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935 lines
22 KiB
935 lines
22 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/kernel/ptrace.c |
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* |
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* By Ross Biro 1/23/92 |
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* edited by Linus Torvalds |
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* ARM modifications Copyright (C) 2000 Russell King |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/mm.h> |
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#include <linux/elf.h> |
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#include <linux/smp.h> |
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#include <linux/ptrace.h> |
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#include <linux/user.h> |
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#include <linux/security.h> |
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#include <linux/init.h> |
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#include <linux/signal.h> |
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#include <linux/uaccess.h> |
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#include <linux/perf_event.h> |
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#include <linux/hw_breakpoint.h> |
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#include <linux/regset.h> |
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#include <linux/audit.h> |
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#include <linux/tracehook.h> |
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#include <linux/unistd.h> |
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|
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#include <asm/traps.h> |
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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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#define REG_PC 15 |
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#define REG_PSR 16 |
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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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|
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#if 0 |
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/* |
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* Breakpoint SWI instruction: SWI &9F0001 |
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*/ |
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#define BREAKINST_ARM 0xef9f0001 |
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#define BREAKINST_THUMB 0xdf00 /* fill this in later */ |
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#else |
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/* |
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* New breakpoints - use an undefined instruction. The ARM architecture |
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* reference manual guarantees that the following instruction space |
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* will produce an undefined instruction exception on all CPUs: |
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* |
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* ARM: xxxx 0111 1111 xxxx xxxx xxxx 1111 xxxx |
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* Thumb: 1101 1110 xxxx xxxx |
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*/ |
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#define BREAKINST_ARM 0xe7f001f0 |
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#define BREAKINST_THUMB 0xde01 |
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#endif |
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|
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struct pt_regs_offset { |
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const char *name; |
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int offset; |
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}; |
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|
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#define REG_OFFSET_NAME(r) \ |
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{.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)} |
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#define REG_OFFSET_END {.name = NULL, .offset = 0} |
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|
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static const struct pt_regs_offset regoffset_table[] = { |
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REG_OFFSET_NAME(r0), |
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REG_OFFSET_NAME(r1), |
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REG_OFFSET_NAME(r2), |
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REG_OFFSET_NAME(r3), |
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REG_OFFSET_NAME(r4), |
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REG_OFFSET_NAME(r5), |
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REG_OFFSET_NAME(r6), |
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REG_OFFSET_NAME(r7), |
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REG_OFFSET_NAME(r8), |
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REG_OFFSET_NAME(r9), |
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REG_OFFSET_NAME(r10), |
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REG_OFFSET_NAME(fp), |
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REG_OFFSET_NAME(ip), |
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REG_OFFSET_NAME(sp), |
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REG_OFFSET_NAME(lr), |
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REG_OFFSET_NAME(pc), |
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REG_OFFSET_NAME(cpsr), |
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REG_OFFSET_NAME(ORIG_r0), |
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REG_OFFSET_END, |
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}; |
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|
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/** |
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* regs_query_register_offset() - query register offset from its name |
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* @name: the name of a register |
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* |
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* regs_query_register_offset() returns the offset of a register in struct |
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* pt_regs from its name. If the name is invalid, this returns -EINVAL; |
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*/ |
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int regs_query_register_offset(const char *name) |
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{ |
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const struct pt_regs_offset *roff; |
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for (roff = regoffset_table; roff->name != NULL; roff++) |
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if (!strcmp(roff->name, name)) |
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return roff->offset; |
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return -EINVAL; |
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} |
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|
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/** |
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* regs_query_register_name() - query register name from its offset |
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* @offset: the offset of a register in struct pt_regs. |
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* |
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* regs_query_register_name() returns the name of a register from its |
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* offset in struct pt_regs. If the @offset is invalid, this returns NULL; |
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*/ |
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const char *regs_query_register_name(unsigned int offset) |
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{ |
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const struct pt_regs_offset *roff; |
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for (roff = regoffset_table; roff->name != NULL; roff++) |
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if (roff->offset == offset) |
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return roff->name; |
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return NULL; |
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} |
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|
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/** |
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* regs_within_kernel_stack() - check the address in the stack |
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* @regs: pt_regs which contains kernel stack pointer. |
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* @addr: address which is checked. |
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* |
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* regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
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* If @addr is within the kernel stack, it returns true. If not, returns false. |
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*/ |
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bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) |
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{ |
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return ((addr & ~(THREAD_SIZE - 1)) == |
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(kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); |
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} |
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|
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/** |
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* regs_get_kernel_stack_nth() - get Nth entry of the stack |
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* @regs: pt_regs which contains kernel stack pointer. |
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* @n: stack entry number. |
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* |
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* regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
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* is specified by @regs. If the @n th entry is NOT in the kernel stack, |
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* this returns 0. |
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*/ |
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unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) |
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{ |
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unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); |
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addr += n; |
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if (regs_within_kernel_stack(regs, (unsigned long)addr)) |
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return *addr; |
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else |
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return 0; |
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} |
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|
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/* |
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* this routine will get a word off of the processes privileged stack. |
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* the offset is how far from the base addr as stored in the THREAD. |
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* this routine assumes that all the privileged stacks are in our |
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* data space. |
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*/ |
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static inline long get_user_reg(struct task_struct *task, int offset) |
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{ |
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return task_pt_regs(task)->uregs[offset]; |
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} |
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|
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/* |
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* this routine will put a word on the processes privileged stack. |
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* the offset is how far from the base addr as stored in the THREAD. |
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* this routine assumes that all the privileged stacks are in our |
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* data space. |
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*/ |
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static inline int |
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put_user_reg(struct task_struct *task, int offset, long data) |
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{ |
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struct pt_regs newregs, *regs = task_pt_regs(task); |
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int ret = -EINVAL; |
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|
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newregs = *regs; |
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newregs.uregs[offset] = data; |
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|
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if (valid_user_regs(&newregs)) { |
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regs->uregs[offset] = data; |
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ret = 0; |
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} |
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|
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return ret; |
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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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void ptrace_disable(struct task_struct *child) |
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{ |
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/* Nothing to do. */ |
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} |
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|
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/* |
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* Handle hitting a breakpoint. |
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*/ |
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void ptrace_break(struct pt_regs *regs) |
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{ |
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force_sig_fault(SIGTRAP, TRAP_BRKPT, |
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(void __user *)instruction_pointer(regs)); |
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} |
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|
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static int break_trap(struct pt_regs *regs, unsigned int instr) |
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{ |
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ptrace_break(regs); |
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return 0; |
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} |
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|
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static struct undef_hook arm_break_hook = { |
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.instr_mask = 0x0fffffff, |
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.instr_val = 0x07f001f0, |
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.cpsr_mask = PSR_T_BIT, |
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.cpsr_val = 0, |
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.fn = break_trap, |
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}; |
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|
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static struct undef_hook thumb_break_hook = { |
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.instr_mask = 0xffffffff, |
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.instr_val = 0x0000de01, |
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.cpsr_mask = PSR_T_BIT, |
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.cpsr_val = PSR_T_BIT, |
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.fn = break_trap, |
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}; |
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|
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static struct undef_hook thumb2_break_hook = { |
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.instr_mask = 0xffffffff, |
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.instr_val = 0xf7f0a000, |
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.cpsr_mask = PSR_T_BIT, |
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.cpsr_val = PSR_T_BIT, |
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.fn = break_trap, |
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}; |
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|
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static int __init ptrace_break_init(void) |
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{ |
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register_undef_hook(&arm_break_hook); |
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register_undef_hook(&thumb_break_hook); |
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register_undef_hook(&thumb2_break_hook); |
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return 0; |
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} |
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|
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core_initcall(ptrace_break_init); |
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|
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/* |
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* Read the word at offset "off" into the "struct user". We |
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* actually access the pt_regs stored on the kernel stack. |
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*/ |
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static int ptrace_read_user(struct task_struct *tsk, unsigned long off, |
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unsigned long __user *ret) |
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{ |
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unsigned long tmp; |
|
|
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if (off & 3) |
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return -EIO; |
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|
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tmp = 0; |
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if (off == PT_TEXT_ADDR) |
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tmp = tsk->mm->start_code; |
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else if (off == PT_DATA_ADDR) |
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tmp = tsk->mm->start_data; |
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else if (off == PT_TEXT_END_ADDR) |
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tmp = tsk->mm->end_code; |
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else if (off < sizeof(struct pt_regs)) |
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tmp = get_user_reg(tsk, off >> 2); |
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else if (off >= sizeof(struct user)) |
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return -EIO; |
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|
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return put_user(tmp, ret); |
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} |
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|
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/* |
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* Write the word at offset "off" into "struct user". We |
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* actually access the pt_regs stored on the kernel stack. |
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*/ |
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static int ptrace_write_user(struct task_struct *tsk, unsigned long off, |
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unsigned long val) |
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{ |
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if (off & 3 || off >= sizeof(struct user)) |
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return -EIO; |
|
|
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if (off >= sizeof(struct pt_regs)) |
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return 0; |
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|
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return put_user_reg(tsk, off >> 2, val); |
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} |
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|
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#ifdef CONFIG_IWMMXT |
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|
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/* |
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* Get the child iWMMXt state. |
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*/ |
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static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp) |
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{ |
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struct thread_info *thread = task_thread_info(tsk); |
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|
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if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) |
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return -ENODATA; |
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iwmmxt_task_disable(thread); /* force it to ram */ |
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return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE) |
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? -EFAULT : 0; |
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} |
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|
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/* |
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* Set the child iWMMXt state. |
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*/ |
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static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp) |
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{ |
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struct thread_info *thread = task_thread_info(tsk); |
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|
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if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) |
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return -EACCES; |
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iwmmxt_task_release(thread); /* force a reload */ |
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return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE) |
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? -EFAULT : 0; |
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} |
|
|
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#endif |
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|
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#ifdef CONFIG_CRUNCH |
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/* |
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* Get the child Crunch state. |
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*/ |
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static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp) |
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{ |
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struct thread_info *thread = task_thread_info(tsk); |
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|
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crunch_task_disable(thread); /* force it to ram */ |
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return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE) |
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? -EFAULT : 0; |
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} |
|
|
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/* |
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* Set the child Crunch state. |
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*/ |
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static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp) |
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{ |
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struct thread_info *thread = task_thread_info(tsk); |
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|
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crunch_task_release(thread); /* force a reload */ |
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return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE) |
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? -EFAULT : 0; |
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} |
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#endif |
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|
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#ifdef CONFIG_HAVE_HW_BREAKPOINT |
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/* |
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* Convert a virtual register number into an index for a thread_info |
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* breakpoint array. Breakpoints are identified using positive numbers |
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* whilst watchpoints are negative. The registers are laid out as pairs |
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* of (address, control), each pair mapping to a unique hw_breakpoint struct. |
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* Register 0 is reserved for describing resource information. |
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*/ |
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static int ptrace_hbp_num_to_idx(long num) |
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{ |
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if (num < 0) |
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num = (ARM_MAX_BRP << 1) - num; |
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return (num - 1) >> 1; |
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} |
|
|
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/* |
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* Returns the virtual register number for the address of the |
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* breakpoint at index idx. |
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*/ |
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static long ptrace_hbp_idx_to_num(int idx) |
|
{ |
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long mid = ARM_MAX_BRP << 1; |
|
long num = (idx << 1) + 1; |
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return num > mid ? mid - num : num; |
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} |
|
|
|
/* |
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* Handle hitting a HW-breakpoint. |
|
*/ |
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static void ptrace_hbptriggered(struct perf_event *bp, |
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struct perf_sample_data *data, |
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struct pt_regs *regs) |
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{ |
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struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); |
|
long num; |
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int i; |
|
|
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for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i) |
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if (current->thread.debug.hbp[i] == bp) |
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break; |
|
|
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num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i); |
|
|
|
force_sig_ptrace_errno_trap((int)num, (void __user *)(bkpt->trigger)); |
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} |
|
|
|
/* |
|
* Set ptrace breakpoint pointers to zero for this task. |
|
* This is required in order to prevent child processes from unregistering |
|
* breakpoints held by their parent. |
|
*/ |
|
void clear_ptrace_hw_breakpoint(struct task_struct *tsk) |
|
{ |
|
memset(tsk->thread.debug.hbp, 0, sizeof(tsk->thread.debug.hbp)); |
|
} |
|
|
|
/* |
|
* Unregister breakpoints from this task and reset the pointers in |
|
* the thread_struct. |
|
*/ |
|
void flush_ptrace_hw_breakpoint(struct task_struct *tsk) |
|
{ |
|
int i; |
|
struct thread_struct *t = &tsk->thread; |
|
|
|
for (i = 0; i < ARM_MAX_HBP_SLOTS; i++) { |
|
if (t->debug.hbp[i]) { |
|
unregister_hw_breakpoint(t->debug.hbp[i]); |
|
t->debug.hbp[i] = NULL; |
|
} |
|
} |
|
} |
|
|
|
static u32 ptrace_get_hbp_resource_info(void) |
|
{ |
|
u8 num_brps, num_wrps, debug_arch, wp_len; |
|
u32 reg = 0; |
|
|
|
num_brps = hw_breakpoint_slots(TYPE_INST); |
|
num_wrps = hw_breakpoint_slots(TYPE_DATA); |
|
debug_arch = arch_get_debug_arch(); |
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wp_len = arch_get_max_wp_len(); |
|
|
|
reg |= debug_arch; |
|
reg <<= 8; |
|
reg |= wp_len; |
|
reg <<= 8; |
|
reg |= num_wrps; |
|
reg <<= 8; |
|
reg |= num_brps; |
|
|
|
return reg; |
|
} |
|
|
|
static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type) |
|
{ |
|
struct perf_event_attr attr; |
|
|
|
ptrace_breakpoint_init(&attr); |
|
|
|
/* Initialise fields to sane defaults. */ |
|
attr.bp_addr = 0; |
|
attr.bp_len = HW_BREAKPOINT_LEN_4; |
|
attr.bp_type = type; |
|
attr.disabled = 1; |
|
|
|
return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, |
|
tsk); |
|
} |
|
|
|
static int ptrace_gethbpregs(struct task_struct *tsk, long num, |
|
unsigned long __user *data) |
|
{ |
|
u32 reg; |
|
int idx, ret = 0; |
|
struct perf_event *bp; |
|
struct arch_hw_breakpoint_ctrl arch_ctrl; |
|
|
|
if (num == 0) { |
|
reg = ptrace_get_hbp_resource_info(); |
|
} else { |
|
idx = ptrace_hbp_num_to_idx(num); |
|
if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
bp = tsk->thread.debug.hbp[idx]; |
|
if (!bp) { |
|
reg = 0; |
|
goto put; |
|
} |
|
|
|
arch_ctrl = counter_arch_bp(bp)->ctrl; |
|
|
|
/* |
|
* Fix up the len because we may have adjusted it |
|
* to compensate for an unaligned address. |
|
*/ |
|
while (!(arch_ctrl.len & 0x1)) |
|
arch_ctrl.len >>= 1; |
|
|
|
if (num & 0x1) |
|
reg = bp->attr.bp_addr; |
|
else |
|
reg = encode_ctrl_reg(arch_ctrl); |
|
} |
|
|
|
put: |
|
if (put_user(reg, data)) |
|
ret = -EFAULT; |
|
|
|
out: |
|
return ret; |
|
} |
|
|
|
static int ptrace_sethbpregs(struct task_struct *tsk, long num, |
|
unsigned long __user *data) |
|
{ |
|
int idx, gen_len, gen_type, implied_type, ret = 0; |
|
u32 user_val; |
|
struct perf_event *bp; |
|
struct arch_hw_breakpoint_ctrl ctrl; |
|
struct perf_event_attr attr; |
|
|
|
if (num == 0) |
|
goto out; |
|
else if (num < 0) |
|
implied_type = HW_BREAKPOINT_RW; |
|
else |
|
implied_type = HW_BREAKPOINT_X; |
|
|
|
idx = ptrace_hbp_num_to_idx(num); |
|
if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
if (get_user(user_val, data)) { |
|
ret = -EFAULT; |
|
goto out; |
|
} |
|
|
|
bp = tsk->thread.debug.hbp[idx]; |
|
if (!bp) { |
|
bp = ptrace_hbp_create(tsk, implied_type); |
|
if (IS_ERR(bp)) { |
|
ret = PTR_ERR(bp); |
|
goto out; |
|
} |
|
tsk->thread.debug.hbp[idx] = bp; |
|
} |
|
|
|
attr = bp->attr; |
|
|
|
if (num & 0x1) { |
|
/* Address */ |
|
attr.bp_addr = user_val; |
|
} else { |
|
/* Control */ |
|
decode_ctrl_reg(user_val, &ctrl); |
|
ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type); |
|
if (ret) |
|
goto out; |
|
|
|
if ((gen_type & implied_type) != gen_type) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
attr.bp_len = gen_len; |
|
attr.bp_type = gen_type; |
|
attr.disabled = !ctrl.enabled; |
|
} |
|
|
|
ret = modify_user_hw_breakpoint(bp, &attr); |
|
out: |
|
return ret; |
|
} |
|
#endif |
|
|
|
/* regset get/set implementations */ |
|
|
|
static int gpr_get(struct task_struct *target, |
|
const struct user_regset *regset, |
|
struct membuf to) |
|
{ |
|
return membuf_write(&to, task_pt_regs(target), sizeof(struct pt_regs)); |
|
} |
|
|
|
static int gpr_set(struct task_struct *target, |
|
const struct user_regset *regset, |
|
unsigned int pos, unsigned int count, |
|
const void *kbuf, const void __user *ubuf) |
|
{ |
|
int ret; |
|
struct pt_regs newregs = *task_pt_regs(target); |
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
|
&newregs, |
|
0, sizeof(newregs)); |
|
if (ret) |
|
return ret; |
|
|
|
if (!valid_user_regs(&newregs)) |
|
return -EINVAL; |
|
|
|
*task_pt_regs(target) = newregs; |
|
return 0; |
|
} |
|
|
|
static int fpa_get(struct task_struct *target, |
|
const struct user_regset *regset, |
|
struct membuf to) |
|
{ |
|
return membuf_write(&to, &task_thread_info(target)->fpstate, |
|
sizeof(struct user_fp)); |
|
} |
|
|
|
static int fpa_set(struct task_struct *target, |
|
const struct user_regset *regset, |
|
unsigned int pos, unsigned int count, |
|
const void *kbuf, const void __user *ubuf) |
|
{ |
|
struct thread_info *thread = task_thread_info(target); |
|
|
|
thread->used_cp[1] = thread->used_cp[2] = 1; |
|
|
|
return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
|
&thread->fpstate, |
|
0, sizeof(struct user_fp)); |
|
} |
|
|
|
#ifdef CONFIG_VFP |
|
/* |
|
* VFP register get/set implementations. |
|
* |
|
* With respect to the kernel, struct user_fp is divided into three chunks: |
|
* 16 or 32 real VFP registers (d0-d15 or d0-31) |
|
* These are transferred to/from the real registers in the task's |
|
* vfp_hard_struct. The number of registers depends on the kernel |
|
* configuration. |
|
* |
|
* 16 or 0 fake VFP registers (d16-d31 or empty) |
|
* i.e., the user_vfp structure has space for 32 registers even if |
|
* the kernel doesn't have them all. |
|
* |
|
* vfp_get() reads this chunk as zero where applicable |
|
* vfp_set() ignores this chunk |
|
* |
|
* 1 word for the FPSCR |
|
*/ |
|
static int vfp_get(struct task_struct *target, |
|
const struct user_regset *regset, |
|
struct membuf to) |
|
{ |
|
struct thread_info *thread = task_thread_info(target); |
|
struct vfp_hard_struct const *vfp = &thread->vfpstate.hard; |
|
const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); |
|
|
|
vfp_sync_hwstate(thread); |
|
|
|
membuf_write(&to, vfp->fpregs, sizeof(vfp->fpregs)); |
|
membuf_zero(&to, user_fpscr_offset - sizeof(vfp->fpregs)); |
|
return membuf_store(&to, vfp->fpscr); |
|
} |
|
|
|
/* |
|
* For vfp_set() a read-modify-write is done on the VFP registers, |
|
* in order to avoid writing back a half-modified set of registers on |
|
* failure. |
|
*/ |
|
static int vfp_set(struct task_struct *target, |
|
const struct user_regset *regset, |
|
unsigned int pos, unsigned int count, |
|
const void *kbuf, const void __user *ubuf) |
|
{ |
|
int ret; |
|
struct thread_info *thread = task_thread_info(target); |
|
struct vfp_hard_struct new_vfp; |
|
const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); |
|
const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); |
|
|
|
vfp_sync_hwstate(thread); |
|
new_vfp = thread->vfpstate.hard; |
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
|
&new_vfp.fpregs, |
|
user_fpregs_offset, |
|
user_fpregs_offset + sizeof(new_vfp.fpregs)); |
|
if (ret) |
|
return ret; |
|
|
|
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
|
user_fpregs_offset + sizeof(new_vfp.fpregs), |
|
user_fpscr_offset); |
|
if (ret) |
|
return ret; |
|
|
|
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
|
&new_vfp.fpscr, |
|
user_fpscr_offset, |
|
user_fpscr_offset + sizeof(new_vfp.fpscr)); |
|
if (ret) |
|
return ret; |
|
|
|
thread->vfpstate.hard = new_vfp; |
|
vfp_flush_hwstate(thread); |
|
|
|
return 0; |
|
} |
|
#endif /* CONFIG_VFP */ |
|
|
|
enum arm_regset { |
|
REGSET_GPR, |
|
REGSET_FPR, |
|
#ifdef CONFIG_VFP |
|
REGSET_VFP, |
|
#endif |
|
}; |
|
|
|
static const struct user_regset arm_regsets[] = { |
|
[REGSET_GPR] = { |
|
.core_note_type = NT_PRSTATUS, |
|
.n = ELF_NGREG, |
|
.size = sizeof(u32), |
|
.align = sizeof(u32), |
|
.regset_get = gpr_get, |
|
.set = gpr_set |
|
}, |
|
[REGSET_FPR] = { |
|
/* |
|
* For the FPA regs in fpstate, the real fields are a mixture |
|
* of sizes, so pretend that the registers are word-sized: |
|
*/ |
|
.core_note_type = NT_PRFPREG, |
|
.n = sizeof(struct user_fp) / sizeof(u32), |
|
.size = sizeof(u32), |
|
.align = sizeof(u32), |
|
.regset_get = fpa_get, |
|
.set = fpa_set |
|
}, |
|
#ifdef CONFIG_VFP |
|
[REGSET_VFP] = { |
|
/* |
|
* Pretend that the VFP regs are word-sized, since the FPSCR is |
|
* a single word dangling at the end of struct user_vfp: |
|
*/ |
|
.core_note_type = NT_ARM_VFP, |
|
.n = ARM_VFPREGS_SIZE / sizeof(u32), |
|
.size = sizeof(u32), |
|
.align = sizeof(u32), |
|
.regset_get = vfp_get, |
|
.set = vfp_set |
|
}, |
|
#endif /* CONFIG_VFP */ |
|
}; |
|
|
|
static const struct user_regset_view user_arm_view = { |
|
.name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, |
|
.regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets) |
|
}; |
|
|
|
const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
|
{ |
|
return &user_arm_view; |
|
} |
|
|
|
long arch_ptrace(struct task_struct *child, long request, |
|
unsigned long addr, unsigned long data) |
|
{ |
|
int ret; |
|
unsigned long __user *datap = (unsigned long __user *) data; |
|
|
|
switch (request) { |
|
case PTRACE_PEEKUSR: |
|
ret = ptrace_read_user(child, addr, datap); |
|
break; |
|
|
|
case PTRACE_POKEUSR: |
|
ret = ptrace_write_user(child, addr, data); |
|
break; |
|
|
|
case PTRACE_GETREGS: |
|
ret = copy_regset_to_user(child, |
|
&user_arm_view, REGSET_GPR, |
|
0, sizeof(struct pt_regs), |
|
datap); |
|
break; |
|
|
|
case PTRACE_SETREGS: |
|
ret = copy_regset_from_user(child, |
|
&user_arm_view, REGSET_GPR, |
|
0, sizeof(struct pt_regs), |
|
datap); |
|
break; |
|
|
|
case PTRACE_GETFPREGS: |
|
ret = copy_regset_to_user(child, |
|
&user_arm_view, REGSET_FPR, |
|
0, sizeof(union fp_state), |
|
datap); |
|
break; |
|
|
|
case PTRACE_SETFPREGS: |
|
ret = copy_regset_from_user(child, |
|
&user_arm_view, REGSET_FPR, |
|
0, sizeof(union fp_state), |
|
datap); |
|
break; |
|
|
|
#ifdef CONFIG_IWMMXT |
|
case PTRACE_GETWMMXREGS: |
|
ret = ptrace_getwmmxregs(child, datap); |
|
break; |
|
|
|
case PTRACE_SETWMMXREGS: |
|
ret = ptrace_setwmmxregs(child, datap); |
|
break; |
|
#endif |
|
|
|
case PTRACE_GET_THREAD_AREA: |
|
ret = put_user(task_thread_info(child)->tp_value[0], |
|
datap); |
|
break; |
|
|
|
case PTRACE_SET_SYSCALL: |
|
task_thread_info(child)->syscall = data; |
|
ret = 0; |
|
break; |
|
|
|
#ifdef CONFIG_CRUNCH |
|
case PTRACE_GETCRUNCHREGS: |
|
ret = ptrace_getcrunchregs(child, datap); |
|
break; |
|
|
|
case PTRACE_SETCRUNCHREGS: |
|
ret = ptrace_setcrunchregs(child, datap); |
|
break; |
|
#endif |
|
|
|
#ifdef CONFIG_VFP |
|
case PTRACE_GETVFPREGS: |
|
ret = copy_regset_to_user(child, |
|
&user_arm_view, REGSET_VFP, |
|
0, ARM_VFPREGS_SIZE, |
|
datap); |
|
break; |
|
|
|
case PTRACE_SETVFPREGS: |
|
ret = copy_regset_from_user(child, |
|
&user_arm_view, REGSET_VFP, |
|
0, ARM_VFPREGS_SIZE, |
|
datap); |
|
break; |
|
#endif |
|
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT |
|
case PTRACE_GETHBPREGS: |
|
ret = ptrace_gethbpregs(child, addr, |
|
(unsigned long __user *)data); |
|
break; |
|
case PTRACE_SETHBPREGS: |
|
ret = ptrace_sethbpregs(child, addr, |
|
(unsigned long __user *)data); |
|
break; |
|
#endif |
|
|
|
default: |
|
ret = ptrace_request(child, request, addr, data); |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
enum ptrace_syscall_dir { |
|
PTRACE_SYSCALL_ENTER = 0, |
|
PTRACE_SYSCALL_EXIT, |
|
}; |
|
|
|
static void tracehook_report_syscall(struct pt_regs *regs, |
|
enum ptrace_syscall_dir dir) |
|
{ |
|
unsigned long ip; |
|
|
|
/* |
|
* IP is used to denote syscall entry/exit: |
|
* IP = 0 -> entry, =1 -> exit |
|
*/ |
|
ip = regs->ARM_ip; |
|
regs->ARM_ip = dir; |
|
|
|
if (dir == PTRACE_SYSCALL_EXIT) |
|
tracehook_report_syscall_exit(regs, 0); |
|
else if (tracehook_report_syscall_entry(regs)) |
|
current_thread_info()->syscall = -1; |
|
|
|
regs->ARM_ip = ip; |
|
} |
|
|
|
asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno) |
|
{ |
|
current_thread_info()->syscall = scno; |
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE)) |
|
tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER); |
|
|
|
/* Do seccomp after ptrace; syscall may have changed. */ |
|
#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER |
|
if (secure_computing() == -1) |
|
return -1; |
|
#else |
|
/* XXX: remove this once OABI gets fixed */ |
|
secure_computing_strict(current_thread_info()->syscall); |
|
#endif |
|
|
|
/* Tracer or seccomp may have changed syscall. */ |
|
scno = current_thread_info()->syscall; |
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
|
trace_sys_enter(regs, scno); |
|
|
|
audit_syscall_entry(scno, regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, |
|
regs->ARM_r3); |
|
|
|
return scno; |
|
} |
|
|
|
asmlinkage void syscall_trace_exit(struct pt_regs *regs) |
|
{ |
|
/* |
|
* Audit the syscall before anything else, as a debugger may |
|
* come in and change the current registers. |
|
*/ |
|
audit_syscall_exit(regs); |
|
|
|
/* |
|
* Note that we haven't updated the ->syscall field for the |
|
* current thread. This isn't a problem because it will have |
|
* been set on syscall entry and there hasn't been an opportunity |
|
* for a PTRACE_SET_SYSCALL since then. |
|
*/ |
|
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) |
|
trace_sys_exit(regs, regs_return_value(regs)); |
|
|
|
if (test_thread_flag(TIF_SYSCALL_TRACE)) |
|
tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT); |
|
}
|
|
|