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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: Ic1b790f27bce431124ba70cc2d3d3607c537564b
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: d50fd02db8bf10147fd808f3030e6297b9ca0aad
Original-Change-Id: I4bb8cea7435d2a0e2c1ced050c3366d2e636cb8a
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/225420
Original-Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://review.coreboot.org/9384
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Daisuke Nojiri 2014-10-24 09:38:31 -07:00 committed by Patrick Georgi
parent c5a4c12431
commit 907fd12cf6
1 changed files with 15 additions and 0 deletions
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15
src/arch/arm/armv7/bootblock_m.S
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@ -31,5 +31,20 @@
#include <arch/asm.h> #include <arch/asm.h>
ENTRY(_start) 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 bl main
ENDPROC(_start) ENDPROC(_start)