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/*
* Copyright (c) 2017-2018 Richard Braun.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "asm.h"
#include "boot.h"
#include "cpu.h"
.section .text, "ax"
.macro CPU_EXC_STORE_REGISTERS
stmfd %r0!, {%r4-%r11}
.endm
.macro CPU_EXC_LOAD_REGISTERS
ldmfd %r0!, {%r4-%r11}
.endm
ASM_FUNC(cpu_exc_svcall)
stmfd %r13!, {%r14} /* save R14 */
bl thread_yield_from_svcall /* thread_yield_from_svcall() */
CPU_EXC_LOAD_REGISTERS
msr psp, %r0 /* reload stack in case of context switch */
ldmfd %r13!, {%r14} /* restore R14 */
bx %r14 /* return from exception */
ASM_FUNC(cpu_exc_pendsv)
stmfd %r13!, {%r14} /* save R14 */
mrs %r0, psp /* pass the new stack pointer as argument 0 */
CPU_EXC_STORE_REGISTERS
bl thread_yield_from_pendsv /* thread_yield_from_pendsv(sp) */
CPU_EXC_LOAD_REGISTERS
msr psp, %r0 /* reload stack in case of context switch */
ldmfd %r13!, {%r14} /* restore R14 */
bx %r14 /* return from exception */
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