/* * PowerPC version * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Derived from "arch/m68k/kernel/ptrace.c" * Copyright (C) 1994 by Hamish Macdonald * Taken from linux/kernel/ptrace.c and modified for M680x0. * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds * * Modified by Cort Dougan (cort@hq.fsmlabs.com) * and Paul Mackerras (paulus@samba.org). * * This file is subject to the terms and conditions of the GNU General * Public License. See the file README.legal in the main directory of * this archive for more details. */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/smp_lock.h> #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/user.h> #include <linux/security.h> #include <linux/signal.h> #include <linux/seccomp.h> #include <linux/audit.h> #ifdef CONFIG_PPC32 #include <linux/module.h> #endif #include <asm/uaccess.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/system.h> #ifdef CONFIG_PPC64 #include "ptrace-common.h" #endif #ifdef CONFIG_PPC32 /* * Set of msr bits that gdb can change on behalf of a process. */ #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) #define MSR_DEBUGCHANGE 0 #else #define MSR_DEBUGCHANGE (MSR_SE | MSR_BE) #endif #endif /* CONFIG_PPC32 */ /* * does not yet catch signals sent when the child dies. * in exit.c or in signal.c. */ #ifdef CONFIG_PPC32 /* * Get contents of register REGNO in task TASK. */ static inline unsigned long get_reg(struct task_struct *task, int regno) { if (regno < sizeof(struct pt_regs) / sizeof(unsigned long) && task->thread.regs != NULL) return ((unsigned long *)task->thread.regs)[regno]; return (0); } /* * Write contents of register REGNO in task TASK. */ static inline int put_reg(struct task_struct *task, int regno, unsigned long data) { if (regno <= PT_MQ && task->thread.regs != NULL) { if (regno == PT_MSR) data = (data & MSR_DEBUGCHANGE) | (task->thread.regs->msr & ~MSR_DEBUGCHANGE); ((unsigned long *)task->thread.regs)[regno] = data; return 0; } return -EIO; } #ifdef CONFIG_ALTIVEC /* * Get contents of AltiVec register state in task TASK */ static inline int get_vrregs(unsigned long __user *data, struct task_struct *task) { int i, j; if (!access_ok(VERIFY_WRITE, data, 133 * sizeof(unsigned long))) return -EFAULT; /* copy AltiVec registers VR[0] .. VR[31] */ for (i = 0; i < 32; i++) for (j = 0; j < 4; j++, data++) if (__put_user(task->thread.vr[i].u[j], data)) return -EFAULT; /* copy VSCR */ for (i = 0; i < 4; i++, data++) if (__put_user(task->thread.vscr.u[i], data)) return -EFAULT; /* copy VRSAVE */ if (__put_user(task->thread.vrsave, data)) return -EFAULT; return 0; } /* * Write contents of AltiVec register state into task TASK. */ static inline int set_vrregs(struct task_struct *task, unsigned long __user *data) { int i, j; if (!access_ok(VERIFY_READ, data, 133 * sizeof(unsigned long))) return -EFAULT; /* copy AltiVec registers VR[0] .. VR[31] */ for (i = 0; i < 32; i++) for (j = 0; j < 4; j++, data++) if (__get_user(task->thread.vr[i].u[j], data)) return -EFAULT; /* copy VSCR */ for (i = 0; i < 4; i++, data++) if (__get_user(task->thread.vscr.u[i], data)) return -EFAULT; /* copy VRSAVE */ if (__get_user(task->thread.vrsave, data)) return -EFAULT; return 0; } #endif #ifdef CONFIG_SPE /* * For get_evrregs/set_evrregs functions 'data' has the following layout: * * struct { * u32 evr[32]; * u64 acc; * u32 spefscr; * } */ /* * Get contents of SPE register state in task TASK. */ static inline int get_evrregs(unsigned long *data, struct task_struct *task) { int i; if (!access_ok(VERIFY_WRITE, data, 35 * sizeof(unsigned long))) return -EFAULT; /* copy SPEFSCR */ if (__put_user(task->thread.spefscr, &data[34])) return -EFAULT; /* copy SPE registers EVR[0] .. EVR[31] */ for (i = 0; i < 32; i++, data++) if (__put_user(task->thread.evr[i], data)) return -EFAULT; /* copy ACC */ if (__put_user64(task->thread.acc, (unsigned long long *)data)) return -EFAULT; return 0; } /* * Write contents of SPE register state into task TASK. */ static inline int set_evrregs(struct task_struct *task, unsigned long *data) { int i; if (!access_ok(VERIFY_READ, data, 35 * sizeof(unsigned long))) return -EFAULT; /* copy SPEFSCR */ if (__get_user(task->thread.spefscr, &data[34])) return -EFAULT; /* copy SPE registers EVR[0] .. EVR[31] */ for (i = 0; i < 32; i++, data++) if (__get_user(task->thread.evr[i], data)) return -EFAULT; /* copy ACC */ if (__get_user64(task->thread.acc, (unsigned long long*)data)) return -EFAULT; return 0; } #endif /* CONFIG_SPE */ static inline void set_single_step(struct task_struct *task) { struct pt_regs *regs = task->thread.regs; if (regs != NULL) { #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) task->thread.dbcr0 = DBCR0_IDM | DBCR0_IC; regs->msr |= MSR_DE; #else regs->msr |= MSR_SE; #endif } } static inline void clear_single_step(struct task_struct *task) { struct pt_regs *regs = task->thread.regs; if (regs != NULL) { #if defined(CONFIG_40x) || defined(CONFIG_BOOKE) task->thread.dbcr0 = 0; regs->msr &= ~MSR_DE; #else regs->msr &= ~MSR_SE; #endif } } #endif /* CONFIG_PPC32 */ /* * Called by kernel/ptrace.c when detaching.. * * Make sure single step bits etc are not set. */ void ptrace_disable(struct task_struct *child) { /* make sure the single step bit is not set. */ clear_single_step(child); } long arch_ptrace(struct task_struct *child, long request, long addr, long data) { int ret = -EPERM; switch (request) { /* when I and D space are separate, these will need to be fixed. */ case PTRACE_PEEKTEXT: /* read word at location addr. */ case PTRACE_PEEKDATA: { unsigned long tmp; int copied; copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); ret = -EIO; if (copied != sizeof(tmp)) break; ret = put_user(tmp,(unsigned long __user *) data); break; } /* read the word at location addr in the USER area. */ case PTRACE_PEEKUSR: { unsigned long index, tmp; ret = -EIO; /* convert to index and check */ #ifdef CONFIG_PPC32 index = (unsigned long) addr >> 2; if ((addr & 3) || (index > PT_FPSCR) || (child->thread.regs == NULL)) #else index = (unsigned long) addr >> 3; if ((addr & 7) || (index > PT_FPSCR)) #endif break; #ifdef CONFIG_PPC32 CHECK_FULL_REGS(child->thread.regs); #endif if (index < PT_FPR0) { tmp = get_reg(child, (int) index); } else { flush_fp_to_thread(child); tmp = ((unsigned long *)child->thread.fpr)[index - PT_FPR0]; } ret = put_user(tmp,(unsigned long __user *) data); break; } /* If I and D space are separate, this will have to be fixed. */ case PTRACE_POKETEXT: /* write the word at location addr. */ case PTRACE_POKEDATA: ret = 0; if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data)) break; ret = -EIO; break; /* write the word at location addr in the USER area */ case PTRACE_POKEUSR: { unsigned long index; ret = -EIO; /* convert to index and check */ #ifdef CONFIG_PPC32 index = (unsigned long) addr >> 2; if ((addr & 3) || (index > PT_FPSCR) || (child->thread.regs == NULL)) #else index = (unsigned long) addr >> 3; if ((addr & 7) || (index > PT_FPSCR)) #endif break; #ifdef CONFIG_PPC32 CHECK_FULL_REGS(child->thread.regs); #endif if (index == PT_ORIG_R3) break; if (index < PT_FPR0) { ret = put_reg(child, index, data); } else { flush_fp_to_thread(child); ((unsigned long *)child->thread.fpr)[index - PT_FPR0] = data; ret = 0; } break; } case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ case PTRACE_CONT: { /* restart after signal. */ ret = -EIO; if (!valid_signal(data)) break; if (request == PTRACE_SYSCALL) set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); else clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); child->exit_code = data; /* make sure the single step bit is not set. */ clear_single_step(child); wake_up_process(child); ret = 0; break; } /* * make the child exit. Best I can do is send it a sigkill. * perhaps it should be put in the status that it wants to * exit. */ case PTRACE_KILL: { ret = 0; if (child->exit_state == EXIT_ZOMBIE) /* already dead */ break; child->exit_code = SIGKILL; /* make sure the single step bit is not set. */ clear_single_step(child); wake_up_process(child); break; } case PTRACE_SINGLESTEP: { /* set the trap flag. */ ret = -EIO; if (!valid_signal(data)) break; clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); set_single_step(child); child->exit_code = data; /* give it a chance to run. */ wake_up_process(child); ret = 0; break; } #ifdef CONFIG_PPC64 case PTRACE_GET_DEBUGREG: { ret = -EINVAL; /* We only support one DABR and no IABRS at the moment */ if (addr > 0) break; ret = put_user(child->thread.dabr, (unsigned long __user *)data); break; } case PTRACE_SET_DEBUGREG: ret = ptrace_set_debugreg(child, addr, data); break; #endif case PTRACE_DETACH: ret = ptrace_detach(child, data); break; case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */ int i; unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; unsigned long __user *tmp = (unsigned long __user *)addr; for (i = 0; i < 32; i++) { ret = put_user(*reg, tmp); if (ret) break; reg++; tmp++; } break; } case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */ int i; unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; unsigned long __user *tmp = (unsigned long __user *)addr; for (i = 0; i < 32; i++) { ret = get_user(*reg, tmp); if (ret) break; reg++; tmp++; } break; } case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */ int i; unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; unsigned long __user *tmp = (unsigned long __user *)addr; flush_fp_to_thread(child); for (i = 0; i < 32; i++) { ret = put_user(*reg, tmp); if (ret) break; reg++; tmp++; } break; } case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */ int i; unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; unsigned long __user *tmp = (unsigned long __user *)addr; flush_fp_to_thread(child); for (i = 0; i < 32; i++) { ret = get_user(*reg, tmp); if (ret) break; reg++; tmp++; } break; } #ifdef CONFIG_ALTIVEC case PTRACE_GETVRREGS: /* Get the child altivec register state. */ flush_altivec_to_thread(child); ret = get_vrregs((unsigned long __user *)data, child); break; case PTRACE_SETVRREGS: /* Set the child altivec register state. */ flush_altivec_to_thread(child); ret = set_vrregs(child, (unsigned long __user *)data); break; #endif #ifdef CONFIG_SPE case PTRACE_GETEVRREGS: /* Get the child spe register state. */ if (child->thread.regs->msr & MSR_SPE) giveup_spe(child); ret = get_evrregs((unsigned long __user *)data, child); break; case PTRACE_SETEVRREGS: /* Set the child spe register state. */ /* this is to clear the MSR_SPE bit to force a reload * of register state from memory */ if (child->thread.regs->msr & MSR_SPE) giveup_spe(child); ret = set_evrregs(child, (unsigned long __user *)data); break; #endif default: ret = ptrace_request(child, request, addr, data); break; } return ret; } static void do_syscall_trace(void) { /* the 0x80 provides a way for the tracing parent to distinguish between a syscall stop and SIGTRAP delivery */ ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0)); /* * this isn't the same as continuing with a signal, but it will do * for normal use. strace only continues with a signal if the * stopping signal is not SIGTRAP. -brl */ if (current->exit_code) { send_sig(current->exit_code, current, 1); current->exit_code = 0; } } void do_syscall_trace_enter(struct pt_regs *regs) { #ifdef CONFIG_PPC64 secure_computing(regs->gpr[0]); #endif if (test_thread_flag(TIF_SYSCALL_TRACE) && (current->ptrace & PT_PTRACED)) do_syscall_trace(); if (unlikely(current->audit_context)) audit_syscall_entry( #ifdef CONFIG_PPC32 AUDIT_ARCH_PPC, #else test_thread_flag(TIF_32BIT)?AUDIT_ARCH_PPC:AUDIT_ARCH_PPC64, #endif regs->gpr[0], regs->gpr[3], regs->gpr[4], regs->gpr[5], regs->gpr[6]); } void do_syscall_trace_leave(struct pt_regs *regs) { #ifdef CONFIG_PPC32 secure_computing(regs->gpr[0]); #endif if (unlikely(current->audit_context)) audit_syscall_exit((regs->ccr&0x1000)?AUDITSC_FAILURE:AUDITSC_SUCCESS, regs->result); if ((test_thread_flag(TIF_SYSCALL_TRACE) || test_thread_flag(TIF_SINGLESTEP)) && (current->ptrace & PT_PTRACED)) do_syscall_trace(); } #ifdef CONFIG_PPC32 EXPORT_SYMBOL(do_syscall_trace_enter); EXPORT_SYMBOL(do_syscall_trace_leave); #endif