linux-user: Split out mmap_end

Use a subroutine instead of a goto within target_mmap__locked.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-20-richard.henderson@linaro.org>

linux-user/mmap.c

@@ -490,6 +490,43 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align)
     }
 }
 
+/*
+ * Record a successful mmap within the user-exec interval tree.
+ */
+static abi_long mmap_end(abi_ulong start, abi_ulong last,
+                         abi_ulong passthrough_start,
+                         abi_ulong passthrough_last,
+                         int flags, int page_flags)
+{
+    if (flags & MAP_ANONYMOUS) {
+        page_flags |= PAGE_ANON;
+    }
+    page_flags |= PAGE_RESET;
+    if (passthrough_start > passthrough_last) {
+        page_set_flags(start, last, page_flags);
+    } else {
+        if (start < passthrough_start) {
+            page_set_flags(start, passthrough_start - 1, page_flags);
+        }
+        page_set_flags(passthrough_start, passthrough_last,
+                       page_flags | PAGE_PASSTHROUGH);
+        if (passthrough_last < last) {
+            page_set_flags(passthrough_last + 1, last, page_flags);
+        }
+    }
+    shm_region_rm_complete(start, last);
+    trace_target_mmap_complete(start);
+    if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
+        FILE *f = qemu_log_trylock();
+        if (f) {
+            fprintf(f, "page layout changed following mmap\n");
+            page_dump(f);
+            qemu_log_unlock(f);
+        }
+    }
+    return start;
+}
+
 static abi_long target_mmap__locked(abi_ulong start, abi_ulong len,
                                     int target_prot, int flags, int page_flags,
                                     int fd, off_t offset)
@@ -632,7 +669,7 @@ static abi_long target_mmap__locked(abi_ulong start, abi_ulong len,
                 ret = target_mprotect(start, len, target_prot);
                 assert(ret == 0);
             }
-            goto the_end;
+            return mmap_end(start, last, -1, 0, flags, page_flags);
         }
 
         /* handle the start of the mapping */
@@ -643,7 +680,7 @@ static abi_long target_mmap__locked(abi_ulong start, abi_ulong len,
                                target_prot, flags, fd, offset)) {
                     return -1;
                 }
-                goto the_end;
+                return mmap_end(start, last, -1, 0, flags, page_flags);
             }
             if (!mmap_frag(real_start, start,
                            real_start + host_page_size - 1,
@@ -690,34 +727,8 @@ static abi_long target_mmap__locked(abi_ulong start, abi_ulong len,
             passthrough_last = real_last;
         }
     }
- the_end:
-    if (flags & MAP_ANONYMOUS) {
-        page_flags |= PAGE_ANON;
-    }
-    page_flags |= PAGE_RESET;
-    if (passthrough_start > passthrough_last) {
-        page_set_flags(start, last, page_flags);
-    } else {
-        if (start < passthrough_start) {
-            page_set_flags(start, passthrough_start - 1, page_flags);
-        }
-        page_set_flags(passthrough_start, passthrough_last,
-                       page_flags | PAGE_PASSTHROUGH);
-        if (passthrough_last < last) {
-            page_set_flags(passthrough_last + 1, last, page_flags);
-        }
-    }
-    shm_region_rm_complete(start, last);
-    trace_target_mmap_complete(start);
-    if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
-        FILE *f = qemu_log_trylock();
-        if (f) {
-            fprintf(f, "page layout changed following mmap\n");
-            page_dump(f);
-            qemu_log_unlock(f);
-        }
-    }
-    return start;
+    return mmap_end(start, last, passthrough_start, passthrough_last,
+                    flags, page_flags);
 }
 
 /* NOTE: all the constants are the HOST ones */