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Diffstat (limited to 'arch/avr32/kernel/ptrace.c')
-rw-r--r--arch/avr32/kernel/ptrace.c357
1 files changed, 0 insertions, 357 deletions
diff --git a/arch/avr32/kernel/ptrace.c b/arch/avr32/kernel/ptrace.c
deleted file mode 100644
index 41a14e96a1db..000000000000
--- a/arch/avr32/kernel/ptrace.c
+++ /dev/null
@@ -1,357 +0,0 @@
-/*
- * Copyright (C) 2004-2006 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#undef DEBUG
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm.h>
-#include <linux/ptrace.h>
-#include <linux/errno.h>
-#include <linux/user.h>
-#include <linux/security.h>
-#include <linux/unistd.h>
-#include <linux/notifier.h>
-
-#include <asm/traps.h>
-#include <linux/uaccess.h>
-#include <asm/ocd.h>
-#include <asm/mmu_context.h>
-#include <linux/kdebug.h>
-
-static struct pt_regs *get_user_regs(struct task_struct *tsk)
-{
- return (struct pt_regs *)((unsigned long)task_stack_page(tsk) +
- THREAD_SIZE - sizeof(struct pt_regs));
-}
-
-void user_enable_single_step(struct task_struct *tsk)
-{
- pr_debug("user_enable_single_step: pid=%u, PC=0x%08lx, SR=0x%08lx\n",
- tsk->pid, task_pt_regs(tsk)->pc, task_pt_regs(tsk)->sr);
-
- /*
- * We can't schedule in Debug mode, so when TIF_BREAKPOINT is
- * set, the system call or exception handler will do a
- * breakpoint to enter monitor mode before returning to
- * userspace.
- *
- * The monitor code will then notice that TIF_SINGLE_STEP is
- * set and return to userspace with single stepping enabled.
- * The CPU will then enter monitor mode again after exactly
- * one instruction has been executed, and the monitor code
- * will then send a SIGTRAP to the process.
- */
- set_tsk_thread_flag(tsk, TIF_BREAKPOINT);
- set_tsk_thread_flag(tsk, TIF_SINGLE_STEP);
-}
-
-void user_disable_single_step(struct task_struct *child)
-{
- /* XXX(hch): a no-op here seems wrong.. */
-}
-
-/*
- * Called by kernel/ptrace.c when detaching
- *
- * Make sure any single step bits, etc. are not set
- */
-void ptrace_disable(struct task_struct *child)
-{
- clear_tsk_thread_flag(child, TIF_SINGLE_STEP);
- clear_tsk_thread_flag(child, TIF_BREAKPOINT);
- ocd_disable(child);
-}
-
-/*
- * Read the word at offset "offset" into the task's "struct user". We
- * actually access the pt_regs struct stored on the kernel stack.
- */
-static int ptrace_read_user(struct task_struct *tsk, unsigned long offset,
- unsigned long __user *data)
-{
- unsigned long *regs;
- unsigned long value;
-
- if (offset & 3 || offset >= sizeof(struct user)) {
- printk("ptrace_read_user: invalid offset 0x%08lx\n", offset);
- return -EIO;
- }
-
- regs = (unsigned long *)get_user_regs(tsk);
-
- value = 0;
- if (offset < sizeof(struct pt_regs))
- value = regs[offset / sizeof(regs[0])];
-
- pr_debug("ptrace_read_user(%s[%u], %#lx, %p) -> %#lx\n",
- tsk->comm, tsk->pid, offset, data, value);
-
- return put_user(value, data);
-}
-
-/*
- * Write the word "value" to offset "offset" into the task's "struct
- * user". We actually access the pt_regs struct stored on the kernel
- * stack.
- */
-static int ptrace_write_user(struct task_struct *tsk, unsigned long offset,
- unsigned long value)
-{
- unsigned long *regs;
-
- pr_debug("ptrace_write_user(%s[%u], %#lx, %#lx)\n",
- tsk->comm, tsk->pid, offset, value);
-
- if (offset & 3 || offset >= sizeof(struct user)) {
- pr_debug(" invalid offset 0x%08lx\n", offset);
- return -EIO;
- }
-
- if (offset >= sizeof(struct pt_regs))
- return 0;
-
- regs = (unsigned long *)get_user_regs(tsk);
- regs[offset / sizeof(regs[0])] = value;
-
- return 0;
-}
-
-static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
-{
- struct pt_regs *regs = get_user_regs(tsk);
-
- return copy_to_user(uregs, regs, sizeof(*regs)) ? -EFAULT : 0;
-}
-
-static int ptrace_setregs(struct task_struct *tsk, const void __user *uregs)
-{
- struct pt_regs newregs;
- int ret;
-
- ret = -EFAULT;
- if (copy_from_user(&newregs, uregs, sizeof(newregs)) == 0) {
- struct pt_regs *regs = get_user_regs(tsk);
-
- ret = -EINVAL;
- if (valid_user_regs(&newregs)) {
- *regs = newregs;
- ret = 0;
- }
- }
-
- return ret;
-}
-
-long arch_ptrace(struct task_struct *child, long request,
- unsigned long addr, unsigned long data)
-{
- int ret;
- void __user *datap = (void __user *) data;
-
- switch (request) {
- /* Read the word at location addr in the child process */
- case PTRACE_PEEKTEXT:
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
- case PTRACE_PEEKUSR:
- ret = ptrace_read_user(child, addr, datap);
- break;
-
- /* Write the word in data at location addr */
- case PTRACE_POKETEXT:
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
- case PTRACE_POKEUSR:
- ret = ptrace_write_user(child, addr, data);
- break;
-
- case PTRACE_GETREGS:
- ret = ptrace_getregs(child, datap);
- break;
-
- case PTRACE_SETREGS:
- ret = ptrace_setregs(child, datap);
- break;
-
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
-
- return ret;
-}
-
-asmlinkage void syscall_trace(void)
-{
- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- return;
- if (!(current->ptrace & PT_PTRACED))
- return;
-
- /* 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) {
- pr_debug("syscall_trace: sending signal %d to PID %u\n",
- current->exit_code, current->pid);
- send_sig(current->exit_code, current, 1);
- current->exit_code = 0;
- }
-}
-
-/*
- * debug_trampoline() is an assembly stub which will store all user
- * registers on the stack and execute a breakpoint instruction.
- *
- * If we single-step into an exception handler which runs with
- * interrupts disabled the whole time so it doesn't have to check for
- * pending work, its return address will be modified so that it ends
- * up returning to debug_trampoline.
- *
- * If the exception handler decides to store the user context and
- * enable interrupts after all, it will restore the original return
- * address and status register value. Before it returns, it will
- * notice that TIF_BREAKPOINT is set and execute a breakpoint
- * instruction.
- */
-extern void debug_trampoline(void);
-
-asmlinkage struct pt_regs *do_debug(struct pt_regs *regs)
-{
- struct thread_info *ti;
- unsigned long trampoline_addr;
- u32 status;
- u32 ctrl;
- int code;
-
- status = ocd_read(DS);
- ti = current_thread_info();
- code = TRAP_BRKPT;
-
- pr_debug("do_debug: status=0x%08x PC=0x%08lx SR=0x%08lx tif=0x%08lx\n",
- status, regs->pc, regs->sr, ti->flags);
-
- if (!user_mode(regs)) {
- unsigned long die_val = DIE_BREAKPOINT;
-
- if (status & (1 << OCD_DS_SSS_BIT))
- die_val = DIE_SSTEP;
-
- if (notify_die(die_val, "ptrace", regs, 0, 0, SIGTRAP)
- == NOTIFY_STOP)
- return regs;
-
- if ((status & (1 << OCD_DS_SWB_BIT))
- && test_and_clear_ti_thread_flag(
- ti, TIF_BREAKPOINT)) {
- /*
- * Explicit breakpoint from trampoline or
- * exception/syscall/interrupt handler.
- *
- * The real saved regs are on the stack right
- * after the ones we saved on entry.
- */
- regs++;
- pr_debug(" -> TIF_BREAKPOINT done, adjusted regs:"
- "PC=0x%08lx SR=0x%08lx\n",
- regs->pc, regs->sr);
- BUG_ON(!user_mode(regs));
-
- if (test_thread_flag(TIF_SINGLE_STEP)) {
- pr_debug("Going to do single step...\n");
- return regs;
- }
-
- /*
- * No TIF_SINGLE_STEP means we're done
- * stepping over a syscall. Do the trap now.
- */
- code = TRAP_TRACE;
- } else if ((status & (1 << OCD_DS_SSS_BIT))
- && test_ti_thread_flag(ti, TIF_SINGLE_STEP)) {
-
- pr_debug("Stepped into something, "
- "setting TIF_BREAKPOINT...\n");
- set_ti_thread_flag(ti, TIF_BREAKPOINT);
-
- /*
- * We stepped into an exception, interrupt or
- * syscall handler. Some exception handlers
- * don't check for pending work, so we need to
- * set up a trampoline just in case.
- *
- * The exception entry code will undo the
- * trampoline stuff if it does a full context
- * save (which also means that it'll check for
- * pending work later.)
- */
- if ((regs->sr & MODE_MASK) == MODE_EXCEPTION) {
- trampoline_addr
- = (unsigned long)&debug_trampoline;
-
- pr_debug("Setting up trampoline...\n");
- ti->rar_saved = sysreg_read(RAR_EX);
- ti->rsr_saved = sysreg_read(RSR_EX);
- sysreg_write(RAR_EX, trampoline_addr);
- sysreg_write(RSR_EX, (MODE_EXCEPTION
- | SR_EM | SR_GM));
- BUG_ON(ti->rsr_saved & MODE_MASK);
- }
-
- /*
- * If we stepped into a system call, we
- * shouldn't do a single step after we return
- * since the return address is right after the
- * "scall" instruction we were told to step
- * over.
- */
- if ((regs->sr & MODE_MASK) == MODE_SUPERVISOR) {
- pr_debug("Supervisor; no single step\n");
- clear_ti_thread_flag(ti, TIF_SINGLE_STEP);
- }
-
- ctrl = ocd_read(DC);
- ctrl &= ~(1 << OCD_DC_SS_BIT);
- ocd_write(DC, ctrl);
-
- return regs;
- } else {
- printk(KERN_ERR "Unexpected OCD_DS value: 0x%08x\n",
- status);
- printk(KERN_ERR "Thread flags: 0x%08lx\n", ti->flags);
- die("Unhandled debug trap in kernel mode",
- regs, SIGTRAP);
- }
- } else if (status & (1 << OCD_DS_SSS_BIT)) {
- /* Single step in user mode */
- code = TRAP_TRACE;
-
- ctrl = ocd_read(DC);
- ctrl &= ~(1 << OCD_DC_SS_BIT);
- ocd_write(DC, ctrl);
- }
-
- pr_debug("Sending SIGTRAP: code=%d PC=0x%08lx SR=0x%08lx\n",
- code, regs->pc, regs->sr);
-
- clear_thread_flag(TIF_SINGLE_STEP);
- _exception(SIGTRAP, regs, code, instruction_pointer(regs));
-
- return regs;
-}
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