| 1 | #ifndef _LINUX_LINKAGE_H
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| 2 | #define _LINUX_LINKAGE_H
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| 3 |
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| 4 | #include <linux/compiler.h>
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| 5 | #include <linux/stringify.h>
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| 6 | #include <linux/export.h>
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| 7 | #include <asm/linkage.h>
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| 8 |
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| 9 | #ifdef __cplusplus
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| 10 | #define CPP_ASMLINKAGE extern "C"
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| 11 | #else
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| 12 | #define CPP_ASMLINKAGE
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| 13 | #endif
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| 14 |
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| 15 | #ifndef asmlinkage
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| 16 | #define asmlinkage CPP_ASMLINKAGE
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| 17 | #endif
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| 18 |
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| 19 | #ifndef cond_syscall
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| 20 | #define cond_syscall(x) asm( \
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| 21 | ".weak " VMLINUX_SYMBOL_STR(x) "\n\t" \
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| 22 | ".set " VMLINUX_SYMBOL_STR(x) "," \
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| 23 | VMLINUX_SYMBOL_STR(sys_ni_syscall))
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| 24 | #endif
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| 25 |
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| 26 | #ifndef SYSCALL_ALIAS
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| 27 | #define SYSCALL_ALIAS(alias, name) asm( \
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| 28 | ".globl " VMLINUX_SYMBOL_STR(alias) "\n\t" \
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| 29 | ".set " VMLINUX_SYMBOL_STR(alias) "," \
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| 30 | VMLINUX_SYMBOL_STR(name))
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| 31 | #endif
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| 32 |
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| 33 | #define __page_aligned_data __section(.data..page_aligned) __aligned(PAGE_SIZE)
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| 34 | #define __page_aligned_bss __section(.bss..page_aligned) __aligned(PAGE_SIZE)
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| 35 |
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| 36 | |
| 37 | * For assembly routines.
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| 38 | *
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| 39 | * Note when using these that you must specify the appropriate
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| 40 | * alignment directives yourself
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| 41 |
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| 42 | #define __PAGE_ALIGNED_DATA .section ".data..page_aligned", "aw"
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| 43 | #define __PAGE_ALIGNED_BSS .section ".bss..page_aligned", "aw"
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| 44 |
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| 45 | |
| 46 | * This is used by architectures to keep arguments on the stack
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| 47 | * untouched by the compiler by keeping them live until the end.
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| 48 | * The argument stack may be owned by the assembly-language
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| 49 | * caller, not the callee, and gcc doesn't always understand
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| 50 | * that.
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| 51 | *
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| 52 | * We have the return value, and a maximum of six arguments.
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| 53 | *
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| 54 | * This should always be followed by a "return ret" for the
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| 55 | * protection to work (ie no more work that the compiler might
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| 56 | * end up needing stack temporaries for).
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| 57 |
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| 58 |
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| 59 | #ifndef __ASSEMBLY__
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| 60 | #ifndef asmlinkage_protect
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| 61 | # define asmlinkage_protect(n, ret, args...) do { } while (0)
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| 62 | #endif
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| 63 | #endif
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| 64 |
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| 65 | #ifndef __ALIGN
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| 66 | #define __ALIGN .align 4,0x90
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| 67 | #define __ALIGN_STR ".align 4,0x90"
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| 68 | #endif
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| 69 |
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| 70 | #ifdef __ASSEMBLY__
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| 71 |
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| 72 | #ifndef LINKER_SCRIPT
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| 73 | #define ALIGN __ALIGN
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| 74 | #define ALIGN_STR __ALIGN_STR
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| 75 |
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| 76 | #ifndef ENTRY
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| 77 | #define ENTRY(name) \
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| 78 | .globl name; \
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| 79 | ALIGN; \
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| 80 | name:
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| 81 | #endif
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| 82 | #endif
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| 83 |
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| 84 | #ifndef WEAK
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| 85 | #define WEAK(name) \
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| 86 | .weak name; \
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| 87 | name:
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| 88 | #endif
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| 89 |
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| 90 | #ifndef END
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| 91 | #define END(name) \
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| 92 | .size name, .-name
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| 93 | #endif
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| 94 |
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| 95 | |
| 96 | * then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
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| 97 | * static analysis tools such as stack depth analyzer.
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| 98 |
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| 99 | #ifndef ENDPROC
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| 100 | #define ENDPROC(name) \
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| 101 | .type name, @function; \
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| 102 | END(name)
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| 103 | #endif
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| 104 |
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| 105 | #endif
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| 106 |
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| 107 | #endif
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