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authorPaul Mundt <lethal@linux-sh.org>2007-11-10 19:53:31 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 13:18:42 +0900
commit48b22cf993cbc8f62c9b4025cfe0cfccd800181a (patch)
treea84a12b2b58523a6ac52ef2a0b6f0dd3988ac656 /arch/sh64/kernel/ptrace.c
parenta62a3861e0adfd2612372883b5b1fc05a5182796 (diff)
downloadlinux-linaro-stable-48b22cf993cbc8f62c9b4025cfe0cfccd800181a.tar.gz
sh: Move in the SH-5 ptrace impl.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh64/kernel/ptrace.c')
-rw-r--r--arch/sh64/kernel/ptrace.c332
1 files changed, 0 insertions, 332 deletions
diff --git a/arch/sh64/kernel/ptrace.c b/arch/sh64/kernel/ptrace.c
deleted file mode 100644
index 8a2d339cf760..000000000000
--- a/arch/sh64/kernel/ptrace.c
+++ /dev/null
@@ -1,332 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * arch/sh64/kernel/ptrace.c
- *
- * Copyright (C) 2000, 2001 Paolo Alberelli
- * Copyright (C) 2003 Paul Mundt
- *
- * Started from SH3/4 version:
- * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
- *
- * Original x86 implementation:
- * By Ross Biro 1/23/92
- * edited by Linus Torvalds
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/rwsem.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-#include <linux/errno.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/signal.h>
-#include <linux/syscalls.h>
-
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/processor.h>
-#include <asm/mmu_context.h>
-
-/* This mask defines the bits of the SR which the user is not allowed to
- change, which are everything except S, Q, M, PR, SZ, FR. */
-#define SR_MASK (0xffff8cfd)
-
-/*
- * does not yet catch signals sent when the child dies.
- * in exit.c or in signal.c.
- */
-
-/*
- * This routine will get a word from the user area in the process kernel stack.
- */
-static inline int get_stack_long(struct task_struct *task, int offset)
-{
- unsigned char *stack;
-
- stack = (unsigned char *)(task->thread.uregs);
- stack += offset;
- return (*((int *)stack));
-}
-
-static inline unsigned long
-get_fpu_long(struct task_struct *task, unsigned long addr)
-{
- unsigned long tmp;
- struct pt_regs *regs;
- regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
-
- if (!tsk_used_math(task)) {
- if (addr == offsetof(struct user_fpu_struct, fpscr)) {
- tmp = FPSCR_INIT;
- } else {
- tmp = 0xffffffffUL; /* matches initial value in fpu.c */
- }
- return tmp;
- }
-
- if (last_task_used_math == task) {
- grab_fpu();
- fpsave(&task->thread.fpu.hard);
- release_fpu();
- last_task_used_math = 0;
- regs->sr |= SR_FD;
- }
-
- tmp = ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)];
- return tmp;
-}
-
-/*
- * This routine will put a word into the user area in the process kernel stack.
- */
-static inline int put_stack_long(struct task_struct *task, int offset,
- unsigned long data)
-{
- unsigned char *stack;
-
- stack = (unsigned char *)(task->thread.uregs);
- stack += offset;
- *(unsigned long *) stack = data;
- return 0;
-}
-
-static inline int
-put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
-{
- struct pt_regs *regs;
-
- regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;
-
- if (!tsk_used_math(task)) {
- fpinit(&task->thread.fpu.hard);
- set_stopped_child_used_math(task);
- } else if (last_task_used_math == task) {
- grab_fpu();
- fpsave(&task->thread.fpu.hard);
- release_fpu();
- last_task_used_math = 0;
- regs->sr |= SR_FD;
- }
-
- ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)] = data;
- return 0;
-}
-
-
-long arch_ptrace(struct task_struct *child, long request, long addr, long data)
-{
- int ret;
-
- switch (request) {
- /* when I and D space are separate, these will need to be fixed. */
- case PTRACE_PEEKTEXT: /* read word at location addr. */
- case PTRACE_PEEKDATA:
- ret = generic_ptrace_peekdata(child, addr, data);
- break;
-
- /* read the word at location addr in the USER area. */
- case PTRACE_PEEKUSR: {
- unsigned long tmp;
-
- ret = -EIO;
- if ((addr & 3) || addr < 0)
- break;
-
- if (addr < sizeof(struct pt_regs))
- tmp = get_stack_long(child, addr);
- else if ((addr >= offsetof(struct user, fpu)) &&
- (addr < offsetof(struct user, u_fpvalid))) {
- tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
- } else if (addr == offsetof(struct user, u_fpvalid)) {
- tmp = !!tsk_used_math(child);
- } else {
- break;
- }
- ret = put_user(tmp, (unsigned long *)data);
- break;
- }
-
- /* when I and D space are separate, this will have to be fixed. */
- case PTRACE_POKETEXT: /* write the word at location addr. */
- case PTRACE_POKEDATA:
- ret = generic_ptrace_pokedata(child, addr, data);
- break;
-
- case PTRACE_POKEUSR:
- /* write the word at location addr in the USER area. We must
- disallow any changes to certain SR bits or u_fpvalid, since
- this could crash the kernel or result in a security
- loophole. */
- ret = -EIO;
- if ((addr & 3) || addr < 0)
- break;
-
- if (addr < sizeof(struct pt_regs)) {
- /* Ignore change of top 32 bits of SR */
- if (addr == offsetof (struct pt_regs, sr)+4)
- {
- ret = 0;
- break;
- }
- /* If lower 32 bits of SR, ignore non-user bits */
- if (addr == offsetof (struct pt_regs, sr))
- {
- long cursr = get_stack_long(child, addr);
- data &= ~(SR_MASK);
- data |= (cursr & SR_MASK);
- }
- ret = put_stack_long(child, addr, data);
- }
- else if ((addr >= offsetof(struct user, fpu)) &&
- (addr < offsetof(struct user, u_fpvalid))) {
- ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
- }
- break;
-
- case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
- case PTRACE_CONT: { /* restart after signal. */
- ret = -EIO;
- if (!valid_signal(data))
- break;
- if (request == PTRACE_SYSCALL)
- set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- else
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- child->exit_code = data;
- wake_up_process(child);
- ret = 0;
- break;
- }
-
-/*
- * make the child exit. Best I can do is send it a sigkill.
- * perhaps it should be put in the status that it wants to
- * exit.
- */
- case PTRACE_KILL: {
- ret = 0;
- if (child->exit_state == EXIT_ZOMBIE) /* already dead */
- break;
- child->exit_code = SIGKILL;
- wake_up_process(child);
- break;
- }
-
- case PTRACE_SINGLESTEP: { /* set the trap flag. */
- struct pt_regs *regs;
-
- ret = -EIO;
- if (!valid_signal(data))
- break;
- clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- if ((child->ptrace & PT_DTRACE) == 0) {
- /* Spurious delayed TF traps may occur */
- child->ptrace |= PT_DTRACE;
- }
-
- regs = child->thread.uregs;
-
- regs->sr |= SR_SSTEP; /* auto-resetting upon exception */
-
- child->exit_code = data;
- /* give it a chance to run. */
- wake_up_process(child);
- ret = 0;
- break;
- }
-
- default:
- ret = ptrace_request(child, request, addr, data);
- break;
- }
- return ret;
-}
-
-asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
-{
- extern void poke_real_address_q(unsigned long long addr, unsigned long long data);
-#define WPC_DBRMODE 0x0d104008
- static int first_call = 1;
-
- lock_kernel();
- if (first_call) {
- /* Set WPC.DBRMODE to 0. This makes all debug events get
- * delivered through RESVEC, i.e. into the handlers in entry.S.
- * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
- * would normally be left set to 1, which makes debug events get
- * delivered through DBRVEC, i.e. into the remote gdb's
- * handlers. This prevents ptrace getting them, and confuses
- * the remote gdb.) */
- printk("DBRMODE set to 0 to permit native debugging\n");
- poke_real_address_q(WPC_DBRMODE, 0);
- first_call = 0;
- }
- unlock_kernel();
-
- return sys_ptrace(request, pid, addr, data);
-}
-
-asmlinkage void syscall_trace(void)
-{
- struct task_struct *tsk = current;
-
- if (!test_thread_flag(TIF_SYSCALL_TRACE))
- return;
- if (!(tsk->ptrace & PT_PTRACED))
- return;
-
- 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 (tsk->exit_code) {
- send_sig(tsk->exit_code, tsk, 1);
- tsk->exit_code = 0;
- }
-}
-
-/* Called with interrupts disabled */
-asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
-{
- /* This is called after a single step exception (DEBUGSS).
- There is no need to change the PC, as it is a post-execution
- exception, as entry.S does not do anything to the PC for DEBUGSS.
- We need to clear the Single Step setting in SR to avoid
- continually stepping. */
- local_irq_enable();
- regs->sr &= ~SR_SSTEP;
- force_sig(SIGTRAP, current);
-}
-
-/* Called with interrupts disabled */
-asmlinkage void do_software_break_point(unsigned long long vec,
- struct pt_regs *regs)
-{
- /* We need to forward step the PC, to counteract the backstep done
- in signal.c. */
- local_irq_enable();
- force_sig(SIGTRAP, current);
- regs->pc += 4;
-}
-
-/*
- * Called by kernel/ptrace.c when detaching..
- *
- * Make sure single step bits etc are not set.
- */
-void ptrace_disable(struct task_struct *child)
-{
- /* nothing to do.. */
-}