1 /*- 2 * Copyright (c) 2014 Andrew Turner 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/elf.h> 34 #include <sys/exec.h> 35 #include <sys/imgact.h> 36 #include <sys/kernel.h> 37 #include <sys/limits.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 #include <sys/ptrace.h> 42 #include <sys/reg.h> 43 #include <sys/rwlock.h> 44 #include <sys/signalvar.h> 45 #include <sys/syscallsubr.h> 46 #include <sys/sysent.h> 47 #include <sys/sysproto.h> 48 #include <sys/ucontext.h> 49 50 #include <machine/armreg.h> 51 #include <machine/pcb.h> 52 53 /* Only used to get/set 32bits VFP regs */ 54 int 55 cpu_ptrace(struct thread *td, int req, void *arg, int data) 56 { 57 #if defined(VFP) && defined(COMPAT_FREEBSD32) 58 mcontext32_vfp_t vfp; 59 int error; 60 61 if (!SV_CURPROC_FLAG(SV_ILP32)) 62 return (EINVAL); 63 switch (req) { 64 case PT_GETVFPREGS32: 65 get_fpcontext32(td, &vfp); 66 error = copyout(&vfp, arg, sizeof(vfp)); 67 break; 68 case PT_SETVFPREGS32: 69 error = copyin(arg, &vfp, sizeof(vfp)); 70 if (error == 0) 71 set_fpcontext32(td, &vfp); 72 break; 73 default: 74 error = EINVAL; 75 } 76 77 return (error); 78 #else 79 return (EINVAL); 80 #endif 81 } 82 83 #if defined(VFP) && defined(COMPAT_FREEBSD32) 84 static bool 85 get_arm_vfp(struct regset *rs, struct thread *td, void *buf, size_t *sizep) 86 { 87 if (buf != NULL) { 88 KASSERT(*sizep == sizeof(mcontext32_vfp_t), 89 ("%s: invalid size", __func__)); 90 get_fpcontext32(td, buf); 91 } 92 *sizep = sizeof(mcontext32_vfp_t); 93 return (true); 94 } 95 96 static bool 97 set_arm_vfp(struct regset *rs, struct thread *td, void *buf, 98 size_t size) 99 { 100 KASSERT(size == sizeof(mcontext32_vfp_t), ("%s: invalid size", 101 __func__)); 102 set_fpcontext32(td, buf); 103 return (true); 104 } 105 106 static struct regset regset_arm_vfp = { 107 .note = NT_ARM_VFP, 108 .size = sizeof(mcontext32_vfp_t), 109 .get = get_arm_vfp, 110 .set = set_arm_vfp, 111 }; 112 ELF32_REGSET(regset_arm_vfp); 113 #endif 114 115 static bool 116 get_arm64_tls(struct regset *rs, struct thread *td, void *buf, 117 size_t *sizep) 118 { 119 if (buf != NULL) { 120 KASSERT(*sizep == sizeof(td->td_pcb->pcb_tpidr_el0), 121 ("%s: invalid size", __func__)); 122 memcpy(buf, &td->td_pcb->pcb_tpidr_el0, 123 sizeof(td->td_pcb->pcb_tpidr_el0)); 124 } 125 *sizep = sizeof(td->td_pcb->pcb_tpidr_el0); 126 127 return (true); 128 } 129 130 static struct regset regset_arm64_tls = { 131 .note = NT_ARM_TLS, 132 .size = sizeof(uint64_t), 133 .get = get_arm64_tls, 134 }; 135 ELF_REGSET(regset_arm64_tls); 136 137 #ifdef COMPAT_FREEBSD32 138 static bool 139 get_arm_tls(struct regset *rs, struct thread *td, void *buf, 140 size_t *sizep) 141 { 142 if (buf != NULL) { 143 uint32_t tp; 144 145 KASSERT(*sizep == sizeof(uint32_t), 146 ("%s: invalid size", __func__)); 147 tp = (uint32_t)td->td_pcb->pcb_tpidr_el0; 148 memcpy(buf, &tp, sizeof(tp)); 149 } 150 *sizep = sizeof(uint32_t); 151 152 return (true); 153 } 154 155 static struct regset regset_arm_tls = { 156 .note = NT_ARM_TLS, 157 .size = sizeof(uint32_t), 158 .get = get_arm_tls, 159 }; 160 ELF32_REGSET(regset_arm_tls); 161 #endif 162 163 int 164 ptrace_set_pc(struct thread *td, u_long addr) 165 { 166 167 td->td_frame->tf_elr = addr; 168 return (0); 169 } 170 171 int 172 ptrace_single_step(struct thread *td) 173 { 174 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 175 if ((td->td_frame->tf_spsr & PSR_SS) == 0) { 176 td->td_frame->tf_spsr |= PSR_SS; 177 td->td_pcb->pcb_flags |= PCB_SINGLE_STEP; 178 td->td_dbgflags |= TDB_STEP; 179 } 180 return (0); 181 } 182 183 int 184 ptrace_clear_single_step(struct thread *td) 185 { 186 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 187 td->td_frame->tf_spsr &= ~PSR_SS; 188 td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP; 189 td->td_dbgflags &= ~TDB_STEP; 190 return (0); 191 } 192 193