| 1 | |
| 2 | |
| 3 | * Author: Hanlu Li <[email protected]>
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| 4 | * Huacai Chen <[email protected]>
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| 5 | *
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| 6 | * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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| 7 |
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| 8 | #include <linux/capability.h>
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| 9 | #include <linux/entry-common.h>
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| 10 | #include <linux/errno.h>
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| 11 | #include <linux/linkage.h>
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| 12 | #include <linux/nospec.h>
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| 13 | #include <linux/objtool.h>
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| 14 | #include <linux/syscalls.h>
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| 15 | #include <linux/unistd.h>
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| 16 |
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| 17 | #include <asm/asm.h>
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| 18 | #include <asm/exception.h>
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| 19 | #include <asm/loongarch.h>
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| 20 | #include <asm/signal.h>
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| 21 | #include <asm/switch_to.h>
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| 22 | #include <asm-generic/syscalls.h>
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| 23 |
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| 24 | #undef __SYSCALL
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| 25 | #define __SYSCALL(nr, call) [nr] = (call),
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| 26 | #define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native)
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| 27 |
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| 28 | SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, unsigned long,
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| 29 | prot, unsigned long, flags, unsigned long, fd, unsigned long, offset)
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| 30 | {
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| 31 | if (offset & ~PAGE_MASK)
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| 32 | return -EINVAL;
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| 33 |
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| 34 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
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| 35 | }
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| 36 |
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| 37 | SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, unsigned long,
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| 38 | prot, unsigned long, flags, unsigned long, fd, unsigned long, offset)
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| 39 | {
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| 40 | if (offset & (~PAGE_MASK >> 12))
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| 41 | return -EINVAL;
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| 42 |
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| 43 | return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> (PAGE_SHIFT - 12));
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| 44 | }
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| 45 |
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| 46 | void *sys_call_table[__NR_syscalls] = {
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| 47 | [0 ... __NR_syscalls - 1] = sys_ni_syscall,
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| 48 | #ifdef CONFIG_32BIT
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| 49 | #include <asm/syscall_table_32.h>
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| 50 | #else
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| 51 | #include <asm/syscall_table_64.h>
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| 52 | #endif
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| 53 | };
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| 54 |
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| 55 | typedef long (*sys_call_fn)(unsigned long, unsigned long,
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| 56 | unsigned long, unsigned long, unsigned long, unsigned long);
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| 57 |
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| 58 | void noinstr __no_stack_protector do_syscall(struct pt_regs *regs)
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| 59 | {
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| 60 | sys_call_fn syscall_fn;
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| 61 | unsigned long nr;
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| 62 |
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| 63 | nr = regs->regs[11];
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| 64 |
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| 65 | if (nr < NR_syscalls)
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| 66 | regs->regs[0] = nr + 1;
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| 67 |
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| 68 | regs->csr_era += 4;
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| 69 | regs->orig_a0 = regs->regs[4];
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| 70 | regs->regs[4] = -ENOSYS;
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| 71 |
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| 72 | if (likely(syscall_enter_from_user_mode_randomize_stack(regs, &nr))) {
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| 73 | if (nr < NR_syscalls) {
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| 74 | syscall_fn = sys_call_table[array_index_nospec(nr, NR_syscalls)];
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| 75 | regs->regs[4] = syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6],
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| 76 | regs->regs[7], regs->regs[8], regs->regs[9]);
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| 77 | }
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| 78 | }
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| 79 |
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| 80 | syscall_exit_to_user_mode(regs);
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| 81 | }
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