2 * Copyright 2003 PathScale, Inc.
3 * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
5 * Licensed under the GPL
9 #include <linux/sched.h>
10 #include <linux/errno.h>
11 #define __FRAME_OFFSETS
12 #include <asm/ptrace.h>
13 #include <linux/uaccess.h>
14 #include <asm/ptrace-abi.h>
17 * determines which flags the user has access to.
18 * 1 = access 0 = no access
20 #define FLAG_MASK 0x44dd5UL
22 static const int reg_offsets[] =
26 [R10 >> 3] = HOST_R10,
27 [R11 >> 3] = HOST_R11,
28 [R12 >> 3] = HOST_R12,
29 [R13 >> 3] = HOST_R13,
30 [R14 >> 3] = HOST_R14,
31 [R15 >> 3] = HOST_R15,
43 [FS_BASE >> 3] = HOST_FS_BASE,
44 [GS_BASE >> 3] = HOST_GS_BASE,
49 [EFLAGS >> 3] = HOST_EFLAGS,
50 [ORIG_RAX >> 3] = HOST_ORIG_AX,
53 int putreg(struct task_struct *child, int regno, unsigned long value)
76 /* Update the syscall number. */
77 UPT_SYSCALL_NR(&child->thread.regs.regs) = value;
86 if (value && (value & 3) != 3)
93 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
99 child->thread.regs.regs.gp[HOST_EFLAGS] |= value;
103 panic("Bad register in putreg(): %d\n", regno);
106 child->thread.regs.regs.gp[reg_offsets[regno >> 3]] = value;
110 int poke_user(struct task_struct *child, long addr, long data)
112 if ((addr & 3) || addr < 0)
115 if (addr < MAX_REG_OFFSET)
116 return putreg(child, addr, data);
117 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
118 (addr <= offsetof(struct user, u_debugreg[7]))) {
119 addr -= offsetof(struct user, u_debugreg[0]);
121 if ((addr == 4) || (addr == 5))
123 child->thread.arch.debugregs[addr] = data;
129 unsigned long getreg(struct task_struct *child, int regno)
131 unsigned long mask = ~0UL;
165 panic("Bad register in getreg: %d\n", regno);
167 return mask & child->thread.regs.regs.gp[reg_offsets[regno >> 3]];
170 int peek_user(struct task_struct *child, long addr, long data)
172 /* read the word at location addr in the USER area. */
175 if ((addr & 3) || addr < 0)
178 tmp = 0; /* Default return condition */
179 if (addr < MAX_REG_OFFSET)
180 tmp = getreg(child, addr);
181 else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
182 (addr <= offsetof(struct user, u_debugreg[7]))) {
183 addr -= offsetof(struct user, u_debugreg[0]);
185 tmp = child->thread.arch.debugregs[addr];
187 return put_user(tmp, (unsigned long *) data);
190 /* XXX Mostly copied from sys-i386 */
191 int is_syscall(unsigned long addr)
193 unsigned short instr;
196 n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
199 * access_process_vm() grants access to vsyscall and stub,
200 * while copy_from_user doesn't. Maybe access_process_vm is
201 * slow, but that doesn't matter, since it will be called only
202 * in case of singlestepping, if copy_from_user failed.
204 n = access_process_vm(current, addr, &instr, sizeof(instr),
206 if (n != sizeof(instr)) {
207 printk("is_syscall : failed to read instruction from "
213 return instr == 0x050f;
216 static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
218 int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
219 struct user_i387_struct fpregs;
221 err = save_i387_registers(userspace_pid[cpu],
222 (unsigned long *) &fpregs);
226 n = copy_to_user(buf, &fpregs, sizeof(fpregs));
233 static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
235 int n, cpu = ((struct thread_info *) child->stack)->cpu;
236 struct user_i387_struct fpregs;
238 n = copy_from_user(&fpregs, buf, sizeof(fpregs));
242 return restore_i387_registers(userspace_pid[cpu],
243 (unsigned long *) &fpregs);
246 long subarch_ptrace(struct task_struct *child, long request,
247 unsigned long addr, unsigned long data)
250 void __user *datap = (void __user *) data;
253 case PTRACE_GETFPREGS: /* Get the child FPU state. */
254 ret = get_fpregs(datap, child);
256 case PTRACE_SETFPREGS: /* Set the child FPU state. */
257 ret = set_fpregs(datap, child);
259 case PTRACE_ARCH_PRCTL:
260 /* XXX Calls ptrace on the host - needs some SMP thinking */
261 ret = arch_prctl(child, data, (void __user *) addr);