From a30bfaa7bd1f721a5b936fd1b4bf009eb9c2a6f4 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Fri, 17 Sep 2021 10:34:42 -0700
Subject: [PATCH] linux-user/host/arm: Populate host_signal.h
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Split host_signal_pc and host_signal_write out of user-exec.c.
Drop the *BSD code, to be re-created under bsd-user/ later.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/user-exec.c             | 45 +------------------------------
 linux-user/host/arm/host-signal.h | 31 ++++++++++++++++++++-
 2 files changed, 31 insertions(+), 45 deletions(-)

diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index 694eff7f04..fabc8855a9 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -253,50 +253,7 @@ void *probe_access(CPUArchState *env, target_ulong addr, int size,
     return size ? g2h(env_cpu(env), addr) : NULL;
 }
 
-#if defined(__arm__)
-
-#if defined(__NetBSD__)
-#include <ucontext.h>
-#include <sys/siginfo.h>
-#endif
-
-int cpu_signal_handler(int host_signum, void *pinfo,
-                       void *puc)
-{
-    siginfo_t *info = pinfo;
-#if defined(__NetBSD__)
-    ucontext_t *uc = puc;
-    siginfo_t *si = pinfo;
-#else
-    ucontext_t *uc = puc;
-#endif
-    unsigned long pc;
-    uint32_t fsr;
-    int is_write;
-
-#if defined(__NetBSD__)
-    pc = uc->uc_mcontext.__gregs[_REG_R15];
-#elif defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
-    pc = uc->uc_mcontext.gregs[R15];
-#else
-    pc = uc->uc_mcontext.arm_pc;
-#endif
-
-#ifdef __NetBSD__
-    fsr = si->si_trap;
-#else
-    fsr = uc->uc_mcontext.error_code;
-#endif
-    /*
-     * In the FSR, bit 11 is WnR, assuming a v6 or
-     * later processor.  On v5 we will always report
-     * this as a read, which will fail later.
-     */
-    is_write = extract32(fsr, 11, 1);
-    return handle_cpu_signal(pc, info, is_write, &uc->uc_sigmask);
-}
-
-#elif defined(__aarch64__)
+#if defined(__aarch64__)
 
 #if defined(__NetBSD__)
 
diff --git a/linux-user/host/arm/host-signal.h b/linux-user/host/arm/host-signal.h
index f4b4d65031..efb165c0c5 100644
--- a/linux-user/host/arm/host-signal.h
+++ b/linux-user/host/arm/host-signal.h
@@ -1 +1,30 @@
-#define HOST_SIGNAL_PLACEHOLDER
+/*
+ * host-signal.h: signal info dependent on the host architecture
+ *
+ * Copyright (c) 2003-2005 Fabrice Bellard
+ * Copyright (c) 2021 Linaro Limited
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef ARM_HOST_SIGNAL_H
+#define ARM_HOST_SIGNAL_H
+
+static inline uintptr_t host_signal_pc(ucontext_t *uc)
+{
+    return uc->uc_mcontext.arm_pc;
+}
+
+static inline bool host_signal_write(siginfo_t *info, ucontext_t *uc)
+{
+    /*
+     * In the FSR, bit 11 is WnR, assuming a v6 or
+     * later processor.  On v5 we will always report
+     * this as a read, which will fail later.
+     */
+    uint32_t fsr = uc->uc_mcontext.error_code;
+    return extract32(fsr, 11, 1);
+}
+
+#endif