linux-user/host/x86: Populate host_signal.h

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>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

4 files changed, 51 insertions, 138 deletions

diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index b1183aa4b3..b121e6c2e9 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -29,19 +29,6 @@
 #include "trace/trace-root.h"
 #include "internal.h"
 
-#undef EAX
-#undef ECX
-#undef EDX
-#undef EBX
-#undef ESP
-#undef EBP
-#undef ESI
-#undef EDI
-#undef EIP
-#ifdef __linux__
-#include <sys/ucontext.h>
-#endif
-
 __thread uintptr_t helper_retaddr;
 
 //#define DEBUG_SIGNAL
@@ -266,123 +253,7 @@ void *probe_access(CPUArchState *env, target_ulong addr, int size,
     return size ? g2h(env_cpu(env), addr) : NULL;
 }
 
-#if defined(__i386__)
-
-#if defined(__NetBSD__)
-#include <ucontext.h>
-#include <machine/trap.h>
-
-#define EIP_sig(context)     ((context)->uc_mcontext.__gregs[_REG_EIP])
-#define TRAP_sig(context)    ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
-#define ERROR_sig(context)   ((context)->uc_mcontext.__gregs[_REG_ERR])
-#define MASK_sig(context)    ((context)->uc_sigmask)
-#define PAGE_FAULT_TRAP      T_PAGEFLT
-#elif defined(__FreeBSD__) || defined(__DragonFly__)
-#include <ucontext.h>
-#include <machine/trap.h>
-
-#define EIP_sig(context)  (*((unsigned long *)&(context)->uc_mcontext.mc_eip))
-#define TRAP_sig(context)    ((context)->uc_mcontext.mc_trapno)
-#define ERROR_sig(context)   ((context)->uc_mcontext.mc_err)
-#define MASK_sig(context)    ((context)->uc_sigmask)
-#define PAGE_FAULT_TRAP      T_PAGEFLT
-#elif defined(__OpenBSD__)
-#include <machine/trap.h>
-#define EIP_sig(context)     ((context)->sc_eip)
-#define TRAP_sig(context)    ((context)->sc_trapno)
-#define ERROR_sig(context)   ((context)->sc_err)
-#define MASK_sig(context)    ((context)->sc_mask)
-#define PAGE_FAULT_TRAP      T_PAGEFLT
-#else
-#define EIP_sig(context)     ((context)->uc_mcontext.gregs[REG_EIP])
-#define TRAP_sig(context)    ((context)->uc_mcontext.gregs[REG_TRAPNO])
-#define ERROR_sig(context)   ((context)->uc_mcontext.gregs[REG_ERR])
-#define MASK_sig(context)    ((context)->uc_sigmask)
-#define PAGE_FAULT_TRAP      0xe
-#endif
-
-int cpu_signal_handler(int host_signum, void *pinfo,
-                       void *puc)
-{
-    siginfo_t *info = pinfo;
-#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
-    ucontext_t *uc = puc;
-#elif defined(__OpenBSD__)
-    struct sigcontext *uc = puc;
-#else
-    ucontext_t *uc = puc;
-#endif
-    unsigned long pc;
-    int trapno;
-
-#ifndef REG_EIP
-/* for glibc 2.1 */
-#define REG_EIP    EIP
-#define REG_ERR    ERR
-#define REG_TRAPNO TRAPNO
-#endif
-    pc = EIP_sig(uc);
-    trapno = TRAP_sig(uc);
-    return handle_cpu_signal(pc, info,
-                             trapno == PAGE_FAULT_TRAP ?
-                             (ERROR_sig(uc) >> 1) & 1 : 0,
-                             &MASK_sig(uc));
-}
-
-#elif defined(__x86_64__)
-
-#ifdef __NetBSD__
-#include <machine/trap.h>
-#define PC_sig(context)       _UC_MACHINE_PC(context)
-#define TRAP_sig(context)     ((context)->uc_mcontext.__gregs[_REG_TRAPNO])
-#define ERROR_sig(context)    ((context)->uc_mcontext.__gregs[_REG_ERR])
-#define MASK_sig(context)     ((context)->uc_sigmask)
-#define PAGE_FAULT_TRAP       T_PAGEFLT
-#elif defined(__OpenBSD__)
-#include <machine/trap.h>
-#define PC_sig(context)       ((context)->sc_rip)
-#define TRAP_sig(context)     ((context)->sc_trapno)
-#define ERROR_sig(context)    ((context)->sc_err)
-#define MASK_sig(context)     ((context)->sc_mask)
-#define PAGE_FAULT_TRAP       T_PAGEFLT
-#elif defined(__FreeBSD__) || defined(__DragonFly__)
-#include <ucontext.h>
-#include <machine/trap.h>
-
-#define PC_sig(context)  (*((unsigned long *)&(context)->uc_mcontext.mc_rip))
-#define TRAP_sig(context)     ((context)->uc_mcontext.mc_trapno)
-#define ERROR_sig(context)    ((context)->uc_mcontext.mc_err)
-#define MASK_sig(context)     ((context)->uc_sigmask)
-#define PAGE_FAULT_TRAP       T_PAGEFLT
-#else
-#define PC_sig(context)       ((context)->uc_mcontext.gregs[REG_RIP])
-#define TRAP_sig(context)     ((context)->uc_mcontext.gregs[REG_TRAPNO])
-#define ERROR_sig(context)    ((context)->uc_mcontext.gregs[REG_ERR])
-#define MASK_sig(context)     ((context)->uc_sigmask)
-#define PAGE_FAULT_TRAP       0xe
-#endif
-
-int cpu_signal_handler(int host_signum, void *pinfo,
-                       void *puc)
-{
-    siginfo_t *info = pinfo;
-    unsigned long pc;
-#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
-    ucontext_t *uc = puc;
-#elif defined(__OpenBSD__)
-    struct sigcontext *uc = puc;
-#else
-    ucontext_t *uc = puc;
-#endif
-
-    pc = PC_sig(uc);
-    return handle_cpu_signal(pc, info,
-                             TRAP_sig(uc) == PAGE_FAULT_TRAP ?
-                             (ERROR_sig(uc) >> 1) & 1 : 0,
-                             &MASK_sig(uc));
-}
-
-#elif defined(_ARCH_PPC)
+#if defined(_ARCH_PPC)
 
 /***********************************************************************
  * signal context platform-specific definitions
@@ -893,11 +764,6 @@ int cpu_signal_handler(int host_signum, void *pinfo,
 
     return handle_cpu_signal(pc, info, is_write, &uc->uc_sigmask);
 }
-
-#else
-
-#error host CPU specific signal handler needed
-
 #endif
 
 /* The softmmu versions of these helpers are in cputlb.c.  */
diff --git a/linux-user/host/i386/host-signal.h b/linux-user/host/i386/host-signal.h
index f4b4d65031..4c8eef99ce 100644
--- a/linux-user/host/i386/host-signal.h
+++ b/linux-user/host/i386/host-signal.h
@@ -1 +1,25 @@
-#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 I386_HOST_SIGNAL_H
+#define I386_HOST_SIGNAL_H
+
+static inline uintptr_t host_signal_pc(ucontext_t *uc)
+{
+    return uc->uc_mcontext.gregs[REG_EIP];
+}
+
+static inline bool host_signal_write(siginfo_t *info, ucontext_t *uc)
+{
+    return uc->uc_mcontext.gregs[REG_TRAPNO] == 0xe
+        && (uc->uc_mcontext.gregs[REG_ERR] & 0x2);
+}
+
+#endif
diff --git a/linux-user/host/x32/host-signal.h b/linux-user/host/x32/host-signal.h
index f4b4d65031..26800591d3 100644
--- a/linux-user/host/x32/host-signal.h
+++ b/linux-user/host/x32/host-signal.h
@@ -1 +1 @@
-#define HOST_SIGNAL_PLACEHOLDER
+#include "../x86_64/host-signal.h"
diff --git a/linux-user/host/x86_64/host-signal.h b/linux-user/host/x86_64/host-signal.h
index f4b4d65031..883d2fcf65 100644
--- a/linux-user/host/x86_64/host-signal.h
+++ b/linux-user/host/x86_64/host-signal.h
@@ -1 +1,24 @@
-#define HOST_SIGNAL_PLACEHOLDER
+/*
+ * host-signal.h: signal info dependent on the host architecture
+ *
+ * Copyright (C) 2021 Linaro Limited
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef X86_64_HOST_SIGNAL_H
+#define X86_64_HOST_SIGNAL_H
+
+static inline uintptr_t host_signal_pc(ucontext_t *uc)
+{
+    return uc->uc_mcontext.gregs[REG_RIP];
+}
+
+static inline bool host_signal_write(siginfo_t *info, ucontext_t *uc)
+{
+    return uc->uc_mcontext.gregs[REG_TRAPNO] == 0xe
+        && (uc->uc_mcontext.gregs[REG_ERR] & 0x2);
+}
+
+#endif