mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-07-25 16:19:48 +02:00
Charlie JenkinsandGreg Kroah-Hartman
f5f235be76
commit2116988d53upstream. The hint address should not forcefully restrict the addresses returned by mmap as this causes mmap to report ENOMEM when there is memory still available. Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Fixes:b5b4287acc("riscv: mm: Use hint address in mmap if available") Fixes:add2cc6b65("RISC-V: mm: Restrict address space for sv39,sv48,sv57") Closes: https://lore.kernel.org/linux-kernel/ZbxTNjQPFKBatMq+@ghost/T/#mccb1890466bf5a488c9ce7441e57e42271895765 Link: https://lore.kernel.org/r/20240826-riscv_mmap-v1-3-cd8962afe47f@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> [ Adjust removed lines ] Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn> Tested-by: Han Gao <rabenda.cn@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
117 lines
3.0 KiB
C
117 lines
3.0 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 <linux/cache.h>
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#include <vdso/processor.h>
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#include <asm/ptrace.h>
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#define arch_get_mmap_end(addr, len, flags) \
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({ \
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STACK_TOP_MAX; \
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})
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#define arch_get_mmap_base(addr, base) \
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({ \
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base; \
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})
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#ifdef CONFIG_64BIT
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#define DEFAULT_MAP_WINDOW (UL(1) << (MMAP_VA_BITS - 1))
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#define STACK_TOP_MAX TASK_SIZE
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#else
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#define DEFAULT_MAP_WINDOW TASK_SIZE
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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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#define STACK_TOP DEFAULT_MAP_WINDOW
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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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#ifdef CONFIG_64BIT
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#define TASK_UNMAPPED_BASE PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3)
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#else
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#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3)
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#endif
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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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unsigned long vstate_ctrl;
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struct __riscv_v_ext_state vstate;
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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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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, unsigned long *hartid);
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int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid);
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int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
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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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extern unsigned long signal_minsigstksz __ro_after_init;
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#ifdef CONFIG_RISCV_ISA_V
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/* Userspace interface for PR_RISCV_V_{SET,GET}_VS prctl()s: */
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#define RISCV_V_SET_CONTROL(arg) riscv_v_vstate_ctrl_set_current(arg)
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#define RISCV_V_GET_CONTROL() riscv_v_vstate_ctrl_get_current()
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extern long riscv_v_vstate_ctrl_set_current(unsigned long arg);
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extern long riscv_v_vstate_ctrl_get_current(void);
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#endif /* CONFIG_RISCV_ISA_V */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_RISCV_PROCESSOR_H */
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