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/param.h> 29 #include <sys/systm.h> 30 #include <sys/elf.h> 31 #include <sys/exec.h> 32 #include <sys/imgact.h> 33 #include <sys/kernel.h> 34 #include <sys/limits.h> 35 #include <sys/lock.h> 36 #include <sys/mutex.h> 37 #include <sys/proc.h> 38 #include <sys/ptrace.h> 39 #include <sys/reg.h> 40 #include <sys/rwlock.h> 41 #include <sys/signalvar.h> 42 #include <sys/syscallsubr.h> 43 #include <sys/sysent.h> 44 #include <sys/sysproto.h> 45 #include <sys/ucontext.h> 46 47 #include <machine/armreg.h> 48 #include <machine/pcb.h> 49 50 /* Only used to get/set 32bits VFP regs */ 51 int 52 cpu_ptrace(struct thread *td, int req, void *arg, int data) 53 { 54 #if defined(VFP) && defined(COMPAT_FREEBSD32) 55 mcontext32_vfp_t vfp; 56 int error; 57 58 if (!SV_CURPROC_FLAG(SV_ILP32)) 59 return (EINVAL); 60 switch (req) { 61 case PT_GETVFPREGS32: 62 get_fpcontext32(td, &vfp); 63 error = copyout(&vfp, arg, sizeof(vfp)); 64 break; 65 case PT_SETVFPREGS32: 66 error = copyin(arg, &vfp, sizeof(vfp)); 67 if (error == 0) 68 set_fpcontext32(td, &vfp); 69 break; 70 default: 71 error = EINVAL; 72 } 73 74 return (error); 75 #else 76 return (EINVAL); 77 #endif 78 } 79 80 #if defined(VFP) && defined(COMPAT_FREEBSD32) 81 static bool 82 get_arm_vfp(struct regset *rs, struct thread *td, void *buf, size_t *sizep) 83 { 84 if (buf != NULL) { 85 KASSERT(*sizep == sizeof(mcontext32_vfp_t), 86 ("%s: invalid size", __func__)); 87 get_fpcontext32(td, buf); 88 } 89 *sizep = sizeof(mcontext32_vfp_t); 90 return (true); 91 } 92 93 static bool 94 set_arm_vfp(struct regset *rs, struct thread *td, void *buf, 95 size_t size) 96 { 97 KASSERT(size == sizeof(mcontext32_vfp_t), ("%s: invalid size", 98 __func__)); 99 set_fpcontext32(td, buf); 100 return (true); 101 } 102 103 static struct regset regset_arm_vfp = { 104 .note = NT_ARM_VFP, 105 .size = sizeof(mcontext32_vfp_t), 106 .get = get_arm_vfp, 107 .set = set_arm_vfp, 108 }; 109 ELF32_REGSET(regset_arm_vfp); 110 #endif 111 112 static bool 113 get_arm64_tls(struct regset *rs, struct thread *td, void *buf, 114 size_t *sizep) 115 { 116 if (buf != NULL) { 117 KASSERT(*sizep == sizeof(td->td_pcb->pcb_tpidr_el0), 118 ("%s: invalid size", __func__)); 119 memcpy(buf, &td->td_pcb->pcb_tpidr_el0, 120 sizeof(td->td_pcb->pcb_tpidr_el0)); 121 } 122 *sizep = sizeof(td->td_pcb->pcb_tpidr_el0); 123 124 return (true); 125 } 126 127 static struct regset regset_arm64_tls = { 128 .note = NT_ARM_TLS, 129 .size = sizeof(uint64_t), 130 .get = get_arm64_tls, 131 }; 132 ELF_REGSET(regset_arm64_tls); 133 134 #ifdef COMPAT_FREEBSD32 135 static bool 136 get_arm_tls(struct regset *rs, struct thread *td, void *buf, 137 size_t *sizep) 138 { 139 if (buf != NULL) { 140 uint32_t tp; 141 142 KASSERT(*sizep == sizeof(uint32_t), 143 ("%s: invalid size", __func__)); 144 tp = (uint32_t)td->td_pcb->pcb_tpidr_el0; 145 memcpy(buf, &tp, sizeof(tp)); 146 } 147 *sizep = sizeof(uint32_t); 148 149 return (true); 150 } 151 152 static struct regset regset_arm_tls = { 153 .note = NT_ARM_TLS, 154 .size = sizeof(uint32_t), 155 .get = get_arm_tls, 156 }; 157 ELF32_REGSET(regset_arm_tls); 158 #endif 159 160 int 161 ptrace_set_pc(struct thread *td, u_long addr) 162 { 163 164 td->td_frame->tf_elr = addr; 165 return (0); 166 } 167 168 int 169 ptrace_single_step(struct thread *td) 170 { 171 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 172 if ((td->td_frame->tf_spsr & PSR_SS) == 0) { 173 td->td_frame->tf_spsr |= PSR_SS; 174 td->td_pcb->pcb_flags |= PCB_SINGLE_STEP; 175 td->td_dbgflags |= TDB_STEP; 176 } 177 return (0); 178 } 179 180 int 181 ptrace_clear_single_step(struct thread *td) 182 { 183 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 184 td->td_frame->tf_spsr &= ~PSR_SS; 185 td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP; 186 td->td_dbgflags &= ~TDB_STEP; 187 return (0); 188 } 189 190