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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [sparc/] [kernel/] [rirq.S] - Blame information for rev 1765

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/* rirq.S: Needed to return from an interrupt on SMP with no
 *         locks held or released.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 */
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
 
#define t_psr     l0
#define t_pc      l1
#define t_npc     l2
#define t_wim     l3
#define twin_tmp1 l4
#define twin_tmp2 l5
#define twin_tmp3 l6
 
        /* 7 WINDOW SPARC PATCH INSTRUCTIONS */
        .globl  rirq_7win_patch1, rirq_7win_patch2, rirq_7win_patch3
        .globl  rirq_7win_patch4, rirq_7win_patch5
rirq_7win_patch1:       srl     %t_wim, 0x6, %twin_tmp2
rirq_7win_patch2:       and     %twin_tmp2, 0x7f, %twin_tmp2
rirq_7win_patch3:       srl     %g1, 7, %g2
rirq_7win_patch4:       srl     %g2, 6, %g2
rirq_7win_patch5:       and     %g1, 0x7f, %g1
        /* END OF PATCH INSTRUCTIONS */
 
        .globl  ret_irq_entry, rirq_patch1, rirq_patch2
        .globl  rirq_patch3, rirq_patch4, rirq_patch5
ret_irq_entry:
        ld      [%sp + REGWIN_SZ + PT_PSR], %t_psr
        andcc   %t_psr, PSR_PS, %g0
        bne     ret_irq_kernel
         nop
 
ret_irq_user:
        wr      %t_psr, 0x0, %psr
        WRITE_PAUSE
 
        LOAD_CURRENT(twin_tmp2, twin_tmp1)
        ld      [%twin_tmp2 + THREAD_W_SAVED], %twin_tmp1
        orcc    %g0, %twin_tmp1, %g0
        be      ret_irq_nobufwins
         nop
 
        /* User has toasty windows, must grab klock. */
        ENTER_SYSCALL
 
        wr      %t_psr, PSR_ET, %psr
        WRITE_PAUSE
 
        mov     1, %o1
        call    C_LABEL(try_to_clear_window_buffer)
         add    %sp, REGWIN_SZ, %o0
 
        /* We have klock, so we must return just like a normal trap. */
        b       ret_trap_entry
         nop
 
ret_irq_nobufwins:
        /* Load up the user's out registers so we can pull
         * a window from the stack, if necessary.
         */
        LOAD_PT_INS(sp)
 
        /* If there are already live user windows in the
         * set we can return from trap safely.
         */
        ld      [%twin_tmp2 + THREAD_UMASK], %twin_tmp1
        orcc    %g0, %twin_tmp1, %g0
        bne     ret_irq_userwins_ok
         nop
 
                /* Calculate new %wim, we have to pull a register
                 * window from the users stack.
                 */
ret_irq_pull_one_window:
                rd      %wim, %t_wim
                sll     %t_wim, 0x1, %twin_tmp1
rirq_patch1:    srl     %t_wim, 0x7, %twin_tmp2
                or      %twin_tmp2, %twin_tmp1, %twin_tmp2
rirq_patch2:    and     %twin_tmp2, 0xff, %twin_tmp2
 
                wr      %twin_tmp2, 0x0, %wim
                WRITE_PAUSE
 
                                /* Here comes the architecture specific
                                 * branch to the user stack checking routine
                                 * for return from traps.
                                 */
                                .globl  C_LABEL(rirq_mmu_patchme)
C_LABEL(rirq_mmu_patchme):      b       C_LABEL(sun4c_reti_stackchk)
                                 andcc  %fp, 0x7, %g0
 
ret_irq_userwins_ok:
        LOAD_PT_PRIV(sp, t_psr, t_pc, t_npc)
        or      %t_pc, %t_npc, %g2
        andcc   %g2, 0x3, %g0
        bne     ret_irq_unaligned_pc
         nop
 
        LOAD_PT_YREG(sp, g1)
        LOAD_PT_GLOBALS(sp)
 
        wr      %t_psr, 0x0, %psr
        WRITE_PAUSE
 
        jmp     %t_pc
        rett    %t_npc
 
ret_irq_unaligned_pc:
        add     %sp, REGWIN_SZ, %o0
        ld      [%sp + REGWIN_SZ + PT_PC], %o1
        ld      [%sp + REGWIN_SZ + PT_NPC], %o2
        ld      [%sp + REGWIN_SZ + PT_PSR], %o3
 
        wr      %t_wim, 0x0, %wim               ! or else...
        WRITE_PAUSE
 
        /* User has unaligned crap, must grab klock. */
        ENTER_SYSCALL
 
        wr      %t_psr, PSR_ET, %psr
        WRITE_PAUSE
 
        call    C_LABEL(do_memaccess_unaligned)
         nop
 
        /* We have klock, so we must return just like a normal trap. */
        b       ret_trap_entry
         nop
 
ret_irq_kernel:
        wr      %t_psr, 0x0, %psr
        WRITE_PAUSE
 
                /* Will the rett land us in the invalid window? */
                mov     2, %g1
                sll     %g1, %t_psr, %g1
rirq_patch3:    srl     %g1, 8, %g2
                or      %g1, %g2, %g1
                rd      %wim, %g2
                andcc   %g2, %g1, %g0
                be      1f              ! Nope, just return from the trap
                 nop
 
                /* We have to grab a window before returning. */
                sll     %g2, 0x1, %g1
rirq_patch4:    srl     %g2, 7,  %g2
                or      %g1, %g2, %g1
rirq_patch5:    and     %g1, 0xff, %g1
 
        wr      %g1, 0x0, %wim
        WRITE_PAUSE
 
        restore %g0, %g0, %g0
        LOAD_WINDOW(sp)
        save    %g0, %g0, %g0
 
        /* Reload the entire frame in case this is from a
         * kernel system call or whatever...
         */
1:
        LOAD_PT_ALL(sp, t_psr, t_pc, t_npc, g1)
 
        wr      %t_psr, 0x0, %psr
        WRITE_PAUSE
 
        jmp     %t_pc
        rett    %t_npc
 
ret_irq_user_stack_is_bolixed:
        wr      %t_wim, 0x0, %wim
        WRITE_PAUSE
 
        /* User has a toasty window, must grab klock. */
        ENTER_SYSCALL
 
        wr      %t_psr, PSR_ET, %psr
        WRITE_PAUSE
 
        call    C_LABEL(window_ret_fault)
         add    %sp, REGWIN_SZ, %o0
 
        /* We have klock, so we must return just like a normal trap. */
        b       ret_trap_entry
         nop
 
        .globl  C_LABEL(sun4c_reti_stackchk)
C_LABEL(sun4c_reti_stackchk):
        be      1f
         and    %fp, 0xfff, %g1         ! delay slot
 
        b       ret_irq_user_stack_is_bolixed
         nop
 
        /* See if we have to check the sanity of one page or two */
1:
        add     %g1, 0x38, %g1
        sra     %fp, 29, %g2
        add     %g2, 0x1, %g2
        andncc  %g2, 0x1, %g0
        be      1f
         andncc %g1, 0xff8, %g0
 
        /* %sp is in vma hole, yuck */
        b       ret_irq_user_stack_is_bolixed
         nop
 
1:
        be      sun4c_reti_onepage      /* Only one page to check */
         lda    [%fp] ASI_PTE, %g2
 
sun4c_reti_twopages:
        add     %fp, 0x38, %g1
        sra     %g1, 29, %g2
        add     %g2, 0x1, %g2
        andncc  %g2, 0x1, %g0
        be      1f
         lda    [%g1] ASI_PTE, %g2
 
        /* Second page is in vma hole */
        b       ret_irq_user_stack_is_bolixed
         nop
 
1:
        srl     %g2, 29, %g2
        andcc   %g2, 0x4, %g0
        bne     sun4c_reti_onepage
         lda    [%fp] ASI_PTE, %g2
 
        /* Second page has bad perms */
        b       ret_irq_user_stack_is_bolixed
         nop
 
sun4c_reti_onepage:
        srl     %g2, 29, %g2
        andcc   %g2, 0x4, %g0
        bne     1f
         nop
 
        /* A page had bad page permissions, losing... */
        b       ret_irq_user_stack_is_bolixed
         nop
 
        /* Whee, things are ok, load the window and continue. */
1:
        restore %g0, %g0, %g0
 
        LOAD_WINDOW(sp)
 
        save    %g0, %g0, %g0
        b       ret_irq_userwins_ok
         nop
 
        .globl  C_LABEL(srmmu_reti_stackchk)
C_LABEL(srmmu_reti_stackchk):
        bne     ret_irq_user_stack_is_bolixed
         sethi  %hi(KERNBASE), %g1
        cmp     %g1, %fp
        bleu    ret_irq_user_stack_is_bolixed
         mov    AC_M_SFSR, %g1
        lda     [%g1] ASI_M_MMUREGS, %g0
 
        lda     [%g0] ASI_M_MMUREGS, %g1
        or      %g1, 0x2, %g1
        sta     %g1, [%g0] ASI_M_MMUREGS
 
        restore %g0, %g0, %g0
 
        LOAD_WINDOW(sp)
 
        save    %g0, %g0, %g0
 
        andn    %g1, 0x2, %g1
        sta     %g1, [%g0] ASI_M_MMUREGS
 
        mov     AC_M_SFAR, %g2
        lda     [%g2] ASI_M_MMUREGS, %g2
 
        mov     AC_M_SFSR, %g1
        lda     [%g1] ASI_M_MMUREGS, %g1
        andcc   %g1, 0x2, %g0
        bne     ret_irq_user_stack_is_bolixed
         nop
 
        b       ret_irq_userwins_ok
         nop

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [sparc/] [kernel/] [rirq.S] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	199	simons	`/* rirq.S: Needed to return from an interrupt on SMP with no`
2			`* locks held or released.`
3			`*`
4			`* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)`
5			`*/`
6
7			`#include`
8			`#include`
9			`#include`
10			`#include`
11			`#include`
12			`#include`
13			`#include`
14			`#include`
15			`#include`
16
17			`#define t_psr l0`
18			`#define t_pc l1`
19			`#define t_npc l2`
20			`#define t_wim l3`
21			`#define twin_tmp1 l4`
22			`#define twin_tmp2 l5`
23			`#define twin_tmp3 l6`
24
25			`/* 7 WINDOW SPARC PATCH INSTRUCTIONS */`
26			`.globl rirq_7win_patch1, rirq_7win_patch2, rirq_7win_patch3`
27			`.globl rirq_7win_patch4, rirq_7win_patch5`
28			`rirq_7win_patch1: srl %t_wim, 0x6, %twin_tmp2`
29			`rirq_7win_patch2: and %twin_tmp2, 0x7f, %twin_tmp2`
30			`rirq_7win_patch3: srl %g1, 7, %g2`
31			`rirq_7win_patch4: srl %g2, 6, %g2`
32			`rirq_7win_patch5: and %g1, 0x7f, %g1`
33			`/* END OF PATCH INSTRUCTIONS */`
34
35			`.globl ret_irq_entry, rirq_patch1, rirq_patch2`
36			`.globl rirq_patch3, rirq_patch4, rirq_patch5`
37			`ret_irq_entry:`
38			`ld [%sp + REGWIN_SZ + PT_PSR], %t_psr`
39			`andcc %t_psr, PSR_PS, %g0`
40			`bne ret_irq_kernel`
41			`nop`
42
43			`ret_irq_user:`
44			`wr %t_psr, 0x0, %psr`
45			`WRITE_PAUSE`
46
47			`LOAD_CURRENT(twin_tmp2, twin_tmp1)`
48			`ld [%twin_tmp2 + THREAD_W_SAVED], %twin_tmp1`
49			`orcc %g0, %twin_tmp1, %g0`
50			`be ret_irq_nobufwins`
51			`nop`
52
53			`/* User has toasty windows, must grab klock. */`
54			`ENTER_SYSCALL`
55
56			`wr %t_psr, PSR_ET, %psr`
57			`WRITE_PAUSE`
58
59			`mov 1, %o1`
60			`call C_LABEL(try_to_clear_window_buffer)`
61			`add %sp, REGWIN_SZ, %o0`
62
63			`/* We have klock, so we must return just like a normal trap. */`
64			`b ret_trap_entry`
65			`nop`
66
67			`ret_irq_nobufwins:`
68			`/* Load up the user's out registers so we can pull`
69			`* a window from the stack, if necessary.`
70			`*/`
71			`LOAD_PT_INS(sp)`
72
73			`/* If there are already live user windows in the`
74			`* set we can return from trap safely.`
75			`*/`
76			`ld [%twin_tmp2 + THREAD_UMASK], %twin_tmp1`
77			`orcc %g0, %twin_tmp1, %g0`
78			`bne ret_irq_userwins_ok`
79			`nop`
80
81			`/* Calculate new %wim, we have to pull a register`
82			`* window from the users stack.`
83			`*/`
84			`ret_irq_pull_one_window:`
85			`rd %wim, %t_wim`
86			`sll %t_wim, 0x1, %twin_tmp1`
87			`rirq_patch1: srl %t_wim, 0x7, %twin_tmp2`
88			`or %twin_tmp2, %twin_tmp1, %twin_tmp2`
89			`rirq_patch2: and %twin_tmp2, 0xff, %twin_tmp2`
90
91			`wr %twin_tmp2, 0x0, %wim`
92			`WRITE_PAUSE`
93
94			`/* Here comes the architecture specific`
95			`* branch to the user stack checking routine`
96			`* for return from traps.`
97			`*/`
98			`.globl C_LABEL(rirq_mmu_patchme)`
99			`C_LABEL(rirq_mmu_patchme): b C_LABEL(sun4c_reti_stackchk)`
100			`andcc %fp, 0x7, %g0`
101
102			`ret_irq_userwins_ok:`
103			`LOAD_PT_PRIV(sp, t_psr, t_pc, t_npc)`
104			`or %t_pc, %t_npc, %g2`
105			`andcc %g2, 0x3, %g0`
106			`bne ret_irq_unaligned_pc`
107			`nop`
108
109			`LOAD_PT_YREG(sp, g1)`
110			`LOAD_PT_GLOBALS(sp)`
111
112			`wr %t_psr, 0x0, %psr`
113			`WRITE_PAUSE`
114
115			`jmp %t_pc`
116			`rett %t_npc`
117
118			`ret_irq_unaligned_pc:`
119			`add %sp, REGWIN_SZ, %o0`
120			`ld [%sp + REGWIN_SZ + PT_PC], %o1`
121			`ld [%sp + REGWIN_SZ + PT_NPC], %o2`
122			`ld [%sp + REGWIN_SZ + PT_PSR], %o3`
123
124			`wr %t_wim, 0x0, %wim ! or else...`
125			`WRITE_PAUSE`
126
127			`/* User has unaligned crap, must grab klock. */`
128			`ENTER_SYSCALL`
129
130			`wr %t_psr, PSR_ET, %psr`
131			`WRITE_PAUSE`
132
133			`call C_LABEL(do_memaccess_unaligned)`
134			`nop`
135
136			`/* We have klock, so we must return just like a normal trap. */`
137			`b ret_trap_entry`
138			`nop`
139
140			`ret_irq_kernel:`
141			`wr %t_psr, 0x0, %psr`
142			`WRITE_PAUSE`
143
144			`/* Will the rett land us in the invalid window? */`
145			`mov 2, %g1`
146			`sll %g1, %t_psr, %g1`
147			`rirq_patch3: srl %g1, 8, %g2`
148			`or %g1, %g2, %g1`
149			`rd %wim, %g2`
150			`andcc %g2, %g1, %g0`
151			`be 1f ! Nope, just return from the trap`
152			`nop`
153
154			`/* We have to grab a window before returning. */`
155			`sll %g2, 0x1, %g1`
156			`rirq_patch4: srl %g2, 7, %g2`
157			`or %g1, %g2, %g1`
158			`rirq_patch5: and %g1, 0xff, %g1`
159
160			`wr %g1, 0x0, %wim`
161			`WRITE_PAUSE`
162
163			`restore %g0, %g0, %g0`
164			`LOAD_WINDOW(sp)`
165			`save %g0, %g0, %g0`
166
167			`/* Reload the entire frame in case this is from a`
168			`* kernel system call or whatever...`
169			`*/`
170			`1:`
171			`LOAD_PT_ALL(sp, t_psr, t_pc, t_npc, g1)`
172
173			`wr %t_psr, 0x0, %psr`
174			`WRITE_PAUSE`
175
176			`jmp %t_pc`
177			`rett %t_npc`
178
179			`ret_irq_user_stack_is_bolixed:`
180			`wr %t_wim, 0x0, %wim`
181			`WRITE_PAUSE`
182
183			`/* User has a toasty window, must grab klock. */`
184			`ENTER_SYSCALL`
185
186			`wr %t_psr, PSR_ET, %psr`
187			`WRITE_PAUSE`
188
189			`call C_LABEL(window_ret_fault)`
190			`add %sp, REGWIN_SZ, %o0`
191
192			`/* We have klock, so we must return just like a normal trap. */`
193			`b ret_trap_entry`
194			`nop`
195
196			`.globl C_LABEL(sun4c_reti_stackchk)`
197			`C_LABEL(sun4c_reti_stackchk):`
198			`be 1f`
199			`and %fp, 0xfff, %g1 ! delay slot`
200
201			`b ret_irq_user_stack_is_bolixed`
202			`nop`
203
204			`/* See if we have to check the sanity of one page or two */`
205			`1:`
206			`add %g1, 0x38, %g1`
207			`sra %fp, 29, %g2`
208			`add %g2, 0x1, %g2`
209			`andncc %g2, 0x1, %g0`
210			`be 1f`
211			`andncc %g1, 0xff8, %g0`
212
213			`/* %sp is in vma hole, yuck */`
214			`b ret_irq_user_stack_is_bolixed`
215			`nop`
216
217			`1:`
218			`be sun4c_reti_onepage /* Only one page to check */`
219			`lda [%fp] ASI_PTE, %g2`
220
221			`sun4c_reti_twopages:`
222			`add %fp, 0x38, %g1`
223			`sra %g1, 29, %g2`
224			`add %g2, 0x1, %g2`
225			`andncc %g2, 0x1, %g0`
226			`be 1f`
227			`lda [%g1] ASI_PTE, %g2`
228
229			`/* Second page is in vma hole */`
230			`b ret_irq_user_stack_is_bolixed`
231			`nop`
232
233			`1:`
234			`srl %g2, 29, %g2`
235			`andcc %g2, 0x4, %g0`
236			`bne sun4c_reti_onepage`
237			`lda [%fp] ASI_PTE, %g2`
238
239			`/* Second page has bad perms */`
240			`b ret_irq_user_stack_is_bolixed`
241			`nop`
242
243			`sun4c_reti_onepage:`
244			`srl %g2, 29, %g2`
245			`andcc %g2, 0x4, %g0`
246			`bne 1f`
247			`nop`
248
249			`/* A page had bad page permissions, losing... */`
250			`b ret_irq_user_stack_is_bolixed`
251			`nop`
252
253			`/* Whee, things are ok, load the window and continue. */`
254			`1:`
255			`restore %g0, %g0, %g0`
256
257			`LOAD_WINDOW(sp)`
258
259			`save %g0, %g0, %g0`
260			`b ret_irq_userwins_ok`
261			`nop`
262
263			`.globl C_LABEL(srmmu_reti_stackchk)`
264			`C_LABEL(srmmu_reti_stackchk):`
265			`bne ret_irq_user_stack_is_bolixed`
266			`sethi %hi(KERNBASE), %g1`
267			`cmp %g1, %fp`
268			`bleu ret_irq_user_stack_is_bolixed`
269			`mov AC_M_SFSR, %g1`
270			`lda [%g1] ASI_M_MMUREGS, %g0`
271
272			`lda [%g0] ASI_M_MMUREGS, %g1`
273			`or %g1, 0x2, %g1`
274			`sta %g1, [%g0] ASI_M_MMUREGS`
275
276			`restore %g0, %g0, %g0`
277
278			`LOAD_WINDOW(sp)`
279
280			`save %g0, %g0, %g0`
281
282			`andn %g1, 0x2, %g1`
283			`sta %g1, [%g0] ASI_M_MMUREGS`
284
285			`mov AC_M_SFAR, %g2`
286			`lda [%g2] ASI_M_MMUREGS, %g2`
287
288			`mov AC_M_SFSR, %g1`
289			`lda [%g1] ASI_M_MMUREGS, %g1`
290			`andcc %g1, 0x2, %g0`
291			`bne ret_irq_user_stack_is_bolixed`
292			`nop`
293
294			`b ret_irq_userwins_ok`
295			`nop`