From 21b7d6492cf0a77a74c09a370c206df623930c43 Mon Sep 17 00:00:00 2001
From: wangjunqiang <wangjunqiang@iscas.ac.cn>
Date: Fri, 16 Sep 2022 10:37:54 +0800
Subject: [PATCH] add riscv64 support

---
 src/gcore.mk                  | 10 ++++
 src/libgcore/gcore_coredump.c |  2 +-
 src/libgcore/gcore_defs.h     | 47 ++++++++++++++++--
 src/libgcore/gcore_riscv64.c  | 91 +++++++++++++++++++++++++++++++++++
 4 files changed, 145 insertions(+), 5 deletions(-)
 create mode 100644 src/libgcore/gcore_riscv64.c

diff --git a/src/gcore.mk b/src/gcore.mk
index 4af292b..e986871 100644
--- a/src/gcore.mk
+++ b/src/gcore.mk
@@ -60,6 +60,12 @@ ifeq ($(shell arch), ppc64le)
   ARCH=SUPPORTED
 endif
 
+ifeq ($(shell arch), riscv64)
+  TARGET=RISCV64
+  TARGET_CFLAGS=
+  ARCH=SUPPORTED
+endif
+
 ifeq ($(shell /bin/ls /usr/include/crash/defs.h 2>/dev/null), /usr/include/crash/defs.h)
   INCDIR=/usr/include/crash
 endif
@@ -99,6 +105,10 @@ ifneq (,$(findstring $(TARGET), PPC64))
 GCORE_CFILES += libgcore/gcore_ppc64.c
 endif
 
+ifneq (,$(findstring $(TARGET), RISCV64))
+GCORE_CFILES += libgcore/gcore_riscv64.c
+endif
+
 GCORE_OFILES = $(patsubst %.c,%.o,$(GCORE_CFILES))
 
 COMMON_CFLAGS=-Wall -I$(INCDIR) -I./libgcore -fPIC -D$(TARGET) \
diff --git a/src/libgcore/gcore_coredump.c b/src/libgcore/gcore_coredump.c
index 3d0c0fc..e9ba91a 100644
--- a/src/libgcore/gcore_coredump.c
+++ b/src/libgcore/gcore_coredump.c
@@ -752,7 +752,7 @@ fill_prstatus_note(struct elf_note_info *info, struct task_context *tc,
 		   struct memelfnote *memnote)
 {
 	struct elf_prstatus *prstatus;
-#if defined(X86) || defined(X86_64) || defined(ARM) || defined(MIPS) || defined(PPC64)
+#if defined(X86) || defined(X86_64) || defined(ARM) || defined(MIPS) || defined(PPC64) || defined(RISCV64)
 	struct user_regs_struct *regs = (struct user_regs_struct *)memnote->data;
 #endif
 #ifdef ARM64
diff --git a/src/libgcore/gcore_defs.h b/src/libgcore/gcore_defs.h
index df87851..32d6553 100644
--- a/src/libgcore/gcore_defs.h
+++ b/src/libgcore/gcore_defs.h
@@ -166,6 +166,34 @@
 #define Elf_Nhdr Elf64_Nhdr
 #endif
 
+#ifdef RISCV64
+#define ELF_EXEC_PAGESIZE PAGESIZE()
+
+#define ELF_MACHINE EM_RISCV
+#define ELF_OSABI ELFOSABI_NONE
+
+#define ELF_CLASS ELFCLASS64
+
+#ifndef ELF_DATA
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define ELF_DATA ELFDATA2LSB
+#else
+#define ELF_DATA ELFDATA2MSB
+#endif
+#endif
+
+#define ELF_ARCH EM_RISCV
+
+#define Elf_Half Elf64_Half
+#define Elf_Word Elf64_Word
+#define Elf_Off Elf64_Off
+
+#define Elf_Ehdr Elf64_Ehdr
+#define Elf_Phdr Elf64_Phdr
+#define Elf_Shdr Elf64_Shdr
+#define Elf_Nhdr Elf64_Nhdr
+#endif
+
 #ifndef NT_FILE
 #define NT_FILE 0x46494c45
 #endif
@@ -329,6 +357,11 @@ extern void gcore_default_regsets_init(void);
 #define REGSET_VIEW_MACHINE EM_PPC64
 #endif
 
+#ifdef RISCV64
+#define REGSET_VIEW_NAME "riscv64"
+#define REGSET_VIEW_MACHINE EM_RISCV
+#endif
+
 extern int gcore_arch_get_fp_valid(struct task_context *tc);
 
 /*
@@ -669,7 +702,13 @@ struct user_regs_struct {
 };
 #endif
 
-#if defined(X86) || defined(X86_64) || defined(ARM) || defined(MIPS)
+#ifdef RISCV64
+struct user_regs_struct {
+	unsigned long gregs[32];
+};
+#endif
+
+#if defined(X86) || defined(X86_64) || defined(ARM) || defined(MIPS) || defined(RISCV64)
 typedef ulong elf_greg_t;
 #define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))
 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
@@ -678,7 +717,7 @@ typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 #if defined(X86) || defined(ARM) || defined(MIPS)
 #define PAGE_SIZE 4096
 #endif
-#if defined(ARM64) || defined(PPC64)
+#if defined(ARM64) || defined(PPC64) || defined(RISCV64)
 #define PAGE_SIZE PAGESIZE()
 #endif
 
@@ -837,12 +876,12 @@ typedef unsigned short __kernel_old_uid_t;
 typedef unsigned short __kernel_old_gid_t;
 #endif
 
-#if defined(X86_64) || defined(ARM64) || defined(PPC64)
+#if defined(X86_64) || defined(ARM64) || defined(PPC64) || defined(RISCV64)
 typedef unsigned int __kernel_uid_t;
 typedef unsigned int __kernel_gid_t;
 #endif
 
-#ifdef ARM64
+#if defined(ARM64) || defined(RISCV64) 
 #ifndef __kernel_old_uid_t
 typedef __kernel_uid_t  __kernel_old_uid_t;
 typedef __kernel_gid_t  __kernel_old_gid_t;
diff --git a/src/libgcore/gcore_riscv64.c b/src/libgcore/gcore_riscv64.c
new file mode 100644
index 0000000..7578cdf
--- /dev/null
+++ b/src/libgcore/gcore_riscv64.c
@@ -0,0 +1,91 @@
+/* gcore_riscv64.c
+ *
+ * Copyright (C) 2014 Red Hat, Inc. All rights reserved
+ *
+ * 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.
+ */
+
+#ifdef RISCV64
+
+#include "defs.h"
+#include <gcore_defs.h>
+#include <stdint.h>
+#include <elf.h>
+
+static int gpr_get(struct task_context *target,
+                   const struct user_regset *regset,
+                   unsigned int size, void *buf)
+{
+	struct user_regs_struct *regs = (struct user_regs_struct *)buf;
+
+	BZERO(regs, sizeof(*regs));
+
+	readmem(machdep->get_stacktop(target->task) - 
+		SIZE(pt_regs), KVADDR,
+		regs, SIZE(pt_regs), "gpr_get: pt_regs",
+		gcore_verbose_error_handle());
+
+	return 0;
+}
+
+enum gcore_regset {
+	REGSET_GPR,
+};
+
+static struct user_regset riscv64_regsets[] = {
+	[REGSET_GPR] = {
+		.core_note_type = NT_PRSTATUS,
+		.name = "CORE",
+		.size = ELF_NGREG * sizeof(unsigned int),
+		.get = gpr_get,
+	},
+};
+
+static const struct user_regset_view riscv64_regset_view = {
+	.name = "riscv64",
+	.regsets = riscv64_regsets,
+	.n = 1,
+	.e_machine = EM_RISCV,
+};
+
+const struct user_regset_view *
+task_user_regset_view(void)
+{
+	return &riscv64_regset_view;
+}
+
+int gcore_is_arch_32bit_emulation(struct task_context *tc)
+{
+	return FALSE;
+}
+
+/**
+ * Return an address to gate_vma.
+ */
+ulong gcore_arch_get_gate_vma(void)
+{
+	if (!symbol_exists("gate_vma"))
+		return 0UL;
+
+	return symbol_value("gate_vma");
+}
+
+char *gcore_arch_vma_name(ulong vma)
+{
+	return NULL;
+}
+
+int gcore_arch_vsyscall_has_vm_alwaysdump_flag(void)
+{
+	return FALSE;
+}
+
+#endif
-- 
2.25.1