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https://github.com/zephyrproject-rtos/zephyr
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3d80208025
- In early boot, enable the syscall instruction and set up necessary MSRs - Add a hook to update page tables on context switch - Properly initialize thread based on whether it will start in user or supervisor mode - Add landing function for system calls to execute the desired handler - Implement arch_user_string_nlen() - Implement logic for dropping a thread down to user mode - Reserve per-CPU storage space for user and privilege elevation stack pointers, necessary for handling syscalls when no free registers are available - Proper handling of gs register considerations when transitioning privilege levels Kernel page table isolation (KPTI) is not yet implemented. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
38 lines
742 B
C
38 lines
742 B
C
/*
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* Copyright (c) 2019 Intel Corporation
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <ksched.h>
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#include <kernel_structs.h>
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#include <kernel_internal.h>
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#include <logging/log.h>
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LOG_MODULE_DECLARE(os);
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void z_x86_exception(z_arch_esf_t *esf)
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{
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switch (esf->vector) {
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case Z_X86_OOPS_VECTOR:
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z_x86_do_kernel_oops(esf);
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break;
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case IV_PAGE_FAULT:
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z_x86_page_fault_handler(esf);
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break;
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default:
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z_x86_unhandled_cpu_exception(esf->vector, esf);
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CODE_UNREACHABLE;
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}
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}
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#ifdef CONFIG_USERSPACE
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void arch_syscall_oops(void *ssf_ptr)
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{
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struct x86_ssf *ssf = ssf_ptr;
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LOG_ERR("Bad system call from RIP 0x%lx", ssf->rip);
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z_x86_fatal_error(K_ERR_KERNEL_OOPS, NULL);
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}
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#endif /* CONFIG_USERSPACE */
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