| 1 | |
| 2 | |
| 3 | * sys_ppc32.c: 32-bit system calls with complex calling conventions.
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| 4 | *
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| 5 | * Copyright (C) 2001 IBM
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| 6 | * Copyright (C) 1997,1998 Jakub Jelinek ([email protected])
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| 7 | * Copyright (C) 1997 David S. Miller ([email protected])
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| 8 | *
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| 9 | * 32-bit system calls with 64-bit arguments pass those in register pairs.
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| 10 | * This must be specially dealt with on 64-bit kernels. The compat_arg_u64_dual
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| 11 | * in generic compat syscalls is not always usable because the register
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| 12 | * pairing is constrained depending on preceding arguments.
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| 13 | *
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| 14 | * An analogous problem exists on 32-bit kernels with ARCH_HAS_SYSCALL_WRAPPER,
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| 15 | * the defined system call functions take the pt_regs as an argument, and there
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| 16 | * is a mapping macro which maps registers to arguments
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| 17 | * (SC_POWERPC_REGS_TO_ARGS) which also does not deal with these 64-bit
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| 18 | * arguments.
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| 19 | *
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| 20 | * This file contains these system calls.
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| 21 |
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| 22 |
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| 23 | #include <linux/kernel.h>
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| 24 | #include <linux/sched.h>
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| 25 | #include <linux/fs.h>
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| 26 | #include <linux/mm.h>
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| 27 | #include <linux/file.h>
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| 28 | #include <linux/signal.h>
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| 29 | #include <linux/resource.h>
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| 30 | #include <linux/times.h>
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| 31 | #include <linux/smp.h>
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| 32 | #include <linux/sem.h>
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| 33 | #include <linux/msg.h>
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| 34 | #include <linux/shm.h>
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| 35 | #include <linux/poll.h>
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| 36 | #include <linux/personality.h>
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| 37 | #include <linux/stat.h>
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| 38 | #include <linux/in.h>
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| 39 | #include <linux/syscalls.h>
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| 40 | #include <linux/unistd.h>
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| 41 | #include <linux/sysctl.h>
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| 42 | #include <linux/binfmts.h>
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| 43 | #include <linux/security.h>
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| 44 | #include <linux/compat.h>
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| 45 | #include <linux/ptrace.h>
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| 46 | #include <linux/elf.h>
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| 47 | #include <linux/ipc.h>
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| 48 | #include <linux/slab.h>
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| 49 |
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| 50 | #include <asm/ptrace.h>
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| 51 | #include <asm/types.h>
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| 52 | #include <linux/uaccess.h>
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| 53 | #include <asm/unistd.h>
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| 54 | #include <asm/time.h>
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| 55 | #include <asm/mmu_context.h>
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| 56 | #include <asm/ppc-pci.h>
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| 57 | #include <asm/syscalls.h>
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| 58 | #include <asm/switch_to.h>
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| 59 |
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| 60 | #ifdef CONFIG_PPC32
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| 61 | #define PPC32_SYSCALL_DEFINE4 SYSCALL_DEFINE4
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| 62 | #define PPC32_SYSCALL_DEFINE5 SYSCALL_DEFINE5
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| 63 | #define PPC32_SYSCALL_DEFINE6 SYSCALL_DEFINE6
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| 64 | #else
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| 65 | #define PPC32_SYSCALL_DEFINE4 COMPAT_SYSCALL_DEFINE4
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| 66 | #define PPC32_SYSCALL_DEFINE5 COMPAT_SYSCALL_DEFINE5
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| 67 | #define PPC32_SYSCALL_DEFINE6 COMPAT_SYSCALL_DEFINE6
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| 68 | #endif
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| 69 |
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| 70 | PPC32_SYSCALL_DEFINE6(ppc_pread64,
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| 71 | unsigned int, fd,
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| 72 | char __user *, ubuf, compat_size_t, count,
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| 73 | u32, reg6, u32, pos1, u32, pos2)
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| 74 | {
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| 75 | return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
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| 76 | }
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| 77 |
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| 78 | PPC32_SYSCALL_DEFINE6(ppc_pwrite64,
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| 79 | unsigned int, fd,
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| 80 | const char __user *, ubuf, compat_size_t, count,
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| 81 | u32, reg6, u32, pos1, u32, pos2)
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| 82 | {
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| 83 | return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
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| 84 | }
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| 85 |
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| 86 | PPC32_SYSCALL_DEFINE5(ppc_readahead,
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| 87 | int, fd, u32, r4,
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| 88 | u32, offset1, u32, offset2, u32, count)
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| 89 | {
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| 90 | return ksys_readahead(fd, merge_64(offset1, offset2), count);
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| 91 | }
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| 92 |
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| 93 | PPC32_SYSCALL_DEFINE4(ppc_truncate64,
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| 94 | const char __user *, path, u32, reg4,
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| 95 | unsigned long, len1, unsigned long, len2)
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| 96 | {
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| 97 | return ksys_truncate(path, merge_64(len1, len2));
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| 98 | }
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| 99 |
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| 100 | PPC32_SYSCALL_DEFINE4(ppc_ftruncate64,
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| 101 | unsigned int, fd, u32, reg4,
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| 102 | unsigned long, len1, unsigned long, len2)
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| 103 | {
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| 104 | return ksys_ftruncate(fd, merge_64(len1, len2), FTRUNCATE_LFS);
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| 105 | }
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| 106 |
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| 107 | PPC32_SYSCALL_DEFINE6(ppc32_fadvise64,
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| 108 | int, fd, u32, unused, u32, offset1, u32, offset2,
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| 109 | size_t, len, int, advice)
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| 110 | {
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| 111 | return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len,
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| 112 | advice);
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| 113 | }
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| 114 |
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| 115 | PPC32_SYSCALL_DEFINE6(ppc_sync_file_range2,
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| 116 | int, fd, unsigned int, flags,
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| 117 | unsigned int, offset1, unsigned int, offset2,
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| 118 | unsigned int, nbytes1, unsigned int, nbytes2)
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| 119 | {
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| 120 | loff_t offset = merge_64(offset1, offset2);
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| 121 | loff_t nbytes = merge_64(nbytes1, nbytes2);
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| 122 |
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| 123 | return ksys_sync_file_range(fd, offset, nbytes, flags);
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| 124 | }
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| 125 |
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| 126 | #ifdef CONFIG_PPC32
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| 127 | SYSCALL_DEFINE6(ppc_fallocate,
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| 128 | int, fd, int, mode,
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| 129 | u32, offset1, u32, offset2, u32, len1, u32, len2)
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| 130 | {
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| 131 | return ksys_fallocate(fd, mode,
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| 132 | merge_64(offset1, offset2),
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| 133 | merge_64(len1, len2));
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| 134 | }
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| 135 | #endif
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