add tlsdesc support for i386

arch/i386/reloc.h

@@ -26,6 +26,8 @@ static int remap_rel(int type)
 		return REL_TPOFF;
 	case R_386_TLS_TPOFF32:
 		return REL_TPOFF_NEG;
+	case R_386_TLS_DESC:
+		return REL_TLSDESC;
 	}
 	return 0;
 }

src/ldso/i386/tlsdesc.s

+.text
+.global __tlsdesc_static
+.type __tlsdesc_static,@function
+__tlsdesc_static:
+	mov 4(%eax),%eax
+	ret
+
+.global __tlsdesc_dynamic
+.type __tlsdesc_dynamic,@function
+__tlsdesc_dynamic:
+	mov 4(%eax),%eax
+	push %edx
+	mov %gs:4,%edx
+	push %ecx
+	mov (%eax),%ecx
+	cmp %ecx,(%edx)
+	jc 1f
+	mov 4(%eax),%eax
+	add (%edx,%ecx,4),%eax
+2:	pop %ecx
+	sub %gs:0,%eax
+	pop %edx
+	ret
+1:	push %eax
+	call __tls_get_addr
+	pop %ecx
+	jmp 2b