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/*
* Copyrigh (c) 2015 Hesham Almatary <hesham@alumni.york.ac.uk>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/asm.h>
#include <rtems/score/cpu.h>
.section .text
PUBLIC(_CPU_Context_validate)
SYM(_CPU_Context_validate):
/* RISC-V/RTEMS context has 36 registers of CPU_SIZEOF_POINTER size */
addi sp, sp, -1 * 36 * CPU_SIZEOF_POINTER
SREG x1, (1 * CPU_SIZEOF_POINTER)(sp)
/* Skip x2/sp */
SREG x3, (3 * CPU_SIZEOF_POINTER)(sp)
SREG x4, (4 * CPU_SIZEOF_POINTER)(sp)
SREG x5, (5 * CPU_SIZEOF_POINTER)(sp)
SREG x6, (6 * CPU_SIZEOF_POINTER)(sp)
SREG x7, (7 * CPU_SIZEOF_POINTER)(sp)
SREG x8, (8 * CPU_SIZEOF_POINTER)(sp)
SREG x9, (9 * CPU_SIZEOF_POINTER)(sp)
SREG x10, (10 * CPU_SIZEOF_POINTER)(sp)
SREG x11, (11 * CPU_SIZEOF_POINTER)(sp)
SREG x12, (12 * CPU_SIZEOF_POINTER)(sp)
SREG x13, (13 * CPU_SIZEOF_POINTER)(sp)
SREG x14, (14 * CPU_SIZEOF_POINTER)(sp)
SREG x15, (15 * CPU_SIZEOF_POINTER)(sp)
SREG x16, (16 * CPU_SIZEOF_POINTER)(sp)
SREG x17, (17 * CPU_SIZEOF_POINTER)(sp)
SREG x18, (18 * CPU_SIZEOF_POINTER)(sp)
SREG x19, (19 * CPU_SIZEOF_POINTER)(sp)
SREG x20, (20 * CPU_SIZEOF_POINTER)(sp)
SREG x21, (21 * CPU_SIZEOF_POINTER)(sp)
SREG x22, (22 * CPU_SIZEOF_POINTER)(sp)
SREG x23, (23 * CPU_SIZEOF_POINTER)(sp)
SREG x24, (24 * CPU_SIZEOF_POINTER)(sp)
SREG x25, (25 * CPU_SIZEOF_POINTER)(sp)
SREG x26, (26 * CPU_SIZEOF_POINTER)(sp)
SREG x27, (27 * CPU_SIZEOF_POINTER)(sp)
SREG x28, (28 * CPU_SIZEOF_POINTER)(sp)
SREG x29, (28 * CPU_SIZEOF_POINTER)(sp)
SREG x30, (30 * CPU_SIZEOF_POINTER)(sp)
SREG x31, (31 * CPU_SIZEOF_POINTER)(sp)
/* Fill */
/* t0 is used for temporary values */
mv t0, x0
/* x31 contains the stack pointer */
mv x31, sp
.macro fill_register reg
addi t0, t0, 1
mv \reg, t0
.endm
fill_register x1
fill_register x2
fill_register x3
fill_register x4
fill_register x5
fill_register x6
fill_register x7
fill_register x8
fill_register x9
fill_register x10
fill_register x11
fill_register x12
fill_register x13
fill_register x14
fill_register x15
fill_register x16
fill_register x17
fill_register x18
fill_register x19
fill_register x20
fill_register x21
fill_register x22
fill_register x23
fill_register x24
fill_register x25
fill_register x26
fill_register x27
fill_register x28
fill_register x29
fill_register x30
fill_register x31
/* Check */
check:
.macro check_register reg
addi t0, t0, 1
bne \reg, t0, restore
.endm
bne x31, sp, restore
mv t0, x0
check_register x1
check_register x2
check_register x3
check_register x4
check_register x5
check_register x6
check_register x7
check_register x8
check_register x9
check_register x10
check_register x11
check_register x12
check_register x13
check_register x14
check_register x15
check_register x16
check_register x17
check_register x18
check_register x19
check_register x20
check_register x21
check_register x22
check_register x23
check_register x24
check_register x25
check_register x26
check_register x27
check_register x28
check_register x29
check_register x30
check_register x31
j check
/* Restore */
restore:
LREG x1, (1 * CPU_SIZEOF_POINTER)(sp)
/* Skip sp/x2 */
LREG x3, (3 * CPU_SIZEOF_POINTER)(sp)
LREG x4, (4 * CPU_SIZEOF_POINTER)(sp)
LREG x5, (5 * CPU_SIZEOF_POINTER)(sp)
LREG x6, (6 * CPU_SIZEOF_POINTER)(sp)
LREG x7, (7 * CPU_SIZEOF_POINTER)(sp)
LREG x8, (8 * CPU_SIZEOF_POINTER)(sp)
LREG x9, (9 * CPU_SIZEOF_POINTER)(sp)
LREG x10, (10 * CPU_SIZEOF_POINTER)(sp)
LREG x11, (11 * CPU_SIZEOF_POINTER)(sp)
LREG x12, (12 * CPU_SIZEOF_POINTER)(sp)
LREG x13, (13 * CPU_SIZEOF_POINTER)(sp)
LREG x14, (14 * CPU_SIZEOF_POINTER)(sp)
LREG x15, (15 * CPU_SIZEOF_POINTER)(sp)
LREG x16, (16 * CPU_SIZEOF_POINTER)(sp)
LREG x17, (17 * CPU_SIZEOF_POINTER)(sp)
LREG x18, (18 * CPU_SIZEOF_POINTER)(sp)
LREG x19, (19 * CPU_SIZEOF_POINTER)(sp)
LREG x20, (20 * CPU_SIZEOF_POINTER)(sp)
LREG x21, (21 * CPU_SIZEOF_POINTER)(sp)
LREG x22, (22 * CPU_SIZEOF_POINTER)(sp)
LREG x23, (23 * CPU_SIZEOF_POINTER)(sp)
LREG x24, (24 * CPU_SIZEOF_POINTER)(sp)
LREG x25, (25 * CPU_SIZEOF_POINTER)(sp)
LREG x26, (26 * CPU_SIZEOF_POINTER)(sp)
LREG x27, (27 * CPU_SIZEOF_POINTER)(sp)
LREG x28, (28 * CPU_SIZEOF_POINTER)(sp)
LREG x29, (29 * CPU_SIZEOF_POINTER)(sp)
LREG x30, (30 * CPU_SIZEOF_POINTER)(sp)
LREG x31, (31 * CPU_SIZEOF_POINTER)(sp)
addi sp, sp, 36 * CPU_SIZEOF_POINTER
ret
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