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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-05-18 Jesven first version
* 2023-07-16 Shell Move part of the codes to C from asm in signal handling
*/
#include <armv8.h>
#include <rthw.h>
#include <rtthread.h>
#include <stdlib.h>
#include <string.h>
#include <lwp_signal.h>
#ifdef ARCH_MM_MMU
#define DBG_TAG "lwp.arch"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <lwp_arch.h>
#include <lwp_user_mm.h>
extern size_t MMUTable[];
int arch_user_space_init(struct rt_lwp *lwp)
{
size_t *mmu_table;
mmu_table = (size_t *)rt_pages_alloc_ext(0, PAGE_ANY_AVAILABLE);
if (!mmu_table)
{
return -RT_ENOMEM;
}
lwp->end_heap = USER_HEAP_VADDR;
memset(mmu_table, 0, ARCH_PAGE_SIZE);
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_table, ARCH_PAGE_SIZE);
lwp->aspace = rt_aspace_create(
(void *)USER_VADDR_START, USER_VADDR_TOP - USER_VADDR_START, mmu_table);
if (!lwp->aspace)
{
return -RT_ERROR;
}
return 0;
}
void *arch_kernel_mmu_table_get(void)
{
return (void *)NULL;
}
void arch_user_space_free(struct rt_lwp *lwp)
{
if (lwp)
{
RT_ASSERT(lwp->aspace);
void *pgtbl = lwp->aspace->page_table;
rt_aspace_delete(lwp->aspace);
/* must be freed after aspace delete, pgtbl is required for unmap */
rt_pages_free(pgtbl, 0);
lwp->aspace = NULL;
}
else
{
LOG_W("%s: NULL lwp as parameter", __func__);
RT_ASSERT(0);
}
}
int arch_expand_user_stack(void *addr)
{
int ret = 0;
size_t stack_addr = (size_t)addr;
stack_addr &= ~ARCH_PAGE_MASK;
if ((stack_addr >= (size_t)USER_STACK_VSTART) &&
(stack_addr < (size_t)USER_STACK_VEND))
{
void *map =
lwp_map_user(lwp_self(), (void *)stack_addr, ARCH_PAGE_SIZE, 0);
if (map || lwp_user_accessable(addr, 1))
{
ret = 1;
}
}
return ret;
}
#endif
#define ALGIN_BYTES (16)
struct signal_ucontext
{
rt_int64_t sigreturn;
lwp_sigset_t save_sigmask;
siginfo_t si;
rt_align(16)
struct rt_hw_exp_stack frame;
};
void *arch_signal_ucontext_restore(rt_base_t user_sp)
{
struct signal_ucontext *new_sp;
new_sp = (void *)user_sp;
if (lwp_user_accessable(new_sp, sizeof(*new_sp)))
{
lwp_thread_signal_mask(rt_thread_self(), LWP_SIG_MASK_CMD_SET_MASK, &new_sp->save_sigmask, RT_NULL);
}
else
{
LOG_I("User frame corrupted during signal handling\nexiting...");
sys_exit_group(EXIT_FAILURE);
}
return (char *)&new_sp->frame + sizeof(struct rt_hw_exp_stack);
}
void *arch_signal_ucontext_save(rt_base_t user_sp, siginfo_t *psiginfo,
struct rt_hw_exp_stack *exp_frame,
lwp_sigset_t *save_sig_mask)
{
struct signal_ucontext *new_sp;
new_sp = (void *)(user_sp - sizeof(struct signal_ucontext));
if (lwp_user_accessable(new_sp, sizeof(*new_sp)))
{
/* push psiginfo */
if (psiginfo)
{
lwp_memcpy(&new_sp->si, psiginfo, sizeof(*psiginfo));
}
/* exp frame is already aligned as AAPCS64 required */
lwp_memcpy(&new_sp->frame, exp_frame, sizeof(*exp_frame));
/* copy the save_sig_mask */
lwp_memcpy(&new_sp->save_sigmask, save_sig_mask, sizeof(lwp_sigset_t));
/* copy lwp_sigreturn */
const size_t lwp_sigreturn_bytes = 8;
extern void lwp_sigreturn(void);
/* -> ensure that the sigreturn start at the outer most boundary */
lwp_memcpy(&new_sp->sigreturn, &lwp_sigreturn, lwp_sigreturn_bytes);
}
else
{
LOG_I("%s: User stack overflow", __func__);
sys_exit_group(EXIT_FAILURE);
}
return new_sp;
}
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