1 /* 2 * System call table for UML/x86-64, copied from arch/x86_64/kernel/syscall.c 3 * with some changes for UML. 4 */ 5 6 #include <linux/linkage.h> 7 #include <linux/sys.h> 8 #include <linux/cache.h> 9 10 #define __NO_STUBS 11 12 /* 13 * Below you can see, in terms of #define's, the differences between the x86-64 14 * and the UML syscall table. 15 */ 16 17 /* Not going to be implemented by UML, since we have no hardware. */ 18 #define stub_iopl sys_ni_syscall 19 #define sys_ioperm sys_ni_syscall 20 21 /* 22 * The UML TLS problem. Note that x86_64 does not implement this, so the below 23 * is needed only for the ia32 compatibility. 24 */ 25 26 /* On UML we call it this way ("old" means it's not mmap2) */ 27 #define sys_mmap old_mmap 28 29 #define stub_clone sys_clone 30 #define stub_fork sys_fork 31 #define stub_vfork sys_vfork 32 #define stub_execve sys_execve 33 #define stub_rt_sigsuspend sys_rt_sigsuspend 34 #define stub_sigaltstack sys_sigaltstack 35 #define stub_rt_sigreturn sys_rt_sigreturn 36 37 #define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ; 38 #undef _ASM_X86_UNISTD_64_H 39 #include "../../x86/include/asm/unistd_64.h" 40 41 #undef __SYSCALL 42 #define __SYSCALL(nr, sym) [ nr ] = sym, 43 #undef _ASM_X86_UNISTD_64_H 44 45 typedef void (*sys_call_ptr_t)(void); 46 47 extern void sys_ni_syscall(void); 48 49 /* 50 * We used to have a trick here which made sure that holes in the 51 * x86_64 table were filled in with sys_ni_syscall, but a comment in 52 * unistd_64.h says that holes aren't allowed, so the trick was 53 * removed. 54 * The trick looked like this 55 * [0 ... UM_NR_syscall_max] = &sys_ni_syscall 56 * before including unistd_64.h - the later initializations overwrote 57 * the sys_ni_syscall filler. 58 */ 59 60 sys_call_ptr_t sys_call_table[] __cacheline_aligned = { 61 #include <asm/unistd_64.h> 62 }; 63 64 int syscall_table_size = sizeof(sys_call_table); 65