sh: Move in the SH-5 ptrace impl.

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

1 files changed, 274 insertions, 0 deletions

diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c
new file mode 100644
index 000000000000..ac725f0aeb72
--- /dev/null
+++ b/arch/sh/kernel/ptrace_32.c
@@ -0,0 +1,274 @@
+/*
+ * linux/arch/sh/kernel/ptrace.c
+ *
+ * Original x86 implementation:
+ *      By Ross Biro 1/23/92
+ *      edited by Linus Torvalds
+ *
+ * SuperH version:   Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/user.h>
+#include <linux/slab.h>
+#include <linux/security.h>
+#include <linux/signal.h>
+#include <linux/io.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/processor.h>
+#include <asm/mmu_context.h>
+
+/*
+ * does not yet catch signals sent when the child dies.
+ * in exit.c or in signal.c.
+ */
+
+/*
+ * This routine will get a word off of the process kernel stack.
+ */
+static inline int get_stack_long(struct task_struct *task, int offset)
+{
+        unsigned char *stack;
+
+        stack = (unsigned char *)task_pt_regs(task);
+        stack += offset;
+        return (*((int *)stack));
+}
+
+/*
+ * This routine will put a word on 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_pt_regs(task);
+        stack += offset;
+        *(unsigned long *) stack = data;
+        return 0;
+}
+
+static void ptrace_disable_singlestep(struct task_struct *child)
+{
+        clear_tsk_thread_flag(child, TIF_SINGLESTEP);
+
+        /*
+         * Ensure the UBC is not programmed at the next context switch.
+         *
+         * Normally this is not needed but there are sequences such as
+         * singlestep, signal delivery, and continue that leave the
+         * ubc_pc non-zero leading to spurious SIGTRAPs.
+         */
+        if (child->thread.ubc_pc != 0) {
+                ubc_usercnt -= 1;
+                child->thread.ubc_pc = 0;
+        }
+}
+
+/*
+ * Called by kernel/ptrace.c when detaching..
+ *
+ * Make sure single step bits etc are not set.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+        ptrace_disable_singlestep(child);
+}
+
+long arch_ptrace(struct task_struct *child, long request, long addr, long data)
+{
+        struct user * dummy = NULL;
+        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 ||
+                    addr > sizeof(struct user) - 3)
+                        break;
+
+                if (addr < sizeof(struct pt_regs))
+                        tmp = get_stack_long(child, addr);
+                else if (addr >= (long) &dummy->fpu &&
+                         addr < (long) &dummy->u_fpvalid) {
+                        if (!tsk_used_math(child)) {
+                                if (addr == (long)&dummy->fpu.fpscr)
+                                        tmp = FPSCR_INIT;
+                                else
+                                        tmp = 0;
+                        } else
+                                tmp = ((long *)&child->thread.fpu)
+                                        [(addr - (long)&dummy->fpu) >> 2];
+                } else if (addr == (long) &dummy->u_fpvalid)
+                        tmp = !!tsk_used_math(child);
+                else
+                        tmp = 0;
+                ret = put_user(tmp, (unsigned long __user *)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 */
+                ret = -EIO;
+                if ((addr & 3) || addr < 0 ||
+                    addr > sizeof(struct user) - 3)
+                        break;
+
+                if (addr < sizeof(struct pt_regs))
+                        ret = put_stack_long(child, addr, data);
+                else if (addr >= (long) &dummy->fpu &&
+                         addr < (long) &dummy->u_fpvalid) {
+                        set_stopped_child_used_math(child);
+                        ((long *)&child->thread.fpu)
+                                [(addr - (long)&dummy->fpu) >> 2] = data;
+                        ret = 0;
+                } else if (addr == (long) &dummy->u_fpvalid) {
+                        conditional_stopped_child_used_math(data, child);
+                        ret = 0;
+                }
+                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);
+
+                ptrace_disable_singlestep(child);
+
+                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;
+                ptrace_disable_singlestep(child);
+                child->exit_code = SIGKILL;
+                wake_up_process(child);
+                break;
+        }
+
+        case PTRACE_SINGLESTEP: {  /* set the trap flag. */
+                long pc;
+                struct pt_regs *regs = NULL;
+
+                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;
+                }
+
+                pc = get_stack_long(child, (long)&regs->pc);
+
+                /* Next scheduling will set up UBC */
+                if (child->thread.ubc_pc == 0)
+                        ubc_usercnt += 1;
+                child->thread.ubc_pc = pc;
+
+                set_tsk_thread_flag(child, TIF_SINGLESTEP);
+                child->exit_code = data;
+                /* give it a chance to run. */
+                wake_up_process(child);
+                ret = 0;
+                break;
+        }
+
+#ifdef CONFIG_SH_DSP
+        case PTRACE_GETDSPREGS: {
+                unsigned long dp;
+
+                ret = -EIO;
+                dp = ((unsigned long) child) + THREAD_SIZE -
+                         sizeof(struct pt_dspregs);
+                if (*((int *) (dp - 4)) == SR_FD) {
+                        copy_to_user(addr, (void *) dp,
+                                sizeof(struct pt_dspregs));
+                        ret = 0;
+                }
+                break;
+        }
+
+        case PTRACE_SETDSPREGS: {
+                unsigned long dp;
+
+                ret = -EIO;
+                dp = ((unsigned long) child) + THREAD_SIZE -
+                         sizeof(struct pt_dspregs);
+                if (*((int *) (dp - 4)) == SR_FD) {
+                        copy_from_user((void *) dp, addr,
+                                sizeof(struct pt_dspregs));
+                        ret = 0;
+                }
+                break;
+        }
+#endif
+        default:
+                ret = ptrace_request(child, request, addr, data);
+                break;
+        }
+
+        return ret;
+}
+
+asmlinkage void do_syscall_trace(void)
+{
+        struct task_struct *tsk = current;
+
+        if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
+            !test_thread_flag(TIF_SINGLESTEP))
+                return;
+        if (!(tsk->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) &&
+                                 !test_thread_flag(TIF_SINGLESTEP) ? 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;
+        }
+}