arch/um/sys-x86_64/ptrace.c

   1 /*
   2  * Copyright 2003 PathScale, Inc.
   3  *
   4  * Licensed under the GPL
   5  */
   6
   7 #define __FRAME_OFFSETS
   8 #include <asm/ptrace.h>
   9 #include <linux/sched.h>
  10 #include <linux/errno.h>
  11 #include <asm/uaccess.h>
  12 #include <asm/elf.h>
  13
  14 /* XXX x86_64 */
  15 unsigned long not_ss;
  16 unsigned long not_ds;
  17 unsigned long not_es;
  18
  19 #define SC_SS(r) (not_ss)
  20 #define SC_DS(r) (not_ds)
  21 #define SC_ES(r) (not_es)
  22
  23 /* determines which flags the user has access to. */
  24 /* 1 = access 0 = no access */
  25 #define FLAG_MASK 0x44dd5UL
  26
  27 int putreg(struct task_struct *child, int regno, unsigned long value)
  28 {
  29         unsigned long tmp;
  30
  31 #ifdef TIF_IA32
  32         /* Some code in the 64bit emulation may not be 64bit clean.
  33            Don't take any chances. */
  34         if (test_tsk_thread_flag(child, TIF_IA32))
  35                 value &= 0xffffffff;
  36 #endif
  37         switch (regno){
  38         case FS:
  39         case GS:
  40         case DS:
  41         case ES:
  42         case SS:
  43         case CS:
  44                 if (value && (value & 3) != 3)
  45                         return -EIO;
  46                 value &= 0xffff;
  47                 break;
  48
  49         case FS_BASE:
  50         case GS_BASE:
  51                 if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
  52                         return -EIO;
  53                 break;
  54
  55         case EFLAGS:
  56                 value &= FLAG_MASK;
  57                 tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK;
  58                 value |= tmp;
  59                 break;
  60         }
  61
  62         PT_REGS_SET(&child->thread.regs, regno, value);
  63         return 0;
  64 }
  65
  66 int poke_user(struct task_struct *child, long addr, long data)
  67 {
  68         if ((addr & 3) || addr < 0)
  69                 return -EIO;
  70
  71         if (addr < MAX_REG_OFFSET)
  72                 return putreg(child, addr, data);
  73
  74 #if 0 /* Need x86_64 debugregs handling */
  75         else if((addr >= offsetof(struct user, u_debugreg[0])) &&
  76                 (addr <= offsetof(struct user, u_debugreg[7]))){
  77                 addr -= offsetof(struct user, u_debugreg[0]);
  78                 addr = addr >> 2;
  79                 if((addr == 4) || (addr == 5)) return -EIO;
  80                 child->thread.arch.debugregs[addr] = data;
  81                 return 0;
  82         }
  83 #endif
  84         return -EIO;
  85 }
  86
  87 unsigned long getreg(struct task_struct *child, int regno)
  88 {
  89         unsigned long retval = ~0UL;
  90         switch (regno) {
  91         case FS:
  92         case GS:
  93         case DS:
  94         case ES:
  95         case SS:
  96         case CS:
  97                 retval = 0xffff;
  98                 /* fall through */
  99         default:
 100                 retval &= PT_REG(&child->thread.regs, regno);
 101 #ifdef TIF_IA32
 102                 if (test_tsk_thread_flag(child, TIF_IA32))
 103                         retval &= 0xffffffff;
 104 #endif
 105         }
 106         return retval;
 107 }
 108
 109 int peek_user(struct task_struct *child, long addr, long data)
 110 {
 111         /* read the word at location addr in the USER area. */
 112         unsigned long tmp;
 113
 114         if ((addr & 3) || addr < 0)
 115                 return -EIO;
 116
 117         tmp = 0;  /* Default return condition */
 118         if(addr < MAX_REG_OFFSET){
 119                 tmp = getreg(child, addr);
 120         }
 121 #if 0 /* Need x86_64 debugregs handling */
 122         else if((addr >= offsetof(struct user, u_debugreg[0])) &&
 123                 (addr <= offsetof(struct user, u_debugreg[7]))){
 124                 addr -= offsetof(struct user, u_debugreg[0]);
 125                 addr = addr >> 2;
 126                 tmp = child->thread.arch.debugregs[addr];
 127         }
 128 #endif
 129         return put_user(tmp, (unsigned long *) data);
 130 }
 131
 132 void arch_switch(void)
 133 {
 134 /* XXX
 135         printk("arch_switch\n");
 136 */
 137 }
 138
 139 int is_syscall(unsigned long addr)
 140 {
 141         panic("is_syscall");
 142 }
 143
 144 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
 145 {
 146         panic("dump_fpu");
 147         return(1);
 148 }
 149
 150 int get_fpregs(unsigned long buf, struct task_struct *child)
 151 {
 152         panic("get_fpregs");
 153         return(0);
 154 }
 155
 156 int set_fpregs(unsigned long buf, struct task_struct *child)
 157 {
 158         panic("set_fpregs");
 159         return(0);
 160 }
 161
 162 int get_fpxregs(unsigned long buf, struct task_struct *tsk)
 163 {
 164         panic("get_fpxregs");
 165         return(0);
 166 }
 167
 168 int set_fpxregs(unsigned long buf, struct task_struct *tsk)
 169 {
 170         panic("set_fxpregs");
 171         return(0);
 172 }
 173
 174 /*
 175  * Overrides for Emacs so that we follow Linus's tabbing style.
 176  * Emacs will notice this stuff at the end of the file and automatically
 177  * adjust the settings for this buffer only.  This must remain at the end
 178  * of the file.
 179  * ---------------------------------------------------------------------------
 180  * Local variables:
 181  * c-file-style: "linux"
 182  * End:
 183  */