sh: Move in the SH-5 ptrace impl.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 332 insertions, 0 deletions

diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c
new file mode 100644
index 000000000000..8a2d339cf760
--- /dev/null
+++ b/arch/sh/kernel/ptrace_64.c
@@ -0,0 +1,332 @@
+/*
+ * 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.. */
+}