[PATCH v4 02/10] arm64: initialize the frame pointer register

[Casey Connolly]

From: Heinrich Schuchardt <xypron.glpk at gmx.de>

U-Boot may be compiled with frame pointers depending on defaults built into
compilers are via explicitly passing -fno-omit-frame-pointer.

To stop walking frames it is necessary that the initial value of the frame
pointer register is 0.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
 arch/arm/lib/crt0_64.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/lib/crt0_64.S b/arch/arm/lib/crt0_64.S
index f3f279f2c39cd27cc30801805999092d582cef52..3ff0577e9c87076e7fc6626fde3703fe952f07c8 100644
--- a/arch/arm/lib/crt0_64.S
+++ b/arch/arm/lib/crt0_64.S
@@ -167,8 +167,9 @@ clear_loop:
 
 	/* call board_init_r(gd_t *id, ulong dest_addr) */
 	mov	x0, x18				/* gd_t */
 	ldr	x1, [x18, #GD_RELOCADDR]	/* dest_addr */
+	mov	x29, 0				/* frame pointer */
 	b	board_init_r			/* PC relative jump */
 
 	/* NOTREACHED - board_init_r() does not return */
 #endif

-- 
2.50.0