x86: Allow relocation code to build without text base

This code currently requires CONFIG_SYS_TEXT_BASE but this should be
unnecessary. As a first step, remove the build-time limitation and report an
error instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/lib/relocate.c

@@ -58,6 +58,7 @@ int do_elf_reloc_fixups(void)
 
 	Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
 	Elf32_Addr *offset_ptr_ram;
+	unsigned int text_base = 0;
 
 	/* The size of the region of u-boot that runs out of RAM. */
 	uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
@@ -67,29 +68,33 @@ int do_elf_reloc_fixups(void)
 	if (re_src == re_end)
 		panic("No relocation data");
 
+#ifdef CONFIG_SYS_TEXT_BASE
+	text_base = CONFIG_SYS_TEXT_BASE;
+#else
+	panic("No CONFIG_SYS_TEXT_BASE");
+#endif
 	do {
 		/* Get the location from the relocation entry */
 		offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
 
 		/* Check that the location of the relocation is in .text */
-		if (offset_ptr_rom >= (Elf32_Addr *)CONFIG_SYS_TEXT_BASE &&
-				offset_ptr_rom > last_offset) {
+		if (offset_ptr_rom >= (Elf32_Addr *)text_base &&
+		    offset_ptr_rom > last_offset) {
 
 			/* Switch to the in-RAM version */
 			offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
 							gd->reloc_off);
 
 			/* Check that the target points into .text */
-			if (*offset_ptr_ram >= CONFIG_SYS_TEXT_BASE &&
-					*offset_ptr_ram <=
-					(CONFIG_SYS_TEXT_BASE + size)) {
+			if (*offset_ptr_ram >= text_base &&
+			    *offset_ptr_ram <= text_base + size) {
 				*offset_ptr_ram += gd->reloc_off;
 			} else {
 				debug("   %p: rom reloc %x, ram %p, value %x,"
 					" limit %" PRIXPTR "\n", re_src,
 					re_src->r_offset, offset_ptr_ram,
 					*offset_ptr_ram,
-					CONFIG_SYS_TEXT_BASE + size);
+					text_base + size);
 			}
 		} else {
 			debug("   %p: rom reloc %x, last %p\n", re_src,