2005-04-17 06:20:36 +08:00
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/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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2005-05-01 23:59:14 +08:00
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#include <linux/signal.h>
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2008-09-06 18:35:55 +08:00
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#include <linux/uaccess.h>
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2010-09-03 17:42:55 +08:00
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#include <linux/perf_event.h>
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#include <linux/hw_breakpoint.h>
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2005-04-17 06:20:36 +08:00
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/traps.h>
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#include "ptrace.h"
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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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#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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2010-06-25 19:24:53 +08:00
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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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#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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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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* 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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* 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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* 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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* 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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2005-04-17 06:20:36 +08:00
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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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2006-01-12 17:05:57 +08:00
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return task_pt_regs(task)->uregs[offset];
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2005-04-17 06:20:36 +08:00
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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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2006-01-12 17:05:57 +08:00
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struct pt_regs newregs, *regs = task_pt_regs(task);
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2005-04-17 06:20:36 +08:00
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int ret = -EINVAL;
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newregs = *regs;
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newregs.uregs[offset] = data;
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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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return ret;
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}
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static inline int
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read_u32(struct task_struct *task, unsigned long addr, u32 *res)
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{
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int ret;
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ret = access_process_vm(task, addr, res, sizeof(*res), 0);
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return ret == sizeof(*res) ? 0 : -EIO;
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}
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static inline int
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read_instr(struct task_struct *task, unsigned long addr, u32 *res)
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{
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int ret;
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if (addr & 1) {
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u16 val;
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ret = access_process_vm(task, addr & ~1, &val, sizeof(val), 0);
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ret = ret == sizeof(val) ? 0 : -EIO;
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*res = val;
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} else {
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u32 val;
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ret = access_process_vm(task, addr & ~3, &val, sizeof(val), 0);
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ret = ret == sizeof(val) ? 0 : -EIO;
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*res = val;
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}
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return ret;
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}
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/*
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* Get value of register `rn' (in the instruction)
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*/
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static unsigned long
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ptrace_getrn(struct task_struct *child, unsigned long insn)
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{
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unsigned int reg = (insn >> 16) & 15;
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unsigned long val;
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val = get_user_reg(child, reg);
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if (reg == 15)
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2008-09-06 17:14:24 +08:00
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val += 8;
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2005-04-17 06:20:36 +08:00
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return val;
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}
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/*
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* Get value of operand 2 (in an ALU instruction)
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*/
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static unsigned long
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ptrace_getaluop2(struct task_struct *child, unsigned long insn)
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{
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unsigned long val;
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int shift;
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int type;
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if (insn & 1 << 25) {
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val = insn & 255;
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shift = (insn >> 8) & 15;
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type = 3;
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} else {
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val = get_user_reg (child, insn & 15);
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if (insn & (1 << 4))
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shift = (int)get_user_reg (child, (insn >> 8) & 15);
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else
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shift = (insn >> 7) & 31;
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type = (insn >> 5) & 3;
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}
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switch (type) {
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case 0: val <<= shift; break;
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case 1: val >>= shift; break;
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case 2:
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val = (((signed long)val) >> shift);
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break;
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case 3:
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val = (val >> shift) | (val << (32 - shift));
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break;
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}
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return val;
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}
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/*
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* Get value of operand 2 (in a LDR instruction)
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*/
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static unsigned long
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ptrace_getldrop2(struct task_struct *child, unsigned long insn)
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{
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unsigned long val;
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int shift;
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int type;
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val = get_user_reg(child, insn & 15);
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shift = (insn >> 7) & 31;
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type = (insn >> 5) & 3;
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switch (type) {
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case 0: val <<= shift; break;
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case 1: val >>= shift; break;
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case 2:
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val = (((signed long)val) >> shift);
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break;
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case 3:
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val = (val >> shift) | (val << (32 - shift));
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break;
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}
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return val;
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}
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#define OP_MASK 0x01e00000
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#define OP_AND 0x00000000
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#define OP_EOR 0x00200000
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#define OP_SUB 0x00400000
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#define OP_RSB 0x00600000
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#define OP_ADD 0x00800000
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#define OP_ADC 0x00a00000
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#define OP_SBC 0x00c00000
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#define OP_RSC 0x00e00000
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#define OP_ORR 0x01800000
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#define OP_MOV 0x01a00000
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#define OP_BIC 0x01c00000
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#define OP_MVN 0x01e00000
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static unsigned long
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get_branch_address(struct task_struct *child, unsigned long pc, unsigned long insn)
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{
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u32 alt = 0;
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switch (insn & 0x0e000000) {
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case 0x00000000:
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case 0x02000000: {
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/*
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* data processing
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*/
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long aluop1, aluop2, ccbit;
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2005-12-10 19:59:15 +08:00
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if ((insn & 0x0fffffd0) == 0x012fff10) {
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/*
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* bx or blx
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*/
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alt = get_user_reg(child, insn & 15);
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break;
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}
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2005-04-17 06:20:36 +08:00
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if ((insn & 0xf000) != 0xf000)
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break;
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aluop1 = ptrace_getrn(child, insn);
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aluop2 = ptrace_getaluop2(child, insn);
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ccbit = get_user_reg(child, REG_PSR) & PSR_C_BIT ? 1 : 0;
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switch (insn & OP_MASK) {
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case OP_AND: alt = aluop1 & aluop2; break;
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case OP_EOR: alt = aluop1 ^ aluop2; break;
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case OP_SUB: alt = aluop1 - aluop2; break;
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case OP_RSB: alt = aluop2 - aluop1; break;
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case OP_ADD: alt = aluop1 + aluop2; break;
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case OP_ADC: alt = aluop1 + aluop2 + ccbit; break;
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case OP_SBC: alt = aluop1 - aluop2 + ccbit; break;
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case OP_RSC: alt = aluop2 - aluop1 + ccbit; break;
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case OP_ORR: alt = aluop1 | aluop2; break;
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case OP_MOV: alt = aluop2; break;
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case OP_BIC: alt = aluop1 & ~aluop2; break;
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case OP_MVN: alt = ~aluop2; break;
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}
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break;
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}
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case 0x04000000:
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case 0x06000000:
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/*
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* ldr
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*/
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if ((insn & 0x0010f000) == 0x0010f000) {
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unsigned long base;
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base = ptrace_getrn(child, insn);
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if (insn & 1 << 24) {
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long aluop2;
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if (insn & 0x02000000)
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aluop2 = ptrace_getldrop2(child, insn);
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else
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aluop2 = insn & 0xfff;
|
|
|
|
|
|
|
|
if (insn & 1 << 23)
|
|
|
|
base += aluop2;
|
|
|
|
else
|
|
|
|
base -= aluop2;
|
|
|
|
}
|
2008-09-06 17:14:24 +08:00
|
|
|
read_u32(child, base, &alt);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 0x08000000:
|
|
|
|
/*
|
|
|
|
* ldm
|
|
|
|
*/
|
|
|
|
if ((insn & 0x00108000) == 0x00108000) {
|
|
|
|
unsigned long base;
|
|
|
|
unsigned int nr_regs;
|
|
|
|
|
|
|
|
if (insn & (1 << 23)) {
|
|
|
|
nr_regs = hweight16(insn & 65535) << 2;
|
|
|
|
|
|
|
|
if (!(insn & (1 << 24)))
|
|
|
|
nr_regs -= 4;
|
|
|
|
} else {
|
|
|
|
if (insn & (1 << 24))
|
|
|
|
nr_regs = -4;
|
|
|
|
else
|
|
|
|
nr_regs = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
base = ptrace_getrn(child, insn);
|
|
|
|
|
2008-09-06 17:14:24 +08:00
|
|
|
read_u32(child, base + nr_regs, &alt);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
|
|
|
case 0x0a000000: {
|
|
|
|
/*
|
|
|
|
* bl or b
|
|
|
|
*/
|
|
|
|
signed long displ;
|
|
|
|
/* It's a branch/branch link: instead of trying to
|
|
|
|
* figure out whether the branch will be taken or not,
|
|
|
|
* we'll put a breakpoint at both locations. This is
|
|
|
|
* simpler, more reliable, and probably not a whole lot
|
|
|
|
* slower than the alternative approach of emulating the
|
|
|
|
* branch.
|
|
|
|
*/
|
|
|
|
displ = (insn & 0x00ffffff) << 8;
|
|
|
|
displ = (displ >> 6) + 8;
|
|
|
|
if (displ != 0 && displ != 4)
|
|
|
|
alt = pc + displ;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return alt;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
swap_insn(struct task_struct *task, unsigned long addr,
|
|
|
|
void *old_insn, void *new_insn, int size)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = access_process_vm(task, addr, old_insn, size, 0);
|
|
|
|
if (ret == size)
|
|
|
|
ret = access_process_vm(task, addr, new_insn, size, 1);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
add_breakpoint(struct task_struct *task, struct debug_info *dbg, unsigned long addr)
|
|
|
|
{
|
|
|
|
int nr = dbg->nsaved;
|
|
|
|
|
|
|
|
if (nr < 2) {
|
|
|
|
u32 new_insn = BREAKINST_ARM;
|
|
|
|
int res;
|
|
|
|
|
|
|
|
res = swap_insn(task, addr, &dbg->bp[nr].insn, &new_insn, 4);
|
|
|
|
|
|
|
|
if (res == 4) {
|
|
|
|
dbg->bp[nr].address = addr;
|
|
|
|
dbg->nsaved += 1;
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
printk(KERN_ERR "ptrace: too many breakpoints\n");
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Clear one breakpoint in the user program. We copy what the hardware
|
|
|
|
* does and use bit 0 of the address to indicate whether this is a Thumb
|
|
|
|
* breakpoint or an ARM breakpoint.
|
|
|
|
*/
|
|
|
|
static void clear_breakpoint(struct task_struct *task, struct debug_entry *bp)
|
|
|
|
{
|
|
|
|
unsigned long addr = bp->address;
|
|
|
|
union debug_insn old_insn;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (addr & 1) {
|
|
|
|
ret = swap_insn(task, addr & ~1, &old_insn.thumb,
|
|
|
|
&bp->insn.thumb, 2);
|
|
|
|
|
|
|
|
if (ret != 2 || old_insn.thumb != BREAKINST_THUMB)
|
|
|
|
printk(KERN_ERR "%s:%d: corrupted Thumb breakpoint at "
|
2007-10-19 14:40:41 +08:00
|
|
|
"0x%08lx (0x%04x)\n", task->comm,
|
|
|
|
task_pid_nr(task), addr, old_insn.thumb);
|
2005-04-17 06:20:36 +08:00
|
|
|
} else {
|
|
|
|
ret = swap_insn(task, addr & ~3, &old_insn.arm,
|
|
|
|
&bp->insn.arm, 4);
|
|
|
|
|
|
|
|
if (ret != 4 || old_insn.arm != BREAKINST_ARM)
|
|
|
|
printk(KERN_ERR "%s:%d: corrupted ARM breakpoint at "
|
2007-10-19 14:40:41 +08:00
|
|
|
"0x%08lx (0x%08x)\n", task->comm,
|
|
|
|
task_pid_nr(task), addr, old_insn.arm);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void ptrace_set_bpt(struct task_struct *child)
|
|
|
|
{
|
|
|
|
struct pt_regs *regs;
|
|
|
|
unsigned long pc;
|
|
|
|
u32 insn;
|
|
|
|
int res;
|
|
|
|
|
2006-01-12 17:05:57 +08:00
|
|
|
regs = task_pt_regs(child);
|
2005-04-17 06:20:36 +08:00
|
|
|
pc = instruction_pointer(regs);
|
|
|
|
|
|
|
|
if (thumb_mode(regs)) {
|
|
|
|
printk(KERN_WARNING "ptrace: can't handle thumb mode\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
res = read_instr(child, pc, &insn);
|
|
|
|
if (!res) {
|
|
|
|
struct debug_info *dbg = &child->thread.debug;
|
|
|
|
unsigned long alt;
|
|
|
|
|
|
|
|
dbg->nsaved = 0;
|
|
|
|
|
|
|
|
alt = get_branch_address(child, pc, insn);
|
|
|
|
if (alt)
|
|
|
|
add_breakpoint(child, dbg, alt);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Note that we ignore the result of setting the above
|
|
|
|
* breakpoint since it may fail. When it does, this is
|
|
|
|
* not so much an error, but a forewarning that we may
|
|
|
|
* be receiving a prefetch abort shortly.
|
|
|
|
*
|
|
|
|
* If we don't set this breakpoint here, then we can
|
|
|
|
* lose control of the thread during single stepping.
|
|
|
|
*/
|
|
|
|
if (!alt || predicate(insn) != PREDICATE_ALWAYS)
|
|
|
|
add_breakpoint(child, dbg, pc + 4);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Ensure no single-step breakpoint is pending. Returns non-zero
|
|
|
|
* value if child was being single-stepped.
|
|
|
|
*/
|
|
|
|
void ptrace_cancel_bpt(struct task_struct *child)
|
|
|
|
{
|
|
|
|
int i, nsaved = child->thread.debug.nsaved;
|
|
|
|
|
|
|
|
child->thread.debug.nsaved = 0;
|
|
|
|
|
|
|
|
if (nsaved > 2) {
|
|
|
|
printk("ptrace_cancel_bpt: bogus nsaved: %d!\n", nsaved);
|
|
|
|
nsaved = 2;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < nsaved; i++)
|
|
|
|
clear_breakpoint(child, &child->thread.debug.bp[i]);
|
|
|
|
}
|
|
|
|
|
2010-03-11 07:22:50 +08:00
|
|
|
void user_disable_single_step(struct task_struct *task)
|
|
|
|
{
|
|
|
|
task->ptrace &= ~PT_SINGLESTEP;
|
|
|
|
ptrace_cancel_bpt(task);
|
|
|
|
}
|
|
|
|
|
|
|
|
void user_enable_single_step(struct task_struct *task)
|
|
|
|
{
|
|
|
|
task->ptrace |= PT_SINGLESTEP;
|
|
|
|
}
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Called by kernel/ptrace.c when detaching..
|
|
|
|
*/
|
|
|
|
void ptrace_disable(struct task_struct *child)
|
|
|
|
{
|
2010-03-11 07:22:50 +08:00
|
|
|
user_disable_single_step(child);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle hitting a breakpoint.
|
|
|
|
*/
|
|
|
|
void ptrace_break(struct task_struct *tsk, struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
siginfo_t info;
|
|
|
|
|
|
|
|
ptrace_cancel_bpt(tsk);
|
|
|
|
|
|
|
|
info.si_signo = SIGTRAP;
|
|
|
|
info.si_errno = 0;
|
|
|
|
info.si_code = TRAP_BRKPT;
|
|
|
|
info.si_addr = (void __user *)instruction_pointer(regs);
|
|
|
|
|
|
|
|
force_sig_info(SIGTRAP, &info, tsk);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int break_trap(struct pt_regs *regs, unsigned int instr)
|
|
|
|
{
|
|
|
|
ptrace_break(current, regs);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct undef_hook arm_break_hook = {
|
|
|
|
.instr_mask = 0x0fffffff,
|
|
|
|
.instr_val = 0x07f001f0,
|
|
|
|
.cpsr_mask = PSR_T_BIT,
|
|
|
|
.cpsr_val = 0,
|
|
|
|
.fn = break_trap,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct undef_hook thumb_break_hook = {
|
|
|
|
.instr_mask = 0xffff,
|
|
|
|
.instr_val = 0xde01,
|
|
|
|
.cpsr_mask = PSR_T_BIT,
|
|
|
|
.cpsr_val = PSR_T_BIT,
|
|
|
|
.fn = break_trap,
|
|
|
|
};
|
|
|
|
|
2010-02-03 01:22:16 +08:00
|
|
|
static int thumb2_break_trap(struct pt_regs *regs, unsigned int instr)
|
|
|
|
{
|
|
|
|
unsigned int instr2;
|
|
|
|
void __user *pc;
|
|
|
|
|
|
|
|
/* Check the second half of the instruction. */
|
|
|
|
pc = (void __user *)(instruction_pointer(regs) + 2);
|
|
|
|
|
|
|
|
if (processor_mode(regs) == SVC_MODE) {
|
|
|
|
instr2 = *(u16 *) pc;
|
|
|
|
} else {
|
|
|
|
get_user(instr2, (u16 __user *)pc);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (instr2 == 0xa000) {
|
|
|
|
ptrace_break(current, regs);
|
|
|
|
return 0;
|
|
|
|
} else {
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct undef_hook thumb2_break_hook = {
|
|
|
|
.instr_mask = 0xffff,
|
|
|
|
.instr_val = 0xf7f0,
|
|
|
|
.cpsr_mask = PSR_T_BIT,
|
|
|
|
.cpsr_val = PSR_T_BIT,
|
|
|
|
.fn = thumb2_break_trap,
|
|
|
|
};
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
static int __init ptrace_break_init(void)
|
|
|
|
{
|
|
|
|
register_undef_hook(&arm_break_hook);
|
|
|
|
register_undef_hook(&thumb_break_hook);
|
2010-02-03 01:22:16 +08:00
|
|
|
register_undef_hook(&thumb2_break_hook);
|
2005-04-17 06:20:36 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
core_initcall(ptrace_break_init);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Read the word at offset "off" into the "struct user". We
|
|
|
|
* actually access the pt_regs stored on the kernel stack.
|
|
|
|
*/
|
|
|
|
static int ptrace_read_user(struct task_struct *tsk, unsigned long off,
|
|
|
|
unsigned long __user *ret)
|
|
|
|
{
|
|
|
|
unsigned long tmp;
|
|
|
|
|
|
|
|
if (off & 3 || off >= sizeof(struct user))
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
tmp = 0;
|
2009-07-24 19:34:58 +08:00
|
|
|
if (off == PT_TEXT_ADDR)
|
|
|
|
tmp = tsk->mm->start_code;
|
|
|
|
else if (off == PT_DATA_ADDR)
|
|
|
|
tmp = tsk->mm->start_data;
|
|
|
|
else if (off == PT_TEXT_END_ADDR)
|
|
|
|
tmp = tsk->mm->end_code;
|
|
|
|
else if (off < sizeof(struct pt_regs))
|
2005-04-17 06:20:36 +08:00
|
|
|
tmp = get_user_reg(tsk, off >> 2);
|
|
|
|
|
|
|
|
return put_user(tmp, ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Write the word at offset "off" into "struct user". We
|
|
|
|
* actually access the pt_regs stored on the kernel stack.
|
|
|
|
*/
|
|
|
|
static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
|
|
|
|
unsigned long val)
|
|
|
|
{
|
|
|
|
if (off & 3 || off >= sizeof(struct user))
|
|
|
|
return -EIO;
|
|
|
|
|
|
|
|
if (off >= sizeof(struct pt_regs))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return put_user_reg(tsk, off >> 2, val);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get all user integer registers.
|
|
|
|
*/
|
|
|
|
static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
|
|
|
|
{
|
2006-01-12 17:05:57 +08:00
|
|
|
struct pt_regs *regs = task_pt_regs(tsk);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set all user integer registers.
|
|
|
|
*/
|
|
|
|
static int ptrace_setregs(struct task_struct *tsk, void __user *uregs)
|
|
|
|
{
|
|
|
|
struct pt_regs newregs;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = -EFAULT;
|
|
|
|
if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
|
2006-01-12 17:05:57 +08:00
|
|
|
struct pt_regs *regs = task_pt_regs(tsk);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
ret = -EINVAL;
|
|
|
|
if (valid_user_regs(&newregs)) {
|
|
|
|
*regs = newregs;
|
|
|
|
ret = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get the child FPU state.
|
|
|
|
*/
|
|
|
|
static int ptrace_getfpregs(struct task_struct *tsk, void __user *ufp)
|
|
|
|
{
|
2006-01-12 17:05:56 +08:00
|
|
|
return copy_to_user(ufp, &task_thread_info(tsk)->fpstate,
|
2005-04-17 06:20:36 +08:00
|
|
|
sizeof(struct user_fp)) ? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the child FPU state.
|
|
|
|
*/
|
|
|
|
static int ptrace_setfpregs(struct task_struct *tsk, void __user *ufp)
|
|
|
|
{
|
2006-01-12 17:05:56 +08:00
|
|
|
struct thread_info *thread = task_thread_info(tsk);
|
2005-04-17 06:20:36 +08:00
|
|
|
thread->used_cp[1] = thread->used_cp[2] = 1;
|
|
|
|
return copy_from_user(&thread->fpstate, ufp,
|
|
|
|
sizeof(struct user_fp)) ? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_IWMMXT
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get the child iWMMXt state.
|
|
|
|
*/
|
|
|
|
static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp)
|
|
|
|
{
|
2006-01-12 17:05:56 +08:00
|
|
|
struct thread_info *thread = task_thread_info(tsk);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
|
|
|
|
return -ENODATA;
|
|
|
|
iwmmxt_task_disable(thread); /* force it to ram */
|
2006-03-13 06:36:06 +08:00
|
|
|
return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE)
|
|
|
|
? -EFAULT : 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the child iWMMXt state.
|
|
|
|
*/
|
|
|
|
static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp)
|
|
|
|
{
|
2006-01-12 17:05:56 +08:00
|
|
|
struct thread_info *thread = task_thread_info(tsk);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT))
|
|
|
|
return -EACCES;
|
|
|
|
iwmmxt_task_release(thread); /* force a reload */
|
2006-03-15 22:57:13 +08:00
|
|
|
return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE)
|
2006-03-13 06:36:06 +08:00
|
|
|
? -EFAULT : 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
2006-06-28 05:56:19 +08:00
|
|
|
#ifdef CONFIG_CRUNCH
|
|
|
|
/*
|
|
|
|
* Get the child Crunch state.
|
|
|
|
*/
|
|
|
|
static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = task_thread_info(tsk);
|
|
|
|
|
|
|
|
crunch_task_disable(thread); /* force it to ram */
|
|
|
|
return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE)
|
|
|
|
? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the child Crunch state.
|
|
|
|
*/
|
|
|
|
static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = task_thread_info(tsk);
|
|
|
|
|
|
|
|
crunch_task_release(thread); /* force a reload */
|
|
|
|
return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE)
|
|
|
|
? -EFAULT : 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2009-02-11 20:12:56 +08:00
|
|
|
#ifdef CONFIG_VFP
|
|
|
|
/*
|
|
|
|
* Get the child VFP state.
|
|
|
|
*/
|
|
|
|
static int ptrace_getvfpregs(struct task_struct *tsk, void __user *data)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = task_thread_info(tsk);
|
|
|
|
union vfp_state *vfp = &thread->vfpstate;
|
|
|
|
struct user_vfp __user *ufp = data;
|
|
|
|
|
2010-02-06 19:36:23 +08:00
|
|
|
vfp_sync_hwstate(thread);
|
2009-02-11 20:12:56 +08:00
|
|
|
|
|
|
|
/* copy the floating point registers */
|
|
|
|
if (copy_to_user(&ufp->fpregs, &vfp->hard.fpregs,
|
|
|
|
sizeof(vfp->hard.fpregs)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
/* copy the status and control register */
|
|
|
|
if (put_user(vfp->hard.fpscr, &ufp->fpscr))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the child VFP state.
|
|
|
|
*/
|
|
|
|
static int ptrace_setvfpregs(struct task_struct *tsk, void __user *data)
|
|
|
|
{
|
|
|
|
struct thread_info *thread = task_thread_info(tsk);
|
|
|
|
union vfp_state *vfp = &thread->vfpstate;
|
|
|
|
struct user_vfp __user *ufp = data;
|
|
|
|
|
2010-02-06 19:36:23 +08:00
|
|
|
vfp_sync_hwstate(thread);
|
2009-02-11 20:12:56 +08:00
|
|
|
|
|
|
|
/* copy the floating point registers */
|
|
|
|
if (copy_from_user(&vfp->hard.fpregs, &ufp->fpregs,
|
|
|
|
sizeof(vfp->hard.fpregs)))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
/* copy the status and control register */
|
|
|
|
if (get_user(vfp->hard.fpscr, &ufp->fpscr))
|
|
|
|
return -EFAULT;
|
|
|
|
|
2010-02-06 19:36:23 +08:00
|
|
|
vfp_flush_hwstate(thread);
|
|
|
|
|
2009-02-11 20:12:56 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2010-09-03 17:42:55 +08:00
|
|
|
#ifdef CONFIG_HAVE_HW_BREAKPOINT
|
|
|
|
/*
|
|
|
|
* Convert a virtual register number into an index for a thread_info
|
|
|
|
* breakpoint array. Breakpoints are identified using positive numbers
|
|
|
|
* whilst watchpoints are negative. The registers are laid out as pairs
|
|
|
|
* of (address, control), each pair mapping to a unique hw_breakpoint struct.
|
|
|
|
* Register 0 is reserved for describing resource information.
|
|
|
|
*/
|
|
|
|
static int ptrace_hbp_num_to_idx(long num)
|
|
|
|
{
|
|
|
|
if (num < 0)
|
|
|
|
num = (ARM_MAX_BRP << 1) - num;
|
|
|
|
return (num - 1) >> 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Returns the virtual register number for the address of the
|
|
|
|
* breakpoint at index idx.
|
|
|
|
*/
|
|
|
|
static long ptrace_hbp_idx_to_num(int idx)
|
|
|
|
{
|
|
|
|
long mid = ARM_MAX_BRP << 1;
|
|
|
|
long num = (idx << 1) + 1;
|
|
|
|
return num > mid ? mid - num : num;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Handle hitting a HW-breakpoint.
|
|
|
|
*/
|
|
|
|
static void ptrace_hbptriggered(struct perf_event *bp, int unused,
|
|
|
|
struct perf_sample_data *data,
|
|
|
|
struct pt_regs *regs)
|
|
|
|
{
|
|
|
|
struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp);
|
|
|
|
long num;
|
|
|
|
int i;
|
|
|
|
siginfo_t info;
|
|
|
|
|
|
|
|
for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i)
|
|
|
|
if (current->thread.debug.hbp[i] == bp)
|
|
|
|
break;
|
|
|
|
|
|
|
|
num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i);
|
|
|
|
|
|
|
|
info.si_signo = SIGTRAP;
|
|
|
|
info.si_errno = (int)num;
|
|
|
|
info.si_code = TRAP_HWBKPT;
|
|
|
|
info.si_addr = (void __user *)(bkpt->trigger);
|
|
|
|
|
|
|
|
force_sig_info(SIGTRAP, &info, current);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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();
|
|
|
|
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, 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 (idx & 0x1)
|
|
|
|
reg = encode_ctrl_reg(arch_ctrl);
|
|
|
|
else
|
|
|
|
reg = bp->attr.bp_addr;
|
|
|
|
}
|
|
|
|
|
|
|
|
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
|
|
|
|
|
2010-10-28 06:33:47 +08:00
|
|
|
long arch_ptrace(struct task_struct *child, long request,
|
|
|
|
unsigned long addr, unsigned long data)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
int ret;
|
2010-10-28 06:33:48 +08:00
|
|
|
unsigned long __user *datap = (unsigned long __user *) data;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
switch (request) {
|
|
|
|
case PTRACE_PEEKUSR:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_read_user(child, addr, datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_POKEUSR:
|
|
|
|
ret = ptrace_write_user(child, addr, data);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_GETREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_getregs(child, datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_SETREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_setregs(child, datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_GETFPREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_getfpregs(child, datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_SETFPREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_setfpregs(child, datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
#ifdef CONFIG_IWMMXT
|
|
|
|
case PTRACE_GETWMMXREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_getwmmxregs(child, datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_SETWMMXREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_setwmmxregs(child, datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
|
|
|
case PTRACE_GET_THREAD_AREA:
|
2006-01-12 17:05:56 +08:00
|
|
|
ret = put_user(task_thread_info(child)->tp_value,
|
2010-10-28 06:33:48 +08:00
|
|
|
datap);
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
|
2006-01-15 03:30:04 +08:00
|
|
|
case PTRACE_SET_SYSCALL:
|
2007-05-06 20:56:26 +08:00
|
|
|
task_thread_info(child)->syscall = data;
|
2006-01-15 03:30:04 +08:00
|
|
|
ret = 0;
|
|
|
|
break;
|
|
|
|
|
2006-06-28 05:56:19 +08:00
|
|
|
#ifdef CONFIG_CRUNCH
|
|
|
|
case PTRACE_GETCRUNCHREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_getcrunchregs(child, datap);
|
2006-06-28 05:56:19 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_SETCRUNCHREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_setcrunchregs(child, datap);
|
2006-06-28 05:56:19 +08:00
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
2009-02-11 20:12:56 +08:00
|
|
|
#ifdef CONFIG_VFP
|
|
|
|
case PTRACE_GETVFPREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_getvfpregs(child, datap);
|
2009-02-11 20:12:56 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case PTRACE_SETVFPREGS:
|
2010-10-28 06:33:48 +08:00
|
|
|
ret = ptrace_setvfpregs(child, datap);
|
2009-02-11 20:12:56 +08:00
|
|
|
break;
|
|
|
|
#endif
|
|
|
|
|
2010-09-03 17:42:55 +08:00
|
|
|
#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
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
default:
|
|
|
|
ret = ptrace_request(child, request, addr, data);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2006-01-15 03:30:04 +08:00
|
|
|
asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
unsigned long ip;
|
|
|
|
|
|
|
|
if (!test_thread_flag(TIF_SYSCALL_TRACE))
|
2006-01-15 03:30:04 +08:00
|
|
|
return scno;
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!(current->ptrace & PT_PTRACED))
|
2006-01-15 03:30:04 +08:00
|
|
|
return scno;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Save IP. IP is used to denote syscall entry/exit:
|
|
|
|
* IP = 0 -> entry, = 1 -> exit
|
|
|
|
*/
|
|
|
|
ip = regs->ARM_ip;
|
|
|
|
regs->ARM_ip = why;
|
|
|
|
|
2007-05-06 20:56:26 +08:00
|
|
|
current_thread_info()->syscall = scno;
|
2006-01-15 03:30:04 +08:00
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
/* the 0x80 provides a way for the tracing parent to distinguish
|
|
|
|
between a syscall stop and SIGTRAP delivery */
|
|
|
|
ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
|
|
|
|
? 0x80 : 0));
|
|
|
|
/*
|
|
|
|
* this isn't the same as continuing with a signal, but it will do
|
|
|
|
* for normal use. strace only continues with a signal if the
|
|
|
|
* stopping signal is not SIGTRAP. -brl
|
|
|
|
*/
|
|
|
|
if (current->exit_code) {
|
|
|
|
send_sig(current->exit_code, current, 1);
|
|
|
|
current->exit_code = 0;
|
|
|
|
}
|
|
|
|
regs->ARM_ip = ip;
|
2006-01-15 03:30:04 +08:00
|
|
|
|
2007-05-06 20:56:26 +08:00
|
|
|
return current_thread_info()->syscall;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|