1$NetBSD: README.mach-traps,v 1.3 2001/06/04 20:06:41 nathanw Exp $ 2 3Some Alpha AXP OSF/1 binaries directly use the facilities provided by 4the Mach kernel that is the basis for OSF/1. These include (but are 5surely not limited to) 'dd', 'ps', and 'w'. 6 7Invariably, the symptom that these binaries display is that they crash 8with an "unimplemented system call" trap (SIGSYS signal) for a syscall 9that has a negative number. In general, binaries that use the Mach 10syscalls appear to invoke task_self() as their first syscall. 11 12Note that system call numbers are now range-bounded by masking off the 13high bits, so negative system call numbers will appear in the high 14end of the system call number range, thanks to the wonders of two's 15compliment arithmetic. System call -10, for example, will appear as 16"CALL [502]" in kdump output. 17 18The name, number, and number of arguments for each Mach syscall is 19given below; this information was gleaned by looking through the OSF/1 20libmach.a's object files with dbx, then double-checked against the 21contents of OSF/1's <mach/syscall_sw.h>. 22 23These calls would be very difficult to implement properly in the 24OSF/1 emulation code; by its very nature, NetBSD is not Mach, and we 25don't and can't provide the underlying facilities that it does. 26 27-- cgd 28 29trap name number nargs notes 30---- ---- ------ ----- ----- 31task_self -10 0 32thread_reply -11 0 33task_notify -12 0 34thread_self -13 0 35msg_send_old -14 3 36msg_receive_old -15 3 37msg_rpc_old -16 5 38msg_send_trap -20 4 39msg_receive_trap -21 5 40msg_rpc_trap -22 6 41lw_wire -30 3 42lw_unwire -31 1 43nxm_task_init -33 2 44nxm_sched_thread -34 1 45nxm_idle -35 1 46nxm_wakeup_idle -36 1 47nxm_set_pthid -37 2 48nxm_thread_kill -38 2 49nxm_thread_block -39 1 50nxm_thread_wakeup -40 1 51inode_swap_preference -40 3 old call? 52init_process -41 0 53map_fd -43 5 54nxm_resched -44 2 55htg_unix_syscall -52 3 56host_self -55 1 57host_priv_self -56 1 58swtch_pri -59 1 59swtch -60 0 60thread_switch -61 3 61semop_fast -62 4 62mach_sctimes_0 -70 0 only if MACH_SCTIMES defined 63mach_sctimes_1 -71 1 only if MACH_SCTIMES defined 64mach_sctimes_2 -72 2 only if MACH_SCTIMES defined 65mach_sctimes_3 -73 3 only if MACH_SCTIMES defined 66mach_sctimes_4 -74 4 only if MACH_SCTIMES defined 67mach_sctimes_5 -75 5 only if MACH_SCTIMES defined 68mach_sctimes_6 -76 6 only if MACH_SCTIMES defined 69mach_sctimes_7 -77 0 only if MACH_SCTIMES defined 70mach_sctimes_8 -78 6 only if MACH_SCTIMES defined 71mach_sctimes_9 -79 1 only if MACH_SCTIMES defined 72mach_sctimes_10 -80 2 only if MACH_SCTIMES defined 73mach_sctimes_11 -81 2 only if MACH_SCTIMES defined 74mach_sctimes_port_alloc_dealloc -82 1 only if MACH_SCTIMES defined 75