da028d5e54
Don't include ptrace uapi stuff in arch headers, it will pollute the kernel namespace and conflict with existing stuff. In this case it fixes clashes with common names like R8. Signed-off-by: Richard Weinberger <richard@nod.at>
275 lines
6 KiB
C
275 lines
6 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 <asm/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), 0);
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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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};
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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 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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case ORIG_EAX:
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child->thread.regs.regs.syscall = 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 ORIG_EAX:
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return child->thread.regs.regs.syscall;
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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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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 = ((struct thread_info *) child->stack)->cpu;
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struct user_i387_struct fpregs;
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err = save_fp_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_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
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{
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int n, cpu = ((struct thread_info *) child->stack)->cpu;
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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_fp_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 = ((struct thread_info *) child->stack)->cpu;
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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 = ((struct thread_info *) child->stack)->cpu;
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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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