bsd-user: Implement RISC-V TLS register setup

Included the prototype for the 'target_cpu_set_tls' function in the
'target_arch.h' header file. This function is responsible for setting
the Thread Local Storage (TLS) register for RISC-V architecture.

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240916155119.14610-5-itachis@FreeBSD.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

2 files changed, 56 insertions, 0 deletions

diff --git a/bsd-user/riscv/target_arch.h b/bsd-user/riscv/target_arch.h
new file mode 100644
index 0000000..26ce07f
--- /dev/null
+++ b/bsd-user/riscv/target_arch.h
@@ -0,0 +1,27 @@
+/*
+ * RISC-V specific prototypes
+ *
+ * Copyright (c) 2019 Mark Corbin <mark.corbin@embecsom.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef TARGET_ARCH_H
+#define TARGET_ARCH_H
+
+#include "qemu.h"
+
+void target_cpu_set_tls(CPURISCVState *env, target_ulong newtls);
+
+#endif /* TARGET_ARCH_H */
diff --git a/bsd-user/riscv/target_arch_cpu.c b/bsd-user/riscv/target_arch_cpu.c
new file mode 100644
index 0000000..44e25d2
--- /dev/null
+++ b/bsd-user/riscv/target_arch_cpu.c
@@ -0,0 +1,29 @@
+/*
+ *  RISC-V CPU related code
+ *
+ *  Copyright (c) 2019 Mark Corbin
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "qemu/osdep.h"
+
+#include "target_arch.h"
+
+#define TP_OFFSET       16
+
+/* Compare with cpu_set_user_tls() in riscv/riscv/vm_machdep.c */
+void target_cpu_set_tls(CPURISCVState *env, target_ulong newtls)
+{
+    env->gpr[xTP] = newtls + TP_OFFSET;
+}