542a7fa25d
The IRQ handler has had a major changes to manage syscall, reschedule and interrupt from user thread and stack guard. Add userspace support: - Use a global variable to know if the current execution is user or machine. The location of this variable is read only for all user thread and read/write for kernel thread. - Memory shared is supported. - Use dynamic allocation to optimize PMP slot usage. If the area size is a power of 2, only one PMP slot is used, else 2 are used. Add stack guard support: - Use MPRV bit to force PMP rules to machine mode execution. - IRQ stack have a locked stack guard to avoid re-write PMP configuration registers for each interruption and then win some cycle. - The IRQ stack is used as "temporary" stack at the beginning of IRQ handler to save current ESF. That avoid to trigger write fault on thread stack during store ESF which that call IRQ handler to infinity. - A stack guard is also setup for privileged stack of a user thread. Thread: - A PMP setup is specific to each thread. PMP setup are saved in each thread structure to improve reschedule performance. Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com> Reviewed-by: Nicolas Royer <nroyer@baylibre.com>
96 lines
1.8 KiB
ArmAsm
96 lines
1.8 KiB
ArmAsm
/*
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* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
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* Contributors: 2018 Antmicro <www.antmicro.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <toolchain.h>
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#include <linker/sections.h>
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#include <arch/cpu.h>
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/* exports */
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GTEXT(__initialize)
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GTEXT(__reset)
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/* imports */
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GTEXT(_PrepC)
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#if CONFIG_INCLUDE_RESET_VECTOR
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SECTION_FUNC(reset, __reset)
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/*
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* jump to __initialize
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* use call opcode in case __initialize is far away.
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* This will be dependent on linker.ld configuration.
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*/
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call __initialize
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#endif /* CONFIG_INCLUDE_RESET_VECTOR */
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/* use ABI name of registers for the sake of simplicity */
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/*
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* Remainder of asm-land initialization code before we can jump into
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* the C domain
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*/
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SECTION_FUNC(TEXT, __initialize)
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/*
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* This will boot master core, just halt other cores.
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* Note: need to be updated for complete SMP support
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*/
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csrr a0, mhartid
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beqz a0, boot_master_core
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loop_slave_core:
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wfi
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j loop_slave_core
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boot_master_core:
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#ifdef CONFIG_FPU
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/*
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* Enable floating-point.
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*/
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li t0, MSTATUS_FS_INIT
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csrrs x0, mstatus, t0
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/*
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* Floating-point rounding mode set to IEEE-754 default, and clear
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* all exception flags.
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*/
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fscsr x0, x0
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#endif
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#ifdef CONFIG_INIT_STACKS
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/* Pre-populate all bytes in z_interrupt_stacks with 0xAA */
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la t0, z_interrupt_stacks
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li t1, CONFIG_ISR_STACK_SIZE
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add t1, t1, t0
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/* Populate z_interrupt_stacks with 0xaaaaaaaa */
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li t2, 0xaaaaaaaa
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aa_loop:
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sw t2, 0x00(t0)
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addi t0, t0, 4
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blt t0, t1, aa_loop
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#endif
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/*
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* Initially, setup stack pointer to
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* z_interrupt_stacks + CONFIG_ISR_STACK_SIZE
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*/
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la sp, z_interrupt_stacks
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li t0, CONFIG_ISR_STACK_SIZE
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add sp, sp, t0
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csrw mscratch, sp
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#ifdef CONFIG_WDOG_INIT
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call _WdogInit
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#endif
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/*
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* Jump into C domain. _PrepC zeroes BSS, copies rw data into RAM,
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* and then enters kernel z_cstart
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*/
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call _PrepC
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