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 */
33 #include <asm/assembly.h> /* for LDREG/STREG defines */
34 #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 */
73 or,= %r0,%r1,%r0 /* Only save sr7 in sr3 if sr7 != 0 */
79 load32 KERNEL_PSW, %r1
81 mtctl %r0, %cr17 /* Clear IIASQ tail */
82 mtctl %r0, %cr17 /* Clear IIASQ head */
84 mtctl %r1, %cr18 /* Set IIAOQ tail */
86 mtctl %r1, %cr18 /* Set IIAOQ head */
93 * The "get_stack" macros are responsible for determining the
98 * Already using a kernel stack, so call the
99 * get_stack_use_r30 macro to push a pt_regs structure
100 * on the stack, and store registers there.
102 * Need to set up a kernel stack, so call the
103 * get_stack_use_cr30 macro to set up a pointer
104 * to the pt_regs structure contained within the
105 * task pointer pointed to by cr30. Set the stack
106 * pointer to point to the end of the task structure.
110 * Already using a kernel stack, check to see if r30
111 * is already pointing to the per processor interrupt
112 * stack. If it is, call the get_stack_use_r30 macro
113 * to push a pt_regs structure on the stack, and store
114 * registers there. Otherwise, call get_stack_use_cr31
115 * to get a pointer to the base of the interrupt stack
116 * and push a pt_regs structure on that stack.
118 * Need to set up a kernel stack, so call the
119 * get_stack_use_cr30 macro to set up a pointer
120 * to the pt_regs structure contained within the
121 * task pointer pointed to by cr30. Set the stack
122 * pointer to point to the end of the task structure.
123 * N.B: We don't use the interrupt stack for the
124 * first interrupt from userland, because signals/
125 * resched's are processed when returning to userland,
126 * and we can sleep in those cases.
128 * Note that we use shadowed registers for temps until
129 * we can save %r26 and %r29. %r26 is used to preserve
130 * %r8 (a shadowed register) which temporarily contained
131 * either the fault type ("code") or the eirr. We need
132 * to use a non-shadowed register to carry the value over
133 * the rfir in virt_map. We use %r26 since this value winds
134 * up being passed as the argument to either do_cpu_irq_mask
135 * or handle_interruption. %r29 is used to hold a pointer
136 * the register save area, and once again, it needs to
137 * be a non-shadowed register so that it survives the rfir.
139 * N.B. TASK_SZ_ALGN and PT_SZ_ALGN include space for a stack frame.
142 .macro get_stack_use_cr30
144 /* we save the registers in the task struct */
148 LDREG TI_TASK(%r9), %r1 /* thread_info -> task_struct */
150 ldo TASK_REGS(%r9),%r9
151 STREG %r30, PT_GR30(%r9)
152 STREG %r29,PT_GR29(%r9)
153 STREG %r26,PT_GR26(%r9)
156 ldo THREAD_SZ_ALGN(%r1), %r30
159 .macro get_stack_use_r30
161 /* we put a struct pt_regs on the stack and save the registers there */
164 STREG %r30,PT_GR30(%r9)
165 ldo PT_SZ_ALGN(%r30),%r30
166 STREG %r29,PT_GR29(%r9)
167 STREG %r26,PT_GR26(%r9)
172 LDREG PT_GR1(%r29), %r1
173 LDREG PT_GR30(%r29),%r30
174 LDREG PT_GR29(%r29),%r29
177 /* default interruption handler
178 * (calls traps.c:handle_interruption) */
185 /* Interrupt interruption handler
186 * (calls irq.c:do_cpu_irq_mask) */
193 .import os_hpmc, code
197 nop /* must be a NOP, will be patched later */
198 load32 PA(os_hpmc), %r3
201 .word 0 /* checksum (will be patched) */
202 .word PA(os_hpmc) /* address of handler */
203 .word 0 /* length of handler */
207 * Performance Note: Instructions will be moved up into
208 * this part of the code later on, once we are sure
209 * that the tlb miss handlers are close to final form.
212 /* Register definitions for tlb miss handler macros */
214 va = r8 /* virtual address for which the trap occured */
215 spc = r24 /* space for which the trap occured */
220 * itlb miss interruption handler (parisc 1.1 - 32 bit)
234 * itlb miss interruption handler (parisc 2.0)
251 * naitlb miss interruption handler (parisc 1.1 - 32 bit)
253 * Note: naitlb misses will be treated
254 * as an ordinary itlb miss for now.
255 * However, note that naitlb misses
256 * have the faulting address in the
260 .macro naitlb_11 code
265 /* FIXME: If user causes a naitlb miss, the priv level may not be in
266 * lower bits of va, where the itlb miss handler is expecting them
274 * naitlb miss interruption handler (parisc 2.0)
276 * Note: naitlb misses will be treated
277 * as an ordinary itlb miss for now.
278 * However, note that naitlb misses
279 * have the faulting address in the
283 .macro naitlb_20 code
292 /* FIXME: If user causes a naitlb miss, the priv level may not be in
293 * lower bits of va, where the itlb miss handler is expecting them
301 * dtlb miss interruption handler (parisc 1.1 - 32 bit)
315 * dtlb miss interruption handler (parisc 2.0)
332 /* nadtlb miss interruption handler (parisc 1.1 - 32 bit) */
334 .macro nadtlb_11 code
344 /* nadtlb miss interruption handler (parisc 2.0) */
346 .macro nadtlb_20 code
361 * dirty bit trap interruption handler (parisc 1.1 - 32 bit)
375 * dirty bit trap interruption handler (parisc 2.0)
391 /* The following are simple 32 vs 64 bit instruction
392 * abstractions for the macros */
393 .macro EXTR reg1,start,length,reg2
395 extrd,u \reg1,32+\start,\length,\reg2
397 extrw,u \reg1,\start,\length,\reg2
401 .macro DEP reg1,start,length,reg2
403 depd \reg1,32+\start,\length,\reg2
405 depw \reg1,\start,\length,\reg2
409 .macro DEPI val,start,length,reg
411 depdi \val,32+\start,\length,\reg
413 depwi \val,\start,\length,\reg
417 /* In LP64, the space contains part of the upper 32 bits of the
418 * fault. We have to extract this and place it in the va,
419 * zeroing the corresponding bits in the space register */
420 .macro space_adjust spc,va,tmp
422 extrd,u \spc,63,SPACEID_SHIFT,\tmp
423 depd %r0,63,SPACEID_SHIFT,\spc
424 depd \tmp,31,SPACEID_SHIFT,\va
428 .import swapper_pg_dir,code
430 /* Get the pgd. For faults on space zero (kernel space), this
431 * is simply swapper_pg_dir. For user space faults, the
432 * pgd is stored in %cr25 */
433 .macro get_pgd spc,reg
434 ldil L%PA(swapper_pg_dir),\reg
435 ldo R%PA(swapper_pg_dir)(\reg),\reg
436 or,COND(=) %r0,\spc,%r0
441 space_check(spc,tmp,fault)
443 spc - The space we saw the fault with.
444 tmp - The place to store the current space.
445 fault - Function to call on failure.
447 Only allow faults on different spaces from the
448 currently active one if we're the kernel
451 .macro space_check spc,tmp,fault
453 or,COND(<>) %r0,\spc,%r0 /* user may execute gateway page
454 * as kernel, so defeat the space
457 or,COND(=) %r0,\tmp,%r0 /* nullify if executing as kernel */
458 cmpb,COND(<>),n \tmp,\spc,\fault
461 /* Look up a PTE in a 2-Level scheme (faulting at each
462 * level if the entry isn't present
464 * NOTE: we use ldw even for LP64, since the short pointers
465 * can address up to 1TB
467 .macro L2_ptep pmd,pte,index,va,fault
469 EXTR \va,31-ASM_PMD_SHIFT,ASM_BITS_PER_PMD,\index
471 EXTR \va,31-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
473 DEP %r0,31,PAGE_SHIFT,\pmd /* clear offset */
475 ldw,s \index(\pmd),\pmd
476 bb,>=,n \pmd,_PxD_PRESENT_BIT,\fault
477 DEP %r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */
480 shld %r9,PxD_VALUE_SHIFT,\pmd
482 shlw %r9,PxD_VALUE_SHIFT,\pmd
484 EXTR \va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index
485 DEP %r0,31,PAGE_SHIFT,\pmd /* clear offset */
486 shladd \index,BITS_PER_PTE_ENTRY,\pmd,\pmd
487 LDREG %r0(\pmd),\pte /* pmd is now pte */
488 bb,>=,n \pte,_PAGE_PRESENT_BIT,\fault
491 /* Look up PTE in a 3-Level scheme.
493 * Here we implement a Hybrid L2/L3 scheme: we allocate the
494 * first pmd adjacent to the pgd. This means that we can
495 * subtract a constant offset to get to it. The pmd and pgd
496 * sizes are arranged so that a single pmd covers 4GB (giving
497 * a full LP64 process access to 8TB) so our lookups are
498 * effectively L2 for the first 4GB of the kernel (i.e. for
499 * all ILP32 processes and all the kernel for machines with
500 * under 4GB of memory) */
501 .macro L3_ptep pgd,pte,index,va,fault
502 extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index
504 extrd,u,*= \va,31,32,%r0
505 ldw,s \index(\pgd),\pgd
506 extrd,u,*= \va,31,32,%r0
507 bb,>=,n \pgd,_PxD_PRESENT_BIT,\fault
508 extrd,u,*= \va,31,32,%r0
509 shld \pgd,PxD_VALUE_SHIFT,\index
510 extrd,u,*= \va,31,32,%r0
512 extrd,u,*<> \va,31,32,%r0
513 ldo ASM_PGD_PMD_OFFSET(\pgd),\pgd
514 L2_ptep \pgd,\pte,\index,\va,\fault
517 /* Set the _PAGE_ACCESSED bit of the PTE. Be clever and
518 * don't needlessly dirty the cache line if it was already set */
519 .macro update_ptep ptep,pte,tmp,tmp1
520 ldi _PAGE_ACCESSED,\tmp1
522 and,COND(<>) \tmp1,\pte,%r0
526 /* Set the dirty bit (and accessed bit). No need to be
527 * clever, this is only used from the dirty fault */
528 .macro update_dirty ptep,pte,tmp
529 ldi _PAGE_ACCESSED|_PAGE_DIRTY,\tmp
534 /* Convert the pte and prot to tlb insertion values. How
535 * this happens is quite subtle, read below */
536 .macro make_insert_tlb spc,pte,prot
537 space_to_prot \spc \prot /* create prot id from space */
538 /* The following is the real subtlety. This is depositing
539 * T <-> _PAGE_REFTRAP
541 * B <-> _PAGE_DMB (memory break)
543 * Then incredible subtlety: The access rights are
544 * _PAGE_GATEWAY _PAGE_EXEC _PAGE_READ
545 * See 3-14 of the parisc 2.0 manual
547 * Finally, _PAGE_READ goes in the top bit of PL1 (so we
548 * trigger an access rights trap in user space if the user
549 * tries to read an unreadable page */
552 /* PAGE_USER indicates the page can be read with user privileges,
553 * so deposit X1|11 to PL1|PL2 (remember the upper bit of PL1
554 * contains _PAGE_READ */
555 extrd,u,*= \pte,_PAGE_USER_BIT+32,1,%r0
557 /* If we're a gateway page, drop PL2 back to zero for promotion
558 * to kernel privilege (so we can execute the page as kernel).
559 * Any privilege promotion page always denys read and write */
560 extrd,u,*= \pte,_PAGE_GATEWAY_BIT+32,1,%r0
561 depd %r0,11,2,\prot /* If Gateway, Set PL2 to 0 */
563 /* Get rid of prot bits and convert to page addr for iitlbt */
565 depd %r0,63,PAGE_SHIFT,\pte
566 extrd,u \pte,56,32,\pte
569 /* Identical macro to make_insert_tlb above, except it
570 * makes the tlb entry for the differently formatted pa11
571 * insertion instructions */
572 .macro make_insert_tlb_11 spc,pte,prot
573 zdep \spc,30,15,\prot
575 extru,= \pte,_PAGE_NO_CACHE_BIT,1,%r0
577 extru,= \pte,_PAGE_USER_BIT,1,%r0
578 depi 7,11,3,\prot /* Set for user space (1 rsvd for read) */
579 extru,= \pte,_PAGE_GATEWAY_BIT,1,%r0
580 depi 0,11,2,\prot /* If Gateway, Set PL2 to 0 */
582 /* Get rid of prot bits and convert to page addr for iitlba */
585 extru \pte,24,25,\pte
589 /* This is for ILP32 PA2.0 only. The TLB insertion needs
590 * to extend into I/O space if the address is 0xfXXXXXXX
591 * so we extend the f's into the top word of the pte in
593 .macro f_extend pte,tmp
594 extrd,s \pte,42,4,\tmp
596 extrd,s \pte,63,25,\pte
599 /* The alias region is an 8MB aligned 16MB to do clear and
600 * copy user pages at addresses congruent with the user
603 * To use the alias page, you set %r26 up with the to TLB
604 * entry (identifying the physical page) and %r23 up with
605 * the from tlb entry (or nothing if only a to entry---for
606 * clear_user_page_asm) */
607 .macro do_alias spc,tmp,tmp1,va,pte,prot,fault
608 cmpib,COND(<>),n 0,\spc,\fault
609 ldil L%(TMPALIAS_MAP_START),\tmp
610 #if defined(__LP64__) && (TMPALIAS_MAP_START >= 0x80000000)
611 /* on LP64, ldi will sign extend into the upper 32 bits,
612 * which is behaviour we don't want */
617 cmpb,COND(<>),n \tmp,\tmp1,\fault
618 ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),\prot
619 depd,z \prot,8,7,\prot
621 * OK, it is in the temp alias region, check whether "from" or "to".
622 * Check "subtle" note in pacache.S re: r23/r26.
625 extrd,u,*= \va,41,1,%r0
627 extrw,u,= \va,9,1,%r0
629 or,COND(tr) %r23,%r0,\pte
635 * Align fault_vector_20 on 4K boundary so that both
636 * fault_vector_11 and fault_vector_20 are on the
637 * same page. This is only necessary as long as we
638 * write protect the kernel text, which we may stop
639 * doing once we use large page translations to cover
640 * the static part of the kernel address space.
643 .export fault_vector_20
650 /* First vector is invalid (0) */
651 .ascii "cows can fly"
693 .export fault_vector_11
698 /* First vector is invalid (0) */
699 .ascii "cows can fly"
741 .import handle_interruption,code
742 .import do_cpu_irq_mask,code
745 * r26 = function to be called
746 * r25 = argument to pass in
747 * r24 = flags for do_fork()
749 * Kernel threads don't ever return, so they don't need
750 * a true register context. We just save away the arguments
751 * for copy_thread/ret_ to properly set up the child.
754 #define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */
755 #define CLONE_UNTRACED 0x00800000
757 .export __kernel_thread, code
760 STREG %r2, -RP_OFFSET(%r30)
763 ldo PT_SZ_ALGN(%r30),%r30
765 /* Yo, function pointers in wide mode are little structs... -PB */
767 STREG %r2, PT_GR27(%r1) /* Store childs %dp */
770 STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */
771 copy %r0, %r22 /* user_tid */
773 STREG %r26, PT_GR26(%r1) /* Store function & argument for child */
774 STREG %r25, PT_GR25(%r1)
775 ldil L%CLONE_UNTRACED, %r26
776 ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */
777 or %r26, %r24, %r26 /* will have kernel mappings. */
778 ldi 1, %r25 /* stack_start, signals kernel thread */
779 stw %r0, -52(%r30) /* user_tid */
781 ldo -16(%r30),%r29 /* Reference param save area */
784 copy %r1, %r24 /* pt_regs */
786 /* Parent Returns here */
788 LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2
789 ldo -PT_SZ_ALGN(%r30), %r30
796 * copy_thread moved args from temp save area set up above
797 * into task save area.
800 .export ret_from_kernel_thread
801 ret_from_kernel_thread:
803 /* Call schedule_tail first though */
804 BL schedule_tail, %r2
807 LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1
808 LDREG TASK_PT_GR25(%r1), %r26
810 LDREG TASK_PT_GR27(%r1), %r27
811 LDREG TASK_PT_GR22(%r1), %r22
813 LDREG TASK_PT_GR26(%r1), %r1
818 ldo -16(%r30),%r29 /* Reference param save area */
819 loadgp /* Thread could have been in a module */
824 .import sys_execve, code
825 .export __execve, code
829 ldo PT_SZ_ALGN(%r30), %r30
830 STREG %r26, PT_GR26(%r16)
831 STREG %r25, PT_GR25(%r16)
832 STREG %r24, PT_GR24(%r16)
834 ldo -16(%r30),%r29 /* Reference param save area */
839 cmpib,=,n 0,%r28,intr_return /* forward */
841 /* yes, this will trap and die. */
850 * struct task_struct *_switch_to(struct task_struct *prev,
851 * struct task_struct *next)
853 * switch kernel stacks and return prev */
854 .export _switch_to, code
856 STREG %r2, -RP_OFFSET(%r30)
860 load32 _switch_to_ret, %r2
862 STREG %r2, TASK_PT_KPC(%r26)
863 LDREG TASK_PT_KPC(%r25), %r2
865 STREG %r30, TASK_PT_KSP(%r26)
866 LDREG TASK_PT_KSP(%r25), %r30
867 LDREG TASK_THREAD_INFO(%r25), %r25
872 mtctl %r0, %cr0 /* Needed for single stepping */
875 LDREG -RP_OFFSET(%r30), %r2
880 * Common rfi return path for interruptions, kernel execve, and
881 * sys_rt_sigreturn (sometimes). The sys_rt_sigreturn syscall will
882 * return via this path if the signal was received when the process
883 * was running; if the process was blocked on a syscall then the
884 * normal syscall_exit path is used. All syscalls for traced
885 * proceses exit via intr_restore.
887 * XXX If any syscalls that change a processes space id ever exit
888 * this way, then we will need to copy %sr3 in to PT_SR[3..7], and
891 * Note that the following code uses a "relied upon translation".
892 * See the parisc ACD for details. The ssm is necessary due to a
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 /* Create a "relied upon translation" PA 2.0 Arch. F-5 */
998 rsm (PSW_SM_Q|PSW_SM_P|PSW_SM_D|PSW_SM_I),%r0
1000 /* Restore space id's and special cr's from PT_REGS
1001 * structure pointed to by r29 */
1004 /* Important: Note that rest_stack restores r29
1005 * last (we are using it)! It also restores r1 and r30. */
1018 .import do_softirq,code
1022 ldo -16(%r30),%r29 /* Reference param save area */
1026 b intr_check_resched
1029 .import schedule,code
1031 /* Only do reschedule if we are returning to user space */
1032 LDREG PT_IASQ0(%r16), %r20
1033 CMPIB= 0,%r20,intr_restore /* backward */
1035 LDREG PT_IASQ1(%r16), %r20
1036 CMPIB= 0,%r20,intr_restore /* backward */
1040 ldo -16(%r30),%r29 /* Reference param save area */
1043 ldil L%intr_check_sig, %r2
1045 ldo R%intr_check_sig(%r2), %r2
1048 .import do_signal,code
1051 This check is critical to having LWS
1052 working. The IASQ is zero on the gateway
1053 page and we cannot deliver any signals until
1054 we get off the gateway page.
1056 Only do signals if we are returning to user space
1058 LDREG PT_IASQ0(%r16), %r20
1059 CMPIB= 0,%r20,intr_restore /* backward */
1061 LDREG PT_IASQ1(%r16), %r20
1062 CMPIB= 0,%r20,intr_restore /* backward */
1065 copy %r0, %r24 /* unsigned long in_syscall */
1066 copy %r16, %r25 /* struct pt_regs *regs */
1068 ldo -16(%r30),%r29 /* Reference param save area */
1072 copy %r0, %r26 /* sigset_t *oldset = NULL */
1078 * External interrupts.
1087 #if 0 /* Interrupt Stack support not working yet! */
1090 /* FIXME! depi below has hardcoded idea of interrupt stack size (32k)*/
1108 ldo PT_FR0(%r29), %r24
1113 copy %r29, %r26 /* arg0 is pt_regs */
1114 copy %r29, %r16 /* save pt_regs */
1116 ldil L%intr_return, %r2
1119 ldo -16(%r30),%r29 /* Reference param save area */
1123 ldo R%intr_return(%r2), %r2 /* return to intr_return, not here */
1126 /* Generic interruptions (illegal insn, unaligned, page fault, etc) */
1128 .export intr_save, code /* for os_hpmc */
1144 /* If this trap is a itlb miss, skip saving/adjusting isr/ior */
1147 * FIXME: 1) Use a #define for the hardwired "6" below (and in
1149 * 2) Once we start executing code above 4 Gb, we need
1150 * to adjust iasq/iaoq here in the same way we
1151 * adjust isr/ior below.
1154 CMPIB=,n 6,%r26,skip_save_ior
1156 /* save_specials left ipsw value in r8 for us to test */
1158 mfctl %cr20, %r16 /* isr */
1159 mfctl %cr21, %r17 /* ior */
1163 * If the interrupted code was running with W bit off (32 bit),
1164 * clear the b bits (bits 0 & 1) in the ior.
1166 extrd,u,*<> %r8,PSW_W_BIT,1,%r0
1170 * FIXME: This code has hardwired assumptions about the split
1171 * between space bits and offset bits. This will change
1172 * when we allow alternate page sizes.
1175 /* adjust isr/ior. */
1177 extrd,u %r16,63,7,%r1 /* get high bits from isr for ior */
1178 depd %r1,31,7,%r17 /* deposit them into ior */
1179 depdi 0,63,7,%r16 /* clear them from isr */
1181 STREG %r16, PT_ISR(%r29)
1182 STREG %r17, PT_IOR(%r29)
1189 ldo PT_FR0(%r29), %r25
1194 copy %r29, %r25 /* arg1 is pt_regs */
1196 ldo -16(%r30),%r29 /* Reference param save area */
1199 ldil L%intr_check_sig, %r2
1200 copy %r25, %r16 /* save pt_regs */
1202 b handle_interruption
1203 ldo R%intr_check_sig(%r2), %r2
1207 * Note for all tlb miss handlers:
1209 * cr24 contains a pointer to the kernel address space
1212 * cr25 contains a pointer to the current user address
1213 * space page directory.
1215 * sr3 will contain the space id of the user address space
1216 * of the current running thread while that thread is
1217 * running in the kernel.
1221 * register number allocations. Note that these are all
1222 * in the shadowed registers
1225 t0 = r1 /* temporary register 0 */
1226 va = r8 /* virtual address for which the trap occured */
1227 t1 = r9 /* temporary register 1 */
1228 pte = r16 /* pte/phys page # */
1229 prot = r17 /* prot bits */
1230 spc = r24 /* space for which the trap occured */
1231 ptp = r25 /* page directory/page table pointer */
1236 space_adjust spc,va,t0
1238 space_check spc,t0,dtlb_fault
1240 L3_ptep ptp,pte,t0,va,dtlb_check_alias_20w
1242 update_ptep ptp,pte,t0,t1
1244 make_insert_tlb spc,pte,prot
1251 dtlb_check_alias_20w:
1252 do_alias spc,t0,t1,va,pte,prot,dtlb_fault
1260 space_adjust spc,va,t0
1262 space_check spc,t0,nadtlb_fault
1264 L3_ptep ptp,pte,t0,va,nadtlb_check_flush_20w
1266 update_ptep ptp,pte,t0,t1
1268 make_insert_tlb spc,pte,prot
1275 nadtlb_check_flush_20w:
1276 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1278 /* Insert a "flush only" translation */
1283 /* Get rid of prot bits and convert to page addr for idtlbt */
1286 extrd,u pte,56,52,pte
1297 space_check spc,t0,dtlb_fault
1299 L2_ptep ptp,pte,t0,va,dtlb_check_alias_11
1301 update_ptep ptp,pte,t0,t1
1303 make_insert_tlb_11 spc,pte,prot
1305 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1308 idtlba pte,(%sr1,va)
1309 idtlbp prot,(%sr1,va)
1311 mtsp t0, %sr1 /* Restore sr1 */
1316 dtlb_check_alias_11:
1318 /* Check to see if fault is in the temporary alias region */
1320 cmpib,<>,n 0,spc,dtlb_fault /* forward */
1321 ldil L%(TMPALIAS_MAP_START),t0
1324 cmpb,<>,n t0,t1,dtlb_fault /* forward */
1325 ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),prot
1326 depw,z prot,8,7,prot
1329 * OK, it is in the temp alias region, check whether "from" or "to".
1330 * Check "subtle" note in pacache.S re: r23/r26.
1334 or,tr %r23,%r0,pte /* If "from" use "from" page */
1335 or %r26,%r0,pte /* else "to", use "to" page */
1346 space_check spc,t0,nadtlb_fault
1348 L2_ptep ptp,pte,t0,va,nadtlb_check_flush_11
1350 update_ptep ptp,pte,t0,t1
1352 make_insert_tlb_11 spc,pte,prot
1355 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1358 idtlba pte,(%sr1,va)
1359 idtlbp prot,(%sr1,va)
1361 mtsp t0, %sr1 /* Restore sr1 */
1366 nadtlb_check_flush_11:
1367 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1369 /* Insert a "flush only" translation */
1374 /* Get rid of prot bits and convert to page addr for idtlba */
1379 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1382 idtlba pte,(%sr1,va)
1383 idtlbp prot,(%sr1,va)
1385 mtsp t0, %sr1 /* Restore sr1 */
1391 space_adjust spc,va,t0
1393 space_check spc,t0,dtlb_fault
1395 L2_ptep ptp,pte,t0,va,dtlb_check_alias_20
1397 update_ptep ptp,pte,t0,t1
1399 make_insert_tlb spc,pte,prot
1408 dtlb_check_alias_20:
1409 do_alias spc,t0,t1,va,pte,prot,dtlb_fault
1419 space_check spc,t0,nadtlb_fault
1421 L2_ptep ptp,pte,t0,va,nadtlb_check_flush_20
1423 update_ptep ptp,pte,t0,t1
1425 make_insert_tlb spc,pte,prot
1434 nadtlb_check_flush_20:
1435 bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate
1437 /* Insert a "flush only" translation */
1442 /* Get rid of prot bits and convert to page addr for idtlbt */
1445 extrd,u pte,56,32,pte
1455 * Non access misses can be caused by fdc,fic,pdc,lpa,probe and
1456 * probei instructions. We don't want to fault for these
1457 * instructions (not only does it not make sense, it can cause
1458 * deadlocks, since some flushes are done with the mmap
1459 * semaphore held). If the translation doesn't exist, we can't
1460 * insert a translation, so have to emulate the side effects
1461 * of the instruction. Since we don't insert a translation
1462 * we can get a lot of faults during a flush loop, so it makes
1463 * sense to try to do it here with minimum overhead. We only
1464 * emulate fdc,fic,pdc,probew,prober instructions whose base
1465 * and index registers are not shadowed. We defer everything
1466 * else to the "slow" path.
1469 mfctl %cr19,%r9 /* Get iir */
1471 /* PA 2.0 Arch Ref. Book pg 382 has a good description of the insn bits.
1472 Checks for fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw */
1474 /* Checks for fdc,fdce,pdc,"fic,4f" only */
1477 cmpb,<>,n %r16,%r17,nadtlb_probe_check
1478 bb,>=,n %r9,26,nadtlb_nullify /* m bit not set, just nullify */
1479 BL get_register,%r25
1480 extrw,u %r9,15,5,%r8 /* Get index register # */
1481 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1483 BL get_register,%r25
1484 extrw,u %r9,10,5,%r8 /* Get base register # */
1485 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1486 BL set_register,%r25
1487 add,l %r1,%r24,%r1 /* doesn't affect c/b bits */
1490 mfctl %cr22,%r8 /* Get ipsw */
1492 or %r8,%r9,%r8 /* Set PSW_N */
1499 When there is no translation for the probe address then we
1500 must nullify the insn and return zero in the target regsiter.
1501 This will indicate to the calling code that it does not have
1502 write/read privileges to this address.
1504 This should technically work for prober and probew in PA 1.1,
1505 and also probe,r and probe,w in PA 2.0
1507 WARNING: USE ONLY NON-SHADOW REGISTERS WITH PROBE INSN!
1508 THE SLOW-PATH EMULATION HAS NOT BEEN WRITTEN YET.
1514 cmpb,<>,n %r16,%r17,nadtlb_fault /* Must be probe,[rw]*/
1515 BL get_register,%r25 /* Find the target register */
1516 extrw,u %r9,31,5,%r8 /* Get target register */
1517 CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */
1518 BL set_register,%r25
1519 copy %r0,%r1 /* Write zero to target register */
1520 b nadtlb_nullify /* Nullify return insn */
1528 * I miss is a little different, since we allow users to fault
1529 * on the gateway page which is in the kernel address space.
1532 space_adjust spc,va,t0
1534 space_check spc,t0,itlb_fault
1536 L3_ptep ptp,pte,t0,va,itlb_fault
1538 update_ptep ptp,pte,t0,t1
1540 make_insert_tlb spc,pte,prot
1552 space_check spc,t0,itlb_fault
1554 L2_ptep ptp,pte,t0,va,itlb_fault
1556 update_ptep ptp,pte,t0,t1
1558 make_insert_tlb_11 spc,pte,prot
1560 mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */
1563 iitlba pte,(%sr1,va)
1564 iitlbp prot,(%sr1,va)
1566 mtsp t0, %sr1 /* Restore sr1 */
1574 space_check spc,t0,itlb_fault
1576 L2_ptep ptp,pte,t0,va,itlb_fault
1578 update_ptep ptp,pte,t0,t1
1580 make_insert_tlb spc,pte,prot
1594 space_adjust spc,va,t0
1596 space_check spc,t0,dbit_fault
1598 L3_ptep ptp,pte,t0,va,dbit_fault
1601 CMPIB=,n 0,spc,dbit_nolock_20w
1602 load32 PA(pa_dbit_lock),t0
1606 cmpib,= 0,t1,dbit_spin_20w
1611 update_dirty ptp,pte,t1
1613 make_insert_tlb spc,pte,prot
1617 CMPIB=,n 0,spc,dbit_nounlock_20w
1632 space_check spc,t0,dbit_fault
1634 L2_ptep ptp,pte,t0,va,dbit_fault
1637 CMPIB=,n 0,spc,dbit_nolock_11
1638 load32 PA(pa_dbit_lock),t0
1642 cmpib,= 0,t1,dbit_spin_11
1647 update_dirty ptp,pte,t1
1649 make_insert_tlb_11 spc,pte,prot
1651 mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */
1654 idtlba pte,(%sr1,va)
1655 idtlbp prot,(%sr1,va)
1657 mtsp t1, %sr1 /* Restore sr1 */
1659 CMPIB=,n 0,spc,dbit_nounlock_11
1672 space_check spc,t0,dbit_fault
1674 L2_ptep ptp,pte,t0,va,dbit_fault
1677 CMPIB=,n 0,spc,dbit_nolock_20
1678 load32 PA(pa_dbit_lock),t0
1682 cmpib,= 0,t1,dbit_spin_20
1687 update_dirty ptp,pte,t1
1689 make_insert_tlb spc,pte,prot
1696 CMPIB=,n 0,spc,dbit_nounlock_20
1707 .import handle_interruption,code
1711 ldi 31,%r8 /* Use an unused code */
1729 /* Register saving semantics for system calls:
1731 %r1 clobbered by system call macro in userspace
1732 %r2 saved in PT_REGS by gateway page
1733 %r3 - %r18 preserved by C code (saved by signal code)
1734 %r19 - %r20 saved in PT_REGS by gateway page
1735 %r21 - %r22 non-standard syscall args
1736 stored in kernel stack by gateway page
1737 %r23 - %r26 arg3-arg0, saved in PT_REGS by gateway page
1738 %r27 - %r30 saved in PT_REGS by gateway page
1739 %r31 syscall return pointer
1742 /* Floating point registers (FIXME: what do we do with these?)
1744 %fr0 - %fr3 status/exception, not preserved
1745 %fr4 - %fr7 arguments
1746 %fr8 - %fr11 not preserved by C code
1747 %fr12 - %fr21 preserved by C code
1748 %fr22 - %fr31 not preserved by C code
1751 .macro reg_save regs
1752 STREG %r3, PT_GR3(\regs)
1753 STREG %r4, PT_GR4(\regs)
1754 STREG %r5, PT_GR5(\regs)
1755 STREG %r6, PT_GR6(\regs)
1756 STREG %r7, PT_GR7(\regs)
1757 STREG %r8, PT_GR8(\regs)
1758 STREG %r9, PT_GR9(\regs)
1759 STREG %r10,PT_GR10(\regs)
1760 STREG %r11,PT_GR11(\regs)
1761 STREG %r12,PT_GR12(\regs)
1762 STREG %r13,PT_GR13(\regs)
1763 STREG %r14,PT_GR14(\regs)
1764 STREG %r15,PT_GR15(\regs)
1765 STREG %r16,PT_GR16(\regs)
1766 STREG %r17,PT_GR17(\regs)
1767 STREG %r18,PT_GR18(\regs)
1770 .macro reg_restore regs
1771 LDREG PT_GR3(\regs), %r3
1772 LDREG PT_GR4(\regs), %r4
1773 LDREG PT_GR5(\regs), %r5
1774 LDREG PT_GR6(\regs), %r6
1775 LDREG PT_GR7(\regs), %r7
1776 LDREG PT_GR8(\regs), %r8
1777 LDREG PT_GR9(\regs), %r9
1778 LDREG PT_GR10(\regs),%r10
1779 LDREG PT_GR11(\regs),%r11
1780 LDREG PT_GR12(\regs),%r12
1781 LDREG PT_GR13(\regs),%r13
1782 LDREG PT_GR14(\regs),%r14
1783 LDREG PT_GR15(\regs),%r15
1784 LDREG PT_GR16(\regs),%r16
1785 LDREG PT_GR17(\regs),%r17
1786 LDREG PT_GR18(\regs),%r18
1789 .export sys_fork_wrapper
1790 .export child_return
1792 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
1793 ldo TASK_REGS(%r1),%r1
1796 STREG %r3, PT_CR27(%r1)
1798 STREG %r2,-RP_OFFSET(%r30)
1799 ldo FRAME_SIZE(%r30),%r30
1801 ldo -16(%r30),%r29 /* Reference param save area */
1804 /* These are call-clobbered registers and therefore
1805 also syscall-clobbered (we hope). */
1806 STREG %r2,PT_GR19(%r1) /* save for child */
1807 STREG %r30,PT_GR21(%r1)
1809 LDREG PT_GR30(%r1),%r25
1814 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1816 ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */
1817 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1818 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1820 LDREG PT_CR27(%r1), %r3
1824 /* strace expects syscall # to be preserved in r20 */
1827 STREG %r20,PT_GR20(%r1)
1829 /* Set the return value for the child */
1831 BL schedule_tail, %r2
1834 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1
1835 LDREG TASK_PT_GR19(%r1),%r2
1840 .export sys_clone_wrapper
1842 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1843 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1846 STREG %r3, PT_CR27(%r1)
1848 STREG %r2,-RP_OFFSET(%r30)
1849 ldo FRAME_SIZE(%r30),%r30
1851 ldo -16(%r30),%r29 /* Reference param save area */
1854 STREG %r2,PT_GR19(%r1) /* save for child */
1855 STREG %r30,PT_GR21(%r1)
1860 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1862 .export sys_vfork_wrapper
1864 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1865 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1868 STREG %r3, PT_CR27(%r1)
1870 STREG %r2,-RP_OFFSET(%r30)
1871 ldo FRAME_SIZE(%r30),%r30
1873 ldo -16(%r30),%r29 /* Reference param save area */
1876 STREG %r2,PT_GR19(%r1) /* save for child */
1877 STREG %r30,PT_GR21(%r1)
1883 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2
1886 .macro execve_wrapper execve
1887 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1888 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1891 * Do we need to save/restore r3-r18 here?
1892 * I don't think so. why would new thread need old
1893 * threads registers?
1896 /* %arg0 - %arg3 are already saved for us. */
1898 STREG %r2,-RP_OFFSET(%r30)
1899 ldo FRAME_SIZE(%r30),%r30
1901 ldo -16(%r30),%r29 /* Reference param save area */
1906 ldo -FRAME_SIZE(%r30),%r30
1907 LDREG -RP_OFFSET(%r30),%r2
1909 /* If exec succeeded we need to load the args */
1912 cmpb,>>= %r28,%r1,error_\execve
1920 .export sys_execve_wrapper
1924 execve_wrapper sys_execve
1927 .export sys32_execve_wrapper
1928 .import sys32_execve
1930 sys32_execve_wrapper:
1931 execve_wrapper sys32_execve
1934 .export sys_rt_sigreturn_wrapper
1935 sys_rt_sigreturn_wrapper:
1936 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26
1937 ldo TASK_REGS(%r26),%r26 /* get pt regs */
1938 /* Don't save regs, we are going to restore them from sigcontext. */
1939 STREG %r2, -RP_OFFSET(%r30)
1941 ldo FRAME_SIZE(%r30), %r30
1942 BL sys_rt_sigreturn,%r2
1943 ldo -16(%r30),%r29 /* Reference param save area */
1945 BL sys_rt_sigreturn,%r2
1946 ldo FRAME_SIZE(%r30), %r30
1949 ldo -FRAME_SIZE(%r30), %r30
1950 LDREG -RP_OFFSET(%r30), %r2
1952 /* FIXME: I think we need to restore a few more things here. */
1953 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1954 ldo TASK_REGS(%r1),%r1 /* get pt regs */
1957 /* If the signal was received while the process was blocked on a
1958 * syscall, then r2 will take us to syscall_exit; otherwise r2 will
1959 * take us to syscall_exit_rfi and on to intr_return.
1962 LDREG PT_GR28(%r1),%r28 /* reload original r28 for syscall_exit */
1964 .export sys_sigaltstack_wrapper
1965 sys_sigaltstack_wrapper:
1966 /* Get the user stack pointer */
1967 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
1968 ldo TASK_REGS(%r1),%r24 /* get pt regs */
1969 LDREG TASK_PT_GR30(%r24),%r24
1970 STREG %r2, -RP_OFFSET(%r30)
1972 ldo FRAME_SIZE(%r30), %r30
1973 b,l do_sigaltstack,%r2
1974 ldo -16(%r30),%r29 /* Reference param save area */
1976 bl do_sigaltstack,%r2
1977 ldo FRAME_SIZE(%r30), %r30
1980 ldo -FRAME_SIZE(%r30), %r30
1981 LDREG -RP_OFFSET(%r30), %r2
1986 .export sys32_sigaltstack_wrapper
1987 sys32_sigaltstack_wrapper:
1988 /* Get the user stack pointer */
1989 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r24
1990 LDREG TASK_PT_GR30(%r24),%r24
1991 STREG %r2, -RP_OFFSET(%r30)
1992 ldo FRAME_SIZE(%r30), %r30
1993 b,l do_sigaltstack32,%r2
1994 ldo -16(%r30),%r29 /* Reference param save area */
1996 ldo -FRAME_SIZE(%r30), %r30
1997 LDREG -RP_OFFSET(%r30), %r2
2002 .export sys_rt_sigsuspend_wrapper
2003 sys_rt_sigsuspend_wrapper:
2004 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
2005 ldo TASK_REGS(%r1),%r24
2008 STREG %r2, -RP_OFFSET(%r30)
2010 ldo FRAME_SIZE(%r30), %r30
2011 b,l sys_rt_sigsuspend,%r2
2012 ldo -16(%r30),%r29 /* Reference param save area */
2014 bl sys_rt_sigsuspend,%r2
2015 ldo FRAME_SIZE(%r30), %r30
2018 ldo -FRAME_SIZE(%r30), %r30
2019 LDREG -RP_OFFSET(%r30), %r2
2021 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1
2022 ldo TASK_REGS(%r1),%r1
2028 .export syscall_exit
2031 /* NOTE: HP-UX syscalls also come through here
2032 * after hpux_syscall_exit fixes up return
2035 /* NOTE: Not all syscalls exit this way. rt_sigreturn will exit
2036 * via syscall_exit_rfi if the signal was received while the process
2040 /* save return value now */
2043 LDREG TI_TASK(%r1),%r1
2044 STREG %r28,TASK_PT_GR28(%r1)
2048 /* <linux/personality.h> cannot be easily included */
2049 #define PER_HPUX 0x10
2050 LDREG TASK_PERSONALITY(%r1),%r19
2052 /* We can't use "CMPIB<> PER_HPUX" since "im5" field is sign extended */
2053 ldo -PER_HPUX(%r19), %r19
2056 /* Save other hpux returns if personality is PER_HPUX */
2057 STREG %r22,TASK_PT_GR22(%r1)
2058 STREG %r29,TASK_PT_GR29(%r1)
2061 #endif /* CONFIG_HPUX */
2063 /* Seems to me that dp could be wrong here, if the syscall involved
2064 * calling a module, and nothing got round to restoring dp on return.
2070 /* Check for software interrupts */
2072 .import irq_stat,data
2074 load32 irq_stat,%r19
2077 /* sched.h: int processor */
2078 /* %r26 is used as scratch register to index into irq_stat[] */
2079 ldw TI_CPU-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 /* cpu # */
2081 /* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) bits */
2087 add %r19,%r20,%r19 /* now have &irq_stat[smp_processor_id()] */
2088 #endif /* CONFIG_SMP */
2090 LDREG IRQSTAT_SIRQ_PEND(%r19),%r20 /* hardirq.h: unsigned long */
2091 cmpib,<>,n 0,%r20,syscall_do_softirq /* forward */
2093 syscall_check_resched:
2095 /* check for reschedule */
2097 LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* long */
2098 bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */
2101 LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* get ti flags */
2102 bb,<,n %r19, 31-TIF_SIGPENDING, syscall_do_signal /* forward */
2105 /* Are we being ptraced? */
2106 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2108 LDREG TASK_PTRACE(%r1), %r19
2109 bb,< %r19,31,syscall_restore_rfi
2112 ldo TASK_PT_FR31(%r1),%r19 /* reload fpregs */
2115 LDREG TASK_PT_SAR(%r1),%r19 /* restore SAR */
2118 LDREG TASK_PT_GR2(%r1),%r2 /* restore user rp */
2119 LDREG TASK_PT_GR19(%r1),%r19
2120 LDREG TASK_PT_GR20(%r1),%r20
2121 LDREG TASK_PT_GR21(%r1),%r21
2122 LDREG TASK_PT_GR22(%r1),%r22
2123 LDREG TASK_PT_GR23(%r1),%r23
2124 LDREG TASK_PT_GR24(%r1),%r24
2125 LDREG TASK_PT_GR25(%r1),%r25
2126 LDREG TASK_PT_GR26(%r1),%r26
2127 LDREG TASK_PT_GR27(%r1),%r27 /* restore user dp */
2128 LDREG TASK_PT_GR28(%r1),%r28 /* syscall return value */
2129 LDREG TASK_PT_GR29(%r1),%r29
2130 LDREG TASK_PT_GR31(%r1),%r31 /* restore syscall rp */
2132 /* NOTE: We use rsm/ssm pair to make this operation atomic */
2134 LDREG TASK_PT_GR30(%r1),%r30 /* restore user sp */
2135 mfsp %sr3,%r1 /* Get users space id */
2136 mtsp %r1,%sr7 /* Restore sr7 */
2139 /* Set sr2 to zero for userspace syscalls to work. */
2141 mtsp %r1,%sr4 /* Restore sr4 */
2142 mtsp %r1,%sr5 /* Restore sr5 */
2143 mtsp %r1,%sr6 /* Restore sr6 */
2145 depi 3,31,2,%r31 /* ensure return to user mode. */
2148 /* decide whether to reset the wide mode bit
2150 * For a syscall, the W bit is stored in the lowest bit
2151 * of sp. Extract it and reset W if it is zero */
2152 extrd,u,*<> %r30,63,1,%r1
2154 /* now reset the lowest bit of sp if it was set */
2157 be,n 0(%sr3,%r31) /* return to user space */
2159 /* We have to return via an RFI, so that PSW T and R bits can be set
2161 * This sets up pt_regs so we can return via intr_restore, which is not
2162 * the most efficient way of doing things, but it works.
2164 syscall_restore_rfi:
2165 ldo -1(%r0),%r2 /* Set recovery cntr to -1 */
2166 mtctl %r2,%cr0 /* for immediate trap */
2167 LDREG TASK_PT_PSW(%r1),%r2 /* Get old PSW */
2168 ldi 0x0b,%r20 /* Create new PSW */
2169 depi -1,13,1,%r20 /* C, Q, D, and I bits */
2171 /* The values of PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are
2172 * set in include/linux/ptrace.h and converted to PA bitmap
2173 * numbers in asm-offsets.c */
2175 /* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */
2176 extru,= %r19,PA_SINGLESTEP_BIT,1,%r0
2177 depi -1,27,1,%r20 /* R bit */
2179 /* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */
2180 extru,= %r19,PA_BLOCKSTEP_BIT,1,%r0
2181 depi -1,7,1,%r20 /* T bit */
2183 STREG %r20,TASK_PT_PSW(%r1)
2185 /* Always store space registers, since sr3 can be changed (e.g. fork) */
2188 STREG %r25,TASK_PT_SR3(%r1)
2189 STREG %r25,TASK_PT_SR4(%r1)
2190 STREG %r25,TASK_PT_SR5(%r1)
2191 STREG %r25,TASK_PT_SR6(%r1)
2192 STREG %r25,TASK_PT_SR7(%r1)
2193 STREG %r25,TASK_PT_IASQ0(%r1)
2194 STREG %r25,TASK_PT_IASQ1(%r1)
2197 /* Now if old D bit is clear, it means we didn't save all registers
2198 * on syscall entry, so do that now. This only happens on TRACEME
2199 * calls, or if someone attached to us while we were on a syscall.
2200 * We could make this more efficient by not saving r3-r18, but
2201 * then we wouldn't be able to use the common intr_restore path.
2202 * It is only for traced processes anyway, so performance is not
2205 bb,< %r2,30,pt_regs_ok /* Branch if D set */
2206 ldo TASK_REGS(%r1),%r25
2207 reg_save %r25 /* Save r3 to r18 */
2209 /* Save the current sr */
2211 STREG %r2,TASK_PT_SR0(%r1)
2213 /* Save the scratch sr */
2215 STREG %r2,TASK_PT_SR1(%r1)
2217 /* sr2 should be set to zero for userspace syscalls */
2218 STREG %r0,TASK_PT_SR2(%r1)
2221 LDREG TASK_PT_GR31(%r1),%r2
2222 depi 3,31,2,%r2 /* ensure return to user mode. */
2223 STREG %r2,TASK_PT_IAOQ0(%r1)
2225 STREG %r2,TASK_PT_IAOQ1(%r1)
2230 .import do_softirq,code
2234 /* NOTE: We enable I-bit incase we schedule later,
2235 * and we might be going back to userspace if we were
2237 b syscall_check_resched
2238 ssm PSW_SM_I, %r0 /* do_softirq returns with I bit off */
2240 .import schedule,code
2244 ldo -16(%r30),%r29 /* Reference param save area */
2248 b syscall_check_bh /* if resched, we start over again */
2251 .import do_signal,code
2253 /* Save callee-save registers (for sigcontext).
2254 FIXME: After this point the process structure should be
2255 consistent with all the relevant state of the process
2256 before the syscall. We need to verify this. */
2257 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2258 ldo TASK_REGS(%r1), %r25 /* struct pt_regs *regs */
2261 ldi 1, %r24 /* unsigned long in_syscall */
2264 ldo -16(%r30),%r29 /* Reference param save area */
2267 copy %r0, %r26 /* sigset_t *oldset = NULL */
2269 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1
2270 ldo TASK_REGS(%r1), %r20 /* reload pt_regs */
2273 b,n syscall_check_sig
2276 * get_register is used by the non access tlb miss handlers to
2277 * copy the value of the general register specified in r8 into
2278 * r1. This routine can't be used for shadowed registers, since
2279 * the rfir will restore the original value. So, for the shadowed
2280 * registers we put a -1 into r1 to indicate that the register
2281 * should not be used (the register being copied could also have
2282 * a -1 in it, but that is OK, it just means that we will have
2283 * to use the slow path instead).
2289 bv %r0(%r25) /* r0 */
2291 bv %r0(%r25) /* r1 - shadowed */
2293 bv %r0(%r25) /* r2 */
2295 bv %r0(%r25) /* r3 */
2297 bv %r0(%r25) /* r4 */
2299 bv %r0(%r25) /* r5 */
2301 bv %r0(%r25) /* r6 */
2303 bv %r0(%r25) /* r7 */
2305 bv %r0(%r25) /* r8 - shadowed */
2307 bv %r0(%r25) /* r9 - shadowed */
2309 bv %r0(%r25) /* r10 */
2311 bv %r0(%r25) /* r11 */
2313 bv %r0(%r25) /* r12 */
2315 bv %r0(%r25) /* r13 */
2317 bv %r0(%r25) /* r14 */
2319 bv %r0(%r25) /* r15 */
2321 bv %r0(%r25) /* r16 - shadowed */
2323 bv %r0(%r25) /* r17 - shadowed */
2325 bv %r0(%r25) /* r18 */
2327 bv %r0(%r25) /* r19 */
2329 bv %r0(%r25) /* r20 */
2331 bv %r0(%r25) /* r21 */
2333 bv %r0(%r25) /* r22 */
2335 bv %r0(%r25) /* r23 */
2337 bv %r0(%r25) /* r24 - shadowed */
2339 bv %r0(%r25) /* r25 - shadowed */
2341 bv %r0(%r25) /* r26 */
2343 bv %r0(%r25) /* r27 */
2345 bv %r0(%r25) /* r28 */
2347 bv %r0(%r25) /* r29 */
2349 bv %r0(%r25) /* r30 */
2351 bv %r0(%r25) /* r31 */
2355 * set_register is used by the non access tlb miss handlers to
2356 * copy the value of r1 into the general register specified in
2363 bv %r0(%r25) /* r0 (silly, but it is a place holder) */
2365 bv %r0(%r25) /* r1 */
2367 bv %r0(%r25) /* r2 */
2369 bv %r0(%r25) /* r3 */
2371 bv %r0(%r25) /* r4 */
2373 bv %r0(%r25) /* r5 */
2375 bv %r0(%r25) /* r6 */
2377 bv %r0(%r25) /* r7 */
2379 bv %r0(%r25) /* r8 */
2381 bv %r0(%r25) /* r9 */
2383 bv %r0(%r25) /* r10 */
2385 bv %r0(%r25) /* r11 */
2387 bv %r0(%r25) /* r12 */
2389 bv %r0(%r25) /* r13 */
2391 bv %r0(%r25) /* r14 */
2393 bv %r0(%r25) /* r15 */
2395 bv %r0(%r25) /* r16 */
2397 bv %r0(%r25) /* r17 */
2399 bv %r0(%r25) /* r18 */
2401 bv %r0(%r25) /* r19 */
2403 bv %r0(%r25) /* r20 */
2405 bv %r0(%r25) /* r21 */
2407 bv %r0(%r25) /* r22 */
2409 bv %r0(%r25) /* r23 */
2411 bv %r0(%r25) /* r24 */
2413 bv %r0(%r25) /* r25 */
2415 bv %r0(%r25) /* r26 */
2417 bv %r0(%r25) /* r27 */
2419 bv %r0(%r25) /* r28 */
2421 bv %r0(%r25) /* r29 */
2423 bv %r0(%r25) /* r30 */
2425 bv %r0(%r25) /* r31 */