("PPC64") ||
-	    machine_type("MIPS") || machine_type("MIPS64")))
+	    machine_type("MIPS") || machine_type("MIPS64") ||
+	    machine_type("RISCV64")))
                 error(FATAL, "-r option not supported for this dumpfile\n");
 
 	if (NETDUMP_DUMPFILE()) {
diff --git a/ramdump.c b/ramdump.c
index a206fcbbab3c..d2bd7ffb0b4b 100644
--- a/ramdump.c
+++ b/ramdump.c
@@ -188,6 +188,8 @@ char *ramdump_to_elf(void)
 		e_machine = EM_MIPS;
 	else if (machine_type("X86_64"))
 		e_machine = EM_X86_64;
+	else if (machine_type("RISCV64"))
+		e_machine = EM_RISCV;
 	else
 		error(FATAL, "ramdump: unsupported machine type: %s\n", 
 			MACHINE_TYPE);
diff --git a/riscv64.c b/riscv64.c
new file mode 100644
index 000000000000..4f858a418a8c
--- /dev/null
+++ b/riscv64.c
@@ -0,0 +1,54 @@
+/* riscv64.c - core analysis suite
+ *
+ * Copyright (C) 2022 Alibaba Group Holding Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include "defs.h"
+#ifdef RISCV64
+
+#include <elf.h>
+
+void
+riscv64_dump_machdep_table(ulong arg)
+{
+}
+
+/*
+ *  Include both vmalloc'd and module address space as VMALLOC space.
+ */
+int
+riscv64_IS_VMALLOC_ADDR(ulong vaddr)
+{
+	return ((vaddr >= VMALLOC_START && vaddr <= VMALLOC_END) ||
+		(vaddr >= VMEMMAP_VADDR && vaddr <= VMEMMAP_END) ||
+		(vaddr >= MODULES_VADDR && vaddr <= MODULES_END));
+}
+
+void
+riscv64_init(int when)
+{
+}
+
+void
+riscv64_display_regs_from_elf_notes(int cpu, FILE *ofp)
+{
+}
+
+#else /* !RISCV64 */
+
+void
+riscv64_display_regs_from_elf_notes(int cpu, FILE *ofp)
+{
+	return;
+}
+
+#endif /* !RISCV64 */
diff --git a/symbols.c b/symbols.c
index 657f50706819..d1b35a56aa71 100644
--- a/symbols.c
+++ b/symbols.c
@@ -3745,6 +3745,11 @@ is_kernel(char *file)
 				goto bailout;
 			break;
 
+		case EM_RISCV:
+			if (machine_type_mismatch(file, "RISCV64", NULL, 0))
+				goto bailout;
+			break;
+
 		default:
 			if (machine_type_mismatch(file, "(unknown)", NULL, 0))
 				goto bailout;
@@ -4004,6 +4009,11 @@ is_shared_object(char *file)
 			if (machine_type("MIPS64"))
 				return TRUE;
 			break;
+
+		case EM_RISCV:
+			if (machine_type("RISCV64"))
+				return TRUE;
+			break;
 		}
 
 		if (CRASHDEBUG(1))
-- 
2.37.1