From d50fd02db8bf10147fd808f3030e6297b9ca0aad Mon Sep 17 00:00:00 2001 From: Daisuke Nojiri Date: Fri, 24 Oct 2014 09:38:31 -0700 Subject: [PATCH] armv7-m: set stack pointer to _estack this change sets the stack pointer to the value specified in memlayout.ld before jumping to the bootblock. BUG=none BRANCH=ToT TEST=Built cosmos and all other current boards. Change-Id: I4bb8cea7435d2a0e2c1ced050c3366d2e636cb8a Signed-off-by: Daisuke Nojiri Reviewed-on: https://chromium-review.googlesource.com/225420 Reviewed-by: Vadim Bendebury --- src/arch/arm/armv7/bootblock_m.S | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/src/arch/arm/armv7/bootblock_m.S b/src/arch/arm/armv7/bootblock_m.S index 0a29a0b4cc..2e46ca064f 100644 --- a/src/arch/arm/armv7/bootblock_m.S +++ b/src/arch/arm/armv7/bootblock_m.S @@ -31,5 +31,20 @@ #include ENTRY(_start) + /* + * Initialize the stack to a known value. This is used to check for + * stack overflow later in the boot process. + */ + ldr r0, =_stack + ldr r1, =_estack + ldr r2, =0xdeadbeef +init_stack_loop: + str r2, [r0] + add r0, #4 + cmp r0, r1 + bne init_stack_loop + +call_bootblock: + ldr sp, =_estack /* Set up stack pointer */ bl main ENDPROC(_start)