/* $NetBSD: linux_ptrace.c,v 1.21 2008/12/17 20:51:33 cegger Exp $ */ /*- * Copyright (c) 1999, 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matthias Scheler and Emmanuel Dreyfus. * * 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 2008/12/17 20:51:33 cegger Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* for emul_linux */ #include #include /* for offsetof() */ /* * From Linux's include/asm-ppc/ptrace.h. * structure used for storing reg context: defined in linux_machdep.h * structure used for storing floating point context: * Linux just uses a double fpr[32], no struct */ /* * user struct for linux process - this is used for Linux ptrace emulation * most of it is junk only used by gdb * * From Linux's include/asm-ppc/user.h * * XXX u_ar0 was a struct reg in Linux/powerpc * Can't find out what a struct regs is for Linux/powerpc, * so we use a struct pt_regs instead. don't know if this is right. */ struct linux_user { struct linux_pt_regs regs; #define lusr_startgdb regs size_t u_tsize; size_t u_dsize; size_t u_ssize; unsigned long start_code; unsigned long start_data; unsigned long start_stack; long int signal; struct linux_pt_regs *u_ar0; /* help gdb find registers */ unsigned long magic; char u_comm[32]; #define lu_comm_end u_comm[31] }; #define LUSR_OFF(member) offsetof(struct linux_user, member) #define LUSR_REG_OFF(member) offsetof(struct linux_pt_regs, member) #define ISSET(t, f) ((t) & (f)) int linux_ptrace_disabled = 1; /* bitrotted */ /* XXX Check me! (From NetBSD/i386) */ 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; } */ int request, error; struct proc *p = l->l_proc; struct proc *t; /* target process */ struct lwp *lt; struct reg *regs = NULL; struct fpreg *fpregs = NULL; struct linux_pt_regs *linux_regs = NULL; double *linux_fpreg = NULL; /* it's an array, not a struct */ int addr; int i; if (linux_ptrace_disabled) return ENOSYS; switch (request = SCARG(uap, request)) { case LINUX_PTRACE_PEEKUSR: case LINUX_PTRACE_POKEUSR: case LINUX_PTRACE_GETREGS: case LINUX_PTRACE_SETREGS: case LINUX_PTRACE_GETFPREGS: case LINUX_PTRACE_SETFPREGS: break; default: return EIO; } /* Find the process we're supposed to be operating on. */ if ((t = pfind(SCARG(uap, pid))) == NULL) return ESRCH; /* * You can't do what you want to the process if: * (1) It's not being traced at all, */ if (!ISSET(t->p_slflag, PSL_TRACED)) /* XXXSMP */ return EPERM; /* * (2) it's being traced by procfs (which has * different signal delivery semantics), */ if (ISSET(t->p_slflag, PSL_FSTRACE)) return EBUSY; /* * (3) it's not being traced by _you_, or */ if (t->p_pptr != p) return EBUSY; /* * (4) it's not currently stopped. */ if (t->p_stat != SSTOP || !t->p_waited) return EBUSY; lt = LIST_FIRST(&t->p_lwps); *retval = 0; switch (request) { case LINUX_PTRACE_GETREGS: regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK); linux_regs = malloc(sizeof(*linux_regs), M_TEMP, M_WAITOK); error = process_read_regs(lt, regs); if (error != 0) goto out; for (i=0; i<=31; i++) linux_regs->lgpr[i] = regs->fixreg[i]; linux_regs->lnip = regs->pc; linux_regs->lmsr = 0; /* XXX Is that right? */ linux_regs->lorig_gpr3 = regs->fixreg[3]; linux_regs->lctr = regs->ctr; linux_regs->llink = regs->lr; linux_regs->lxer = regs->xer; linux_regs->lccr = regs->cr; linux_regs->lmq = 0; linux_regs->ltrap = 0; linux_regs->ldar = 0; linux_regs->ldsisr = 0; linux_regs->lresult = 0; error = copyout(linux_regs, (void *)SCARG(uap, data), sizeof(struct linux_pt_regs)); goto out; case LINUX_PTRACE_SETREGS: regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK); linux_regs = malloc(sizeof(*linux_regs), M_TEMP, M_WAITOK); error = copyin((void *)SCARG(uap, data), linux_regs, sizeof(struct linux_pt_regs)); if (error != 0) goto out; for (i=0; i<=31; i++) regs->fixreg[i] = linux_regs->lgpr[i]; regs->lr = linux_regs->llink; regs->cr = linux_regs->lccr; regs->xer = linux_regs->lxer; regs->ctr = linux_regs->lctr; regs->pc = linux_regs->lnip; /* XXX */ error = process_write_regs(lt, regs); goto out; case LINUX_PTRACE_GETFPREGS: fpregs = malloc(sizeof(struct fpreg), M_TEMP, M_WAITOK); linux_fpreg = malloc(32*sizeof(double), M_TEMP, M_WAITOK); error = process_read_fpregs(lt, fpregs); if (error != 0) goto out; /* zero the contents if NetBSD fpreg structure is smaller */ if (sizeof(struct fpreg) < (32*sizeof(double))) memset(linux_fpreg, '\0', (32*sizeof(double))); memcpy(linux_fpreg, fpregs, min(32*sizeof(double), sizeof(struct fpreg))); error = copyout(linux_fpreg, (void *)SCARG(uap, data), 32*sizeof(double)); goto out; case LINUX_PTRACE_SETFPREGS: fpregs = malloc(sizeof(struct fpreg), M_TEMP, M_WAITOK); linux_fpreg = malloc(32*sizeof(double), M_TEMP, M_WAITOK); error = copyin((void *)SCARG(uap, data), linux_fpreg, 32*sizeof(double)); if (error != 0) goto out; memset(fpregs, '\0', sizeof(struct fpreg)); memcpy(fpregs, linux_fpreg, min(32*sizeof(double), sizeof(struct fpreg))); error = process_write_fpregs(lt, fpregs); goto out; case LINUX_PTRACE_PEEKUSR: addr = SCARG(uap, addr); regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK); error = process_read_regs(lt, regs); if (error) goto out; uvm_lwp_hold(lt); /* need full process info */ error = 0; if ((addr < LUSR_OFF(lusr_startgdb)) || (addr > LUSR_OFF(lu_comm_end))) error = 1; else if (addr == LUSR_OFF(u_tsize)) *retval = p->p_vmspace->vm_tsize; else if (addr == LUSR_OFF(u_dsize)) *retval = p->p_vmspace->vm_dsize; else if (addr == LUSR_OFF(u_ssize)) *retval = p->p_vmspace->vm_ssize; else if (addr == LUSR_OFF(start_code)) *retval = (register_t) p->p_vmspace->vm_taddr; else if (addr == LUSR_OFF(start_stack)) *retval = (register_t) p->p_vmspace->vm_minsaddr; else if ((addr >= LUSR_REG_OFF(lpt_regs_fixreg_begin)) && (addr <= LUSR_REG_OFF(lpt_regs_fixreg_end))) *retval = regs->fixreg[addr / sizeof (register_t)]; else if (addr == LUSR_REG_OFF(lnip)) *retval = regs->pc; else if (addr == LUSR_REG_OFF(lctr)) *retval = regs->ctr; else if (addr == LUSR_REG_OFF(llink)) *retval = regs->lr; else if (addr == LUSR_REG_OFF(lxer)) *retval = regs->xer; else if (addr == LUSR_REG_OFF(lccr)) *retval = regs->cr; else if (addr == LUSR_OFF(signal)) error = 1; else if (addr == LUSR_OFF(signal)) error = 1; else if (addr == LUSR_OFF(magic)) error = 1; else if (addr == LUSR_OFF(u_comm)) error = 1; else { #ifdef DEBUG_LINUX printf("linux_ptrace: unsupported address: %d\n", addr); #endif error = 1; } uvm_lwp_rele(lt); if (error) goto out; error = copyout (retval, (void *)SCARG(uap, data), sizeof retval); *retval = SCARG(uap, data); goto out; break; case LINUX_PTRACE_POKEUSR: /* XXX Not tested */ addr = SCARG(uap, addr); regs = malloc(sizeof(struct reg), M_TEMP, M_WAITOK); error = process_read_regs(lt, regs); if (error) goto out; uvm_lwp_hold(lt); /* need full process info */ error = 0; if ((addr < LUSR_OFF(lusr_startgdb)) || (addr > LUSR_OFF(lu_comm_end))) error = 1; else if (addr == LUSR_OFF(u_tsize)) error = 1; else if (addr == LUSR_OFF(u_dsize)) error = 1; else if (addr == LUSR_OFF(u_ssize)) error = 1; else if (addr == LUSR_OFF(start_code)) error = 1; else if (addr == LUSR_OFF(start_stack)) error = 1; else if ((addr >= LUSR_REG_OFF(lpt_regs_fixreg_begin)) && (addr <= LUSR_REG_OFF(lpt_regs_fixreg_end))) regs->fixreg[addr / sizeof (register_t)] = (register_t)SCARG(uap, data); else if (addr == LUSR_REG_OFF(lnip)) regs->pc = (register_t)SCARG(uap, data); else if (addr == LUSR_REG_OFF(lctr)) regs->ctr = (register_t)SCARG(uap, data); else if (addr == LUSR_REG_OFF(llink)) regs->lr = (register_t)SCARG(uap, data); else if (addr == LUSR_REG_OFF(lxer)) regs->xer = (register_t)SCARG(uap, data); else if (addr == LUSR_REG_OFF(lccr)) regs->cr = (register_t)SCARG(uap, data); else if (addr == LUSR_OFF(signal)) error = 1; else if (addr == LUSR_OFF(magic)) error = 1; else if (addr == LUSR_OFF(u_comm)) error = 1; else { #ifdef DEBUG_LINUX printf("linux_ptrace: unsupported address: %d\n", addr); #endif error = 1; } uvm_lwp_rele(lt); error = process_write_regs(lt,regs); if (error) goto out; break; default: /* never reached */ break; } return EIO; out: if (regs) free(regs, M_TEMP); if (fpregs) free(fpregs, M_TEMP); if (linux_regs) free(linux_regs, M_TEMP); if (linux_fpreg) free(linux_fpreg, M_TEMP); return (error); }