forked from luck/tmp_suning_uos_patched
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
380 lines
8.7 KiB
C
380 lines
8.7 KiB
C
/*
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* 32bit ptrace for x86-64.
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*
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* Copyright 2001,2002 Andi Kleen, SuSE Labs.
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* Some parts copied from arch/i386/kernel/ptrace.c. See that file for earlier
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* copyright.
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*
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* This allows to access 64bit processes too; but there is no way to see the extended
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* register contents.
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*
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* $Id: ptrace32.c,v 1.16 2003/03/14 16:06:35 ak Exp $
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*/
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/syscalls.h>
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#include <linux/unistd.h>
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#include <linux/mm.h>
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#include <linux/ptrace.h>
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#include <asm/ptrace.h>
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#include <asm/compat.h>
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#include <asm/uaccess.h>
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#include <asm/user32.h>
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#include <asm/user.h>
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#include <asm/errno.h>
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#include <asm/debugreg.h>
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#include <asm/i387.h>
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#include <asm/fpu32.h>
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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 0x44dd5UL
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#define R32(l,q) \
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case offsetof(struct user32, regs.l): stack[offsetof(struct pt_regs, q)/8] = val; break
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static int putreg32(struct task_struct *child, unsigned regno, u32 val)
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{
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int i;
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__u64 *stack = (__u64 *)(child->thread.rsp0 - sizeof(struct pt_regs));
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switch (regno) {
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case offsetof(struct user32, regs.fs):
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if (val && (val & 3) != 3) return -EIO;
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child->thread.fs = val & 0xffff;
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break;
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case offsetof(struct user32, regs.gs):
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if (val && (val & 3) != 3) return -EIO;
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child->thread.gs = val & 0xffff;
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break;
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case offsetof(struct user32, regs.ds):
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if (val && (val & 3) != 3) return -EIO;
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child->thread.ds = val & 0xffff;
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break;
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case offsetof(struct user32, regs.es):
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child->thread.es = val & 0xffff;
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break;
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case offsetof(struct user32, regs.ss):
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if ((val & 3) != 3) return -EIO;
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stack[offsetof(struct pt_regs, ss)/8] = val & 0xffff;
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break;
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case offsetof(struct user32, regs.cs):
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if ((val & 3) != 3) return -EIO;
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stack[offsetof(struct pt_regs, cs)/8] = val & 0xffff;
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break;
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R32(ebx, rbx);
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R32(ecx, rcx);
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R32(edx, rdx);
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R32(edi, rdi);
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R32(esi, rsi);
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R32(ebp, rbp);
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R32(eax, rax);
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R32(orig_eax, orig_rax);
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R32(eip, rip);
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R32(esp, rsp);
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case offsetof(struct user32, regs.eflags): {
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__u64 *flags = &stack[offsetof(struct pt_regs, eflags)/8];
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val &= FLAG_MASK;
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*flags = val | (*flags & ~FLAG_MASK);
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break;
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}
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case offsetof(struct user32, u_debugreg[4]):
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case offsetof(struct user32, u_debugreg[5]):
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return -EIO;
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case offsetof(struct user32, u_debugreg[0]):
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child->thread.debugreg0 = val;
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break;
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case offsetof(struct user32, u_debugreg[1]):
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child->thread.debugreg1 = val;
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break;
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case offsetof(struct user32, u_debugreg[2]):
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child->thread.debugreg2 = val;
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break;
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case offsetof(struct user32, u_debugreg[3]):
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child->thread.debugreg3 = val;
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break;
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case offsetof(struct user32, u_debugreg[6]):
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child->thread.debugreg6 = val;
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break;
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case offsetof(struct user32, u_debugreg[7]):
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val &= ~DR_CONTROL_RESERVED;
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/* See arch/i386/kernel/ptrace.c for an explanation of
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* this awkward check.*/
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for(i=0; i<4; i++)
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if ((0x5454 >> ((val >> (16 + 4*i)) & 0xf)) & 1)
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return -EIO;
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child->thread.debugreg7 = val;
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break;
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default:
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if (regno > sizeof(struct user32) || (regno & 3))
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return -EIO;
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/* Other dummy fields in the virtual user structure are ignored */
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break;
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}
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return 0;
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}
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#undef R32
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#define R32(l,q) \
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case offsetof(struct user32, regs.l): *val = stack[offsetof(struct pt_regs, q)/8]; break
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static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
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{
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__u64 *stack = (__u64 *)(child->thread.rsp0 - sizeof(struct pt_regs));
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switch (regno) {
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case offsetof(struct user32, regs.fs):
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*val = child->thread.fs;
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break;
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case offsetof(struct user32, regs.gs):
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*val = child->thread.gs;
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break;
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case offsetof(struct user32, regs.ds):
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*val = child->thread.ds;
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break;
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case offsetof(struct user32, regs.es):
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*val = child->thread.es;
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break;
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R32(cs, cs);
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R32(ss, ss);
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R32(ebx, rbx);
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R32(ecx, rcx);
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R32(edx, rdx);
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R32(edi, rdi);
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R32(esi, rsi);
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R32(ebp, rbp);
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R32(eax, rax);
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R32(orig_eax, orig_rax);
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R32(eip, rip);
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R32(eflags, eflags);
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R32(esp, rsp);
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case offsetof(struct user32, u_debugreg[0]):
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*val = child->thread.debugreg0;
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break;
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case offsetof(struct user32, u_debugreg[1]):
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*val = child->thread.debugreg1;
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break;
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case offsetof(struct user32, u_debugreg[2]):
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*val = child->thread.debugreg2;
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break;
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case offsetof(struct user32, u_debugreg[3]):
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*val = child->thread.debugreg3;
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break;
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case offsetof(struct user32, u_debugreg[6]):
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*val = child->thread.debugreg6;
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break;
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case offsetof(struct user32, u_debugreg[7]):
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*val = child->thread.debugreg7;
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break;
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default:
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if (regno > sizeof(struct user32) || (regno & 3))
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return -EIO;
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/* Other dummy fields in the virtual user structure are ignored */
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*val = 0;
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break;
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}
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return 0;
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}
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#undef R32
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static struct task_struct *find_target(int request, int pid, int *err)
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{
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struct task_struct *child;
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*err = -EPERM;
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if (pid == 1)
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return NULL;
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*err = -ESRCH;
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read_lock(&tasklist_lock);
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child = find_task_by_pid(pid);
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if (child)
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get_task_struct(child);
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read_unlock(&tasklist_lock);
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if (child) {
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*err = -EPERM;
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if (child->pid == 1)
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goto out;
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*err = ptrace_check_attach(child, request == PTRACE_KILL);
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if (*err < 0)
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goto out;
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return child;
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}
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out:
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if (child)
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put_task_struct(child);
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return NULL;
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}
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asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
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{
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struct task_struct *child;
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struct pt_regs *childregs;
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void __user *datap = compat_ptr(data);
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int ret;
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__u32 val;
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switch (request) {
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default:
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return sys_ptrace(request, pid, addr, data);
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case PTRACE_PEEKTEXT:
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case PTRACE_PEEKDATA:
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case PTRACE_POKEDATA:
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case PTRACE_POKETEXT:
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case PTRACE_POKEUSR:
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case PTRACE_PEEKUSR:
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case PTRACE_GETREGS:
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case PTRACE_SETREGS:
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case PTRACE_SETFPREGS:
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case PTRACE_GETFPREGS:
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case PTRACE_SETFPXREGS:
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case PTRACE_GETFPXREGS:
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case PTRACE_GETEVENTMSG:
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break;
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}
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child = find_target(request, pid, &ret);
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if (!child)
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return ret;
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childregs = (struct pt_regs *)(child->thread.rsp0 - sizeof(struct pt_regs));
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switch (request) {
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case PTRACE_PEEKDATA:
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case PTRACE_PEEKTEXT:
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ret = 0;
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if (access_process_vm(child, addr, &val, sizeof(u32), 0)!=sizeof(u32))
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ret = -EIO;
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else
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ret = put_user(val, (unsigned int __user *)datap);
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break;
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case PTRACE_POKEDATA:
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case PTRACE_POKETEXT:
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ret = 0;
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if (access_process_vm(child, addr, &data, sizeof(u32), 1)!=sizeof(u32))
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ret = -EIO;
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break;
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case PTRACE_PEEKUSR:
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ret = getreg32(child, addr, &val);
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if (ret == 0)
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ret = put_user(val, (__u32 __user *)datap);
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break;
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case PTRACE_POKEUSR:
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ret = putreg32(child, addr, data);
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break;
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case PTRACE_GETREGS: { /* Get all gp regs from the child. */
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int i;
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if (!access_ok(VERIFY_WRITE, datap, 16*4)) {
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ret = -EIO;
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break;
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}
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ret = 0;
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for ( i = 0; i <= 16*4 ; i += sizeof(__u32) ) {
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getreg32(child, i, &val);
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ret |= __put_user(val,(u32 __user *)datap);
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datap += sizeof(u32);
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}
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break;
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}
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case PTRACE_SETREGS: { /* Set all gp regs in the child. */
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unsigned long tmp;
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int i;
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if (!access_ok(VERIFY_READ, datap, 16*4)) {
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ret = -EIO;
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break;
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}
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ret = 0;
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for ( i = 0; i <= 16*4; i += sizeof(u32) ) {
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ret |= __get_user(tmp, (u32 __user *)datap);
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putreg32(child, i, tmp);
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datap += sizeof(u32);
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}
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break;
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}
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case PTRACE_GETFPREGS:
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ret = -EIO;
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if (!access_ok(VERIFY_READ, compat_ptr(data),
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sizeof(struct user_i387_struct)))
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break;
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save_i387_ia32(child, datap, childregs, 1);
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ret = 0;
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break;
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case PTRACE_SETFPREGS:
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ret = -EIO;
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if (!access_ok(VERIFY_WRITE, datap,
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sizeof(struct user_i387_struct)))
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break;
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ret = 0;
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/* don't check EFAULT to be bug-to-bug compatible to i386 */
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restore_i387_ia32(child, datap, 1);
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break;
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case PTRACE_GETFPXREGS: {
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struct user32_fxsr_struct __user *u = datap;
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init_fpu(child);
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ret = -EIO;
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if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
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break;
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ret = -EFAULT;
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if (__copy_to_user(u, &child->thread.i387.fxsave, sizeof(*u)))
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break;
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ret = __put_user(childregs->cs, &u->fcs);
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ret |= __put_user(child->thread.ds, &u->fos);
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break;
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}
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case PTRACE_SETFPXREGS: {
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struct user32_fxsr_struct __user *u = datap;
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unlazy_fpu(child);
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ret = -EIO;
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if (!access_ok(VERIFY_READ, u, sizeof(*u)))
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break;
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/* no checking to be bug-to-bug compatible with i386 */
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__copy_from_user(&child->thread.i387.fxsave, u, sizeof(*u));
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set_stopped_child_used_math(child);
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child->thread.i387.fxsave.mxcsr &= mxcsr_feature_mask;
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ret = 0;
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break;
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}
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case PTRACE_GETEVENTMSG:
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ret = put_user(child->ptrace_message,(unsigned int __user *)compat_ptr(data));
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break;
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default:
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ret = -EINVAL;
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break;
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}
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put_task_struct(child);
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return ret;
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}
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