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 #include <kern_constants.h> 10 11 #define __NO_STUBS 12 13 /* 14 * Below you can see, in terms of #define's, the differences between the x86-64 15 * and the UML syscall table. 16 */ 17 18 /* Not going to be implemented by UML, since we have no hardware. */ 19 #define stub_iopl sys_ni_syscall 20 #define sys_ioperm sys_ni_syscall 21 22 /* 23 * The UML TLS problem. Note that x86_64 does not implement this, so the below 24 * is needed only for the ia32 compatibility. 25 */ 26 27 /* On UML we call it this way ("old" means it's not mmap2) */ 28 #define sys_mmap old_mmap 29 /* 30 * On x86-64 sys_uname is actually sys_newuname plus a compatibility trick. 31 * See arch/x86_64/kernel/sys_x86_64.c 32 */ 33 #define sys_uname sys_uname64 34 35 #define stub_clone sys_clone 36 #define stub_fork sys_fork 37 #define stub_vfork sys_vfork 38 #define stub_execve sys_execve 39 #define stub_rt_sigsuspend sys_rt_sigsuspend 40 #define stub_sigaltstack sys_sigaltstack 41 #define stub_rt_sigreturn sys_rt_sigreturn 42 43 #define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ; 44 #undef _ASM_X86_UNISTD_64_H 45 #include "../../x86/include/asm/unistd_64.h" 46 47 #undef __SYSCALL 48 #define __SYSCALL(nr, sym) [ nr ] = sym, 49 #undef _ASM_X86_UNISTD_64_H 50 51 typedef void (*sys_call_ptr_t)(void); 52 53 extern void sys_ni_syscall(void); 54 55 /* 56 * We used to have a trick here which made sure that holes in the 57 * x86_64 table were filled in with sys_ni_syscall, but a comment in 58 * unistd_64.h says that holes aren't allowed, so the trick was 59 * removed. 60 * The trick looked like this 61 * [0 ... UM_NR_syscall_max] = &sys_ni_syscall 62 * before including unistd_64.h - the later initializations overwrote 63 * the sys_ni_syscall filler. 64 */ 65 66 sys_call_ptr_t sys_call_table[] __cacheline_aligned = { 67 #include "../../x86/include/asm/unistd_64.h" 68 }; 69 70 int syscall_table_size = sizeof(sys_call_table); 71