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 void arch_switch_to(struct task_struct *to)
15 int err = arch_switch_tls(to);
20 printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
21 "not EINVAL\n", -err);
23 printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
26 /* determines which flags the user has access to. */
27 /* 1 = access 0 = no access */
28 #define FLAG_MASK 0x00044dd5
30 static const int reg_offsets[] = {
47 [ORIG_EAX] = HOST_ORIG_AX,
50 int putreg(struct task_struct *child, int regno, unsigned long value)
65 /* Update the syscall number. */
66 UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
69 if (value && (value & 3) != 3)
73 if (value && (value & 3) != 3)
78 if (value && (value & 3) != 3)
90 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
93 panic("Bad register in putreg() : %d\n", regno);
95 child->thread.regs.regs.gp[reg_offsets[regno]] = value;
99 int poke_user(struct task_struct *child, long addr, long data)
101 if ((addr & 3) || addr < 0)
104 if (addr < MAX_REG_OFFSET)
105 return putreg(child, addr, data);
106 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
107 (addr <= offsetof(struct user, u_debugreg[7]))) {
108 addr -= offsetof(struct user, u_debugreg[0]);
110 if ((addr == 4) || (addr == 5))
112 child->thread.arch.debugregs[addr] = data;
118 unsigned long getreg(struct task_struct *child, int regno)
120 unsigned long mask = ~0UL;
145 panic("Bad register in getreg() : %d\n", regno);
147 return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
150 /* read the word at location addr in the USER area. */
151 int peek_user(struct task_struct *child, long addr, long data)
155 if ((addr & 3) || addr < 0)
158 tmp = 0; /* Default return condition */
159 if (addr < MAX_REG_OFFSET) {
160 tmp = getreg(child, addr);
162 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
163 (addr <= offsetof(struct user, u_debugreg[7]))) {
164 addr -= offsetof(struct user, u_debugreg[0]);
166 tmp = child->thread.arch.debugregs[addr];
168 return put_user(tmp, (unsigned long __user *) data);
171 static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
173 int err, n, cpu = task_cpu(child);
174 struct user_i387_struct fpregs;
176 err = save_i387_registers(userspace_pid[cpu],
177 (unsigned long *) &fpregs);
181 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
188 static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
190 int n, cpu = task_cpu(child);
191 struct user_i387_struct fpregs;
193 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
197 return restore_i387_registers(userspace_pid[cpu],
198 (unsigned long *) &fpregs);
201 static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
203 int err, n, cpu = task_cpu(child);
204 struct user_fxsr_struct fpregs;
206 err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
210 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
217 static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
219 int n, cpu = task_cpu(child);
220 struct user_fxsr_struct fpregs;
222 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
226 return restore_fpx_registers(userspace_pid[cpu],
227 (unsigned long *) &fpregs);
230 long subarch_ptrace(struct task_struct *child, long request,
231 unsigned long addr, unsigned long data)
234 void __user *datap = (void __user *) data;
236 case PTRACE_GETFPREGS: /* Get the child FPU state. */
237 ret = get_fpregs(datap, child);
239 case PTRACE_SETFPREGS: /* Set the child FPU state. */
240 ret = set_fpregs(datap, child);
242 case PTRACE_GETFPXREGS: /* Get the child FPU state. */
243 ret = get_fpxregs(datap, child);
245 case PTRACE_SETFPXREGS: /* Set the child FPU state. */
246 ret = set_fpxregs(datap, child);