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1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * Copyright (C) 1999, 2000, 2002 Niibe Yutaka
4 * Copyright (C) 2003 - 2008 Paul Mundt
5 */
6
7! NOTE:
8! GNU as (as of 2.9.1) changes bf/s into bt/s and bra, when the address
9! to be jumped is too far, but it causes illegal slot exception.
10
11/*
12 * entry.S contains the system-call and fault low-level handling routines.
13 * This also contains the timer-interrupt handler, as well as all interrupts
14 * and faults that can result in a task-switch.
15 *
16 * NOTE: This code handles signal-recognition, which happens every time
17 * after a timer-interrupt and after each system call.
18 *
19 * NOTE: This code uses a convention that instructions in the delay slot
20 * of a transfer-control instruction are indented by an extra space, thus:
21 *
22 * jmp @k0 ! control-transfer instruction
23 * ldc k1, ssr ! delay slot
24 *
25 * Stack layout in 'ret_from_syscall':
26 * ptrace needs to have all regs on the stack.
27 * if the order here is changed, it needs to be
28 * updated in ptrace.c and ptrace.h
29 *
30 * r0
31 * ...
32 * r15 = stack pointer
33 * spc
34 * pr
35 * ssr
36 * gbr
37 * mach
38 * macl
39 * syscall #
40 *
41 */
42#include <asm/dwarf.h>
43
44#if defined(CONFIG_PREEMPT)
45# define preempt_stop() cli ; TRACE_IRQS_OFF
46#else
47# define preempt_stop()
48# define resume_kernel __restore_all
49#endif
50
51
52 .align 2
53ENTRY(exception_error)
54 !
55 TRACE_IRQS_ON
56 sti
57 mov.l 1f, r0
58 jmp @r0
59 nop
60
61 .align 2
621: .long do_exception_error
63
64 .align 2
65ret_from_exception:
66 CFI_STARTPROC simple
67 CFI_DEF_CFA r14, 0
68 CFI_REL_OFFSET 17, 64
69 CFI_REL_OFFSET 15, 60
70 CFI_REL_OFFSET 14, 56
71 CFI_REL_OFFSET 13, 52
72 CFI_REL_OFFSET 12, 48
73 CFI_REL_OFFSET 11, 44
74 CFI_REL_OFFSET 10, 40
75 CFI_REL_OFFSET 9, 36
76 CFI_REL_OFFSET 8, 32
77 preempt_stop()
78ENTRY(ret_from_irq)
79 !
80 mov #OFF_SR, r0
81 mov.l @(r0,r15), r0 ! get status register
82 shll r0
83 shll r0 ! kernel space?
84 get_current_thread_info r8, r0
85 bt resume_kernel ! Yes, it's from kernel, go back soon
86
87#ifdef CONFIG_PREEMPT
88 bra resume_userspace
89 nop
90ENTRY(resume_kernel)
91 cli
92 TRACE_IRQS_OFF
93 mov.l @(TI_PRE_COUNT,r8), r0 ! current_thread_info->preempt_count
94 tst r0, r0
95 bf noresched
96need_resched:
97 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
98 tst #_TIF_NEED_RESCHED, r0 ! need_resched set?
99 bt noresched
100
101 mov #OFF_SR, r0
102 mov.l @(r0,r15), r0 ! get status register
103 shlr r0
104 and #(0xf0>>1), r0 ! interrupts off (exception path)?
105 cmp/eq #(0xf0>>1), r0
106 bt noresched
107 mov.l 1f, r0
108 jsr @r0 ! call preempt_schedule_irq
109 nop
110 bra need_resched
111 nop
112
113noresched:
114 bra __restore_all
115 nop
116
117 .align 2
1181: .long preempt_schedule_irq
119#endif
120
121ENTRY(resume_userspace)
122 ! r8: current_thread_info
123 cli
124 TRACE_IRQS_OFF
125 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
126 tst #(_TIF_WORK_MASK & 0xff), r0
127 bt/s __restore_all
128 tst #_TIF_NEED_RESCHED, r0
129
130 .align 2
131work_pending:
132 ! r0: current_thread_info->flags
133 ! r8: current_thread_info
134 ! t: result of "tst #_TIF_NEED_RESCHED, r0"
135 bf/s work_resched
136 tst #(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME), r0
137work_notifysig:
138 bt/s __restore_all
139 mov r15, r4
140 mov r12, r5 ! set arg1(save_r0)
141 mov r0, r6
142 sti
143 mov.l 2f, r1
144 mov.l 3f, r0
145 jmp @r1
146 lds r0, pr
147work_resched:
148 mov.l 1f, r1
149 jsr @r1 ! schedule
150 nop
151 cli
152 TRACE_IRQS_OFF
153 !
154 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
155 tst #(_TIF_WORK_MASK & 0xff), r0
156 bt __restore_all
157 bra work_pending
158 tst #_TIF_NEED_RESCHED, r0
159
160 .align 2
1611: .long schedule
1622: .long do_notify_resume
1633: .long resume_userspace
164
165 .align 2
166syscall_exit_work:
167 ! r0: current_thread_info->flags
168 ! r8: current_thread_info
169 tst #(_TIF_WORK_SYSCALL_MASK & 0xff), r0
170 bt/s work_pending
171 tst #_TIF_NEED_RESCHED, r0
172 TRACE_IRQS_ON
173 sti
174 mov r15, r4
175 mov.l 8f, r0 ! do_syscall_trace_leave
176 jsr @r0
177 nop
178 bra resume_userspace
179 nop
180
181 .align 2
182syscall_trace_entry:
183 ! Yes it is traced.
184 mov r15, r4
185 mov.l 7f, r11 ! Call do_syscall_trace_enter which notifies
186 jsr @r11 ! superior (will chomp R[0-7])
187 nop
188 mov.l r0, @(OFF_R0,r15) ! Save return value
189 ! Reload R0-R4 from kernel stack, where the
190 ! parent may have modified them using
191 ! ptrace(POKEUSR). (Note that R0-R2 are
192 ! reloaded from the kernel stack by syscall_call
193 ! below, so don't need to be reloaded here.)
194 ! This allows the parent to rewrite system calls
195 ! and args on the fly.
196 mov.l @(OFF_R4,r15), r4 ! arg0
197 mov.l @(OFF_R5,r15), r5
198 mov.l @(OFF_R6,r15), r6
199 mov.l @(OFF_R7,r15), r7 ! arg3
200 mov.l @(OFF_R3,r15), r3 ! syscall_nr
201 !
202 mov.l 2f, r10 ! Number of syscalls
203 cmp/hs r10, r3
204 bf syscall_call
205 mov #-ENOSYS, r0
206 bra syscall_exit
207 mov.l r0, @(OFF_R0,r15) ! Return value
208
209__restore_all:
210 mov #OFF_SR, r0
211 mov.l @(r0,r15), r0 ! get status register
212
213 shlr2 r0
214 and #0x3c, r0
215 cmp/eq #0x3c, r0
216 bt 1f
217 TRACE_IRQS_ON
218 bra 2f
219 nop
2201:
221 TRACE_IRQS_OFF
2222:
223 mov.l 3f, r0
224 jmp @r0
225 nop
226
227 .align 2
2283: .long restore_all
229
230 .align 2
231syscall_badsys: ! Bad syscall number
232 get_current_thread_info r8, r0
233 mov #-ENOSYS, r0
234 bra resume_userspace
235 mov.l r0, @(OFF_R0,r15) ! Return value
236
237/*
238 * The main debug trap handler.
239 *
240 * r8=TRA (not the trap number!)
241 *
242 * Note: This assumes that the trapa value is left in its original
243 * form (without the shlr2 shift) so the calculation for the jump
244 * call table offset remains a simple in place mask.
245 */
246debug_trap:
247 mov r8, r0
248 and #(0xf << 2), r0
249 mov.l 1f, r8
250 add r0, r8
251 mov.l @r8, r8
252 jsr @r8
253 nop
254 bra ret_from_exception
255 nop
256 CFI_ENDPROC
257
258 .align 2
2591: .long debug_trap_table
260
261/*
262 * Syscall interface:
263 *
264 * Syscall #: R3
265 * Arguments #0 to #3: R4--R7
266 * Arguments #4 to #6: R0, R1, R2
267 * TRA: See following table.
268 *
269 * (TRA>>2) Purpose
270 * -------- -------
271 * 0x00-0x0f original SH-3/4 syscall ABI (not in general use).
272 * 0x10-0x1f general SH-3/4 syscall ABI.
273 * 0x1f unified SH-2/3/4 syscall ABI (preferred).
274 * 0x20-0x2f original SH-2 syscall ABI.
275 * 0x30-0x3f debug traps used by the kernel.
276 * 0x40-0xff Not supported by all parts, so left unhandled.
277 *
278 * For making system calls, any trap number in the range for the
279 * given cpu model may be used, but the unified trap number 0x1f is
280 * preferred for compatibility with all models.
281 *
282 * The low bits of the trap number were once documented as matching
283 * the number of arguments, but they were never actually used as such
284 * by the kernel. SH-2 originally used its own separate trap range
285 * because several hardware exceptions fell in the range used for the
286 * SH-3/4 syscall ABI.
287 *
288 * This code also handles delegating other traps to the BIOS/gdb stub.
289 *
290 * Note: When we're first called, the TRA value must be shifted
291 * right 2 bits in order to get the value that was used as the "trapa"
292 * argument.
293 */
294
295 .align 2
296 .globl ret_from_fork
297ret_from_fork:
298 mov.l 1f, r8
299 jsr @r8
300 mov r0, r4
301 bra syscall_exit
302 nop
303
304 .align 2
305 .globl ret_from_kernel_thread
306ret_from_kernel_thread:
307 mov.l 1f, r8
308 jsr @r8
309 mov r0, r4
310 mov.l @(OFF_R5,r15), r5 ! fn
311 jsr @r5
312 mov.l @(OFF_R4,r15), r4 ! arg
313 bra syscall_exit
314 nop
315
316 .align 2
3171: .long schedule_tail
318
319/*
320 * The poorly named main trapa decode and dispatch routine, for
321 * system calls and debug traps through their respective jump tables.
322 */
323ENTRY(system_call)
324 setup_frame_reg
325#if !defined(CONFIG_CPU_SH2)
326 mov.l 1f, r9
327 mov.l @r9, r8 ! Read from TRA (Trap Address) Register
328#endif
329
330 mov #OFF_TRA, r10
331 add r15, r10
332 mov.l r8, @r10 ! set TRA value to tra
333
334 /*
335 * Check the trap type
336 */
337 mov #((0x20 << 2) - 1), r9
338 cmp/hi r9, r8
339 bt/s debug_trap ! it's a debug trap..
340 nop
341
342 TRACE_IRQS_ON
343 sti
344
345 !
346 get_current_thread_info r8, r10
347 mov.l @(TI_FLAGS,r8), r8
348 mov #(_TIF_WORK_SYSCALL_MASK & 0xff), r10
349 mov #(_TIF_WORK_SYSCALL_MASK >> 8), r9
350 tst r10, r8
351 shll8 r9
352 bf syscall_trace_entry
353 tst r9, r8
354 bf syscall_trace_entry
355 !
356 mov.l 2f, r8 ! Number of syscalls
357 cmp/hs r8, r3
358 bt syscall_badsys
359 !
360syscall_call:
361 shll2 r3 ! x4
362 mov.l 3f, r8 ! Load the address of sys_call_table
363 add r8, r3
364 mov.l @r3, r8
365 mov.l @(OFF_R2,r15), r2
366 mov.l @(OFF_R1,r15), r1
367 mov.l @(OFF_R0,r15), r0
368 mov.l r2, @-r15
369 mov.l r1, @-r15
370 mov.l r0, @-r15
371 jsr @r8 ! jump to specific syscall handler
372 nop
373 add #12, r15
374 mov.l @(OFF_R0,r15), r12 ! save r0
375 mov.l r0, @(OFF_R0,r15) ! save the return value
376 !
377syscall_exit:
378 cli
379 TRACE_IRQS_OFF
380 !
381 get_current_thread_info r8, r0
382 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
383 tst #(_TIF_ALLWORK_MASK & 0xff), r0
384 mov #(_TIF_ALLWORK_MASK >> 8), r1
385 bf syscall_exit_work
386 shlr8 r0
387 tst r0, r1
388 bf syscall_exit_work
389 bra __restore_all
390 nop
391 .align 2
392#if !defined(CONFIG_CPU_SH2)
3931: .long TRA
394#endif
3952: .long NR_syscalls
3963: .long sys_call_table
3977: .long do_syscall_trace_enter
3988: .long do_syscall_trace_leave
1/* SPDX-License-Identifier: GPL-2.0
2 *
3 * Copyright (C) 1999, 2000, 2002 Niibe Yutaka
4 * Copyright (C) 2003 - 2008 Paul Mundt
5 */
6
7! NOTE:
8! GNU as (as of 2.9.1) changes bf/s into bt/s and bra, when the address
9! to be jumped is too far, but it causes illegal slot exception.
10
11/*
12 * entry.S contains the system-call and fault low-level handling routines.
13 * This also contains the timer-interrupt handler, as well as all interrupts
14 * and faults that can result in a task-switch.
15 *
16 * NOTE: This code handles signal-recognition, which happens every time
17 * after a timer-interrupt and after each system call.
18 *
19 * NOTE: This code uses a convention that instructions in the delay slot
20 * of a transfer-control instruction are indented by an extra space, thus:
21 *
22 * jmp @k0 ! control-transfer instruction
23 * ldc k1, ssr ! delay slot
24 *
25 * Stack layout in 'ret_from_syscall':
26 * ptrace needs to have all regs on the stack.
27 * if the order here is changed, it needs to be
28 * updated in ptrace.c and ptrace.h
29 *
30 * r0
31 * ...
32 * r15 = stack pointer
33 * spc
34 * pr
35 * ssr
36 * gbr
37 * mach
38 * macl
39 * syscall #
40 *
41 */
42#include <asm/dwarf.h>
43
44#if defined(CONFIG_PREEMPTION)
45# define preempt_stop() cli ; TRACE_IRQS_OFF
46#else
47# define preempt_stop()
48# define resume_kernel __restore_all
49#endif
50
51
52 .align 2
53ENTRY(exception_error)
54 !
55 TRACE_IRQS_ON
56 sti
57 mov.l 1f, r0
58 jmp @r0
59 nop
60
61 .align 2
621: .long do_exception_error
63
64 .align 2
65ret_from_exception:
66 CFI_STARTPROC simple
67 CFI_DEF_CFA r14, 0
68 CFI_REL_OFFSET 17, 64
69 CFI_REL_OFFSET 15, 60
70 CFI_REL_OFFSET 14, 56
71 CFI_REL_OFFSET 13, 52
72 CFI_REL_OFFSET 12, 48
73 CFI_REL_OFFSET 11, 44
74 CFI_REL_OFFSET 10, 40
75 CFI_REL_OFFSET 9, 36
76 CFI_REL_OFFSET 8, 32
77 preempt_stop()
78ENTRY(ret_from_irq)
79 !
80 mov #OFF_SR, r0
81 mov.l @(r0,r15), r0 ! get status register
82 shll r0
83 shll r0 ! kernel space?
84 get_current_thread_info r8, r0
85 bt resume_kernel ! Yes, it's from kernel, go back soon
86
87#ifdef CONFIG_PREEMPTION
88 bra resume_userspace
89 nop
90ENTRY(resume_kernel)
91 cli
92 TRACE_IRQS_OFF
93 mov.l @(TI_PRE_COUNT,r8), r0 ! current_thread_info->preempt_count
94 tst r0, r0
95 bf noresched
96need_resched:
97 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
98 tst #_TIF_NEED_RESCHED, r0 ! need_resched set?
99 bt noresched
100
101 mov #OFF_SR, r0
102 mov.l @(r0,r15), r0 ! get status register
103 shlr r0
104 and #(0xf0>>1), r0 ! interrupts off (exception path)?
105 cmp/eq #(0xf0>>1), r0
106 bt noresched
107 mov.l 1f, r0
108 jsr @r0 ! call preempt_schedule_irq
109 nop
110 bra need_resched
111 nop
112
113noresched:
114 bra __restore_all
115 nop
116
117 .align 2
1181: .long preempt_schedule_irq
119#endif
120
121ENTRY(resume_userspace)
122 ! r8: current_thread_info
123 cli
124 TRACE_IRQS_OFF
125 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
126 tst #(_TIF_WORK_MASK & 0xff), r0
127 bt/s __restore_all
128 tst #_TIF_NEED_RESCHED, r0
129
130 .align 2
131work_pending:
132 ! r0: current_thread_info->flags
133 ! r8: current_thread_info
134 ! t: result of "tst #_TIF_NEED_RESCHED, r0"
135 bf/s work_resched
136 tst #(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME), r0
137work_notifysig:
138 bt/s __restore_all
139 mov r15, r4
140 mov r12, r5 ! set arg1(save_r0)
141 mov r0, r6
142 sti
143 mov.l 2f, r1
144 mov.l 3f, r0
145 jmp @r1
146 lds r0, pr
147work_resched:
148 mov.l 1f, r1
149 jsr @r1 ! schedule
150 nop
151 cli
152 TRACE_IRQS_OFF
153 !
154 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
155 tst #(_TIF_WORK_MASK & 0xff), r0
156 bt __restore_all
157 bra work_pending
158 tst #_TIF_NEED_RESCHED, r0
159
160 .align 2
1611: .long schedule
1622: .long do_notify_resume
1633: .long resume_userspace
164
165 .align 2
166syscall_exit_work:
167 ! r0: current_thread_info->flags
168 ! r8: current_thread_info
169 tst #(_TIF_WORK_SYSCALL_MASK & 0xff), r0
170 bt/s work_pending
171 tst #_TIF_NEED_RESCHED, r0
172 TRACE_IRQS_ON
173 sti
174 mov r15, r4
175 mov.l 8f, r0 ! do_syscall_trace_leave
176 jsr @r0
177 nop
178 bra resume_userspace
179 nop
180
181__restore_all:
182 mov #OFF_SR, r0
183 mov.l @(r0,r15), r0 ! get status register
184
185 shlr2 r0
186 and #0x3c, r0
187 cmp/eq #0x3c, r0
188 bt 1f
189 TRACE_IRQS_ON
190 bra 2f
191 nop
1921:
193 TRACE_IRQS_OFF
1942:
195 mov.l 3f, r0
196 jmp @r0
197 nop
198
199 .align 2
2003: .long restore_all
201
202 .align 2
203syscall_badsys: ! Bad syscall number
204 get_current_thread_info r8, r0
205 mov #-ENOSYS, r0
206 bra resume_userspace
207 mov.l r0, @(OFF_R0,r15) ! Return value
208
209/*
210 * The main debug trap handler.
211 *
212 * r8=TRA (not the trap number!)
213 *
214 * Note: This assumes that the trapa value is left in its original
215 * form (without the shlr2 shift) so the calculation for the jump
216 * call table offset remains a simple in place mask.
217 */
218debug_trap:
219 mov r8, r0
220 and #(0xf << 2), r0
221 mov.l 1f, r8
222 add r0, r8
223 mov.l @r8, r8
224 jsr @r8
225 nop
226 bra ret_from_exception
227 nop
228 CFI_ENDPROC
229
230 .align 2
2311: .long debug_trap_table
232
233/*
234 * Syscall interface:
235 *
236 * Syscall #: R3
237 * Arguments #0 to #3: R4--R7
238 * Arguments #4 to #6: R0, R1, R2
239 * TRA: See following table.
240 *
241 * (TRA>>2) Purpose
242 * -------- -------
243 * 0x00-0x0f original SH-3/4 syscall ABI (not in general use).
244 * 0x10-0x1f general SH-3/4 syscall ABI.
245 * 0x1f unified SH-2/3/4 syscall ABI (preferred).
246 * 0x20-0x2f original SH-2 syscall ABI.
247 * 0x30-0x3f debug traps used by the kernel.
248 * 0x40-0xff Not supported by all parts, so left unhandled.
249 *
250 * For making system calls, any trap number in the range for the
251 * given cpu model may be used, but the unified trap number 0x1f is
252 * preferred for compatibility with all models.
253 *
254 * The low bits of the trap number were once documented as matching
255 * the number of arguments, but they were never actually used as such
256 * by the kernel. SH-2 originally used its own separate trap range
257 * because several hardware exceptions fell in the range used for the
258 * SH-3/4 syscall ABI.
259 *
260 * This code also handles delegating other traps to the BIOS/gdb stub.
261 *
262 * Note: When we're first called, the TRA value must be shifted
263 * right 2 bits in order to get the value that was used as the "trapa"
264 * argument.
265 */
266
267 .align 2
268 .globl ret_from_fork
269ret_from_fork:
270 mov.l 1f, r8
271 jsr @r8
272 mov r0, r4
273 bra syscall_exit
274 nop
275
276 .align 2
277 .globl ret_from_kernel_thread
278ret_from_kernel_thread:
279 mov.l 1f, r8
280 jsr @r8
281 mov r0, r4
282 mov.l @(OFF_R5,r15), r5 ! fn
283 jsr @r5
284 mov.l @(OFF_R4,r15), r4 ! arg
285 bra syscall_exit
286 nop
287
288 .align 2
2891: .long schedule_tail
290
291/*
292 * The poorly named main trapa decode and dispatch routine, for
293 * system calls and debug traps through their respective jump tables.
294 */
295ENTRY(system_call)
296 setup_frame_reg
297#if !defined(CONFIG_CPU_SH2)
298 mov.l 1f, r9
299 mov.l @r9, r8 ! Read from TRA (Trap Address) Register
300#endif
301
302 mov #OFF_TRA, r10
303 add r15, r10
304 mov.l r8, @r10 ! set TRA value to tra
305
306 /*
307 * Check the trap type
308 */
309 mov #((0x20 << 2) - 1), r9
310 cmp/hi r9, r8
311 bt/s debug_trap ! it's a debug trap..
312 nop
313
314 TRACE_IRQS_ON
315 sti
316
317 !
318 get_current_thread_info r8, r10
319 mov.l @(TI_FLAGS,r8), r8
320 mov #(_TIF_WORK_SYSCALL_MASK & 0xff), r10
321 mov #(_TIF_WORK_SYSCALL_MASK >> 8), r9
322 tst r10, r8
323 shll8 r9
324 bf syscall_trace_entry
325 tst r9, r8
326 bf syscall_trace_entry
327 !
328 mov.l 6f, r8 ! Number of syscalls
329 cmp/hs r8, r3
330 bt syscall_badsys
331 !
332syscall_call:
333 shll2 r3 ! x4
334 mov.l 3f, r8 ! Load the address of sys_call_table
335 add r8, r3
336 mov.l @r3, r8
337 mov.l @(OFF_R2,r15), r2
338 mov.l @(OFF_R1,r15), r1
339 mov.l @(OFF_R0,r15), r0
340 mov.l r2, @-r15
341 mov.l r1, @-r15
342 mov.l r0, @-r15
343 jsr @r8 ! jump to specific syscall handler
344 nop
345 add #12, r15
346 mov.l @(OFF_R0,r15), r12 ! save r0
347 mov.l r0, @(OFF_R0,r15) ! save the return value
348 !
349syscall_exit:
350 cli
351 TRACE_IRQS_OFF
352 !
353 get_current_thread_info r8, r0
354 mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags
355 tst #(_TIF_ALLWORK_MASK & 0xff), r0
356 mov #(_TIF_ALLWORK_MASK >> 8), r1
357 bf syscall_exit_work
358 shlr8 r0
359 tst r0, r1
360 bf syscall_exit_work
361 bra __restore_all
362 nop
363
364 .align 2
365syscall_trace_entry:
366 ! Yes it is traced.
367 mov r15, r4
368 mov.l 7f, r11 ! Call do_syscall_trace_enter which notifies
369 jsr @r11 ! superior (will chomp R[0-7])
370 nop
371 cmp/eq #-1, r0
372 bt syscall_exit
373 ! Reload R0-R4 from kernel stack, where the
374 ! parent may have modified them using
375 ! ptrace(POKEUSR). (Note that R0-R2 are
376 ! reloaded from the kernel stack by syscall_call
377 ! below, so don't need to be reloaded here.)
378 ! This allows the parent to rewrite system calls
379 ! and args on the fly.
380 mov.l @(OFF_R4,r15), r4 ! arg0
381 mov.l @(OFF_R5,r15), r5
382 mov.l @(OFF_R6,r15), r6
383 mov.l @(OFF_R7,r15), r7 ! arg3
384 mov.l @(OFF_R3,r15), r3 ! syscall_nr
385 !
386 mov.l 6f, r10 ! Number of syscalls
387 cmp/hs r10, r3
388 bf syscall_call
389 mov #-ENOSYS, r0
390 bra syscall_exit
391 mov.l r0, @(OFF_R0,r15) ! Return value
392
393 .align 2
394#if !defined(CONFIG_CPU_SH2)
3951: .long TRA
396#endif
3976: .long NR_syscalls
3983: .long sys_call_table
3997: .long do_syscall_trace_enter
4008: .long do_syscall_trace_leave