[PATCH] ntdll: Improve portability of call_constructor (and port to FreeBSD)
Gerald Pfeifer
gerald at pfeifer.com
Sun Apr 19 03:43:44 CDT 2020
The new function call_constructors in dlls/ntdll/loader.c introduced via
081c8e1c73bb8d79a060da7816b5c429180b35b7
Author: Alexandre Julliard <julliard at winehq.org>
Date: Thu Apr 16 12:22:24 2020 +0200
ntdll: Execute .so constructors during module initialization.
breaks the build on FreeBSD and presumably others. Specifically,
struct link_map *map;
:
if (dlinfo( wm->so_handle, RTLD_DI_LINKMAP, &map ) == -1) return;
while (map->l_ld->d_tag)
:
fails to compile:
loader.c: In function ‘call_constructors’:
loader.c:1329:21: warning: dereferencing ‘void *’ pointer
1329 | while (map->l_ld->d_tag)
| ^~
loader.c:1329:21: error: request for member ‘d_tag’ in something not a
structure or union
This is due to /usr/include/link.h (via /usr/include/sys/link_elf.h)
defining link_map.l_ld as a void* as opposed to a more specific type
like on Linux:
typedef struct link_map {
caddr_t l_addr; /* Base Address of library */
#ifdef __mips__
caddr_t l_offs; /* Load Offset of library */
#endif
const char *l_name; /* Absolute Path to Library */
const void *l_ld; /* Pointer to .dynamic in memory */
struct link_map *l_next, *l_prev; /* linked list of of mapped libs */
} Link_map;
Luckily FreeBSD does feature Elf64_Dyn and Elf32_Dyn which do match their
Linux equivalents, so introducing a new variable holding a pointer to one
of those and using implicit type conversions with void* addresses this.
If further platforms require similar adjustments, this should now be a
question of extending one condition or adding two lines.
Gerald
Signed-off-by: Gerald Pfeifer <gerald at pfeifer.com>
---
dlls/ntdll/loader.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/dlls/ntdll/loader.c b/dlls/ntdll/loader.c
index c713a5d0a6..e9140145e1 100644
--- a/dlls/ntdll/loader.c
+++ b/dlls/ntdll/loader.c
@@ -1324,17 +1324,25 @@ static void call_constructors( WINE_MODREF *wm )
void (*init_func)(int, char **, char **) = NULL;
void (**init_array)(int, char **, char **) = NULL;
ULONG_PTR i, init_arraysz = 0;
+#if defined (__FreeBSD__) && defined (__LP64__)
+ const Elf64_Dyn *l_ld;
+#elif defined (__FreeBSD__)
+ const Elf32_Dyn *l_ld;
+#else
+ const ElfW(Dyn) *l_ld;
+#endif
if (dlinfo( wm->so_handle, RTLD_DI_LINKMAP, &map ) == -1) return;
- while (map->l_ld->d_tag)
+ l_ld = map->l_ld;
+ while (l_ld->d_tag)
{
- switch (map->l_ld->d_tag)
+ switch (l_ld->d_tag)
{
- case 0x60009990: init_array = (void *)((char *)map->l_addr + map->l_ld->d_un.d_val); break;
- case 0x60009991: init_arraysz = map->l_ld->d_un.d_val; break;
- case 0x60009992: init_func = (void *)((char *)map->l_addr + map->l_ld->d_un.d_val); break;
+ case 0x60009990: init_array = (void *)((char *)map->l_addr + l_ld->d_un.d_val); break;
+ case 0x60009991: init_arraysz = l_ld->d_un.d_val; break;
+ case 0x60009992: init_func = (void *)((char *)map->l_addr + l_ld->d_un.d_val); break;
}
- map->l_ld++;
+ l_ld++;
}
TRACE( "%s: got init_func %p init_array %p %lu\n", debugstr_us( &wm->ldr.BaseDllName ),
--
2.25.0
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