25a282dabc
This patch switches every last part of Coreboot on ARM over to Thumb mode: libpayload, the internal libgcc, and assorted assembly files. In combination with the respective depthcharge patch, this will switch to Thumb mode right after the entry point of the bootblock and not switch back to ARM until the final assembly stub that jumps to the kernel. The required changes to make this work include some new headers and Makefile flags to handle assembly files (using the unified syntax and the same helper macros as Linux), modifying our custom-written libgcc code for 64-bit division to support Thumb (removing some stale old files that were never really used for clarity), and flipping the general CFLAGS to Thumb (some more cleanup there as well while I'm at it). BUG=None TEST=Snow and Nyan still boot. Original-Change-Id: I80c04281e3adbf74f9f477486a96b9fafeb455b3 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/182212 Original-Reviewed-by: Gabe Black <gabeblack@chromium.org> (cherry picked from commit 5f65c17cbfae165a95354146ae79e06c512c2c5a) Conflicts: payloads/libpayload/include/arm/arch/asm.h src/arch/arm/Makefile.inc src/arch/arm/armv7/Makefile.inc *** There is an issue with what to do with ramstage-S-ccopts, and *** will need to be covered in additional ARM cleanup patches. Change-Id: I80c04281e3adbf74f9f477486a96b9fafeb455b3 Signed-off-by: Marc Jones <marc.jones@se-eng.com> Reviewed-on: http://review.coreboot.org/6930 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright 2013 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __ARM_ASM_H
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#define __ARM_ASM_H
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/* __arm__ is defined regardless of Thumb mode, so need to order this right */
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#if defined __thumb2__
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# define ARM(x...)
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# define THUMB(x...) x
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# define W(instr) instr.w
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#elif defined __thumb__
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# error You are not compiling Thumb2, this won't work!
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#else
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# define ARM(x...) x
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# define THUMB(x...)
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# define W(instr) instr
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#endif
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#define ALIGN .align 0
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#define ENDPROC(name) \
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.type name, %function; \
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END(name)
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#define ENTRY(name) \
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.globl name; \
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ALIGN; \
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name:
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#define END(name) \
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.size name, .-name
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/* Everything should go into the text section by default. */
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.text
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/* Thumb code uses the (new) unified assembly syntax. */
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THUMB( .syntax unified )
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#endif /* __ARM_ASM_H */
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