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-rw-r--r--arch/um/sys-i386/ptrace.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c
new file mode 100644
index 000000000000..e470d28cdf84
--- /dev/null
+++ b/arch/um/sys-i386/ptrace.c
@@ -0,0 +1,369 @@
1/*
2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
4 */
5
6#include <linux/config.h>
7#include <linux/compiler.h>
8#include "linux/sched.h"
9#include "asm/elf.h"
10#include "asm/ptrace.h"
11#include "asm/uaccess.h"
12#include "asm/unistd.h"
13#include "sysdep/ptrace.h"
14#include "sysdep/sigcontext.h"
15#include "sysdep/sc.h"
16
17void arch_switch(void)
18{
19 update_debugregs(current->thread.arch.debugregs_seq);
20}
21
22int is_syscall(unsigned long addr)
23{
24 unsigned short instr;
25 int n;
26
27 n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
28 if(n){
29 printk("is_syscall : failed to read instruction from 0x%lx\n",
30 addr);
31 return(0);
32 }
33 /* int 0x80 or sysenter */
34 return((instr == 0x80cd) || (instr == 0x340f));
35}
36
37/* determines which flags the user has access to. */
38/* 1 = access 0 = no access */
39#define FLAG_MASK 0x00044dd5
40
41int putreg(struct task_struct *child, int regno, unsigned long value)
42{
43 regno >>= 2;
44 switch (regno) {
45 case FS:
46 if (value && (value & 3) != 3)
47 return -EIO;
48 PT_REGS_FS(&child->thread.regs) = value;
49 return 0;
50 case GS:
51 if (value && (value & 3) != 3)
52 return -EIO;
53 PT_REGS_GS(&child->thread.regs) = value;
54 return 0;
55 case DS:
56 case ES:
57 if (value && (value & 3) != 3)
58 return -EIO;
59 value &= 0xffff;
60 break;
61 case SS:
62 case CS:
63 if ((value & 3) != 3)
64 return -EIO;
65 value &= 0xffff;
66 break;
67 case EFL:
68 value &= FLAG_MASK;
69 value |= PT_REGS_EFLAGS(&child->thread.regs);
70 break;
71 }
72 PT_REGS_SET(&child->thread.regs, regno, value);
73 return 0;
74}
75
76unsigned long getreg(struct task_struct *child, int regno)
77{
78 unsigned long retval = ~0UL;
79
80 regno >>= 2;
81 switch (regno) {
82 case FS:
83 case GS:
84 case DS:
85 case ES:
86 case SS:
87 case CS:
88 retval = 0xffff;
89 /* fall through */
90 default:
91 retval &= PT_REG(&child->thread.regs, regno);
92 }
93 return retval;
94}
95
96struct i387_fxsave_struct {
97 unsigned short cwd;
98 unsigned short swd;
99 unsigned short twd;
100 unsigned short fop;
101 long fip;
102 long fcs;
103 long foo;
104 long fos;
105 long mxcsr;
106 long reserved;
107 long st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
108 long xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
109 long padding[56];
110};
111
112/*
113 * FPU tag word conversions.
114 */
115
116static inline unsigned short twd_i387_to_fxsr( unsigned short twd )
117{
118 unsigned int tmp; /* to avoid 16 bit prefixes in the code */
119
120 /* Transform each pair of bits into 01 (valid) or 00 (empty) */
121 tmp = ~twd;
122 tmp = (tmp | (tmp>>1)) & 0x5555; /* 0V0V0V0V0V0V0V0V */
123 /* and move the valid bits to the lower byte. */
124 tmp = (tmp | (tmp >> 1)) & 0x3333; /* 00VV00VV00VV00VV */
125 tmp = (tmp | (tmp >> 2)) & 0x0f0f; /* 0000VVVV0000VVVV */
126 tmp = (tmp | (tmp >> 4)) & 0x00ff; /* 00000000VVVVVVVV */
127 return tmp;
128}
129
130static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave )
131{
132 struct _fpxreg *st = NULL;
133 unsigned long twd = (unsigned long) fxsave->twd;
134 unsigned long tag;
135 unsigned long ret = 0xffff0000;
136 int i;
137
138#define FPREG_ADDR(f, n) ((char *)&(f)->st_space + (n) * 16);
139
140 for ( i = 0 ; i < 8 ; i++ ) {
141 if ( twd & 0x1 ) {
142 st = (struct _fpxreg *) FPREG_ADDR( fxsave, i );
143
144 switch ( st->exponent & 0x7fff ) {
145 case 0x7fff:
146 tag = 2; /* Special */
147 break;
148 case 0x0000:
149 if ( !st->significand[0] &&
150 !st->significand[1] &&
151 !st->significand[2] &&
152 !st->significand[3] ) {
153 tag = 1; /* Zero */
154 } else {
155 tag = 2; /* Special */
156 }
157 break;
158 default:
159 if ( st->significand[3] & 0x8000 ) {
160 tag = 0; /* Valid */
161 } else {
162 tag = 2; /* Special */
163 }
164 break;
165 }
166 } else {
167 tag = 3; /* Empty */
168 }
169 ret |= (tag << (2 * i));
170 twd = twd >> 1;
171 }
172 return ret;
173}
174
175/*
176 * FXSR floating point environment conversions.
177 */
178
179#ifdef CONFIG_MODE_TT
180static inline int convert_fxsr_to_user_tt(struct _fpstate __user *buf,
181 struct pt_regs *regs)
182{
183 struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
184 unsigned long env[7];
185 struct _fpreg __user *to;
186 struct _fpxreg *from;
187 int i;
188
189 env[0] = (unsigned long)fxsave->cwd | 0xffff0000;
190 env[1] = (unsigned long)fxsave->swd | 0xffff0000;
191 env[2] = twd_fxsr_to_i387(fxsave);
192 env[3] = fxsave->fip;
193 env[4] = fxsave->fcs | ((unsigned long)fxsave->fop << 16);
194 env[5] = fxsave->foo;
195 env[6] = fxsave->fos;
196
197 if ( __copy_to_user( buf, env, 7 * sizeof(unsigned long) ) )
198 return 1;
199
200 to = &buf->_st[0];
201 from = (struct _fpxreg *) &fxsave->st_space[0];
202 for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
203 if ( __copy_to_user( to, from, sizeof(*to) ) )
204 return 1;
205 }
206 return 0;
207}
208#endif
209
210static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
211 struct pt_regs *regs)
212{
213 return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
214}
215
216#ifdef CONFIG_MODE_TT
217static inline int convert_fxsr_from_user_tt(struct pt_regs *regs,
218 struct _fpstate __user *buf)
219{
220 struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
221 unsigned long env[7];
222 struct _fpxreg *to;
223 struct _fpreg __user *from;
224 int i;
225
226 if ( __copy_from_user( env, buf, 7 * sizeof(long) ) )
227 return 1;
228
229 fxsave->cwd = (unsigned short)(env[0] & 0xffff);
230 fxsave->swd = (unsigned short)(env[1] & 0xffff);
231 fxsave->twd = twd_i387_to_fxsr((unsigned short)(env[2] & 0xffff));
232 fxsave->fip = env[3];
233 fxsave->fop = (unsigned short)((env[4] & 0xffff0000) >> 16);
234 fxsave->fcs = (env[4] & 0xffff);
235 fxsave->foo = env[5];
236 fxsave->fos = env[6];
237
238 to = (struct _fpxreg *) &fxsave->st_space[0];
239 from = &buf->_st[0];
240 for ( i = 0 ; i < 8 ; i++, to++, from++ ) {
241 if ( __copy_from_user( to, from, sizeof(*from) ) )
242 return 1;
243 }
244 return 0;
245}
246#endif
247
248static inline int convert_fxsr_from_user(struct pt_regs *regs,
249 struct _fpstate __user *buf)
250{
251 return(CHOOSE_MODE(convert_fxsr_from_user_tt(regs, buf), 0));
252}
253
254int get_fpregs(unsigned long buf, struct task_struct *child)
255{
256 int err;
257
258 err = convert_fxsr_to_user((struct _fpstate __user *) buf,
259 &child->thread.regs);
260 if(err) return(-EFAULT);
261 else return(0);
262}
263
264int set_fpregs(unsigned long buf, struct task_struct *child)
265{
266 int err;
267
268 err = convert_fxsr_from_user(&child->thread.regs,
269 (struct _fpstate __user *) buf);
270 if(err) return(-EFAULT);
271 else return(0);
272}
273
274#ifdef CONFIG_MODE_TT
275int get_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
276{
277 struct pt_regs *regs = &tsk->thread.regs;
278 struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
279 int err;
280
281 err = __copy_to_user((void __user *) buf, fxsave,
282 sizeof(struct user_fxsr_struct));
283 if(err) return -EFAULT;
284 else return 0;
285}
286#endif
287
288int get_fpxregs(unsigned long buf, struct task_struct *tsk)
289{
290 return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
291}
292
293#ifdef CONFIG_MODE_TT
294int set_fpxregs_tt(unsigned long buf, struct task_struct *tsk)
295{
296 struct pt_regs *regs = &tsk->thread.regs;
297 struct i387_fxsave_struct *fxsave = SC_FXSR_ENV(PT_REGS_SC(regs));
298 int err;
299
300 err = __copy_from_user(fxsave, (void __user *) buf,
301 sizeof(struct user_fxsr_struct) );
302 if(err) return -EFAULT;
303 else return 0;
304}
305#endif
306
307int set_fpxregs(unsigned long buf, struct task_struct *tsk)
308{
309 return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
310}
311
312#ifdef notdef
313int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
314{
315 fpu->cwd = (((SC_FP_CW(PT_REGS_SC(regs)) & 0xffff) << 16) |
316 (SC_FP_SW(PT_REGS_SC(regs)) & 0xffff));
317 fpu->swd = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
318 fpu->twd = SC_FP_IPOFF(PT_REGS_SC(regs));
319 fpu->fip = SC_FP_CSSEL(PT_REGS_SC(regs)) & 0xffff;
320 fpu->fcs = SC_FP_DATAOFF(PT_REGS_SC(regs));
321 fpu->foo = SC_FP_DATASEL(PT_REGS_SC(regs));
322 fpu->fos = 0;
323 memcpy(fpu->st_space, (void *) SC_FP_ST(PT_REGS_SC(regs)),
324 sizeof(fpu->st_space));
325 return(1);
326}
327#endif
328
329#ifdef CONFIG_MODE_TT
330static inline void copy_fpu_fxsave_tt(struct pt_regs *regs,
331 struct user_i387_struct *buf)
332{
333 struct i387_fxsave_struct *fpu = SC_FXSR_ENV(PT_REGS_SC(regs));
334 unsigned short *to;
335 unsigned short *from;
336 int i;
337
338 memcpy( buf, fpu, 7 * sizeof(long) );
339
340 to = (unsigned short *) &buf->st_space[0];
341 from = (unsigned short *) &fpu->st_space[0];
342 for ( i = 0 ; i < 8 ; i++, to += 5, from += 8 ) {
343 memcpy( to, from, 5 * sizeof(unsigned short) );
344 }
345}
346#endif
347
348static inline void copy_fpu_fxsave(struct pt_regs *regs,
349 struct user_i387_struct *buf)
350{
351 (void) CHOOSE_MODE(copy_fpu_fxsave_tt(regs, buf), 0);
352}
353
354int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
355{
356 copy_fpu_fxsave(regs, (struct user_i387_struct *) fpu);
357 return(1);
358}
359
360/*
361 * Overrides for Emacs so that we follow Linus's tabbing style.
362 * Emacs will notice this stuff at the end of the file and automatically
363 * adjust the settings for this buffer only. This must remain at the end
364 * of the file.
365 * ---------------------------------------------------------------------------
366 * Local variables:
367 * c-file-style: "linux"
368 * End:
369 */
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