aboutsummaryrefslogtreecommitdiff
path: root/arch/ia64/ia32/ia32priv.h
blob: e3e9290e3ff2f433f649daa418a2c35a0c00ed5e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
#ifndef _ASM_IA64_IA32_PRIV_H
#define _ASM_IA64_IA32_PRIV_H

#include <linux/config.h>

#include <asm/ia32.h>

#ifdef CONFIG_IA32_SUPPORT

#include <linux/binfmts.h>
#include <linux/compat.h>
#include <linux/rbtree.h>

#include <asm/processor.h>

/*
 * 32 bit structures for IA32 support.
 */

#define IA32_PAGE_SIZE		(1UL << IA32_PAGE_SHIFT)
#define IA32_PAGE_MASK		(~(IA32_PAGE_SIZE - 1))
#define IA32_PAGE_ALIGN(addr)	(((addr) + IA32_PAGE_SIZE - 1) & IA32_PAGE_MASK)
#define IA32_CLOCKS_PER_SEC	100	/* Cast in stone for IA32 Linux */

/*
 * partially mapped pages provide precise accounting of which 4k sub pages
 * are mapped and which ones are not, thereby improving IA-32 compatibility.
 */
struct partial_page {
	struct partial_page	*next; /* linked list, sorted by address */
	struct rb_node		pp_rb;
	/* 64K is the largest "normal" page supported by ia64 ABI. So 4K*32
	 * should suffice.*/
	unsigned int		bitmap;
	unsigned int		base;
};

struct partial_page_list {
	struct partial_page	*pp_head; /* list head, points to the lowest
					   * addressed partial page */
	struct rb_root		ppl_rb;
	struct partial_page	*pp_hint; /* pp_hint->next is the last
					   * accessed partial page */
	atomic_t		pp_count; /* reference count */
};

#if PAGE_SHIFT > IA32_PAGE_SHIFT
struct partial_page_list* ia32_init_pp_list (void);
#else
# define ia32_init_pp_list()	0
#endif

/* sigcontext.h */
/*
 * As documented in the iBCS2 standard..
 *
 * The first part of "struct _fpstate" is just the
 * normal i387 hardware setup, the extra "status"
 * word is used to save the coprocessor status word
 * before entering the handler.
 */
struct _fpreg_ia32 {
       unsigned short significand[4];
       unsigned short exponent;
};

struct _fpxreg_ia32 {
        unsigned short significand[4];
        unsigned short exponent;
        unsigned short padding[3];
};

struct _xmmreg_ia32 {
        unsigned int element[4];
};


struct _fpstate_ia32 {
       unsigned int    cw,
		       sw,
		       tag,
		       ipoff,
		       cssel,
		       dataoff,
		       datasel;
       struct _fpreg_ia32      _st[8];
       unsigned short  status;
       unsigned short  magic;          /* 0xffff = regular FPU data only */

       /* FXSR FPU environment */
       unsigned int         _fxsr_env[6];   /* FXSR FPU env is ignored */
       unsigned int         mxcsr;
       unsigned int         reserved;
       struct _fpxreg_ia32  _fxsr_st[8];    /* FXSR FPU reg data is ignored */
       struct _xmmreg_ia32  _xmm[8];
       unsigned int         padding[56];
};

struct sigcontext_ia32 {
       unsigned short gs, __gsh;
       unsigned short fs, __fsh;
       unsigned short es, __esh;
       unsigned short ds, __dsh;
       unsigned int edi;
       unsigned int esi;
       unsigned int ebp;
       unsigned int esp;
       unsigned int ebx;
       unsigned int edx;
       unsigned int ecx;
       unsigned int eax;
       unsigned int trapno;
       unsigned int err;
       unsigned int eip;
       unsigned short cs, __csh;
       unsigned int eflags;
       unsigned int esp_at_signal;
       unsigned short ss, __ssh;
       unsigned int fpstate;		/* really (struct _fpstate_ia32 *) */
       unsigned int oldmask;
       unsigned int cr2;
};

/* user.h */
/*
 * IA32 (Pentium III/4) FXSR, SSE support
 *
 * Provide support for the GDB 5.0+ PTRACE_{GET|SET}FPXREGS requests for
 * interacting with the FXSR-format floating point environment.  Floating
 * point data can be accessed in the regular format in the usual manner,
 * and both the standard and SIMD floating point data can be accessed via
 * the new ptrace requests.  In either case, changes to the FPU environment
 * will be reflected in the task's state as expected.
 */
struct ia32_user_i387_struct {
	int	cwd;
	int	swd;
	int	twd;
	int	fip;
	int	fcs;
	int	foo;
	int	fos;
	/* 8*10 bytes for each FP-reg = 80 bytes */
	struct _fpreg_ia32 	st_space[8];
};

struct ia32_user_fxsr_struct {
	unsigned short	cwd;
	unsigned short	swd;
	unsigned short	twd;
	unsigned short	fop;
	int	fip;
	int	fcs;
	int	foo;
	int	fos;
	int	mxcsr;
	int	reserved;
	int	st_space[32];	/* 8*16 bytes for each FP-reg = 128 bytes */
	int	xmm_space[32];	/* 8*16 bytes for each XMM-reg = 128 bytes */
	int	padding[56];
};

/* signal.h */
#define IA32_SET_SA_HANDLER(ka,handler,restorer)				\
				((ka)->sa.sa_handler = (__sighandler_t)		\
					(((unsigned long)(restorer) << 32)	\
					 | ((handler) & 0xffffffff)))
#define IA32_SA_HANDLER(ka)	((unsigned long) (ka)->sa.sa_handler & 0xffffffff)
#define IA32_SA_RESTORER(ka)	((unsigned long) (ka)->sa.sa_handler >> 32)

#define __IA32_NR_sigreturn 119
#define __IA32_NR_rt_sigreturn 173

struct sigaction32 {
       unsigned int sa_handler;		/* Really a pointer, but need to deal with 32 bits */
       unsigned int sa_flags;
       unsigned int sa_restorer;	/* Another 32 bit pointer */
       compat_sigset_t sa_mask;		/* A 32 bit mask */
};

struct old_sigaction32 {
       unsigned int  sa_handler;	/* Really a pointer, but need to deal
					     with 32 bits */
       compat_old_sigset_t sa_mask;		/* A 32 bit mask */
       unsigned int sa_flags;
       unsigned int sa_restorer;	/* Another 32 bit pointer */
};

typedef struct sigaltstack_ia32 {
	unsigned int	ss_sp;
	int		ss_flags;
	unsigned int	ss_size;
} stack_ia32_t;

struct ucontext_ia32 {
	unsigned int	  uc_flags;
	unsigned int	  uc_link;
	stack_ia32_t	  uc_stack;
	struct sigcontext_ia32 uc_mcontext;
	sigset_t	  uc_sigmask;	/* mask last for extensibility */
};

struct stat64 {
	unsigned long long	st_dev;
	unsigned char	__pad0[4];
	unsigned int	__st_ino;
	unsigned int	st_mode;
	unsigned int	st_nlink;
	unsigned int	st_uid;
	unsigned int	st_gid;
	unsigned long long	st_rdev;
	unsigned char	__pad3[4];
	unsigned int	st_size_lo;
	unsigned int	st_size_hi;
	unsigned int	st_blksize;
	unsigned int	st_blocks;	/* Number 512-byte blocks allocated. */
	unsigned int	__pad4;		/* future possible st_blocks high bits */
	unsigned int	st_atime;
	unsigned int	st_atime_nsec;
	unsigned int	st_mtime;
	unsigned int	st_mtime_nsec;
	unsigned int	st_ctime;
	unsigned int	st_ctime_nsec;
	unsigned int	st_ino_lo;
	unsigned int	st_ino_hi;
};

typedef struct compat_siginfo {
	int si_signo;
	int si_errno;
	int si_code;

	union {
		int _pad[((128/sizeof(int)) - 3)];

		/* kill() */
		struct {
			unsigned int _pid;	/* sender's pid */
			unsigned int _uid;	/* sender's uid */
		} _kill;

		/* POSIX.1b timers */
		struct {
			compat_timer_t _tid;		/* timer id */
			int _overrun;		/* overrun count */
			char _pad[sizeof(unsigned int) - sizeof(int)];
			compat_sigval_t _sigval;	/* same as below */
			int _sys_private;       /* not to be passed to user */
		} _timer;

		/* POSIX.1b signals */
		struct {
			unsigned int _pid;	/* sender's pid */
			unsigned int _uid;	/* sender's uid */
			compat_sigval_t _sigval;
		} _rt;

		/* SIGCHLD */
		struct {
			unsigned int _pid;	/* which child */
			unsigned int _uid;	/* sender's uid */
			int _status;		/* exit code */
			compat_clock_t _utime;
			compat_clock_t _stime;
		} _sigchld;

		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
		struct {
			unsigned int _addr;	/* faulting insn/memory ref. */
		} _sigfault;

		/* SIGPOLL */
		struct {
			int _band;	/* POLL_IN, POLL_OUT, POLL_MSG */
			int _fd;
		} _sigpoll;
	} _sifields;
} compat_siginfo_t;

struct old_linux32_dirent {
	u32	d_ino;
	u32	d_offset;
	u16	d_namlen;
	char	d_name[1];
};

/*
 * IA-32 ELF specific definitions for IA-64.
 */

#define _ASM_IA64_ELF_H		/* Don't include elf.h */

#include <linux/sched.h>
#include <asm/processor.h>

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) ((x)->e_machine == EM_386)

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_CLASS	ELFCLASS32
#define ELF_DATA	ELFDATA2LSB
#define ELF_ARCH	EM_386

#define IA32_PAGE_OFFSET	0xc0000000
#define IA32_STACK_TOP		IA32_PAGE_OFFSET
#define IA32_GATE_OFFSET	IA32_PAGE_OFFSET
#define IA32_GATE_END		IA32_PAGE_OFFSET + PAGE_SIZE

/*
 * The system segments (GDT, TSS, LDT) have to be mapped below 4GB so the IA-32 engine can
 * access them.
 */
#define IA32_GDT_OFFSET		(IA32_PAGE_OFFSET + PAGE_SIZE)
#define IA32_TSS_OFFSET		(IA32_PAGE_OFFSET + 2*PAGE_SIZE)
#define IA32_LDT_OFFSET		(IA32_PAGE_OFFSET + 3*PAGE_SIZE)

#define ELF_EXEC_PAGESIZE	IA32_PAGE_SIZE

/*
 * This is the location that an ET_DYN program is loaded if exec'ed.
 * Typical use of this is to invoke "./ld.so someprog" to test out a
 * new version of the loader.  We need to make sure that it is out of
 * the way of the program that it will "exec", and that there is
 * sufficient room for the brk.
 */
#define ELF_ET_DYN_BASE		(IA32_PAGE_OFFSET/3 + 0x1000000)

void ia64_elf32_init(struct pt_regs *regs);
#define ELF_PLAT_INIT(_r, load_addr)	ia64_elf32_init(_r)

#define elf_addr_t	u32

/* This macro yields a bitmask that programs can use to figure out
   what instruction set this CPU supports.  */
#define ELF_HWCAP	0

/* This macro yields a string that ld.so will use to load
   implementation specific libraries for optimization.  Not terribly
   relevant until we have real hardware to play with... */
#define ELF_PLATFORM	NULL

#ifdef __KERNEL__
# define SET_PERSONALITY(EX,IBCS2)				\
	(current->personality = (IBCS2) ? PER_SVR4 : PER_LINUX)
#endif

#define IA32_EFLAG	0x200

/*
 * IA-32 ELF specific definitions for IA-64.
 */

#define __USER_CS      0x23
#define __USER_DS      0x2B

/*
 * The per-cpu GDT has 32 entries: see <asm-i386/segment.h>
 */
#define GDT_ENTRIES 32

#define GDT_SIZE	(GDT_ENTRIES * 8)

#define TSS_ENTRY 14
#define LDT_ENTRY	(TSS_ENTRY + 1)

#define IA32_SEGSEL_RPL		(0x3 << 0)
#define IA32_SEGSEL_TI		(0x1 << 2)
#define IA32_SEGSEL_INDEX_SHIFT	3

#define _TSS			((unsigned long) TSS_ENTRY << IA32_SEGSEL_INDEX_SHIFT)
#define _LDT			((unsigned long) LDT_ENTRY << IA32_SEGSEL_INDEX_SHIFT)

#define IA32_SEG_BASE		16
#define IA32_SEG_TYPE		40
#define IA32_SEG_SYS		44
#define IA32_SEG_DPL		45
#define IA32_SEG_P		47
#define IA32_SEG_HIGH_LIMIT	48
#define IA32_SEG_AVL		52
#define IA32_SEG_DB		54
#define IA32_SEG_G		55
#define IA32_SEG_HIGH_BASE	56

#define IA32_SEG_DESCRIPTOR(base, limit, segtype, nonsysseg, dpl, segpresent, avl, segdb, gran)	\
	       (((limit) & 0xffff)								\
		| (((unsigned long) (base) & 0xffffff) << IA32_SEG_BASE)			\
		| ((unsigned long) (segtype) << IA32_SEG_TYPE)					\
		| ((unsigned long) (nonsysseg) << IA32_SEG_SYS)					\
		| ((unsigned long) (dpl) << IA32_SEG_DPL)					\
		| ((unsigned long) (segpresent) << IA32_SEG_P)					\
		| ((((unsigned long) (limit) >> 16) & 0xf) << IA32_SEG_HIGH_LIMIT)		\
		| ((unsigned long) (avl) << IA32_SEG_AVL)					\
		| ((unsigned long) (segdb) << IA32_SEG_DB)					\
		| ((unsigned long) (gran) << IA32_SEG_G)					\
		| ((((unsigned long) (base) >> 24) & 0xff) << IA32_SEG_HIGH_BASE))

#define SEG_LIM		32
#define SEG_TYPE	52
#define SEG_SYS		56
#define SEG_DPL		57
#define SEG_P		59
#define SEG_AVL		60
#define SEG_DB		62
#define SEG_G		63

/* Unscramble an IA-32 segment descriptor into the IA-64 format.  */
#define IA32_SEG_UNSCRAMBLE(sd)									 \
	(   (((sd) >> IA32_SEG_BASE) & 0xffffff) | ((((sd) >> IA32_SEG_HIGH_BASE) & 0xff) << 24) \
	 | ((((sd) & 0xffff) | ((((sd) >> IA32_SEG_HIGH_LIMIT) & 0xf) << 16)) << SEG_LIM)	 \
	 | ((((sd) >> IA32_SEG_TYPE) & 0xf) << SEG_TYPE)					 \
	 | ((((sd) >> IA32_SEG_SYS) & 0x1) << SEG_SYS)						 \
	 | ((((sd) >> IA32_SEG_DPL) & 0x3) << SEG_DPL)						 \
	 | ((((sd) >> IA32_SEG_P) & 0x1) << SEG_P)						 \
	 | ((((sd) >> IA32_SEG_AVL) & 0x1) << SEG_AVL)						 \
	 | ((((sd) >> IA32_SEG_DB) & 0x1) << SEG_DB)						 \
	 | ((((sd) >> IA32_SEG_G) & 0x1) << SEG_G))

#define IA32_IOBASE	0x2000000000000000UL /* Virtual address for I/O space */

#define IA32_CR0	0x80000001	/* Enable PG and PE bits */
#define IA32_CR4	0x600		/* MMXEX and FXSR on */

/*
 *  IA32 floating point control registers starting values
 */

#define IA32_FSR_DEFAULT	0x55550000		/* set all tag bits */
#define IA32_FCR_DEFAULT	0x17800000037fUL	/* extended precision, all masks */

#define IA32_PTRACE_GETREGS	12
#define IA32_PTRACE_SETREGS	13
#define IA32_PTRACE_GETFPREGS	14
#define IA32_PTRACE_SETFPREGS	15
#define IA32_PTRACE_GETFPXREGS	18
#define IA32_PTRACE_SETFPXREGS	19

#define ia32_start_thread(regs,new_ip,new_sp) do {				\
	set_fs(USER_DS);							\
	ia64_psr(regs)->cpl = 3;	/* set user mode */			\
	ia64_psr(regs)->ri = 0;		/* clear return slot number */		\
	ia64_psr(regs)->is = 1;		/* IA-32 instruction set */		\
	regs->cr_iip = new_ip;							\
	regs->ar_rsc = 0xc;		/* enforced lazy mode, priv. level 3 */	\
	regs->ar_rnat = 0;							\
	regs->loadrs = 0;							\
	regs->r12 = new_sp;							\
} while (0)

/*
 * Local Descriptor Table (LDT) related declarations.
 */

#define IA32_LDT_ENTRIES	8192		/* Maximum number of LDT entries supported. */
#define IA32_LDT_ENTRY_SIZE	8		/* The size of each LDT entry. */

#define LDT_entry_a(info) \
	((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))

#define LDT_entry_b(info)				\
	(((info)->base_addr & 0xff000000) |		\
	(((info)->base_addr & 0x00ff0000) >> 16) |	\
	((info)->limit & 0xf0000) |			\
	(((info)->read_exec_only ^ 1) << 9) |		\
	((info)->contents << 10) |			\
	(((info)->seg_not_present ^ 1) << 15) |		\
	((info)->seg_32bit << 22) |			\
	((info)->limit_in_pages << 23) |		\
	((info)->useable << 20) |			\
	0x7100)

#define LDT_empty(info) (			\
	(info)->base_addr	== 0	&&	\
	(info)->limit		== 0	&&	\
	(info)->contents	== 0	&&	\
	(info)->read_exec_only	== 1	&&	\
	(info)->seg_32bit	== 0	&&	\
	(info)->limit_in_pages	== 0	&&	\
	(info)->seg_not_present	== 1	&&	\
	(info)->useable		== 0	)

static inline void
load_TLS (struct thread_struct *t, unsigned int cpu)
{
	extern unsigned long *cpu_gdt_table[NR_CPUS];

	memcpy(cpu_gdt_table[cpu] + GDT_ENTRY_TLS_MIN + 0, &t->tls_array[0], sizeof(long));
	memcpy(cpu_gdt_table[cpu] + GDT_ENTRY_TLS_MIN + 1, &t->tls_array[1], sizeof(long));
	memcpy(cpu_gdt_table[cpu] + GDT_ENTRY_TLS_MIN + 2, &t->tls_array[2], sizeof(long));
}

struct ia32_user_desc {
	unsigned int entry_number;
	unsigned int base_addr;
	unsigned int limit;
	unsigned int seg_32bit:1;
	unsigned int contents:2;
	unsigned int read_exec_only:1;
	unsigned int limit_in_pages:1;
	unsigned int seg_not_present:1;
	unsigned int useable:1;
};

struct linux_binprm;

extern void ia32_init_addr_space (struct pt_regs *regs);
extern int ia32_setup_arg_pages (struct linux_binprm *bprm, int exec_stack);
extern unsigned long ia32_do_mmap (struct file *, unsigned long, unsigned long, int, int, loff_t);
extern void ia32_load_segment_descriptors (struct task_struct *task);

#define ia32f2ia64f(dst,src)			\
do {						\
	ia64_ldfe(6,src);			\
	ia64_stop();				\
	ia64_stf_spill(dst, 6);			\
} while(0)

#define ia64f2ia32f(dst,src)			\
do {						\
	ia64_ldf_fill(6, src);			\
	ia64_stop();				\
	ia64_stfe(dst, 6);			\
} while(0)

struct user_regs_struct32 {
	__u32 ebx, ecx, edx, esi, edi, ebp, eax;
	unsigned short ds, __ds, es, __es;
	unsigned short fs, __fs, gs, __gs;
	__u32 orig_eax, eip;
	unsigned short cs, __cs;
	__u32 eflags, esp;
	unsigned short ss, __ss;
};

/* Prototypes for use in elfcore32.h */
extern int save_ia32_fpstate (struct task_struct *, struct ia32_user_i387_struct __user *);
extern int save_ia32_fpxstate (struct task_struct *, struct ia32_user_fxsr_struct __user *);

#endif /* !CONFIG_IA32_SUPPORT */

#endif /* _ASM_IA64_IA32_PRIV_H */