2 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
4 * kernel entry points (interruptions, system call wrappers)
5 * Copyright (C) 1999,2000 Philipp Rumpf
6 * Copyright (C) 1999 SuSE GmbH Nuernberg
7 * Copyright (C) 2000 Hewlett-Packard (John Marvin)
8 * Copyright (C) 1999 Hewlett-Packard (Frank Rowand)
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <linux/config.h>
26 #include <asm/asm-offsets.h>
28 /* we have the following possibilities to act on an interruption:
29 * - handle in assembly and use shadowed registers only
30 * - save registers to kernel stack and handle in assembly or C */
34 #include <asm/assembly.h> /* for LDREG/STREG defines */
35 #include <asm/pgtable.h>
36 #include <asm/signal.h>
37 #include <asm/unistd.h>
38 #include <asm/thread_info.h>
54 .import pa_dbit_lock,data
56 /* space_to_prot macro creates a prot id from a space id */
58 #if (SPACEID_SHIFT) == 0
59 .macro space_to_prot spc prot
60 depd,z \spc,62,31,\prot
63 .macro space_to_prot spc prot
64 extrd,u \spc,(64 - (SPACEID_SHIFT)),32,\prot
68 /* Switch to virtual mapping, trashing only %r1 */
71 rsm PSW_SM_I, %r0 /* barrier for "Relied upon Translation */
75 or,= %r0,%r1,%r0 /* Only save sr7 in sr3 if sr7 != 0 */
78 load32 KERNEL_PSW, %r1
80 rsm PSW_SM_QUIET,%r0 /* second "heavy weight" ctl op */
83 mtctl %r0, %cr17 /* Clear IIASQ tail */
84 mtctl %r0, %cr17 /* Clear IIASQ head */
87 mtctl %r1, %cr18 /* Set IIAOQ tail */
89 mtctl %r1, %cr18 /* Set IIAOQ head */
96 * The "get_stack" macros are responsible for determining the
101 * Already using a kernel stack, so call the
102 * get_stack_use_r30 macro to push a pt_regs structure
103 * on the stack, and store registers there.
105 * Need to set up a kernel stack, so call the
106 * get_stack_use_cr30 macro to set up a pointer
107 * to the pt_regs structure contained within the
108 * task pointer pointed to by cr30. Set the stack
109 * pointer to point to the end of the task structure.
113 * Already using a kernel stack, check to see if r30
114 * is already pointing to the per processor interrupt
115 * stack. If it is, call the get_stack_use_r30 macro
116 * to push a pt_regs structure on the stack, and store
117 * registers there. Otherwise, call get_stack_use_cr31
118 * to get a pointer to the base of the interrupt stack
119 * and push a pt_regs structure on that stack.
121 * Need to set up a kernel stack, so call the
122 * get_stack_use_cr30 macro to set up a pointer
123 * to the pt_regs structure contained within the
124 * task pointer pointed to by cr30. Set the stack
125 * pointer to point to the end of the task structure.
126 * N.B: We don't use the interrupt stack for the
127 * first interrupt from userland, because signals/
128 * resched's are processed when returning to userland,
129 * and we can sleep in those cases.
131 * Note that we use shadowed registers for temps until
132 * we can save %r26 and %r29. %r26 is used to preserve
133 * %r8 (a shadowed register) which temporarily contained
134 * either the fault type ("code") or the eirr. We need
135 * to use a non-shadowed register to carry the value over
136 * the rfir in virt_map. We use %r26 since this value winds
137 * up being passed as the argument to either do_cpu_irq_mask
138 * or handle_interruption. %r29 is used to hold a pointer
139 * the register save area, and once again, it needs to
140 * be a non-shadowed register so that it survives the rfir.
142 * N.B. TASK_SZ_ALGN and PT_SZ_ALGN include space for a stack frame.
145 .macro get_stack_use_cr30
147 /* we save the registers in the task struct */
151 LDREG TI_TASK(%r9), %r1 /* thread_info -> task_struct */
153 ldo TASK_REGS(%r9),%r9
154 STREG %r30, PT_GR30(%r9)
155 STREG %r29,PT_GR29(%r9)
156 STREG %r26,PT_GR26(%r9)
159 ldo THREAD_SZ_ALGN(%r1), %r30
162 .macro get_stack_use_r30
164 /* we put a struct pt_regs on the stack and save the registers there */
167 STREG %r30,PT_GR30(%r9)
168 ldo PT_SZ_ALGN(%r30),%r30
169 STREG %r29,PT_GR29(%r9)
170 STREG %r26,PT_GR26(%r9)
175 LDREG PT_GR1(%r29), %r1
176 LDREG PT_GR30(%r29),%r30
177 LDREG PT_GR29(%r29),%r29
180 /* default interruption handler
181 * (calls traps.c:handle_interruption) */
188 /* Interrupt interruption handler
189 * (calls irq.c:do_cpu_irq_mask) */
196 .import os_hpmc, code
200 nop /* must be a NOP, will be patched later */
201 load32 PA(os_hpmc), %r3
204 .word 0 /* checksum (will be patched) */
205 .word PA(os_hpmc) /* address of handler */
206 .word 0 /* length of handler */
210 * Performance Note: Instructions will be moved up into
211 * this part of the code later on, once we are sure
212 * that the tlb miss handlers are close to final form.
215 /* Register definitions for tlb miss handler macros */
217 va = r8 /* virtual address for which the trap occured */
218 spc = r24 /* space for which the trap occured */
223 * itlb miss interruption handler (parisc 1.1 - 32 bit)
237 * itlb miss interruption handler (parisc 2.0)
254 * naitlb miss interruption handler (parisc 1.1 - 32 bit)
256 * Note: naitlb misses will be treated
257 * as an ordinary itlb miss for now.
258 * However, note that naitlb misses
259 * have the faulting address in the
263 .macro naitlb_11 code
268 /* FIXME: If user causes a naitlb miss, the priv level may not be in
269 * lower bits of va, where the itlb miss handler is expecting them
277 * naitlb miss interruption handler (parisc 2.0)
279 * Note: naitlb misses will be treated
280 * as an ordinary itlb miss for now.
281 * However, note that naitlb misses
282 * have the faulting address in the
286 .macro naitlb_20 code
295 /* FIXME: If user causes a naitlb miss, the priv level may not be in
296 * lower bits of va, where the itlb miss handler is expecting them
304 * dtlb miss interruption handler (parisc 1.1 - 32 bit)
318 * dtlb miss interruption handler (parisc 2.0)
335 /* nadtlb miss interruption handler (parisc 1.1 - 32 bit) */
337 .macro nadtlb_11 code
347 /* nadtlb miss interruption handler (parisc 2.0) */
349 .macro nadtlb_20 code
364 * dirty bit trap interruption handler (parisc 1.1 - 32 bit)
378 * dirty bit trap interruption handler (parisc 2.0)
394 /* The following are simple 32 vs 64 bit instruction
395 * abstractions for the macros */
396 .macro EXTR reg1,start,length,reg2
398 extrd,u \reg1,32+\start,\length,\reg2
400 extrw,u \reg1,\start,\length,\reg2
404 .macro DEP reg1,start,length,reg2
406 depd \reg1,32+\start,\length,\reg2
408 depw \reg1,\start,\length,\reg2
412 .macro DEPI val,start,length,reg
414 depdi \val,32+\start,\length,\reg
416 depwi \val,\start,\length,\reg
420 /* In LP64, the space contains part of the upper 32 bits of the
421 * fault. We have to extract this and place it in the va,
422 * zeroing the corresponding bits in the space register */
423 .macro space_adjust spc,va,tmp
425 extrd,u \spc,63,SPACEID_SHIFT,\tmp
426 depd %r0,63,SPACEID_SHIFT,\spc
427 depd \tmp,31,SPACEID_SHIFT,\va
431 .import swapper_pg_dir,code
433 /* Get the pgd. For faults on space zero (kernel space), this
434 * is simply swapper_pg_dir. For user space faults, the
435 * pgd is stored in %cr25 */
436 .macro get_pgd spc,reg
437 ldil L%PA(swapper_pg_dir),\reg
438 ldo R%PA(swapper_pg_dir)(\reg),\reg
439 or,COND(=) %r0,\spc,%r0
444 space_check(spc,tmp,fault)
446 spc - The space we saw the fault with.
447 tmp - The place to store the current space.
448 fault - Function to call on failure.
450 Only allow faults on different spaces from the
451 currently active one if we're the kernel
454 .macro space_check spc,tmp,fault
456 or,COND(<>) %r0,\spc,%r0 /* user may execute gateway page
457 * as kernel, so defeat the space
460 or,COND(=) %r0,\tmp,%r0 /* nullify if executing as kernel */
461 cmpb,COND(<>),n \tmp,\spc,\fault
464 /* Look up a PTE in a 2-Level scheme (faulting at each
465 * level if the entry isn't present
467 * NOTE: we use ldw even for LP64, since the short pointers
468 * can address up to 1TB
470 .macro L2_ptep pmd,pte,index,va,fault
472 EXTR \va,31-ASM_PMD_SHIFT,ASM_BITS_PER_PMD,\index
474 EXTR \va,31-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
476 DEP %r0,31,PAGE_SHIFT,\pmd /* clear offset */
478 ldw,s \index(\pmd),\pmd
479 bb,>=,n \pmd,_PxD_PRESENT_BIT,\fault
480 DEP %r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */
483 shld %r9,PxD_VALUE_SHIFT,\pmd
485 shlw %r9,PxD_VALUE_SHIFT,\pmd
487 EXTR \va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index
488 DEP %r0,31,PAGE_SHIFT,\pmd /* clear offset */
489 shladd \index,BITS_PER_PTE_ENTRY,\pmd,\pmd
490 LDREG %r0(\pmd),\pte /* pmd is now pte */
491 bb,>=,n \pte,_PAGE_PRESENT_BIT,\fault
494 /* Look up PTE in a 3-Level scheme.
496 * Here we implement a Hybrid L2/L3 scheme: we allocate the
497 * first pmd adjacent to the pgd. This means that we can
498 * subtract a constant offset to get to it. The pmd and pgd
499 * sizes are arranged so that a single pmd covers 4GB (giving
500 * a full LP64 process access to 8TB) so our lookups are
501 * effectively L2 for the first 4GB of the kernel (i.e. for
502 * all ILP32 processes and all the kernel for machines with
503 * under 4GB of memory) */
504 .macro L3_ptep pgd,pte,index,va,fault
505 extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
507 extrd,u,*= \va,31,32,%r0
508 ldw,s \index(\pgd),\pgd
509 extrd,u,*= \va,31,32,%r0
510 bb,>=,n \pgd,_PxD_PRESENT_BIT,\fault
511 extrd,u,*= \va,31,32,%r0
512 shld \pgd,PxD_VALUE_SHIFT,\index
513 extrd,u,*= \va,31,32,%r0
515 extrd,u,*<> \va,31,32,%r0
516 ldo ASM_PGD_PMD_OFFSET(\pgd),\pgd
517 L2_ptep \pgd,\pte,\index,\va,\fault
520 /* Set the _PAGE_ACCESSED bit of the PTE. Be clever and
521 * don't needlessly dirty the cache line if it was already set */
522 .macro update_ptep ptep,pte,tmp,tmp1
523 ldi _PAGE_ACCESSED,\tmp1
525 and,COND(<>) \tmp1,\pte,%r0
529 /* Set the dirty bit (and accessed bit). No need to be
530 * clever, this is only used from the dirty fault */
531 .macro update_dirty ptep,pte,tmp
532 ldi _PAGE_ACCESSED|_PAGE_DIRTY,\tmp
537 /* Convert the pte and prot to tlb insertion values. How
538 * this happens is quite subtle, read below */
539 .macro make_insert_tlb spc,pte,prot
540 space_to_prot \spc \prot /* create prot id from space */
541 /* The following is the real subtlety. This is depositing
542 * T <-> _PAGE_REFTRAP
544 * B <-> _PAGE_DMB (memory break)
546 * Then incredible subtlety: The access rights are
547 * _PAGE_GATEWAY _PAGE_EXEC _PAGE_READ
548 * See 3-14 of the parisc 2.0 manual
550 * Finally, _PAGE_READ goes in the top bit of PL1 (so we
551 * trigger an access rights trap in user space if the user
552 * tries to read an unreadable page */
555 /* PAGE_USER indicates the page can be read with user privileges,
556 * so deposit X1|11 to PL1|PL2 (remember the upper bit of PL1
557 * contains _PAGE_READ */
558 extrd,u,*= \pte,_PAGE_USER_BIT+32,1,%r0
560 /* If we're a gateway page, drop PL2 back to zero for promotion
561 * to kernel privilege (so we can execute the page as kernel).
562 * Any privilege promotion page always denys read and write */
563 extrd,u,*= \pte,_PAGE_GATEWAY_BIT+32,1,%r0
564 depd %r0,11,2,\prot /* If Gateway, Set PL2 to 0 */
566 /* Get rid of prot bits and convert to page addr for iitlbt */
568 depd %r0,63,PAGE_SHIFT,\pte
569 extrd,u \pte,56,32,\pte
572 /* Identical macro to make_insert_tlb above, except it
573 * makes the tlb entry for the differently formatted pa11
574 * insertion instructions */
575 .macro make_insert_tlb_11 spc,pte,prot
576 zdep \spc,30,15,\prot
578 extru,= \pte,_PAGE_NO_CACHE_BIT,1,%r0
580 extru,= \pte,_PAGE_USER_BIT,1,%r0
581 depi 7,11,3,\prot /* Set for user space (1 rsvd for read) */
582 extru,= \pte,_PAGE_GATEWAY_BIT,1,%r0
583 depi 0,11,2,\prot /* If Gateway, Set PL2 to 0 */
585 /* Get rid of prot bits and convert to page addr for iitlba */
588 extru \pte,24,25,\pte
592 /* This is for ILP32 PA2.0 only. The TLB insertion needs
593 * to extend into I/O space if the address is 0xfXXXXXXX
594 * so we extend the f's into the top word of the pte in
596 .macro f_extend pte,tmp
597 extrd,s \pte,42,4,\tmp
599 extrd,s \pte,63,25,\pte
602 /* The alias region is an 8MB aligned 16MB to do clear and
603 * copy user pages at addresses congruent with the user
606 * To use the alias page, you set %r26 up with the to TLB
607 * entry (identifying the physical page) and %r23 up with
608 * the from tlb entry (or nothing if only a to entry---for
609 * clear_user_page_asm) */
610 .macro do_alias spc,tmp,tmp1,va,pte,prot,fault
611 cmpib,COND(<>),n 0,\spc,\fault
612 ldil L%(TMPALIAS_MAP_START),\tmp
613 #if defined(__LP64__) && (TMPALIAS_MAP_START >= 0x80000000)
614 /* on LP64, ldi will sign extend into the upper 32 bits,
615 * which is behaviour we don't want */
620 cmpb,COND(<>),n \tmp,\tmp1,\fault
621 ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),\prot
622 depd,z \prot,8,7,\prot
624 * OK, it is in the temp alias region, check whether "from" or "to".
625 * Check "subtle" note in pacache.S re: r23/r26.
628 extrd,u,*= \va,41,1,%r0
630 extrw,u,= \va,9,1,%r0
632 or,COND(tr) %r23,%r0,\pte
638 * Align fault_vector_20 on 4K boundary so that both
639 * fault_vector_11 and fault_vector_20 are on the
640 * same page. This is only necessary as long as we
641 * write protect the kernel text, which we may stop
642 * doing once we use large page translations to cover
643 * the static part of the kernel address space.
646 .export fault_vector_20
653 /* First vector is invalid (0) */
654 .ascii "cows can fly"
696 .export fault_vector_11
701 /* First vector is invalid (0) */
702 .ascii "cows can fly"
744 .import handle_interruption,code
745 .import do_cpu_irq_mask,code
748 * r26 = function to be called
749 * r25 = argument to pass in
750 * r24 = flags for do_fork()
752 * Kernel threads don't ever return, so they don't need
753 * a true register context. We just save away the arguments
754 * for copy_thread/ret_ to properly set up the child.
757 #define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */
758 #define CLONE_UNTRACED 0x00800000
760 .export __kernel_thread, code
763 STREG %r2, -RP_OFFSET(%r30)
766 ldo PT_SZ_ALGN(%r30),%r30
768 /* Yo, function pointers in wide mode are little structs... -PB */
770 STREG %r2, PT_GR27(%r1) /* Store childs %dp */
773 STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */
774 copy %r0, %r22 /* user_tid */
776 STREG %r26, PT_GR26(%r1) /* Store function & argument for child */
777 STREG %r25, PT_GR25(%r1)
778 ldil L%CLONE_UNTRACED, %r26
779 ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */
780 or %r26, %r24, %r26 /* will have kernel mappings. */
781 ldi 1, %r25 /* stack_start, signals kernel thread */
782 stw %r0, -52(%r30) /* user_tid */
784 ldo -16(%r30),%r29 /* Reference param save area */
787 copy %r1, %r24 /* pt_regs */
789 /* Parent Returns here */
791 LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2
792 ldo -PT_SZ_ALGN(%r30), %r30
799 * copy_thread moved args from temp save area set up above
800 * into task save area.
803 .export ret_from_kernel_thread
804 ret_from_kernel_thread:
806 /* Call schedule_tail first though */
807 BL schedule_tail, %r2
810 LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1
811 LDREG TASK_PT_GR25(%r1), %r26
813 LDREG TASK_PT_GR27(%r1), %r27
814 LDREG TASK_PT_GR22(%r1), %r22
816 LDREG TASK_PT_GR26(%r1), %r1
821 ldo -16(%r30),%r29 /* Reference param save area */
822 loadgp /* Thread could have been in a module */
827 .import sys_execve, code
828 .export __execve, code
832 ldo PT_SZ_ALGN(%r30), %r30
833 STREG %r26, PT_GR26(%r16)
834 STREG %r25, PT_GR25(%r16)
835 STREG %r24, PT_GR24(%r16)
837 ldo -16(%r30),%r29 /* Reference param save area */
842 cmpib,=,n 0,%r28,intr_return /* forward */
844 /* yes, this will trap and die. */
853 * struct task_struct *_switch_to(struct task_struct *prev,
854 * struct task_struct *next)
856 * switch kernel stacks and return prev */
857 .export _switch_to, code
859 STREG %r2, -RP_OFFSET(%r30)
863 load32 _switch_to_ret, %r2
865 STREG %r2, TASK_PT_KPC(%r26)
866 LDREG TASK_PT_KPC(%r25), %r2
868 STREG %r30, TASK_PT_KSP(%r26)
869 LDREG TASK_PT_KSP(%r25), %r30
870 LDREG TASK_THREAD_INFO(%r25), %r25
875 mtctl %r0, %cr0 /* Needed for single stepping */
878 LDREG -RP_OFFSET(%r30), %r2
883 * Common rfi return path for interruptions, kernel execve, and
884 * sys_rt_sigreturn (sometimes). The sys_rt_sigreturn syscall will
885 * return via this path if the signal was received when the process
886 * was running; if the process was blocked on a syscall then the
887 * normal syscall_exit path is used. All syscalls for traced
888 * proceses exit via intr_restore.
890 * XXX If any syscalls that change a processes space id ever exit
891 * this way, then we will need to copy %sr3 in to PT_SR[3..7], and
898 .export syscall_exit_rfi
901 LDREG TI_TASK(%r16), %r16 /* thread_info -> task_struct */
902 ldo TASK_REGS(%r16),%r16
903 /* Force iaoq to userspace, as the user has had access to our current
904 * context via sigcontext. Also Filter the PSW for the same reason.
906 LDREG PT_IAOQ0(%r16),%r19
908 STREG %r19,PT_IAOQ0(%r16)
909 LDREG PT_IAOQ1(%r16),%r19
911 STREG %r19,PT_IAOQ1(%r16)
912 LDREG PT_PSW(%r16),%r19
913 load32 USER_PSW_MASK,%r1
915 load32 USER_PSW_HI_MASK,%r20
918 and %r19,%r1,%r19 /* Mask out bits that user shouldn't play with */
920 or %r19,%r1,%r19 /* Make sure default USER_PSW bits are set */
921 STREG %r19,PT_PSW(%r16)
924 * If we aren't being traced, we never saved space registers
925 * (we don't store them in the sigcontext), so set them
926 * to "proper" values now (otherwise we'll wind up restoring
927 * whatever was last stored in the task structure, which might
928 * be inconsistent if an interrupt occured while on the gateway
929 * page) Note that we may be "trashing" values the user put in
930 * them, but we don't support the the user changing them.
933 STREG %r0,PT_SR2(%r16)
935 STREG %r19,PT_SR0(%r16)
936 STREG %r19,PT_SR1(%r16)
937 STREG %r19,PT_SR3(%r16)
938 STREG %r19,PT_SR4(%r16)
939 STREG %r19,PT_SR5(%r16)
940 STREG %r19,PT_SR6(%r16)
941 STREG %r19,PT_SR7(%r16)
944 /* NOTE: Need to enable interrupts incase we schedule. */
947 /* Check for software interrupts */
949 .import irq_stat,data
954 ldw TI_CPU(%r1),%r1 /* get cpu # - int */
955 /* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) amount
956 ** irq_stat[] is defined using ____cacheline_aligned.
963 add %r19,%r20,%r19 /* now have &irq_stat[smp_processor_id()] */
964 #endif /* CONFIG_SMP */
966 LDREG IRQSTAT_SIRQ_PEND(%r19),%r20 /* hardirq.h: unsigned long */
967 cmpib,<>,n 0,%r20,intr_do_softirq /* forward */
971 /* check for reschedule */
973 LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
974 bb,<,n %r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */
979 LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_SIGPENDING */
980 bb,<,n %r19, 31-TIF_SIGPENDING, intr_do_signal /* forward */
984 ldo PT_FR31(%r29),%r1
988 /* inverse of virt_map */
990 rsm PSW_SM_QUIET,%r0 /* prepare for rfi */
993 /* Restore space id's and special cr's from PT_REGS
994 * structure pointed to by r29
998 /* IMPORTANT: rest_stack restores r29 last (we are using it)!
999 * It also restores r1 and r30.
1013 .import do_softirq,code
1017 ldo -16(%r30),%r29 /* Reference param save area */
1021 b intr_check_resched
1024 .import schedule,code
1026 /* Only do reschedule if we are returning to user space */
1027 LDREG PT_IASQ0(%r16), %r20
1028 CMPIB= 0,%r20,intr_restore /* backward */
1030 LDREG PT_IASQ1(%r16), %r20
1031 CMPIB= 0,%r20,intr_restore /* backward */
1035 ldo -16(%r30),%r29 /* Reference param save area */
1038 ldil L%intr_check_sig, %r2
1040 ldo R%intr_check_sig(%r2), %r2
1043 .import do_signal,code
1046 This check is critical to having LWS
1047 working. The IASQ is zero on the gateway
1048 page and we cannot deliver any signals until
1049 we get off the gateway page.
1051 Only do signals if we are returning to user space
1053 LDREG PT_IASQ0(%r16), %r20
1054 CMPIB= 0,%r20,intr_restore /* backward */
1056 LDREG PT_IASQ1(%r16), %r20
1057 CMPIB= 0,%r20,intr_restore /* backward */
1060 copy %r0, %r24 /* unsigned long in_syscall */
1061 copy %r16, %r25 /* struct pt_regs *regs */
1063 ldo -16(%r30),%r29 /* Reference param save area */
1067 copy %r0, %r26 /* sigset_t *oldset = NULL */
1073 * External interrupts.
1082 #if 0 /* Interrupt Stack support not working yet! */
1085 /* FIXME! depi below has hardcoded idea of interrupt stack size (32k)*/
1103 ldo PT_FR0(%r29), %r24
1108 copy %r29, %r26 /* arg0 is pt_regs */
1109 copy %r29, %r16 /* save pt_regs */
1111 ldil L%intr_return, %r2
1114 ldo -16(%r30),%r29 /* Reference param save area */
1118 ldo R%intr_return(%r2), %r2 /* return to intr_return, not here */
1121 /* Generic interruptions (illegal insn, unaligned, page fault, etc) */
1123 .export intr_save, code /* for os_hpmc */
1139 /* If this trap is a itlb miss, skip saving/adjusting isr/ior */
1142 * FIXME: 1) Use a #define for the hardwired "6" below (and in
1144 * 2) Once we start executing code above 4 Gb, we need
1145 * to adjust iasq/iaoq here in the same way we
1146 * adjust isr/ior below.
1149 CMPIB=,n 6,%r26,skip_save_ior
1152 mfctl %cr20, %r16 /* isr */
1153 nop /* serialize mfctl on PA 2.0 to avoid 4 cycle penalty */
1154 mfctl %cr21, %r17 /* ior */
1159 * If the interrupted code was running with W bit off (32 bit),
1160 * clear the b bits (bits 0 & 1) in the ior.
1161 * save_specials left ipsw value in r8 for us to test.
1163 extrd,u,*<> %r8,PSW_W_BIT,1,%r0
1167 * FIXME: This code has hardwired assumptions about the split
1168 * between space bits and offset bits. This will change
1169 * when we allow alternate page sizes.
1172 /* adjust isr/ior. */
1174 extrd,u %r16,63,7,%r1 /* get high bits from isr for ior */
1175 depd %r1,31,7,%r17 /* deposit them into ior */
1176 depdi 0,63,7,%r16 /* clear them from isr */
1178 STREG %r16, PT_ISR(%r29)
1179 STREG %r17, PT_IOR(%r29)
1186 ldo PT_FR0(%r29), %r25
1191 copy %r29, %r25 /* arg1 is pt_regs */
1193 ldo -16(%r30),%r29 /* Reference param save area */
1196 ldil L%intr_check_sig, %r2
1197 copy %r25, %r16 /* save pt_regs */
1199 b handle_interruption
1200 ldo R%intr_check_sig(%r2), %r2
1204 * Note for all tlb miss handlers:
1206 * cr24 contains a pointer to the kernel address space
1209 * cr25 contains a pointer to the current user address
1210 * space page directory.
1212 * sr3 will contain the space id of the user address space
1213 * of the current running thread while that thread is
1214 * running in the kernel.
1218 * register number allocations. Note that these are all
1219 * in the shadowed registers
1222 t0 = r1 /* temporary register 0 */
1223 va = r8 /* virtual address for which the trap occured */
1224 t1 = r9 /* temporary register 1 */
1225 pte = r16 /* pte/phys page # */
1226 prot = r17 /* prot bits */
1227 spc = r24 /* space for which the trap occured */
1228 ptp = r25 /* page directory/page table pointer */
1233 space_adjust spc,va,t0
1235 space_check spc,t0,dtlb_fault
1237 L3_ptep ptp,pte,t0,va,dtlb_check_alias_20w
1239 update_ptep ptp,pte,t0,t1
1241 make_insert_tlb spc,pte,prot
1248 dtlb_check_alias_20w:
1249 do_alias spc,t0,t1,va,pte,prot,dtlb_fault
1257 space_adjust spc,va,t0
1259 space_check spc,t0,nadtlb_fault
1261 L3_ptep ptp,pte,t0,va,nadtlb_check_flush_20w
1263 update_ptep ptp,pte,t0,t1
1265 make_insert_tlb spc,pte,prot
1272 nadtlb_check_flush_20w:
1273 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1275 /* Insert a "flush only" translation */
1280 /* Get rid of prot bits and convert to page addr for idtlbt */
1283 extrd,u pte,56,52,pte
1294 space_check spc,t0,dtlb_fault
1296 L2_ptep ptp,pte,t0,va,dtlb_check_alias_11
1298 update_ptep ptp,pte,t0,t1
1300 make_insert_tlb_11 spc,pte,prot
1302 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1305 idtlba pte,(%sr1,va)
1306 idtlbp prot,(%sr1,va)
1308 mtsp t0, %sr1 /* Restore sr1 */
1313 dtlb_check_alias_11:
1315 /* Check to see if fault is in the temporary alias region */
1317 cmpib,<>,n 0,spc,dtlb_fault /* forward */
1318 ldil L%(TMPALIAS_MAP_START),t0
1321 cmpb,<>,n t0,t1,dtlb_fault /* forward */
1322 ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),prot
1323 depw,z prot,8,7,prot
1326 * OK, it is in the temp alias region, check whether "from" or "to".
1327 * Check "subtle" note in pacache.S re: r23/r26.
1331 or,tr %r23,%r0,pte /* If "from" use "from" page */
1332 or %r26,%r0,pte /* else "to", use "to" page */
1343 space_check spc,t0,nadtlb_fault
1345 L2_ptep ptp,pte,t0,va,nadtlb_check_flush_11
1347 update_ptep ptp,pte,t0,t1
1349 make_insert_tlb_11 spc,pte,prot
1352 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1355 idtlba pte,(%sr1,va)
1356 idtlbp prot,(%sr1,va)
1358 mtsp t0, %sr1 /* Restore sr1 */
1363 nadtlb_check_flush_11:
1364 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1366 /* Insert a "flush only" translation */
1371 /* Get rid of prot bits and convert to page addr for idtlba */
1376 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1379 idtlba pte,(%sr1,va)
1380 idtlbp prot,(%sr1,va)
1382 mtsp t0, %sr1 /* Restore sr1 */
1388 space_adjust spc,va,t0
1390 space_check spc,t0,dtlb_fault
1392 L2_ptep ptp,pte,t0,va,dtlb_check_alias_20
1394 update_ptep ptp,pte,t0,t1
1396 make_insert_tlb spc,pte,prot
1405 dtlb_check_alias_20:
1406 do_alias spc,t0,t1,va,pte,prot,dtlb_fault
1416 space_check spc,t0,nadtlb_fault
1418 L2_ptep ptp,pte,t0,va,nadtlb_check_flush_20
1420 update_ptep ptp,pte,t0,t1
1422 make_insert_tlb spc,pte,prot
1431 nadtlb_check_flush_20:
1432 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1434 /* Insert a "flush only" translation */
1439 /* Get rid of prot bits and convert to page addr for idtlbt */
1442 extrd,u pte,56,32,pte
1452 * Non access misses can be caused by fdc,fic,pdc,lpa,probe and
1453 * probei instructions. We don't want to fault for these
1454 * instructions (not only does it not make sense, it can cause
1455 * deadlocks, since some flushes are done with the mmap
1456 * semaphore held). If the translation doesn't exist, we can't
1457 * insert a translation, so have to emulate the side effects
1458 * of the instruction. Since we don't insert a translation
1459 * we can get a lot of faults during a flush loop, so it makes
1460 * sense to try to do it here with minimum overhead. We only
1461 * emulate fdc,fic,pdc,probew,prober instructions whose base
1462 * and index registers are not shadowed. We defer everything
1463 * else to the "slow" path.
1466 mfctl %cr19,%r9 /* Get iir */
1468 /* PA 2.0 Arch Ref. Book pg 382 has a good description of the insn bits.
1469 Checks for fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw */
1471 /* Checks for fdc,fdce,pdc,"fic,4f" only */
1474 cmpb,<>,n %r16,%r17,nadtlb_probe_check
1475 bb,>=,n %r9,26,nadtlb_nullify /* m bit not set, just nullify */
1476 BL get_register,%r25
1477 extrw,u %r9,15,5,%r8 /* Get index register # */
1478 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1480 BL get_register,%r25
1481 extrw,u %r9,10,5,%r8 /* Get base register # */
1482 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1483 BL set_register,%r25
1484 add,l %r1,%r24,%r1 /* doesn't affect c/b bits */
1489 or %r8,%r9,%r8 /* Set PSW_N */
1496 When there is no translation for the probe address then we
1497 must nullify the insn and return zero in the target regsiter.
1498 This will indicate to the calling code that it does not have
1499 write/read privileges to this address.
1501 This should technically work for prober and probew in PA 1.1,
1502 and also probe,r and probe,w in PA 2.0
1504 WARNING: USE ONLY NON-SHADOW REGISTERS WITH PROBE INSN!
1505 THE SLOW-PATH EMULATION HAS NOT BEEN WRITTEN YET.
1511 cmpb,<>,n %r16,%r17,nadtlb_fault /* Must be probe,[rw]*/
1512 BL get_register,%r25 /* Find the target register */
1513 extrw,u %r9,31,5,%r8 /* Get target register */
1514 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1515 BL set_register,%r25
1516 copy %r0,%r1 /* Write zero to target register */
1517 b nadtlb_nullify /* Nullify return insn */
1525 * I miss is a little different, since we allow users to fault
1526 * on the gateway page which is in the kernel address space.
1529 space_adjust spc,va,t0
1531 space_check spc,t0,itlb_fault
1533 L3_ptep ptp,pte,t0,va,itlb_fault
1535 update_ptep ptp,pte,t0,t1
1537 make_insert_tlb spc,pte,prot
1549 space_check spc,t0,itlb_fault
1551 L2_ptep ptp,pte,t0,va,itlb_fault
1553 update_ptep ptp,pte,t0,t1
1555 make_insert_tlb_11 spc,pte,prot
1557 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1560 iitlba pte,(%sr1,va)
1561 iitlbp prot,(%sr1,va)
1563 mtsp t0, %sr1 /* Restore sr1 */
1571 space_check spc,t0,itlb_fault
1573 L2_ptep ptp,pte,t0,va,itlb_fault
1575 update_ptep ptp,pte,t0,t1
1577 make_insert_tlb spc,pte,prot
1591 space_adjust spc,va,t0
1593 space_check spc,t0,dbit_fault
1595 L3_ptep ptp,pte,t0,va,dbit_fault
1598 CMPIB=,n 0,spc,dbit_nolock_20w
1599 load32 PA(pa_dbit_lock),t0
1603 cmpib,= 0,t1,dbit_spin_20w
1608 update_dirty ptp,pte,t1
1610 make_insert_tlb spc,pte,prot
1614 CMPIB=,n 0,spc,dbit_nounlock_20w
1629 space_check spc,t0,dbit_fault
1631 L2_ptep ptp,pte,t0,va,dbit_fault
1634 CMPIB=,n 0,spc,dbit_nolock_11
1635 load32 PA(pa_dbit_lock),t0
1639 cmpib,= 0,t1,dbit_spin_11
1644 update_dirty ptp,pte,t1
1646 make_insert_tlb_11 spc,pte,prot
1648 mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */
1651 idtlba pte,(%sr1,va)
1652 idtlbp prot,(%sr1,va)
1654 mtsp t1, %sr1 /* Restore sr1 */
1656 CMPIB=,n 0,spc,dbit_nounlock_11
1669 space_check spc,t0,dbit_fault
1671 L2_ptep ptp,pte,t0,va,dbit_fault
1674 CMPIB=,n 0,spc,dbit_nolock_20
1675 load32 PA(pa_dbit_lock),t0
1679 cmpib,= 0,t1,dbit_spin_20
1684 update_dirty ptp,pte,t1
1686 make_insert_tlb spc,pte,prot
1693 CMPIB=,n 0,spc,dbit_nounlock_20
1704 .import handle_interruption,code
1708 ldi 31,%r8 /* Use an unused code */
1726 /* Register saving semantics for system calls:
1728 %r1 clobbered by system call macro in userspace
1729 %r2 saved in PT_REGS by gateway page
1730 %r3 - %r18 preserved by C code (saved by signal code)
1731 %r19 - %r20 saved in PT_REGS by gateway page
1732 %r21 - %r22 non-standard syscall args
1733 stored in kernel stack by gateway page
1734 %r23 - %r26 arg3-arg0, saved in PT_REGS by gateway page
1735 %r27 - %r30 saved in PT_REGS by gateway page
1736 %r31 syscall return pointer
1739 /* Floating point registers (FIXME: what do we do with these?)
1741 %fr0 - %fr3 status/exception, not preserved
1742 %fr4 - %fr7 arguments
1743 %fr8 - %fr11 not preserved by C code
1744 %fr12 - %fr21 preserved by C code
1745 %fr22 - %fr31 not preserved by C code
1748 .macro reg_save regs
1749 STREG %r3, PT_GR3(\regs)
1750 STREG %r4, PT_GR4(\regs)
1751 STREG %r5, PT_GR5(\regs)
1752 STREG %r6, PT_GR6(\regs)
1753 STREG %r7, PT_GR7(\regs)
1754 STREG %r8, PT_GR8(\regs)
1755 STREG %r9, PT_GR9(\regs)
1756 STREG %r10,PT_GR10(\regs)
1757 STREG %r11,PT_GR11(\regs)
1758 STREG %r12,PT_GR12(\regs)
1759 STREG %r13,PT_GR13(\regs)
1760 STREG %r14,PT_GR14(\regs)
1761 STREG %r15,PT_GR15(\regs)
1762 STREG %r16,PT_GR16(\regs)
1763 STREG %r17,PT_GR17(\regs)
1764 STREG %r18,PT_GR18(\regs)
1767 .macro reg_restore regs
1768 LDREG PT_GR3(\regs), %r3
1769 LDREG PT_GR4(\regs), %r4
1770 LDREG PT_GR5(\regs), %r5
1771 LDREG PT_GR6(\regs), %r6
1772 LDREG PT_GR7(\regs), %r7
1773 LDREG PT_GR8(\regs), %r8
1774 LDREG PT_GR9(\regs), %r9
1775 LDREG PT_GR10(\regs),%r10
1776 LDREG PT_GR11(\regs),%r11
1777 LDREG PT_GR12(\regs),%r12
1778 LDREG PT_GR13(\regs),%r13
1779 LDREG PT_GR14(\regs),%r14
1780 LDREG PT_GR15(\regs),%r15
1781 LDREG PT_GR16(\regs),%r16
1782 LDREG PT_GR17(\regs),%r17
1783 LDREG PT_GR18(\regs),%r18
1786 .export sys_fork_wrapper
1787 .export child_return
1789 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
1790 ldo TASK_REGS(%r1),%r1
1793 STREG %r3, PT_CR27(%r1)
1795 STREG %r2,-RP_OFFSET(%r30)
1796 ldo FRAME_SIZE(%r30),%r30
1798 ldo -16(%r30),%r29 /* Reference param save area */
1801 /* These are call-clobbered registers and therefore
1802 also syscall-clobbered (we hope). */
1803 STREG %r2,PT_GR19(%r1) /* save for child */
1804 STREG %r30,PT_GR21(%r1)
1806 LDREG PT_GR30(%r1),%r25
1811 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1813 ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */
1814 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1815 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1817 LDREG PT_CR27(%r1), %r3
1821 /* strace expects syscall # to be preserved in r20 */
1824 STREG %r20,PT_GR20(%r1)
1826 /* Set the return value for the child */
1828 BL schedule_tail, %r2
1831 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1
1832 LDREG TASK_PT_GR19(%r1),%r2
1837 .export sys_clone_wrapper
1839 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1840 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1843 STREG %r3, PT_CR27(%r1)
1845 STREG %r2,-RP_OFFSET(%r30)
1846 ldo FRAME_SIZE(%r30),%r30
1848 ldo -16(%r30),%r29 /* Reference param save area */
1851 STREG %r2,PT_GR19(%r1) /* save for child */
1852 STREG %r30,PT_GR21(%r1)
1857 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1859 .export sys_vfork_wrapper
1861 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1862 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1865 STREG %r3, PT_CR27(%r1)
1867 STREG %r2,-RP_OFFSET(%r30)
1868 ldo FRAME_SIZE(%r30),%r30
1870 ldo -16(%r30),%r29 /* Reference param save area */
1873 STREG %r2,PT_GR19(%r1) /* save for child */
1874 STREG %r30,PT_GR21(%r1)
1880 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1883 .macro execve_wrapper execve
1884 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1885 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1888 * Do we need to save/restore r3-r18 here?
1889 * I don't think so. why would new thread need old
1890 * threads registers?
1893 /* %arg0 - %arg3 are already saved for us. */
1895 STREG %r2,-RP_OFFSET(%r30)
1896 ldo FRAME_SIZE(%r30),%r30
1898 ldo -16(%r30),%r29 /* Reference param save area */
1903 ldo -FRAME_SIZE(%r30),%r30
1904 LDREG -RP_OFFSET(%r30),%r2
1906 /* If exec succeeded we need to load the args */
1909 cmpb,>>= %r28,%r1,error_\execve
1917 .export sys_execve_wrapper
1921 execve_wrapper sys_execve
1924 .export sys32_execve_wrapper
1925 .import sys32_execve
1927 sys32_execve_wrapper:
1928 execve_wrapper sys32_execve
1931 .export sys_rt_sigreturn_wrapper
1932 sys_rt_sigreturn_wrapper:
1933 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
1934 ldo TASK_REGS(%r26),%r26 /* get pt regs */
1935 /* Don't save regs, we are going to restore them from sigcontext. */
1936 STREG %r2, -RP_OFFSET(%r30)
1938 ldo FRAME_SIZE(%r30), %r30
1939 BL sys_rt_sigreturn,%r2
1940 ldo -16(%r30),%r29 /* Reference param save area */
1942 BL sys_rt_sigreturn,%r2
1943 ldo FRAME_SIZE(%r30), %r30
1946 ldo -FRAME_SIZE(%r30), %r30
1947 LDREG -RP_OFFSET(%r30), %r2
1949 /* FIXME: I think we need to restore a few more things here. */
1950 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1951 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1954 /* If the signal was received while the process was blocked on a
1955 * syscall, then r2 will take us to syscall_exit; otherwise r2 will
1956 * take us to syscall_exit_rfi and on to intr_return.
1959 LDREG PT_GR28(%r1),%r28 /* reload original r28 for syscall_exit */
1961 .export sys_sigaltstack_wrapper
1962 sys_sigaltstack_wrapper:
1963 /* Get the user stack pointer */
1964 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1965 ldo TASK_REGS(%r1),%r24 /* get pt regs */
1966 LDREG TASK_PT_GR30(%r24),%r24
1967 STREG %r2, -RP_OFFSET(%r30)
1969 ldo FRAME_SIZE(%r30), %r30
1970 b,l do_sigaltstack,%r2
1971 ldo -16(%r30),%r29 /* Reference param save area */
1973 bl do_sigaltstack,%r2
1974 ldo FRAME_SIZE(%r30), %r30
1977 ldo -FRAME_SIZE(%r30), %r30
1978 LDREG -RP_OFFSET(%r30), %r2
1983 .export sys32_sigaltstack_wrapper
1984 sys32_sigaltstack_wrapper:
1985 /* Get the user stack pointer */
1986 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r24
1987 LDREG TASK_PT_GR30(%r24),%r24
1988 STREG %r2, -RP_OFFSET(%r30)
1989 ldo FRAME_SIZE(%r30), %r30
1990 b,l do_sigaltstack32,%r2
1991 ldo -16(%r30),%r29 /* Reference param save area */
1993 ldo -FRAME_SIZE(%r30), %r30
1994 LDREG -RP_OFFSET(%r30), %r2
1999 .export sys_rt_sigsuspend_wrapper
2000 sys_rt_sigsuspend_wrapper:
2001 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
2002 ldo TASK_REGS(%r1),%r24
2005 STREG %r2, -RP_OFFSET(%r30)
2007 ldo FRAME_SIZE(%r30), %r30
2008 b,l sys_rt_sigsuspend,%r2
2009 ldo -16(%r30),%r29 /* Reference param save area */
2011 bl sys_rt_sigsuspend,%r2
2012 ldo FRAME_SIZE(%r30), %r30
2015 ldo -FRAME_SIZE(%r30), %r30
2016 LDREG -RP_OFFSET(%r30), %r2
2018 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
2019 ldo TASK_REGS(%r1),%r1
2025 .export syscall_exit
2028 /* NOTE: HP-UX syscalls also come through here
2029 * after hpux_syscall_exit fixes up return
2032 /* NOTE: Not all syscalls exit this way. rt_sigreturn will exit
2033 * via syscall_exit_rfi if the signal was received while the process
2037 /* save return value now */
2040 LDREG TI_TASK(%r1),%r1
2041 STREG %r28,TASK_PT_GR28(%r1)
2045 /* <linux/personality.h> cannot be easily included */
2046 #define PER_HPUX 0x10
2047 LDREG TASK_PERSONALITY(%r1),%r19
2049 /* We can't use "CMPIB<> PER_HPUX" since "im5" field is sign extended */
2050 ldo -PER_HPUX(%r19), %r19
2053 /* Save other hpux returns if personality is PER_HPUX */
2054 STREG %r22,TASK_PT_GR22(%r1)
2055 STREG %r29,TASK_PT_GR29(%r1)
2058 #endif /* CONFIG_HPUX */
2060 /* Seems to me that dp could be wrong here, if the syscall involved
2061 * calling a module, and nothing got round to restoring dp on return.
2067 /* Check for software interrupts */
2069 .import irq_stat,data
2071 load32 irq_stat,%r19
2074 /* sched.h: int processor */
2075 /* %r26 is used as scratch register to index into irq_stat[] */
2076 ldw TI_CPU-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 /* cpu # */
2078 /* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) bits */
2084 add %r19,%r20,%r19 /* now have &irq_stat[smp_processor_id()] */
2085 #endif /* CONFIG_SMP */
2087 LDREG IRQSTAT_SIRQ_PEND(%r19),%r20 /* hardirq.h: unsigned long */
2088 cmpib,<>,n 0,%r20,syscall_do_softirq /* forward */
2090 syscall_check_resched:
2092 /* check for reschedule */
2094 LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* long */
2095 bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */
2098 LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* get ti flags */
2099 bb,<,n %r19, 31-TIF_SIGPENDING, syscall_do_signal /* forward */
2102 /* Are we being ptraced? */
2103 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2105 LDREG TASK_PTRACE(%r1), %r19
2106 bb,< %r19,31,syscall_restore_rfi
2109 ldo TASK_PT_FR31(%r1),%r19 /* reload fpregs */
2112 LDREG TASK_PT_SAR(%r1),%r19 /* restore SAR */
2115 LDREG TASK_PT_GR2(%r1),%r2 /* restore user rp */
2116 LDREG TASK_PT_GR19(%r1),%r19
2117 LDREG TASK_PT_GR20(%r1),%r20
2118 LDREG TASK_PT_GR21(%r1),%r21
2119 LDREG TASK_PT_GR22(%r1),%r22
2120 LDREG TASK_PT_GR23(%r1),%r23
2121 LDREG TASK_PT_GR24(%r1),%r24
2122 LDREG TASK_PT_GR25(%r1),%r25
2123 LDREG TASK_PT_GR26(%r1),%r26
2124 LDREG TASK_PT_GR27(%r1),%r27 /* restore user dp */
2125 LDREG TASK_PT_GR28(%r1),%r28 /* syscall return value */
2126 LDREG TASK_PT_GR29(%r1),%r29
2127 LDREG TASK_PT_GR31(%r1),%r31 /* restore syscall rp */
2129 /* NOTE: We use rsm/ssm pair to make this operation atomic */
2131 LDREG TASK_PT_GR30(%r1),%r30 /* restore user sp */
2132 mfsp %sr3,%r1 /* Get users space id */
2133 mtsp %r1,%sr7 /* Restore sr7 */
2136 /* Set sr2 to zero for userspace syscalls to work. */
2138 mtsp %r1,%sr4 /* Restore sr4 */
2139 mtsp %r1,%sr5 /* Restore sr5 */
2140 mtsp %r1,%sr6 /* Restore sr6 */
2142 depi 3,31,2,%r31 /* ensure return to user mode. */
2145 /* decide whether to reset the wide mode bit
2147 * For a syscall, the W bit is stored in the lowest bit
2148 * of sp. Extract it and reset W if it is zero */
2149 extrd,u,*<> %r30,63,1,%r1
2151 /* now reset the lowest bit of sp if it was set */
2154 be,n 0(%sr3,%r31) /* return to user space */
2156 /* We have to return via an RFI, so that PSW T and R bits can be set
2158 * This sets up pt_regs so we can return via intr_restore, which is not
2159 * the most efficient way of doing things, but it works.
2161 syscall_restore_rfi:
2162 ldo -1(%r0),%r2 /* Set recovery cntr to -1 */
2163 mtctl %r2,%cr0 /* for immediate trap */
2164 LDREG TASK_PT_PSW(%r1),%r2 /* Get old PSW */
2165 ldi 0x0b,%r20 /* Create new PSW */
2166 depi -1,13,1,%r20 /* C, Q, D, and I bits */
2168 /* The values of PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are
2169 * set in include/linux/ptrace.h and converted to PA bitmap
2170 * numbers in asm-offsets.c */
2172 /* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */
2173 extru,= %r19,PA_SINGLESTEP_BIT,1,%r0
2174 depi -1,27,1,%r20 /* R bit */
2176 /* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */
2177 extru,= %r19,PA_BLOCKSTEP_BIT,1,%r0
2178 depi -1,7,1,%r20 /* T bit */
2180 STREG %r20,TASK_PT_PSW(%r1)
2182 /* Always store space registers, since sr3 can be changed (e.g. fork) */
2185 STREG %r25,TASK_PT_SR3(%r1)
2186 STREG %r25,TASK_PT_SR4(%r1)
2187 STREG %r25,TASK_PT_SR5(%r1)
2188 STREG %r25,TASK_PT_SR6(%r1)
2189 STREG %r25,TASK_PT_SR7(%r1)
2190 STREG %r25,TASK_PT_IASQ0(%r1)
2191 STREG %r25,TASK_PT_IASQ1(%r1)
2194 /* Now if old D bit is clear, it means we didn't save all registers
2195 * on syscall entry, so do that now. This only happens on TRACEME
2196 * calls, or if someone attached to us while we were on a syscall.
2197 * We could make this more efficient by not saving r3-r18, but
2198 * then we wouldn't be able to use the common intr_restore path.
2199 * It is only for traced processes anyway, so performance is not
2202 bb,< %r2,30,pt_regs_ok /* Branch if D set */
2203 ldo TASK_REGS(%r1),%r25
2204 reg_save %r25 /* Save r3 to r18 */
2206 /* Save the current sr */
2208 STREG %r2,TASK_PT_SR0(%r1)
2210 /* Save the scratch sr */
2212 STREG %r2,TASK_PT_SR1(%r1)
2214 /* sr2 should be set to zero for userspace syscalls */
2215 STREG %r0,TASK_PT_SR2(%r1)
2218 LDREG TASK_PT_GR31(%r1),%r2
2219 depi 3,31,2,%r2 /* ensure return to user mode. */
2220 STREG %r2,TASK_PT_IAOQ0(%r1)
2222 STREG %r2,TASK_PT_IAOQ1(%r1)
2227 .import do_softirq,code
2231 /* NOTE: We enable I-bit incase we schedule later,
2232 * and we might be going back to userspace if we were
2234 b syscall_check_resched
2235 ssm PSW_SM_I, %r0 /* do_softirq returns with I bit off */
2237 .import schedule,code
2241 ldo -16(%r30),%r29 /* Reference param save area */
2245 b syscall_check_bh /* if resched, we start over again */
2248 .import do_signal,code
2250 /* Save callee-save registers (for sigcontext).
2251 FIXME: After this point the process structure should be
2252 consistent with all the relevant state of the process
2253 before the syscall. We need to verify this. */
2254 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2255 ldo TASK_REGS(%r1), %r25 /* struct pt_regs *regs */
2258 ldi 1, %r24 /* unsigned long in_syscall */
2261 ldo -16(%r30),%r29 /* Reference param save area */
2264 copy %r0, %r26 /* sigset_t *oldset = NULL */
2266 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2267 ldo TASK_REGS(%r1), %r20 /* reload pt_regs */
2270 b,n syscall_check_sig
2273 * get_register is used by the non access tlb miss handlers to
2274 * copy the value of the general register specified in r8 into
2275 * r1. This routine can't be used for shadowed registers, since
2276 * the rfir will restore the original value. So, for the shadowed
2277 * registers we put a -1 into r1 to indicate that the register
2278 * should not be used (the register being copied could also have
2279 * a -1 in it, but that is OK, it just means that we will have
2280 * to use the slow path instead).
2286 bv %r0(%r25) /* r0 */
2288 bv %r0(%r25) /* r1 - shadowed */
2290 bv %r0(%r25) /* r2 */
2292 bv %r0(%r25) /* r3 */
2294 bv %r0(%r25) /* r4 */
2296 bv %r0(%r25) /* r5 */
2298 bv %r0(%r25) /* r6 */
2300 bv %r0(%r25) /* r7 */
2302 bv %r0(%r25) /* r8 - shadowed */
2304 bv %r0(%r25) /* r9 - shadowed */
2306 bv %r0(%r25) /* r10 */
2308 bv %r0(%r25) /* r11 */
2310 bv %r0(%r25) /* r12 */
2312 bv %r0(%r25) /* r13 */
2314 bv %r0(%r25) /* r14 */
2316 bv %r0(%r25) /* r15 */
2318 bv %r0(%r25) /* r16 - shadowed */
2320 bv %r0(%r25) /* r17 - shadowed */
2322 bv %r0(%r25) /* r18 */
2324 bv %r0(%r25) /* r19 */
2326 bv %r0(%r25) /* r20 */
2328 bv %r0(%r25) /* r21 */
2330 bv %r0(%r25) /* r22 */
2332 bv %r0(%r25) /* r23 */
2334 bv %r0(%r25) /* r24 - shadowed */
2336 bv %r0(%r25) /* r25 - shadowed */
2338 bv %r0(%r25) /* r26 */
2340 bv %r0(%r25) /* r27 */
2342 bv %r0(%r25) /* r28 */
2344 bv %r0(%r25) /* r29 */
2346 bv %r0(%r25) /* r30 */
2348 bv %r0(%r25) /* r31 */
2352 * set_register is used by the non access tlb miss handlers to
2353 * copy the value of r1 into the general register specified in
2360 bv %r0(%r25) /* r0 (silly, but it is a place holder) */
2362 bv %r0(%r25) /* r1 */
2364 bv %r0(%r25) /* r2 */
2366 bv %r0(%r25) /* r3 */
2368 bv %r0(%r25) /* r4 */
2370 bv %r0(%r25) /* r5 */
2372 bv %r0(%r25) /* r6 */
2374 bv %r0(%r25) /* r7 */
2376 bv %r0(%r25) /* r8 */
2378 bv %r0(%r25) /* r9 */
2380 bv %r0(%r25) /* r10 */
2382 bv %r0(%r25) /* r11 */
2384 bv %r0(%r25) /* r12 */
2386 bv %r0(%r25) /* r13 */
2388 bv %r0(%r25) /* r14 */
2390 bv %r0(%r25) /* r15 */
2392 bv %r0(%r25) /* r16 */
2394 bv %r0(%r25) /* r17 */
2396 bv %r0(%r25) /* r18 */
2398 bv %r0(%r25) /* r19 */
2400 bv %r0(%r25) /* r20 */
2402 bv %r0(%r25) /* r21 */
2404 bv %r0(%r25) /* r22 */
2406 bv %r0(%r25) /* r23 */
2408 bv %r0(%r25) /* r24 */
2410 bv %r0(%r25) /* r25 */
2412 bv %r0(%r25) /* r26 */
2414 bv %r0(%r25) /* r27 */
2416 bv %r0(%r25) /* r28 */
2418 bv %r0(%r25) /* r29 */
2420 bv %r0(%r25) /* r30 */
2422 bv %r0(%r25) /* r31 */