1 files changed, 187 insertions, 0 deletions

diff --git a/arch/c6x/kernel/ptrace.c b/arch/c6x/kernel/ptrace.c
new file mode 100644
index 000000000000..3c494e84444d
--- /dev/null
+++ b/arch/c6x/kernel/ptrace.c
@@ -0,0 +1,187 @@
+/*
+ *  Port on Texas Instruments TMS320C6x architecture
+ *
+ *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
+ *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ *  Updated for 2.6.34: Mark Salter <msalter@redhat.com>
+ *
+ *  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.
+ */
+#include <linux/ptrace.h>
+#include <linux/tracehook.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
+
+#include <asm/cacheflush.h>
+
+#define PT_REG_SIZE       (sizeof(struct pt_regs))
+
+/*
+ * Called by kernel/ptrace.c when detaching.
+ */
+void ptrace_disable(struct task_struct *child)
+{
+        /* nothing to do */
+}
+
+/*
+ * Get a register number from live pt_regs for the specified task.
+ */
+static inline long get_reg(struct task_struct *task, int regno)
+{
+        long *addr = (long *)task_pt_regs(task);
+
+        if (regno == PT_TSR || regno == PT_CSR)
+                return 0;
+
+        return addr[regno];
+}
+
+/*
+ * Write contents of register REGNO in task TASK.
+ */
+static inline int put_reg(struct task_struct *task,
+                          int regno,
+                          unsigned long data)
+{
+        unsigned long *addr = (unsigned long *)task_pt_regs(task);
+
+        if (regno != PT_TSR && regno != PT_CSR)
+                addr[regno] = data;
+
+        return 0;
+}
+
+/* regset get/set implementations */
+
+static int gpr_get(struct task_struct *target,
+                   const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   void *kbuf, void __user *ubuf)
+{
+        struct pt_regs *regs = task_pt_regs(target);
+
+        return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+                                   regs,
+                                   0, sizeof(*regs));
+}
+
+static int gpr_set(struct task_struct *target,
+                   const struct user_regset *regset,
+                   unsigned int pos, unsigned int count,
+                   const void *kbuf, const void __user *ubuf)
+{
+        int ret;
+        struct pt_regs *regs = task_pt_regs(target);
+
+        /* Don't copyin TSR or CSR */
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                 &regs,
+                                 0, PT_TSR * sizeof(long));
+        if (ret)
+                return ret;
+
+        ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                        PT_TSR * sizeof(long),
+                                        (PT_TSR + 1) * sizeof(long));
+        if (ret)
+                return ret;
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                 &regs,
+                                 (PT_TSR + 1) * sizeof(long),
+                                 PT_CSR * sizeof(long));
+        if (ret)
+                return ret;
+
+        ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
+                                        PT_CSR * sizeof(long),
+                                        (PT_CSR + 1) * sizeof(long));
+        if (ret)
+                return ret;
+
+        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+                                 &regs,
+                                 (PT_CSR + 1) * sizeof(long), -1);
+        return ret;
+}
+
+enum c6x_regset {
+        REGSET_GPR,
+};
+
+static const struct user_regset c6x_regsets[] = {
+        [REGSET_GPR] = {
+                .core_note_type = NT_PRSTATUS,
+                .n = ELF_NGREG,
+                .size = sizeof(u32),
+                .align = sizeof(u32),
+                .get = gpr_get,
+                .set = gpr_set
+        },
+};
+
+static const struct user_regset_view user_c6x_native_view = {
+        .name           = "tic6x",
+        .e_machine      = EM_TI_C6000,
+        .regsets        = c6x_regsets,
+        .n              = ARRAY_SIZE(c6x_regsets),
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+        return &user_c6x_native_view;
+}
+
+/*
+ * Perform ptrace request
+ */
+long arch_ptrace(struct task_struct *child, long request,
+                 unsigned long addr, unsigned long data)
+{
+        int ret = 0;
+
+        switch (request) {
+                /*
+                 * write the word at location addr.
+                 */
+        case PTRACE_POKETEXT:
+                ret = generic_ptrace_pokedata(child, addr, data);
+                if (ret == 0 && request == PTRACE_POKETEXT)
+                        flush_icache_range(addr, addr + 4);
+                break;
+        default:
+                ret = ptrace_request(child, request, addr, data);
+                break;
+        }
+
+        return ret;
+}
+
+/*
+ * handle tracing of system call entry
+ * - return the revised system call number or ULONG_MAX to cause ENOSYS
+ */
+asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
+{
+        if (tracehook_report_syscall_entry(regs))
+                /* tracing decided this syscall should not happen, so
+                 * We'll return a bogus call number to get an ENOSYS
+                 * error, but leave the original number in
+                 * regs->orig_a4
+                 */
+                return ULONG_MAX;
+
+        return regs->b0;
+}
+
+/*
+ * handle tracing of system call exit
+ */
+asmlinkage void syscall_trace_exit(struct pt_regs *regs)
+{
+        tracehook_report_syscall_exit(regs, 0);
+}