[PULL 19/39] linux-user: Split out target_mmap__locked

[Richard Henderson <richard.henderson@linaro.org>]

All "goto fail" may be transformed to "return -1".

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Helge Deller <deller@gmx.de>
Message-Id: <20240102015808.132373-17-richard.henderson@linaro.org>
---
 linux-user/mmap.c | 62 ++++++++++++++++++++++++++---------------------
 1 file changed, 35 insertions(+), 27 deletions(-)

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index d11f758d07..b4c3cc65aa 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -490,9 +490,9 @@ abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size, abi_ulong align)
     }
 }
 
-/* NOTE: all the constants are the HOST ones */
-abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
-                     int flags, int fd, off_t offset)
+static abi_long target_mmap__locked(abi_ulong start, abi_ulong len,
+                                    int target_prot, int flags,
+                                    int fd, off_t offset)
 {
     int host_page_size = qemu_real_host_page_size();
     abi_ulong ret, last, real_start, real_last, retaddr, host_len;
@@ -500,30 +500,27 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
     int page_flags;
     off_t host_offset;
 
-    mmap_lock();
-    trace_target_mmap(start, len, target_prot, flags, fd, offset);
-
     if (!len) {
         errno = EINVAL;
-        goto fail;
+        return -1;
     }
 
     page_flags = validate_prot_to_pageflags(target_prot);
     if (!page_flags) {
         errno = EINVAL;
-        goto fail;
+        return -1;
     }
 
     /* Also check for overflows... */
     len = TARGET_PAGE_ALIGN(len);
     if (!len) {
         errno = ENOMEM;
-        goto fail;
+        return -1;
     }
 
     if (offset & ~TARGET_PAGE_MASK) {
         errno = EINVAL;
-        goto fail;
+        return -1;
     }
 
     /*
@@ -553,7 +550,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
         start = mmap_find_vma(real_start, host_len, TARGET_PAGE_SIZE);
         if (start == (abi_ulong)-1) {
             errno = ENOMEM;
-            goto fail;
+            return -1;
         }
     }
 
@@ -574,7 +571,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
         struct stat sb;
 
         if (fstat(fd, &sb) == -1) {
-            goto fail;
+            return -1;
         }
 
         /* Are we trying to create a map beyond EOF?.  */
@@ -601,7 +598,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
         p = mmap(g2h_untagged(start), host_len, host_prot,
                  flags | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
         if (p == MAP_FAILED) {
-            goto fail;
+            return -1;
         }
         /* update start so that it points to the file position at 'offset' */
         host_start = (uintptr_t)p;
@@ -610,7 +607,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
                      flags | MAP_FIXED, fd, host_offset);
             if (p == MAP_FAILED) {
                 munmap(g2h_untagged(start), host_len);
-                goto fail;
+                return -1;
             }
             host_start += offset - host_offset;
         }
@@ -621,7 +618,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
     } else {
         if (start & ~TARGET_PAGE_MASK) {
             errno = EINVAL;
-            goto fail;
+            return -1;
         }
         last = start + len - 1;
         real_last = ROUND_UP(last, host_page_size) - 1;
@@ -633,14 +630,14 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
          */
         if (last < start || !guest_range_valid_untagged(start, len)) {
             errno = ENOMEM;
-            goto fail;
+            return -1;
         }
 
         if (flags & MAP_FIXED_NOREPLACE) {
             /* Validate that the chosen range is empty. */
             if (!page_check_range_empty(start, last)) {
                 errno = EEXIST;
-                goto fail;
+                return -1;
             }
 
             /*
@@ -671,17 +668,17 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
             if ((flags & MAP_TYPE) == MAP_SHARED
                 && (target_prot & PROT_WRITE)) {
                 errno = EINVAL;
-                goto fail;
+                return -1;
             }
             retaddr = target_mmap(start, len, target_prot | PROT_WRITE,
                                   (flags & (MAP_FIXED | MAP_FIXED_NOREPLACE))
                                   | MAP_PRIVATE | MAP_ANONYMOUS,
                                   -1, 0);
             if (retaddr == -1) {
-                goto fail;
+                return -1;
             }
             if (pread(fd, g2h_untagged(start), len, offset) == -1) {
-                goto fail;
+                return -1;
             }
             if (!(target_prot & PROT_WRITE)) {
                 ret = target_mprotect(start, len, target_prot);
@@ -696,14 +693,14 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
                 /* one single host page */
                 if (!mmap_frag(real_start, start, last,
                                target_prot, flags, fd, offset)) {
-                    goto fail;
+                    return -1;
                 }
                 goto the_end1;
             }
             if (!mmap_frag(real_start, start,
                            real_start + host_page_size - 1,
                            target_prot, flags, fd, offset)) {
-                goto fail;
+                return -1;
             }
             real_start += host_page_size;
         }
@@ -713,7 +710,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
             if (!mmap_frag(real_page, real_page, last,
                            target_prot, flags, fd,
                            offset + real_page - start)) {
-                goto fail;
+                return -1;
             }
             real_last -= host_page_size;
         }
@@ -739,7 +736,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
                     munmap(p, len1);
                     errno = EEXIST;
                 }
-                goto fail;
+                return -1;
             }
             passthrough_start = real_start;
             passthrough_last = real_last;
@@ -773,11 +770,22 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
             qemu_log_unlock(f);
         }
     }
-    mmap_unlock();
     return start;
-fail:
+}
+
+/* NOTE: all the constants are the HOST ones */
+abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
+                     int flags, int fd, off_t offset)
+{
+    abi_long ret;
+
+    trace_target_mmap(start, len, target_prot, flags, fd, offset);
+    mmap_lock();
+
+    ret = target_mmap__locked(start, len, target_prot, flags, fd, offset);
+
     mmap_unlock();
-    return -1;
+    return ret;
 }
 
 static int mmap_reserve_or_unmap(abi_ulong start, abi_ulong len)
-- 
2.34.1