[PATCH 1/2] ARM: setupc_32: remove relocation code from setup_c

[Sascha Hauer]

All callers of setup_c() already call relocate_to_current_adr() or
relocate_to_adr() before setup_c(), so the relocation (memcpy) code
in setup_c is dead and also the sync_caches_for_execution() is unnecessary
Remove it and reduce setup_c to just clearing BSS.

Co-Authored-By: Claude Opus 4.6 <noreply at anthropic.com>
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 arch/arm/cpu/setupc_32.S | 27 +++++----------------------
 1 file changed, 5 insertions(+), 22 deletions(-)

diff --git a/arch/arm/cpu/setupc_32.S b/arch/arm/cpu/setupc_32.S
index 0134637f62..c2c3f97528 100644
--- a/arch/arm/cpu/setupc_32.S
+++ b/arch/arm/cpu/setupc_32.S
@@ -7,33 +7,16 @@
 .section .text.setupc
 
 /*
- * setup_c: copy binary to link address, clear bss and
- * continue executing at new address.
- *
- * This function does not return to the address it is
- * called from, but to the same location in the copied
- * binary.
+ * setup_c: clear bss
  */
 ENTRY(setup_c)
-	push	{r4, r5}
-	mov	r5, lr
-	bl	get_runtime_offset
-	subs	r4, r0, #0
-	beq	1f			/* skip memcpy if already at correct address */
-	ldr	r0,=_text
-	ldr	r2,=__bss_start
-	sub	r2, r2, r0
-	add	r1, r0, r4
-	bl	__memcpy			/* memcpy(_text, _text + offset, __bss_start - _text) */
-1:	ldr	r0, =__bss_start
+	mov	r4, lr
+	ldr	r0, =__bss_start
 	mov	r1, #0
 	ldr	r2, =__bss_stop
 	sub	r2, r2, r0
-	bl	__memset			/* clear bss */
-	bl	sync_caches_for_execution
-	sub	lr, r5, r4		/* adjust return address to new location */
-	pop	{r4, r5}
-	ret	lr
+	bl	__memset		/* clear bss */
+	ret	r4
 ENDPROC(setup_c)
 
 /*

-- 
2.47.3