/* $NetBSD: linux_ptrace.c,v 1.21.8.1 2022/08/03 11:11:33 martin Exp $ */ /*- * Copyright (c) 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matthias Scheler. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: linux_ptrace.c,v 1.21.8.1 2022/08/03 11:11:33 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* for emul_linux */ #include #include /* for offsetof() */ /* * On ARMv2, uregs contains R0--R15, orig_R0. * On ARMv3 and later, it's R0--R15, CPSR, orig_R0. * As far as I can see, Linux doesn't initialise orig_R0 on ARMv2, so we * just produce the ARMv3 version. */ struct linux_reg { long uregs[18]; }; #define LINUX_REG_R0 0 #define LINUX_REG_R1 1 #define LINUX_REG_R2 2 #define LINUX_REG_R3 3 #define LINUX_REG_R4 4 #define LINUX_REG_R5 5 #define LINUX_REG_R6 6 #define LINUX_REG_R7 7 #define LINUX_REG_R8 8 #define LINUX_REG_R9 9 #define LINUX_REG_R10 10 #define LINUX_REG_FP 11 #define LINUX_REG_IP 12 #define LINUX_REG_SP 13 #define LINUX_REG_LR 14 #define LINUX_REG_PC 15 #define LINUX_REG_CPSR 16 #define LINUX_REG_ORIG_R0 17 int linux_ptrace_disabled = 1; /* bitrotted */ int linux_sys_ptrace_arch(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval) { /* { syscallarg(int) request; syscallarg(int) pid; syscallarg(int) addr; syscallarg(int) data; } */ struct proc *p = l->l_proc, *t; struct lwp *lt; #ifdef _ARM_ARCH_6 struct pcb *pcb; void *val; #endif struct reg *regs = NULL; struct linux_reg *linux_regs = NULL; int request, error; if (linux_ptrace_disabled) return ENOSYS; error = 0; request = SCARG(uap, request); regs = kmem_alloc(sizeof(struct reg), KM_SLEEP); linux_regs = kmem_alloc(sizeof(struct linux_reg), KM_SLEEP); switch (request) { case LINUX_PTRACE_GETREGS: break; case LINUX_PTRACE_SETREGS: error = copyin((void *)SCARG(uap, data), linux_regs, sizeof(struct linux_reg)); if (error) { goto out; } break; default: error = EIO; goto out; } /* Find the process we are supposed to be operating on. */ mutex_enter(proc_lock); if ((t = proc_find(SCARG(uap, pid))) == NULL) { mutex_exit(proc_lock); error = ESRCH; goto out; } mutex_enter(t->p_lock); /* * You cannot do what you want to the process if: * 1. It is not being traced at all, */ if (!ISSET(t->p_slflag, PSL_TRACED)) { mutex_exit(t->p_lock); mutex_exit(proc_lock); error = EPERM; goto out; } /* * 2. It is being traced by procfs (which has different signal * delivery semantics), * 3. It is not being traced by _you_, or * 4. It is not currently stopped. */ if (t->p_pptr != p || t->p_stat != SSTOP || !t->p_waited) { mutex_exit(t->p_lock); mutex_exit(proc_lock); error = EBUSY; goto out; } mutex_exit(proc_lock); /* XXX: ptrace needs revamp for multi-threading support. */ if (t->p_nlwps > 1) { mutex_exit(t->p_lock); error = ENOSYS; goto out; } lt = LIST_FIRST(&t->p_lwps); *retval = 0; switch (request) { case LINUX_PTRACE_GETREGS: error = process_read_regs(lt, regs); mutex_exit(t->p_lock); if (error) { break; } memset(linux_regs, 0, sizeof(*linux_regs)); memcpy(linux_regs->uregs, regs->r, 13 * sizeof(register_t)); linux_regs->uregs[LINUX_REG_SP] = regs->r_sp; linux_regs->uregs[LINUX_REG_LR] = regs->r_lr; linux_regs->uregs[LINUX_REG_PC] = regs->r_pc; linux_regs->uregs[LINUX_REG_CPSR] = regs->r_cpsr; linux_regs->uregs[LINUX_REG_ORIG_R0] = regs->r[0]; error = copyout(linux_regs, (void *)SCARG(uap, data), sizeof(struct linux_reg)); break; case LINUX_PTRACE_SETREGS: memcpy(regs->r, linux_regs->uregs, 13 * sizeof(register_t)); regs->r_sp = linux_regs->uregs[LINUX_REG_SP]; regs->r_lr = linux_regs->uregs[LINUX_REG_LR]; regs->r_pc = linux_regs->uregs[LINUX_REG_PC]; regs->r_cpsr = linux_regs->uregs[LINUX_REG_CPSR]; error = process_write_regs(lt, regs); mutex_exit(t->p_lock); break; #ifdef _ARM_ARCH_6 #define LINUX_PTRACE_GET_THREAD_AREA 22 case LINUX_PTRACE_GET_THREAD_AREA: mutex_exit(t->p_lock); pcb = lwp_getpcb(l); val = (void *)pcb->pcb_user_pid_ro; error = copyout(&val, (void *)SCARG(uap, data), sizeof(val)); break; #endif default: mutex_exit(t->p_lock); } out: if (regs) kmem_free(regs, sizeof(*regs)); if (linux_regs) kmem_free(linux_regs, sizeof(*linux_regs)); return error; }