bsd-user:Add ARM AArch64 signal handling support
Added sigcode setup function for signal trampoline which initializes a sequence of instructions
to handle signal returns and exits, copying this code to the target offset.
Defined ARM AArch64 specific signal definitions including register indices and sizes,
and introduced structures to represent general purpose registers, floating point registers, and machine context.
Added function to set up signal handler arguments, populating register values in `CPUARMState`
based on the provided signal, signal frame, signal action, and frame address.
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Co-authored-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240707191128.10509-5-itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
diff --git a/bsd-user/aarch64/target_arch_signal.h b/bsd-user/aarch64/target_arch_signal.h
new file mode 100644
index 0000000..df17173
--- /dev/null
+++ b/bsd-user/aarch64/target_arch_signal.h
@@ -0,0 +1,80 @@
+/*
+ * ARM AArch64 specific signal definitions for bsd-user
+ *
+ * Copyright (c) 2015 Stacey D. Son <sson at FreeBSD>
+ *
+ * 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_SIGNAL_H
+#define TARGET_ARCH_SIGNAL_H
+
+#include "cpu.h"
+
+#define TARGET_REG_X0 0
+#define TARGET_REG_X30 30
+#define TARGET_REG_X31 31
+#define TARGET_REG_LR TARGET_REG_X30
+#define TARGET_REG_SP TARGET_REG_X31
+
+#define TARGET_INSN_SIZE 4 /* arm64 instruction size */
+
+/* Size of the signal trampolin code. See _sigtramp(). */
+#define TARGET_SZSIGCODE ((abi_ulong)(9 * TARGET_INSN_SIZE))
+
+/* compare to sys/arm64/include/_limits.h */
+#define TARGET_MINSIGSTKSZ (1024 * 4) /* min sig stack size */
+#define TARGET_SIGSTKSZ (TARGET_MINSIGSTKSZ + 32768) /* recommended size */
+
+/* struct __mcontext in sys/arm64/include/ucontext.h */
+
+struct target_gpregs {
+ uint64_t gp_x[30];
+ uint64_t gp_lr;
+ uint64_t gp_sp;
+ uint64_t gp_elr;
+ uint32_t gp_spsr;
+ uint32_t gp_pad;
+};
+
+struct target_fpregs {
+ __uint128_t fp_q[32];
+ uint32_t fp_sr;
+ uint32_t fp_cr;
+ uint32_t fp_flags;
+ uint32_t fp_pad;
+};
+
+struct target__mcontext {
+ struct target_gpregs mc_gpregs;
+ struct target_fpregs mc_fpregs;
+ uint32_t mc_flags;
+#define TARGET_MC_FP_VALID 0x1
+ uint32_t mc_pad;
+ uint64_t mc_spare[8];
+};
+
+typedef struct target__mcontext target_mcontext_t;
+
+#define TARGET_MCONTEXT_SIZE 880
+#define TARGET_UCONTEXT_SIZE 960
+
+#include "target_os_ucontext.h"
+
+struct target_sigframe {
+ target_siginfo_t sf_si; /* saved siginfo */
+ target_ucontext_t sf_uc; /* saved ucontext */
+};
+
+#endif /* TARGET_ARCH_SIGNAL_H */
