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https://github.com/ARM-software/arm-trusted-firmware.git
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97043ac98e
Reduce the number of header files included from other header files as much as possible without splitting the files. Use forward declarations where possible. This allows removal of some unnecessary "#ifndef __ASSEMBLY__" statements. Also, review the .c and .S files for which header files really need including and reorder the #include statements alphabetically. Fixes ARM-software/tf-issues#31 Change-Id: Iec92fb976334c77453e010b60bcf56f3be72bd3e
101 lines
4 KiB
ArmAsm
101 lines
4 KiB
ArmAsm
/*
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* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
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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 are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND 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 COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <asm_macros.S>
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#include "tspd_private.h"
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.global tspd_enter_sp
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/* ---------------------------------------------
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* This function is called with SP_EL0 as stack.
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* Here we stash our EL3 callee-saved registers
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* on to the stack as a part of saving the C
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* runtime and enter the secure payload.
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* 'x0' contains a pointer to the memory where
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* the address of the C runtime context is to be
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* saved.
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* ---------------------------------------------
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*/
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func tspd_enter_sp
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/* Make space for the registers that we're going to save */
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mov x3, sp
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str x3, [x0, #0]
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sub sp, sp, #TSPD_C_RT_CTX_SIZE
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/* Save callee-saved registers on to the stack */
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stp x19, x20, [sp, #TSPD_C_RT_CTX_X19]
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stp x21, x22, [sp, #TSPD_C_RT_CTX_X21]
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stp x23, x24, [sp, #TSPD_C_RT_CTX_X23]
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stp x25, x26, [sp, #TSPD_C_RT_CTX_X25]
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stp x27, x28, [sp, #TSPD_C_RT_CTX_X27]
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stp x29, x30, [sp, #TSPD_C_RT_CTX_X29]
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/* ---------------------------------------------
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* Everything is setup now. el3_exit() will
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* use the secure context to restore to the
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* general purpose and EL3 system registers to
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* ERET into the secure payload.
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* ---------------------------------------------
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*/
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b el3_exit
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/* ---------------------------------------------
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* This function is called 'x0' pointing to a C
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* runtime context saved in tspd_enter_sp(). It
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* restores the saved registers and jumps to
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* that runtime with 'x0' as the new sp. This
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* destroys the C runtime context that had been
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* built on the stack below the saved context by
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* the caller. Later the second parameter 'x1'
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* is passed as return value to the caller
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* ---------------------------------------------
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*/
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.global tspd_exit_sp
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func tspd_exit_sp
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/* Restore the previous stack */
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mov sp, x0
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/* Restore callee-saved registers on to the stack */
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ldp x19, x20, [x0, #(TSPD_C_RT_CTX_X19 - TSPD_C_RT_CTX_SIZE)]
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ldp x21, x22, [x0, #(TSPD_C_RT_CTX_X21 - TSPD_C_RT_CTX_SIZE)]
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ldp x23, x24, [x0, #(TSPD_C_RT_CTX_X23 - TSPD_C_RT_CTX_SIZE)]
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ldp x25, x26, [x0, #(TSPD_C_RT_CTX_X25 - TSPD_C_RT_CTX_SIZE)]
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ldp x27, x28, [x0, #(TSPD_C_RT_CTX_X27 - TSPD_C_RT_CTX_SIZE)]
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ldp x29, x30, [x0, #(TSPD_C_RT_CTX_X29 - TSPD_C_RT_CTX_SIZE)]
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/* ---------------------------------------------
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* This should take us back to the instruction
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* after the call to the last tspd_enter_sp().
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* Place the second parameter to x0 so that the
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* caller will see it as a return value from the
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* original entry call
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* ---------------------------------------------
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*/
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mov x0, x1
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ret
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