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94f00388c2
Charlie Jenkins <charlie@rivosinc.com> says: Make sv48 the default address space for mmap as some applications currently depend on this assumption. Users can now select a desired address space using a non-zero hint address to mmap. Previously, requesting the default address space from mmap by passing zero as the hint address would result in using the largest address space possible. Some applications depend on empty bits in the virtual address space, like Go and Java, so this patch provides more flexibility for application developers. * b4-shazam-merge: RISC-V: mm: Document mmap changes RISC-V: mm: Update pgtable comment documentation RISC-V: mm: Add tests for RISC-V mm RISC-V: mm: Restrict address space for sv39,sv48,sv57 Link: https://lore.kernel.org/r/20230809232218.849726-1-charlie@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
164 lines
4.8 KiB
C
164 lines
4.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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* Copyright (C) 2012 Regents of the University of California
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*/
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#ifndef _ASM_RISCV_ELF_H
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#define _ASM_RISCV_ELF_H
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#include <uapi/linux/elf.h>
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#include <linux/compat.h>
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#include <uapi/asm/elf.h>
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#include <asm/auxvec.h>
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#include <asm/byteorder.h>
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#include <asm/cacheinfo.h>
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#include <asm/hwcap.h>
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/*
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* These are used to set parameters in the core dumps.
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*/
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#define ELF_ARCH EM_RISCV
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#ifndef ELF_CLASS
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#ifdef CONFIG_64BIT
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#define ELF_CLASS ELFCLASS64
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#else
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#define ELF_CLASS ELFCLASS32
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#endif
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#endif
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#define ELF_DATA ELFDATA2LSB
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/*
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* This is used to ensure we don't load something for the wrong architecture.
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*/
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#define elf_check_arch(x) (((x)->e_machine == EM_RISCV) && \
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((x)->e_ident[EI_CLASS] == ELF_CLASS))
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extern bool compat_elf_check_arch(Elf32_Ehdr *hdr);
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#define compat_elf_check_arch compat_elf_check_arch
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#define CORE_DUMP_USE_REGSET
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#define ELF_FDPIC_CORE_EFLAGS 0
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#define ELF_EXEC_PAGESIZE (PAGE_SIZE)
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/*
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* This is the location that an ET_DYN program is loaded if exec'ed. Typical
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* use of this is to invoke "./ld.so someprog" to test out a new version of
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* the loader. We need to make sure that it is out of the way of the program
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* that it will "exec", and that there is sufficient room for the brk.
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*/
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#define ELF_ET_DYN_BASE ((DEFAULT_MAP_WINDOW / 3) * 2)
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#ifdef CONFIG_64BIT
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#ifdef CONFIG_COMPAT
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#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
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0x7ff >> (PAGE_SHIFT - 12) : \
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0x3ffff >> (PAGE_SHIFT - 12))
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#else
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#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
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#endif
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#endif
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/*
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* Provides information on the availiable set of ISA extensions to userspace,
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* via a bitmap that coorespends to each single-letter ISA extension. This is
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* essentially defunct, but will remain for compatibility with userspace.
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*/
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#define ELF_HWCAP riscv_get_elf_hwcap()
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extern unsigned long elf_hwcap;
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#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
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do { \
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(_r)->a1 = _exec_map_addr; \
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(_r)->a2 = _interp_map_addr; \
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(_r)->a3 = dynamic_addr; \
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} while (0)
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/*
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* This yields a string that ld.so will use to load implementation
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* specific libraries for optimization. This is more specific in
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* intent than poking at uname or /proc/cpuinfo.
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*/
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#define ELF_PLATFORM (NULL)
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#define COMPAT_ELF_PLATFORM (NULL)
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#define ARCH_DLINFO \
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do { \
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/* \
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* Note that we add ulong after elf_addr_t because \
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* casting current->mm->context.vdso triggers a cast \
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* warning of cast from pointer to integer for \
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* COMPAT ELFCLASS32. \
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*/ \
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NEW_AUX_ENT(AT_SYSINFO_EHDR, \
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(elf_addr_t)(ulong)current->mm->context.vdso); \
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NEW_AUX_ENT(AT_L1I_CACHESIZE, \
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get_cache_size(1, CACHE_TYPE_INST)); \
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NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY, \
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get_cache_geometry(1, CACHE_TYPE_INST)); \
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NEW_AUX_ENT(AT_L1D_CACHESIZE, \
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get_cache_size(1, CACHE_TYPE_DATA)); \
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NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY, \
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get_cache_geometry(1, CACHE_TYPE_DATA)); \
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NEW_AUX_ENT(AT_L2_CACHESIZE, \
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get_cache_size(2, CACHE_TYPE_UNIFIED)); \
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NEW_AUX_ENT(AT_L2_CACHEGEOMETRY, \
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get_cache_geometry(2, CACHE_TYPE_UNIFIED)); \
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NEW_AUX_ENT(AT_L3_CACHESIZE, \
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get_cache_size(3, CACHE_TYPE_UNIFIED)); \
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NEW_AUX_ENT(AT_L3_CACHEGEOMETRY, \
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get_cache_geometry(3, CACHE_TYPE_UNIFIED)); \
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/* \
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* Should always be nonzero unless there's a kernel bug. \
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* If we haven't determined a sensible value to give to \
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* userspace, omit the entry: \
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*/ \
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if (likely(signal_minsigstksz)) \
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NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
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else \
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NEW_AUX_ENT(AT_IGNORE, 0); \
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} while (0)
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#ifdef CONFIG_MMU
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
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struct linux_binprm;
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extern int arch_setup_additional_pages(struct linux_binprm *bprm,
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int uses_interp);
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#endif /* CONFIG_MMU */
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#define ELF_CORE_COPY_REGS(dest, regs) \
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do { \
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*(struct user_regs_struct *)&(dest) = \
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*(struct user_regs_struct *)regs; \
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} while (0);
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#ifdef CONFIG_COMPAT
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#define SET_PERSONALITY(ex) \
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do { if ((ex).e_ident[EI_CLASS] == ELFCLASS32) \
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set_thread_flag(TIF_32BIT); \
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else \
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clear_thread_flag(TIF_32BIT); \
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if (personality(current->personality) != PER_LINUX32) \
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set_personality(PER_LINUX | \
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(current->personality & (~PER_MASK))); \
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} while (0)
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#define COMPAT_ELF_ET_DYN_BASE ((TASK_SIZE_32 / 3) * 2)
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/* rv32 registers */
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typedef compat_ulong_t compat_elf_greg_t;
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typedef compat_elf_greg_t compat_elf_gregset_t[ELF_NGREG];
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extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
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int uses_interp);
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#define compat_arch_setup_additional_pages \
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compat_arch_setup_additional_pages
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#endif /* CONFIG_COMPAT */
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#endif /* _ASM_RISCV_ELF_H */
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