| /* |
| * 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/smp_lock.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 <linux/elf.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/system.h> |
| |
| #include "ppc32.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; |
| } |
| |
| static int compat_ptrace_getsiginfo(struct task_struct *child, compat_siginfo_t __user *data) |
| { |
| siginfo_t lastinfo; |
| int error = -ESRCH; |
| |
| read_lock(&tasklist_lock); |
| if (likely(child->sighand != NULL)) { |
| error = -EINVAL; |
| spin_lock_irq(&child->sighand->siglock); |
| if (likely(child->last_siginfo != NULL)) { |
| lastinfo = *child->last_siginfo; |
| error = 0; |
| } |
| spin_unlock_irq(&child->sighand->siglock); |
| } |
| read_unlock(&tasklist_lock); |
| if (!error) |
| return copy_siginfo_to_user32(data, &lastinfo); |
| return error; |
| } |
| |
| 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)[index - PT_FPR0]; |
| } |
| 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); |
| tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0]; |
| } 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)[index - PT_FPR0] = 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 { |
| flush_fp_to_thread(child); |
| ((unsigned int *)child->thread.regs)[index] = 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_GETSIGINFO: |
| return compat_ptrace_getsiginfo(child, compat_ptr(data)); |
| |
| case PTRACE_GETFPREGS: |
| case PTRACE_SETFPREGS: |
| case PTRACE_GETVRREGS: |
| case PTRACE_SETVRREGS: |
| 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; |
| } |