| 1 | /* $NetBSD: linux_trap.c,v 1.11 2012/02/19 21:06:35 rmind Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2001 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Christos Zoulas. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * x86 Trap and System call handling |
| 34 | */ |
| 35 | |
| 36 | #include <sys/cdefs.h> |
| 37 | __KERNEL_RCSID(0, "$NetBSD: linux_trap.c,v 1.11 2012/02/19 21:06:35 rmind Exp $" ); |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/systm.h> |
| 41 | #include <sys/proc.h> |
| 42 | #include <sys/acct.h> |
| 43 | #include <sys/kernel.h> |
| 44 | #include <sys/signal.h> |
| 45 | #include <sys/signalvar.h> |
| 46 | #include <sys/syscall.h> |
| 47 | |
| 48 | #include <uvm/uvm_extern.h> |
| 49 | |
| 50 | #include <machine/cpu.h> |
| 51 | #include <machine/cpufunc.h> |
| 52 | #include <machine/psl.h> |
| 53 | #include <machine/reg.h> |
| 54 | #include <machine/trap.h> |
| 55 | #include <machine/userret.h> |
| 56 | |
| 57 | #include <compat/linux/common/linux_exec.h> |
| 58 | |
| 59 | #ifndef DEBUG_LINUX |
| 60 | #define DPRINTF(a) |
| 61 | #else |
| 62 | #define DPRINTF(a) uprintf a |
| 63 | #endif |
| 64 | |
| 65 | struct linux_user_desc { |
| 66 | unsigned int entry_number; |
| 67 | unsigned int base_addr; |
| 68 | unsigned int limit; |
| 69 | unsigned int seg_32bit:1; |
| 70 | unsigned int contents:2; |
| 71 | unsigned int read_exec_only:1; |
| 72 | unsigned int limit_in_pages:1; |
| 73 | unsigned int seg_not_present:1; |
| 74 | unsigned int useable:1; |
| 75 | }; |
| 76 | |
| 77 | #define LINUX_T_DIVIDE 0 |
| 78 | #define LINUX_T_DEBUG 1 |
| 79 | #define LINUX_T_NMI 2 |
| 80 | #define LINUX_T_INT3 3 |
| 81 | #define LINUX_T_OVERFLOW 4 |
| 82 | #define LINUX_T_BOUNDS 5 |
| 83 | #define LINUX_T_INVALID_OP 6 |
| 84 | #define LINUX_T_DEVICE_NOT_AVAIL 7 |
| 85 | #define LINUX_T_DOUBLE_FAULT 8 |
| 86 | #define LINUX_T_COPROC_SEG_OVERRUN 9 |
| 87 | #define LINUX_T_INVALID_TSS 10 |
| 88 | #define LINUX_T_SEG_NOT_PRESENT 11 |
| 89 | #define LINUX_T_STACK_SEG_FAULT 12 |
| 90 | #define LINUX_T_GENERAL_PROT_FAULT 13 |
| 91 | #define LINUX_T_PAGE_FAULT 14 |
| 92 | #define LINUX_T_SPURIOUS_INTERRUPT 15 |
| 93 | #define LINUX_T_COPROC_ERROR 16 |
| 94 | #define LINUX_T_ALIGN_CHECK 17 |
| 95 | #define LINUX_T_MACHINE_CHECK 18 /* XXX */ |
| 96 | #define LINUX_T_SIMD_COPROC_ERROR 19 /* XXX */ |
| 97 | |
| 98 | /* Note 255 is bogus */ |
| 99 | static const int trapno_to_x86_vec[] = { |
| 100 | LINUX_T_INVALID_OP, /* 0 T_PRIVINFLT */ |
| 101 | LINUX_T_INT3, /* 1 T_BPTFLT */ |
| 102 | LINUX_T_COPROC_ERROR, /* 2 T_ARITHTRAP */ |
| 103 | LINUX_T_SPURIOUS_INTERRUPT, /* 3 T_ASTFLT XXX: ??? */ |
| 104 | LINUX_T_GENERAL_PROT_FAULT, /* 4 T_PROTFLT */ |
| 105 | LINUX_T_DEBUG, /* 5 T_TRCTRAP */ |
| 106 | LINUX_T_PAGE_FAULT, /* 6 T_PAGEFLT */ |
| 107 | LINUX_T_ALIGN_CHECK, /* 7 T_ALIGNFLT */ |
| 108 | LINUX_T_DIVIDE, /* 8 T_DIVIDE */ |
| 109 | LINUX_T_NMI, /* 9 T_NMI */ |
| 110 | LINUX_T_OVERFLOW, /* 10 T_OFLOW */ |
| 111 | LINUX_T_BOUNDS, /* 11 T_BOUND */ |
| 112 | LINUX_T_DEVICE_NOT_AVAIL, /* 12 T_DNA */ |
| 113 | LINUX_T_DOUBLE_FAULT, /* 13 T_DOUBLEFLT */ |
| 114 | LINUX_T_COPROC_SEG_OVERRUN, /* 14 T_FPOPFLT */ |
| 115 | LINUX_T_INVALID_TSS, /* 15 T_TSSFLT */ |
| 116 | LINUX_T_SEG_NOT_PRESENT, /* 16 T_SEGNPFLT */ |
| 117 | LINUX_T_STACK_SEG_FAULT, /* 17 T_STKFLT */ |
| 118 | LINUX_T_MACHINE_CHECK /* 18 T_RESERVED XXX: ??? */ |
| 119 | }; |
| 120 | |
| 121 | /* For the nmi and reserved below linux does not post a signal. */ |
| 122 | static const int linux_x86_vec_to_sig[] = { |
| 123 | SIGFPE, /* 0 LINUX_T_DIVIDE */ |
| 124 | SIGTRAP, /* 1 LINUX_T_DEBUG */ |
| 125 | /*nmi*/ SIGSEGV, /* 2 LINUX_T_NMI */ |
| 126 | SIGTRAP, /* 3 LINUX_T_INT3 */ |
| 127 | SIGSEGV, /* 4 LINUX_T_OVERFLOW */ |
| 128 | SIGSEGV, /* 5 LINUX_T_BOUNDS */ |
| 129 | SIGILL, /* 6 LINUX_T_INVALIDOP */ |
| 130 | SIGSEGV, /* 7 LINUX_T_DEVICE_NOT_AVAIL */ |
| 131 | SIGSEGV, /* 8 LINUX_T_DOUBLE_FAULT */ |
| 132 | SIGFPE, /* 9 LINUX_T_COPROC_SEG_OVERRUN */ |
| 133 | SIGSEGV, /* 10 LINUX_T_INVALID_TSS */ |
| 134 | SIGBUS, /* 11 LINUX_T_SEG_NOT_PRESENT */ |
| 135 | SIGBUS, /* 12 LINUX_T_STACK_SEG_FAULT */ |
| 136 | SIGSEGV, /* 13 LINUX_T_GENERAL_PROT_FAULT */ |
| 137 | SIGSEGV, /* 14 LINUX_T_PAGE_FAULT */ |
| 138 | /*resv*/SIGSEGV, /* 15 LINUX_T_SPURIOUS_INTERRUPT */ |
| 139 | SIGFPE, /* 16 LINUX_T_COPROC_ERROR */ |
| 140 | SIGSEGV, /* 17 LINUX_T_ALIGN_CHECK */ |
| 141 | SIGSEGV /* 18 LINUX_T_MACHINE_CHECK */ |
| 142 | }; |
| 143 | |
| 144 | void |
| 145 | linux_trapsignal(struct lwp *l, ksiginfo_t *ksi) |
| 146 | { |
| 147 | ksiginfo_t nksi; |
| 148 | |
| 149 | switch (ksi->ksi_signo) { |
| 150 | case SIGILL: |
| 151 | case SIGTRAP: |
| 152 | case SIGIOT: |
| 153 | case SIGBUS: |
| 154 | case SIGFPE: |
| 155 | case SIGSEGV: |
| 156 | KASSERT(KSI_TRAP_P(ksi)); |
| 157 | if (ksi->ksi_trap < __arraycount(trapno_to_x86_vec)) { |
| 158 | nksi = *ksi; |
| 159 | nksi.ksi_trap = trapno_to_x86_vec[ksi->ksi_trap]; |
| 160 | if (nksi.ksi_trap < __arraycount(linux_x86_vec_to_sig)) { |
| 161 | nksi.ksi_signo |
| 162 | = linux_x86_vec_to_sig[nksi.ksi_trap]; |
| 163 | } else { |
| 164 | uprintf("Unhandled sig type %d\n" , |
| 165 | ksi->ksi_trap); |
| 166 | } |
| 167 | ksi = &nksi; |
| 168 | } else { |
| 169 | uprintf("Unhandled trap type %d\n" , ksi->ksi_trap); |
| 170 | } |
| 171 | /*FALLTHROUGH*/ |
| 172 | |
| 173 | default: |
| 174 | trapsignal(l, ksi); |
| 175 | return; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | int |
| 180 | linux_lwp_setprivate(struct lwp *l, void *ptr) |
| 181 | { |
| 182 | struct linux_user_desc info; |
| 183 | int error; |
| 184 | |
| 185 | #ifdef __x86_64__ |
| 186 | if ((l->l_proc->p_flag & PK_32) == 0) { |
| 187 | return lwp_setprivate(l, ptr); |
| 188 | } |
| 189 | #endif |
| 190 | error = copyin(ptr, &info, sizeof(info)); |
| 191 | if (error) |
| 192 | return error; |
| 193 | |
| 194 | DPRINTF(("linux_lwp_setprivate: %i, %x, %x, %i, %i, %i, %i, %i, %i\n" , |
| 195 | info.entry_number, info.base_addr, info.limit, info.seg_32bit, |
| 196 | info.contents, info.read_exec_only, info.limit_in_pages, |
| 197 | info.seg_not_present, info.useable)); |
| 198 | |
| 199 | if (info.entry_number != GUGS_SEL) { |
| 200 | info.entry_number = GUGS_SEL; |
| 201 | error = copyout(&info, ptr, sizeof(info)); |
| 202 | if (error) |
| 203 | return error; |
| 204 | } |
| 205 | return lwp_setprivate(l, (void *)(uintptr_t)info.base_addr); |
| 206 | } |
| 207 | |