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411 lines
12 KiB
411 lines
12 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ASM_X86_ELF_H |
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#define _ASM_X86_ELF_H |
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/* |
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* ELF register definitions.. |
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*/ |
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#include <linux/thread_info.h> |
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#include <asm/ptrace.h> |
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#include <asm/user.h> |
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#include <asm/auxvec.h> |
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#include <asm/fsgsbase.h> |
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typedef unsigned long elf_greg_t; |
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#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t)) |
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typedef elf_greg_t elf_gregset_t[ELF_NGREG]; |
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typedef struct user_i387_struct elf_fpregset_t; |
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#ifdef __i386__ |
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#define R_386_NONE 0 |
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#define R_386_32 1 |
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#define R_386_PC32 2 |
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#define R_386_GOT32 3 |
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#define R_386_PLT32 4 |
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#define R_386_COPY 5 |
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#define R_386_GLOB_DAT 6 |
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#define R_386_JMP_SLOT 7 |
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#define R_386_RELATIVE 8 |
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#define R_386_GOTOFF 9 |
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#define R_386_GOTPC 10 |
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#define R_386_NUM 11 |
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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_CLASS ELFCLASS32 |
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#define ELF_DATA ELFDATA2LSB |
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#define ELF_ARCH EM_386 |
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#else |
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/* x86-64 relocation types */ |
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#define R_X86_64_NONE 0 /* No reloc */ |
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#define R_X86_64_64 1 /* Direct 64 bit */ |
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#define R_X86_64_PC32 2 /* PC relative 32 bit signed */ |
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#define R_X86_64_GOT32 3 /* 32 bit GOT entry */ |
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#define R_X86_64_PLT32 4 /* 32 bit PLT address */ |
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#define R_X86_64_COPY 5 /* Copy symbol at runtime */ |
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#define R_X86_64_GLOB_DAT 6 /* Create GOT entry */ |
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#define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */ |
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#define R_X86_64_RELATIVE 8 /* Adjust by program base */ |
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#define R_X86_64_GOTPCREL 9 /* 32 bit signed pc relative |
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offset to GOT */ |
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#define R_X86_64_32 10 /* Direct 32 bit zero extended */ |
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#define R_X86_64_32S 11 /* Direct 32 bit sign extended */ |
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#define R_X86_64_16 12 /* Direct 16 bit zero extended */ |
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#define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */ |
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#define R_X86_64_8 14 /* Direct 8 bit sign extended */ |
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#define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */ |
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#define R_X86_64_PC64 24 /* Place relative 64-bit signed */ |
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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_CLASS ELFCLASS64 |
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#define ELF_DATA ELFDATA2LSB |
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#define ELF_ARCH EM_X86_64 |
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#endif |
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#include <asm/vdso.h> |
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#ifdef CONFIG_X86_64 |
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extern unsigned int vdso64_enabled; |
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#endif |
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#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION) |
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extern unsigned int vdso32_enabled; |
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#endif |
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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_ia32(x) \ |
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(((x)->e_machine == EM_386) || ((x)->e_machine == EM_486)) |
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#include <asm/processor.h> |
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#ifdef CONFIG_X86_32 |
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#include <asm/desc.h> |
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#define elf_check_arch(x) elf_check_arch_ia32(x) |
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/* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx |
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contains a pointer to a function which might be registered using `atexit'. |
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This provides a mean for the dynamic linker to call DT_FINI functions for |
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shared libraries that have been loaded before the code runs. |
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A value of 0 tells we have no such handler. |
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We might as well make sure everything else is cleared too (except for %esp), |
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just to make things more deterministic. |
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*/ |
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#define ELF_PLAT_INIT(_r, load_addr) \ |
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do { \ |
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_r->bx = 0; _r->cx = 0; _r->dx = 0; \ |
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_r->si = 0; _r->di = 0; _r->bp = 0; \ |
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_r->ax = 0; \ |
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} while (0) |
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/* |
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* regs is struct pt_regs, pr_reg is elf_gregset_t (which is |
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* now struct_user_regs, they are different) |
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*/ |
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#define ELF_CORE_COPY_REGS_COMMON(pr_reg, regs) \ |
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do { \ |
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pr_reg[0] = regs->bx; \ |
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pr_reg[1] = regs->cx; \ |
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pr_reg[2] = regs->dx; \ |
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pr_reg[3] = regs->si; \ |
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pr_reg[4] = regs->di; \ |
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pr_reg[5] = regs->bp; \ |
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pr_reg[6] = regs->ax; \ |
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pr_reg[7] = regs->ds; \ |
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pr_reg[8] = regs->es; \ |
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pr_reg[9] = regs->fs; \ |
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pr_reg[11] = regs->orig_ax; \ |
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pr_reg[12] = regs->ip; \ |
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pr_reg[13] = regs->cs; \ |
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pr_reg[14] = regs->flags; \ |
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pr_reg[15] = regs->sp; \ |
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pr_reg[16] = regs->ss; \ |
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} while (0); |
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#define ELF_CORE_COPY_REGS(pr_reg, regs) \ |
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do { \ |
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ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\ |
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pr_reg[10] = get_user_gs(regs); \ |
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} while (0); |
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#define ELF_CORE_COPY_KERNEL_REGS(pr_reg, regs) \ |
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do { \ |
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ELF_CORE_COPY_REGS_COMMON(pr_reg, regs);\ |
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savesegment(gs, pr_reg[10]); \ |
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} while (0); |
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#define ELF_PLATFORM (utsname()->machine) |
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#define set_personality_64bit() do { } while (0) |
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#else /* CONFIG_X86_32 */ |
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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) \ |
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((x)->e_machine == EM_X86_64) |
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#define compat_elf_check_arch(x) \ |
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(elf_check_arch_ia32(x) || \ |
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(IS_ENABLED(CONFIG_X86_X32_ABI) && (x)->e_machine == EM_X86_64)) |
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#if __USER32_DS != __USER_DS |
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# error "The following code assumes __USER32_DS == __USER_DS" |
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#endif |
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static inline void elf_common_init(struct thread_struct *t, |
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struct pt_regs *regs, const u16 ds) |
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{ |
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/* ax gets execve's return value. */ |
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/*regs->ax = */ regs->bx = regs->cx = regs->dx = 0; |
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regs->si = regs->di = regs->bp = 0; |
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regs->r8 = regs->r9 = regs->r10 = regs->r11 = 0; |
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regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; |
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t->fsbase = t->gsbase = 0; |
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t->fsindex = t->gsindex = 0; |
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t->ds = t->es = ds; |
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} |
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#define ELF_PLAT_INIT(_r, load_addr) \ |
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elf_common_init(¤t->thread, _r, 0) |
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#define COMPAT_ELF_PLAT_INIT(regs, load_addr) \ |
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elf_common_init(¤t->thread, regs, __USER_DS) |
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void compat_start_thread(struct pt_regs *regs, u32 new_ip, u32 new_sp, bool x32); |
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#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ |
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compat_start_thread(regs, new_ip, new_sp, ex->e_machine == EM_X86_64) |
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void set_personality_ia32(bool); |
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#define COMPAT_SET_PERSONALITY(ex) \ |
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set_personality_ia32((ex).e_machine == EM_X86_64) |
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#define COMPAT_ELF_PLATFORM ("i686") |
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/* |
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* regs is struct pt_regs, pr_reg is elf_gregset_t (which is |
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* now struct_user_regs, they are different). Assumes current is the process |
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* getting dumped. |
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*/ |
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#define ELF_CORE_COPY_REGS(pr_reg, regs) \ |
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do { \ |
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unsigned v; \ |
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(pr_reg)[0] = (regs)->r15; \ |
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(pr_reg)[1] = (regs)->r14; \ |
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(pr_reg)[2] = (regs)->r13; \ |
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(pr_reg)[3] = (regs)->r12; \ |
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(pr_reg)[4] = (regs)->bp; \ |
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(pr_reg)[5] = (regs)->bx; \ |
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(pr_reg)[6] = (regs)->r11; \ |
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(pr_reg)[7] = (regs)->r10; \ |
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(pr_reg)[8] = (regs)->r9; \ |
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(pr_reg)[9] = (regs)->r8; \ |
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(pr_reg)[10] = (regs)->ax; \ |
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(pr_reg)[11] = (regs)->cx; \ |
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(pr_reg)[12] = (regs)->dx; \ |
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(pr_reg)[13] = (regs)->si; \ |
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(pr_reg)[14] = (regs)->di; \ |
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(pr_reg)[15] = (regs)->orig_ax; \ |
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(pr_reg)[16] = (regs)->ip; \ |
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(pr_reg)[17] = (regs)->cs; \ |
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(pr_reg)[18] = (regs)->flags; \ |
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(pr_reg)[19] = (regs)->sp; \ |
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(pr_reg)[20] = (regs)->ss; \ |
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(pr_reg)[21] = x86_fsbase_read_cpu(); \ |
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(pr_reg)[22] = x86_gsbase_read_cpu_inactive(); \ |
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asm("movl %%ds,%0" : "=r" (v)); (pr_reg)[23] = v; \ |
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asm("movl %%es,%0" : "=r" (v)); (pr_reg)[24] = v; \ |
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asm("movl %%fs,%0" : "=r" (v)); (pr_reg)[25] = v; \ |
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asm("movl %%gs,%0" : "=r" (v)); (pr_reg)[26] = v; \ |
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} while (0); |
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/* I'm not sure if we can use '-' here */ |
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#define ELF_PLATFORM ("x86_64") |
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extern void set_personality_64bit(void); |
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extern unsigned int sysctl_vsyscall32; |
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extern int force_personality32; |
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#endif /* !CONFIG_X86_32 */ |
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#define CORE_DUMP_USE_REGSET |
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#define ELF_EXEC_PAGESIZE 4096 |
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/* |
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* This is the base location for PIE (ET_DYN with INTERP) loads. On |
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* 64-bit, this is above 4GB to leave the entire 32-bit address |
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* space open for things that want to use the area for 32-bit pointers. |
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*/ |
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#define ELF_ET_DYN_BASE (mmap_is_ia32() ? 0x000400000UL : \ |
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(DEFAULT_MAP_WINDOW / 3 * 2)) |
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/* This yields a mask that user programs can use to figure out what |
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instruction set this CPU supports. This could be done in user space, |
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but it's not easy, and we've already done it here. */ |
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#define ELF_HWCAP (boot_cpu_data.x86_capability[CPUID_1_EDX]) |
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extern u32 elf_hwcap2; |
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/* |
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* HWCAP2 supplies mask with kernel enabled CPU features, so that |
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* the application can discover that it can safely use them. |
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* The bits are defined in uapi/asm/hwcap2.h. |
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*/ |
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#define ELF_HWCAP2 (elf_hwcap2) |
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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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For the moment, we have only optimizations for the Intel generations, |
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but that could change... */ |
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#define SET_PERSONALITY(ex) set_personality_64bit() |
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/* |
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* An executable for which elf_read_implies_exec() returns TRUE will |
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* have the READ_IMPLIES_EXEC personality flag set automatically. |
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* |
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* The decision process for determining the results are: |
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* |
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* CPU: | lacks NX* | has NX, ia32 | has NX, x86_64 | |
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* ELF: | | | | |
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* ---------------------|------------|------------------|----------------| |
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* missing PT_GNU_STACK | exec-all | exec-all | exec-none | |
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* PT_GNU_STACK == RWX | exec-stack | exec-stack | exec-stack | |
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* PT_GNU_STACK == RW | exec-none | exec-none | exec-none | |
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* |
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* exec-all : all PROT_READ user mappings are executable, except when |
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* backed by files on a noexec-filesystem. |
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* exec-none : only PROT_EXEC user mappings are executable. |
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* exec-stack: only the stack and PROT_EXEC user mappings are executable. |
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* |
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* *this column has no architectural effect: NX markings are ignored by |
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* hardware, but may have behavioral effects when "wants X" collides with |
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* "cannot be X" constraints in memory permission flags, as in |
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* https://lkml.kernel.org/r/[email protected] |
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* |
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*/ |
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#define elf_read_implies_exec(ex, executable_stack) \ |
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(mmap_is_ia32() && executable_stack == EXSTACK_DEFAULT) |
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struct task_struct; |
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#define ARCH_DLINFO_IA32 \ |
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do { \ |
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if (VDSO_CURRENT_BASE) { \ |
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NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY); \ |
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NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE); \ |
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} \ |
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NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ |
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} while (0) |
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/* |
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* True on X86_32 or when emulating IA32 on X86_64 |
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*/ |
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static inline int mmap_is_ia32(void) |
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{ |
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return IS_ENABLED(CONFIG_X86_32) || |
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(IS_ENABLED(CONFIG_COMPAT) && |
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test_thread_flag(TIF_ADDR32)); |
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} |
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extern unsigned long task_size_32bit(void); |
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extern unsigned long task_size_64bit(int full_addr_space); |
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extern unsigned long get_mmap_base(int is_legacy); |
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extern bool mmap_address_hint_valid(unsigned long addr, unsigned long len); |
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extern unsigned long get_sigframe_size(void); |
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#ifdef CONFIG_X86_32 |
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#define __STACK_RND_MASK(is32bit) (0x7ff) |
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#define STACK_RND_MASK (0x7ff) |
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#define ARCH_DLINFO ARCH_DLINFO_IA32 |
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/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ |
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#else /* CONFIG_X86_32 */ |
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/* 1GB for 64bit, 8MB for 32bit */ |
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#define __STACK_RND_MASK(is32bit) ((is32bit) ? 0x7ff : 0x3fffff) |
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#define STACK_RND_MASK __STACK_RND_MASK(mmap_is_ia32()) |
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#define ARCH_DLINFO \ |
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do { \ |
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if (vdso64_enabled) \ |
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NEW_AUX_ENT(AT_SYSINFO_EHDR, \ |
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(unsigned long __force)current->mm->context.vdso); \ |
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NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ |
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} while (0) |
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/* As a historical oddity, the x32 and x86_64 vDSOs are controlled together. */ |
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#define ARCH_DLINFO_X32 \ |
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do { \ |
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if (vdso64_enabled) \ |
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NEW_AUX_ENT(AT_SYSINFO_EHDR, \ |
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(unsigned long __force)current->mm->context.vdso); \ |
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NEW_AUX_ENT(AT_MINSIGSTKSZ, get_sigframe_size()); \ |
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} while (0) |
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#define AT_SYSINFO 32 |
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#define COMPAT_ARCH_DLINFO \ |
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if (exec->e_machine == EM_X86_64) \ |
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ARCH_DLINFO_X32; \ |
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else if (IS_ENABLED(CONFIG_IA32_EMULATION)) \ |
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ARCH_DLINFO_IA32 |
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#define COMPAT_ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x1000000) |
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#endif /* !CONFIG_X86_32 */ |
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#define VDSO_CURRENT_BASE ((unsigned long)current->mm->context.vdso) |
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#define VDSO_ENTRY \ |
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((unsigned long)current->mm->context.vdso + \ |
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vdso_image_32.sym___kernel_vsyscall) |
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struct linux_binprm; |
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#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
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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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extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm, |
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int uses_interp, bool x32); |
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#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ |
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compat_arch_setup_additional_pages(bprm, interpreter, \ |
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(ex->e_machine == EM_X86_64)) |
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extern bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs); |
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/* Do not change the values. See get_align_mask() */ |
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enum align_flags { |
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ALIGN_VA_32 = BIT(0), |
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ALIGN_VA_64 = BIT(1), |
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}; |
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struct va_alignment { |
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int flags; |
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unsigned long mask; |
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unsigned long bits; |
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} ____cacheline_aligned; |
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extern struct va_alignment va_align; |
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extern unsigned long align_vdso_addr(unsigned long); |
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#endif /* _ASM_X86_ELF_H */
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