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 #if PT_NLEVELS == 3 /* we might have a 2-Level scheme, e.g. with 16kb page size */
506 extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
508 extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0
509 ldw,s \index(\pgd),\pgd
510 extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0
511 bb,>=,n \pgd,_PxD_PRESENT_BIT,\fault
512 extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0
513 shld \pgd,PxD_VALUE_SHIFT,\index
514 extrd,u,*= \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0
516 extrd,u,*<> \va,63-ASM_PGDIR_SHIFT,64-ASM_PGDIR_SHIFT,%r0
517 ldo ASM_PGD_PMD_OFFSET(\pgd),\pgd
519 L2_ptep \pgd,\pte,\index,\va,\fault
522 /* Set the _PAGE_ACCESSED bit of the PTE. Be clever and
523 * don't needlessly dirty the cache line if it was already set */
524 .macro update_ptep ptep,pte,tmp,tmp1
525 ldi _PAGE_ACCESSED,\tmp1
527 and,COND(<>) \tmp1,\pte,%r0
531 /* Set the dirty bit (and accessed bit). No need to be
532 * clever, this is only used from the dirty fault */
533 .macro update_dirty ptep,pte,tmp
534 ldi _PAGE_ACCESSED|_PAGE_DIRTY,\tmp
539 /* Convert the pte and prot to tlb insertion values. How
540 * this happens is quite subtle, read below */
541 .macro make_insert_tlb spc,pte,prot
542 space_to_prot \spc \prot /* create prot id from space */
543 /* The following is the real subtlety. This is depositing
544 * T <-> _PAGE_REFTRAP
546 * B <-> _PAGE_DMB (memory break)
548 * Then incredible subtlety: The access rights are
549 * _PAGE_GATEWAY _PAGE_EXEC _PAGE_READ
550 * See 3-14 of the parisc 2.0 manual
552 * Finally, _PAGE_READ goes in the top bit of PL1 (so we
553 * trigger an access rights trap in user space if the user
554 * tries to read an unreadable page */
557 /* PAGE_USER indicates the page can be read with user privileges,
558 * so deposit X1|11 to PL1|PL2 (remember the upper bit of PL1
559 * contains _PAGE_READ */
560 extrd,u,*= \pte,_PAGE_USER_BIT+32,1,%r0
562 /* If we're a gateway page, drop PL2 back to zero for promotion
563 * to kernel privilege (so we can execute the page as kernel).
564 * Any privilege promotion page always denys read and write */
565 extrd,u,*= \pte,_PAGE_GATEWAY_BIT+32,1,%r0
566 depd %r0,11,2,\prot /* If Gateway, Set PL2 to 0 */
568 /* Enforce uncacheable pages.
569 * This should ONLY be use for MMIO on PA 2.0 machines.
570 * Memory/DMA is cache coherent on all PA2.0 machines we support
571 * (that means T-class is NOT supported) and the memory controllers
572 * on most of those machines only handles cache transactions.
574 extrd,u,*= \pte,_PAGE_NO_CACHE_BIT+32,1,%r0
577 /* Drop prot bits and convert to page addr for iitlbt and idtlbt */
578 extrd,u \pte,(63-ASM_PFN_PTE_SHIFT)+(63-58),64-PAGE_SHIFT,\pte
579 depdi _PAGE_SIZE_ENCODING_DEFAULT,63,63-58,\pte
582 /* Identical macro to make_insert_tlb above, except it
583 * makes the tlb entry for the differently formatted pa11
584 * insertion instructions */
585 .macro make_insert_tlb_11 spc,pte,prot
586 zdep \spc,30,15,\prot
588 extru,= \pte,_PAGE_NO_CACHE_BIT,1,%r0
590 extru,= \pte,_PAGE_USER_BIT,1,%r0
591 depi 7,11,3,\prot /* Set for user space (1 rsvd for read) */
592 extru,= \pte,_PAGE_GATEWAY_BIT,1,%r0
593 depi 0,11,2,\prot /* If Gateway, Set PL2 to 0 */
595 /* Get rid of prot bits and convert to page addr for iitlba */
597 depi _PAGE_SIZE_ENCODING_DEFAULT,31,ASM_PFN_PTE_SHIFT,\pte
598 extru \pte,24,25,\pte
601 /* This is for ILP32 PA2.0 only. The TLB insertion needs
602 * to extend into I/O space if the address is 0xfXXXXXXX
603 * so we extend the f's into the top word of the pte in
605 .macro f_extend pte,tmp
606 extrd,s \pte,42,4,\tmp
608 extrd,s \pte,63,25,\pte
611 /* The alias region is an 8MB aligned 16MB to do clear and
612 * copy user pages at addresses congruent with the user
615 * To use the alias page, you set %r26 up with the to TLB
616 * entry (identifying the physical page) and %r23 up with
617 * the from tlb entry (or nothing if only a to entry---for
618 * clear_user_page_asm) */
619 .macro do_alias spc,tmp,tmp1,va,pte,prot,fault
620 cmpib,COND(<>),n 0,\spc,\fault
621 ldil L%(TMPALIAS_MAP_START),\tmp
622 #if defined(CONFIG_64BIT) && (TMPALIAS_MAP_START >= 0x80000000)
623 /* on LP64, ldi will sign extend into the upper 32 bits,
624 * which is behaviour we don't want */
629 cmpb,COND(<>),n \tmp,\tmp1,\fault
630 ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),\prot
631 depd,z \prot,8,7,\prot
633 * OK, it is in the temp alias region, check whether "from" or "to".
634 * Check "subtle" note in pacache.S re: r23/r26.
637 extrd,u,*= \va,41,1,%r0
639 extrw,u,= \va,9,1,%r0
641 or,COND(tr) %r23,%r0,\pte
647 * Align fault_vector_20 on 4K boundary so that both
648 * fault_vector_11 and fault_vector_20 are on the
649 * same page. This is only necessary as long as we
650 * write protect the kernel text, which we may stop
651 * doing once we use large page translations to cover
652 * the static part of the kernel address space.
655 .export fault_vector_20
662 /* First vector is invalid (0) */
663 .ascii "cows can fly"
705 .export fault_vector_11
710 /* First vector is invalid (0) */
711 .ascii "cows can fly"
753 .import handle_interruption,code
754 .import do_cpu_irq_mask,code
757 * r26 = function to be called
758 * r25 = argument to pass in
759 * r24 = flags for do_fork()
761 * Kernel threads don't ever return, so they don't need
762 * a true register context. We just save away the arguments
763 * for copy_thread/ret_ to properly set up the child.
766 #define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */
767 #define CLONE_UNTRACED 0x00800000
769 .export __kernel_thread, code
772 STREG %r2, -RP_OFFSET(%r30)
775 ldo PT_SZ_ALGN(%r30),%r30
777 /* Yo, function pointers in wide mode are little structs... -PB */
779 STREG %r2, PT_GR27(%r1) /* Store childs %dp */
782 STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */
783 copy %r0, %r22 /* user_tid */
785 STREG %r26, PT_GR26(%r1) /* Store function & argument for child */
786 STREG %r25, PT_GR25(%r1)
787 ldil L%CLONE_UNTRACED, %r26
788 ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */
789 or %r26, %r24, %r26 /* will have kernel mappings. */
790 ldi 1, %r25 /* stack_start, signals kernel thread */
791 stw %r0, -52(%r30) /* user_tid */
793 ldo -16(%r30),%r29 /* Reference param save area */
796 copy %r1, %r24 /* pt_regs */
798 /* Parent Returns here */
800 LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2
801 ldo -PT_SZ_ALGN(%r30), %r30
808 * copy_thread moved args from temp save area set up above
809 * into task save area.
812 .export ret_from_kernel_thread
813 ret_from_kernel_thread:
815 /* Call schedule_tail first though */
816 BL schedule_tail, %r2
819 LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1
820 LDREG TASK_PT_GR25(%r1), %r26
822 LDREG TASK_PT_GR27(%r1), %r27
823 LDREG TASK_PT_GR22(%r1), %r22
825 LDREG TASK_PT_GR26(%r1), %r1
830 ldo -16(%r30),%r29 /* Reference param save area */
831 loadgp /* Thread could have been in a module */
841 .import sys_execve, code
842 .export __execve, code
846 ldo PT_SZ_ALGN(%r30), %r30
847 STREG %r26, PT_GR26(%r16)
848 STREG %r25, PT_GR25(%r16)
849 STREG %r24, PT_GR24(%r16)
851 ldo -16(%r30),%r29 /* Reference param save area */
856 cmpib,=,n 0,%r28,intr_return /* forward */
858 /* yes, this will trap and die. */
867 * struct task_struct *_switch_to(struct task_struct *prev,
868 * struct task_struct *next)
870 * switch kernel stacks and return prev */
871 .export _switch_to, code
873 STREG %r2, -RP_OFFSET(%r30)
878 load32 _switch_to_ret, %r2
880 STREG %r2, TASK_PT_KPC(%r26)
881 LDREG TASK_PT_KPC(%r25), %r2
883 STREG %r30, TASK_PT_KSP(%r26)
884 LDREG TASK_PT_KSP(%r25), %r30
885 LDREG TASK_THREAD_INFO(%r25), %r25
890 mtctl %r0, %cr0 /* Needed for single stepping */
894 LDREG -RP_OFFSET(%r30), %r2
899 * Common rfi return path for interruptions, kernel execve, and
900 * sys_rt_sigreturn (sometimes). The sys_rt_sigreturn syscall will
901 * return via this path if the signal was received when the process
902 * was running; if the process was blocked on a syscall then the
903 * normal syscall_exit path is used. All syscalls for traced
904 * proceses exit via intr_restore.
906 * XXX If any syscalls that change a processes space id ever exit
907 * this way, then we will need to copy %sr3 in to PT_SR[3..7], and
914 .export syscall_exit_rfi
917 LDREG TI_TASK(%r16), %r16 /* thread_info -> task_struct */
918 ldo TASK_REGS(%r16),%r16
919 /* Force iaoq to userspace, as the user has had access to our current
920 * context via sigcontext. Also Filter the PSW for the same reason.
922 LDREG PT_IAOQ0(%r16),%r19
924 STREG %r19,PT_IAOQ0(%r16)
925 LDREG PT_IAOQ1(%r16),%r19
927 STREG %r19,PT_IAOQ1(%r16)
928 LDREG PT_PSW(%r16),%r19
929 load32 USER_PSW_MASK,%r1
931 load32 USER_PSW_HI_MASK,%r20
934 and %r19,%r1,%r19 /* Mask out bits that user shouldn't play with */
936 or %r19,%r1,%r19 /* Make sure default USER_PSW bits are set */
937 STREG %r19,PT_PSW(%r16)
940 * If we aren't being traced, we never saved space registers
941 * (we don't store them in the sigcontext), so set them
942 * to "proper" values now (otherwise we'll wind up restoring
943 * whatever was last stored in the task structure, which might
944 * be inconsistent if an interrupt occured while on the gateway
945 * page) Note that we may be "trashing" values the user put in
946 * them, but we don't support the the user changing them.
949 STREG %r0,PT_SR2(%r16)
951 STREG %r19,PT_SR0(%r16)
952 STREG %r19,PT_SR1(%r16)
953 STREG %r19,PT_SR3(%r16)
954 STREG %r19,PT_SR4(%r16)
955 STREG %r19,PT_SR5(%r16)
956 STREG %r19,PT_SR6(%r16)
957 STREG %r19,PT_SR7(%r16)
960 /* NOTE: Need to enable interrupts incase we schedule. */
963 /* Check for software interrupts */
965 .import irq_stat,data
970 ldw TI_CPU(%r1),%r1 /* get cpu # - int */
971 /* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) amount
972 ** irq_stat[] is defined using ____cacheline_aligned.
979 add %r19,%r20,%r19 /* now have &irq_stat[smp_processor_id()] */
980 #endif /* CONFIG_SMP */
984 /* check for reschedule */
986 LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */
987 bb,<,n %r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */
992 LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_SIGPENDING */
993 bb,<,n %r19, 31-TIF_SIGPENDING, intr_do_signal /* forward */
997 ldo PT_FR31(%r29),%r1
1001 /* inverse of virt_map */
1003 rsm PSW_SM_QUIET,%r0 /* prepare for rfi */
1006 /* Restore space id's and special cr's from PT_REGS
1007 * structure pointed to by r29
1011 /* IMPORTANT: rest_stack restores r29 last (we are using it)!
1012 * It also restores r1 and r30.
1026 #ifndef CONFIG_PREEMPT
1027 # define intr_do_preempt intr_restore
1028 #endif /* !CONFIG_PREEMPT */
1030 .import schedule,code
1032 /* Only call schedule on return to userspace. If we're returning
1033 * to kernel space, we may schedule if CONFIG_PREEMPT, otherwise
1034 * we jump back to intr_restore.
1036 LDREG PT_IASQ0(%r16), %r20
1037 CMPIB= 0, %r20, intr_do_preempt
1039 LDREG PT_IASQ1(%r16), %r20
1040 CMPIB= 0, %r20, intr_do_preempt
1044 ldo -16(%r30),%r29 /* Reference param save area */
1047 ldil L%intr_check_sig, %r2
1048 #ifndef CONFIG_64BIT
1051 load32 schedule, %r20
1054 ldo R%intr_check_sig(%r2), %r2
1056 /* preempt the current task on returning to kernel
1057 * mode from an interrupt, iff need_resched is set,
1058 * and preempt_count is 0. otherwise, we continue on
1059 * our merry way back to the current running task.
1061 #ifdef CONFIG_PREEMPT
1062 .import preempt_schedule_irq,code
1064 rsm PSW_SM_I, %r0 /* disable interrupts */
1066 /* current_thread_info()->preempt_count */
1068 LDREG TI_PRE_COUNT(%r1), %r19
1069 CMPIB<> 0, %r19, intr_restore /* if preempt_count > 0 */
1070 nop /* prev insn branched backwards */
1072 /* check if we interrupted a critical path */
1073 LDREG PT_PSW(%r16), %r20
1074 bb,<,n %r20, 31 - PSW_SM_I, intr_restore
1077 BL preempt_schedule_irq, %r2
1080 b intr_restore /* ssm PSW_SM_I done by intr_restore */
1081 #endif /* CONFIG_PREEMPT */
1083 .import do_signal,code
1086 This check is critical to having LWS
1087 working. The IASQ is zero on the gateway
1088 page and we cannot deliver any signals until
1089 we get off the gateway page.
1091 Only do signals if we are returning to user space
1093 LDREG PT_IASQ0(%r16), %r20
1094 CMPIB= 0,%r20,intr_restore /* backward */
1096 LDREG PT_IASQ1(%r16), %r20
1097 CMPIB= 0,%r20,intr_restore /* backward */
1100 copy %r0, %r24 /* unsigned long in_syscall */
1101 copy %r16, %r25 /* struct pt_regs *regs */
1103 ldo -16(%r30),%r29 /* Reference param save area */
1107 copy %r0, %r26 /* sigset_t *oldset = NULL */
1113 * External interrupts.
1122 #if 0 /* Interrupt Stack support not working yet! */
1125 /* FIXME! depi below has hardcoded idea of interrupt stack size (32k)*/
1143 ldo PT_FR0(%r29), %r24
1148 copy %r29, %r26 /* arg0 is pt_regs */
1149 copy %r29, %r16 /* save pt_regs */
1151 ldil L%intr_return, %r2
1154 ldo -16(%r30),%r29 /* Reference param save area */
1158 ldo R%intr_return(%r2), %r2 /* return to intr_return, not here */
1161 /* Generic interruptions (illegal insn, unaligned, page fault, etc) */
1163 .export intr_save, code /* for os_hpmc */
1179 /* If this trap is a itlb miss, skip saving/adjusting isr/ior */
1182 * FIXME: 1) Use a #define for the hardwired "6" below (and in
1184 * 2) Once we start executing code above 4 Gb, we need
1185 * to adjust iasq/iaoq here in the same way we
1186 * adjust isr/ior below.
1189 CMPIB=,n 6,%r26,skip_save_ior
1192 mfctl %cr20, %r16 /* isr */
1193 nop /* serialize mfctl on PA 2.0 to avoid 4 cycle penalty */
1194 mfctl %cr21, %r17 /* ior */
1199 * If the interrupted code was running with W bit off (32 bit),
1200 * clear the b bits (bits 0 & 1) in the ior.
1201 * save_specials left ipsw value in r8 for us to test.
1203 extrd,u,*<> %r8,PSW_W_BIT,1,%r0
1207 * FIXME: This code has hardwired assumptions about the split
1208 * between space bits and offset bits. This will change
1209 * when we allow alternate page sizes.
1212 /* adjust isr/ior. */
1213 extrd,u %r16,63,SPACEID_SHIFT,%r1 /* get high bits from isr for ior */
1214 depd %r1,31,SPACEID_SHIFT,%r17 /* deposit them into ior */
1215 depdi 0,63,SPACEID_SHIFT,%r16 /* clear them from isr */
1217 STREG %r16, PT_ISR(%r29)
1218 STREG %r17, PT_IOR(%r29)
1225 ldo PT_FR0(%r29), %r25
1230 copy %r29, %r25 /* arg1 is pt_regs */
1232 ldo -16(%r30),%r29 /* Reference param save area */
1235 ldil L%intr_check_sig, %r2
1236 copy %r25, %r16 /* save pt_regs */
1238 b handle_interruption
1239 ldo R%intr_check_sig(%r2), %r2
1243 * Note for all tlb miss handlers:
1245 * cr24 contains a pointer to the kernel address space
1248 * cr25 contains a pointer to the current user address
1249 * space page directory.
1251 * sr3 will contain the space id of the user address space
1252 * of the current running thread while that thread is
1253 * running in the kernel.
1257 * register number allocations. Note that these are all
1258 * in the shadowed registers
1261 t0 = r1 /* temporary register 0 */
1262 va = r8 /* virtual address for which the trap occured */
1263 t1 = r9 /* temporary register 1 */
1264 pte = r16 /* pte/phys page # */
1265 prot = r17 /* prot bits */
1266 spc = r24 /* space for which the trap occured */
1267 ptp = r25 /* page directory/page table pointer */
1272 space_adjust spc,va,t0
1274 space_check spc,t0,dtlb_fault
1276 L3_ptep ptp,pte,t0,va,dtlb_check_alias_20w
1278 update_ptep ptp,pte,t0,t1
1280 make_insert_tlb spc,pte,prot
1287 dtlb_check_alias_20w:
1288 do_alias spc,t0,t1,va,pte,prot,dtlb_fault
1296 space_adjust spc,va,t0
1298 space_check spc,t0,nadtlb_fault
1300 L3_ptep ptp,pte,t0,va,nadtlb_check_flush_20w
1302 update_ptep ptp,pte,t0,t1
1304 make_insert_tlb spc,pte,prot
1311 nadtlb_check_flush_20w:
1312 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1314 /* Insert a "flush only" translation */
1319 /* Get rid of prot bits and convert to page addr for idtlbt */
1322 extrd,u pte,56,52,pte
1333 space_check spc,t0,dtlb_fault
1335 L2_ptep ptp,pte,t0,va,dtlb_check_alias_11
1337 update_ptep ptp,pte,t0,t1
1339 make_insert_tlb_11 spc,pte,prot
1341 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1344 idtlba pte,(%sr1,va)
1345 idtlbp prot,(%sr1,va)
1347 mtsp t0, %sr1 /* Restore sr1 */
1352 dtlb_check_alias_11:
1354 /* Check to see if fault is in the temporary alias region */
1356 cmpib,<>,n 0,spc,dtlb_fault /* forward */
1357 ldil L%(TMPALIAS_MAP_START),t0
1360 cmpb,<>,n t0,t1,dtlb_fault /* forward */
1361 ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),prot
1362 depw,z prot,8,7,prot
1365 * OK, it is in the temp alias region, check whether "from" or "to".
1366 * Check "subtle" note in pacache.S re: r23/r26.
1370 or,tr %r23,%r0,pte /* If "from" use "from" page */
1371 or %r26,%r0,pte /* else "to", use "to" page */
1382 space_check spc,t0,nadtlb_fault
1384 L2_ptep ptp,pte,t0,va,nadtlb_check_flush_11
1386 update_ptep ptp,pte,t0,t1
1388 make_insert_tlb_11 spc,pte,prot
1391 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1394 idtlba pte,(%sr1,va)
1395 idtlbp prot,(%sr1,va)
1397 mtsp t0, %sr1 /* Restore sr1 */
1402 nadtlb_check_flush_11:
1403 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1405 /* Insert a "flush only" translation */
1410 /* Get rid of prot bits and convert to page addr for idtlba */
1415 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1418 idtlba pte,(%sr1,va)
1419 idtlbp prot,(%sr1,va)
1421 mtsp t0, %sr1 /* Restore sr1 */
1427 space_adjust spc,va,t0
1429 space_check spc,t0,dtlb_fault
1431 L2_ptep ptp,pte,t0,va,dtlb_check_alias_20
1433 update_ptep ptp,pte,t0,t1
1435 make_insert_tlb spc,pte,prot
1444 dtlb_check_alias_20:
1445 do_alias spc,t0,t1,va,pte,prot,dtlb_fault
1455 space_check spc,t0,nadtlb_fault
1457 L2_ptep ptp,pte,t0,va,nadtlb_check_flush_20
1459 update_ptep ptp,pte,t0,t1
1461 make_insert_tlb spc,pte,prot
1470 nadtlb_check_flush_20:
1471 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1473 /* Insert a "flush only" translation */
1478 /* Get rid of prot bits and convert to page addr for idtlbt */
1481 extrd,u pte,56,32,pte
1491 * Non access misses can be caused by fdc,fic,pdc,lpa,probe and
1492 * probei instructions. We don't want to fault for these
1493 * instructions (not only does it not make sense, it can cause
1494 * deadlocks, since some flushes are done with the mmap
1495 * semaphore held). If the translation doesn't exist, we can't
1496 * insert a translation, so have to emulate the side effects
1497 * of the instruction. Since we don't insert a translation
1498 * we can get a lot of faults during a flush loop, so it makes
1499 * sense to try to do it here with minimum overhead. We only
1500 * emulate fdc,fic,pdc,probew,prober instructions whose base
1501 * and index registers are not shadowed. We defer everything
1502 * else to the "slow" path.
1505 mfctl %cr19,%r9 /* Get iir */
1507 /* PA 2.0 Arch Ref. Book pg 382 has a good description of the insn bits.
1508 Checks for fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw */
1510 /* Checks for fdc,fdce,pdc,"fic,4f" only */
1513 cmpb,<>,n %r16,%r17,nadtlb_probe_check
1514 bb,>=,n %r9,26,nadtlb_nullify /* m bit not set, just nullify */
1515 BL get_register,%r25
1516 extrw,u %r9,15,5,%r8 /* Get index register # */
1517 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1519 BL get_register,%r25
1520 extrw,u %r9,10,5,%r8 /* Get base register # */
1521 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1522 BL set_register,%r25
1523 add,l %r1,%r24,%r1 /* doesn't affect c/b bits */
1528 or %r8,%r9,%r8 /* Set PSW_N */
1535 When there is no translation for the probe address then we
1536 must nullify the insn and return zero in the target regsiter.
1537 This will indicate to the calling code that it does not have
1538 write/read privileges to this address.
1540 This should technically work for prober and probew in PA 1.1,
1541 and also probe,r and probe,w in PA 2.0
1543 WARNING: USE ONLY NON-SHADOW REGISTERS WITH PROBE INSN!
1544 THE SLOW-PATH EMULATION HAS NOT BEEN WRITTEN YET.
1550 cmpb,<>,n %r16,%r17,nadtlb_fault /* Must be probe,[rw]*/
1551 BL get_register,%r25 /* Find the target register */
1552 extrw,u %r9,31,5,%r8 /* Get target register */
1553 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1554 BL set_register,%r25
1555 copy %r0,%r1 /* Write zero to target register */
1556 b nadtlb_nullify /* Nullify return insn */
1564 * I miss is a little different, since we allow users to fault
1565 * on the gateway page which is in the kernel address space.
1568 space_adjust spc,va,t0
1570 space_check spc,t0,itlb_fault
1572 L3_ptep ptp,pte,t0,va,itlb_fault
1574 update_ptep ptp,pte,t0,t1
1576 make_insert_tlb spc,pte,prot
1588 space_check spc,t0,itlb_fault
1590 L2_ptep ptp,pte,t0,va,itlb_fault
1592 update_ptep ptp,pte,t0,t1
1594 make_insert_tlb_11 spc,pte,prot
1596 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1599 iitlba pte,(%sr1,va)
1600 iitlbp prot,(%sr1,va)
1602 mtsp t0, %sr1 /* Restore sr1 */
1610 space_check spc,t0,itlb_fault
1612 L2_ptep ptp,pte,t0,va,itlb_fault
1614 update_ptep ptp,pte,t0,t1
1616 make_insert_tlb spc,pte,prot
1630 space_adjust spc,va,t0
1632 space_check spc,t0,dbit_fault
1634 L3_ptep ptp,pte,t0,va,dbit_fault
1637 CMPIB=,n 0,spc,dbit_nolock_20w
1638 load32 PA(pa_dbit_lock),t0
1642 cmpib,= 0,t1,dbit_spin_20w
1647 update_dirty ptp,pte,t1
1649 make_insert_tlb spc,pte,prot
1653 CMPIB=,n 0,spc,dbit_nounlock_20w
1668 space_check spc,t0,dbit_fault
1670 L2_ptep ptp,pte,t0,va,dbit_fault
1673 CMPIB=,n 0,spc,dbit_nolock_11
1674 load32 PA(pa_dbit_lock),t0
1678 cmpib,= 0,t1,dbit_spin_11
1683 update_dirty ptp,pte,t1
1685 make_insert_tlb_11 spc,pte,prot
1687 mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */
1690 idtlba pte,(%sr1,va)
1691 idtlbp prot,(%sr1,va)
1693 mtsp t1, %sr1 /* Restore sr1 */
1695 CMPIB=,n 0,spc,dbit_nounlock_11
1708 space_check spc,t0,dbit_fault
1710 L2_ptep ptp,pte,t0,va,dbit_fault
1713 CMPIB=,n 0,spc,dbit_nolock_20
1714 load32 PA(pa_dbit_lock),t0
1718 cmpib,= 0,t1,dbit_spin_20
1723 update_dirty ptp,pte,t1
1725 make_insert_tlb spc,pte,prot
1732 CMPIB=,n 0,spc,dbit_nounlock_20
1743 .import handle_interruption,code
1747 ldi 31,%r8 /* Use an unused code */
1765 /* Register saving semantics for system calls:
1767 %r1 clobbered by system call macro in userspace
1768 %r2 saved in PT_REGS by gateway page
1769 %r3 - %r18 preserved by C code (saved by signal code)
1770 %r19 - %r20 saved in PT_REGS by gateway page
1771 %r21 - %r22 non-standard syscall args
1772 stored in kernel stack by gateway page
1773 %r23 - %r26 arg3-arg0, saved in PT_REGS by gateway page
1774 %r27 - %r30 saved in PT_REGS by gateway page
1775 %r31 syscall return pointer
1778 /* Floating point registers (FIXME: what do we do with these?)
1780 %fr0 - %fr3 status/exception, not preserved
1781 %fr4 - %fr7 arguments
1782 %fr8 - %fr11 not preserved by C code
1783 %fr12 - %fr21 preserved by C code
1784 %fr22 - %fr31 not preserved by C code
1787 .macro reg_save regs
1788 STREG %r3, PT_GR3(\regs)
1789 STREG %r4, PT_GR4(\regs)
1790 STREG %r5, PT_GR5(\regs)
1791 STREG %r6, PT_GR6(\regs)
1792 STREG %r7, PT_GR7(\regs)
1793 STREG %r8, PT_GR8(\regs)
1794 STREG %r9, PT_GR9(\regs)
1795 STREG %r10,PT_GR10(\regs)
1796 STREG %r11,PT_GR11(\regs)
1797 STREG %r12,PT_GR12(\regs)
1798 STREG %r13,PT_GR13(\regs)
1799 STREG %r14,PT_GR14(\regs)
1800 STREG %r15,PT_GR15(\regs)
1801 STREG %r16,PT_GR16(\regs)
1802 STREG %r17,PT_GR17(\regs)
1803 STREG %r18,PT_GR18(\regs)
1806 .macro reg_restore regs
1807 LDREG PT_GR3(\regs), %r3
1808 LDREG PT_GR4(\regs), %r4
1809 LDREG PT_GR5(\regs), %r5
1810 LDREG PT_GR6(\regs), %r6
1811 LDREG PT_GR7(\regs), %r7
1812 LDREG PT_GR8(\regs), %r8
1813 LDREG PT_GR9(\regs), %r9
1814 LDREG PT_GR10(\regs),%r10
1815 LDREG PT_GR11(\regs),%r11
1816 LDREG PT_GR12(\regs),%r12
1817 LDREG PT_GR13(\regs),%r13
1818 LDREG PT_GR14(\regs),%r14
1819 LDREG PT_GR15(\regs),%r15
1820 LDREG PT_GR16(\regs),%r16
1821 LDREG PT_GR17(\regs),%r17
1822 LDREG PT_GR18(\regs),%r18
1825 .export sys_fork_wrapper
1826 .export child_return
1828 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
1829 ldo TASK_REGS(%r1),%r1
1832 STREG %r3, PT_CR27(%r1)
1834 STREG %r2,-RP_OFFSET(%r30)
1835 ldo FRAME_SIZE(%r30),%r30
1837 ldo -16(%r30),%r29 /* Reference param save area */
1840 /* These are call-clobbered registers and therefore
1841 also syscall-clobbered (we hope). */
1842 STREG %r2,PT_GR19(%r1) /* save for child */
1843 STREG %r30,PT_GR21(%r1)
1845 LDREG PT_GR30(%r1),%r25
1850 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1852 ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */
1853 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1854 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1856 LDREG PT_CR27(%r1), %r3
1860 /* strace expects syscall # to be preserved in r20 */
1863 STREG %r20,PT_GR20(%r1)
1865 /* Set the return value for the child */
1867 BL schedule_tail, %r2
1870 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1
1871 LDREG TASK_PT_GR19(%r1),%r2
1876 .export sys_clone_wrapper
1878 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1879 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1882 STREG %r3, PT_CR27(%r1)
1884 STREG %r2,-RP_OFFSET(%r30)
1885 ldo FRAME_SIZE(%r30),%r30
1887 ldo -16(%r30),%r29 /* Reference param save area */
1890 /* WARNING - Clobbers r19 and r21, userspace must save these! */
1891 STREG %r2,PT_GR19(%r1) /* save for child */
1892 STREG %r30,PT_GR21(%r1)
1897 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1899 .export sys_vfork_wrapper
1901 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1902 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1905 STREG %r3, PT_CR27(%r1)
1907 STREG %r2,-RP_OFFSET(%r30)
1908 ldo FRAME_SIZE(%r30),%r30
1910 ldo -16(%r30),%r29 /* Reference param save area */
1913 STREG %r2,PT_GR19(%r1) /* save for child */
1914 STREG %r30,PT_GR21(%r1)
1920 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1923 .macro execve_wrapper execve
1924 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1925 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1928 * Do we need to save/restore r3-r18 here?
1929 * I don't think so. why would new thread need old
1930 * threads registers?
1933 /* %arg0 - %arg3 are already saved for us. */
1935 STREG %r2,-RP_OFFSET(%r30)
1936 ldo FRAME_SIZE(%r30),%r30
1938 ldo -16(%r30),%r29 /* Reference param save area */
1943 ldo -FRAME_SIZE(%r30),%r30
1944 LDREG -RP_OFFSET(%r30),%r2
1946 /* If exec succeeded we need to load the args */
1949 cmpb,>>= %r28,%r1,error_\execve
1957 .export sys_execve_wrapper
1961 execve_wrapper sys_execve
1964 .export sys32_execve_wrapper
1965 .import sys32_execve
1967 sys32_execve_wrapper:
1968 execve_wrapper sys32_execve
1971 .export sys_rt_sigreturn_wrapper
1972 sys_rt_sigreturn_wrapper:
1973 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
1974 ldo TASK_REGS(%r26),%r26 /* get pt regs */
1975 /* Don't save regs, we are going to restore them from sigcontext. */
1976 STREG %r2, -RP_OFFSET(%r30)
1978 ldo FRAME_SIZE(%r30), %r30
1979 BL sys_rt_sigreturn,%r2
1980 ldo -16(%r30),%r29 /* Reference param save area */
1982 BL sys_rt_sigreturn,%r2
1983 ldo FRAME_SIZE(%r30), %r30
1986 ldo -FRAME_SIZE(%r30), %r30
1987 LDREG -RP_OFFSET(%r30), %r2
1989 /* FIXME: I think we need to restore a few more things here. */
1990 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1991 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1994 /* If the signal was received while the process was blocked on a
1995 * syscall, then r2 will take us to syscall_exit; otherwise r2 will
1996 * take us to syscall_exit_rfi and on to intr_return.
1999 LDREG PT_GR28(%r1),%r28 /* reload original r28 for syscall_exit */
2001 .export sys_sigaltstack_wrapper
2002 sys_sigaltstack_wrapper:
2003 /* Get the user stack pointer */
2004 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2005 ldo TASK_REGS(%r1),%r24 /* get pt regs */
2006 LDREG TASK_PT_GR30(%r24),%r24
2007 STREG %r2, -RP_OFFSET(%r30)
2009 ldo FRAME_SIZE(%r30), %r30
2010 b,l do_sigaltstack,%r2
2011 ldo -16(%r30),%r29 /* Reference param save area */
2013 bl do_sigaltstack,%r2
2014 ldo FRAME_SIZE(%r30), %r30
2017 ldo -FRAME_SIZE(%r30), %r30
2018 LDREG -RP_OFFSET(%r30), %r2
2023 .export sys32_sigaltstack_wrapper
2024 sys32_sigaltstack_wrapper:
2025 /* Get the user stack pointer */
2026 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r24
2027 LDREG TASK_PT_GR30(%r24),%r24
2028 STREG %r2, -RP_OFFSET(%r30)
2029 ldo FRAME_SIZE(%r30), %r30
2030 b,l do_sigaltstack32,%r2
2031 ldo -16(%r30),%r29 /* Reference param save area */
2033 ldo -FRAME_SIZE(%r30), %r30
2034 LDREG -RP_OFFSET(%r30), %r2
2039 .export sys_rt_sigsuspend_wrapper
2040 sys_rt_sigsuspend_wrapper:
2041 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
2042 ldo TASK_REGS(%r1),%r24
2045 STREG %r2, -RP_OFFSET(%r30)
2047 ldo FRAME_SIZE(%r30), %r30
2048 b,l sys_rt_sigsuspend,%r2
2049 ldo -16(%r30),%r29 /* Reference param save area */
2051 bl sys_rt_sigsuspend,%r2
2052 ldo FRAME_SIZE(%r30), %r30
2055 ldo -FRAME_SIZE(%r30), %r30
2056 LDREG -RP_OFFSET(%r30), %r2
2058 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
2059 ldo TASK_REGS(%r1),%r1
2065 .export syscall_exit
2068 /* NOTE: HP-UX syscalls also come through here
2069 * after hpux_syscall_exit fixes up return
2072 /* NOTE: Not all syscalls exit this way. rt_sigreturn will exit
2073 * via syscall_exit_rfi if the signal was received while the process
2077 /* save return value now */
2080 LDREG TI_TASK(%r1),%r1
2081 STREG %r28,TASK_PT_GR28(%r1)
2085 /* <linux/personality.h> cannot be easily included */
2086 #define PER_HPUX 0x10
2087 LDREG TASK_PERSONALITY(%r1),%r19
2089 /* We can't use "CMPIB<> PER_HPUX" since "im5" field is sign extended */
2090 ldo -PER_HPUX(%r19), %r19
2093 /* Save other hpux returns if personality is PER_HPUX */
2094 STREG %r22,TASK_PT_GR22(%r1)
2095 STREG %r29,TASK_PT_GR29(%r1)
2098 #endif /* CONFIG_HPUX */
2100 /* Seems to me that dp could be wrong here, if the syscall involved
2101 * calling a module, and nothing got round to restoring dp on return.
2107 /* Check for software interrupts */
2109 .import irq_stat,data
2111 load32 irq_stat,%r19
2114 /* sched.h: int processor */
2115 /* %r26 is used as scratch register to index into irq_stat[] */
2116 ldw TI_CPU-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 /* cpu # */
2118 /* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) bits */
2124 add %r19,%r20,%r19 /* now have &irq_stat[smp_processor_id()] */
2125 #endif /* CONFIG_SMP */
2127 syscall_check_resched:
2129 /* check for reschedule */
2131 LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* long */
2132 bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */
2135 LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* get ti flags */
2136 bb,<,n %r19, 31-TIF_SIGPENDING, syscall_do_signal /* forward */
2139 /* Are we being ptraced? */
2140 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2142 LDREG TASK_PTRACE(%r1), %r19
2143 bb,< %r19,31,syscall_restore_rfi
2146 ldo TASK_PT_FR31(%r1),%r19 /* reload fpregs */
2149 LDREG TASK_PT_SAR(%r1),%r19 /* restore SAR */
2152 LDREG TASK_PT_GR2(%r1),%r2 /* restore user rp */
2153 LDREG TASK_PT_GR19(%r1),%r19
2154 LDREG TASK_PT_GR20(%r1),%r20
2155 LDREG TASK_PT_GR21(%r1),%r21
2156 LDREG TASK_PT_GR22(%r1),%r22
2157 LDREG TASK_PT_GR23(%r1),%r23
2158 LDREG TASK_PT_GR24(%r1),%r24
2159 LDREG TASK_PT_GR25(%r1),%r25
2160 LDREG TASK_PT_GR26(%r1),%r26
2161 LDREG TASK_PT_GR27(%r1),%r27 /* restore user dp */
2162 LDREG TASK_PT_GR28(%r1),%r28 /* syscall return value */
2163 LDREG TASK_PT_GR29(%r1),%r29
2164 LDREG TASK_PT_GR31(%r1),%r31 /* restore syscall rp */
2166 /* NOTE: We use rsm/ssm pair to make this operation atomic */
2168 LDREG TASK_PT_GR30(%r1),%r30 /* restore user sp */
2169 mfsp %sr3,%r1 /* Get users space id */
2170 mtsp %r1,%sr7 /* Restore sr7 */
2173 /* Set sr2 to zero for userspace syscalls to work. */
2175 mtsp %r1,%sr4 /* Restore sr4 */
2176 mtsp %r1,%sr5 /* Restore sr5 */
2177 mtsp %r1,%sr6 /* Restore sr6 */
2179 depi 3,31,2,%r31 /* ensure return to user mode. */
2182 /* decide whether to reset the wide mode bit
2184 * For a syscall, the W bit is stored in the lowest bit
2185 * of sp. Extract it and reset W if it is zero */
2186 extrd,u,*<> %r30,63,1,%r1
2188 /* now reset the lowest bit of sp if it was set */
2191 be,n 0(%sr3,%r31) /* return to user space */
2193 /* We have to return via an RFI, so that PSW T and R bits can be set
2195 * This sets up pt_regs so we can return via intr_restore, which is not
2196 * the most efficient way of doing things, but it works.
2198 syscall_restore_rfi:
2199 ldo -1(%r0),%r2 /* Set recovery cntr to -1 */
2200 mtctl %r2,%cr0 /* for immediate trap */
2201 LDREG TASK_PT_PSW(%r1),%r2 /* Get old PSW */
2202 ldi 0x0b,%r20 /* Create new PSW */
2203 depi -1,13,1,%r20 /* C, Q, D, and I bits */
2205 /* The values of PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are
2206 * set in include/linux/ptrace.h and converted to PA bitmap
2207 * numbers in asm-offsets.c */
2209 /* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */
2210 extru,= %r19,PA_SINGLESTEP_BIT,1,%r0
2211 depi -1,27,1,%r20 /* R bit */
2213 /* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */
2214 extru,= %r19,PA_BLOCKSTEP_BIT,1,%r0
2215 depi -1,7,1,%r20 /* T bit */
2217 STREG %r20,TASK_PT_PSW(%r1)
2219 /* Always store space registers, since sr3 can be changed (e.g. fork) */
2222 STREG %r25,TASK_PT_SR3(%r1)
2223 STREG %r25,TASK_PT_SR4(%r1)
2224 STREG %r25,TASK_PT_SR5(%r1)
2225 STREG %r25,TASK_PT_SR6(%r1)
2226 STREG %r25,TASK_PT_SR7(%r1)
2227 STREG %r25,TASK_PT_IASQ0(%r1)
2228 STREG %r25,TASK_PT_IASQ1(%r1)
2231 /* Now if old D bit is clear, it means we didn't save all registers
2232 * on syscall entry, so do that now. This only happens on TRACEME
2233 * calls, or if someone attached to us while we were on a syscall.
2234 * We could make this more efficient by not saving r3-r18, but
2235 * then we wouldn't be able to use the common intr_restore path.
2236 * It is only for traced processes anyway, so performance is not
2239 bb,< %r2,30,pt_regs_ok /* Branch if D set */
2240 ldo TASK_REGS(%r1),%r25
2241 reg_save %r25 /* Save r3 to r18 */
2243 /* Save the current sr */
2245 STREG %r2,TASK_PT_SR0(%r1)
2247 /* Save the scratch sr */
2249 STREG %r2,TASK_PT_SR1(%r1)
2251 /* sr2 should be set to zero for userspace syscalls */
2252 STREG %r0,TASK_PT_SR2(%r1)
2255 LDREG TASK_PT_GR31(%r1),%r2
2256 depi 3,31,2,%r2 /* ensure return to user mode. */
2257 STREG %r2,TASK_PT_IAOQ0(%r1)
2259 STREG %r2,TASK_PT_IAOQ1(%r1)
2264 .import schedule,code
2268 ldo -16(%r30),%r29 /* Reference param save area */
2272 b syscall_check_bh /* if resched, we start over again */
2275 .import do_signal,code
2277 /* Save callee-save registers (for sigcontext).
2278 FIXME: After this point the process structure should be
2279 consistent with all the relevant state of the process
2280 before the syscall. We need to verify this. */
2281 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2282 ldo TASK_REGS(%r1), %r25 /* struct pt_regs *regs */
2285 ldi 1, %r24 /* unsigned long in_syscall */
2288 ldo -16(%r30),%r29 /* Reference param save area */
2291 copy %r0, %r26 /* sigset_t *oldset = NULL */
2293 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2294 ldo TASK_REGS(%r1), %r20 /* reload pt_regs */
2297 b,n syscall_check_sig
2300 * get_register is used by the non access tlb miss handlers to
2301 * copy the value of the general register specified in r8 into
2302 * r1. This routine can't be used for shadowed registers, since
2303 * the rfir will restore the original value. So, for the shadowed
2304 * registers we put a -1 into r1 to indicate that the register
2305 * should not be used (the register being copied could also have
2306 * a -1 in it, but that is OK, it just means that we will have
2307 * to use the slow path instead).
2313 bv %r0(%r25) /* r0 */
2315 bv %r0(%r25) /* r1 - shadowed */
2317 bv %r0(%r25) /* r2 */
2319 bv %r0(%r25) /* r3 */
2321 bv %r0(%r25) /* r4 */
2323 bv %r0(%r25) /* r5 */
2325 bv %r0(%r25) /* r6 */
2327 bv %r0(%r25) /* r7 */
2329 bv %r0(%r25) /* r8 - shadowed */
2331 bv %r0(%r25) /* r9 - shadowed */
2333 bv %r0(%r25) /* r10 */
2335 bv %r0(%r25) /* r11 */
2337 bv %r0(%r25) /* r12 */
2339 bv %r0(%r25) /* r13 */
2341 bv %r0(%r25) /* r14 */
2343 bv %r0(%r25) /* r15 */
2345 bv %r0(%r25) /* r16 - shadowed */
2347 bv %r0(%r25) /* r17 - shadowed */
2349 bv %r0(%r25) /* r18 */
2351 bv %r0(%r25) /* r19 */
2353 bv %r0(%r25) /* r20 */
2355 bv %r0(%r25) /* r21 */
2357 bv %r0(%r25) /* r22 */
2359 bv %r0(%r25) /* r23 */
2361 bv %r0(%r25) /* r24 - shadowed */
2363 bv %r0(%r25) /* r25 - shadowed */
2365 bv %r0(%r25) /* r26 */
2367 bv %r0(%r25) /* r27 */
2369 bv %r0(%r25) /* r28 */
2371 bv %r0(%r25) /* r29 */
2373 bv %r0(%r25) /* r30 */
2375 bv %r0(%r25) /* r31 */
2379 * set_register is used by the non access tlb miss handlers to
2380 * copy the value of r1 into the general register specified in
2387 bv %r0(%r25) /* r0 (silly, but it is a place holder) */
2389 bv %r0(%r25) /* r1 */
2391 bv %r0(%r25) /* r2 */
2393 bv %r0(%r25) /* r3 */
2395 bv %r0(%r25) /* r4 */
2397 bv %r0(%r25) /* r5 */
2399 bv %r0(%r25) /* r6 */
2401 bv %r0(%r25) /* r7 */
2403 bv %r0(%r25) /* r8 */
2405 bv %r0(%r25) /* r9 */
2407 bv %r0(%r25) /* r10 */
2409 bv %r0(%r25) /* r11 */
2411 bv %r0(%r25) /* r12 */
2413 bv %r0(%r25) /* r13 */
2415 bv %r0(%r25) /* r14 */
2417 bv %r0(%r25) /* r15 */
2419 bv %r0(%r25) /* r16 */
2421 bv %r0(%r25) /* r17 */
2423 bv %r0(%r25) /* r18 */
2425 bv %r0(%r25) /* r19 */
2427 bv %r0(%r25) /* r20 */
2429 bv %r0(%r25) /* r21 */
2431 bv %r0(%r25) /* r22 */
2433 bv %r0(%r25) /* r23 */
2435 bv %r0(%r25) /* r24 */
2437 bv %r0(%r25) /* r25 */
2439 bv %r0(%r25) /* r26 */
2441 bv %r0(%r25) /* r27 */
2443 bv %r0(%r25) /* r28 */
2445 bv %r0(%r25) /* r29 */
2447 bv %r0(%r25) /* r30 */
2449 bv %r0(%r25) /* r31 */