arch: m68k: Implement relocation
Implement relocation for M68K. Perform all the updates in start.S
relocate_code in assemby, since it is a simple matter of traversing
the dynsym table and adding relocation offset - MONITOR_BASE to all
the items in that table. The necessity to deal with MONITOR_BASE is
a specific of M68K, where the ELF entry point is at offset 0x400,
which is the MONITOR_BASE, while TEXT_BASE is at offset 0 .
This also removes the one last user of NEEDS_MANUAL_RELOC, so that
could be finally cleaned up .
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/arch/m68k/cpu/mcf532x/start.S b/arch/m68k/cpu/mcf532x/start.S
index 72a2f99..c3eae73 100644
--- a/arch/m68k/cpu/mcf532x/start.S
+++ b/arch/m68k/cpu/mcf532x/start.S
@@ -192,6 +192,39 @@
cmp.l %a1,%a2
bgt.s 1b
+#define R_68K_32 1
+#define R_68K_RELATIVE 22
+
+ move.l #(__rel_dyn_start), %a1
+ move.l #(__rel_dyn_end), %a2
+
+fixloop:
+ move.l (%a1)+, %d1 /* Elf32_Rela r_offset */
+ move.l (%a1)+, %d2 /* Elf32_Rela r_info */
+ move.l (%a1)+, %d3 /* Elf32_Rela r_addend */
+
+ andi.l #0xff, %d2
+ cmp.l #R_68K_32, %d2
+ beq.s fixup
+ cmp.l #R_68K_RELATIVE, %d2
+ beq.s fixup
+
+ bra fixnext
+
+fixup:
+ /* relative fix: store addend plus offset at dest location */
+ move.l %a0, %a3
+ add.l %d1, %a3
+ sub.l #CONFIG_SYS_MONITOR_BASE, %a3
+ move.l (%a3), %d4
+ add.l %a0, %d4
+ sub.l #CONFIG_SYS_MONITOR_BASE, %d4
+ move.l %d4, (%a3)
+
+fixnext:
+ cmp.l %a1, %a2
+ bge.s fixloop
+
/*
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
@@ -206,10 +239,8 @@
/*
* Now clear BSS segment
*/
- move.l %a0, %a1
- add.l #(_sbss - CONFIG_SYS_MONITOR_BASE),%a1
- move.l %a0, %d1
- add.l #(_ebss - CONFIG_SYS_MONITOR_BASE),%d1
+ move.l #(_sbss), %a1
+ move.l #(_ebss), %d1
6:
clr.l (%a1)+
cmp.l %a1,%d1
@@ -218,24 +249,10 @@
/*
* fix got table in RAM
*/
- move.l %a0, %a1
- add.l #(__got_start - CONFIG_SYS_MONITOR_BASE),%a1
- move.l %a1,%a5 /* fix got pointer register a5 */
-
- move.l %a0, %a2
- add.l #(__got_end - CONFIG_SYS_MONITOR_BASE),%a2
-
-7:
- move.l (%a1),%d1
- sub.l #_start,%d1
- add.l %a0,%d1
- move.l %d1,(%a1)+
- cmp.l %a2, %a1
- bne 7b
+ move.l #(__got_start), %a5 /* fix got pointer register a5 */
/* calculate relative jump to board_init_r in ram */
- move.l %a0, %a1
- add.l #(board_init_r - CONFIG_SYS_MONITOR_BASE), %a1
+ move.l #(board_init_r), %a1
/* set parameters for board_init_r */
move.l %a0,-(%sp) /* dest_addr */