[SPARC]: Fix dot-symbol exporting for good.

From: Al Viro <[e-mail]>

Instead of playing all of these hand-coded assembler aliasing games,
just translate symbol names in the name space ".sym" to "_Sym" at
module load time.

Signed-off-by: David S. Miller <[e-mail]>

arch/sparc/kernel/module.c

···
 #include <linux/vmalloc.h>
 #include <linux/fs.h>
 #include <linux/string.h>
+#include <linux/ctype.h>
 
 void *module_alloc(unsigned long size)
 {
···
 }
 
 /* Make generic code ignore STT_REGISTER dummy undefined symbols,
- * and replace references to .func with func as in ppc64's dedotify.
+ * and replace references to .func with _Func
  */
 int module_frob_arch_sections(Elf_Ehdr *hdr,
 			      Elf_Shdr *sechdrs,
···
 				sym[i].st_shndx = SHN_ABS;
 			else {
 				char *name = strtab + sym[i].st_name;
-				if (name[0] == '.')
-					memmove(name, name+1, strlen(name));
+				if (name[0] == '.') {
+					name[0] = '_';
+					name[1] = toupper(name[1]);
+				}
 			}
 		}
 	}

arch/sparc/kernel/sparc_ksyms.c

···
 /* Alias functions whose names begin with "." and export the aliases.
  * The module references will be fixed up by module_frob_arch_sections.
  */
-#define DOT_ALIAS2(__ret, __x, __arg1, __arg2) \
-	extern __ret __x(__arg1, __arg2); \
-	asm(".weak " #__x);\
-	asm(#__x "=." #__x);
-
-DOT_ALIAS2(int, div, int, int)
-DOT_ALIAS2(int, mul, int, int)
-DOT_ALIAS2(int, rem, int, int)
-DOT_ALIAS2(unsigned, udiv, unsigned, unsigned)
-DOT_ALIAS2(unsigned, umul, unsigned, unsigned)
-DOT_ALIAS2(unsigned, urem, unsigned, unsigned)
-
-#undef DOT_ALIAS2
+extern int _Div(int, int);
+extern int _Mul(int, int);
+extern int _Rem(int, int);
+extern unsigned _Udiv(unsigned, unsigned);
+extern unsigned _Umul(unsigned, unsigned);
+extern unsigned _Urem(unsigned, unsigned);
 
 /* used by various drivers */
 EXPORT_SYMBOL(sparc_cpu_model);
···
 EXPORT_SYMBOL(__muldi3);
 EXPORT_SYMBOL(__divdi3);
 
-EXPORT_SYMBOL(rem);
-EXPORT_SYMBOL(urem);
-EXPORT_SYMBOL(mul);
-EXPORT_SYMBOL(umul);
-EXPORT_SYMBOL(div);
-EXPORT_SYMBOL(udiv);
+EXPORT_SYMBOL(_Rem);
+EXPORT_SYMBOL(_Urem);
+EXPORT_SYMBOL(_Mul);
+EXPORT_SYMBOL(_Umul);
+EXPORT_SYMBOL(_Div);
+EXPORT_SYMBOL(_Udiv);
 
 #ifdef CONFIG_DEBUG_BUGVERBOSE
 EXPORT_SYMBOL(do_BUG);

arch/sparc/lib/mul.S

···
  */
 
 	.globl .mul
+	.globl _Mul
 .mul:
+_Mul:	/* needed for export */
 	mov	%o0, %y		! multiplier -> Y
 	andncc	%o0, 0xfff, %g0	! test bits 12..31
 	be	Lmul_shortway	! if zero, can do it the short way

arch/sparc/lib/rem.S

···
 
 
 	.globl .rem
+	.globl _Rem
 .rem:
+_Rem:	/* needed for export */
 	! compute sign of result; if neither is negative, no problem
 	orcc	%o1, %o0, %g0	! either negative?
 	bge	2f			! no, go do the divide

arch/sparc/lib/sdiv.S

···
 
 
 	.globl .div
+	.globl _Div
 .div:
+_Div:	/* needed for export */
 	! compute sign of result; if neither is negative, no problem
 	orcc	%o1, %o0, %g0	! either negative?
 	bge	2f			! no, go do the divide

arch/sparc/lib/udiv.S

···
 
 
 	.globl .udiv
+	.globl _Udiv
 .udiv:
+_Udiv:	/* needed for export */
 
 	! Ready to divide.  Compute size of quotient; scale comparand.
 	orcc	%o1, %g0, %o5

arch/sparc/lib/umul.S

···
  */
 
 	.globl .umul
+	.globl _Umul
 .umul:
+_Umul:	/* needed for export */
 	or	%o0, %o1, %o4
 	mov	%o0, %y		! multiplier -> Y
 

arch/sparc/lib/urem.S

···
  */
 
 	.globl .urem
+	.globl _Urem
 .urem:
+_Urem:	/* needed for export */
 
 	! Ready to divide.  Compute size of quotient; scale comparand.
 	orcc	%o1, %g0, %o5

scripts/mod/modpost.c

···
 			/* Ignore register directives. */
 			if (ELF_ST_TYPE(sym->st_info) == STT_SPARC_REGISTER)
 				break;
+ 			if (symname[0] == '.') {
+ 				char *munged = strdup(symname);
+ 				munged[0] = '_';
+ 				munged[1] = toupper(munged[1]);
+ 				symname = munged;
+ 			}
 		}
 #endif