treewide: rework linker symbol declarations in sections header

1. Convert all linker symbols to char[] type so that we can get the
   corresponding address by calling array name 'var' or its address
   '&var'. In this way, we can avoid some potential issues[1].
2. Remove unused symbol '_TEXT_BASE'. It has been abandoned and has
   not been referenced by any source code.
3. Move '__data_end' to the arch x86's own sections header as it's
   only used by x86 arch.
4. Remove some duplicate declared linker symbols. Now we use the
   standard header file to declare them.

[1] This patch fixes the boot failure on MIPS target. Error log:
SPL: Image overlaps SPL

Fixes: 1b8a1be1a1f1 ("spl: spl_legacy: Fix spl_end address")
Signed-off-by: Shiji Yang <[email protected]>
Reviewed-by: Tom Rini <[email protected]>

5 files changed, 6 insertions, 16 deletions

diff --git a/arch/arc/include/asm/sections.h b/arch/arc/include/asm/sections.h
index 1c9c9db1386..ffad4a684ef 100644
--- a/arch/arc/include/asm/sections.h
+++ b/arch/arc/include/asm/sections.h
@@ -8,7 +8,8 @@
 
 #include <asm-generic/sections.h>
 
-extern ulong __ivt_start;
-extern ulong __ivt_end;
+extern char __ivt_start[];
+extern char __ivt_end[];
+extern char __text_end[];
 
 #endif /* __ASM_ARC_SECTIONS_H */
diff --git a/arch/arc/lib/relocate.c b/arch/arc/lib/relocate.c
index 7f531c95eec..682e274f9bc 100644
--- a/arch/arc/lib/relocate.c
+++ b/arch/arc/lib/relocate.c
@@ -6,14 +6,9 @@
 #include <common.h>
 #include <elf.h>
 #include <log.h>
-#include <asm-generic/sections.h>
+#include <asm/sections.h>
 #include <asm/global_data.h>
 
-extern ulong __image_copy_start;
-extern ulong __ivt_start;
-extern ulong __ivt_end;
-extern ulong __text_end;
-
 DECLARE_GLOBAL_DATA_PTR;
 
 int copy_uboot_to_ram(void)
diff --git a/arch/arm/include/asm/spl.h b/arch/arm/include/asm/spl.h
index 0ece4b09060..ee79a19c05c 100644
--- a/arch/arm/include/asm/spl.h
+++ b/arch/arm/include/asm/spl.h
@@ -34,9 +34,6 @@ enum {
 };
 #endif
 
-/* Linker symbols. */
-extern char __bss_start[], __bss_end[];
-
 #ifndef CONFIG_DM
 extern gd_t gdata;
 #endif
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index 958018c1909..c0423eaf93a 100644
--- a/arch/microblaze/include/asm/processor.h
+++ b/arch/microblaze/include/asm/processor.h
@@ -6,11 +6,6 @@
 #ifndef __ASM_MICROBLAZE_PROCESSOR_H
 #define __ASM_MICROBLAZE_PROCESSOR_H
 
-/* References to section boundaries */
-
-extern char _end[];
-extern char __text_start[];
-
 /* Microblaze board initialization function */
 void board_init(void);
 
diff --git a/arch/x86/include/asm/sections.h b/arch/x86/include/asm/sections.h
index a6be3604e9b..874a43d16c7 100644
--- a/arch/x86/include/asm/sections.h
+++ b/arch/x86/include/asm/sections.h
@@ -8,4 +8,6 @@
 
 #include <asm-generic/sections.h>
 
+extern char __data_end[];
+
 #endif