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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1997, 1998, 1999, 2000, 2001 by Ralf Baechle
 * Copyright (C) 2001 MIPS Technologies, Inc.
 */
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
/* Highest syscall used of any syscall flavour */
#define MAX_SYSCALL_NO  __NR_O32_Linux + __NR_O32_Linux_syscalls
 
        .align  5
NESTED(handle_sys, PT_SIZE, sp)
        .set    noat
        SAVE_SOME
        STI
        .set    at
 
        lw      t1, PT_EPC(sp)          # skip syscall on return
 
        sltiu   t0, v0, MAX_SYSCALL_NO + 1 # check syscall number
        addiu   t1, 4                   # skip to next instruction
        beqz    t0, illegal_syscall
        sw      t1, PT_EPC(sp)
 
        /* XXX Put both in one cacheline, should save a bit. */
        sll     t0, v0, 2
        lw      t2, sys_call_table(t0)  # syscall routine
        lbu     t3, sys_narg_table(v0)  # number of arguments
        beqz    t2, illegal_syscall
 
        subu    t0, t3, 5               # 5 or more arguments?
        sw      a3, PT_R26(sp)          # save a3 for syscall restarting
        bgez    t0, stackargs
 
stack_done:
        sw      a3, PT_R26(sp)          # save for syscall restart
        lw      t0, TASK_PTRACE($28)    # syscall tracing enabled?
        andi    t0, _PT_TRACESYS
        bnez    t0, trace_a_syscall
 
        jalr    t2                      # Do The Real Thing (TM)
 
        li      t0, -EMAXERRNO - 1      # error?
        sltu    t0, t0, v0
        sw      t0, PT_R7(sp)           # set error flag
        beqz    t0, 1f
 
        negu    v0                      # error
        sw      v0, PT_R0(sp)           # set flag for syscall restarting
1:      sw      v0, PT_R2(sp)           # result
 
fast_ret_from_sys_call:
ret_from_schedule:
        mfc0    t0, CP0_STATUS          # need_resched and signals atomic test
        ori     t0, t0, 1
        xori    t0, t0, 1
        mtc0    t0, CP0_STATUS
        SSNOP; SSNOP; SSNOP
 
        lw      t2, TASK_NEED_RESCHED($28)
        lw      v0, TASK_SIGPENDING($28)
        bnez    t2, reschedule
        bnez    v0, signal_return
restore_all:
        RESTORE_SOME
        RESTORE_SP_AND_RET
 
/* ------------------------------------------------------------------------ */
 
FEXPORT(ret_from_fork)
        move    a0, v0                  # prev
        jal     schedule_tail
        lw      t0, TASK_PTRACE($28)    # syscall tracing enabled?
        andi    t0, _PT_TRACESYS
        bnez    t0, tracesys_exit
 
static_ret_from_sys_call:
        RESTORE_STATIC
        j       fast_ret_from_sys_call
 
/* ------------------------------------------------------------------------ */
 
/* ret_from_sys_call should be here but is in entry.S.  */
 
/* ------------------------------------------------------------------------ */
 
/* Put this behind restore_all for the sake of the branch prediction.  */
signal_return:
        .type   signal_return, @function
 
        mfc0    t0, CP0_STATUS
        ori     t0, t0, 1
        mtc0    t0, CP0_STATUS
 
        SAVE_STATIC
        move    a0, zero
        move    a1, sp
        jal     do_signal
        RESTORE_STATIC
        b       restore_all
 
/* ------------------------------------------------------------------------ */
 
reschedule:
        jal     schedule
        b       ret_from_schedule
 
/* ------------------------------------------------------------------------ */
 
trace_a_syscall:
        SAVE_STATIC
        sw      t2, PT_R1(sp)
        jal     syscall_trace
        lw      t2, PT_R1(sp)
 
        lw      a0, PT_R4(sp)           # Restore argument registers
        lw      a1, PT_R5(sp)
        lw      a2, PT_R6(sp)
        lw      a3, PT_R7(sp)
        jalr    t2
 
        li      t0, -EMAXERRNO - 1      # error?
        sltu    t0, t0, v0
        sw      t0, PT_R7(sp)           # set error flag
        beqz    t0, 1f
 
        negu    v0                      # error
        sw      v0, PT_R0(sp)           # set flag for syscall restarting
1:      sw      v0, PT_R2(sp)           # result
 
tracesys_exit:
        jal     syscall_trace
        j       static_ret_from_sys_call
 
/* ------------------------------------------------------------------------ */
 
        /*
         * More than four arguments.  Try to deal with it by copying the
         * stack arguments from the user stack to the kernel stack.
         * This Sucks (TM).
         */
stackargs:
        lw      t0, PT_R29(sp)          # get old user stack pointer
        subu    t3, 4
        sll     t1, t3, 2               # stack valid?
 
        addu    t1, t0                  # end address
        or      t0, t1
        bltz    t0, bad_stack           # -> sp is bad
 
        lw      t0, PT_R29(sp)          # get old user stack pointer
        PTR_LA  t1, 3f                  # copy 1 to 2 arguments
        sll     t3, t3, 4
        subu    t1, t3
        jr      t1
 
        /* Ok, copy the args from the luser stack to the kernel stack */
        /*
         * I know Ralf doesn't like nops but this avoids code
         * duplication for R3000 targets (and this is the
         * only place where ".set reorder" doesn't help).
         * Harald.
         */
        .set    push
        .set    noreorder
        .set    nomacro
1:      lw      t1, 20(t0)              # argument #6 from usp
        nop
        sw      t1, 20(sp)
        nop
2:      lw      t1, 16(t0)              # argument #5 from usp
        nop
        sw      t1, 16(sp)
        nop
3:      .set    pop
 
        j       stack_done              # go back
 
        .section __ex_table,"a"
        PTR     1b,bad_stack
        PTR     2b,bad_stack
        .previous
 
/* ------------------------------------------------------------------------ */
 
        /*
         * The stackpointer for a call with more than 4 arguments is bad.
         * We probably should handle this case a bit more drastic.
         */
bad_stack:
        negu    v0                      # error
        sw      v0, PT_R0(sp)
        sw      v0, PT_R2(sp)
        li      t0, 1                   # set error flag
        sw      t0, PT_R7(sp)
        j       fast_ret_from_sys_call
 
/* ------------------------------------------------------------------------ */
 
        /*
         * The system call does not exist in this kernel
         */
illegal_syscall:
        lw      t0, TASK_PTRACE($28)    # syscall tracing enabled?
        andi    t0, _PT_TRACESYS
        beqz    t0, 1f
 
        SAVE_STATIC
        jal     syscall_trace
        li      t0, _PT_TRACESYS
 
1:      li      v0, ENOSYS              # error
        sw      v0, PT_R0(sp)           # set flag for syscall restarting
        sw      v0, PT_R2(sp)
        li      t1, 1                   # set error flag
        sw      t1, PT_R7(sp)
        bnez    t0, tracesys_exit
 
        j       fast_ret_from_sys_call
END(handle_sys)
 
LEAF(mips_atomic_set)
        andi    v0, a1, 3               # must be word aligned
        bnez    v0, bad_alignment
 
        lw      v1, THREAD_CURDS($28)   # in legal address range?
        addiu   a0, a1, 4
        or      a0, a0, a1
        and     a0, a0, v1
        bltz    a0, bad_address
 
#ifdef CONFIG_CPU_HAS_LLSC
        /* Ok, this is the ll/sc case.  World is sane :-)  */
1:      ll      v0, (a1)
        move    a0, a2
2:      sc      a0, (a1)
        beqz    a0, 1b
 
        .section __ex_table,"a"
        PTR     1b, bad_stack
        PTR     2b, bad_stack
        .previous
#else
        sw      a1, 16(sp)
        sw      a2, 20(sp)
 
        move    a0, sp
        move    a2, a1
        li      a1, 1
        jal     do_page_fault
 
        lw      a1, 16(sp)
        lw      a2, 20(sp)
 
        /*
         * At this point the page should be readable and writable unless
         * there was no more memory available.
         */
1:      lw      v0, (a1)
2:      sw      a2, (a1)
 
        .section __ex_table,"a"
        PTR     1b, no_mem
        PTR     2b, no_mem
        .previous
#endif
 
        sw      zero, PT_R7(sp)         # success
        sw      v0, PT_R2(sp)           # result
 
        /* Success, so skip usual error handling garbage.  */
        lw      t0, TASK_PTRACE($28)    # syscall tracing enabled?
        andi    t0, _PT_TRACESYS
        beqz    t0, fast_ret_from_sys_call
 
        SAVE_STATIC
        jal     syscall_trace
        j       static_ret_from_sys_call
 
no_mem: li      v0, -ENOMEM
        jr      ra
 
bad_address:
        li      v0, -EFAULT
        jr      ra
 
bad_alignment:
        li      v0, -EINVAL
        jr      ra
END(mips_atomic_set)
 
LEAF(sys_sysmips)
        beq     a0, MIPS_ATOMIC_SET, mips_atomic_set
        j       _sys_sysmips
END(sys_sysmips)
 
LEAF(sys_syscall)
        lw      t0, PT_R29(sp)          # user sp
 
        sltu    v0, a0, __NR_O32_Linux + __NR_O32_Linux_syscalls + 1
        beqz    v0, enosys
 
        sll     v0, a0, 2
        la      v1, sys_syscall
        lw      t2, sys_call_table(v0)  # function pointer
        lbu     t4, sys_narg_table(a0)  # number of arguments
 
        li      v0, -EINVAL
        beq     t2, v1, out             # do not recurse
 
        beqz    t2, enosys              # null function pointer?
 
        andi    v0, t0, 0x3             # unaligned stack pointer?
        bnez    v0, sigsegv
 
        addu    v0, t0, 16              # v0 = usp + 16
        addu    t1, v0, 12              # 3 32-bit arguments
        lw      v1, THREAD_CURDS($28)
        or      v0, v0, t1
        and     v1, v1, v0
        bltz    v1, efault
 
        move    a0, a1                  # shift argument registers
        move    a1, a2
        move    a2, a3
 
1:      lw      a3, 16(t0)
2:      lw      t3, 20(t0)
3:      lw      t4, 24(t0)
 
        .section        __ex_table, "a"
        .word   1b, efault
        .word   2b, efault
        .word   3b, efault
        .previous
 
        sw      t3, 16(sp)              # put into new stackframe
        sw      t4, 20(sp)
 
        bnez    t4, 1f                  # zero arguments?
        addu    a0, sp, 32              # then pass sp in a0
1:
 
        sw      t3, 16(sp)
        sw      v1, 20(sp)
        jr      t2
        /* Unreached */
 
enosys: li      v0, -ENOSYS
        b       out
 
sigsegv:
        li      a0, _SIGSEGV
        move    a1, $28
        jal     force_sig
        /* Fall through */
 
efault: li      v0, -EFAULT
 
out:    jr      ra
END(sys_syscall)

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [mips/] [kernel/] [scall_o32.S] - Blame information for rev 1275

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* This file is subject to the terms and conditions of the GNU General Public`
3			`* License. See the file "COPYING" in the main directory of this archive`
4			`* for more details.`
5			`*`
6			`* Copyright (C) 1997, 1998, 1999, 2000, 2001 by Ralf Baechle`
7			`* Copyright (C) 2001 MIPS Technologies, Inc.`
8			`*/`
9			`#include`
10			`#include`
11			`#include`
12			`#include`
13			`#include`
14			`#include`
15			`#include`
16			`#include`
17			`#include`
18			`#include`
19
20			`/* Highest syscall used of any syscall flavour */`
21			`#define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls`
22
23			`.align 5`
24			`NESTED(handle_sys, PT_SIZE, sp)`
25			`.set noat`
26			`SAVE_SOME`
27			`STI`
28			`.set at`
29
30			`lw t1, PT_EPC(sp) # skip syscall on return`
31
32			`sltiu t0, v0, MAX_SYSCALL_NO + 1 # check syscall number`
33			`addiu t1, 4 # skip to next instruction`
34			`beqz t0, illegal_syscall`
35			`sw t1, PT_EPC(sp)`
36
37			`/* XXX Put both in one cacheline, should save a bit. */`
38			`sll t0, v0, 2`
39			`lw t2, sys_call_table(t0) # syscall routine`
40			`lbu t3, sys_narg_table(v0) # number of arguments`
41			`beqz t2, illegal_syscall`
42
43			`subu t0, t3, 5 # 5 or more arguments?`
44			`sw a3, PT_R26(sp) # save a3 for syscall restarting`
45			`bgez t0, stackargs`
46
47			`stack_done:`
48			`sw a3, PT_R26(sp) # save for syscall restart`
49			`lw t0, TASK_PTRACE($28) # syscall tracing enabled?`
50			`andi t0, _PT_TRACESYS`
51			`bnez t0, trace_a_syscall`
52
53			`jalr t2 # Do The Real Thing (TM)`
54
55			`li t0, -EMAXERRNO - 1 # error?`
56			`sltu t0, t0, v0`
57			`sw t0, PT_R7(sp) # set error flag`
58			`beqz t0, 1f`
59
60			`negu v0 # error`
61			`sw v0, PT_R0(sp) # set flag for syscall restarting`
62			`1: sw v0, PT_R2(sp) # result`
63
64			`fast_ret_from_sys_call:`
65			`ret_from_schedule:`
66			`mfc0 t0, CP0_STATUS # need_resched and signals atomic test`
67			`ori t0, t0, 1`
68			`xori t0, t0, 1`
69			`mtc0 t0, CP0_STATUS`
70			`SSNOP; SSNOP; SSNOP`
71
72			`lw t2, TASK_NEED_RESCHED($28)`
73			`lw v0, TASK_SIGPENDING($28)`
74			`bnez t2, reschedule`
75			`bnez v0, signal_return`
76			`restore_all:`
77			`RESTORE_SOME`
78			`RESTORE_SP_AND_RET`
79
80			`/* ------------------------------------------------------------------------ */`
81
82			`FEXPORT(ret_from_fork)`
83			`move a0, v0 # prev`
84			`jal schedule_tail`
85			`lw t0, TASK_PTRACE($28) # syscall tracing enabled?`
86			`andi t0, _PT_TRACESYS`
87			`bnez t0, tracesys_exit`
88
89			`static_ret_from_sys_call:`
90			`RESTORE_STATIC`
91			`j fast_ret_from_sys_call`
92
93			`/* ------------------------------------------------------------------------ */`
94
95			`/* ret_from_sys_call should be here but is in entry.S. */`
96
97			`/* ------------------------------------------------------------------------ */`
98
99			`/* Put this behind restore_all for the sake of the branch prediction. */`
100			`signal_return:`
101			`.type signal_return, @function`
102
103			`mfc0 t0, CP0_STATUS`
104			`ori t0, t0, 1`
105			`mtc0 t0, CP0_STATUS`
106
107			`SAVE_STATIC`
108			`move a0, zero`
109			`move a1, sp`
110			`jal do_signal`
111			`RESTORE_STATIC`
112			`b restore_all`
113
114			`/* ------------------------------------------------------------------------ */`
115
116			`reschedule:`
117			`jal schedule`
118			`b ret_from_schedule`
119
120			`/* ------------------------------------------------------------------------ */`
121
122			`trace_a_syscall:`
123			`SAVE_STATIC`
124			`sw t2, PT_R1(sp)`
125			`jal syscall_trace`
126			`lw t2, PT_R1(sp)`
127
128			`lw a0, PT_R4(sp) # Restore argument registers`
129			`lw a1, PT_R5(sp)`
130			`lw a2, PT_R6(sp)`
131			`lw a3, PT_R7(sp)`
132			`jalr t2`
133
134			`li t0, -EMAXERRNO - 1 # error?`
135			`sltu t0, t0, v0`
136			`sw t0, PT_R7(sp) # set error flag`
137			`beqz t0, 1f`
138
139			`negu v0 # error`
140			`sw v0, PT_R0(sp) # set flag for syscall restarting`
141			`1: sw v0, PT_R2(sp) # result`
142
143			`tracesys_exit:`
144			`jal syscall_trace`
145			`j static_ret_from_sys_call`
146
147			`/* ------------------------------------------------------------------------ */`
148
149			`/*`
150			`* More than four arguments. Try to deal with it by copying the`
151			`* stack arguments from the user stack to the kernel stack.`
152			`* This Sucks (TM).`
153			`*/`
154			`stackargs:`
155			`lw t0, PT_R29(sp) # get old user stack pointer`
156			`subu t3, 4`
157			`sll t1, t3, 2 # stack valid?`
158
159			`addu t1, t0 # end address`
160			`or t0, t1`
161			`bltz t0, bad_stack # -> sp is bad`
162
163			`lw t0, PT_R29(sp) # get old user stack pointer`
164			`PTR_LA t1, 3f # copy 1 to 2 arguments`
165			`sll t3, t3, 4`
166			`subu t1, t3`
167			`jr t1`
168
169			`/* Ok, copy the args from the luser stack to the kernel stack */`
170			`/*`
171			`* I know Ralf doesn't like nops but this avoids code`
172			`* duplication for R3000 targets (and this is the`
173			`* only place where ".set reorder" doesn't help).`
174			`* Harald.`
175			`*/`
176			`.set push`
177			`.set noreorder`
178			`.set nomacro`
179			`1: lw t1, 20(t0) # argument #6 from usp`
180			`nop`
181			`sw t1, 20(sp)`
182			`nop`
183			`2: lw t1, 16(t0) # argument #5 from usp`
184			`nop`
185			`sw t1, 16(sp)`
186			`nop`
187			`3: .set pop`
188
189			`j stack_done # go back`
190
191			`.section __ex_table,"a"`
192			`PTR 1b,bad_stack`
193			`PTR 2b,bad_stack`
194			`.previous`
195
196			`/* ------------------------------------------------------------------------ */`
197
198			`/*`
199			`* The stackpointer for a call with more than 4 arguments is bad.`
200			`* We probably should handle this case a bit more drastic.`
201			`*/`
202			`bad_stack:`
203			`negu v0 # error`
204			`sw v0, PT_R0(sp)`
205			`sw v0, PT_R2(sp)`
206			`li t0, 1 # set error flag`
207			`sw t0, PT_R7(sp)`
208			`j fast_ret_from_sys_call`
209
210			`/* ------------------------------------------------------------------------ */`
211
212			`/*`
213			`* The system call does not exist in this kernel`
214			`*/`
215			`illegal_syscall:`
216			`lw t0, TASK_PTRACE($28) # syscall tracing enabled?`
217			`andi t0, _PT_TRACESYS`
218			`beqz t0, 1f`
219
220			`SAVE_STATIC`
221			`jal syscall_trace`
222			`li t0, _PT_TRACESYS`
223
224			`1: li v0, ENOSYS # error`
225			`sw v0, PT_R0(sp) # set flag for syscall restarting`
226			`sw v0, PT_R2(sp)`
227			`li t1, 1 # set error flag`
228			`sw t1, PT_R7(sp)`
229			`bnez t0, tracesys_exit`
230
231			`j fast_ret_from_sys_call`
232			`END(handle_sys)`
233
234			`LEAF(mips_atomic_set)`
235			`andi v0, a1, 3 # must be word aligned`
236			`bnez v0, bad_alignment`
237
238			`lw v1, THREAD_CURDS($28) # in legal address range?`
239			`addiu a0, a1, 4`
240			`or a0, a0, a1`
241			`and a0, a0, v1`
242			`bltz a0, bad_address`
243
244			`#ifdef CONFIG_CPU_HAS_LLSC`
245			`/* Ok, this is the ll/sc case. World is sane :-) */`
246			`1: ll v0, (a1)`
247			`move a0, a2`
248			`2: sc a0, (a1)`
249			`beqz a0, 1b`
250
251			`.section __ex_table,"a"`
252			`PTR 1b, bad_stack`
253			`PTR 2b, bad_stack`
254			`.previous`
255			`#else`
256			`sw a1, 16(sp)`
257			`sw a2, 20(sp)`
258
259			`move a0, sp`
260			`move a2, a1`
261			`li a1, 1`
262			`jal do_page_fault`
263
264			`lw a1, 16(sp)`
265			`lw a2, 20(sp)`
266
267			`/*`
268			`* At this point the page should be readable and writable unless`
269			`* there was no more memory available.`
270			`*/`
271			`1: lw v0, (a1)`
272			`2: sw a2, (a1)`
273
274			`.section __ex_table,"a"`
275			`PTR 1b, no_mem`
276			`PTR 2b, no_mem`
277			`.previous`
278			`#endif`
279
280			`sw zero, PT_R7(sp) # success`
281			`sw v0, PT_R2(sp) # result`
282
283			`/* Success, so skip usual error handling garbage. */`
284			`lw t0, TASK_PTRACE($28) # syscall tracing enabled?`
285			`andi t0, _PT_TRACESYS`
286			`beqz t0, fast_ret_from_sys_call`
287
288			`SAVE_STATIC`
289			`jal syscall_trace`
290			`j static_ret_from_sys_call`
291
292			`no_mem: li v0, -ENOMEM`
293			`jr ra`
294
295			`bad_address:`
296			`li v0, -EFAULT`
297			`jr ra`
298
299			`bad_alignment:`
300			`li v0, -EINVAL`
301			`jr ra`
302			`END(mips_atomic_set)`
303
304			`LEAF(sys_sysmips)`
305			`beq a0, MIPS_ATOMIC_SET, mips_atomic_set`
306			`j _sys_sysmips`
307			`END(sys_sysmips)`
308
309			`LEAF(sys_syscall)`
310			`lw t0, PT_R29(sp) # user sp`
311
312			`sltu v0, a0, __NR_O32_Linux + __NR_O32_Linux_syscalls + 1`
313			`beqz v0, enosys`
314
315			`sll v0, a0, 2`
316			`la v1, sys_syscall`
317			`lw t2, sys_call_table(v0) # function pointer`
318			`lbu t4, sys_narg_table(a0) # number of arguments`
319
320			`li v0, -EINVAL`
321			`beq t2, v1, out # do not recurse`
322
323			`beqz t2, enosys # null function pointer?`
324
325			`andi v0, t0, 0x3 # unaligned stack pointer?`
326			`bnez v0, sigsegv`
327
328			`addu v0, t0, 16 # v0 = usp + 16`
329			`addu t1, v0, 12 # 3 32-bit arguments`
330			`lw v1, THREAD_CURDS($28)`
331			`or v0, v0, t1`
332			`and v1, v1, v0`
333			`bltz v1, efault`
334
335			`move a0, a1 # shift argument registers`
336			`move a1, a2`
337			`move a2, a3`
338
339			`1: lw a3, 16(t0)`
340			`2: lw t3, 20(t0)`
341			`3: lw t4, 24(t0)`
342
343			`.section __ex_table, "a"`
344			`.word 1b, efault`
345			`.word 2b, efault`
346			`.word 3b, efault`
347			`.previous`
348
349			`sw t3, 16(sp) # put into new stackframe`
350			`sw t4, 20(sp)`
351
352			`bnez t4, 1f # zero arguments?`
353			`addu a0, sp, 32 # then pass sp in a0`
354			`1:`
355
356			`sw t3, 16(sp)`
357			`sw v1, 20(sp)`
358			`jr t2`
359			`/* Unreached */`
360
361			`enosys: li v0, -ENOSYS`
362			`b out`
363
364			`sigsegv:`
365			`li a0, _SIGSEGV`
366			`move a1, $28`
367			`jal force_sig`
368			`/* Fall through */`
369
370			`efault: li v0, -EFAULT`
371
372			`out: jr ra`
373			`END(sys_syscall)`