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Ole André Vadla Ravnås
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169c65d57e
51358 changed files with 23120455 additions and 0 deletions
271
arch/x86/um/ptrace_64.c
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271
arch/x86/um/ptrace_64.c
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/*
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* Copyright 2003 PathScale, Inc.
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* Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*
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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/errno.h>
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#define __FRAME_OFFSETS
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#include <asm/ptrace.h>
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#include <asm/uaccess.h>
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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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*/
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#define FLAG_MASK 0x44dd5UL
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static const int reg_offsets[] =
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{
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[R8 >> 3] = HOST_R8,
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[R9 >> 3] = HOST_R9,
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[R10 >> 3] = HOST_R10,
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[R11 >> 3] = HOST_R11,
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[R12 >> 3] = HOST_R12,
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[R13 >> 3] = HOST_R13,
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[R14 >> 3] = HOST_R14,
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[R15 >> 3] = HOST_R15,
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[RIP >> 3] = HOST_IP,
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[RSP >> 3] = HOST_SP,
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[RAX >> 3] = HOST_AX,
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[RBX >> 3] = HOST_BX,
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[RCX >> 3] = HOST_CX,
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[RDX >> 3] = HOST_DX,
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[RSI >> 3] = HOST_SI,
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[RDI >> 3] = HOST_DI,
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[RBP >> 3] = HOST_BP,
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[CS >> 3] = HOST_CS,
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[SS >> 3] = HOST_SS,
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[FS_BASE >> 3] = HOST_FS_BASE,
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[GS_BASE >> 3] = HOST_GS_BASE,
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[DS >> 3] = HOST_DS,
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[ES >> 3] = HOST_ES,
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[FS >> 3] = HOST_FS,
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[GS >> 3] = HOST_GS,
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[EFLAGS >> 3] = HOST_EFLAGS,
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[ORIG_RAX >> 3] = 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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#ifdef TIF_IA32
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/*
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* Some code in the 64bit emulation may not be 64bit clean.
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* Don't take any chances.
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*/
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if (test_tsk_thread_flag(child, TIF_IA32))
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value &= 0xffffffff;
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#endif
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switch (regno) {
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case R8:
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case R9:
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case R10:
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case R11:
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case R12:
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case R13:
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case R14:
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case R15:
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case RIP:
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case RSP:
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case RAX:
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case RBX:
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case RCX:
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case RDX:
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case RSI:
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case RDI:
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case RBP:
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case ORIG_RAX:
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break;
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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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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 FS_BASE:
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case GS_BASE:
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if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
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return -EIO;
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break;
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case EFLAGS:
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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 >> 3]] = 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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#ifdef TIF_IA32
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if (test_tsk_thread_flag(child, TIF_IA32))
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mask = 0xffffffff;
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#endif
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switch (regno) {
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case R8:
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case R9:
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case R10:
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case R11:
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case R12:
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case R13:
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case R14:
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case R15:
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case RIP:
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case RSP:
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case RAX:
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case RBX:
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case RCX:
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case RDX:
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case RSI:
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case RDI:
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case RBP:
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case ORIG_RAX:
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case EFLAGS:
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case FS_BASE:
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case GS_BASE:
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break;
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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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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 >> 3]];
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}
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int peek_user(struct task_struct *child, long addr, long data)
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{
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/* read the word at location addr in the USER area. */
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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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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 *) data);
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}
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/* XXX Mostly copied from sys-i386 */
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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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/*
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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("is_syscall : failed to read instruction from "
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"0x%lx\n", addr);
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return 1;
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}
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}
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/* sysenter */
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return instr == 0x050f;
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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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long fpregs[HOST_FP_SIZE];
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BUG_ON(sizeof(*buf) != sizeof(fpregs));
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err = save_fp_registers(userspace_pid[cpu], 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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long fpregs[HOST_FP_SIZE];
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BUG_ON(sizeof(*buf) != sizeof(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], 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_ARCH_PRCTL:
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/* XXX Calls ptrace on the host - needs some SMP thinking */
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ret = arch_prctl(child, data, (void __user *) addr);
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break;
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}
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return ret;
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}
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