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-rw-r--r--arch/powerpc/kernel/ptrace32.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ptrace32.c b/arch/powerpc/kernel/ptrace32.c
new file mode 100644
index 000000000000..61762640b877
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+++ b/arch/powerpc/kernel/ptrace32.c
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+/*
+ * 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/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 <asm/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+
+#include "ptrace-common.h"
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+long compat_sys_ptrace(int request, int pid, unsigned long addr,
+ unsigned long data)
+{
+ struct task_struct *child;
+ int ret = -EPERM;
+
+ lock_kernel();
+ if (request == PTRACE_TRACEME) {
+ /* are we already being traced? */
+ if (current->ptrace & PT_PTRACED)
+ goto out;
+ ret = security_ptrace(current->parent, current);
+ if (ret)
+ goto out;
+ /* set the ptrace bit in the process flags. */
+ current->ptrace |= PT_PTRACED;
+ ret = 0;
+ goto out;
+ }
+ ret = -ESRCH;
+ read_lock(&tasklist_lock);
+ child = find_task_by_pid(pid);
+ if (child)
+ get_task_struct(child);
+ read_unlock(&tasklist_lock);
+ if (!child)
+ goto out;
+
+ ret = -EPERM;
+ if (pid == 1) /* you may not mess with init */
+ goto out_tsk;
+
+ if (request == PTRACE_ATTACH) {
+ ret = ptrace_attach(child);
+ goto out_tsk;
+ }
+
+ ret = ptrace_check_attach(child, request == PTRACE_KILL);
+ if (ret < 0)
+ goto out_tsk;
+
+ 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 int tmp;
+ int copied;
+
+ copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
+ ret = -EIO;
+ if (copied != sizeof(tmp))
+ break;
+ ret = put_user(tmp, (u32 __user *)data);
+ break;
+ }
+
+ /*
+ * 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;
+
+ if (index < PT_FPR0) {
+ tmp = 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;
+
+ 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 = get_reg(child, numReg);
+ }
+ reg32bits = ((u32*)&tmp)[part];
+ ret = put_user(reg32bits, (u32 __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: {
+ unsigned int tmp;
+ tmp = data;
+ ret = 0;
+ if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1)
+ == sizeof(tmp))
+ break;
+ ret = -EIO;
+ 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;
+
+ if (index == PT_ORIG_R3)
+ break;
+ if (index < PT_FPR0) {
+ ret = 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;
+ /* Insure it is a register we let them change */
+ if ((numReg == PT_ORIG_R3)
+ || ((numReg > PT_CCR) && (numReg < PT_FPR0)))
+ break;
+ if (numReg >= PT_FPR0) {
+ flush_fp_to_thread(child);
+ }
+ if (numReg == PT_MSR)
+ data = (data & MSR_DEBUGCHANGE)
+ | (child->thread.regs->msr & ~MSR_DEBUGCHANGE);
+ ((u32*)child->thread.regs)[index] = 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;
+ }
+
+ 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_SET_DEBUGREG:
+ ret = ptrace_set_debugreg(child, addr, data);
+ break;
+
+ 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 int __user *tmp = (unsigned int __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 int __user *tmp = (unsigned int __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 int __user *tmp = (unsigned int __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 int __user *tmp = (unsigned int __user *)addr;
+
+ flush_fp_to_thread(child);
+
+ for (i = 0; i < 32; i++) {
+ ret = get_user(*reg, tmp);
+ if (ret)
+ break;
+ reg++;
+ tmp++;
+ }
+ break;
+ }
+
+ case PTRACE_GETEVENTMSG:
+ ret = put_user(child->ptrace_message, (unsigned int __user *) data);
+ 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
+
+ default:
+ ret = ptrace_request(child, request, addr, data);
+ break;
+ }
+out_tsk:
+ put_task_struct(child);
+out:
+ unlock_kernel();
+ return ret;
+}
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