/* * ptrace for 32-bit processes running on a 64-bit kernel. * * 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 COPYING in the main directory of * this archive for more details. */ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/regset.h> #include <linux/user.h> #include <linux/security.h> #include <linux/signal.h> #include <linux/compat.h> #include <asm/uaccess.h> #include <asm/page.h> #include <asm/pgtable.h> #include <asm/system.h> /* * does not yet catch signals sent when the child dies. * in exit.c or in signal.c. */ /* * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls, * we mark them as obsolete now, they will be removed in a future version */ static long compat_ptrace_old(struct task_struct *child, long request, long addr, long data) { switch (request) { case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */ return copy_regset_to_user(child, task_user_regset_view(current), 0, 0, 32 * sizeof(compat_long_t), compat_ptr(data)); case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */ return copy_regset_from_user(child, task_user_regset_view(current), 0, 0, 32 * sizeof(compat_long_t), compat_ptr(data)); } return -EPERM; } /* Macros to workout the correct index for the FPR in the thread struct */ #define FPRNUMBER(i) (((i) - PT_FPR0) >> 1) #define FPRHALF(i) (((i) - PT_FPR0) & 1) #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i) #define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0)) long compat_arch_ptrace(struct task_struct *child, compat_long_t request, compat_ulong_t caddr, compat_ulong_t cdata) { unsigned long addr = caddr; unsigned long data = cdata; int ret; switch (request) { /* * Read 4 bytes of the other process' storage * data is a pointer specifying where the user wants the * 4 bytes copied into * addr is a pointer in the user's storage that contains an 8 byte * address in the other process of the 4 bytes that is to be read * (this is run in a 32-bit process looking at a 64-bit process) * when I and D space are separate, these will need to be fixed. */ case PPC_PTRACE_PEEKTEXT_3264: case PPC_PTRACE_PEEKDATA_3264: { u32 tmp; int copied; u32 __user * addrOthers; ret = -EIO; /* Get the addr in the other process that we want to read */ if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) break; copied = access_process_vm(child, (u64)addrOthers, &tmp, sizeof(tmp), 0); if (copied != sizeof(tmp)) break; ret = put_user(tmp, (u32 __user *)data); break; } /* Read a register (specified by ADDR) out of the "user area" */ case PTRACE_PEEKUSR: { int index; unsigned long tmp; ret = -EIO; /* convert to index and check */ index = (unsigned long) addr >> 2; if ((addr & 3) || (index > PT_FPSCR32)) break; CHECK_FULL_REGS(child->thread.regs); if (index < PT_FPR0) { tmp = ptrace_get_reg(child, index); } else { flush_fp_to_thread(child); /* * the user space code considers the floating point * to be an array of unsigned int (32 bits) - the * index passed in is based on this assumption. */ tmp = ((unsigned int *)child->thread.fpr) [FPRINDEX(index)]; } ret = put_user((unsigned int)tmp, (u32 __user *)data); break; } /* * Read 4 bytes out of the other process' pt_regs area * data is a pointer specifying where the user wants the * 4 bytes copied into * addr is the offset into the other process' pt_regs structure * that is to be read * (this is run in a 32-bit process looking at a 64-bit process) */ case PPC_PTRACE_PEEKUSR_3264: { u32 index; u32 reg32bits; u64 tmp; u32 numReg; u32 part; ret = -EIO; /* Determine which register the user wants */ index = (u64)addr >> 2; numReg = index / 2; /* Determine which part of the register the user wants */ if (index % 2) part = 1; /* want the 2nd half of the register (right-most). */ else part = 0; /* want the 1st half of the register (left-most). */ /* Validate the input - check to see if address is on the wrong boundary * or beyond the end of the user area */ if ((addr & 3) || numReg > PT_FPSCR) break; CHECK_FULL_REGS(child->thread.regs); if (numReg >= PT_FPR0) { flush_fp_to_thread(child); /* get 64 bit FPR */ tmp = ((u64 *)child->thread.fpr) [FPRINDEX_3264(numReg)]; } else { /* register within PT_REGS struct */ tmp = ptrace_get_reg(child, numReg); } reg32bits = ((u32*)&tmp)[part]; ret = put_user(reg32bits, (u32 __user *)data); break; } /* * Write 4 bytes into the other process' storage * data is the 4 bytes that the user wants written * addr is a pointer in the user's storage that contains an * 8 byte address in the other process where the 4 bytes * that is to be written * (this is run in a 32-bit process looking at a 64-bit process) * when I and D space are separate, these will need to be fixed. */ case PPC_PTRACE_POKETEXT_3264: case PPC_PTRACE_POKEDATA_3264: { u32 tmp = data; u32 __user * addrOthers; /* Get the addr in the other process that we want to write into */ ret = -EIO; if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) break; ret = 0; if (access_process_vm(child, (u64)addrOthers, &tmp, sizeof(tmp), 1) == sizeof(tmp)) 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 */ index = (unsigned long) addr >> 2; if ((addr & 3) || (index > PT_FPSCR32)) break; CHECK_FULL_REGS(child->thread.regs); if (index < PT_FPR0) { ret = ptrace_put_reg(child, index, data); } else { flush_fp_to_thread(child); /* * the user space code considers the floating point * to be an array of unsigned int (32 bits) - the * index passed in is based on this assumption. */ ((unsigned int *)child->thread.fpr) [FPRINDEX(index)] = data; ret = 0; } break; } /* * Write 4 bytes into the other process' pt_regs area * data is the 4 bytes that the user wants written * addr is the offset into the other process' pt_regs structure * that is to be written into * (this is run in a 32-bit process looking at a 64-bit process) */ case PPC_PTRACE_POKEUSR_3264: { u32 index; u32 numReg; ret = -EIO; /* Determine which register the user wants */ index = (u64)addr >> 2; numReg = index / 2; /* * Validate the input - check to see if address is on the * wrong boundary or beyond the end of the user area */ if ((addr & 3) || (numReg > PT_FPSCR)) break; CHECK_FULL_REGS(child->thread.regs); if (numReg < PT_FPR0) { unsigned long freg = ptrace_get_reg(child, numReg); if (index % 2) freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); else freg = (freg & 0xfffffffful) | (data << 32); ret = ptrace_put_reg(child, numReg, freg); } else { u64 *tmp; flush_fp_to_thread(child); /* get 64 bit FPR ... */ tmp = &(((u64 *)child->thread.fpr) [FPRINDEX_3264(numReg)]); /* ... write the 32 bit part we want */ ((u32 *)tmp)[index % 2] = data; ret = 0; } break; } 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, (u32 __user *)data); break; } case PTRACE_GETREGS: /* Get all pt_regs from the child. */ return copy_regset_to_user( child, task_user_regset_view(current), 0, 0, PT_REGS_COUNT * sizeof(compat_long_t), compat_ptr(data)); case PTRACE_SETREGS: /* Set all gp regs in the child. */ return copy_regset_from_user( child, task_user_regset_view(current), 0, 0, PT_REGS_COUNT * sizeof(compat_long_t), compat_ptr(data)); case PTRACE_GETFPREGS: case PTRACE_SETFPREGS: case PTRACE_GETVRREGS: case PTRACE_SETVRREGS: case PTRACE_GETVSRREGS: case PTRACE_SETVSRREGS: case PTRACE_GETREGS64: case PTRACE_SETREGS64: case PPC_PTRACE_GETFPREGS: case PPC_PTRACE_SETFPREGS: case PTRACE_KILL: case PTRACE_SINGLESTEP: case PTRACE_DETACH: case PTRACE_SET_DEBUGREG: case PTRACE_SYSCALL: case PTRACE_CONT: ret = arch_ptrace(child, request, addr, data); break; /* Old reverse args ptrace callss */ case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */ case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */ ret = compat_ptrace_old(child, request, addr, data); break; default: ret = compat_ptrace_request(child, request, addr, data); break; } return ret; }