bsd-user: Define RISC-V signal handling structures and constants

Added definitions for RISC-V signal handling, including structures
and constants for managing signal frames and context

Signed-off-by: Mark Corbin <mark@dibsco.co.uk>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Co-authored-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240916155119.14610-14-itachis@FreeBSD.org>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

diff --git a/bsd-user/riscv/target_arch_signal.h b/bsd-user/riscv/target_arch_signal.h
new file mode 100644 (file)
index 0000000..1a634b8
--- /dev/null
+++ b/bsd-user/riscv/target_arch_signal.h
@@ -0,0 +1,75 @@
+/*
+ *  RISC-V signal definitions
+ *
+ *  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/>.
+ */
+
+#ifndef TARGET_ARCH_SIGNAL_H
+#define TARGET_ARCH_SIGNAL_H
+
+#include "cpu.h"
+
+
+#define TARGET_INSN_SIZE     4  /* riscv instruction size */
+
+/* Size of the signal trampoline code placed on the stack. */
+#define TARGET_SZSIGCODE    ((abi_ulong)(7 * TARGET_INSN_SIZE))
+
+/* Compare with riscv/include/_limits.h */
+#define TARGET_MINSIGSTKSZ  (1024 * 4)
+#define TARGET_SIGSTKSZ     (TARGET_MINSIGSTKSZ + 32768)
+
+struct target_gpregs {
+    uint64_t    gp_ra;
+    uint64_t    gp_sp;
+    uint64_t    gp_gp;
+    uint64_t    gp_tp;
+    uint64_t    gp_t[7];
+    uint64_t    gp_s[12];
+    uint64_t    gp_a[8];
+    uint64_t    gp_sepc;
+    uint64_t    gp_sstatus;
+};
+
+struct target_fpregs {
+    uint64_t        fp_x[32][2];
+    uint64_t        fp_fcsr;
+    uint32_t        fp_flags;
+    uint32_t        pad;
+};
+
+typedef struct target_mcontext {
+    struct target_gpregs   mc_gpregs;
+    struct target_fpregs   mc_fpregs;
+    uint32_t               mc_flags;
+#define TARGET_MC_FP_VALID 0x01
+    uint32_t               mc_pad;
+    uint64_t               mc_spare[8];
+} target_mcontext_t;
+
+#define TARGET_MCONTEXT_SIZE 864
+#define TARGET_UCONTEXT_SIZE 936
+
+#include "target_os_ucontext.h"
+
+struct target_sigframe {
+    target_ucontext_t   sf_uc; /* = *sf_uncontext */
+    target_siginfo_t    sf_si; /* = *sf_siginfo (SA_SIGINFO case)*/
+};
+
+#define TARGET_SIGSTACK_ALIGN 16
+
+#endif /* TARGET_ARCH_SIGNAL_H */