mirror of
https://gitee.com/bianbu-linux/linux-6.6
synced 2025-04-24 14:07:52 -04:00
01abdfeac8
Make TASK_SIZE from const to dynamic detect TIF_32BIT flag function. Refer to arm64 to implement DEFAULT_MAP_WINDOW_64 for efi-stub. Limit 32-bit compatible process in 0-2GB virtual address range (which is enough for real scenarios), because it could avoid address sign extend problem when 32-bit enter 64-bit and ease software design. The standard 32-bit TASK_SIZE is 0x9dc00000:FIXADDR_START, and compared to a compatible 32-bit, it increases 476MB for the application's virtual address. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@kernel.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Tested-by: Heiko Stuebner <heiko@sntech.de> Link: https://lore.kernel.org/r/20220405071314.3225832-11-guoren@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_PROCESSOR_H
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#define _ASM_RISCV_PROCESSOR_H
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#include <linux/const.h>
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#include <vdso/processor.h>
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#include <asm/ptrace.h>
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/*
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* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
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#define STACK_TOP TASK_SIZE
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#ifdef CONFIG_64BIT
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#define STACK_TOP_MAX TASK_SIZE_64
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#else
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#define STACK_TOP_MAX TASK_SIZE
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#endif
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#define STACK_ALIGN 16
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#ifndef __ASSEMBLY__
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struct task_struct;
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struct pt_regs;
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/* CPU-specific state of a task */
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struct thread_struct {
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/* Callee-saved registers */
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unsigned long ra;
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unsigned long sp; /* Kernel mode stack */
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unsigned long s[12]; /* s[0]: frame pointer */
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struct __riscv_d_ext_state fstate;
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unsigned long bad_cause;
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};
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/* Whitelist the fstate from the task_struct for hardened usercopy */
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static inline void arch_thread_struct_whitelist(unsigned long *offset,
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unsigned long *size)
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{
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*offset = offsetof(struct thread_struct, fstate);
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*size = sizeof_field(struct thread_struct, fstate);
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}
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#define INIT_THREAD { \
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.sp = sizeof(init_stack) + (long)&init_stack, \
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}
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#define task_pt_regs(tsk) \
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((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
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- ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
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#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
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/* Do necessary setup to start up a newly executed thread. */
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extern void start_thread(struct pt_regs *regs,
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unsigned long pc, unsigned long sp);
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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extern unsigned long __get_wchan(struct task_struct *p);
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static inline void wait_for_interrupt(void)
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{
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__asm__ __volatile__ ("wfi");
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}
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struct device_node;
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int riscv_of_processor_hartid(struct device_node *node);
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int riscv_of_parent_hartid(struct device_node *node);
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extern void riscv_fill_hwcap(void);
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extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_RISCV_PROCESSOR_H */
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