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277 lines
6.0 KiB
277 lines
6.0 KiB
/* |
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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* Licensed under the GPL |
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*/ |
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#include <linux/mm.h> |
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#include <linux/sched.h> |
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#include <linux/uaccess.h> |
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#include <asm/ptrace-abi.h> |
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#include <skas.h> |
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extern int arch_switch_tls(struct task_struct *to); |
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void arch_switch_to(struct task_struct *to) |
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{ |
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int err = arch_switch_tls(to); |
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if (!err) |
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return; |
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if (err != -EINVAL) |
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printk(KERN_WARNING "arch_switch_tls failed, errno %d, " |
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"not EINVAL\n", -err); |
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else |
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printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n"); |
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} |
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int is_syscall(unsigned long addr) |
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{ |
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unsigned short instr; |
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int n; |
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n = copy_from_user(&instr, (void __user *) addr, sizeof(instr)); |
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if (n) { |
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/* access_process_vm() grants access to vsyscall and stub, |
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* while copy_from_user doesn't. Maybe access_process_vm is |
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* slow, but that doesn't matter, since it will be called only |
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* in case of singlestepping, if copy_from_user failed. |
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*/ |
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n = access_process_vm(current, addr, &instr, sizeof(instr), |
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FOLL_FORCE); |
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if (n != sizeof(instr)) { |
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printk(KERN_ERR "is_syscall : failed to read " |
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"instruction from 0x%lx\n", addr); |
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return 1; |
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} |
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} |
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/* int 0x80 or sysenter */ |
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return (instr == 0x80cd) || (instr == 0x340f); |
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} |
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/* determines which flags the user has access to. */ |
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/* 1 = access 0 = no access */ |
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#define FLAG_MASK 0x00044dd5 |
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static const int reg_offsets[] = { |
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[EBX] = HOST_BX, |
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[ECX] = HOST_CX, |
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[EDX] = HOST_DX, |
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[ESI] = HOST_SI, |
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[EDI] = HOST_DI, |
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[EBP] = HOST_BP, |
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[EAX] = HOST_AX, |
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[DS] = HOST_DS, |
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[ES] = HOST_ES, |
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[FS] = HOST_FS, |
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[GS] = HOST_GS, |
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[EIP] = HOST_IP, |
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[CS] = HOST_CS, |
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[EFL] = HOST_EFLAGS, |
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[UESP] = HOST_SP, |
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[SS] = HOST_SS, |
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[ORIG_EAX] = HOST_ORIG_AX, |
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}; |
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int putreg(struct task_struct *child, int regno, unsigned long value) |
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{ |
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regno >>= 2; |
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switch (regno) { |
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case EBX: |
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case ECX: |
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case EDX: |
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case ESI: |
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case EDI: |
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case EBP: |
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case EAX: |
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case EIP: |
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case UESP: |
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break; |
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case ORIG_EAX: |
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/* Update the syscall number. */ |
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UPT_SYSCALL_NR(&child->thread.regs.regs) = value; |
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break; |
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case FS: |
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if (value && (value & 3) != 3) |
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return -EIO; |
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break; |
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case GS: |
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if (value && (value & 3) != 3) |
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return -EIO; |
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break; |
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case DS: |
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case ES: |
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if (value && (value & 3) != 3) |
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return -EIO; |
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value &= 0xffff; |
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break; |
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case SS: |
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case CS: |
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if ((value & 3) != 3) |
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return -EIO; |
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value &= 0xffff; |
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break; |
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case EFL: |
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value &= FLAG_MASK; |
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child->thread.regs.regs.gp[HOST_EFLAGS] |= value; |
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return 0; |
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default : |
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panic("Bad register in putreg() : %d\n", regno); |
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} |
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child->thread.regs.regs.gp[reg_offsets[regno]] = value; |
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return 0; |
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} |
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int poke_user(struct task_struct *child, long addr, long data) |
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{ |
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if ((addr & 3) || addr < 0) |
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return -EIO; |
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if (addr < MAX_REG_OFFSET) |
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return putreg(child, addr, data); |
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else if ((addr >= offsetof(struct user, u_debugreg[0])) && |
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(addr <= offsetof(struct user, u_debugreg[7]))) { |
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addr -= offsetof(struct user, u_debugreg[0]); |
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addr = addr >> 2; |
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if ((addr == 4) || (addr == 5)) |
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return -EIO; |
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child->thread.arch.debugregs[addr] = data; |
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return 0; |
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} |
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return -EIO; |
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} |
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unsigned long getreg(struct task_struct *child, int regno) |
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{ |
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unsigned long mask = ~0UL; |
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regno >>= 2; |
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switch (regno) { |
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case FS: |
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case GS: |
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case DS: |
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case ES: |
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case SS: |
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case CS: |
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mask = 0xffff; |
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break; |
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case EIP: |
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case UESP: |
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case EAX: |
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case EBX: |
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case ECX: |
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case EDX: |
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case ESI: |
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case EDI: |
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case EBP: |
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case EFL: |
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case ORIG_EAX: |
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break; |
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default: |
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panic("Bad register in getreg() : %d\n", regno); |
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} |
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return mask & child->thread.regs.regs.gp[reg_offsets[regno]]; |
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} |
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/* read the word at location addr in the USER area. */ |
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int peek_user(struct task_struct *child, long addr, long data) |
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{ |
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unsigned long tmp; |
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if ((addr & 3) || addr < 0) |
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return -EIO; |
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tmp = 0; /* Default return condition */ |
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if (addr < MAX_REG_OFFSET) { |
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tmp = getreg(child, addr); |
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} |
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else if ((addr >= offsetof(struct user, u_debugreg[0])) && |
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(addr <= offsetof(struct user, u_debugreg[7]))) { |
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addr -= offsetof(struct user, u_debugreg[0]); |
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addr = addr >> 2; |
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tmp = child->thread.arch.debugregs[addr]; |
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} |
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return put_user(tmp, (unsigned long __user *) data); |
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} |
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static int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
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{ |
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int err, n, cpu = task_cpu(child); |
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struct user_i387_struct fpregs; |
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err = save_i387_registers(userspace_pid[cpu], |
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(unsigned long *) &fpregs); |
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if (err) |
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return err; |
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n = copy_to_user(buf, &fpregs, sizeof(fpregs)); |
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if(n > 0) |
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return -EFAULT; |
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return n; |
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} |
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static int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child) |
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{ |
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int n, cpu = task_cpu(child); |
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struct user_i387_struct fpregs; |
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n = copy_from_user(&fpregs, buf, sizeof(fpregs)); |
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if (n > 0) |
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return -EFAULT; |
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return restore_i387_registers(userspace_pid[cpu], |
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(unsigned long *) &fpregs); |
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} |
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static int get_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child) |
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{ |
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int err, n, cpu = task_cpu(child); |
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struct user_fxsr_struct fpregs; |
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err = save_fpx_registers(userspace_pid[cpu], (unsigned long *) &fpregs); |
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if (err) |
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return err; |
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n = copy_to_user(buf, &fpregs, sizeof(fpregs)); |
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if(n > 0) |
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return -EFAULT; |
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return n; |
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} |
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static int set_fpxregs(struct user_fxsr_struct __user *buf, struct task_struct *child) |
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{ |
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int n, cpu = task_cpu(child); |
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struct user_fxsr_struct fpregs; |
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n = copy_from_user(&fpregs, buf, sizeof(fpregs)); |
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if (n > 0) |
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return -EFAULT; |
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return restore_fpx_registers(userspace_pid[cpu], |
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(unsigned long *) &fpregs); |
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} |
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long subarch_ptrace(struct task_struct *child, long request, |
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unsigned long addr, unsigned long data) |
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{ |
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int ret = -EIO; |
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void __user *datap = (void __user *) data; |
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switch (request) { |
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case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
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ret = get_fpregs(datap, child); |
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break; |
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case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
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ret = set_fpregs(datap, child); |
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break; |
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case PTRACE_GETFPXREGS: /* Get the child FPU state. */ |
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ret = get_fpxregs(datap, child); |
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break; |
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case PTRACE_SETFPXREGS: /* Set the child FPU state. */ |
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ret = set_fpxregs(datap, child); |
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break; |
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default: |
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ret = -EIO; |
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} |
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return ret; |
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}
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