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-rw-r--r--arch/powerpc/kernel/ptrace32.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ptrace32.c b/arch/powerpc/kernel/ptrace32.c
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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/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 <linux/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/switch_to.h>
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+/* 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)
+
+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 = ptrace_access_vm(child, (u64)addrOthers, &tmp,
+ sizeof(tmp), FOLL_FORCE);
+ 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) {
+ ret = ptrace_get_reg(child, index, &tmp);
+ if (ret)
+ break;
+ } 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.fp_state.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 = child->thread.fp_state.fpr[numReg - PT_FPR0][0];
+ } else { /* register within PT_REGS struct */
+ unsigned long tmp2;
+ ret = ptrace_get_reg(child, numReg, &tmp2);
+ if (ret)
+ break;
+ tmp = tmp2;
+ }
+ 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 (ptrace_access_vm(child, (u64)addrOthers, &tmp,
+ sizeof(tmp),
+ FOLL_FORCE | FOLL_WRITE) == 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.fp_state.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;
+ ret = ptrace_get_reg(child, numReg, &freg);
+ if (ret)
+ break;
+ 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 = &child->thread.fp_state.fpr[numReg - PT_FPR0][0];
+ /* ... write the 32 bit part we want */
+ ((u32 *)tmp)[index % 2] = data;
+ ret = 0;
+ }
+ break;
+ }
+
+ case PTRACE_GET_DEBUGREG: {
+#ifndef CONFIG_PPC_ADV_DEBUG_REGS
+ unsigned long dabr_fake;
+#endif
+ ret = -EINVAL;
+ /* We only support one DABR and no IABRS at the moment */
+ if (addr > 0)
+ break;
+#ifdef CONFIG_PPC_ADV_DEBUG_REGS
+ ret = put_user(child->thread.debug.dac1, (u32 __user *)data);
+#else
+ dabr_fake = (
+ (child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) |
+ (child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
+ ret = put_user(dabr_fake, (u32 __user *)data);
+#endif
+ 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 PTRACE_KILL:
+ case PTRACE_SINGLESTEP:
+ case PTRACE_DETACH:
+ case PTRACE_SET_DEBUGREG:
+ case PTRACE_SYSCALL:
+ case PTRACE_CONT:
+ case PPC_PTRACE_GETHWDBGINFO:
+ case PPC_PTRACE_SETHWDEBUG:
+ case PPC_PTRACE_DELHWDEBUG:
+ ret = arch_ptrace(child, request, addr, data);
+ break;
+
+ default:
+ ret = compat_ptrace_request(child, request, addr, data);
+ break;
+ }
+
+ return ret;
+}
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