b7f82e9559
This adds some assembly code to clear .bss segment. It might have been
already cleared by the loader, but it is not guaranteed. This also
helps when the program is loaded by the debugger.
BUG=none
TEST=observed that .bss is now initialized when the program is
restarted. Verified correct boundaries of the segment.
Original-Change-Id: I0aed0070da53881e4cf8c27049459040c006e765
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/201784
Original-Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Original-Reviewed-by: Trevor Bourget <tbourget@codeaurora.org>
(cherry picked from commit c89ecee5ddfc33a438d4d1926d3756a48f3c2576)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Change-Id: Ic0c33d2a8ad22cd23b3ccb73c603cb14ae2aab29
Reviewed-on: http://review.coreboot.org/8060
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
79 lines
2.3 KiB
ArmAsm
79 lines
2.3 KiB
ArmAsm
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 Advanced Micro Devices, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <arch/asm.h>
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/*
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* Our entry point
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*/
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ENTRY(_entry)
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/* TODO: disable interrupts */
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/* Clear BSS */
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mov r12, #0
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ldr r2, bss_boundaries
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ldr r3, bss_boundaries + 4
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cmp r2, r3
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beq no_bss
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sub r3, #4 /* Account for late condition check. */
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loop:
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cmp r2, r3
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str r12, [r2], #4
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blt loop
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no_bss:
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/* Save off the location of the coreboot tables */
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ldr r1, 1f
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str r0, [r1]
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/* Setup new stack */
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ldr sp, 2f
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/* TODO: Save old stack pointer and link register */
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/* Let's rock. */
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bl start_main
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/* %r0 has the return value - pass it on unmolested */
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/* TODO: restore old stack pointer and link register */
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/* Return to the original context. */
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bx lr
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ENDPROC(_entry)
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.align 4
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bss_boundaries:
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.word _edata
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.word _end
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1:
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.word cb_header_ptr
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2:
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.word _stack
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