1 /* 1 /*
2 * linux/arch/nios2/kernel/entry.S !! 2 * arch/alpha/kernel/entry.S
3 * 3 *
4 * Copyright (C) 2013-2014 Altera Corporation !! 4 * Kernel entry-points.
5 * Copyright (C) 2009, Wind River Systems Inc <<
6 * <<
7 * Implemented by fredrik.markstrom@gmail.com <<
8 * <<
9 * Copyright (C) 1999-2002, Greg Ungerer (ger <<
10 * Copyright (C) 1998 D. Jeff Dionne <jeff@li <<
11 * Kenneth Albanowski <kja <<
12 * Copyright (C) 2000 Lineo Inc. (www.lineo. <<
13 * Copyright (C) 2004 Microtronix Datacom Lt <<
14 * <<
15 * This file is subject to the terms and condi <<
16 * License. See the file "COPYING" in the mai <<
17 * for more details. <<
18 * <<
19 * Linux/m68k support by Hamish Macdonald <<
20 * <<
21 * 68060 fixes by Jesper Skov <<
22 * ColdFire support by Greg Ungerer (gerg@snap <<
23 * 5307 fixes by David W. Miller <<
24 * linux 2.4 support David McCullough <davidm@s <<
25 */ 5 */
26 6
27 #include <linux/sys.h> !! 7 #include <linux/config.h>
28 #include <linux/linkage.h> !! 8 #include <asm/asm_offsets.h>
29 #include <asm/asm-offsets.h> <<
30 #include <asm/asm-macros.h> <<
31 #include <asm/thread_info.h> 9 #include <asm/thread_info.h>
>> 10 #include <asm/pal.h>
32 #include <asm/errno.h> 11 #include <asm/errno.h>
33 #include <asm/setup.h> <<
34 #include <asm/entry.h> <<
35 #include <asm/unistd.h> 12 #include <asm/unistd.h>
36 #include <asm/processor.h> <<
37 13
38 .macro GET_THREAD_INFO reg !! 14 .text
39 .if THREAD_SIZE & 0xffff0000 !! 15 .set noat
40 andhi \reg, sp, %hi(~(THREAD_SIZE-1) <<
41 .else <<
42 addi \reg, r0, %lo(~(THREAD_SIZE-1) <<
43 and \reg, \reg, sp <<
44 .endif <<
45 .endm <<
46 16
47 .macro kuser_cmpxchg_check !! 17 /* Stack offsets. */
48 /* !! 18 #define SP_OFF 184
49 * Make sure our user space atomic hel !! 19 #define SWITCH_STACK_SIZE 320
50 * interrupted in a critical region. <<
51 * ea-4 = address of interrupted insn <<
52 * sp = saved regs. <<
53 * cmpxchg_ldw = first critical insn, <<
54 * If ea <= cmpxchg_stw and ea > cmpxc <<
55 * cmpxchg_ldw + 4. <<
56 */ <<
57 /* et = cmpxchg_stw + 4 */ <<
58 movui et, (KUSER_BASE + 4 + (cmpxchg <<
59 bgtu ea, et, 1f <<
60 <<
61 subi et, et, (cmpxchg_stw - cmpxchg <<
62 bltu ea, et, 1f <<
63 stw et, PT_EA(sp) /* fix up EA * <<
64 mov ea, et <<
65 1: <<
66 .endm <<
67 <<
68 .section .rodata <<
69 .align 4 <<
70 exception_table: <<
71 .word unhandled_exception /* 0 - <<
72 .word unhandled_exception /* 1 - <<
73 .word external_interrupt /* 2 - <<
74 .word handle_trap /* 3 - <<
75 <<
76 .word instruction_trap /* 4 - <<
77 .word handle_illegal /* 5 - <<
78 .word handle_unaligned /* 6 - <<
79 .word handle_unaligned /* 7 - <<
80 <<
81 .word handle_diverror /* 8 - <<
82 .word protection_exception_ba /* 9 - <<
83 .word protection_exception_instr /* 10 <<
84 .word protection_exception_ba /* 11 <<
85 <<
86 .word unhandled_exception /* 12 <<
87 .word protection_exception_pte /* 13 <<
88 .word protection_exception_pte /* 14 <<
89 .word protection_exception_pte /* 15 <<
90 <<
91 .word unhandled_exception /* 16 <<
92 <<
93 trap_table: <<
94 .word handle_system_call /* 0 <<
95 .word handle_trap_1 /* 1 <<
96 .word handle_trap_2 /* 2 <<
97 .word handle_trap_3 /* 3 <<
98 .word handle_trap_reserved /* 4 <<
99 .word handle_trap_reserved /* 5 <<
100 .word handle_trap_reserved /* 6 <<
101 .word handle_trap_reserved /* 7 <<
102 .word handle_trap_reserved /* 8 <<
103 .word handle_trap_reserved /* 9 <<
104 .word handle_trap_reserved /* 10 <<
105 .word handle_trap_reserved /* 11 <<
106 .word handle_trap_reserved /* 12 <<
107 .word handle_trap_reserved /* 13 <<
108 .word handle_trap_reserved /* 14 <<
109 .word handle_trap_reserved /* 15 <<
110 .word handle_trap_reserved /* 16 <<
111 .word handle_trap_reserved /* 17 <<
112 .word handle_trap_reserved /* 18 <<
113 .word handle_trap_reserved /* 19 <<
114 .word handle_trap_reserved /* 20 <<
115 .word handle_trap_reserved /* 21 <<
116 .word handle_trap_reserved /* 22 <<
117 .word handle_trap_reserved /* 23 <<
118 .word handle_trap_reserved /* 24 <<
119 .word handle_trap_reserved /* 25 <<
120 .word handle_trap_reserved /* 26 <<
121 .word handle_trap_reserved /* 27 <<
122 .word handle_trap_reserved /* 28 <<
123 .word handle_trap_reserved /* 29 <<
124 #ifdef CONFIG_KGDB <<
125 .word handle_kgdb_breakpoint /* 30 <<
126 #else <<
127 .word instruction_trap <<
128 #endif <<
129 .word handle_breakpoint /* 31 <<
130 20
131 .text !! 21 /*
132 .set noat !! 22 * This defines the normal kernel pt-regs layout.
133 .set nobreak !! 23 *
>> 24 * regs 9-15 preserved by C code
>> 25 * regs 16-18 saved by PAL-code
>> 26 * regs 29-30 saved and set up by PAL-code
>> 27 * JRP - Save regs 16-18 in a special area of the stack, so that
>> 28 * the palcode-provided values are available to the signal handler.
>> 29 */
134 30
135 ENTRY(inthandler) !! 31 #define SAVE_ALL \
136 SAVE_ALL !! 32 subq $sp, SP_OFF, $sp; \
>> 33 stq $0, 0($sp); \
>> 34 stq $1, 8($sp); \
>> 35 stq $2, 16($sp); \
>> 36 stq $3, 24($sp); \
>> 37 stq $4, 32($sp); \
>> 38 stq $28, 144($sp); \
>> 39 lda $2, alpha_mv; \
>> 40 stq $5, 40($sp); \
>> 41 stq $6, 48($sp); \
>> 42 stq $7, 56($sp); \
>> 43 stq $8, 64($sp); \
>> 44 stq $19, 72($sp); \
>> 45 stq $20, 80($sp); \
>> 46 stq $21, 88($sp); \
>> 47 ldq $2, HAE_CACHE($2); \
>> 48 stq $22, 96($sp); \
>> 49 stq $23, 104($sp); \
>> 50 stq $24, 112($sp); \
>> 51 stq $25, 120($sp); \
>> 52 stq $26, 128($sp); \
>> 53 stq $27, 136($sp); \
>> 54 stq $2, 152($sp); \
>> 55 stq $16, 160($sp); \
>> 56 stq $17, 168($sp); \
>> 57 stq $18, 176($sp)
>> 58
>> 59 #define RESTORE_ALL \
>> 60 lda $19, alpha_mv; \
>> 61 ldq $0, 0($sp); \
>> 62 ldq $1, 8($sp); \
>> 63 ldq $2, 16($sp); \
>> 64 ldq $3, 24($sp); \
>> 65 ldq $21, 152($sp); \
>> 66 ldq $20, HAE_CACHE($19); \
>> 67 ldq $4, 32($sp); \
>> 68 ldq $5, 40($sp); \
>> 69 ldq $6, 48($sp); \
>> 70 ldq $7, 56($sp); \
>> 71 subq $20, $21, $20; \
>> 72 ldq $8, 64($sp); \
>> 73 beq $20, 99f; \
>> 74 ldq $20, HAE_REG($19); \
>> 75 stq $21, HAE_CACHE($19); \
>> 76 stq $21, 0($20); \
>> 77 ldq $0, 0($sp); \
>> 78 ldq $1, 8($sp); \
>> 79 99:; \
>> 80 ldq $19, 72($sp); \
>> 81 ldq $20, 80($sp); \
>> 82 ldq $21, 88($sp); \
>> 83 ldq $22, 96($sp); \
>> 84 ldq $23, 104($sp); \
>> 85 ldq $24, 112($sp); \
>> 86 ldq $25, 120($sp); \
>> 87 ldq $26, 128($sp); \
>> 88 ldq $27, 136($sp); \
>> 89 ldq $28, 144($sp); \
>> 90 addq $sp, SP_OFF, $sp
137 91
138 kuser_cmpxchg_check !! 92 /*
>> 93 * Non-syscall kernel entry points.
>> 94 */
139 95
140 /* Clear EH bit before we get a new ex !! 96 .align 4
141 * and after we have saved it to the e !! 97 .globl entInt
142 * whether it's trap, tlb-miss or inte !! 98 .ent entInt
143 * estatus is not updated the next exc !! 99 entInt:
144 */ !! 100 SAVE_ALL
145 rdctl r24, status !! 101 lda $8, 0x3fff
146 movi r9, %lo(~STATUS_EH) !! 102 lda $26, ret_from_sys_call
147 and r24, r24, r9 !! 103 bic $sp, $8, $8
148 wrctl status, r24 !! 104 mov $sp, $19
149 !! 105 jsr $31, do_entInt
150 /* Read cause and vector and branch to !! 106 .end entInt
151 mov r4, sp !! 107
152 rdctl r5, exception !! 108 .align 4
153 movia r9, exception_table !! 109 .globl entArith
154 add r24, r9, r5 !! 110 .ent entArith
155 ldw r24, 0(r24) !! 111 entArith:
156 jmp r24 !! 112 SAVE_ALL
157 !! 113 lda $8, 0x3fff
158 !! 114 lda $26, ret_from_sys_call
159 /********************************************* !! 115 bic $sp, $8, $8
160 * Handle traps !! 116 mov $sp, $18
161 ********************************************* !! 117 jsr $31, do_entArith
162 */ !! 118 .end entArith
163 ENTRY(handle_trap) !! 119
164 ldwio r24, -4(ea) /* instruction !! 120 .align 4
165 srli r24, r24, 4 !! 121 .globl entMM
166 andi r24, r24, 0x7c !! 122 .ent entMM
167 movia r9,trap_table !! 123 entMM:
168 add r24, r24, r9 !! 124 SAVE_ALL
169 ldw r24, 0(r24) !! 125 /* save $9 - $15 so the inline exception code can manipulate them. */
170 jmp r24 !! 126 subq $sp, 56, $sp
171 !! 127 stq $9, 0($sp)
172 !! 128 stq $10, 8($sp)
173 /********************************************* !! 129 stq $11, 16($sp)
174 * Handle system calls !! 130 stq $12, 24($sp)
175 ********************************************* !! 131 stq $13, 32($sp)
176 */ !! 132 stq $14, 40($sp)
177 ENTRY(handle_system_call) !! 133 stq $15, 48($sp)
178 /* Enable interrupts */ !! 134 addq $sp, 56, $19
179 rdctl r10, status !! 135 /* handle the fault */
180 ori r10, r10, STATUS_PIE !! 136 lda $8, 0x3fff
181 wrctl status, r10 !! 137 bic $sp, $8, $8
182 !! 138 jsr $26, do_page_fault
183 /* Reload registers destroyed by commo !! 139 /* reload the registers after the exception code played. */
184 ldw r4, PT_R4(sp) !! 140 ldq $9, 0($sp)
185 ldw r5, PT_R5(sp) !! 141 ldq $10, 8($sp)
186 !! 142 ldq $11, 16($sp)
187 local_restart: !! 143 ldq $12, 24($sp)
188 stw r2, PT_ORIG_R2(sp) !! 144 ldq $13, 32($sp)
189 /* Check that the requested system cal !! 145 ldq $14, 40($sp)
190 movui r1, __NR_syscalls !! 146 ldq $15, 48($sp)
191 bgeu r2, r1, ret_invsyscall !! 147 addq $sp, 56, $sp
192 slli r1, r2, 2 !! 148 /* finish up the syscall as normal. */
193 movhi r11, %hiadj(sys_call_table) !! 149 br ret_from_sys_call
194 add r1, r1, r11 !! 150 .end entMM
195 ldw r1, %lo(sys_call_table)(r1) !! 151
196 !! 152 .align 4
197 /* Check if we are being traced */ !! 153 .globl entIF
198 GET_THREAD_INFO r11 !! 154 .ent entIF
199 ldw r11,TI_FLAGS(r11) !! 155 entIF:
200 BTBNZ r11,r11,TIF_SYSCALL_TRACE,trac !! 156 SAVE_ALL
201 !! 157 lda $8, 0x3fff
202 /* Execute the system call */ !! 158 lda $26, ret_from_sys_call
203 callr r1 !! 159 bic $sp, $8, $8
204 !! 160 mov $sp, $17
205 /* If the syscall returns a negative r !! 161 jsr $31, do_entIF
206 * Set r7 to 1 to indicate error, !! 162 .end entIF
207 * Negate r2 to get a positive error !! 163
208 * If the syscall returns zero or a po !! 164 .align 4
209 * Set r7 to 0. !! 165 .globl entUna
210 * The sigreturn system calls will ski !! 166 .ent entUna
211 * adding to register ra. To avoid des !! 167 entUna:
212 */ !! 168 lda $sp, -256($sp)
213 translate_rc_and_ret: !! 169 stq $0, 0($sp)
214 movi r1, 0 !! 170 ldq $0, 256($sp) /* get PS */
215 bge r2, zero, 3f !! 171 stq $1, 8($sp)
216 ldw r1, PT_ORIG_R2(sp) !! 172 stq $2, 16($sp)
217 addi r1, r1, 1 !! 173 stq $3, 24($sp)
218 beq r1, zero, 3f !! 174 and $0, 8, $0 /* user mode? */
219 sub r2, zero, r2 !! 175 stq $4, 32($sp)
220 movi r1, 1 !! 176 bne $0, entUnaUser /* yup -> do user-level unaligned fault */
221 3: !! 177 stq $5, 40($sp)
222 stw r2, PT_R2(sp) !! 178 stq $6, 48($sp)
223 stw r1, PT_R7(sp) !! 179 stq $7, 56($sp)
224 end_translate_rc_and_ret: !! 180 stq $8, 64($sp)
225 !! 181 stq $9, 72($sp)
226 ret_from_exception: !! 182 stq $10, 80($sp)
227 ldw r1, PT_ESTATUS(sp) !! 183 stq $11, 88($sp)
228 /* if so, skip resched, signals */ !! 184 stq $12, 96($sp)
229 TSTBNZ r1, r1, ESTATUS_EU, Luser_retu !! 185 stq $13, 104($sp)
>> 186 stq $14, 112($sp)
>> 187 stq $15, 120($sp)
>> 188 /* 16-18 PAL-saved */
>> 189 stq $19, 152($sp)
>> 190 stq $20, 160($sp)
>> 191 stq $21, 168($sp)
>> 192 stq $22, 176($sp)
>> 193 stq $23, 184($sp)
>> 194 stq $24, 192($sp)
>> 195 stq $25, 200($sp)
>> 196 stq $26, 208($sp)
>> 197 stq $27, 216($sp)
>> 198 stq $28, 224($sp)
>> 199 stq $gp, 232($sp)
>> 200 lda $8, 0x3fff
>> 201 stq $31, 248($sp)
>> 202 bic $sp, $8, $8
>> 203 jsr $26, do_entUna
>> 204 ldq $0, 0($sp)
>> 205 ldq $1, 8($sp)
>> 206 ldq $2, 16($sp)
>> 207 ldq $3, 24($sp)
>> 208 ldq $4, 32($sp)
>> 209 ldq $5, 40($sp)
>> 210 ldq $6, 48($sp)
>> 211 ldq $7, 56($sp)
>> 212 ldq $8, 64($sp)
>> 213 ldq $9, 72($sp)
>> 214 ldq $10, 80($sp)
>> 215 ldq $11, 88($sp)
>> 216 ldq $12, 96($sp)
>> 217 ldq $13, 104($sp)
>> 218 ldq $14, 112($sp)
>> 219 ldq $15, 120($sp)
>> 220 /* 16-18 PAL-saved */
>> 221 ldq $19, 152($sp)
>> 222 ldq $20, 160($sp)
>> 223 ldq $21, 168($sp)
>> 224 ldq $22, 176($sp)
>> 225 ldq $23, 184($sp)
>> 226 ldq $24, 192($sp)
>> 227 ldq $25, 200($sp)
>> 228 ldq $26, 208($sp)
>> 229 ldq $27, 216($sp)
>> 230 ldq $28, 224($sp)
>> 231 ldq $gp, 232($sp)
>> 232 lda $sp, 256($sp)
>> 233 call_pal PAL_rti
>> 234 .end entUna
>> 235
>> 236 .align 4
>> 237 .ent entUnaUser
>> 238 entUnaUser:
>> 239 ldq $0, 0($sp) /* restore original $0 */
>> 240 lda $sp, 256($sp) /* pop entUna's stack frame */
>> 241 SAVE_ALL /* setup normal kernel stack */
>> 242 lda $sp, -56($sp)
>> 243 stq $9, 0($sp)
>> 244 stq $10, 8($sp)
>> 245 stq $11, 16($sp)
>> 246 stq $12, 24($sp)
>> 247 stq $13, 32($sp)
>> 248 stq $14, 40($sp)
>> 249 stq $15, 48($sp)
>> 250 lda $8, 0x3fff
>> 251 addq $sp, 56, $19
>> 252 bic $sp, $8, $8
>> 253 jsr $26, do_entUnaUser
>> 254 ldq $9, 0($sp)
>> 255 ldq $10, 8($sp)
>> 256 ldq $11, 16($sp)
>> 257 ldq $12, 24($sp)
>> 258 ldq $13, 32($sp)
>> 259 ldq $14, 40($sp)
>> 260 ldq $15, 48($sp)
>> 261 lda $sp, 56($sp)
>> 262 br ret_from_sys_call
>> 263 .end entUnaUser
>> 264
>> 265 .align 4
>> 266 .globl entDbg
>> 267 .ent entDbg
>> 268 entDbg:
>> 269 SAVE_ALL
>> 270 lda $8, 0x3fff
>> 271 lda $26, ret_from_sys_call
>> 272 bic $sp, $8, $8
>> 273 mov $sp, $16
>> 274 jsr $31, do_entDbg
>> 275 .end entDbg
>> 276
>> 277 /*
>> 278 * The system call entry point is special. Most importantly, it looks
>> 279 * like a function call to userspace as far as clobbered registers. We
>> 280 * do preserve the argument registers (for syscall restarts) and $26
>> 281 * (for leaf syscall functions).
>> 282 *
>> 283 * So much for theory. We don't take advantage of this yet.
>> 284 *
>> 285 * Note that a0-a2 are not saved by PALcode as with the other entry points.
>> 286 */
230 287
>> 288 .align 4
>> 289 .globl entSys
>> 290 .globl ret_from_sys_call
>> 291 .ent entSys
>> 292 entSys:
>> 293 SAVE_ALL
>> 294 lda $8, 0x3fff
>> 295 bic $sp, $8, $8
>> 296 lda $4, NR_SYSCALLS($31)
>> 297 stq $16, SP_OFF+24($sp)
>> 298 lda $5, sys_call_table
>> 299 lda $27, sys_ni_syscall
>> 300 cmpult $0, $4, $4
>> 301 ldl $3, TI_FLAGS($8)
>> 302 stq $17, SP_OFF+32($sp)
>> 303 s8addq $0, $5, $5
>> 304 stq $18, SP_OFF+40($sp)
>> 305 blbs $3, strace
>> 306 beq $4, 1f
>> 307 ldq $27, 0($5)
>> 308 1: jsr $26, ($27), alpha_ni_syscall
>> 309 ldgp $gp, 0($26)
>> 310 blt $0, $syscall_error /* the call failed */
>> 311 stq $0, 0($sp)
>> 312 stq $31, 72($sp) /* a3=0 => no error */
>> 313
>> 314 .align 4
>> 315 ret_from_sys_call:
>> 316 cmovne $26, 0, $19 /* $19 = 0 => non-restartable */
>> 317 ldq $0, SP_OFF($sp)
>> 318 and $0, 8, $0
>> 319 beq $0, restore_all
>> 320 ret_from_reschedule:
>> 321 /* Make sure need_resched and sigpending don't change between
>> 322 sampling and the rti. */
>> 323 lda $16, 7
>> 324 call_pal PAL_swpipl
>> 325 ldl $5, TI_FLAGS($8)
>> 326 and $5, _TIF_WORK_MASK, $2
>> 327 bne $5, work_pending
231 restore_all: 328 restore_all:
232 rdctl r10, status <<
233 andi r10, r10, %lo(~STATUS_PIE) <<
234 wrctl status, r10 <<
235 RESTORE_ALL 329 RESTORE_ALL
236 eret !! 330 call_pal PAL_rti
237 <<
238 /* If the syscall number was invalid r <<
239 ret_invsyscall: <<
240 movi r2, -ENOSYS <<
241 br translate_rc_and_ret <<
242 <<
243 /* This implements the same as above, <<
244 * do_syscall_trace_enter and do_sysca <<
245 * syscall in order for utilities like <<
246 */ <<
247 traced_system_call: <<
248 SAVE_SWITCH_STACK <<
249 call do_syscall_trace_enter <<
250 RESTORE_SWITCH_STACK <<
251 <<
252 /* Create system call register argumen <<
253 arguments on stack are already in p <<
254 of pt_regs. */ <<
255 ldw r2, PT_R2(sp) <<
256 ldw r4, PT_R4(sp) <<
257 ldw r5, PT_R5(sp) <<
258 ldw r6, PT_R6(sp) <<
259 ldw r7, PT_R7(sp) <<
260 <<
261 /* Fetch the syscall function. */ <<
262 movui r1, __NR_syscalls <<
263 bgeu r2, r1, traced_invsyscall <<
264 slli r1, r2, 2 <<
265 movhi r11,%hiadj(sys_call_table) <<
266 add r1, r1, r11 <<
267 ldw r1, %lo(sys_call_table)(r1) <<
268 <<
269 callr r1 <<
270 <<
271 /* If the syscall returns a negative r <<
272 * Set r7 to 1 to indicate error, <<
273 * Negate r2 to get a positive error <<
274 * If the syscall returns zero or a po <<
275 * Set r7 to 0. <<
276 * The sigreturn system calls will ski <<
277 * adding to register ra. To avoid des <<
278 */ <<
279 translate_rc_and_ret2: <<
280 movi r1, 0 <<
281 bge r2, zero, 4f <<
282 ldw r1, PT_ORIG_R2(sp) <<
283 addi r1, r1, 1 <<
284 beq r1, zero, 4f <<
285 sub r2, zero, r2 <<
286 movi r1, 1 <<
287 4: <<
288 stw r2, PT_R2(sp) <<
289 stw r1, PT_R7(sp) <<
290 end_translate_rc_and_ret2: <<
291 SAVE_SWITCH_STACK <<
292 call do_syscall_trace_exit <<
293 RESTORE_SWITCH_STACK <<
294 br ret_from_exception <<
295 <<
296 /* If the syscall number was invalid r <<
297 traced_invsyscall: <<
298 movi r2, -ENOSYS <<
299 br translate_rc_and_ret2 <<
300 <<
301 Luser_return: <<
302 GET_THREAD_INFO r11 <<
303 ldw r10, TI_FLAGS(r11) <<
304 ANDI32 r11, r10, _TIF_WORK_MASK <<
305 beq r11, r0, restore_all <<
306 BTBZ r1, r10, TIF_NEED_RESCHED, Lsi <<
307 <<
308 /* Reschedule work */ <<
309 call schedule <<
310 br ret_from_exception <<
311 <<
312 Lsignal_return: <<
313 ANDI32 r1, r10, _TIF_SIGPENDING | _TI <<
314 beq r1, r0, restore_all <<
315 mov r4, sp /* pt_ <<
316 SAVE_SWITCH_STACK <<
317 call do_notify_resume <<
318 beq r2, r0, no_work_pending <<
319 RESTORE_SWITCH_STACK <<
320 /* prepare restart syscall here withou <<
321 ldw r2, PT_R2(sp) /* reload sysc <<
322 ldw r4, PT_R4(sp) /* reload sysc <<
323 ldw r5, PT_R5(sp) <<
324 ldw r6, PT_R6(sp) <<
325 ldw r7, PT_R7(sp) <<
326 ldw r8, PT_R8(sp) <<
327 ldw r9, PT_R9(sp) <<
328 br local_restart /* restart sys <<
329 <<
330 no_work_pending: <<
331 RESTORE_SWITCH_STACK <<
332 br ret_from_exception <<
333 <<
334 /********************************************* <<
335 * Handle external interrupts. <<
336 ********************************************* <<
337 */ <<
338 /* <<
339 * This is the generic interrupt handler (for <<
340 * sources). It figures out the vector number <<
341 * interrupt service routine directly. <<
342 */ <<
343 external_interrupt: <<
344 rdctl r12, ipending <<
345 rdctl r9, ienable <<
346 and r12, r12, r9 <<
347 /* skip if no interrupt is pending */ <<
348 beq r12, r0, ret_from_interrupt <<
349 331
>> 332 .align 3
>> 333 $syscall_error:
350 /* 334 /*
351 * Process an external hardware interr !! 335 * Some system calls (e.g., ptrace) can return arbitrary
>> 336 * values which might normally be mistaken as error numbers.
>> 337 * Those functions must zero $0 (v0) directly in the stack
>> 338 * frame to indicate that a negative return value wasn't an
>> 339 * error number..
352 */ 340 */
>> 341 ldq $19, 0($sp) /* old syscall nr (zero if success) */
>> 342 beq $19, $ret_success
353 343
354 addi ea, ea, -4 /* re-issue th !! 344 ldq $20, 72($sp) /* .. and this a3 */
355 stw ea, PT_EA(sp) !! 345 subq $31, $0, $0 /* with error in v0 */
356 2: movi r4, %lo(-1) /* Start from !! 346 addq $31, 1, $1 /* set a3 for errno return */
357 highes !! 347 stq $0, 0($sp)
358 /* This is the !! 348 mov $31, $26 /* tell "ret_from_sys_call" we can restart */
359 1: andi r10, r12, 1 /* Isolate bit !! 349 stq $1, 72($sp) /* a3 for return */
360 srli r12, r12, 1 /* shift count !! 350 br ret_from_sys_call
361 multip !! 351
362 addi r4, r4, 1 !! 352 $ret_success:
363 beq r10, r0, 1b !! 353 stq $0, 0($sp)
364 mov r5, sp /* Setup pt_re !! 354 stq $31, 72($sp) /* a3=0 => no error */
365 call do_IRQ !! 355 br ret_from_sys_call
366 rdctl r12, ipending /* check again !! 356 .end entSys
367 rdctl r9, ienable /* Isolate pos !! 357
368 and r12, r12, r9 !! 358 /*
369 bne r12, r0, 2b !! 359 * Do all cleanup when returning from all interrupts and system calls.
370 /* br ret_from_interrupt */ /* fall !! 360 *
371 !! 361 * Arguments:
372 ENTRY(ret_from_interrupt) !! 362 * $5: TI_FLAGS.
373 ldw r1, PT_ESTATUS(sp) /* che !! 363 * $8: current.
374 TSTBNZ r1, r1, ESTATUS_EU, Luser_retu !! 364 * $19: The old syscall number, or zero if this is not a return
375 !! 365 * from a syscall that errored and is possibly restartable.
376 #ifdef CONFIG_PREEMPTION !! 366 * $20: Error indication.
377 GET_THREAD_INFO r1 !! 367 */
378 ldw r4, TI_PREEMPT_COUNT(r1) !! 368
379 bne r4, r0, restore_all !! 369 .align 4
380 ldw r4, TI_FLAGS(r1) !! 370 .ent work_pending
381 BTBZ r10, r4, TIF_NEED_RESCHED, res !! 371 work_pending:
382 ldw r4, PT_ESTATUS(sp) /* ? I !! 372 and $5, _TIF_NEED_RESCHED, $2
383 andi r10, r4, ESTATUS_EPIE !! 373 beq $2, $work_notifysig
384 beq r10, r0, restore_all !! 374
385 call preempt_schedule_irq !! 375 $work_resched:
386 #endif !! 376 subq $sp, 16, $sp
>> 377 stq $19, 0($sp) /* save syscall nr */
>> 378 stq $20, 8($sp) /* and error indication (a3) */
>> 379 jsr $26, schedule
>> 380 ldq $19, 0($sp)
>> 381 ldq $20, 8($sp)
>> 382 addq $sp, 16, $sp
>> 383 /* Make sure need_resched and sigpending don't change between
>> 384 sampling and the rti. */
>> 385 lda $16, 7
>> 386 call_pal PAL_swpipl
>> 387 ldl $5, TI_FLAGS($8)
>> 388 and $5, _TIF_WORK_MASK, $2
>> 389 beq $2, restore_all
>> 390 and $5, _TIF_NEED_RESCHED, $2
>> 391 bne $2, $work_resched
>> 392
>> 393 $work_notifysig:
>> 394 mov $sp, $17
>> 395 br $1, do_switch_stack
>> 396 mov $5, $21
>> 397 mov $sp, $18
>> 398 mov $31, $16
>> 399 jsr $26, do_notify_resume
>> 400 bsr $1, undo_switch_stack
387 br restore_all 401 br restore_all
>> 402 .end work_pending
388 403
389 /********************************************* !! 404 /*
390 * A few syscall wrappers !! 405 * PTRACE syscall handler
391 ********************************************* !! 406 */
392 */ <<
393 /* <<
394 * int clone(unsigned long clone_flags, unsign <<
395 * int __user * parent_tidptr, in <<
396 * int tls_val) <<
397 */ <<
398 ENTRY(sys_clone) <<
399 SAVE_SWITCH_STACK <<
400 subi sp, sp, 4 /* make space for tl <<
401 stw r8, 0(sp) /* pass tls pointer <<
402 call nios2_clone <<
403 addi sp, sp, 4 <<
404 RESTORE_SWITCH_STACK <<
405 ret <<
406 <<
407 ENTRY(sys_rt_sigreturn) <<
408 SAVE_SWITCH_STACK <<
409 mov r4, sp <<
410 call do_rt_sigreturn <<
411 RESTORE_SWITCH_STACK <<
412 addi ra, ra, (end_translate_rc_and_ <<
413 ret <<
414 <<
415 /********************************************* <<
416 * A few other wrappers and stubs <<
417 ********************************************* <<
418 */ <<
419 protection_exception_pte: <<
420 rdctl r6, pteaddr <<
421 slli r6, r6, 10 <<
422 call do_page_fault <<
423 br ret_from_exception <<
424 <<
425 protection_exception_ba: <<
426 rdctl r6, badaddr <<
427 call do_page_fault <<
428 br ret_from_exception <<
429 <<
430 protection_exception_instr: <<
431 call handle_supervisor_instr <<
432 br ret_from_exception <<
433 <<
434 handle_breakpoint: <<
435 call breakpoint_c <<
436 br ret_from_exception <<
437 <<
438 #ifdef CONFIG_NIOS2_ALIGNMENT_TRAP <<
439 handle_unaligned: <<
440 SAVE_SWITCH_STACK <<
441 call handle_unaligned_c <<
442 RESTORE_SWITCH_STACK <<
443 br ret_from_exception <<
444 #else <<
445 handle_unaligned: <<
446 call handle_unaligned_c <<
447 br ret_from_exception <<
448 #endif <<
449 407
450 handle_illegal: !! 408 .align 4
451 call handle_illegal_c !! 409 .ent strace
452 br ret_from_exception !! 410 strace:
453 !! 411 /* set up signal stack, call syscall_trace */
454 handle_diverror: !! 412 bsr $1, do_switch_stack
455 call handle_diverror_c !! 413 jsr $26, syscall_trace
456 br ret_from_exception !! 414 bsr $1, undo_switch_stack
457 !! 415
458 #ifdef CONFIG_KGDB !! 416 /* get the system call number and the arguments back.. */
459 handle_kgdb_breakpoint: !! 417 ldq $0, 0($sp)
460 call kgdb_breakpoint_c !! 418 ldq $16, SP_OFF+24($sp)
461 br ret_from_exception !! 419 ldq $17, SP_OFF+32($sp)
462 #endif !! 420 ldq $18, SP_OFF+40($sp)
>> 421 ldq $19, 72($sp)
>> 422 ldq $20, 80($sp)
>> 423 ldq $21, 88($sp)
>> 424
>> 425 /* get the system call pointer.. */
>> 426 lda $1, NR_SYSCALLS($31)
>> 427 lda $2, sys_call_table
>> 428 lda $27, alpha_ni_syscall
>> 429 cmpult $0, $1, $1
>> 430 s8addq $0, $2, $2
>> 431 beq $1, 1f
>> 432 ldq $27, 0($2)
>> 433 1: jsr $26, ($27), sys_gettimeofday
>> 434 ldgp $gp, 0($26)
>> 435
>> 436 /* check return.. */
>> 437 blt $0, $strace_error /* the call failed */
>> 438 stq $31, 72($sp) /* a3=0 => no error */
>> 439 $strace_success:
>> 440 stq $0, 0($sp) /* save return value */
>> 441
>> 442 bsr $1, do_switch_stack
>> 443 jsr $26, syscall_trace
>> 444 bsr $1, undo_switch_stack
>> 445 br $31, ret_from_sys_call
>> 446
>> 447 .align 3
>> 448 $strace_error:
>> 449 ldq $19, 0($sp) /* old syscall nr (zero if success) */
>> 450 beq $19, $strace_success
>> 451 ldq $20, 72($sp) /* .. and this a3 */
>> 452
>> 453 subq $31, $0, $0 /* with error in v0 */
>> 454 addq $31, 1, $1 /* set a3 for errno return */
>> 455 stq $0, 0($sp)
>> 456 stq $1, 72($sp) /* a3 for return */
>> 457
>> 458 bsr $1, do_switch_stack
>> 459 mov $19, $9 /* save old syscall number */
>> 460 mov $20, $10 /* save old a3 */
>> 461 jsr $26, syscall_trace
>> 462 mov $9, $19
>> 463 mov $10, $20
>> 464 bsr $1, undo_switch_stack
>> 465
>> 466 mov $31, $26 /* tell "ret_from_sys_call" we can restart */
>> 467 br ret_from_sys_call
>> 468 .end strace
>> 469
>> 470 /*
>> 471 * Save and restore the switch stack -- aka the balance of the user context.
>> 472 */
463 473
464 handle_trap_1: !! 474 .align 4
465 call handle_trap_1_c !! 475 .ent do_switch_stack
466 br ret_from_exception !! 476 do_switch_stack:
>> 477 lda $sp, -SWITCH_STACK_SIZE($sp)
>> 478 stq $9, 0($sp)
>> 479 stq $10, 8($sp)
>> 480 stq $11, 16($sp)
>> 481 stq $12, 24($sp)
>> 482 stq $13, 32($sp)
>> 483 stq $14, 40($sp)
>> 484 stq $15, 48($sp)
>> 485 stq $26, 56($sp)
>> 486 stt $f0, 64($sp)
>> 487 stt $f1, 72($sp)
>> 488 stt $f2, 80($sp)
>> 489 stt $f3, 88($sp)
>> 490 stt $f4, 96($sp)
>> 491 stt $f5, 104($sp)
>> 492 stt $f6, 112($sp)
>> 493 stt $f7, 120($sp)
>> 494 stt $f8, 128($sp)
>> 495 stt $f9, 136($sp)
>> 496 stt $f10, 144($sp)
>> 497 stt $f11, 152($sp)
>> 498 stt $f12, 160($sp)
>> 499 stt $f13, 168($sp)
>> 500 stt $f14, 176($sp)
>> 501 stt $f15, 184($sp)
>> 502 stt $f16, 192($sp)
>> 503 stt $f17, 200($sp)
>> 504 stt $f18, 208($sp)
>> 505 stt $f19, 216($sp)
>> 506 stt $f20, 224($sp)
>> 507 stt $f21, 232($sp)
>> 508 stt $f22, 240($sp)
>> 509 stt $f23, 248($sp)
>> 510 stt $f24, 256($sp)
>> 511 stt $f25, 264($sp)
>> 512 stt $f26, 272($sp)
>> 513 stt $f27, 280($sp)
>> 514 mf_fpcr $f0 # get fpcr
>> 515 stt $f28, 288($sp)
>> 516 stt $f29, 296($sp)
>> 517 stt $f30, 304($sp)
>> 518 stt $f0, 312($sp) # save fpcr in slot of $f31
>> 519 ldt $f0, 64($sp) # dont let "do_switch_stack" change fp state.
>> 520 ret $31, ($1), 1
>> 521 .end do_switch_stack
>> 522
>> 523 .align 4
>> 524 .ent undo_switch_stack
>> 525 undo_switch_stack:
>> 526 ldq $9, 0($sp)
>> 527 ldq $10, 8($sp)
>> 528 ldq $11, 16($sp)
>> 529 ldq $12, 24($sp)
>> 530 ldq $13, 32($sp)
>> 531 ldq $14, 40($sp)
>> 532 ldq $15, 48($sp)
>> 533 ldq $26, 56($sp)
>> 534 ldt $f30, 312($sp) # get saved fpcr
>> 535 ldt $f0, 64($sp)
>> 536 ldt $f1, 72($sp)
>> 537 ldt $f2, 80($sp)
>> 538 ldt $f3, 88($sp)
>> 539 mt_fpcr $f30 # install saved fpcr
>> 540 ldt $f4, 96($sp)
>> 541 ldt $f5, 104($sp)
>> 542 ldt $f6, 112($sp)
>> 543 ldt $f7, 120($sp)
>> 544 ldt $f8, 128($sp)
>> 545 ldt $f9, 136($sp)
>> 546 ldt $f10, 144($sp)
>> 547 ldt $f11, 152($sp)
>> 548 ldt $f12, 160($sp)
>> 549 ldt $f13, 168($sp)
>> 550 ldt $f14, 176($sp)
>> 551 ldt $f15, 184($sp)
>> 552 ldt $f16, 192($sp)
>> 553 ldt $f17, 200($sp)
>> 554 ldt $f18, 208($sp)
>> 555 ldt $f19, 216($sp)
>> 556 ldt $f20, 224($sp)
>> 557 ldt $f21, 232($sp)
>> 558 ldt $f22, 240($sp)
>> 559 ldt $f23, 248($sp)
>> 560 ldt $f24, 256($sp)
>> 561 ldt $f25, 264($sp)
>> 562 ldt $f26, 272($sp)
>> 563 ldt $f27, 280($sp)
>> 564 ldt $f28, 288($sp)
>> 565 ldt $f29, 296($sp)
>> 566 ldt $f30, 304($sp)
>> 567 lda $sp, SWITCH_STACK_SIZE($sp)
>> 568 ret $31, ($1), 1
>> 569 .end undo_switch_stack
>> 570
>> 571 /*
>> 572 * The meat of the context switch code.
>> 573 */
>> 574
>> 575 .align 4
>> 576 .globl alpha_switch_to
>> 577 .ent alpha_switch_to
>> 578 alpha_switch_to:
>> 579 .prologue 0
>> 580 bsr $1, do_switch_stack
>> 581 call_pal PAL_swpctx
>> 582 lda $8, 0x3fff
>> 583 bsr $1, undo_switch_stack
>> 584 bic $sp, $8, $8
>> 585 mov $17, $0
>> 586 ret
>> 587 .end alpha_switch_to
467 588
468 handle_trap_2: !! 589 /*
469 call handle_trap_2_c !! 590 * New processes begin life here.
470 br ret_from_exception !! 591 */
471 592
472 handle_trap_3: !! 593 .globl ret_from_fork
473 handle_trap_reserved: !! 594 .align 4
474 call handle_trap_3_c !! 595 .ent ret_from_fork
475 br ret_from_exception !! 596 ret_from_fork:
>> 597 lda $26, ret_from_sys_call
>> 598 mov $17, $16
>> 599 jmp $31, schedule_tail
>> 600 .end ret_from_fork
476 601
477 /* 602 /*
478 * Beware - when entering resume, prev (the cu !! 603 * kernel_thread(fn, arg, clone_flags)
479 * in r4, next (the new task) is in r5, don't <<
480 * registers. <<
481 */ 604 */
482 ENTRY(resume) !! 605 .align 4
>> 606 .globl kernel_thread
>> 607 .ent kernel_thread
>> 608 kernel_thread:
>> 609 /* We can be called from a module. */
>> 610 ldgp $gp, 0($27)
>> 611 .prologue 1
>> 612 subq $sp, SP_OFF+6*8, $sp
>> 613 br $1, 2f /* load start address */
>> 614
>> 615 /* We've now "returned" from a fake system call. */
>> 616 unop
>> 617 blt $0, 1f /* error? */
>> 618 ldi $1, 0x3fff
>> 619 beq $20, 1f /* parent or child? */
>> 620
>> 621 bic $sp, $1, $8 /* in child. */
>> 622 jsr $26, ($27)
>> 623 ldgp $gp, 0($26)
>> 624 mov $0, $16
>> 625 mov $31, $26
>> 626 jmp $31, sys_exit
>> 627
>> 628 1: ret /* in parent. */
>> 629
>> 630 .align 4
>> 631 2: /* Fake a system call stack frame, as we can't do system calls
>> 632 from kernel space. Note that we store FN and ARG as they
>> 633 need to be set up in the child for the call. Also store $8
>> 634 and $26 for use in the parent. */
>> 635 stq $31, SP_OFF($sp) /* ps */
>> 636 stq $1, SP_OFF+8($sp) /* pc */
>> 637 stq $gp, SP_OFF+16($sp) /* gp */
>> 638 stq $16, 136($sp) /* $27; FN for child */
>> 639 stq $17, SP_OFF+24($sp) /* $16; ARG for child */
>> 640 stq $8, 64($sp) /* $8 */
>> 641 stq $26, 128($sp) /* $26 */
>> 642 /* Avoid the HAE being gratuitously wrong, to avoid restoring it. */
>> 643 ldq $2, alpha_mv+HAE_CACHE
>> 644 stq $2, 152($sp) /* HAE */
>> 645
>> 646 /* Shuffle FLAGS to the front; add CLONE_VM. */
>> 647 ldi $1, CLONE_VM|CLONE_UNTRACED
>> 648 or $18, $1, $16
>> 649 bsr $26, sys_clone
>> 650
>> 651 /* We don't actually care for a3 success widgetry in the kernel.
>> 652 Not for positive errno values. */
>> 653 stq $0, 0($sp) /* $0 */
>> 654 br restore_all
>> 655 .end kernel_thread
483 656
484 rdctl r7, status !! 657 /*
485 stw r7, TASK_THREAD + THREAD_KPSR( !! 658 * execve(path, argv, envp)
>> 659 */
>> 660 .align 4
>> 661 .globl execve
>> 662 .ent execve
>> 663 execve:
>> 664 /* We can be called from a module. */
>> 665 ldgp $gp, 0($27)
>> 666 lda $sp, -(32+SIZEOF_PT_REGS+8)($sp)
>> 667 .frame $sp, 32+SIZEOF_PT_REGS+8, $26, 0
>> 668 stq $26, 0($sp)
>> 669 stq $16, 8($sp)
>> 670 stq $17, 16($sp)
>> 671 stq $18, 24($sp)
>> 672 .prologue 1
>> 673
>> 674 lda $16, 32($sp)
>> 675 lda $17, 0
>> 676 lda $18, SIZEOF_PT_REGS
>> 677 bsr $26, memset !samegp
>> 678
>> 679 /* Avoid the HAE being gratuitously wrong, which would cause us
>> 680 to do the whole turn off interrupts thing and restore it. */
>> 681 ldq $2, alpha_mv+HAE_CACHE
>> 682 stq $2, 152+32($sp)
>> 683
>> 684 ldq $16, 8($sp)
>> 685 ldq $17, 16($sp)
>> 686 ldq $18, 24($sp)
>> 687 lda $19, 32($sp)
>> 688 bsr $26, do_execve !samegp
>> 689
>> 690 ldq $26, 0($sp)
>> 691 bne $0, 1f /* error! */
>> 692
>> 693 /* Move the temporary pt_regs struct from its current location
>> 694 to the top of the kernel stack frame. See copy_thread for
>> 695 details for a normal process. */
>> 696 lda $16, 0x4000 - SIZEOF_PT_REGS($8)
>> 697 lda $17, 32($sp)
>> 698 lda $18, SIZEOF_PT_REGS
>> 699 bsr $26, memmove !samegp
>> 700
>> 701 /* Take that over as our new stack frame and visit userland! */
>> 702 lda $sp, 0x4000 - SIZEOF_PT_REGS($8)
>> 703 br $31, ret_from_sys_call
486 704
487 andi r7, r7, %lo(~STATUS_PIE) !! 705 1: lda $sp, 32+SIZEOF_PT_REGS+8($sp)
488 wrctl status, r7 !! 706 ret
>> 707 .end execve
489 708
490 SAVE_SWITCH_STACK !! 709
491 stw sp, TASK_THREAD + THREAD_KSP(r !! 710 /*
492 ldw sp, TASK_THREAD + THREAD_KSP(r !! 711 * Special system calls. Most of these are special in that they either
493 movia r24, _current_thread !! 712 * have to play switch_stack games or in some way use the pt_regs struct.
494 GET_THREAD_INFO r1 !! 713 */
495 stw r1, 0(r24) !! 714 .align 4
496 RESTORE_SWITCH_STACK !! 715 .globl sys_fork
>> 716 .ent sys_fork
>> 717 sys_fork:
>> 718 .prologue 0
>> 719 mov $sp, $21
>> 720 bsr $1, do_switch_stack
>> 721 bis $31, SIGCHLD, $16
>> 722 mov $31, $17
>> 723 mov $31, $18
>> 724 mov $31, $19
>> 725 mov $31, $20
>> 726 jsr $26, alpha_clone
>> 727 bsr $1, undo_switch_stack
>> 728 ret
>> 729 .end sys_fork
497 730
498 ldw r7, TASK_THREAD + THREAD_KPSR( !! 731 .align 4
499 wrctl status, r7 !! 732 .globl sys_clone
>> 733 .ent sys_clone
>> 734 sys_clone:
>> 735 .prologue 0
>> 736 mov $sp, $21
>> 737 bsr $1, do_switch_stack
>> 738 /* $16, $17, $18, $19, $20 come from the user. */
>> 739 jsr $26, alpha_clone
>> 740 bsr $1, undo_switch_stack
500 ret 741 ret
>> 742 .end sys_clone
501 743
502 ENTRY(ret_from_fork) !! 744 .align 4
503 call schedule_tail !! 745 .globl sys_vfork
504 br ret_from_exception !! 746 .ent sys_vfork
>> 747 sys_vfork:
>> 748 .prologue 0
>> 749 mov $sp, $16
>> 750 bsr $1, do_switch_stack
>> 751 jsr $26, alpha_vfork
>> 752 bsr $1, undo_switch_stack
>> 753 ret
>> 754 .end sys_vfork
505 755
506 ENTRY(ret_from_kernel_thread) !! 756 .align 4
507 call schedule_tail !! 757 .globl sys_sigreturn
508 mov r4,r17 /* arg */ !! 758 .ent sys_sigreturn
509 callr r16 /* function */ !! 759 sys_sigreturn:
510 br ret_from_exception !! 760 .prologue 0
>> 761 mov $sp, $17
>> 762 lda $18, -SWITCH_STACK_SIZE($sp)
>> 763 lda $sp, -SWITCH_STACK_SIZE($sp)
>> 764 jsr $26, do_sigreturn
>> 765 br $1, undo_switch_stack
>> 766 br ret_from_sys_call
>> 767 .end sys_sigreturn
>> 768
>> 769 .align 4
>> 770 .globl sys_rt_sigreturn
>> 771 .ent sys_rt_sigreturn
>> 772 sys_rt_sigreturn:
>> 773 .prologue 0
>> 774 mov $sp, $17
>> 775 lda $18, -SWITCH_STACK_SIZE($sp)
>> 776 lda $sp, -SWITCH_STACK_SIZE($sp)
>> 777 jsr $26, do_rt_sigreturn
>> 778 br $1, undo_switch_stack
>> 779 br ret_from_sys_call
>> 780 .end sys_rt_sigreturn
>> 781
>> 782 .align 4
>> 783 .globl sys_sigsuspend
>> 784 .ent sys_sigsuspend
>> 785 sys_sigsuspend:
>> 786 .prologue 0
>> 787 mov $sp, $17
>> 788 br $1, do_switch_stack
>> 789 mov $sp, $18
>> 790 subq $sp, 16, $sp
>> 791 stq $26, 0($sp)
>> 792 jsr $26, do_sigsuspend
>> 793 ldq $26, 0($sp)
>> 794 lda $sp, SWITCH_STACK_SIZE+16($sp)
>> 795 ret
>> 796 .end sys_sigsuspend
511 797
512 /* !! 798 .align 4
513 * Kernel user helpers. !! 799 .globl sys_rt_sigsuspend
514 * !! 800 .ent sys_rt_sigsuspend
515 * Each segment is 64-byte aligned and will be !! 801 sys_rt_sigsuspend:
516 * New segments (if ever needed) must be added !! 802 .prologue 0
517 * This mechanism should be used only for thin !! 803 mov $sp, $18
518 * justified, and not be abused freely. !! 804 br $1, do_switch_stack
519 * !! 805 mov $sp, $19
520 */ !! 806 subq $sp, 16, $sp
>> 807 stq $26, 0($sp)
>> 808 jsr $26, do_rt_sigsuspend
>> 809 ldq $26, 0($sp)
>> 810 lda $sp, SWITCH_STACK_SIZE+16($sp)
>> 811 ret
>> 812 .end sys_rt_sigsuspend
521 813
522 /* Filling pads with undefined instructions. !! 814 .align 4
523 .macro kuser_pad sym size !! 815 .globl sys_sethae
524 .if ((. - \sym) & 3) !! 816 .ent sys_sethae
525 .rept (4 - (. - \sym) & 3) !! 817 sys_sethae:
526 .byte 0 !! 818 .prologue 0
527 .endr !! 819 stq $16, 152($sp)
528 .endif !! 820 ret
529 .rept ((\size - (. - \sym)) / 4) !! 821 .end sys_sethae
530 .word 0xdeadbeef <<
531 .endr <<
532 .endm <<
533 <<
534 .align 6 <<
535 .globl __kuser_helper_start <<
536 __kuser_helper_start: <<
537 822
538 __kuser_helper_version: !! 823 .align 4
539 .word ((__kuser_helper_end - __kuser !! 824 .globl osf_getpriority
>> 825 .ent osf_getpriority
>> 826 osf_getpriority:
>> 827 lda $sp, -16($sp)
>> 828 stq $26, 0($sp)
>> 829 .prologue 0
>> 830
>> 831 jsr $26, sys_getpriority
>> 832
>> 833 ldq $26, 0($sp)
>> 834 blt $0, 1f
>> 835
>> 836 /* Return value is the unbiased priority, i.e. 20 - prio.
>> 837 This does result in negative return values, so signal
>> 838 no error by writing into the R0 slot. */
>> 839 lda $1, 20
>> 840 stq $31, 16($sp)
>> 841 subl $1, $0, $0
>> 842 unop
540 843
541 __kuser_cmpxchg: !! 844 1: lda $sp, 16($sp)
542 /* !! 845 ret
543 * r4 pointer to exchange variable !! 846 .end osf_getpriority
544 * r5 old value !! 847
545 * r6 new value !! 848 .align 4
546 */ !! 849 .globl sys_getxuid
547 cmpxchg_ldw: !! 850 .ent sys_getxuid
548 ldw r2, 0(r4) !! 851 sys_getxuid:
549 sub r2, r2, r5 !! 852 .prologue 0
550 bne r2, zero, cmpxchg_ret !! 853 ldq $2, TI_TASK($8)
>> 854 ldl $0, TASK_UID($2)
>> 855 ldl $1, TASK_EUID($2)
>> 856 stq $1, 80($sp)
>> 857 ret
>> 858 .end sys_getxuid
551 859
552 /* We had a match, store the new value !! 860 .align 4
553 cmpxchg_stw: !! 861 .globl sys_getxgid
554 stw r6, 0(r4) !! 862 .ent sys_getxgid
555 cmpxchg_ret: !! 863 sys_getxgid:
>> 864 .prologue 0
>> 865 ldq $2, TI_TASK($8)
>> 866 ldl $0, TASK_GID($2)
>> 867 ldl $1, TASK_EGID($2)
>> 868 stq $1, 80($sp)
556 ret 869 ret
>> 870 .end sys_getxgid
557 871
558 kuser_pad __kuser_cmpxchg, 64 !! 872 .align 4
>> 873 .globl sys_getxpid
>> 874 .ent sys_getxpid
>> 875 sys_getxpid:
>> 876 .prologue 0
>> 877 ldq $2, TI_TASK($8)
>> 878
>> 879 /* See linux/kernel/timer.c sys_getppid for discussion
>> 880 about this loop. */
>> 881 ldq $3, TASK_REAL_PARENT($2)
>> 882 1: ldl $1, TASK_TGID($3)
>> 883 #ifdef CONFIG_SMP
>> 884 mov $3, $4
>> 885 mb
>> 886 ldq $3, TASK_REAL_PARENT($2)
>> 887 cmpeq $3, $4, $4
>> 888 beq $4, 1b
>> 889 #endif
>> 890 stq $1, 80($sp)
>> 891 ldl $0, TASK_TGID($2)
>> 892 ret
>> 893 .end sys_getxpid
559 894
560 .globl __kuser_sigtramp !! 895 .align 4
561 __kuser_sigtramp: !! 896 .globl sys_pipe
562 movi r2, __NR_rt_sigreturn !! 897 .ent sys_pipe
563 trap !! 898 sys_pipe:
>> 899 lda $sp, -16($sp)
>> 900 stq $26, 0($sp)
>> 901 .prologue 0
>> 902
>> 903 lda $16, 8($sp)
>> 904 jsr $26, do_pipe
>> 905
>> 906 ldq $26, 0($sp)
>> 907 bne $0, 1f
>> 908
>> 909 /* The return values are in $0 and $20. */
>> 910 ldl $1, 12($sp)
>> 911 ldl $0, 8($sp)
564 912
565 kuser_pad __kuser_sigtramp, 64 !! 913 stq $1, 80+16($sp)
>> 914 1: lda $sp, 16($sp)
>> 915 ret
>> 916 .end sys_pipe
566 917
567 .globl __kuser_helper_end !! 918 .align 4
568 __kuser_helper_end: !! 919 .globl sys_ptrace
>> 920 .ent sys_ptrace
>> 921 sys_ptrace:
>> 922 .prologue 0
>> 923 mov $sp, $20
>> 924 jmp $31, do_sys_ptrace
>> 925 .end sys_ptrace
>> 926
>> 927 .align 4
>> 928 .globl alpha_ni_syscall
>> 929 .ent alpha_ni_syscall
>> 930 alpha_ni_syscall:
>> 931 .prologue 0
>> 932 /* Special because it also implements overflow handling via
>> 933 syscall number 0. And if you recall, zero is a special
>> 934 trigger for "not an error". Store large non-zero there. */
>> 935 lda $0, -ENOSYS
>> 936 unop
>> 937 stq $0, 0($sp)
>> 938 ret
>> 939 .end alpha_ni_syscall
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