42f29a2520
Adding a reference to <linux/linkage.h> to x86's <asm/cache.h> causes the x86 linker script to have syntax errors, because the ALIGN and ENTRY keywords get redefined to the assembly implementations of those. One could fix this by adjusting the include structure, but I think any solution based on that approach would be fragile. Currently, it is impossible when writing a header to do something different for assembly files and linker scripts, even though there are clearly cases where one wants them to define macros differently for the two (ENTRY being an excellent example). So I think the right solution here is to introduce a new preprocessor definition, called LINKER_SCRIPT that is set along with __ASSEMBLY__ for linker scripts, and to use that to not define ALIGN and ENTRY in linker scripts. I suspect we'll find other uses for this mechanism in the future. Signed-off-by: Tim Abbott <tabbott@ksplice.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
#ifndef _LINUX_LINKAGE_H
|
|
#define _LINUX_LINKAGE_H
|
|
|
|
#include <linux/compiler.h>
|
|
#include <asm/linkage.h>
|
|
|
|
#ifdef __cplusplus
|
|
#define CPP_ASMLINKAGE extern "C"
|
|
#else
|
|
#define CPP_ASMLINKAGE
|
|
#endif
|
|
|
|
#ifndef asmlinkage
|
|
#define asmlinkage CPP_ASMLINKAGE
|
|
#endif
|
|
|
|
#ifndef asmregparm
|
|
# define asmregparm
|
|
#endif
|
|
|
|
#define __page_aligned_data __section(.data.page_aligned) __aligned(PAGE_SIZE)
|
|
#define __page_aligned_bss __section(.bss.page_aligned) __aligned(PAGE_SIZE)
|
|
|
|
/*
|
|
* For assembly routines.
|
|
*
|
|
* Note when using these that you must specify the appropriate
|
|
* alignment directives yourself
|
|
*/
|
|
#define __PAGE_ALIGNED_DATA .section ".data.page_aligned", "aw"
|
|
#define __PAGE_ALIGNED_BSS .section ".bss.page_aligned", "aw"
|
|
|
|
/*
|
|
* This is used by architectures to keep arguments on the stack
|
|
* untouched by the compiler by keeping them live until the end.
|
|
* The argument stack may be owned by the assembly-language
|
|
* caller, not the callee, and gcc doesn't always understand
|
|
* that.
|
|
*
|
|
* We have the return value, and a maximum of six arguments.
|
|
*
|
|
* This should always be followed by a "return ret" for the
|
|
* protection to work (ie no more work that the compiler might
|
|
* end up needing stack temporaries for).
|
|
*/
|
|
/* Assembly files may be compiled with -traditional .. */
|
|
#ifndef __ASSEMBLY__
|
|
#ifndef asmlinkage_protect
|
|
# define asmlinkage_protect(n, ret, args...) do { } while (0)
|
|
#endif
|
|
#endif
|
|
|
|
#ifndef __ALIGN
|
|
#define __ALIGN .align 4,0x90
|
|
#define __ALIGN_STR ".align 4,0x90"
|
|
#endif
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
#ifndef LINKER_SCRIPT
|
|
#define ALIGN __ALIGN
|
|
#define ALIGN_STR __ALIGN_STR
|
|
|
|
#ifndef ENTRY
|
|
#define ENTRY(name) \
|
|
.globl name; \
|
|
ALIGN; \
|
|
name:
|
|
#endif
|
|
#endif /* LINKER_SCRIPT */
|
|
|
|
#ifndef WEAK
|
|
#define WEAK(name) \
|
|
.weak name; \
|
|
name:
|
|
#endif
|
|
|
|
#ifndef END
|
|
#define END(name) \
|
|
.size name, .-name
|
|
#endif
|
|
|
|
/* If symbol 'name' is treated as a subroutine (gets called, and returns)
|
|
* then please use ENDPROC to mark 'name' as STT_FUNC for the benefit of
|
|
* static analysis tools such as stack depth analyzer.
|
|
*/
|
|
#ifndef ENDPROC
|
|
#define ENDPROC(name) \
|
|
.type name, @function; \
|
|
END(name)
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#define NORET_TYPE /**/
|
|
#define ATTRIB_NORET __attribute__((noreturn))
|
|
#define NORET_AND noreturn,
|
|
|
|
#endif
|