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309 lines
8.3 KiB
309 lines
8.3 KiB
/* |
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* ptrace for 32-bit processes running on a 64-bit kernel. |
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* |
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* PowerPC version |
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* Copyright (C) 1995-1996 Gary Thomas ([email protected]) |
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* |
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* Derived from "arch/m68k/kernel/ptrace.c" |
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* Copyright (C) 1994 by Hamish Macdonald |
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* Taken from linux/kernel/ptrace.c and modified for M680x0. |
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* linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds |
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* |
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* Modified by Cort Dougan ([email protected]) |
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* and Paul Mackerras ([email protected]). |
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* |
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* This file is subject to the terms and conditions of the GNU General |
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* Public License. See the file COPYING in the main directory of |
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* this archive for more details. |
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*/ |
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#include <linux/ptrace.h> |
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#include <linux/regset.h> |
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#include <linux/compat.h> |
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#include <asm/switch_to.h> |
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#include "ptrace-decl.h" |
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/* |
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* does not yet catch signals sent when the child dies. |
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* in exit.c or in signal.c. |
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*/ |
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/* Macros to workout the correct index for the FPR in the thread struct */ |
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#define FPRNUMBER(i) (((i) - PT_FPR0) >> 1) |
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#define FPRHALF(i) (((i) - PT_FPR0) & 1) |
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#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i) |
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long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
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compat_ulong_t caddr, compat_ulong_t cdata) |
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{ |
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unsigned long addr = caddr; |
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unsigned long data = cdata; |
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int ret; |
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switch (request) { |
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/* |
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* Read 4 bytes of the other process' storage |
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* data is a pointer specifying where the user wants the |
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* 4 bytes copied into |
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* addr is a pointer in the user's storage that contains an 8 byte |
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* address in the other process of the 4 bytes that is to be read |
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* (this is run in a 32-bit process looking at a 64-bit process) |
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* when I and D space are separate, these will need to be fixed. |
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*/ |
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case PPC_PTRACE_PEEKTEXT_3264: |
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case PPC_PTRACE_PEEKDATA_3264: { |
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u32 tmp; |
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int copied; |
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u32 __user * addrOthers; |
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ret = -EIO; |
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/* Get the addr in the other process that we want to read */ |
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if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) |
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break; |
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copied = ptrace_access_vm(child, (u64)addrOthers, &tmp, |
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sizeof(tmp), FOLL_FORCE); |
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if (copied != sizeof(tmp)) |
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break; |
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ret = put_user(tmp, (u32 __user *)data); |
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break; |
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} |
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/* Read a register (specified by ADDR) out of the "user area" */ |
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case PTRACE_PEEKUSR: { |
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int index; |
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unsigned long tmp; |
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ret = -EIO; |
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/* convert to index and check */ |
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index = (unsigned long) addr >> 2; |
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if ((addr & 3) || (index > PT_FPSCR32)) |
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break; |
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CHECK_FULL_REGS(child->thread.regs); |
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if (index < PT_FPR0) { |
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ret = ptrace_get_reg(child, index, &tmp); |
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if (ret) |
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break; |
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} else { |
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flush_fp_to_thread(child); |
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/* |
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* the user space code considers the floating point |
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* to be an array of unsigned int (32 bits) - the |
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* index passed in is based on this assumption. |
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*/ |
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tmp = ((unsigned int *)child->thread.fp_state.fpr) |
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[FPRINDEX(index)]; |
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} |
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ret = put_user((unsigned int)tmp, (u32 __user *)data); |
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break; |
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} |
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/* |
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* Read 4 bytes out of the other process' pt_regs area |
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* data is a pointer specifying where the user wants the |
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* 4 bytes copied into |
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* addr is the offset into the other process' pt_regs structure |
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* that is to be read |
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* (this is run in a 32-bit process looking at a 64-bit process) |
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*/ |
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case PPC_PTRACE_PEEKUSR_3264: { |
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u32 index; |
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u32 reg32bits; |
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u64 tmp; |
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u32 numReg; |
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u32 part; |
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ret = -EIO; |
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/* Determine which register the user wants */ |
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index = (u64)addr >> 2; |
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numReg = index / 2; |
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/* Determine which part of the register the user wants */ |
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if (index % 2) |
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part = 1; /* want the 2nd half of the register (right-most). */ |
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else |
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part = 0; /* want the 1st half of the register (left-most). */ |
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/* Validate the input - check to see if address is on the wrong boundary |
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* or beyond the end of the user area |
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*/ |
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if ((addr & 3) || numReg > PT_FPSCR) |
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break; |
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CHECK_FULL_REGS(child->thread.regs); |
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if (numReg >= PT_FPR0) { |
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flush_fp_to_thread(child); |
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/* get 64 bit FPR */ |
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tmp = child->thread.fp_state.fpr[numReg - PT_FPR0][0]; |
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} else { /* register within PT_REGS struct */ |
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unsigned long tmp2; |
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ret = ptrace_get_reg(child, numReg, &tmp2); |
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if (ret) |
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break; |
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tmp = tmp2; |
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} |
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reg32bits = ((u32*)&tmp)[part]; |
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ret = put_user(reg32bits, (u32 __user *)data); |
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break; |
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} |
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/* |
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* Write 4 bytes into the other process' storage |
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* data is the 4 bytes that the user wants written |
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* addr is a pointer in the user's storage that contains an |
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* 8 byte address in the other process where the 4 bytes |
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* that is to be written |
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* (this is run in a 32-bit process looking at a 64-bit process) |
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* when I and D space are separate, these will need to be fixed. |
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*/ |
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case PPC_PTRACE_POKETEXT_3264: |
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case PPC_PTRACE_POKEDATA_3264: { |
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u32 tmp = data; |
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u32 __user * addrOthers; |
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/* Get the addr in the other process that we want to write into */ |
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ret = -EIO; |
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if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) |
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break; |
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ret = 0; |
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if (ptrace_access_vm(child, (u64)addrOthers, &tmp, |
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sizeof(tmp), |
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FOLL_FORCE | FOLL_WRITE) == sizeof(tmp)) |
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break; |
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ret = -EIO; |
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break; |
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} |
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/* write the word at location addr in the USER area */ |
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case PTRACE_POKEUSR: { |
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unsigned long index; |
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ret = -EIO; |
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/* convert to index and check */ |
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index = (unsigned long) addr >> 2; |
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if ((addr & 3) || (index > PT_FPSCR32)) |
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break; |
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CHECK_FULL_REGS(child->thread.regs); |
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if (index < PT_FPR0) { |
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ret = ptrace_put_reg(child, index, data); |
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} else { |
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flush_fp_to_thread(child); |
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/* |
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* the user space code considers the floating point |
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* to be an array of unsigned int (32 bits) - the |
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* index passed in is based on this assumption. |
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*/ |
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((unsigned int *)child->thread.fp_state.fpr) |
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[FPRINDEX(index)] = data; |
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ret = 0; |
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} |
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break; |
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} |
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/* |
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* Write 4 bytes into the other process' pt_regs area |
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* data is the 4 bytes that the user wants written |
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* addr is the offset into the other process' pt_regs structure |
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* that is to be written into |
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* (this is run in a 32-bit process looking at a 64-bit process) |
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*/ |
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case PPC_PTRACE_POKEUSR_3264: { |
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u32 index; |
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u32 numReg; |
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ret = -EIO; |
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/* Determine which register the user wants */ |
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index = (u64)addr >> 2; |
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numReg = index / 2; |
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/* |
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* Validate the input - check to see if address is on the |
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* wrong boundary or beyond the end of the user area |
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*/ |
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if ((addr & 3) || (numReg > PT_FPSCR)) |
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break; |
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CHECK_FULL_REGS(child->thread.regs); |
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if (numReg < PT_FPR0) { |
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unsigned long freg; |
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ret = ptrace_get_reg(child, numReg, &freg); |
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if (ret) |
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break; |
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if (index % 2) |
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freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); |
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else |
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freg = (freg & 0xfffffffful) | (data << 32); |
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ret = ptrace_put_reg(child, numReg, freg); |
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} else { |
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u64 *tmp; |
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flush_fp_to_thread(child); |
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/* get 64 bit FPR ... */ |
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tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0]; |
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/* ... write the 32 bit part we want */ |
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((u32 *)tmp)[index % 2] = data; |
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ret = 0; |
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} |
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break; |
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} |
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case PTRACE_GET_DEBUGREG: { |
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#ifndef CONFIG_PPC_ADV_DEBUG_REGS |
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unsigned long dabr_fake; |
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#endif |
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ret = -EINVAL; |
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/* We only support one DABR and no IABRS at the moment */ |
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if (addr > 0) |
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break; |
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#ifdef CONFIG_PPC_ADV_DEBUG_REGS |
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ret = put_user(child->thread.debug.dac1, (u32 __user *)data); |
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#else |
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dabr_fake = ( |
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(child->thread.hw_brk[0].address & (~HW_BRK_TYPE_DABR)) | |
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(child->thread.hw_brk[0].type & HW_BRK_TYPE_DABR)); |
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ret = put_user(dabr_fake, (u32 __user *)data); |
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#endif |
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break; |
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} |
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case PTRACE_GETREGS: /* Get all pt_regs from the child. */ |
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return copy_regset_to_user( |
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child, task_user_regset_view(current), 0, |
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0, PT_REGS_COUNT * sizeof(compat_long_t), |
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compat_ptr(data)); |
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case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
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return copy_regset_from_user( |
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child, task_user_regset_view(current), 0, |
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0, PT_REGS_COUNT * sizeof(compat_long_t), |
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compat_ptr(data)); |
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case PTRACE_GETFPREGS: |
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case PTRACE_SETFPREGS: |
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case PTRACE_GETVRREGS: |
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case PTRACE_SETVRREGS: |
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case PTRACE_GETVSRREGS: |
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case PTRACE_SETVSRREGS: |
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case PTRACE_GETREGS64: |
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case PTRACE_SETREGS64: |
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case PTRACE_KILL: |
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case PTRACE_SINGLESTEP: |
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case PTRACE_DETACH: |
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case PTRACE_SET_DEBUGREG: |
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case PTRACE_SYSCALL: |
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case PTRACE_CONT: |
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case PPC_PTRACE_GETHWDBGINFO: |
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case PPC_PTRACE_SETHWDEBUG: |
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case PPC_PTRACE_DELHWDEBUG: |
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ret = arch_ptrace(child, request, addr, data); |
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break; |
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default: |
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ret = compat_ptrace_request(child, request, addr, data); |
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break; |
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} |
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return ret; |
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}
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