262 lines
6.9 KiB
C
262 lines
6.9 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-11-18 Jesven first version
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* 2021-02-03 lizhirui port to riscv64
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* 2021-02-06 lizhirui add thread filter
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* 2021-02-19 lizhirui port to new version of rt-smart
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* 2021-03-02 lizhirui add a auxillary function for interrupt
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* 2021-03-04 lizhirui delete thread filter
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* 2021-03-04 lizhirui modify for new version of rt-smart
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* 2021-11-22 JasonHu add lwp_set_thread_context
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* 2021-11-30 JasonHu add clone/fork support
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <stddef.h>
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#ifdef ARCH_MM_MMU
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#define DBG_TAG "lwp.arch"
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#define DBG_LVL DBG_INFO
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#include <rtdbg.h>
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#include <lwp.h>
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#include <lwp_arch.h>
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#include <lwp_user_mm.h>
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#include <page.h>
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#include <cpuport.h>
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#include <encoding.h>
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#include <stack.h>
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extern rt_ubase_t MMUTable[];
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void *lwp_copy_return_code_to_user_stack()
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{
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void lwp_thread_return();
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void lwp_thread_return_end();
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rt_thread_t tid = rt_thread_self();
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if (tid->user_stack != RT_NULL)
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{
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rt_size_t size = (rt_size_t)lwp_thread_return_end - (rt_size_t)lwp_thread_return;
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rt_size_t userstack = (rt_size_t)tid->user_stack + tid->user_stack_size - size;
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rt_memcpy((void *)userstack, lwp_thread_return, size);
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return (void *)userstack;
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}
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return RT_NULL;
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}
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rt_ubase_t lwp_fix_sp(rt_ubase_t cursp)
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{
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void lwp_thread_return();
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void lwp_thread_return_end();
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if (cursp == 0)
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{
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return 0;
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}
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return cursp - ((rt_size_t)lwp_thread_return_end - (rt_size_t)lwp_thread_return);
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}
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rt_thread_t rt_thread_sp_to_thread(void *spmember_addr)
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{
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return (rt_thread_t)(((rt_ubase_t)spmember_addr) - (offsetof(struct rt_thread, sp)));
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}
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void *get_thread_kernel_stack_top(rt_thread_t thread)
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{
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return (void *)(((rt_size_t)thread->stack_addr) + ((rt_size_t)thread->stack_size));
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}
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void *arch_get_user_sp(void)
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{
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/* user sp saved in interrupt context */
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rt_thread_t self = rt_thread_self();
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rt_uint8_t *stack_top = (rt_uint8_t *)self->stack_addr + self->stack_size;
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struct rt_hw_stack_frame *frame = (struct rt_hw_stack_frame *)(stack_top - sizeof(struct rt_hw_stack_frame));
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return (void *)frame->user_sp_exc_stack;
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}
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int arch_user_space_init(struct rt_lwp *lwp)
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{
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rt_ubase_t *mmu_table;
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mmu_table = (rt_ubase_t *)rt_pages_alloc_ext(0, PAGE_ANY_AVAILABLE);
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if (!mmu_table)
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{
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return -RT_ENOMEM;
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}
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lwp->end_heap = USER_HEAP_VADDR;
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rt_memcpy(mmu_table, rt_kernel_space.page_table, ARCH_PAGE_SIZE);
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rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_table, ARCH_PAGE_SIZE);
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lwp->aspace = rt_aspace_create(
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(void *)USER_VADDR_START, USER_VADDR_TOP - USER_VADDR_START, mmu_table);
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if (!lwp->aspace)
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{
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return -RT_ERROR;
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}
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return 0;
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}
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void *arch_kernel_mmu_table_get(void)
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{
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return (void *)((char *)MMUTable);
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}
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void arch_user_space_free(struct rt_lwp *lwp)
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{
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if (lwp)
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{
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RT_ASSERT(lwp->aspace);
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void *pgtbl = lwp->aspace->page_table;
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rt_aspace_delete(lwp->aspace);
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/* must be freed after aspace delete, pgtbl is required for unmap */
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rt_pages_free(pgtbl, 0);
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lwp->aspace = RT_NULL;
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}
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else
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{
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LOG_W("%s: NULL lwp as parameter", __func__);
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RT_ASSERT(0);
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}
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}
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long _sys_clone(void *arg[]);
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long sys_clone(void *arg[])
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{
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return _sys_clone(arg);
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}
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long _sys_fork(void);
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long sys_fork(void)
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{
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return _sys_fork();
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}
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long _sys_vfork(void);
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long sys_vfork(void)
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{
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return _sys_fork();
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}
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/**
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* set exec context for fork/clone.
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*/
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int arch_set_thread_context(void (*exit)(void), void *new_thread_stack,
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void *user_stack, void **thread_sp)
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{
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RT_ASSERT(exit != RT_NULL);
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RT_ASSERT(user_stack != RT_NULL);
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RT_ASSERT(new_thread_stack != RT_NULL);
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RT_ASSERT(thread_sp != RT_NULL);
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struct rt_hw_stack_frame *syscall_frame;
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struct rt_hw_stack_frame *thread_frame;
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rt_uint8_t *stk;
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rt_uint8_t *syscall_stk;
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stk = (rt_uint8_t *)new_thread_stack;
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/* reserve syscall context, all the registers are copyed from parent */
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stk -= CTX_REG_NR * REGBYTES;
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syscall_stk = stk;
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syscall_frame = (struct rt_hw_stack_frame *)stk;
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/* modify user sp */
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syscall_frame->user_sp_exc_stack = (rt_ubase_t)user_stack;
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/* skip ecall */
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syscall_frame->epc += 4;
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/* child return value is 0 */
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syscall_frame->a0 = 0;
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syscall_frame->a1 = 0;
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/* reset thread area */
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rt_thread_t thread = rt_container_of((unsigned long)thread_sp, struct rt_thread, sp);
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syscall_frame->tp = (rt_ubase_t)thread->thread_idr;
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#ifdef ARCH_USING_NEW_CTX_SWITCH
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extern void *_rt_hw_stack_init(rt_ubase_t *sp, rt_ubase_t ra, rt_ubase_t sstatus);
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rt_ubase_t sstatus = read_csr(sstatus) | SSTATUS_SPP;
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sstatus &= ~SSTATUS_SIE;
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/* compatible to RESTORE_CONTEXT */
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stk = (void *)_rt_hw_stack_init((rt_ubase_t *)stk, (rt_ubase_t)exit, sstatus);
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#else
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/* build temp thread context */
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stk -= sizeof(struct rt_hw_stack_frame);
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thread_frame = (struct rt_hw_stack_frame *)stk;
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int i;
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for (i = 0; i < sizeof(struct rt_hw_stack_frame) / sizeof(rt_ubase_t); i++)
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{
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((rt_ubase_t *)thread_frame)[i] = 0xdeadbeaf;
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}
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/* set pc for thread */
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thread_frame->epc = (rt_ubase_t)exit;
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/* set old exception mode as supervisor, because in kernel */
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thread_frame->sstatus = read_csr(sstatus) | SSTATUS_SPP;
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thread_frame->sstatus &= ~SSTATUS_SIE; /* must disable interrupt */
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/* set stack as syscall stack */
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thread_frame->user_sp_exc_stack = (rt_ubase_t)syscall_stk;
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#endif /* ARCH_USING_NEW_CTX_SWITCH */
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/* save new stack top */
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*thread_sp = (void *)stk;
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/**
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* The stack for child thread:
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*
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* +------------------------+ --> kernel stack top
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* | syscall stack |
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* | |
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* | @sp | --> `user_stack`
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* | @epc | --> user ecall addr + 4 (skip ecall)
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* | @a0&a1 | --> 0 (for child return 0)
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* | |
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* +------------------------+ --> temp thread stack top
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* | temp thread stack | ^
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* | | |
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* | @sp | ---------/
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* | @epc | --> `exit` (arch_clone_exit/arch_fork_exit)
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* | |
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* +------------------------+ --> thread sp
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*/
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}
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/**
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* void lwp_exec_user(void *args, void *kernel_stack, void *user_entry)
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*/
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void lwp_exec_user(void *args, void *kernel_stack, void *user_entry)
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{
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arch_start_umode(args, user_entry, (void *)USER_STACK_VEND, kernel_stack);
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}
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void *arch_get_usp_from_uctx(struct rt_user_context *uctx)
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{
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return uctx->sp;
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}
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#endif /* ARCH_MM_MMU */
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