From: Andrew F. Davis <afd@ti.com>
Date: Mon, 19 Nov 2018 20:47:53 +0000 (-0600)
Subject: ARM: armv7: Add early stack for erratum workarounds
X-Git-Tag: v2025.01-rc5-pxa1908~3266^2~7
X-Git-Url: http://git.dujemihanovic.xyz/img/static/git-logo.png?a=commitdiff_plain;h=a0106c82d677c611e479a6243f7a08252284e0f0;p=u-boot.git

ARM: armv7: Add early stack for erratum workarounds

Some erratum workarounds call into C code before the stack
is setup, this can lead to values pushed onto the stack
being lost, firewall exceptions, and other undefined behavior.

Setup a temporary stack to allow these functions to work
correctly.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>
---

diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 81edec01bf..0cb6dd39cc 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -205,6 +205,15 @@ ENTRY(cpu_init_cp15)
 	mov	r2, r3, lsl #4		@ shift variant field for combined value
 	orr	r2, r4, r2		@ r2 has combined CPU variant + revision
 
+/* Early stack for ERRATA that needs into call C code */
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)
+	ldr	r0, =(CONFIG_SPL_STACK)
+#else
+	ldr	r0, =(CONFIG_SYS_INIT_SP_ADDR)
+#endif
+	bic	r0, r0, #7	/* 8-byte alignment for ABI compliance */
+	mov	sp, r0
+
 #ifdef CONFIG_ARM_ERRATA_798870
 	cmp	r2, #0x30		@ Applies to lower than R3p0
 	bge	skip_errata_798870      @ skip if not affected rev