2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
7 #include <linux/sched.h>
8 #include <asm/uaccess.h>
9 #include <asm/ptrace-abi.h>
12 extern int arch_switch_tls(struct task_struct *to);
14 void arch_switch_to(struct task_struct *to)
16 int err = arch_switch_tls(to);
21 printk(KERN_WARNING "arch_switch_tls failed, errno %d, "
22 "not EINVAL\n", -err);
24 printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
27 int is_syscall(unsigned long addr)
32 n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
34 /* access_process_vm() grants access to vsyscall and stub,
35 * while copy_from_user doesn't. Maybe access_process_vm is
36 * slow, but that doesn't matter, since it will be called only
37 * in case of singlestepping, if copy_from_user failed.
39 n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
40 if (n != sizeof(instr)) {
41 printk(KERN_ERR "is_syscall : failed to read "
42 "instruction from 0x%lx\n", addr);
46 /* int 0x80 or sysenter */
47 return (instr == 0x80cd) || (instr == 0x340f);
50 /* determines which flags the user has access to. */
51 /* 1 = access 0 = no access */
52 #define FLAG_MASK 0x00044dd5
54 static const int reg_offsets[] = {
73 int putreg(struct task_struct *child, int regno, unsigned long value)
88 if (value && (value & 3) != 3)
92 if (value && (value & 3) != 3)
97 if (value && (value & 3) != 3)
103 if ((value & 3) != 3)
109 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
112 child->thread.regs.regs.syscall = value;
115 panic("Bad register in putreg() : %d\n", regno);
117 child->thread.regs.regs.gp[reg_offsets[regno]] = value;
121 int poke_user(struct task_struct *child, long addr, long data)
123 if ((addr & 3) || addr < 0)
126 if (addr < MAX_REG_OFFSET)
127 return putreg(child, addr, data);
128 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
129 (addr <= offsetof(struct user, u_debugreg[7]))) {
130 addr -= offsetof(struct user, u_debugreg[0]);
132 if ((addr == 4) || (addr == 5))
134 child->thread.arch.debugregs[addr] = data;
140 unsigned long getreg(struct task_struct *child, int regno)
142 unsigned long mask = ~0UL;
147 return child->thread.regs.regs.syscall;
168 panic("Bad register in getreg() : %d\n", regno);
170 return mask & child->thread.regs.regs.gp[reg_offsets[regno]];
173 /* read the word at location addr in the USER area. */
174 int peek_user(struct task_struct *child, long addr, long data)
178 if ((addr & 3) || addr < 0)
181 tmp = 0; /* Default return condition */
182 if (addr < MAX_REG_OFFSET) {
183 tmp = getreg(child, addr);
185 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
186 (addr <= offsetof(struct user, u_debugreg[7]))) {
187 addr -= offsetof(struct user, u_debugreg[0]);
189 tmp = child->thread.arch.debugregs[addr];
191 return put_user(tmp, (unsigned long __user *) data);
194 static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
196 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
197 struct user_i387_struct fpregs;
199 err = save_fp_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
203 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
210 static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
212 int n, cpu = ((struct thread_info *) child->stack)->cpu;
213 struct user_i387_struct fpregs;
215 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
219 return restore_fp_registers(userspace_pid[cpu],
220 (unsigned long *) &fpregs);
223 static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
225 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
226 struct user_fxsr_struct fpregs;
228 err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs);
232 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
239 static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child)
241 int n, cpu = ((struct thread_info *) child->stack)->cpu;
242 struct user_fxsr_struct fpregs;
244 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
248 return restore_fpx_registers(userspace_pid[cpu],
249 (unsigned long *) &fpregs);
252 long subarch_ptrace(struct task_struct *child, long request,
253 unsigned long addr, unsigned long data)
256 void __user *datap = (void __user *) data;
258 case PTRACE_GETFPREGS: /* Get the child FPU state. */
259 ret = get_fpregs(datap, child);
261 case PTRACE_SETFPREGS: /* Set the child FPU state. */
262 ret = set_fpregs(datap, child);
264 case PTRACE_GETFPXREGS: /* Get the child FPU state. */
265 ret = get_fpxregs(datap, child);
267 case PTRACE_SETFPXREGS: /* Set the child FPU state. */
268 ret = set_fpxregs(datap, child);