mod/file2alias: make modpost compile on darwin again
Andreas Bießmann [Fri, 24 Feb 2012 07:23:53 +0000 (08:23 +0100)]
commit e49ce14150c64b29a8dd211df785576fa19a9858 breaks cross compiling
the linux kernel on darwin hosts.
This fix introduce some minimal glue to adopt linker section handling
for darwin hosts.

Signed-off-by: Andreas Bießmann <andreas@biessmann.de>
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Jochen Friedrich <jochen@scram.de>
CC: Samuel Ortiz <sameo@linux.intel.com>
CC: "K. Y. Srinivasan" <kys@microsoft.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Tested-by: Bernhard Walle <bernhard@bwalle.de>

scripts/mod/file2alias.c

index d0de2a2..b89efe6 100644 (file)
@@ -46,11 +46,37 @@ struct devtable {
        void *function;
 };
 
+#define ___cat(a,b) a ## b
+#define __cat(a,b) ___cat(a,b)
+
+/* we need some special handling for this host tool running eventually on
+ * Darwin. The Mach-O section handling is a bit different than ELF section
+ * handling. The differnces in detail are:
+ *  a) we have segments which have sections
+ *  b) we need a API call to get the respective section symbols */
+#if defined(__MACH__)
+#include <mach-o/getsect.h>
+
+#define INIT_SECTION(name)  do {                                       \
+               unsigned long name ## _len;                             \
+               char *__cat(pstart_,name) = getsectdata("__TEXT",       \
+                       #name, &__cat(name,_len));                      \
+               char *__cat(pstop_,name) = __cat(pstart_,name) +        \
+                       __cat(name, _len);                              \
+               __cat(__start_,name) = (void *)__cat(pstart_,name);     \
+               __cat(__stop_,name) = (void *)__cat(pstop_,name);       \
+       } while (0)
+#define SECTION(name)   __attribute__((section("__TEXT, " #name)))
+
+struct devtable **__start___devtable, **__stop___devtable;
+#else
+#define INIT_SECTION(name) /* no-op for ELF */
+#define SECTION(name)   __attribute__((section(#name)))
+
 /* We construct a table of pointers in an ELF section (pointers generally
  * go unpadded by gcc).  ld creates boundary syms for us. */
 extern struct devtable *__start___devtable[], *__stop___devtable[];
-#define ___cat(a,b) a ## b
-#define __cat(a,b) ___cat(a,b)
+#endif /* __MACH__ */
 
 #if __GNUC__ == 3 && __GNUC_MINOR__ < 3
 # define __used                        __attribute__((__unused__))
@@ -65,8 +91,8 @@ extern struct devtable *__start___devtable[], *__stop___devtable[];
                                                (type *)NULL,           \
                                                (char *)NULL)),         \
                sizeof(type), (function) };                             \
-       static struct devtable *__attribute__((section("__devtable"))) \
-               __used __cat(devtable_ptr,__LINE__) = &__cat(devtable,__LINE__)
+       static struct devtable *SECTION(__devtable) __used \
+               __cat(devtable_ptr,__LINE__) = &__cat(devtable,__LINE__)
 
 #define ADD(str, sep, cond, field)                              \
 do {                                                            \
@@ -1080,6 +1106,7 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
                do_pnp_card_entries(symval, sym->st_size, mod);
        else {
                struct devtable **p;
+               INIT_SECTION(__devtable);
 
                for (p = __start___devtable; p < __stop___devtable; p++) {
                        if (sym_is(name, namelen, (*p)->device_id)) {