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780 lines
21 KiB
780 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Kernel support for the ptrace() and syscall tracing interfaces. |
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* |
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* Copyright (C) 2000 Hewlett-Packard Co, Linuxcare Inc. |
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* Copyright (C) 2000 Matthew Wilcox <[email protected]> |
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* Copyright (C) 2000 David Huggins-Daines <[email protected]> |
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* Copyright (C) 2008-2016 Helge Deller <[email protected]> |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/mm.h> |
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#include <linux/smp.h> |
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#include <linux/elf.h> |
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#include <linux/errno.h> |
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#include <linux/ptrace.h> |
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#include <linux/tracehook.h> |
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#include <linux/user.h> |
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#include <linux/personality.h> |
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#include <linux/regset.h> |
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#include <linux/security.h> |
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#include <linux/seccomp.h> |
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#include <linux/compat.h> |
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#include <linux/signal.h> |
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#include <linux/audit.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/processor.h> |
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#include <asm/asm-offsets.h> |
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|
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/* PSW bits we allow the debugger to modify */ |
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#define USER_PSW_BITS (PSW_N | PSW_B | PSW_V | PSW_CB) |
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|
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#define CREATE_TRACE_POINTS |
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#include <trace/events/syscalls.h> |
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|
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/* |
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* These are our native regset flavors. |
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*/ |
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enum parisc_regset { |
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REGSET_GENERAL, |
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REGSET_FP |
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}; |
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|
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/* |
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* Called by kernel/ptrace.c when detaching.. |
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* |
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* Make sure single step bits etc are not set. |
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*/ |
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void ptrace_disable(struct task_struct *task) |
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{ |
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clear_tsk_thread_flag(task, TIF_SINGLESTEP); |
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clear_tsk_thread_flag(task, TIF_BLOCKSTEP); |
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|
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/* make sure the trap bits are not set */ |
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pa_psw(task)->r = 0; |
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pa_psw(task)->t = 0; |
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pa_psw(task)->h = 0; |
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pa_psw(task)->l = 0; |
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} |
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|
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/* |
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* The following functions are called by ptrace_resume() when |
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* enabling or disabling single/block tracing. |
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*/ |
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void user_disable_single_step(struct task_struct *task) |
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{ |
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ptrace_disable(task); |
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} |
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void user_enable_single_step(struct task_struct *task) |
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{ |
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clear_tsk_thread_flag(task, TIF_BLOCKSTEP); |
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set_tsk_thread_flag(task, TIF_SINGLESTEP); |
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|
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if (pa_psw(task)->n) { |
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/* Nullified, just crank over the queue. */ |
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task_regs(task)->iaoq[0] = task_regs(task)->iaoq[1]; |
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task_regs(task)->iasq[0] = task_regs(task)->iasq[1]; |
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task_regs(task)->iaoq[1] = task_regs(task)->iaoq[0] + 4; |
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pa_psw(task)->n = 0; |
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pa_psw(task)->x = 0; |
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pa_psw(task)->y = 0; |
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pa_psw(task)->z = 0; |
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pa_psw(task)->b = 0; |
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ptrace_disable(task); |
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/* Don't wake up the task, but let the |
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parent know something happened. */ |
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force_sig_fault_to_task(SIGTRAP, TRAP_TRACE, |
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(void __user *) (task_regs(task)->iaoq[0] & ~3), |
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task); |
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/* notify_parent(task, SIGCHLD); */ |
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return; |
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} |
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|
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/* Enable recovery counter traps. The recovery counter |
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* itself will be set to zero on a task switch. If the |
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* task is suspended on a syscall then the syscall return |
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* path will overwrite the recovery counter with a suitable |
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* value such that it traps once back in user space. We |
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* disable interrupts in the tasks PSW here also, to avoid |
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* interrupts while the recovery counter is decrementing. |
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*/ |
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pa_psw(task)->r = 1; |
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pa_psw(task)->t = 0; |
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pa_psw(task)->h = 0; |
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pa_psw(task)->l = 0; |
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} |
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void user_enable_block_step(struct task_struct *task) |
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{ |
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clear_tsk_thread_flag(task, TIF_SINGLESTEP); |
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set_tsk_thread_flag(task, TIF_BLOCKSTEP); |
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|
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/* Enable taken branch trap. */ |
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pa_psw(task)->r = 0; |
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pa_psw(task)->t = 1; |
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pa_psw(task)->h = 0; |
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pa_psw(task)->l = 0; |
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} |
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long arch_ptrace(struct task_struct *child, long request, |
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unsigned long addr, unsigned long data) |
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{ |
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unsigned long __user *datap = (unsigned long __user *)data; |
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unsigned long tmp; |
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long ret = -EIO; |
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switch (request) { |
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|
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/* Read the word at location addr in the USER area. For ptraced |
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processes, the kernel saves all regs on a syscall. */ |
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case PTRACE_PEEKUSR: |
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if ((addr & (sizeof(unsigned long)-1)) || |
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addr >= sizeof(struct pt_regs)) |
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break; |
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tmp = *(unsigned long *) ((char *) task_regs(child) + addr); |
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ret = put_user(tmp, datap); |
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break; |
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|
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/* Write the word at location addr in the USER area. This will need |
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to change when the kernel no longer saves all regs on a syscall. |
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FIXME. There is a problem at the moment in that r3-r18 are only |
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saved if the process is ptraced on syscall entry, and even then |
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those values are overwritten by actual register values on syscall |
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exit. */ |
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case PTRACE_POKEUSR: |
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/* Some register values written here may be ignored in |
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* entry.S:syscall_restore_rfi; e.g. iaoq is written with |
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* r31/r31+4, and not with the values in pt_regs. |
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*/ |
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if (addr == PT_PSW) { |
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/* Allow writing to Nullify, Divide-step-correction, |
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* and carry/borrow bits. |
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* BEWARE, if you set N, and then single step, it won't |
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* stop on the nullified instruction. |
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*/ |
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data &= USER_PSW_BITS; |
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task_regs(child)->gr[0] &= ~USER_PSW_BITS; |
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task_regs(child)->gr[0] |= data; |
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ret = 0; |
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break; |
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} |
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if ((addr & (sizeof(unsigned long)-1)) || |
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addr >= sizeof(struct pt_regs)) |
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break; |
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if (addr == PT_IAOQ0 || addr == PT_IAOQ1) { |
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data |= 3; /* ensure userspace privilege */ |
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} |
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if ((addr >= PT_GR1 && addr <= PT_GR31) || |
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addr == PT_IAOQ0 || addr == PT_IAOQ1 || |
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(addr >= PT_FR0 && addr <= PT_FR31 + 4) || |
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addr == PT_SAR) { |
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*(unsigned long *) ((char *) task_regs(child) + addr) = data; |
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ret = 0; |
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} |
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break; |
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case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
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return copy_regset_to_user(child, |
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task_user_regset_view(current), |
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REGSET_GENERAL, |
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0, sizeof(struct user_regs_struct), |
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datap); |
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case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
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return copy_regset_from_user(child, |
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task_user_regset_view(current), |
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REGSET_GENERAL, |
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0, sizeof(struct user_regs_struct), |
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datap); |
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case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
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return copy_regset_to_user(child, |
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task_user_regset_view(current), |
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REGSET_FP, |
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0, sizeof(struct user_fp_struct), |
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datap); |
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case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
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return copy_regset_from_user(child, |
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task_user_regset_view(current), |
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REGSET_FP, |
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0, sizeof(struct user_fp_struct), |
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datap); |
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default: |
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ret = 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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#ifdef CONFIG_COMPAT |
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/* This function is needed to translate 32 bit pt_regs offsets in to |
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* 64 bit pt_regs offsets. For example, a 32 bit gdb under a 64 bit kernel |
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* will request offset 12 if it wants gr3, but the lower 32 bits of |
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* the 64 bit kernels view of gr3 will be at offset 28 (3*8 + 4). |
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* This code relies on a 32 bit pt_regs being comprised of 32 bit values |
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* except for the fp registers which (a) are 64 bits, and (b) follow |
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* the gr registers at the start of pt_regs. The 32 bit pt_regs should |
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* be half the size of the 64 bit pt_regs, plus 32*4 to allow for fr[] |
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* being 64 bit in both cases. |
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*/ |
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static compat_ulong_t translate_usr_offset(compat_ulong_t offset) |
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{ |
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compat_ulong_t pos; |
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if (offset < 32*4) /* gr[0..31] */ |
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pos = offset * 2 + 4; |
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else if (offset < 32*4+32*8) /* fr[0] ... fr[31] */ |
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pos = (offset - 32*4) + PT_FR0; |
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else if (offset < sizeof(struct pt_regs)/2 + 32*4) /* sr[0] ... ipsw */ |
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pos = (offset - 32*4 - 32*8) * 2 + PT_SR0 + 4; |
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else |
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pos = sizeof(struct pt_regs); |
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return pos; |
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} |
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long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
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compat_ulong_t addr, compat_ulong_t data) |
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{ |
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compat_uint_t tmp; |
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long ret = -EIO; |
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switch (request) { |
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case PTRACE_PEEKUSR: |
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if (addr & (sizeof(compat_uint_t)-1)) |
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break; |
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addr = translate_usr_offset(addr); |
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if (addr >= sizeof(struct pt_regs)) |
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break; |
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tmp = *(compat_uint_t *) ((char *) task_regs(child) + addr); |
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ret = put_user(tmp, (compat_uint_t *) (unsigned long) data); |
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break; |
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/* Write the word at location addr in the USER area. This will need |
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to change when the kernel no longer saves all regs on a syscall. |
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FIXME. There is a problem at the moment in that r3-r18 are only |
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saved if the process is ptraced on syscall entry, and even then |
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those values are overwritten by actual register values on syscall |
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exit. */ |
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case PTRACE_POKEUSR: |
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/* Some register values written here may be ignored in |
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* entry.S:syscall_restore_rfi; e.g. iaoq is written with |
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* r31/r31+4, and not with the values in pt_regs. |
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*/ |
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if (addr == PT_PSW) { |
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/* Since PT_PSW==0, it is valid for 32 bit processes |
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* under 64 bit kernels as well. |
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*/ |
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ret = arch_ptrace(child, request, addr, data); |
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} else { |
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if (addr & (sizeof(compat_uint_t)-1)) |
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break; |
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addr = translate_usr_offset(addr); |
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if (addr >= sizeof(struct pt_regs)) |
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break; |
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if (addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4) { |
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data |= 3; /* ensure userspace privilege */ |
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} |
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if (addr >= PT_FR0 && addr <= PT_FR31 + 4) { |
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/* Special case, fp regs are 64 bits anyway */ |
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*(__u32 *) ((char *) task_regs(child) + addr) = data; |
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ret = 0; |
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} |
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else if ((addr >= PT_GR1+4 && addr <= PT_GR31+4) || |
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addr == PT_IAOQ0+4 || addr == PT_IAOQ1+4 || |
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addr == PT_SAR+4) { |
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/* Zero the top 32 bits */ |
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*(__u32 *) ((char *) task_regs(child) + addr - 4) = 0; |
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*(__u32 *) ((char *) task_regs(child) + addr) = data; |
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ret = 0; |
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} |
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} |
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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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#endif |
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long do_syscall_trace_enter(struct pt_regs *regs) |
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{ |
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if (test_thread_flag(TIF_SYSCALL_TRACE)) { |
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int rc = tracehook_report_syscall_entry(regs); |
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/* |
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* As tracesys_next does not set %r28 to -ENOSYS |
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* when %r20 is set to -1, initialize it here. |
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*/ |
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regs->gr[28] = -ENOSYS; |
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if (rc) { |
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/* |
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* A nonzero return code from |
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* tracehook_report_syscall_entry() tells us |
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* to prevent the syscall execution. Skip |
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* the syscall call and the syscall restart handling. |
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* |
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* Note that the tracer may also just change |
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* regs->gr[20] to an invalid syscall number, |
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* that is handled by tracesys_next. |
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*/ |
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regs->gr[20] = -1UL; |
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return -1; |
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} |
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} |
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/* Do the secure computing check after ptrace. */ |
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if (secure_computing() == -1) |
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return -1; |
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#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
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if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
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trace_sys_enter(regs, regs->gr[20]); |
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#endif |
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#ifdef CONFIG_64BIT |
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if (!is_compat_task()) |
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audit_syscall_entry(regs->gr[20], regs->gr[26], regs->gr[25], |
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regs->gr[24], regs->gr[23]); |
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else |
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#endif |
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audit_syscall_entry(regs->gr[20] & 0xffffffff, |
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regs->gr[26] & 0xffffffff, |
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regs->gr[25] & 0xffffffff, |
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regs->gr[24] & 0xffffffff, |
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regs->gr[23] & 0xffffffff); |
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/* |
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* Sign extend the syscall number to 64bit since it may have been |
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* modified by a compat ptrace call |
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*/ |
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return (int) ((u32) regs->gr[20]); |
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} |
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void do_syscall_trace_exit(struct pt_regs *regs) |
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{ |
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int stepping = test_thread_flag(TIF_SINGLESTEP) || |
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test_thread_flag(TIF_BLOCKSTEP); |
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audit_syscall_exit(regs); |
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#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS |
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if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
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trace_sys_exit(regs, regs->gr[20]); |
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#endif |
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if (stepping || test_thread_flag(TIF_SYSCALL_TRACE)) |
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tracehook_report_syscall_exit(regs, stepping); |
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} |
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/* |
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* regset functions. |
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*/ |
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static int fpr_get(struct task_struct *target, |
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const struct user_regset *regset, |
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struct membuf to) |
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{ |
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struct pt_regs *regs = task_regs(target); |
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return membuf_write(&to, regs->fr, ELF_NFPREG * sizeof(__u64)); |
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} |
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static int fpr_set(struct task_struct *target, |
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const struct user_regset *regset, |
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unsigned int pos, unsigned int count, |
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const void *kbuf, const void __user *ubuf) |
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{ |
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struct pt_regs *regs = task_regs(target); |
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const __u64 *k = kbuf; |
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const __u64 __user *u = ubuf; |
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__u64 reg; |
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pos /= sizeof(reg); |
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count /= sizeof(reg); |
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if (kbuf) |
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for (; count > 0 && pos < ELF_NFPREG; --count) |
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regs->fr[pos++] = *k++; |
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else |
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for (; count > 0 && pos < ELF_NFPREG; --count) { |
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if (__get_user(reg, u++)) |
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return -EFAULT; |
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regs->fr[pos++] = reg; |
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} |
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kbuf = k; |
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ubuf = u; |
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pos *= sizeof(reg); |
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count *= sizeof(reg); |
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return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
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ELF_NFPREG * sizeof(reg), -1); |
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} |
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#define RI(reg) (offsetof(struct user_regs_struct,reg) / sizeof(long)) |
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|
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static unsigned long get_reg(struct pt_regs *regs, int num) |
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{ |
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switch (num) { |
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case RI(gr[0]) ... RI(gr[31]): return regs->gr[num - RI(gr[0])]; |
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case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])]; |
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case RI(iasq[0]): return regs->iasq[0]; |
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case RI(iasq[1]): return regs->iasq[1]; |
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case RI(iaoq[0]): return regs->iaoq[0]; |
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case RI(iaoq[1]): return regs->iaoq[1]; |
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case RI(sar): return regs->sar; |
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case RI(iir): return regs->iir; |
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case RI(isr): return regs->isr; |
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case RI(ior): return regs->ior; |
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case RI(ipsw): return regs->ipsw; |
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case RI(cr27): return regs->cr27; |
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case RI(cr0): return mfctl(0); |
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case RI(cr24): return mfctl(24); |
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case RI(cr25): return mfctl(25); |
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case RI(cr26): return mfctl(26); |
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case RI(cr28): return mfctl(28); |
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case RI(cr29): return mfctl(29); |
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case RI(cr30): return mfctl(30); |
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case RI(cr31): return mfctl(31); |
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case RI(cr8): return mfctl(8); |
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case RI(cr9): return mfctl(9); |
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case RI(cr12): return mfctl(12); |
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case RI(cr13): return mfctl(13); |
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case RI(cr10): return mfctl(10); |
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case RI(cr15): return mfctl(15); |
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default: return 0; |
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} |
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} |
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|
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static void set_reg(struct pt_regs *regs, int num, unsigned long val) |
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{ |
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switch (num) { |
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case RI(gr[0]): /* |
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* PSW is in gr[0]. |
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* Allow writing to Nullify, Divide-step-correction, |
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* and carry/borrow bits. |
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* BEWARE, if you set N, and then single step, it won't |
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* stop on the nullified instruction. |
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*/ |
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val &= USER_PSW_BITS; |
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regs->gr[0] &= ~USER_PSW_BITS; |
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regs->gr[0] |= val; |
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return; |
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case RI(gr[1]) ... RI(gr[31]): |
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regs->gr[num - RI(gr[0])] = val; |
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return; |
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case RI(iaoq[0]): |
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case RI(iaoq[1]): |
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/* set 2 lowest bits to ensure userspace privilege: */ |
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regs->iaoq[num - RI(iaoq[0])] = val | 3; |
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return; |
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case RI(sar): regs->sar = val; |
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return; |
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default: return; |
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#if 0 |
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/* do not allow to change any of the following registers (yet) */ |
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case RI(sr[0]) ... RI(sr[7]): return regs->sr[num - RI(sr[0])]; |
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case RI(iasq[0]): return regs->iasq[0]; |
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case RI(iasq[1]): return regs->iasq[1]; |
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case RI(iir): return regs->iir; |
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case RI(isr): return regs->isr; |
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case RI(ior): return regs->ior; |
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case RI(ipsw): return regs->ipsw; |
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case RI(cr27): return regs->cr27; |
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case cr0, cr24, cr25, cr26, cr27, cr28, cr29, cr30, cr31; |
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case cr8, cr9, cr12, cr13, cr10, cr15; |
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#endif |
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} |
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} |
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|
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static int gpr_get(struct task_struct *target, |
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const struct user_regset *regset, |
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struct membuf to) |
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{ |
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struct pt_regs *regs = task_regs(target); |
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unsigned int pos; |
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|
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for (pos = 0; pos < ELF_NGREG; pos++) |
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membuf_store(&to, get_reg(regs, pos)); |
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return 0; |
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} |
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|
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static int gpr_set(struct task_struct *target, |
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const struct user_regset *regset, |
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unsigned int pos, unsigned int count, |
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const void *kbuf, const void __user *ubuf) |
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{ |
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struct pt_regs *regs = task_regs(target); |
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const unsigned long *k = kbuf; |
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const unsigned long __user *u = ubuf; |
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unsigned long reg; |
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pos /= sizeof(reg); |
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count /= sizeof(reg); |
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|
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if (kbuf) |
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for (; count > 0 && pos < ELF_NGREG; --count) |
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set_reg(regs, pos++, *k++); |
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else |
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for (; count > 0 && pos < ELF_NGREG; --count) { |
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if (__get_user(reg, u++)) |
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return -EFAULT; |
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set_reg(regs, pos++, reg); |
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} |
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|
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kbuf = k; |
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ubuf = u; |
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pos *= sizeof(reg); |
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count *= sizeof(reg); |
|
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
|
ELF_NGREG * sizeof(reg), -1); |
|
} |
|
|
|
static const struct user_regset native_regsets[] = { |
|
[REGSET_GENERAL] = { |
|
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG, |
|
.size = sizeof(long), .align = sizeof(long), |
|
.regset_get = gpr_get, .set = gpr_set |
|
}, |
|
[REGSET_FP] = { |
|
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG, |
|
.size = sizeof(__u64), .align = sizeof(__u64), |
|
.regset_get = fpr_get, .set = fpr_set |
|
} |
|
}; |
|
|
|
static const struct user_regset_view user_parisc_native_view = { |
|
.name = "parisc", .e_machine = ELF_ARCH, .ei_osabi = ELFOSABI_LINUX, |
|
.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets) |
|
}; |
|
|
|
#ifdef CONFIG_64BIT |
|
static int gpr32_get(struct task_struct *target, |
|
const struct user_regset *regset, |
|
struct membuf to) |
|
{ |
|
struct pt_regs *regs = task_regs(target); |
|
unsigned int pos; |
|
|
|
for (pos = 0; pos < ELF_NGREG; pos++) |
|
membuf_store(&to, (compat_ulong_t)get_reg(regs, pos)); |
|
|
|
return 0; |
|
} |
|
|
|
static int gpr32_set(struct task_struct *target, |
|
const struct user_regset *regset, |
|
unsigned int pos, unsigned int count, |
|
const void *kbuf, const void __user *ubuf) |
|
{ |
|
struct pt_regs *regs = task_regs(target); |
|
const compat_ulong_t *k = kbuf; |
|
const compat_ulong_t __user *u = ubuf; |
|
compat_ulong_t reg; |
|
|
|
pos /= sizeof(reg); |
|
count /= sizeof(reg); |
|
|
|
if (kbuf) |
|
for (; count > 0 && pos < ELF_NGREG; --count) |
|
set_reg(regs, pos++, *k++); |
|
else |
|
for (; count > 0 && pos < ELF_NGREG; --count) { |
|
if (__get_user(reg, u++)) |
|
return -EFAULT; |
|
set_reg(regs, pos++, reg); |
|
} |
|
|
|
kbuf = k; |
|
ubuf = u; |
|
pos *= sizeof(reg); |
|
count *= sizeof(reg); |
|
return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
|
ELF_NGREG * sizeof(reg), -1); |
|
} |
|
|
|
/* |
|
* These are the regset flavors matching the 32bit native set. |
|
*/ |
|
static const struct user_regset compat_regsets[] = { |
|
[REGSET_GENERAL] = { |
|
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG, |
|
.size = sizeof(compat_long_t), .align = sizeof(compat_long_t), |
|
.regset_get = gpr32_get, .set = gpr32_set |
|
}, |
|
[REGSET_FP] = { |
|
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG, |
|
.size = sizeof(__u64), .align = sizeof(__u64), |
|
.regset_get = fpr_get, .set = fpr_set |
|
} |
|
}; |
|
|
|
static const struct user_regset_view user_parisc_compat_view = { |
|
.name = "parisc", .e_machine = EM_PARISC, .ei_osabi = ELFOSABI_LINUX, |
|
.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets) |
|
}; |
|
#endif /* CONFIG_64BIT */ |
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
|
{ |
|
BUILD_BUG_ON(sizeof(struct user_regs_struct)/sizeof(long) != ELF_NGREG); |
|
BUILD_BUG_ON(sizeof(struct user_fp_struct)/sizeof(__u64) != ELF_NFPREG); |
|
#ifdef CONFIG_64BIT |
|
if (is_compat_task()) |
|
return &user_parisc_compat_view; |
|
#endif |
|
return &user_parisc_native_view; |
|
} |
|
|
|
|
|
/* HAVE_REGS_AND_STACK_ACCESS_API feature */ |
|
|
|
struct pt_regs_offset { |
|
const char *name; |
|
int offset; |
|
}; |
|
|
|
#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} |
|
#define REG_OFFSET_INDEX(r,i) {.name = #r#i, .offset = offsetof(struct pt_regs, r[i])} |
|
#define REG_OFFSET_END {.name = NULL, .offset = 0} |
|
|
|
static const struct pt_regs_offset regoffset_table[] = { |
|
REG_OFFSET_INDEX(gr,0), |
|
REG_OFFSET_INDEX(gr,1), |
|
REG_OFFSET_INDEX(gr,2), |
|
REG_OFFSET_INDEX(gr,3), |
|
REG_OFFSET_INDEX(gr,4), |
|
REG_OFFSET_INDEX(gr,5), |
|
REG_OFFSET_INDEX(gr,6), |
|
REG_OFFSET_INDEX(gr,7), |
|
REG_OFFSET_INDEX(gr,8), |
|
REG_OFFSET_INDEX(gr,9), |
|
REG_OFFSET_INDEX(gr,10), |
|
REG_OFFSET_INDEX(gr,11), |
|
REG_OFFSET_INDEX(gr,12), |
|
REG_OFFSET_INDEX(gr,13), |
|
REG_OFFSET_INDEX(gr,14), |
|
REG_OFFSET_INDEX(gr,15), |
|
REG_OFFSET_INDEX(gr,16), |
|
REG_OFFSET_INDEX(gr,17), |
|
REG_OFFSET_INDEX(gr,18), |
|
REG_OFFSET_INDEX(gr,19), |
|
REG_OFFSET_INDEX(gr,20), |
|
REG_OFFSET_INDEX(gr,21), |
|
REG_OFFSET_INDEX(gr,22), |
|
REG_OFFSET_INDEX(gr,23), |
|
REG_OFFSET_INDEX(gr,24), |
|
REG_OFFSET_INDEX(gr,25), |
|
REG_OFFSET_INDEX(gr,26), |
|
REG_OFFSET_INDEX(gr,27), |
|
REG_OFFSET_INDEX(gr,28), |
|
REG_OFFSET_INDEX(gr,29), |
|
REG_OFFSET_INDEX(gr,30), |
|
REG_OFFSET_INDEX(gr,31), |
|
REG_OFFSET_INDEX(sr,0), |
|
REG_OFFSET_INDEX(sr,1), |
|
REG_OFFSET_INDEX(sr,2), |
|
REG_OFFSET_INDEX(sr,3), |
|
REG_OFFSET_INDEX(sr,4), |
|
REG_OFFSET_INDEX(sr,5), |
|
REG_OFFSET_INDEX(sr,6), |
|
REG_OFFSET_INDEX(sr,7), |
|
REG_OFFSET_INDEX(iasq,0), |
|
REG_OFFSET_INDEX(iasq,1), |
|
REG_OFFSET_INDEX(iaoq,0), |
|
REG_OFFSET_INDEX(iaoq,1), |
|
REG_OFFSET_NAME(cr27), |
|
REG_OFFSET_NAME(ksp), |
|
REG_OFFSET_NAME(kpc), |
|
REG_OFFSET_NAME(sar), |
|
REG_OFFSET_NAME(iir), |
|
REG_OFFSET_NAME(isr), |
|
REG_OFFSET_NAME(ior), |
|
REG_OFFSET_NAME(ipsw), |
|
REG_OFFSET_END, |
|
}; |
|
|
|
/** |
|
* regs_query_register_offset() - query register offset from its name |
|
* @name: the name of a register |
|
* |
|
* regs_query_register_offset() returns the offset of a register in struct |
|
* pt_regs from its name. If the name is invalid, this returns -EINVAL; |
|
*/ |
|
int regs_query_register_offset(const char *name) |
|
{ |
|
const struct pt_regs_offset *roff; |
|
for (roff = regoffset_table; roff->name != NULL; roff++) |
|
if (!strcmp(roff->name, name)) |
|
return roff->offset; |
|
return -EINVAL; |
|
} |
|
|
|
/** |
|
* regs_query_register_name() - query register name from its offset |
|
* @offset: the offset of a register in struct pt_regs. |
|
* |
|
* regs_query_register_name() returns the name of a register from its |
|
* offset in struct pt_regs. If the @offset is invalid, this returns NULL; |
|
*/ |
|
const char *regs_query_register_name(unsigned int offset) |
|
{ |
|
const struct pt_regs_offset *roff; |
|
for (roff = regoffset_table; roff->name != NULL; roff++) |
|
if (roff->offset == offset) |
|
return roff->name; |
|
return NULL; |
|
} |
|
|
|
/** |
|
* regs_within_kernel_stack() - check the address in the stack |
|
* @regs: pt_regs which contains kernel stack pointer. |
|
* @addr: address which is checked. |
|
* |
|
* regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
|
* If @addr is within the kernel stack, it returns true. If not, returns false. |
|
*/ |
|
int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) |
|
{ |
|
return ((addr & ~(THREAD_SIZE - 1)) == |
|
(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); |
|
} |
|
|
|
/** |
|
* regs_get_kernel_stack_nth() - get Nth entry of the stack |
|
* @regs: pt_regs which contains kernel stack pointer. |
|
* @n: stack entry number. |
|
* |
|
* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
|
* is specified by @regs. If the @n th entry is NOT in the kernel stack, |
|
* this returns 0. |
|
*/ |
|
unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) |
|
{ |
|
unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); |
|
|
|
addr -= n; |
|
|
|
if (!regs_within_kernel_stack(regs, (unsigned long)addr)) |
|
return 0; |
|
|
|
return *addr; |
|
}
|
|
|