aboutsummaryrefslogtreecommitdiff
path: root/arch/ia64/ia32/ia32_entry.S
blob: 02d1fb7329519e981aa99f0adfdc36a292bfc63a (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
#include <asm/asmmacro.h>
#include <asm/ia32.h>
#include <asm/asm-offsets.h>
#include <asm/signal.h>
#include <asm/thread_info.h>

#include "../kernel/minstate.h"

	/*
	 * execve() is special because in case of success, we need to
	 * setup a null register window frame (in case an IA-32 process
	 * is exec'ing an IA-64 program).
	 */
ENTRY(ia32_execve)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(3)
	alloc loc1=ar.pfs,3,2,4,0
	mov loc0=rp
	.body
	zxt4 out0=in0			// filename
	;;				// stop bit between alloc and call
	zxt4 out1=in1			// argv
	zxt4 out2=in2			// envp
	add out3=16,sp			// regs
	br.call.sptk.few rp=sys32_execve
1:	cmp.ge p6,p0=r8,r0
	mov ar.pfs=loc1			// restore ar.pfs
	;;
(p6)	mov ar.pfs=r0			// clear ar.pfs in case of success
	sxt4 r8=r8			// return 64-bit result
	mov rp=loc0
	br.ret.sptk.few rp
END(ia32_execve)

ENTRY(ia32_clone)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
	alloc r16=ar.pfs,5,2,6,0
	DO_SAVE_SWITCH_STACK
	mov loc0=rp
	mov loc1=r16				// save ar.pfs across do_fork
	.body
	zxt4 out1=in1				// newsp
	mov out3=16				// stacksize (compensates for 16-byte scratch area)
	adds out2=IA64_SWITCH_STACK_SIZE+16,sp	// out2 = &regs
	mov out0=in0				// out0 = clone_flags
	zxt4 out4=in2				// out4 = parent_tidptr
	zxt4 out5=in4				// out5 = child_tidptr
	br.call.sptk.many rp=do_fork
.ret0:	.restore sp
	adds sp=IA64_SWITCH_STACK_SIZE,sp	// pop the switch stack
	mov ar.pfs=loc1
	mov rp=loc0
	br.ret.sptk.many rp
END(ia32_clone)

GLOBAL_ENTRY(ia32_ret_from_clone)
	PT_REGS_UNWIND_INFO(0)
{	/*
	 * Some versions of gas generate bad unwind info if the first instruction of a
	 * procedure doesn't go into the first slot of a bundle.  This is a workaround.
	 */
	nop.m 0
	nop.i 0
	/*
	 * We need to call schedule_tail() to complete the scheduling process.
	 * Called by ia64_switch_to after do_fork()->copy_thread().  r8 contains the
	 * address of the previously executing task.
	 */
	br.call.sptk.many rp=ia64_invoke_schedule_tail
}
.ret1:
	adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
	;;
	ld4 r2=[r2]
	;;
	mov r8=0
	and r2=_TIF_SYSCALL_TRACEAUDIT,r2
	;;
	cmp.ne p6,p0=r2,r0
(p6)	br.cond.spnt .ia32_strace_check_retval
	;;					// prevent RAW on r8
END(ia32_ret_from_clone)
	// fall through
GLOBAL_ENTRY(ia32_ret_from_syscall)
	PT_REGS_UNWIND_INFO(0)

	cmp.ge p6,p7=r8,r0                      // syscall executed successfully?
	adds r2=IA64_PT_REGS_R8_OFFSET+16,sp    // r2 = &pt_regs.r8
	;;
	alloc r3=ar.pfs,0,0,0,0			// drop the syscall argument frame
	st8 [r2]=r8                             // store return value in slot for r8
	br.cond.sptk.many ia64_leave_kernel
END(ia32_ret_from_syscall)

	//
	// Invoke a system call, but do some tracing before and after the call.
	// We MUST preserve the current register frame throughout this routine
	// because some system calls (such as ia64_execve) directly
	// manipulate ar.pfs.
	//
	// Input:
	//	r8 = syscall number
	//	b6 = syscall entry point
	//
GLOBAL_ENTRY(ia32_trace_syscall)
	PT_REGS_UNWIND_INFO(0)
	mov r3=-38
	adds r2=IA64_PT_REGS_R8_OFFSET+16,sp
	;;
	st8 [r2]=r3				// initialize return code to -ENOSYS
	br.call.sptk.few rp=syscall_trace_enter	// give parent a chance to catch syscall args
	cmp.lt p6,p0=r8,r0			// check tracehook
	adds r2=IA64_PT_REGS_R8_OFFSET+16,sp	// r2 = &pt_regs.r8
	;;
(p6)	st8.spill [r2]=r8			// store return value in slot for r8
(p6)	br.spnt.few .ret4
.ret2:	// Need to reload arguments (they may be changed by the tracing process)
	adds r2=IA64_PT_REGS_R1_OFFSET+16,sp	// r2 = &pt_regs.r1
	adds r3=IA64_PT_REGS_R13_OFFSET+16,sp	// r3 = &pt_regs.r13
	mov r15=IA32_NR_syscalls
	;;
	ld4 r8=[r2],IA64_PT_REGS_R9_OFFSET-IA64_PT_REGS_R1_OFFSET
	movl r16=ia32_syscall_table
	;;
	ld4 r33=[r2],8				// r9 == ecx
	ld4 r37=[r3],16				// r13 == ebp
	cmp.ltu.unc p6,p7=r8,r15
	;;
	ld4 r34=[r2],8				// r10 == edx
	ld4 r36=[r3],8				// r15 == edi
(p6)	shladd r16=r8,3,r16	// force ni_syscall if not valid syscall number
	;;
	ld8 r16=[r16]
	;;
	ld4 r32=[r2],8				// r11 == ebx
	mov b6=r16
	ld4 r35=[r3],8				// r14 == esi
	br.call.sptk.few rp=b6			// do the syscall
.ia32_strace_check_retval:
	cmp.lt p6,p0=r8,r0			// syscall failed?
	adds r2=IA64_PT_REGS_R8_OFFSET+16,sp	// r2 = &pt_regs.r8
	;;
	st8.spill [r2]=r8			// store return value in slot for r8
	br.call.sptk.few rp=syscall_trace_leave	// give parent a chance to catch return value
.ret4:	alloc r2=ar.pfs,0,0,0,0			// drop the syscall argument frame
	br.cond.sptk.many ia64_leave_kernel
END(ia32_trace_syscall)

GLOBAL_ENTRY(sys32_vfork)
	alloc r16=ar.pfs,2,2,4,0;;
	mov out0=IA64_CLONE_VFORK|IA64_CLONE_VM|SIGCHLD	// out0 = clone_flags
	br.cond.sptk.few .fork1			// do the work
END(sys32_vfork)

GLOBAL_ENTRY(sys32_fork)
	.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
	alloc r16=ar.pfs,2,2,4,0
	mov out0=SIGCHLD			// out0 = clone_flags
	;;
.fork1:
	mov loc0=rp
	mov loc1=r16				// save ar.pfs across do_fork
	DO_SAVE_SWITCH_STACK

	.body

	mov out1=0
	mov out3=0
	adds out2=IA64_SWITCH_STACK_SIZE+16,sp	// out2 = &regs
	br.call.sptk.few rp=do_fork
.ret5:	.restore sp
	adds sp=IA64_SWITCH_STACK_SIZE,sp	// pop the switch stack
	mov ar.pfs=loc1
	mov rp=loc0
	br.ret.sptk.many rp
END(sys32_fork)

	.rodata
	.align 8
	.globl ia32_syscall_table
ia32_syscall_table:
	data8 sys_ni_syscall	  /* 0	-  old "setup(" system call*/
	data8 sys_exit
	data8 sys32_fork
	data8 sys_read
	data8 sys_write
	data8 compat_sys_open	  /* 5 */
	data8 sys_close
	data8 sys32_waitpid
	data8 sys_creat
	data8 sys_link
	data8 sys_unlink	  /* 10 */
	data8 ia32_execve
	data8 sys_chdir
	data8 compat_sys_time
	data8 sys_mknod
	data8 sys_chmod		  /* 15 */
	data8 sys_lchown	/* 16-bit version */
	data8 sys_ni_syscall	  /* old break syscall holder */
	data8 sys_ni_syscall
	data8 sys32_lseek
	data8 sys_getpid	  /* 20 */
	data8 compat_sys_mount
	data8 sys_oldumount
	data8 sys_setuid	/* 16-bit version */
	data8 sys_getuid	/* 16-bit version */
	data8 compat_sys_stime    /* 25 */
	data8 compat_sys_ptrace
	data8 sys32_alarm
	data8 sys_ni_syscall
	data8 sys_pause
	data8 compat_sys_utime	  /* 30 */
	data8 sys_ni_syscall	  /* old stty syscall holder */
	data8 sys_ni_syscall	  /* old gtty syscall holder */
	data8 sys_access
	data8 sys_nice
	data8 sys_ni_syscall	  /* 35 */	  /* old ftime syscall holder */
	data8 sys_sync
	data8 sys_kill
	data8 sys_rename
	data8 sys_mkdir
	data8 sys_rmdir		  /* 40 */
	data8 sys_dup
	data8 sys_ia64_pipe
	data8 compat_sys_times
	data8 sys_ni_syscall	  /* old prof syscall holder */
	data8 sys32_brk		  /* 45 */
	data8 sys_setgid	/* 16-bit version */
	data8 sys_getgid	/* 16-bit version */
	data8 sys32_signal
	data8 sys_geteuid	/* 16-bit version */
	data8 sys_getegid	/* 16-bit version */	  /* 50 */
	data8 sys_acct
	data8 sys_umount	  /* recycled never used phys( */
	data8 sys_ni_syscall	  /* old lock syscall holder */
	data8 compat_sys_ioctl
	data8 compat_sys_fcntl	  /* 55 */
	data8 sys_ni_syscall	  /* old mpx syscall holder */
	data8 sys_setpgid
	data8 sys_ni_syscall	  /* old ulimit syscall holder */
	data8 sys_ni_syscall
	data8 sys_umask		  /* 60 */
	data8 sys_chroot
	data8 compat_sys_ustat
	data8 sys_dup2
	data8 sys_getppid
	data8 sys_getpgrp	  /* 65 */
	data8 sys_setsid
	data8 sys32_sigaction
	data8 sys_ni_syscall
	data8 sys_ni_syscall
	data8 sys_setreuid	/* 16-bit version */	  /* 70 */
	data8 sys_setregid	/* 16-bit version */
	data8 sys32_sigsuspend
	data8 compat_sys_sigpending
	data8 sys_sethostname
	data8 compat_sys_setrlimit	  /* 75 */
	data8 compat_sys_old_getrlimit
	data8 compat_sys_getrusage
	data8 compat_sys_gettimeofday
	data8 compat_sys_settimeofday
	data8 sys32_getgroups16	  /* 80 */
	data8 sys32_setgroups16
	data8 sys32_old_select
	data8 sys_symlink
	data8 sys_ni_syscall
	data8 sys_readlink	  /* 85 */
	data8 sys_uselib
	data8 sys_swapon
	data8 sys_reboot
	data8 compat_sys_old_readdir
	data8 sys32_mmap	  /* 90 */
	data8 sys32_munmap
	data8 sys_truncate
	data8 sys_ftruncate
	data8 sys_fchmod
	data8 sys_fchown	/* 16-bit version */	  /* 95 */
	data8 sys_getpriority
	data8 sys_setpriority
	data8 sys_ni_syscall	  /* old profil syscall holder */
	data8 compat_sys_statfs
	data8 compat_sys_fstatfs	  /* 100 */
	data8 sys_ni_syscall	/* ioperm */
	data8 compat_sys_socketcall
	data8 sys_syslog
	data8 compat_sys_setitimer
	data8 compat_sys_getitimer	  /* 105 */
	data8 compat_sys_newstat
	data8 compat_sys_newlstat
	data8 compat_sys_newfstat
	data8 sys_ni_syscall
	data8 sys_ni_syscall	/* iopl */	/* 110 */
	data8 sys_vhangup
	data8 sys_ni_syscall		/* used to be sys_idle */
	data8 sys_ni_syscall
	data8 compat_sys_wait4
	data8 sys_swapoff	  /* 115 */
	data8 compat_sys_sysinfo
	data8 sys32_ipc
	data8 sys_fsync
	data8 sys32_sigreturn
	data8 ia32_clone	  /* 120 */
	data8 sys_setdomainname
	data8 sys32_newuname
	data8 sys32_modify_ldt
	data8 compat_sys_adjtimex
	data8 sys32_mprotect	  /* 125 */
	data8 compat_sys_sigprocmask
	data8 sys_ni_syscall	/* create_module */
	data8 sys_ni_syscall	/* init_module */
	data8 sys_ni_syscall	/* delete_module */
	data8 sys_ni_syscall	/* get_kernel_syms */  /* 130 */
	data8 sys32_quotactl
	data8 sys_getpgid
	data8 sys_fchdir
	data8 sys_ni_syscall	/* sys_bdflush */
	data8 sys_sysfs		/* 135 */
	data8 sys32_personality
	data8 sys_ni_syscall	  /* for afs_syscall */
	data8 sys_setfsuid	/* 16-bit version */
	data8 sys_setfsgid	/* 16-bit version */
	data8 sys_llseek	  /* 140 */
	data8 compat_sys_getdents
	data8 compat_sys_select
	data8 sys_flock
	data8 sys32_msync
	data8 compat_sys_readv	  /* 145 */
	data8 compat_sys_writev
	data8 sys_getsid
	data8 sys_fdatasync
	data8 sys32_sysctl
	data8 sys_mlock		  /* 150 */
	data8 sys_munlock
	data8 sys_mlockall
	data8 sys_munlockall
	data8 sys_sched_setparam
	data8 sys_sched_getparam  /* 155 */
	data8 sys_sched_setscheduler
	data8 sys_sched_getscheduler
	data8 sys_sched_yield
	data8 sys_sched_get_priority_max
	data8 sys_sched_get_priority_min	 /* 160 */
	data8 sys32_sched_rr_get_interval
	data8 compat_sys_nanosleep
	data8 sys32_mremap
	data8 sys_setresuid	/* 16-bit version */
	data8 sys32_getresuid16	/* 16-bit version */	  /* 165 */
	data8 sys_ni_syscall	/* vm86 */
	data8 sys_ni_syscall	/* sys_query_module */
	data8 sys_poll
	data8 sys_ni_syscall	/* nfsservctl */
	data8 sys_setresgid	  /* 170 */
	data8 sys32_getresgid16
	data8 sys_prctl
	data8 sys32_rt_sigreturn
	data8 sys32_rt_sigaction
	data8 sys32_rt_sigprocmask /* 175 */
	data8 sys_rt_sigpending
	data8 compat_sys_rt_sigtimedwait
	data8 sys32_rt_sigqueueinfo
	data8 compat_sys_rt_sigsuspend
	data8 sys32_pread	  /* 180 */
	data8 sys32_pwrite
	data8 sys_chown	/* 16-bit version */
	data8 sys_getcwd
	data8 sys_capget
	data8 sys_capset	  /* 185 */
	data8 sys32_sigaltstack
	data8 sys32_sendfile
	data8 sys_ni_syscall		  /* streams1 */
	data8 sys_ni_syscall		  /* streams2 */
	data8 sys32_vfork	  /* 190 */
	data8 compat_sys_getrlimit
	data8 sys32_mmap2
	data8 sys32_truncate64
	data8 sys32_ftruncate64
	data8 sys32_stat64	  /* 195 */
	data8 sys32_lstat64
	data8 sys32_fstat64
	data8 sys_lchown
	data8 sys_getuid
	data8 sys_getgid	  /* 200 */
	data8 sys_geteuid
	data8 sys_getegid
	data8 sys_setreuid
	data8 sys_setregid
	data8 sys_getgroups	  /* 205 */
	data8 sys_setgroups
	data8 sys_fchown
	data8 sys_setresuid
	data8 sys_getresuid
	data8 sys_setresgid	  /* 210 */
	data8 sys_getresgid
	data8 sys_chown
	data8 sys_setuid
	data8 sys_setgid
	data8 sys_setfsuid	  /* 215 */
	data8 sys_setfsgid
	data8 sys_pivot_root
	data8 sys_mincore
	data8 sys_madvise
	data8 compat_sys_getdents64	  /* 220 */
	data8 compat_sys_fcntl64
	data8 sys_ni_syscall		/* reserved for TUX */
	data8 sys_ni_syscall		/* reserved for Security */
	data8 sys_gettid
	data8 sys_readahead	  /* 225 */
 	data8 sys_setxattr
 	data8 sys_lsetxattr
 	data8 sys_fsetxattr
 	data8 sys_getxattr
 	data8 sys_lgetxattr	/* 230 */
 	data8 sys_fgetxattr
 	data8 sys_listxattr
 	data8 sys_llistxattr
 	data8 sys_flistxattr
 	data8 sys_removexattr	/* 235 */
 	data8 sys_lremovexattr
 	data8 sys_fremovexattr
	data8 sys_tkill
 	data8 sys_sendfile64
	data8 compat_sys_futex	/* 240 */
	data8 compat_sys_sched_setaffinity
	data8 compat_sys_sched_getaffinity
	data8 sys32_set_thread_area
	data8 sys32_get_thread_area
 	data8 compat_sys_io_setup	/* 245 */
 	data8 sys_io_destroy
 	data8 compat_sys_io_getevents
 	data8 compat_sys_io_submit
 	data8 sys_io_cancel
 	data8 sys_fadvise64	/* 250 */
	data8 sys_ni_syscall
	data8 sys_exit_group
 	data8 sys_lookup_dcookie
	data8 sys_epoll_create
	data8 sys32_epoll_ctl	/* 255 */
	data8 sys32_epoll_wait
	data8 sys_remap_file_pages
	data8 sys_set_tid_address
 	data8 compat_sys_timer_create
 	data8 compat_sys_timer_settime	/* 260 */
 	data8 compat_sys_timer_gettime
 	data8 sys_timer_getoverrun
 	data8 sys_timer_delete
 	data8 compat_sys_clock_settime
 	data8 compat_sys_clock_gettime /* 265 */
 	data8 compat_sys_clock_getres
 	data8 compat_sys_clock_nanosleep
	data8 compat_sys_statfs64
	data8 compat_sys_fstatfs64
 	data8 sys_tgkill	/* 270 */
 	data8 compat_sys_utimes
 	data8 sys32_fadvise64_64
 	data8 sys_ni_syscall
  	data8 sys_ni_syscall
 	data8 sys_ni_syscall	/* 275 */
  	data8 sys_ni_syscall
  	data8 compat_sys_mq_open
  	data8 sys_mq_unlink
  	data8 compat_sys_mq_timedsend
  	data8 compat_sys_mq_timedreceive	/* 280 */
  	data8 compat_sys_mq_notify
  	data8 compat_sys_mq_getsetattr
	data8 sys_ni_syscall		/* reserved for kexec */
	data8 compat_sys_waitid

	// guard against failures to increase IA32_NR_syscalls
	.org ia32_syscall_table + 8*IA32_NR_syscalls