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Taken from https://github.com/nelhage/reptyr/commit/e26724cc1ae5fe7af0c9fb6369f6cf09d1d12900
From ae0b4ec014c1a01b1c3409e5404cf0fa0102c349 Mon Sep 17 00:00:00 2001
From: Ast-x64 <Ast-x64@protonmail.com>
Date: Wed, 10 Nov 2021 09:39:45 +0800
Subject: [PATCH] Support riscv64 on Linux.
---
platform/linux/arch/riscv64.h | 68 +++++++++++++++++++++++++++++++++++
platform/linux/linux_ptrace.c | 2 ++
ptrace.h | 3 ++
3 files changed, 73 insertions(+)
create mode 100644 platform/linux/arch/riscv64.h
diff --git a/platform/linux/arch/riscv64.h b/platform/linux/arch/riscv64.h
new file mode 100644
index 0000000..96221c3
--- /dev/null
+++ b/platform/linux/arch/riscv64.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2021 by Ast-x64
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+static struct ptrace_personality arch_personality[1] = {
+ {
+ offsetof(struct user_regs_struct, a0),
+ offsetof(struct user_regs_struct, a0),
+ offsetof(struct user_regs_struct, a1),
+ offsetof(struct user_regs_struct, a2),
+ offsetof(struct user_regs_struct, a3),
+ offsetof(struct user_regs_struct, a4),
+ offsetof(struct user_regs_struct, a5),
+ offsetof(struct user_regs_struct, pc),
+ }
+};
+
+static inline void arch_fixup_regs(struct ptrace_child *child) {
+ child->regs.pc -= 4;
+}
+
+static inline int arch_set_syscall(struct ptrace_child *child,
+ unsigned long sysno) {
+ unsigned long x_reg[18];
+ struct iovec reg_iovec = {
+ .iov_base = x_reg,
+ .iov_len = sizeof(x_reg)
+ };
+ if (ptrace_command(child, PTRACE_GETREGSET, NT_PRSTATUS, ®_iovec) < 0)
+ return -1;
+
+ x_reg[17] = sysno;
+ return ptrace_command(child, PTRACE_SETREGSET, NT_PRSTATUS, ®_iovec);
+}
+
+static inline int arch_save_syscall(struct ptrace_child *child) {
+ unsigned long x_reg[18];
+ struct iovec reg_iovec = {
+ .iov_base = x_reg,
+ .iov_len = sizeof(x_reg)
+ };
+ if (ptrace_command(child, PTRACE_GETREGSET, NT_PRSTATUS, ®_iovec) < 0)
+ return -1;
+
+ child->saved_syscall = x_reg[17];
+ return 0;
+}
+
+static inline int arch_restore_syscall(struct ptrace_child *child) {
+ return arch_set_syscall(child, child->saved_syscall);
+}
diff --git a/platform/linux/linux_ptrace.c b/platform/linux/linux_ptrace.c
index d065199..bcbe600 100644
--- a/platform/linux/linux_ptrace.c
+++ b/platform/linux/linux_ptrace.c
@@ -84,6 +84,8 @@ static struct ptrace_personality *personality(struct ptrace_child *child);
#include "arch/aarch64.h"
#elif defined(__powerpc__)
#include "arch/powerpc.h"
+#elif defined(__riscv) && __riscv_xlen == 64
+#include "arch/riscv64.h"
#else
#error Unsupported architecture.
#endif
diff --git a/ptrace.h b/ptrace.h
index ee05bd7..8e3a7f4 100644
--- a/ptrace.h
+++ b/ptrace.h
@@ -25,6 +25,9 @@
#ifdef __powerpc__
#include <asm/ptrace.h>
#endif
+#ifdef __riscv
+#include <asm/ptrace.h>
+#endif
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/user.h>
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