Added missing tegra files.HEADmaster

1 files changed, 228 insertions, 0 deletions

diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
new file mode 100644
index 00000000000..3375c271785
--- /dev/null
+++ b/arch/um/sys-i386/ptrace.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/mm.h"
+#include "linux/sched.h"
+#include "asm/uaccess.h"
+#include "skas.h"
+
+extern int arch_switch_tls(struct task_struct *to);
+
+void arch_switch_to(struct task_struct *to)
+{
+        int err = arch_switch_tls(to);
+        if (!err)
+                return;
+
+        if (err != -EINVAL)
+                printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
+                       "not EINVAL\n", -err);
+        else
+                printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
+}
+
+int is_syscall(unsigned long addr)
+{
+        unsigned short instr;
+        int n;
+
+        n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
+        if (n) {
+                /* access_process_vm() grants access to vsyscall and stub,
+                 * while copy_from_user doesn't. Maybe access_process_vm is
+                 * slow, but that doesn't matter, since it will be called only
+                 * in case of singlestepping, if copy_from_user failed.
+                 */
+                n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
+                if (n != sizeof(instr)) {
+                        printk(KERN_ERR "is_syscall : failed to read "
+                               "instruction from 0x%lx\n", addr);
+                        return 1;
+                }
+        }
+        /* int 0x80 or sysenter */
+        return (instr == 0x80cd) || (instr == 0x340f);
+}
+
+/* determines which flags the user has access to. */
+/* 1 = access 0 = no access */
+#define FLAG_MASK 0x00044dd5
+
+int putreg(struct task_struct *child, int regno, unsigned long value)
+{
+        regno >>= 2;
+        switch (regno) {
+        case FS:
+                if (value && (value & 3) != 3)
+                        return -EIO;
+                PT_REGS_FS(&child->thread.regs) = value;
+                return 0;
+        case GS:
+                if (value && (value & 3) != 3)
+                        return -EIO;
+                PT_REGS_GS(&child->thread.regs) = value;
+                return 0;
+        case DS:
+        case ES:
+                if (value && (value & 3) != 3)
+                        return -EIO;
+                value &= 0xffff;
+                break;
+        case SS:
+        case CS:
+                if ((value & 3) != 3)
+                        return -EIO;
+                value &= 0xffff;
+                break;
+        case EFL:
+                value &= FLAG_MASK;
+                value |= PT_REGS_EFLAGS(&child->thread.regs);
+                break;
+        }
+        PT_REGS_SET(&child->thread.regs, regno, value);
+        return 0;
+}
+
+int poke_user(struct task_struct *child, long addr, long data)
+{
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        if (addr < MAX_REG_OFFSET)
+                return putreg(child, addr, data);
+        else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
+                 (addr <= offsetof(struct user, u_debugreg[7]))) {
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                if ((addr == 4) || (addr == 5))
+                        return -EIO;
+                child->thread.arch.debugregs[addr] = data;
+                return 0;
+        }
+        return -EIO;
+}
+
+unsigned long getreg(struct task_struct *child, int regno)
+{
+        unsigned long retval = ~0UL;
+
+        regno >>= 2;
+        switch (regno) {
+        case FS:
+        case GS:
+        case DS:
+        case ES:
+        case SS:
+        case CS:
+                retval = 0xffff;
+                /* fall through */
+        default:
+                retval &= PT_REG(&child->thread.regs, regno);
+        }
+        return retval;
+}
+
+/* read the word at location addr in the USER area. */
+int peek_user(struct task_struct *child, long addr, long data)
+{
+        unsigned long tmp;
+
+        if ((addr & 3) || addr < 0)
+                return -EIO;
+
+        tmp = 0;  /* Default return condition */
+        if (addr < MAX_REG_OFFSET) {
+                tmp = getreg(child, addr);
+        }
+        else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
+                 (addr <= offsetof(struct user, u_debugreg[7]))) {
+                addr -= offsetof(struct user, u_debugreg[0]);
+                addr = addr >> 2;
+                tmp = child->thread.arch.debugregs[addr];
+        }
+        return put_user(tmp, (unsigned long __user *) data);
+}
+
+static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
+{
+        int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
+        struct user_i387_struct fpregs;
+
+        err = save_fp_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
+        if (err)
+                return err;
+
+        n = copy_to_user(buf, &fpregs, sizeof(fpregs));
+        if(n > 0)
+                return -EFAULT;
+
+        return n;
+}
+
+static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
+{
+        int n, cpu = ((struct thread_info *) child->stack)->cpu;
+        struct user_i387_struct fpregs;
+
+        n = copy_from_user(&fpregs, buf, sizeof(fpregs));
+        if (n > 0)
+                return -EFAULT;
+
+        return restore_fp_registers(userspace_pid[cpu],
+                                    (unsigned long *) &fpregs);
+}
+
+static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
+{
+        int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
+        struct user_fxsr_struct fpregs;
+
+        err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
+        if (err)
+                return err;
+
+        n = copy_to_user(buf, &fpregs, sizeof(fpregs));
+        if(n > 0)
+                return -EFAULT;
+
+        return n;
+}
+
+static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
+{
+        int n, cpu = ((struct thread_info *) child->stack)->cpu;
+        struct user_fxsr_struct fpregs;
+
+        n = copy_from_user(&fpregs, buf, sizeof(fpregs));
+        if (n > 0)
+                return -EFAULT;
+
+        return restore_fpx_registers(userspace_pid[cpu],
+                                     (unsigned long *) &fpregs);
+}
+
+long subarch_ptrace(struct task_struct *child, long request,
+                    unsigned long addr, unsigned long data)
+{
+        int ret = -EIO;
+        void __user *datap = (void __user *) data;
+        switch (request) {
+        case PTRACE_GETFPREGS: /* Get the child FPU state. */
+                ret = get_fpregs(datap, child);
+                break;
+        case PTRACE_SETFPREGS: /* Set the child FPU state. */
+                ret = set_fpregs(datap, child);
+                break;
+        case PTRACE_GETFPXREGS: /* Get the child FPU state. */
+                ret = get_fpxregs(datap, child);
+                break;
+        case PTRACE_SETFPXREGS: /* Set the child FPU state. */
+                ret = set_fpxregs(datap, child);
+                break;
+        default:
+                ret = -EIO;
+        }
+        return ret;
+}