/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Linux/PA-RISC Project (http://www.parisc-linux.org/) * * kernel entry points (interruptions, system call wrappers) * Copyright (C) 1999,2000 Philipp Rumpf * Copyright (C) 1999 SuSE GmbH Nuernberg * Copyright (C) 2000 Hewlett-Packard (John Marvin) * Copyright (C) 1999 Hewlett-Packard (Frank Rowand) */ #include /* we have the following possibilities to act on an interruption: * - handle in assembly and use shadowed registers only * - save registers to kernel stack and handle in assembly or C */ #include #include /* for L1_CACHE_SHIFT */ #include /* for LDREG/STREG defines */ #include #include #include #include #include #include #include #include #ifdef CONFIG_64BIT .level 2.0w #else .level 2.0 #endif /* Get aligned page_table_lock address for this mm from cr28/tr4 */ .macro get_ptl reg mfctl %cr28,\reg .endm /* space_to_prot macro creates a prot id from a space id */ #if (SPACEID_SHIFT) == 0 .macro space_to_prot spc prot depd,z \spc,62,31,\prot .endm #else .macro space_to_prot spc prot extrd,u \spc,(64 - (SPACEID_SHIFT)),32,\prot .endm #endif /* * The "get_stack" macros are responsible for determining the * kernel stack value. * * If sr7 == 0 * Already using a kernel stack, so call the * get_stack_use_r30 macro to push a pt_regs structure * on the stack, and store registers there. * else * Need to set up a kernel stack, so call the * get_stack_use_cr30 macro to set up a pointer * to the pt_regs structure contained within the * task pointer pointed to by cr30. Load the stack * pointer from the task structure. * * Note that we use shadowed registers for temps until * we can save %r26 and %r29. %r26 is used to preserve * %r8 (a shadowed register) which temporarily contained * either the fault type ("code") or the eirr. We need * to use a non-shadowed register to carry the value over * the rfir in virt_map. We use %r26 since this value winds * up being passed as the argument to either do_cpu_irq_mask * or handle_interruption. %r29 is used to hold a pointer * the register save area, and once again, it needs to * be a non-shadowed register so that it survives the rfir. */ .macro get_stack_use_cr30 /* we save the registers in the task struct */ copy %r30, %r17 mfctl %cr30, %r1 tophys %r1,%r9 /* task_struct */ LDREG TASK_STACK(%r9),%r30 ldo PT_SZ_ALGN(%r30),%r30 mtsp %r0,%sr7 /* clear sr7 after kernel stack was set! */ mtsp %r16,%sr3 ldo TASK_REGS(%r9),%r9 STREG %r17,PT_GR30(%r9) STREG %r29,PT_GR29(%r9) STREG %r26,PT_GR26(%r9) STREG %r16,PT_SR7(%r9) copy %r9,%r29 .endm .macro get_stack_use_r30 /* we put a struct pt_regs on the stack and save the registers there */ tophys %r30,%r9 copy %r30,%r1 ldo PT_SZ_ALGN(%r30),%r30 STREG %r1,PT_GR30(%r9) STREG %r29,PT_GR29(%r9) STREG %r26,PT_GR26(%r9) STREG %r16,PT_SR7(%r9) copy %r9,%r29 .endm .macro rest_stack LDREG PT_GR1(%r29), %r1 LDREG PT_GR30(%r29),%r30 LDREG PT_GR29(%r29),%r29 .endm /* default interruption handler * (calls traps.c:handle_interruption) */ .macro def code b intr_save ldi \code, %r8 .align 32 .endm /* Interrupt interruption handler * (calls irq.c:do_cpu_irq_mask) */ .macro extint code b intr_extint mfsp %sr7,%r16 .align 32 .endm .import os_hpmc, code /* HPMC handler */ .macro hpmc code nop /* must be a NOP, will be patched later */ load32 PA(os_hpmc), %r3 bv,n 0(%r3) nop .word 0 /* checksum (will be patched) */ .word 0 /* address of handler */ .word 0 /* length of handler */ .endm /* * Performance Note: Instructions will be moved up into * this part of the code later on, once we are sure * that the tlb miss handlers are close to final form. */ /* Register definitions for tlb miss handler macros */ va = r8 /* virtual address for which the trap occurred */ spc = r24 /* space for which the trap occurred */ #ifndef CONFIG_64BIT /* * itlb miss interruption handler (parisc 1.1 - 32 bit) */ .macro itlb_11 code mfctl %pcsq, spc b itlb_miss_11 mfctl %pcoq, va .align 32 .endm #endif /* * itlb miss interruption handler (parisc 2.0) */ .macro itlb_20 code mfctl %pcsq, spc #ifdef CONFIG_64BIT b itlb_miss_20w #else b itlb_miss_20 #endif mfctl %pcoq, va .align 32 .endm #ifndef CONFIG_64BIT /* * naitlb miss interruption handler (parisc 1.1 - 32 bit) */ .macro naitlb_11 code mfctl %isr,spc b naitlb_miss_11 mfctl %ior,va .align 32 .endm #endif /* * naitlb miss interruption handler (parisc 2.0) */ .macro naitlb_20 code mfctl %isr,spc #ifdef CONFIG_64BIT b naitlb_miss_20w #else b naitlb_miss_20 #endif mfctl %ior,va .align 32 .endm #ifndef CONFIG_64BIT /* * dtlb miss interruption handler (parisc 1.1 - 32 bit) */ .macro dtlb_11 code mfctl %isr, spc b dtlb_miss_11 mfctl %ior, va .align 32 .endm #endif /* * dtlb miss interruption handler (parisc 2.0) */ .macro dtlb_20 code mfctl %isr, spc #ifdef CONFIG_64BIT b dtlb_miss_20w #else b dtlb_miss_20 #endif mfctl %ior, va .align 32 .endm #ifndef CONFIG_64BIT /* nadtlb miss interruption handler (parisc 1.1 - 32 bit) */ .macro nadtlb_11 code mfctl %isr,spc b nadtlb_miss_11 mfctl %ior,va .align 32 .endm #endif /* nadtlb miss interruption handler (parisc 2.0) */ .macro nadtlb_20 code mfctl %isr,spc #ifdef CONFIG_64BIT b nadtlb_miss_20w #else b nadtlb_miss_20 #endif mfctl %ior,va .align 32 .endm #ifndef CONFIG_64BIT /* * dirty bit trap interruption handler (parisc 1.1 - 32 bit) */ .macro dbit_11 code mfctl %isr,spc b dbit_trap_11 mfctl %ior,va .align 32 .endm #endif /* * dirty bit trap interruption handler (parisc 2.0) */ .macro dbit_20 code mfctl %isr,spc #ifdef CONFIG_64BIT b dbit_trap_20w #else b dbit_trap_20 #endif mfctl %ior,va .align 32 .endm /* In LP64, the space contains part of the upper 32 bits of the * fault. We have to extract this and place it in the va, * zeroing the corresponding bits in the space register */ .macro space_adjust spc,va,tmp #ifdef CONFIG_64BIT extrd,u \spc,63,SPACEID_SHIFT,\tmp depd %r0,63,SPACEID_SHIFT,\spc depd \tmp,31,SPACEID_SHIFT,\va #endif .endm .import swapper_pg_dir,code /* Get the pgd. For faults on space zero (kernel space), this * is simply swapper_pg_dir. For user space faults, the * pgd is stored in %cr25 */ .macro get_pgd spc,reg ldil L%PA(swapper_pg_dir),\reg ldo R%PA(swapper_pg_dir)(\reg),\reg or,COND(=) %r0,\spc,%r0 mfctl %cr25,\reg .endm /* space_check(spc,tmp,fault) spc - The space we saw the fault with. tmp - The place to store the current space. fault - Function to call on failure. Only allow faults on different spaces from the currently active one if we're the kernel */ .macro space_check spc,tmp,fault mfsp %sr7,\tmp /* check against %r0 which is same value as LINUX_GATEWAY_SPACE */ or,COND(<>) %r0,\spc,%r0 /* user may execute gateway page * as kernel, so defeat the space * check if it is */ copy \spc,\tmp or,COND(=) %r0,\tmp,%r0 /* nullify if executing as kernel */ cmpb,COND(<>),n \tmp,\spc,\fault .endm /* Look up a PTE in a 2-Level scheme (faulting at each * level if the entry isn't present * * NOTE: we use ldw even for LP64, since the short pointers * can address up to 1TB */ .macro L2_ptep pmd,pte,index,va,fault #if CONFIG_PGTABLE_LEVELS == 3 extru \va,31-ASM_PMD_SHIFT,ASM_BITS_PER_PMD,\index #else # if defined(CONFIG_64BIT) extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index #else # if PAGE_SIZE > 4096 extru \va,31-ASM_PGDIR_SHIFT,32-ASM_PGDIR_SHIFT,\index # else extru \va,31-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index # endif # endif #endif dep %r0,31,PAGE_SHIFT,\pmd /* clear offset */ #if CONFIG_PGTABLE_LEVELS < 3 copy %r0,\pte #endif ldw,s \index(\pmd),\pmd bb,>=,n \pmd,_PxD_PRESENT_BIT,\fault dep %r0,31,PxD_FLAG_SHIFT,\pmd /* clear flags */ SHLREG \pmd,PxD_VALUE_SHIFT,\pmd extru \va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index dep %r0,31,PAGE_SHIFT,\pmd /* clear offset */ shladd \index,BITS_PER_PTE_ENTRY,\pmd,\pmd /* pmd is now pte */ .endm /* Look up PTE in a 3-Level scheme. */ .macro L3_ptep pgd,pte,index,va,fault #if CONFIG_PGTABLE_LEVELS == 3 copy %r0,\pte extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index ldw,s \index(\pgd),\pgd bb,>=,n \pgd,_PxD_PRESENT_BIT,\fault shld \pgd,PxD_VALUE_SHIFT,\pgd #endif L2_ptep \pgd,\pte,\index,\va,\fault .endm /* Acquire page_table_lock and check page is present. */ .macro ptl_lock spc,ptp,pte,tmp,tmp1,fault #ifdef CONFIG_TLB_PTLOCK 98: cmpib,COND(=),n 0,\spc,2f get_ptl \tmp 1: LDCW 0(\tmp),\tmp1 cmpib,COND(=) 0,\tmp1,1b nop LDREG 0(\ptp),\pte bb,<,n \pte,_PAGE_PRESENT_BIT,3f b \fault stw \spc,0(\tmp) 99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP) #endif 2: LDREG 0(\ptp),\pte bb,>=,n \pte,_PAGE_PRESENT_BIT,\fault 3: .endm /* Release page_table_lock without reloading lock address. Note that the values in the register spc are limited to NR_SPACE_IDS (262144). Thus, the stw instruction always stores a nonzero value even when register spc is 64 bits. We use an ordered store to ensure all prior accesses are performed prior to releasing the lock. */ .macro ptl_unlock0 spc,tmp #ifdef CONFIG_TLB_PTLOCK 98: or,COND(=) %r0,\spc,%r0 stw,ma \spc,0(\tmp) 99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP) #endif .endm /* Release page_table_lock. */ .macro ptl_unlock1 spc,tmp #ifdef CONFIG_TLB_PTLOCK 98: get_ptl \tmp ptl_unlock0 \spc,\tmp 99: ALTERNATIVE(98b, 99b, ALT_COND_NO_SMP, INSN_NOP) #endif .endm /* Set the _PAGE_ACCESSED bit of the PTE. Be clever and * don't needlessly dirty the cache line if it was already set */ .macro update_accessed ptp,pte,tmp,tmp1 ldi _PAGE_ACCESSED,\tmp1 or \tmp1,\pte,\tmp and,COND(<>) \tmp1,\pte,%r0 STREG \tmp,0(\ptp) .endm /* Set the dirty bit (and accessed bit). No need to be * clever, this is only used from the dirty fault */ .macro update_dirty ptp,pte,tmp ldi _PAGE_ACCESSED|_PAGE_DIRTY,\tmp or \tmp,\pte,\pte STREG \pte,0(\ptp) .endm /* We have (depending on the page size): * - 38 to 52-bit Physical Page Number * - 12 to 26-bit page offset */ /* bitshift difference between a PFN (based on kernel's PAGE_SIZE) * to a CPU TLB 4k PFN (4k => 12 bits to shift) */ #define PAGE_ADD_SHIFT (PAGE_SHIFT-12) #define PAGE_ADD_HUGE_SHIFT (REAL_HPAGE_SHIFT-12) /* Drop prot bits and convert to page addr for iitlbt and idtlbt */ .macro convert_for_tlb_insert20 pte,tmp #ifdef CONFIG_HUGETLB_PAGE copy \pte,\tmp extrd,u \tmp,(63-ASM_PFN_PTE_SHIFT)+(63-58)+PAGE_ADD_SHIFT,\ 64-PAGE_SHIFT-PAGE_ADD_SHIFT,\pte depdi _PAGE_SIZE_ENCODING_DEFAULT,63,\ (63-58)+PAGE_ADD_SHIFT,\pte extrd,u,*= \tmp,_PAGE_HPAGE_BIT+32,1,%r0 depdi _HUGE_PAGE_SIZE_ENCODING_DEFAULT,63,\ (63-58)+PAGE_ADD_HUGE_SHIFT,\pte #else /* Huge pages disabled */ extrd,u \pte,(63-ASM_PFN_PTE_SHIFT)+(63-58)+PAGE_ADD_SHIFT,\ 64-PAGE_SHIFT-PAGE_ADD_SHIFT,\pte depdi _PAGE_SIZE_ENCODING_DEFAULT,63,\ (63-58)+PAGE_ADD_SHIFT,\pte #endif .endm /* Convert the pte and prot to tlb insertion values. How * this happens is quite subtle, read below */ .macro make_insert_tlb spc,pte,prot,tmp space_to_prot \spc \prot /* create prot id from space */ /* The following is the real subtlety. This is depositing * T <-> _PAGE_REFTRAP * D <-> _PAGE_DIRTY * B <-> _PAGE_DMB (memory break) * * Then incredible subtlety: The access rights are * _PAGE_GATEWAY, _PAGE_EXEC and _PAGE_WRITE * See 3-14 of the parisc 2.0 manual * * Finally, _PAGE_READ goes in the top bit of PL1 (so we * trigger an access rights trap in user space if the user * tries to read an unreadable page */ depd \pte,8,7,\prot /* PAGE_USER indicates the page can be read with user privileges, * so deposit X1|11 to PL1|PL2 (remember the upper bit of PL1 * contains _PAGE_READ) */ extrd,u,*= \pte,_PAGE_USER_BIT+32,1,%r0 depdi 7,11,3,\prot /* If we're a gateway page, drop PL2 back to zero for promotion * to kernel privilege (so we can execute the page as kernel). * Any privilege promotion page always denys read and write */ extrd,u,*= \pte,_PAGE_GATEWAY_BIT+32,1,%r0 depd %r0,11,2,\prot /* If Gateway, Set PL2 to 0 */ /* Enforce uncacheable pages. * This should ONLY be use for MMIO on PA 2.0 machines. * Memory/DMA is cache coherent on all PA2.0 machines we support * (that means T-class is NOT supported) and the memory controllers * on most of those machines only handles cache transactions. */ extrd,u,*= \pte,_PAGE_NO_CACHE_BIT+32,1,%r0 depdi 1,12,1,\prot /* Drop prot bits and convert to page addr for iitlbt and idtlbt */ convert_for_tlb_insert20 \pte \tmp .endm /* Identical macro to make_insert_tlb above, except it * makes the tlb entry for the differently formatted pa11 * insertion instructions */ .macro make_insert_tlb_11 spc,pte,prot zdep \spc,30,15,\prot dep \pte,8,7,\prot extru,= \pte,_PAGE_NO_CACHE_BIT,1,%r0 depi 1,12,1,\prot extru,= \pte,_PAGE_USER_BIT,1,%r0 depi 7,11,3,\prot /* Set for user space (1 rsvd for read) */ extru,= \pte,_PAGE_GATEWAY_BIT,1,%r0 depi 0,11,2,\prot /* If Gateway, Set PL2 to 0 */ /* Get rid of prot bits and convert to page addr for iitlba */ depi 0,31,ASM_PFN_PTE_SHIFT,\pte SHRREG \pte,(ASM_PFN_PTE_SHIFT-(31-26)),\pte .endm /* This is for ILP32 PA2.0 only. The TLB insertion needs * to extend into I/O space if the address is 0xfXXXXXXX * so we extend the f's into the top word of the pte in * this case */ .macro f_extend pte,tmp extrd,s \pte,42,4,\tmp addi,<> 1,\tmp,%r0 extrd,s \pte,63,25,\pte .endm /* The alias region is an 8MB aligned 16MB to do clear and * copy user pages at addresses congruent with the user * virtual address. * * To use the alias page, you set %r26 up with the to TLB * entry (identifying the physical page) and %r23 up with * the from tlb entry (or nothing if only a to entry---for * clear_user_page_asm) */ .macro do_alias spc,tmp,tmp1,va,pte,prot,fault,patype cmpib,COND(<>),n 0,\spc,\fault ldil L%(TMPALIAS_MAP_START),\tmp #if defined(CONFIG_64BIT) && (TMPALIAS_MAP_START >= 0x80000000) /* on LP64, ldi will sign extend into the upper 32 bits, * which is behaviour we don't want */ depdi 0,31,32,\tmp #endif copy \va,\tmp1 depi 0,31,23,\tmp1 cmpb,COND(<>),n \tmp,\tmp1,\fault mfctl %cr19,\tmp /* iir */ /* get the opcode (first six bits) into \tmp */ extrw,u \tmp,5,6,\tmp /* * Only setting the T bit prevents data cache movein * Setting access rights to zero prevents instruction cache movein * * Note subtlety here: _PAGE_GATEWAY, _PAGE_EXEC and _PAGE_WRITE go * to type field and _PAGE_READ goes to top bit of PL1 */ ldi (_PAGE_REFTRAP|_PAGE_READ|_PAGE_WRITE),\prot /* * so if the opcode is one (i.e. this is a memory management * instruction) nullify the next load so \prot is only T. * Otherwise this is a normal data operation */ cmpiclr,= 0x01,\tmp,%r0 ldi (_PAGE_DIRTY|_PAGE_READ|_PAGE_WRITE),\prot .ifc \patype,20 depd,z \prot,8,7,\prot .else .ifc \patype,11 depw,z \prot,8,7,\prot .else .error "undefined PA type to do_alias" .endif .endif /* * OK, it is in the temp alias region, check whether "from" or "to". * Check "subtle" note in pacache.S re: r23/r26. */ #ifdef CONFIG_64BIT extrd,u,*= \va,41,1,%r0 #else extrw,u,= \va,9,1,%r0 #endif or,COND(tr) %r23,%r0,\pte or %r26,%r0,\pte .endm /* * Fault_vectors are architecturally required to be aligned on a 2K * boundary */ .section .text.hot .align 2048 ENTRY(fault_vector_20) /* First vector is invalid (0) */ .ascii "cows can fly" .byte 0 .align 32 hpmc 1 def 2 def 3 extint 4 def 5 itlb_20 PARISC_ITLB_TRAP def 7 def 8 def 9 def 10 def 11 def 12 def 13 def 14 dtlb_20 15 naitlb_20 16 nadtlb_20 17 def 18 def 19 dbit_20 20 def 21 def 22 def 23 def 24 def 25 def 26 def 27 def 28 def 29 def 30 def 31 END(fault_vector_20) #ifndef CONFIG_64BIT .align 2048 ENTRY(fault_vector_11) /* First vector is invalid (0) */ .ascii "cows can fly" .byte 0 .align 32 hpmc 1 def 2 def 3 extint 4 def 5 itlb_11 PARISC_ITLB_TRAP def 7 def 8 def 9 def 10 def 11 def 12 def 13 def 14 dtlb_11 15 naitlb_11 16 nadtlb_11 17 def 18 def 19 dbit_11 20 def 21 def 22 def 23 def 24 def 25 def 26 def 27 def 28 def 29 def 30 def 31 END(fault_vector_11) #endif /* Fault vector is separately protected and *must* be on its own page */ .align PAGE_SIZE .import handle_interruption,code .import do_cpu_irq_mask,code /* * Child Returns here * * copy_thread moved args into task save area. */ ENTRY(ret_from_kernel_thread) /* Call schedule_tail first though */ BL schedule_tail, %r2 nop mfctl %cr30,%r1 /* task_struct */ LDREG TASK_PT_GR25(%r1), %r26 #ifdef CONFIG_64BIT LDREG TASK_PT_GR27(%r1), %r27 #endif LDREG TASK_PT_GR26(%r1), %r1 ble 0(%sr7, %r1) copy %r31, %r2 b finish_child_return nop END(ret_from_kernel_thread) /* * struct task_struct *_switch_to(struct task_struct *prev, * struct task_struct *next) * * switch kernel stacks and return prev */ ENTRY_CFI(_switch_to) STREG %r2, -RP_OFFSET(%r30) callee_save_float callee_save load32 _switch_to_ret, %r2 STREG %r2, TASK_PT_KPC(%r26) LDREG TASK_PT_KPC(%r25), %r2 STREG %r30, TASK_PT_KSP(%r26) LDREG TASK_PT_KSP(%r25), %r30 bv %r0(%r2) mtctl %r25,%cr30 ENTRY(_switch_to_ret) mtctl %r0, %cr0 /* Needed for single stepping */ callee_rest callee_rest_float LDREG -RP_OFFSET(%r30), %r2 bv %r0(%r2) copy %r26, %r28 ENDPROC_CFI(_switch_to) /* * Common rfi return path for interruptions, kernel execve, and * sys_rt_sigreturn (sometimes). The sys_rt_sigreturn syscall will * return via this path if the signal was received when the process * was running; if the process was blocked on a syscall then the * normal syscall_exit path is used. All syscalls for traced * proceses exit via intr_restore. * * XXX If any syscalls that change a processes space id ever exit * this way, then we will need to copy %sr3 in to PT_SR[3..7], and * adjust IASQ[0..1]. * */ .align PAGE_SIZE ENTRY_CFI(syscall_exit_rfi) mfctl %cr30,%r16 /* task_struct */ ldo TASK_REGS(%r16),%r16 /* Force iaoq to userspace, as the user has had access to our current * context via sigcontext. Also Filter the PSW for the same reason. */ LDREG PT_IAOQ0(%r16),%r19 depi PRIV_USER,31,2,%r19 STREG %r19,PT_IAOQ0(%r16) LDREG PT_IAOQ1(%r16),%r19 depi PRIV_USER,31,2,%r19 STREG %r19,PT_IAOQ1(%r16) LDREG PT_PSW(%r16),%r19 load32 USER_PSW_MASK,%r1 #ifdef CONFIG_64BIT load32 USER_PSW_HI_MASK,%r20 depd %r20,31,32,%r1 #endif and %r19,%r1,%r19 /* Mask out bits that user shouldn't play with */ load32 USER_PSW,%r1 or %r19,%r1,%r19 /* Make sure default USER_PSW bits are set */ STREG %r19,PT_PSW(%r16) /* * If we aren't being traced, we never saved space registers * (we don't store them in the sigcontext), so set them * to "proper" values now (otherwise we'll wind up restoring * whatever was last stored in the task structure, which might * be inconsistent if an interrupt occurred while on the gateway * page). Note that we may be "trashing" values the user put in * them, but we don't support the user changing them. */ STREG %r0,PT_SR2(%r16) mfsp %sr3,%r19 STREG %r19,PT_SR0(%r16) STREG %r19,PT_SR1(%r16) STREG %r19,PT_SR3(%r16) STREG %r19,PT_SR4(%r16) STREG %r19,PT_SR5(%r16) STREG %r19,PT_SR6(%r16) STREG %r19,PT_SR7(%r16) ENTRY(intr_return) /* check for reschedule */ mfctl %cr30,%r1 LDREG TASK_TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */ bb,<,n %r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */ .import do_notify_resume,code intr_check_sig: /* As above */ mfctl %cr30,%r1 LDREG TASK_TI_FLAGS(%r1),%r19 ldi (_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r20 and,COND(<>) %r19, %r20, %r0 b,n intr_restore /* skip past if we've nothing to do */ /* This check is critical to having LWS * working. The IASQ is zero on the gateway * page and we cannot deliver any signals until * we get off the gateway page. * * Only do signals if we are returning to user space */ LDREG PT_IASQ0(%r16), %r20 cmpib,COND(=),n LINUX_GATEWAY_SPACE, %r20, intr_restore /* forward */ LDREG PT_IASQ1(%r16), %r20 cmpib,COND(=),n LINUX_GATEWAY_SPACE, %r20, intr_restore /* forward */ copy %r0, %r25 /* long in_syscall = 0 */ #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ #endif /* NOTE: We need to enable interrupts if we have to deliver * signals. We used to do this earlier but it caused kernel * stack overflows. */ ssm PSW_SM_I, %r0 BL do_notify_resume,%r2 copy %r16, %r26 /* struct pt_regs *regs */ b,n intr_check_sig intr_restore: copy %r16,%r29 ldo PT_FR31(%r29),%r1 rest_fp %r1 rest_general %r29 /* inverse of virt_map */ pcxt_ssm_bug rsm PSW_SM_QUIET,%r0 /* prepare for rfi */ tophys_r1 %r29 /* Restore space id's and special cr's from PT_REGS * structure pointed to by r29 */ rest_specials %r29 /* IMPORTANT: rest_stack restores r29 last (we are using it)! * It also restores r1 and r30. */ rest_stack rfi nop #ifndef CONFIG_PREEMPTION # define intr_do_preempt intr_restore #endif /* !CONFIG_PREEMPTION */ .import schedule,code intr_do_resched: /* Only call schedule on return to userspace. If we're returning * to kernel space, we may schedule if CONFIG_PREEMPTION, otherwise * we jump back to intr_restore. */ LDREG PT_IASQ0(%r16), %r20 cmpib,COND(=) 0, %r20, intr_do_preempt nop LDREG PT_IASQ1(%r16), %r20 cmpib,COND(=) 0, %r20, intr_do_preempt nop /* NOTE: We need to enable interrupts if we schedule. We used * to do this earlier but it caused kernel stack overflows. */ ssm PSW_SM_I, %r0 #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ #endif ldil L%intr_check_sig, %r2 #ifndef CONFIG_64BIT b schedule #else load32 schedule, %r20 bv %r0(%r20) #endif ldo R%intr_check_sig(%r2), %r2 /* preempt the current task on returning to kernel * mode from an interrupt, iff need_resched is set, * and preempt_count is 0. otherwise, we continue on * our merry way back to the current running task. */ #ifdef CONFIG_PREEMPTION .import preempt_schedule_irq,code intr_do_preempt: rsm PSW_SM_I, %r0 /* disable interrupts */ /* current_thread_info()->preempt_count */ mfctl %cr30, %r1 ldw TI_PRE_COUNT(%r1), %r19 cmpib,<> 0, %r19, intr_restore /* if preempt_count > 0 */ nop /* prev insn branched backwards */ /* check if we interrupted a critical path */ LDREG PT_PSW(%r16), %r20 bb,<,n %r20, 31 - PSW_SM_I, intr_restore nop /* ssm PSW_SM_I done later in intr_restore */ #ifdef CONFIG_MLONGCALLS ldil L%intr_restore, %r2 load32 preempt_schedule_irq, %r1 bv %r0(%r1) ldo R%intr_restore(%r2), %r2 #else ldil L%intr_restore, %r1 BL preempt_schedule_irq, %r2 ldo R%intr_restore(%r1), %r2 #endif #endif /* CONFIG_PREEMPTION */ /* * External interrupts. */ intr_extint: cmpib,COND(=),n 0,%r16,1f get_stack_use_cr30 b,n 2f 1: get_stack_use_r30 2: save_specials %r29 virt_map save_general %r29 ldo PT_FR0(%r29), %r24 save_fp %r24 loadgp copy %r29, %r26 /* arg0 is pt_regs */ copy %r29, %r16 /* save pt_regs */ ldil L%intr_return, %r2 #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ #endif b do_cpu_irq_mask ldo R%intr_return(%r2), %r2 /* return to intr_return, not here */ ENDPROC_CFI(syscall_exit_rfi) /* Generic interruptions (illegal insn, unaligned, page fault, etc) */ ENTRY_CFI(intr_save) /* for os_hpmc */ mfsp %sr7,%r16 cmpib,COND(=),n 0,%r16,1f get_stack_use_cr30 b 2f copy %r8,%r26 1: get_stack_use_r30 copy %r8,%r26 2: save_specials %r29 /* If this trap is a itlb miss, skip saving/adjusting isr/ior */ cmpib,COND(=),n PARISC_ITLB_TRAP,%r26,skip_save_ior mfctl %isr, %r16 nop /* serialize mfctl on PA 2.0 to avoid 4 cycle penalty */ mfctl %ior, %r17 #ifdef CONFIG_64BIT /* * If the interrupted code was running with W bit off (32 bit), * clear the b bits (bits 0 & 1) in the ior. * save_specials left ipsw value in r8 for us to test. */ extrd,u,*<> %r8,PSW_W_BIT,1,%r0 depdi 0,1,2,%r17 /* adjust isr/ior: get high bits from isr and deposit in ior */ space_adjust %r16,%r17,%r1 #endif STREG %r16, PT_ISR(%r29) STREG %r17, PT_IOR(%r29) #if 0 && defined(CONFIG_64BIT) /* Revisit when we have 64-bit code above 4Gb */ b,n intr_save2 skip_save_ior: /* We have a itlb miss, and when executing code above 4 Gb on ILP64, we * need to adjust iasq/iaoq here in the same way we adjusted isr/ior * above. */ extrd,u,* %r8,PSW_W_BIT,1,%r1 cmpib,COND(=),n 1,%r1,intr_save2 LDREG PT_IASQ0(%r29), %r16 LDREG PT_IAOQ0(%r29), %r17 /* adjust iasq/iaoq */ space_adjust %r16,%r17,%r1 STREG %r16, PT_IASQ0(%r29) STREG %r17, PT_IAOQ0(%r29) #else skip_save_ior: #endif intr_save2: virt_map save_general %r29 ldo PT_FR0(%r29), %r25 save_fp %r25 loadgp copy %r29, %r25 /* arg1 is pt_regs */ #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ #endif ldil L%intr_check_sig, %r2 copy %r25, %r16 /* save pt_regs */ b handle_interruption ldo R%intr_check_sig(%r2), %r2 ENDPROC_CFI(intr_save) /* * Note for all tlb miss handlers: * * cr24 contains a pointer to the kernel address space * page directory. * * cr25 contains a pointer to the current user address * space page directory. * * sr3 will contain the space id of the user address space * of the current running thread while that thread is * running in the kernel. */ /* * register number allocations. Note that these are all * in the shadowed registers */ t0 = r1 /* temporary register 0 */ va = r8 /* virtual address for which the trap occurred */ t1 = r9 /* temporary register 1 */ pte = r16 /* pte/phys page # */ prot = r17 /* prot bits */ spc = r24 /* space for which the trap occurred */ ptp = r25 /* page directory/page table pointer */ #ifdef CONFIG_64BIT dtlb_miss_20w: space_adjust spc,va,t0 get_pgd spc,ptp space_check spc,t0,dtlb_fault L3_ptep ptp,pte,t0,va,dtlb_check_alias_20w ptl_lock spc,ptp,pte,t0,t1,dtlb_check_alias_20w update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 idtlbt pte,prot ptl_unlock1 spc,t0 rfir nop dtlb_check_alias_20w: do_alias spc,t0,t1,va,pte,prot,dtlb_fault,20 idtlbt pte,prot rfir nop nadtlb_miss_20w: space_adjust spc,va,t0 get_pgd spc,ptp space_check spc,t0,nadtlb_fault L3_ptep ptp,pte,t0,va,nadtlb_check_alias_20w ptl_lock spc,ptp,pte,t0,t1,nadtlb_check_alias_20w update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 idtlbt pte,prot ptl_unlock1 spc,t0 rfir nop nadtlb_check_alias_20w: do_alias spc,t0,t1,va,pte,prot,nadtlb_emulate,20 idtlbt pte,prot rfir nop #else dtlb_miss_11: get_pgd spc,ptp space_check spc,t0,dtlb_fault L2_ptep ptp,pte,t0,va,dtlb_check_alias_11 ptl_lock spc,ptp,pte,t0,t1,dtlb_check_alias_11 update_accessed ptp,pte,t0,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 idtlba pte,(%sr1,va) idtlbp prot,(%sr1,va) mtsp t1, %sr1 /* Restore sr1 */ ptl_unlock1 spc,t0 rfir nop dtlb_check_alias_11: do_alias spc,t0,t1,va,pte,prot,dtlb_fault,11 idtlba pte,(va) idtlbp prot,(va) rfir nop nadtlb_miss_11: get_pgd spc,ptp space_check spc,t0,nadtlb_fault L2_ptep ptp,pte,t0,va,nadtlb_check_alias_11 ptl_lock spc,ptp,pte,t0,t1,nadtlb_check_alias_11 update_accessed ptp,pte,t0,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 idtlba pte,(%sr1,va) idtlbp prot,(%sr1,va) mtsp t1, %sr1 /* Restore sr1 */ ptl_unlock1 spc,t0 rfir nop nadtlb_check_alias_11: do_alias spc,t0,t1,va,pte,prot,nadtlb_emulate,11 idtlba pte,(va) idtlbp prot,(va) rfir nop dtlb_miss_20: space_adjust spc,va,t0 get_pgd spc,ptp space_check spc,t0,dtlb_fault L2_ptep ptp,pte,t0,va,dtlb_check_alias_20 ptl_lock spc,ptp,pte,t0,t1,dtlb_check_alias_20 update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 f_extend pte,t1 idtlbt pte,prot ptl_unlock1 spc,t0 rfir nop dtlb_check_alias_20: do_alias spc,t0,t1,va,pte,prot,dtlb_fault,20 idtlbt pte,prot rfir nop nadtlb_miss_20: get_pgd spc,ptp space_check spc,t0,nadtlb_fault L2_ptep ptp,pte,t0,va,nadtlb_check_alias_20 ptl_lock spc,ptp,pte,t0,t1,nadtlb_check_alias_20 update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 f_extend pte,t1 idtlbt pte,prot ptl_unlock1 spc,t0 rfir nop nadtlb_check_alias_20: do_alias spc,t0,t1,va,pte,prot,nadtlb_emulate,20 idtlbt pte,prot rfir nop #endif nadtlb_emulate: /* * Non access misses can be caused by fdc,fic,pdc,lpa,probe and * probei instructions. We don't want to fault for these * instructions (not only does it not make sense, it can cause * deadlocks, since some flushes are done with the mmap * semaphore held). If the translation doesn't exist, we can't * insert a translation, so have to emulate the side effects * of the instruction. Since we don't insert a translation * we can get a lot of faults during a flush loop, so it makes * sense to try to do it here with minimum overhead. We only * emulate fdc,fic,pdc,probew,prober instructions whose base * and index registers are not shadowed. We defer everything * else to the "slow" path. */ mfctl %cr19,%r9 /* Get iir */ /* PA 2.0 Arch Ref. Book pg 382 has a good description of the insn bits. Checks for fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw */ /* Checks for fdc,fdce,pdc,"fic,4f" only */ ldi 0x280,%r16 and %r9,%r16,%r17 cmpb,<>,n %r16,%r17,nadtlb_probe_check bb,>=,n %r9,26,nadtlb_nullify /* m bit not set, just nullify */ BL get_register,%r25 extrw,u %r9,15,5,%r8 /* Get index register # */ cmpib,COND(=),n -1,%r1,nadtlb_fault /* have to use slow path */ copy %r1,%r24 BL get_register,%r25 extrw,u %r9,10,5,%r8 /* Get base register # */ cmpib,COND(=),n -1,%r1,nadtlb_fault /* have to use slow path */ BL set_register,%r25 add,l %r1,%r24,%r1 /* doesn't affect c/b bits */ nadtlb_nullify: mfctl %ipsw,%r8 ldil L%PSW_N,%r9 or %r8,%r9,%r8 /* Set PSW_N */ mtctl %r8,%ipsw rfir nop /* When there is no translation for the probe address then we must nullify the insn and return zero in the target register. This will indicate to the calling code that it does not have write/read privileges to this address. This should technically work for prober and probew in PA 1.1, and also probe,r and probe,w in PA 2.0 WARNING: USE ONLY NON-SHADOW REGISTERS WITH PROBE INSN! THE SLOW-PATH EMULATION HAS NOT BEEN WRITTEN YET. */ nadtlb_probe_check: ldi 0x80,%r16 and %r9,%r16,%r17 cmpb,<>,n %r16,%r17,nadtlb_fault /* Must be probe,[rw]*/ BL get_register,%r25 /* Find the target register */ extrw,u %r9,31,5,%r8 /* Get target register */ cmpib,COND(=),n -1,%r1,nadtlb_fault /* have to use slow path */ BL set_register,%r25 copy %r0,%r1 /* Write zero to target register */ b nadtlb_nullify /* Nullify return insn */ nop #ifdef CONFIG_64BIT itlb_miss_20w: /* * I miss is a little different, since we allow users to fault * on the gateway page which is in the kernel address space. */ space_adjust spc,va,t0 get_pgd spc,ptp space_check spc,t0,itlb_fault L3_ptep ptp,pte,t0,va,itlb_fault ptl_lock spc,ptp,pte,t0,t1,itlb_fault update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 iitlbt pte,prot ptl_unlock1 spc,t0 rfir nop naitlb_miss_20w: /* * I miss is a little different, since we allow users to fault * on the gateway page which is in the kernel address space. */ space_adjust spc,va,t0 get_pgd spc,ptp space_check spc,t0,naitlb_fault L3_ptep ptp,pte,t0,va,naitlb_check_alias_20w ptl_lock spc,ptp,pte,t0,t1,naitlb_check_alias_20w update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 iitlbt pte,prot ptl_unlock1 spc,t0 rfir nop naitlb_check_alias_20w: do_alias spc,t0,t1,va,pte,prot,naitlb_fault,20 iitlbt pte,prot rfir nop #else itlb_miss_11: get_pgd spc,ptp space_check spc,t0,itlb_fault L2_ptep ptp,pte,t0,va,itlb_fault ptl_lock spc,ptp,pte,t0,t1,itlb_fault update_accessed ptp,pte,t0,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 iitlba pte,(%sr1,va) iitlbp prot,(%sr1,va) mtsp t1, %sr1 /* Restore sr1 */ ptl_unlock1 spc,t0 rfir nop naitlb_miss_11: get_pgd spc,ptp space_check spc,t0,naitlb_fault L2_ptep ptp,pte,t0,va,naitlb_check_alias_11 ptl_lock spc,ptp,pte,t0,t1,naitlb_check_alias_11 update_accessed ptp,pte,t0,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 iitlba pte,(%sr1,va) iitlbp prot,(%sr1,va) mtsp t1, %sr1 /* Restore sr1 */ ptl_unlock1 spc,t0 rfir nop naitlb_check_alias_11: do_alias spc,t0,t1,va,pte,prot,itlb_fault,11 iitlba pte,(%sr0, va) iitlbp prot,(%sr0, va) rfir nop itlb_miss_20: get_pgd spc,ptp space_check spc,t0,itlb_fault L2_ptep ptp,pte,t0,va,itlb_fault ptl_lock spc,ptp,pte,t0,t1,itlb_fault update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 f_extend pte,t1 iitlbt pte,prot ptl_unlock1 spc,t0 rfir nop naitlb_miss_20: get_pgd spc,ptp space_check spc,t0,naitlb_fault L2_ptep ptp,pte,t0,va,naitlb_check_alias_20 ptl_lock spc,ptp,pte,t0,t1,naitlb_check_alias_20 update_accessed ptp,pte,t0,t1 make_insert_tlb spc,pte,prot,t1 f_extend pte,t1 iitlbt pte,prot ptl_unlock1 spc,t0 rfir nop naitlb_check_alias_20: do_alias spc,t0,t1,va,pte,prot,naitlb_fault,20 iitlbt pte,prot rfir nop #endif #ifdef CONFIG_64BIT dbit_trap_20w: space_adjust spc,va,t0 get_pgd spc,ptp space_check spc,t0,dbit_fault L3_ptep ptp,pte,t0,va,dbit_fault ptl_lock spc,ptp,pte,t0,t1,dbit_fault update_dirty ptp,pte,t1 make_insert_tlb spc,pte,prot,t1 idtlbt pte,prot ptl_unlock0 spc,t0 rfir nop #else dbit_trap_11: get_pgd spc,ptp space_check spc,t0,dbit_fault L2_ptep ptp,pte,t0,va,dbit_fault ptl_lock spc,ptp,pte,t0,t1,dbit_fault update_dirty ptp,pte,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t1 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 idtlba pte,(%sr1,va) idtlbp prot,(%sr1,va) mtsp t1, %sr1 /* Restore sr1 */ ptl_unlock0 spc,t0 rfir nop dbit_trap_20: get_pgd spc,ptp space_check spc,t0,dbit_fault L2_ptep ptp,pte,t0,va,dbit_fault ptl_lock spc,ptp,pte,t0,t1,dbit_fault update_dirty ptp,pte,t1 make_insert_tlb spc,pte,prot,t1 f_extend pte,t1 idtlbt pte,prot ptl_unlock0 spc,t0 rfir nop #endif .import handle_interruption,code kernel_bad_space: b intr_save ldi 31,%r8 /* Use an unused code */ dbit_fault: b intr_save ldi 20,%r8 itlb_fault: b intr_save ldi PARISC_ITLB_TRAP,%r8 nadtlb_fault: b intr_save ldi 17,%r8 naitlb_fault: b intr_save ldi 16,%r8 dtlb_fault: b intr_save ldi 15,%r8 /* Register saving semantics for system calls: %r1 clobbered by system call macro in userspace %r2 saved in PT_REGS by gateway page %r3 - %r18 preserved by C code (saved by signal code) %r19 - %r20 saved in PT_REGS by gateway page %r21 - %r22 non-standard syscall args stored in kernel stack by gateway page %r23 - %r26 arg3-arg0, saved in PT_REGS by gateway page %r27 - %r30 saved in PT_REGS by gateway page %r31 syscall return pointer */ /* Floating point registers (FIXME: what do we do with these?) %fr0 - %fr3 status/exception, not preserved %fr4 - %fr7 arguments %fr8 - %fr11 not preserved by C code %fr12 - %fr21 preserved by C code %fr22 - %fr31 not preserved by C code */ .macro reg_save regs STREG %r3, PT_GR3(\regs) STREG %r4, PT_GR4(\regs) STREG %r5, PT_GR5(\regs) STREG %r6, PT_GR6(\regs) STREG %r7, PT_GR7(\regs) STREG %r8, PT_GR8(\regs) STREG %r9, PT_GR9(\regs) STREG %r10,PT_GR10(\regs) STREG %r11,PT_GR11(\regs) STREG %r12,PT_GR12(\regs) STREG %r13,PT_GR13(\regs) STREG %r14,PT_GR14(\regs) STREG %r15,PT_GR15(\regs) STREG %r16,PT_GR16(\regs) STREG %r17,PT_GR17(\regs) STREG %r18,PT_GR18(\regs) .endm .macro reg_restore regs LDREG PT_GR3(\regs), %r3 LDREG PT_GR4(\regs), %r4 LDREG PT_GR5(\regs), %r5 LDREG PT_GR6(\regs), %r6 LDREG PT_GR7(\regs), %r7 LDREG PT_GR8(\regs), %r8 LDREG PT_GR9(\regs), %r9 LDREG PT_GR10(\regs),%r10 LDREG PT_GR11(\regs),%r11 LDREG PT_GR12(\regs),%r12 LDREG PT_GR13(\regs),%r13 LDREG PT_GR14(\regs),%r14 LDREG PT_GR15(\regs),%r15 LDREG PT_GR16(\regs),%r16 LDREG PT_GR17(\regs),%r17 LDREG PT_GR18(\regs),%r18 .endm .macro fork_like name ENTRY_CFI(sys_\name\()_wrapper) mfctl %cr30,%r1 ldo TASK_REGS(%r1),%r1 reg_save %r1 mfctl %cr27, %r28 ldil L%sys_\name, %r31 be R%sys_\name(%sr4,%r31) STREG %r28, PT_CR27(%r1) ENDPROC_CFI(sys_\name\()_wrapper) .endm fork_like clone fork_like clone3 fork_like fork fork_like vfork /* Set the return value for the child */ ENTRY(child_return) BL schedule_tail, %r2 nop finish_child_return: mfctl %cr30,%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ LDREG PT_CR27(%r1), %r3 mtctl %r3, %cr27 reg_restore %r1 b syscall_exit copy %r0,%r28 END(child_return) ENTRY_CFI(sys_rt_sigreturn_wrapper) mfctl %cr30,%r26 ldo TASK_REGS(%r26),%r26 /* get pt regs */ /* Don't save regs, we are going to restore them from sigcontext. */ STREG %r2, -RP_OFFSET(%r30) #ifdef CONFIG_64BIT ldo FRAME_SIZE(%r30), %r30 BL sys_rt_sigreturn,%r2 ldo -16(%r30),%r29 /* Reference param save area */ #else BL sys_rt_sigreturn,%r2 ldo FRAME_SIZE(%r30), %r30 #endif ldo -FRAME_SIZE(%r30), %r30 LDREG -RP_OFFSET(%r30), %r2 /* FIXME: I think we need to restore a few more things here. */ mfctl %cr30,%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ reg_restore %r1 /* If the signal was received while the process was blocked on a * syscall, then r2 will take us to syscall_exit; otherwise r2 will * take us to syscall_exit_rfi and on to intr_return. */ bv %r0(%r2) LDREG PT_GR28(%r1),%r28 /* reload original r28 for syscall_exit */ ENDPROC_CFI(sys_rt_sigreturn_wrapper) ENTRY(syscall_exit) /* NOTE: Not all syscalls exit this way. rt_sigreturn will exit * via syscall_exit_rfi if the signal was received while the process * was running. */ /* save return value now */ mfctl %cr30, %r1 STREG %r28,TASK_PT_GR28(%r1) /* Seems to me that dp could be wrong here, if the syscall involved * calling a module, and nothing got round to restoring dp on return. */ loadgp syscall_check_resched: /* check for reschedule */ mfctl %cr30,%r19 LDREG TASK_TI_FLAGS(%r19),%r19 /* long */ bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */ .import do_signal,code syscall_check_sig: mfctl %cr30,%r19 LDREG TASK_TI_FLAGS(%r19),%r19 ldi (_TIF_USER_WORK_MASK & ~_TIF_NEED_RESCHED), %r26 and,COND(<>) %r19, %r26, %r0 b,n syscall_restore /* skip past if we've nothing to do */ syscall_do_signal: /* Save callee-save registers (for sigcontext). * FIXME: After this point the process structure should be * consistent with all the relevant state of the process * before the syscall. We need to verify this. */ mfctl %cr30,%r1 ldo TASK_REGS(%r1), %r26 /* struct pt_regs *regs */ reg_save %r26 #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ #endif BL do_notify_resume,%r2 ldi 1, %r25 /* long in_syscall = 1 */ mfctl %cr30,%r1 ldo TASK_REGS(%r1), %r20 /* reload pt_regs */ reg_restore %r20 b,n syscall_check_sig syscall_restore: mfctl %cr30,%r1 /* Are we being ptraced? */ LDREG TASK_TI_FLAGS(%r1),%r19 ldi _TIF_SYSCALL_TRACE_MASK,%r2 and,COND(=) %r19,%r2,%r0 b,n syscall_restore_rfi ldo TASK_PT_FR31(%r1),%r19 /* reload fpregs */ rest_fp %r19 LDREG TASK_PT_SAR(%r1),%r19 /* restore SAR */ mtsar %r19 LDREG TASK_PT_GR2(%r1),%r2 /* restore user rp */ LDREG TASK_PT_GR19(%r1),%r19 LDREG TASK_PT_GR20(%r1),%r20 LDREG TASK_PT_GR21(%r1),%r21 LDREG TASK_PT_GR22(%r1),%r22 LDREG TASK_PT_GR23(%r1),%r23 LDREG TASK_PT_GR24(%r1),%r24 LDREG TASK_PT_GR25(%r1),%r25 LDREG TASK_PT_GR26(%r1),%r26 LDREG TASK_PT_GR27(%r1),%r27 /* restore user dp */ LDREG TASK_PT_GR28(%r1),%r28 /* syscall return value */ LDREG TASK_PT_GR29(%r1),%r29 LDREG TASK_PT_GR31(%r1),%r31 /* restore syscall rp */ /* NOTE: We use rsm/ssm pair to make this operation atomic */ LDREG TASK_PT_GR30(%r1),%r1 /* Get user sp */ rsm PSW_SM_I, %r0 copy %r1,%r30 /* Restore user sp */ mfsp %sr3,%r1 /* Get user space id */ mtsp %r1,%sr7 /* Restore sr7 */ ssm PSW_SM_I, %r0 /* Set sr2 to zero for userspace syscalls to work. */ mtsp %r0,%sr2 mtsp %r1,%sr4 /* Restore sr4 */ mtsp %r1,%sr5 /* Restore sr5 */ mtsp %r1,%sr6 /* Restore sr6 */ depi PRIV_USER,31,2,%r31 /* ensure return to user mode. */ #ifdef CONFIG_64BIT /* decide whether to reset the wide mode bit * * For a syscall, the W bit is stored in the lowest bit * of sp. Extract it and reset W if it is zero */ extrd,u,*<> %r30,63,1,%r1 rsm PSW_SM_W, %r0 /* now reset the lowest bit of sp if it was set */ xor %r30,%r1,%r30 #endif be,n 0(%sr3,%r31) /* return to user space */ /* We have to return via an RFI, so that PSW T and R bits can be set * appropriately. * This sets up pt_regs so we can return via intr_restore, which is not * the most efficient way of doing things, but it works. */ syscall_restore_rfi: ldo -1(%r0),%r2 /* Set recovery cntr to -1 */ mtctl %r2,%cr0 /* for immediate trap */ LDREG TASK_PT_PSW(%r1),%r2 /* Get old PSW */ ldi 0x0b,%r20 /* Create new PSW */ depi -1,13,1,%r20 /* C, Q, D, and I bits */ /* The values of SINGLESTEP_BIT and BLOCKSTEP_BIT are * set in thread_info.h and converted to PA bitmap * numbers in asm-offsets.c */ /* if ((%r19.SINGLESTEP_BIT)) { %r20.27=1} */ extru,= %r19,TIF_SINGLESTEP_PA_BIT,1,%r0 depi -1,27,1,%r20 /* R bit */ /* if ((%r19.BLOCKSTEP_BIT)) { %r20.7=1} */ extru,= %r19,TIF_BLOCKSTEP_PA_BIT,1,%r0 depi -1,7,1,%r20 /* T bit */ STREG %r20,TASK_PT_PSW(%r1) /* Always store space registers, since sr3 can be changed (e.g. fork) */ mfsp %sr3,%r25 STREG %r25,TASK_PT_SR3(%r1) STREG %r25,TASK_PT_SR4(%r1) STREG %r25,TASK_PT_SR5(%r1) STREG %r25,TASK_PT_SR6(%r1) STREG %r25,TASK_PT_SR7(%r1) STREG %r25,TASK_PT_IASQ0(%r1) STREG %r25,TASK_PT_IASQ1(%r1) /* XXX W bit??? */ /* Now if old D bit is clear, it means we didn't save all registers * on syscall entry, so do that now. This only happens on TRACEME * calls, or if someone attached to us while we were on a syscall. * We could make this more efficient by not saving r3-r18, but * then we wouldn't be able to use the common intr_restore path. * It is only for traced processes anyway, so performance is not * an issue. */ bb,< %r2,30,pt_regs_ok /* Branch if D set */ ldo TASK_REGS(%r1),%r25 reg_save %r25 /* Save r3 to r18 */ /* Save the current sr */ mfsp %sr0,%r2 STREG %r2,TASK_PT_SR0(%r1) /* Save the scratch sr */ mfsp %sr1,%r2 STREG %r2,TASK_PT_SR1(%r1) /* sr2 should be set to zero for userspace syscalls */ STREG %r0,TASK_PT_SR2(%r1) LDREG TASK_PT_GR31(%r1),%r2 depi PRIV_USER,31,2,%r2 /* ensure return to user mode. */ STREG %r2,TASK_PT_IAOQ0(%r1) ldo 4(%r2),%r2 STREG %r2,TASK_PT_IAOQ1(%r1) b intr_restore copy %r25,%r16 pt_regs_ok: LDREG TASK_PT_IAOQ0(%r1),%r2 depi PRIV_USER,31,2,%r2 /* ensure return to user mode. */ STREG %r2,TASK_PT_IAOQ0(%r1) LDREG TASK_PT_IAOQ1(%r1),%r2 depi PRIV_USER,31,2,%r2 STREG %r2,TASK_PT_IAOQ1(%r1) b intr_restore copy %r25,%r16 syscall_do_resched: load32 syscall_check_resched,%r2 /* if resched, we start over again */ load32 schedule,%r19 bv %r0(%r19) /* jumps to schedule() */ #ifdef CONFIG_64BIT ldo -16(%r30),%r29 /* Reference param save area */ #else nop #endif END(syscall_exit) #ifdef CONFIG_FUNCTION_TRACER .import ftrace_function_trampoline,code .align L1_CACHE_BYTES ENTRY_CFI(mcount, caller) _mcount: .export _mcount,data /* * The 64bit mcount() function pointer needs 4 dwords, of which the * first two are free. We optimize it here and put 2 instructions for * calling mcount(), and 2 instructions for ftrace_stub(). That way we * have all on one L1 cacheline. */ ldi 0, %arg3 b ftrace_function_trampoline copy %r3, %arg2 /* caller original %sp */ ftrace_stub: .globl ftrace_stub .type ftrace_stub, @function #ifdef CONFIG_64BIT bve (%rp) #else bv %r0(%rp) #endif nop #ifdef CONFIG_64BIT .dword mcount .dword 0 /* code in head.S puts value of global gp here */ #endif ENDPROC_CFI(mcount) #ifdef CONFIG_DYNAMIC_FTRACE #ifdef CONFIG_64BIT #define FTRACE_FRAME_SIZE (2*FRAME_SIZE) #else #define FTRACE_FRAME_SIZE FRAME_SIZE #endif ENTRY_CFI(ftrace_caller, caller,frame=FTRACE_FRAME_SIZE,CALLS,SAVE_RP,SAVE_SP) ftrace_caller: .global ftrace_caller STREG %r3, -FTRACE_FRAME_SIZE+1*REG_SZ(%sp) ldo -FTRACE_FRAME_SIZE(%sp), %r3 STREG %rp, -RP_OFFSET(%r3) /* Offset 0 is already allocated for %r1 */ STREG %r23, 2*REG_SZ(%r3) STREG %r24, 3*REG_SZ(%r3) STREG %r25, 4*REG_SZ(%r3) STREG %r26, 5*REG_SZ(%r3) STREG %r28, 6*REG_SZ(%r3) STREG %r29, 7*REG_SZ(%r3) #ifdef CONFIG_64BIT STREG %r19, 8*REG_SZ(%r3) STREG %r20, 9*REG_SZ(%r3) STREG %r21, 10*REG_SZ(%r3) STREG %r22, 11*REG_SZ(%r3) STREG %r27, 12*REG_SZ(%r3) STREG %r31, 13*REG_SZ(%r3) loadgp ldo -16(%sp),%r29 #endif LDREG 0(%r3), %r25 copy %rp, %r26 ldo -8(%r25), %r25 ldi 0, %r23 /* no pt_regs */ b,l ftrace_function_trampoline, %rp copy %r3, %r24 LDREG -RP_OFFSET(%r3), %rp LDREG 2*REG_SZ(%r3), %r23 LDREG 3*REG_SZ(%r3), %r24 LDREG 4*REG_SZ(%r3), %r25 LDREG 5*REG_SZ(%r3), %r26 LDREG 6*REG_SZ(%r3), %r28 LDREG 7*REG_SZ(%r3), %r29 #ifdef CONFIG_64BIT LDREG 8*REG_SZ(%r3), %r19 LDREG 9*REG_SZ(%r3), %r20 LDREG 10*REG_SZ(%r3), %r21 LDREG 11*REG_SZ(%r3), %r22 LDREG 12*REG_SZ(%r3), %r27 LDREG 13*REG_SZ(%r3), %r31 #endif LDREG 1*REG_SZ(%r3), %r3 LDREGM -FTRACE_FRAME_SIZE(%sp), %r1 /* Adjust return point to jump back to beginning of traced function */ ldo -4(%r1), %r1 bv,n (%r1) ENDPROC_CFI(ftrace_caller) #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS ENTRY_CFI(ftrace_regs_caller,caller,frame=FTRACE_FRAME_SIZE+PT_SZ_ALGN, CALLS,SAVE_RP,SAVE_SP) ftrace_regs_caller: .global ftrace_regs_caller ldo -FTRACE_FRAME_SIZE(%sp), %r1 STREG %rp, -RP_OFFSET(%r1) copy %sp, %r1 ldo PT_SZ_ALGN(%sp), %sp STREG %rp, PT_GR2(%r1) STREG %r3, PT_GR3(%r1) STREG %r4, PT_GR4(%r1) STREG %r5, PT_GR5(%r1) STREG %r6, PT_GR6(%r1) STREG %r7, PT_GR7(%r1) STREG %r8, PT_GR8(%r1) STREG %r9, PT_GR9(%r1) STREG %r10, PT_GR10(%r1) STREG %r11, PT_GR11(%r1) STREG %r12, PT_GR12(%r1) STREG %r13, PT_GR13(%r1) STREG %r14, PT_GR14(%r1) STREG %r15, PT_GR15(%r1) STREG %r16, PT_GR16(%r1) STREG %r17, PT_GR17(%r1) STREG %r18, PT_GR18(%r1) STREG %r19, PT_GR19(%r1) STREG %r20, PT_GR20(%r1) STREG %r21, PT_GR21(%r1) STREG %r22, PT_GR22(%r1) STREG %r23, PT_GR23(%r1) STREG %r24, PT_GR24(%r1) STREG %r25, PT_GR25(%r1) STREG %r26, PT_GR26(%r1) STREG %r27, PT_GR27(%r1) STREG %r28, PT_GR28(%r1) STREG %r29, PT_GR29(%r1) STREG %r30, PT_GR30(%r1) STREG %r31, PT_GR31(%r1) mfctl %cr11, %r26 STREG %r26, PT_SAR(%r1) copy %rp, %r26 LDREG -FTRACE_FRAME_SIZE-PT_SZ_ALGN(%sp), %r25 ldo -8(%r25), %r25 ldo -FTRACE_FRAME_SIZE(%r1), %arg2 b,l ftrace_function_trampoline, %rp copy %r1, %arg3 /* struct pt_regs */ ldo -PT_SZ_ALGN(%sp), %r1 LDREG PT_SAR(%r1), %rp mtctl %rp, %cr11 LDREG PT_GR2(%r1), %rp LDREG PT_GR3(%r1), %r3 LDREG PT_GR4(%r1), %r4 LDREG PT_GR5(%r1), %r5 LDREG PT_GR6(%r1), %r6 LDREG PT_GR7(%r1), %r7 LDREG PT_GR8(%r1), %r8 LDREG PT_GR9(%r1), %r9 LDREG PT_GR10(%r1),%r10 LDREG PT_GR11(%r1),%r11 LDREG PT_GR12(%r1),%r12 LDREG PT_GR13(%r1),%r13 LDREG PT_GR14(%r1),%r14 LDREG PT_GR15(%r1),%r15 LDREG PT_GR16(%r1),%r16 LDREG PT_GR17(%r1),%r17 LDREG PT_GR18(%r1),%r18 LDREG PT_GR19(%r1),%r19 LDREG PT_GR20(%r1),%r20 LDREG PT_GR21(%r1),%r21 LDREG PT_GR22(%r1),%r22 LDREG PT_GR23(%r1),%r23 LDREG PT_GR24(%r1),%r24 LDREG PT_GR25(%r1),%r25 LDREG PT_GR26(%r1),%r26 LDREG PT_GR27(%r1),%r27 LDREG PT_GR28(%r1),%r28 LDREG PT_GR29(%r1),%r29 LDREG PT_GR30(%r1),%r30 LDREG PT_GR31(%r1),%r31 ldo -PT_SZ_ALGN(%sp), %sp LDREGM -FTRACE_FRAME_SIZE(%sp), %r1 /* Adjust return point to jump back to beginning of traced function */ ldo -4(%r1), %r1 bv,n (%r1) ENDPROC_CFI(ftrace_regs_caller) #endif #endif #ifdef CONFIG_FUNCTION_GRAPH_TRACER .align 8 ENTRY_CFI(return_to_handler, caller,frame=FRAME_SIZE) .export parisc_return_to_handler,data parisc_return_to_handler: copy %r3,%r1 STREG %r0,-RP_OFFSET(%sp) /* store 0 as %rp */ copy %sp,%r3 STREGM %r1,FRAME_SIZE(%sp) STREG %ret0,8(%r3) STREG %ret1,16(%r3) #ifdef CONFIG_64BIT loadgp #endif /* call ftrace_return_to_handler(0) */ .import ftrace_return_to_handler,code load32 ftrace_return_to_handler,%ret0 load32 .Lftrace_ret,%r2 #ifdef CONFIG_64BIT ldo -16(%sp),%ret1 /* Reference param save area */ bve (%ret0) #else bv %r0(%ret0) #endif ldi 0,%r26 .Lftrace_ret: copy %ret0,%rp /* restore original return values */ LDREG 8(%r3),%ret0 LDREG 16(%r3),%ret1 /* return from function */ #ifdef CONFIG_64BIT bve (%rp) #else bv %r0(%rp) #endif LDREGM -FRAME_SIZE(%sp),%r3 ENDPROC_CFI(return_to_handler) #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ #endif /* CONFIG_FUNCTION_TRACER */ #ifdef CONFIG_IRQSTACKS /* void call_on_stack(unsigned long param1, void *func, unsigned long new_stack) */ ENTRY_CFI(call_on_stack, FRAME=2*FRAME_SIZE,CALLS,SAVE_RP,SAVE_SP) ENTRY(_call_on_stack) copy %sp, %r1 /* Regarding the HPPA calling conventions for function pointers, we assume the PIC register is not changed across call. For CONFIG_64BIT, the argument pointer is left to point at the argument region allocated for the call to call_on_stack. */ /* Switch to new stack. We allocate two frames. */ ldo 2*FRAME_SIZE(%arg2), %sp # ifdef CONFIG_64BIT /* Save previous stack pointer and return pointer in frame marker */ STREG %rp, -FRAME_SIZE-RP_OFFSET(%sp) /* Calls always use function descriptor */ LDREG 16(%arg1), %arg1 bve,l (%arg1), %rp STREG %r1, -FRAME_SIZE-REG_SZ(%sp) LDREG -FRAME_SIZE-RP_OFFSET(%sp), %rp bve (%rp) LDREG -FRAME_SIZE-REG_SZ(%sp), %sp # else /* Save previous stack pointer and return pointer in frame marker */ STREG %r1, -FRAME_SIZE-REG_SZ(%sp) STREG %rp, -FRAME_SIZE-RP_OFFSET(%sp) /* Calls use function descriptor if PLABEL bit is set */ bb,>=,n %arg1, 30, 1f depwi 0,31,2, %arg1 LDREG 0(%arg1), %arg1 1: be,l 0(%sr4,%arg1), %sr0, %r31 copy %r31, %rp LDREG -FRAME_SIZE-RP_OFFSET(%sp), %rp bv (%rp) LDREG -FRAME_SIZE-REG_SZ(%sp), %sp # endif /* CONFIG_64BIT */ ENDPROC_CFI(call_on_stack) #endif /* CONFIG_IRQSTACKS */ ENTRY_CFI(get_register) /* * get_register is used by the non access tlb miss handlers to * copy the value of the general register specified in r8 into * r1. This routine can't be used for shadowed registers, since * the rfir will restore the original value. So, for the shadowed * registers we put a -1 into r1 to indicate that the register * should not be used (the register being copied could also have * a -1 in it, but that is OK, it just means that we will have * to use the slow path instead). */ blr %r8,%r0 nop bv %r0(%r25) /* r0 */ copy %r0,%r1 bv %r0(%r25) /* r1 - shadowed */ ldi -1,%r1 bv %r0(%r25) /* r2 */ copy %r2,%r1 bv %r0(%r25) /* r3 */ copy %r3,%r1 bv %r0(%r25) /* r4 */ copy %r4,%r1 bv %r0(%r25) /* r5 */ copy %r5,%r1 bv %r0(%r25) /* r6 */ copy %r6,%r1 bv %r0(%r25) /* r7 */ copy %r7,%r1 bv %r0(%r25) /* r8 - shadowed */ ldi -1,%r1 bv %r0(%r25) /* r9 - shadowed */ ldi -1,%r1 bv %r0(%r25) /* r10 */ copy %r10,%r1 bv %r0(%r25) /* r11 */ copy %r11,%r1 bv %r0(%r25) /* r12 */ copy %r12,%r1 bv %r0(%r25) /* r13 */ copy %r13,%r1 bv %r0(%r25) /* r14 */ copy %r14,%r1 bv %r0(%r25) /* r15 */ copy %r15,%r1 bv %r0(%r25) /* r16 - shadowed */ ldi -1,%r1 bv %r0(%r25) /* r17 - shadowed */ ldi -1,%r1 bv %r0(%r25) /* r18 */ copy %r18,%r1 bv %r0(%r25) /* r19 */ copy %r19,%r1 bv %r0(%r25) /* r20 */ copy %r20,%r1 bv %r0(%r25) /* r21 */ copy %r21,%r1 bv %r0(%r25) /* r22 */ copy %r22,%r1 bv %r0(%r25) /* r23 */ copy %r23,%r1 bv %r0(%r25) /* r24 - shadowed */ ldi -1,%r1 bv %r0(%r25) /* r25 - shadowed */ ldi -1,%r1 bv %r0(%r25) /* r26 */ copy %r26,%r1 bv %r0(%r25) /* r27 */ copy %r27,%r1 bv %r0(%r25) /* r28 */ copy %r28,%r1 bv %r0(%r25) /* r29 */ copy %r29,%r1 bv %r0(%r25) /* r30 */ copy %r30,%r1 bv %r0(%r25) /* r31 */ copy %r31,%r1 ENDPROC_CFI(get_register) ENTRY_CFI(set_register) /* * set_register is used by the non access tlb miss handlers to * copy the value of r1 into the general register specified in * r8. */ blr %r8,%r0 nop bv %r0(%r25) /* r0 (silly, but it is a place holder) */ copy %r1,%r0 bv %r0(%r25) /* r1 */ copy %r1,%r1 bv %r0(%r25) /* r2 */ copy %r1,%r2 bv %r0(%r25) /* r3 */ copy %r1,%r3 bv %r0(%r25) /* r4 */ copy %r1,%r4 bv %r0(%r25) /* r5 */ copy %r1,%r5 bv %r0(%r25) /* r6 */ copy %r1,%r6 bv %r0(%r25) /* r7 */ copy %r1,%r7 bv %r0(%r25) /* r8 */ copy %r1,%r8 bv %r0(%r25) /* r9 */ copy %r1,%r9 bv %r0(%r25) /* r10 */ copy %r1,%r10 bv %r0(%r25) /* r11 */ copy %r1,%r11 bv %r0(%r25) /* r12 */ copy %r1,%r12 bv %r0(%r25) /* r13 */ copy %r1,%r13 bv %r0(%r25) /* r14 */ copy %r1,%r14 bv %r0(%r25) /* r15 */ copy %r1,%r15 bv %r0(%r25) /* r16 */ copy %r1,%r16 bv %r0(%r25) /* r17 */ copy %r1,%r17 bv %r0(%r25) /* r18 */ copy %r1,%r18 bv %r0(%r25) /* r19 */ copy %r1,%r19 bv %r0(%r25) /* r20 */ copy %r1,%r20 bv %r0(%r25) /* r21 */ copy %r1,%r21 bv %r0(%r25) /* r22 */ copy %r1,%r22 bv %r0(%r25) /* r23 */ copy %r1,%r23 bv %r0(%r25) /* r24 */ copy %r1,%r24 bv %r0(%r25) /* r25 */ copy %r1,%r25 bv %r0(%r25) /* r26 */ copy %r1,%r26 bv %r0(%r25) /* r27 */ copy %r1,%r27 bv %r0(%r25) /* r28 */ copy %r1,%r28 bv %r0(%r25) /* r29 */ copy %r1,%r29 bv %r0(%r25) /* r30 */ copy %r1,%r30 bv %r0(%r25) /* r31 */ copy %r1,%r31 ENDPROC_CFI(set_register)