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f87ea91d98
Redo the calculation of NR_syscalls since that disappeared from i386 and use a similar mechanism on x86_64. We now figure out the size of the system call table in arch code and stick that in syscall_table_size. arch/um/kernel/skas/syscall.c defines NR_syscalls in terms of that since its the only thing that needs to know how many system calls there are. The old mechananism that was used on x86_64 is gone. arch/um/include/sysdep-i386/syscalls.h got some formatting since I was looking at it. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* System call table for UML/x86-64, copied from arch/x86_64/kernel/syscall.c
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* with some changes for UML.
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*/
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#include <linux/linkage.h>
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#include <linux/sys.h>
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#include <linux/cache.h>
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#include <kern_constants.h>
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#define __NO_STUBS
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/*
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* Below you can see, in terms of #define's, the differences between the x86-64
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* and the UML syscall table.
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*/
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/* Not going to be implemented by UML, since we have no hardware. */
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#define stub_iopl sys_ni_syscall
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#define sys_ioperm sys_ni_syscall
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/*
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* The UML TLS problem. Note that x86_64 does not implement this, so the below
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* is needed only for the ia32 compatibility.
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*/
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/* On UML we call it this way ("old" means it's not mmap2) */
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#define sys_mmap old_mmap
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/*
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* On x86-64 sys_uname is actually sys_newuname plus a compatibility trick.
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* See arch/x86_64/kernel/sys_x86_64.c
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*/
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#define sys_uname sys_uname64
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#define stub_clone sys_clone
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#define stub_fork sys_fork
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#define stub_vfork sys_vfork
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#define stub_execve sys_execve
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#define stub_rt_sigsuspend sys_rt_sigsuspend
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#define stub_sigaltstack sys_sigaltstack
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#define stub_rt_sigreturn sys_rt_sigreturn
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#define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
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#undef _ASM_X86_64_UNISTD_H_
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#include <asm-x86/unistd_64.h>
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#undef __SYSCALL
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#define __SYSCALL(nr, sym) [ nr ] = sym,
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#undef _ASM_X86_64_UNISTD_H_
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typedef void (*sys_call_ptr_t)(void);
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extern void sys_ni_syscall(void);
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/*
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* We used to have a trick here which made sure that holes in the
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* x86_64 table were filled in with sys_ni_syscall, but a comment in
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* unistd_64.h says that holes aren't allowed, so the trick was
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* removed.
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* The trick looked like this
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* [0 ... UM_NR_syscall_max] = &sys_ni_syscall
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* before including unistd_64.h - the later initializations overwrote
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* the sys_ni_syscall filler.
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*/
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sys_call_ptr_t sys_call_table[] __cacheline_aligned = {
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#include <asm-x86/unistd_64.h>
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};
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int syscall_table_size = sizeof(sys_call_table);
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