2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
7 #include <linux/sched.h>
8 #include <linux/uaccess.h>
9 #include <asm/ptrace-abi.h>
10 #include <registers.h>
13 extern int arch_switch_tls(struct task_struct *to);
15 void arch_switch_to(struct task_struct *to)
17 int err = arch_switch_tls(to);
22 printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
23 "not EINVAL\n", -err);
25 printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
28 /* determines which flags the user has access to. */
29 /* 1 = access 0 = no access */
30 #define FLAG_MASK 0x00044dd5
32 static const int reg_offsets[] = {
49 [ORIG_EAX] = HOST_ORIG_AX,
52 int putreg(struct task_struct *child, int regno, unsigned long value)
67 /* Update the syscall number. */
68 UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
71 if (value && (value & 3) != 3)
75 if (value && (value & 3) != 3)
80 if (value && (value & 3) != 3)
92 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
95 panic("Bad register in putreg() : %d\n", regno);
97 child->thread.regs.regs.gp[reg_offsets[regno]] = value;
101 int poke_user(struct task_struct *child, long addr, long data)
103 if ((addr & 3) || addr < 0)
106 if (addr < MAX_REG_OFFSET)
107 return putreg(child, addr, data);
108 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
109 (addr <= offsetof(struct user, u_debugreg[7]))) {
110 addr -= offsetof(struct user, u_debugreg[0]);
112 if ((addr == 4) || (addr == 5))
114 child->thread.arch.debugregs[addr] = data;
120 unsigned long getreg(struct task_struct *child, int regno)
122 unsigned long mask = ~0UL;
147 panic("Bad register in getreg() : %d\n", regno);
149 return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
152 /* read the word at location addr in the USER area. */
153 int peek_user(struct task_struct *child, long addr, long data)
157 if ((addr & 3) || addr < 0)
160 tmp = 0; /* Default return condition */
161 if (addr < MAX_REG_OFFSET) {
162 tmp = getreg(child, addr);
164 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
165 (addr <= offsetof(struct user, u_debugreg[7]))) {
166 addr -= offsetof(struct user, u_debugreg[0]);
168 tmp = child->thread.arch.debugregs[addr];
170 return put_user(tmp, (unsigned long __user *) data);
173 static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
175 int err, n, cpu = task_cpu(child);
176 struct user_i387_struct fpregs;
178 err = save_i387_registers(userspace_pid[cpu],
179 (unsigned long *) &fpregs);
183 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
190 static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
192 int n, cpu = task_cpu(child);
193 struct user_i387_struct fpregs;
195 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
199 return restore_i387_registers(userspace_pid[cpu],
200 (unsigned long *) &fpregs);
203 static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
205 int err, n, cpu = task_cpu(child);
206 struct user_fxsr_struct fpregs;
208 err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
212 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
219 static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
221 int n, cpu = task_cpu(child);
222 struct user_fxsr_struct fpregs;
224 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
228 return restore_fpx_registers(userspace_pid[cpu],
229 (unsigned long *) &fpregs);
232 long subarch_ptrace(struct task_struct *child, long request,
233 unsigned long addr, unsigned long data)
236 void __user *datap = (void __user *) data;
238 case PTRACE_GETFPREGS: /* Get the child FPU state. */
239 ret = get_fpregs(datap, child);
241 case PTRACE_SETFPREGS: /* Set the child FPU state. */
242 ret = set_fpregs(datap, child);
244 case PTRACE_GETFPXREGS: /* Get the child FPU state. */
245 ret = get_fpxregs(datap, child);
247 case PTRACE_SETFPXREGS: /* Set the child FPU state. */
248 ret = set_fpxregs(datap, child);