semihosting: Move exec/softmmu-semi.h to semihosting/softmmu-uaccess.h

We have a subdirectory for semihosting; move this file out of exec.
Rename to emphasize the contents are a replacement for the functions
in linux-user/bsd-user uaccess.c.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/semihosting/softmmu-uaccess.h

@@ -0,0 +1,101 @@
+/*
+ * Helper routines to provide target memory access for semihosting
+ * syscalls in system emulation mode.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ *
+ * This code is licensed under the GPL
+ */
+
+#ifndef SEMIHOSTING_SOFTMMU_UACCESS_H
+#define SEMIHOSTING_SOFTMMU_UACCESS_H
+
+#include "cpu.h"
+
+static inline uint64_t softmmu_tget64(CPUArchState *env, target_ulong addr)
+{
+    uint64_t val;
+
+    cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 8, 0);
+    return tswap64(val);
+}
+
+static inline uint32_t softmmu_tget32(CPUArchState *env, target_ulong addr)
+{
+    uint32_t val;
+
+    cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 4, 0);
+    return tswap32(val);
+}
+
+static inline uint32_t softmmu_tget8(CPUArchState *env, target_ulong addr)
+{
+    uint8_t val;
+
+    cpu_memory_rw_debug(env_cpu(env), addr, &val, 1, 0);
+    return val;
+}
+
+#define get_user_u64(arg, p) ({ arg = softmmu_tget64(env, p); 0; })
+#define get_user_u32(arg, p) ({ arg = softmmu_tget32(env, p) ; 0; })
+#define get_user_u8(arg, p) ({ arg = softmmu_tget8(env, p) ; 0; })
+#define get_user_ual(arg, p) get_user_u32(arg, p)
+
+static inline void softmmu_tput64(CPUArchState *env,
+                                  target_ulong addr, uint64_t val)
+{
+    val = tswap64(val);
+    cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 8, 1);
+}
+
+static inline void softmmu_tput32(CPUArchState *env,
+                                  target_ulong addr, uint32_t val)
+{
+    val = tswap32(val);
+    cpu_memory_rw_debug(env_cpu(env), addr, (uint8_t *)&val, 4, 1);
+}
+#define put_user_u64(arg, p) ({ softmmu_tput64(env, p, arg) ; 0; })
+#define put_user_u32(arg, p) ({ softmmu_tput32(env, p, arg) ; 0; })
+#define put_user_ual(arg, p) put_user_u32(arg, p)
+
+static void *softmmu_lock_user(CPUArchState *env,
+                               target_ulong addr, target_ulong len, int copy)
+{
+    uint8_t *p;
+    /* TODO: Make this something that isn't fixed size.  */
+    p = malloc(len);
+    if (p && copy) {
+        cpu_memory_rw_debug(env_cpu(env), addr, p, len, 0);
+    }
+    return p;
+}
+#define lock_user(type, p, len, copy) softmmu_lock_user(env, p, len, copy)
+static char *softmmu_lock_user_string(CPUArchState *env, target_ulong addr)
+{
+    char *p;
+    char *s;
+    uint8_t c;
+    /* TODO: Make this something that isn't fixed size.  */
+    s = p = malloc(1024);
+    if (!s) {
+        return NULL;
+    }
+    do {
+        cpu_memory_rw_debug(env_cpu(env), addr, &c, 1, 0);
+        addr++;
+        *(p++) = c;
+    } while (c);
+    return s;
+}
+#define lock_user_string(p) softmmu_lock_user_string(env, p)
+static void softmmu_unlock_user(CPUArchState *env, void *p, target_ulong addr,
+                                target_ulong len)
+{
+    if (len) {
+        cpu_memory_rw_debug(env_cpu(env), addr, p, len, 1);
+    }
+    free(p);
+}
+#define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len)
+
+#endif /* SEMIHOSTING_SOFTMMU_UACCESS_H */