279 lines
6.0 KiB
C
279 lines
6.0 KiB
C
/*
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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 <registers.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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