AArch32: Fix SCTLR context initialization

This patch fixes a bug in context management library when writing
SCTLR register during context initialization. The write happened
prior to initialization of the register context pointer. This
resulted in the compiler optimizing the write sequence from the
final binary and hence SCTLR remains uninitialized when
entering normal world. The bug is fixed by doing the
initialization of the register context pointer earlier in the
sequence.

Change-Id: Ic7465593a74534046b79f40446ffa1165c52ed76

lib/el3_runtime/aarch32/context_mgmt.c

@@ -86,6 +86,8 @@ static void cm_init_context_common(cpu_context_t *ctx, const entry_point_info_t
 	/* Clear any residual register values from the context */
 	memset(ctx, 0, sizeof(*ctx));
 
+	reg_ctx = get_regs_ctx(ctx);
+
 	/*
 	 * Base the context SCR on the current value, adjust for entry point
 	 * specific requirements
@@ -121,8 +123,6 @@ static void cm_init_context_common(cpu_context_t *ctx, const entry_point_info_t
 	if (GET_M32(ep->spsr) == MODE32_hyp)
 		scr |= SCR_HCE_BIT;
 
-	reg_ctx = get_regs_ctx(ctx);
-
 	write_ctx_reg(reg_ctx, CTX_SCR, scr);
 	write_ctx_reg(reg_ctx, CTX_LR, ep->pc);
 	write_ctx_reg(reg_ctx, CTX_SPSR, ep->spsr);