/* * 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) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/config.h> #include <asm/offsets.h> /* 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 <asm/assembly.h> /* for LDREG/STREG defines */ #include <asm/pgtable.h> #include <asm/psw.h> #include <asm/signal.h> #include <asm/unistd.h> #include <asm/thread_info.h> #ifdef __LP64__ #define CMPIB cmpib,* #define CMPB cmpb,* #define COND(x) *x .level 2.0w #else #define CMPIB cmpib, #define CMPB cmpb, #define COND(x) x .level 2.0 #endif .import pa_dbit_lock,data /* 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 /* Switch to virtual mapping, trashing only %r1 */ .macro virt_map rsm PSW_SM_Q,%r0 tovirt_r1 %r29 mfsp %sr7, %r1 or,= %r0,%r1,%r0 /* Only save sr7 in sr3 if sr7 != 0 */ mtsp %r1, %sr3 mtsp %r0, %sr4 mtsp %r0, %sr5 mtsp %r0, %sr6 mtsp %r0, %sr7 ldil L%KERNEL_PSW, %r1 ldo R%KERNEL_PSW(%r1), %r1 mtctl %r1, %cr22 mtctl %r0, %cr17 /* Clear IIASQ tail */ mtctl %r0, %cr17 /* Clear IIASQ head */ ldil L%4f, %r1 ldo R%4f(%r1), %r1 mtctl %r1, %cr18 /* Set IIAOQ tail */ ldo 4(%r1), %r1 mtctl %r1, %cr18 /* Set IIAOQ head */ rfir nop 4: .endm /* * The "get_stack" macros are responsible for determining the * kernel stack value. * * For Faults: * 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. Set the stack * pointer to point to the end of the task structure. * * For Interrupts: * If sr7 == 0 * Already using a kernel stack, check to see if r30 * is already pointing to the per processor interrupt * stack. If it is, call the get_stack_use_r30 macro * to push a pt_regs structure on the stack, and store * registers there. Otherwise, call get_stack_use_cr31 * to get a pointer to the base of the interrupt stack * and push a pt_regs structure on that stack. * 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. Set the stack * pointer to point to the end of the task structure. * N.B: We don't use the interrupt stack for the * first interrupt from userland, because signals/ * resched's are processed when returning to userland, * and we can sleep in those cases. * * 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. * * N.B. TASK_SZ_ALGN and PT_SZ_ALGN include space for a stack frame. */ .macro get_stack_use_cr30 /* we save the registers in the task struct */ mfctl %cr30, %r1 tophys %r1,%r9 LDREG TI_TASK(%r9), %r1 /* thread_info -> task_struct */ tophys %r1,%r9 ldo TASK_REGS(%r9),%r9 STREG %r30, PT_GR30(%r9) STREG %r29,PT_GR29(%r9) STREG %r26,PT_GR26(%r9) copy %r9,%r29 mfctl %cr30, %r1 ldo THREAD_SZ_ALGN(%r1), %r30 .endm .macro get_stack_use_r30 /* we put a struct pt_regs on the stack and save the registers there */ tophys %r30,%r9 STREG %r30,PT_GR30(%r9) ldo PT_SZ_ALGN(%r30),%r30 STREG %r29,PT_GR29(%r9) STREG %r26,PT_GR26(%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 */ ldil L%PA(os_hpmc), %r3 ldo R%PA(os_hpmc)(%r3), %r3 bv,n 0(%r3) nop .word 0 /* checksum (will be patched) */ .word PA(os_hpmc) /* 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 occured */ spc = r24 /* space for which the trap occured */ #ifndef __LP64__ /* * 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 __LP64__ b itlb_miss_20w #else b itlb_miss_20 #endif mfctl %pcoq, va .align 32 .endm #ifndef __LP64__ /* * naitlb miss interruption handler (parisc 1.1 - 32 bit) * * Note: naitlb misses will be treated * as an ordinary itlb miss for now. * However, note that naitlb misses * have the faulting address in the * IOR/ISR. */ .macro naitlb_11 code mfctl %isr,spc b itlb_miss_11 mfctl %ior,va /* FIXME: If user causes a naitlb miss, the priv level may not be in * lower bits of va, where the itlb miss handler is expecting them */ .align 32 .endm #endif /* * naitlb miss interruption handler (parisc 2.0) * * Note: naitlb misses will be treated * as an ordinary itlb miss for now. * However, note that naitlb misses * have the faulting address in the * IOR/ISR. */ .macro naitlb_20 code mfctl %isr,spc #ifdef __LP64__ b itlb_miss_20w #else b itlb_miss_20 #endif mfctl %ior,va /* FIXME: If user causes a naitlb miss, the priv level may not be in * lower bits of va, where the itlb miss handler is expecting them */ .align 32 .endm #ifndef __LP64__ /* * 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 __LP64__ b dtlb_miss_20w #else b dtlb_miss_20 #endif mfctl %ior, va .align 32 .endm #ifndef __LP64__ /* 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 __LP64__ b nadtlb_miss_20w #else b nadtlb_miss_20 #endif mfctl %ior,va .align 32 .endm #ifndef __LP64__ /* * 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 __LP64__ b dbit_trap_20w #else b dbit_trap_20 #endif mfctl %ior,va .align 32 .endm /* The following are simple 32 vs 64 bit instruction * abstractions for the macros */ .macro EXTR reg1,start,length,reg2 #ifdef __LP64__ extrd,u \reg1,32+\start,\length,\reg2 #else extrw,u \reg1,\start,\length,\reg2 #endif .endm .macro DEP reg1,start,length,reg2 #ifdef __LP64__ depd \reg1,32+\start,\length,\reg2 #else depw \reg1,\start,\length,\reg2 #endif .endm .macro DEPI val,start,length,reg #ifdef __LP64__ depdi \val,32+\start,\length,\reg #else depwi \val,\start,\length,\reg #endif .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 __LP64__ 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 /* 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 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 because our pte * and pmd are allocated <4GB */ .macro L2_ptep pmd,pte,index,va,fault #if PT_NLEVELS == 3 EXTR \va,31-ASM_PMD_SHIFT,ASM_BITS_PER_PMD,\index #else EXTR \va,31-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index #endif DEP %r0,31,PAGE_SHIFT,\pmd /* clear offset */ copy %r0,\pte ldw,s \index(\pmd),\pmd EXTR \va,31-PAGE_SHIFT,ASM_BITS_PER_PTE,\index bb,>=,n \pmd,_PAGE_PRESENT_BIT,\fault DEP %r0,31,PAGE_SHIFT,\pmd /* clear offset */ shladd \index,BITS_PER_PTE_ENTRY,\pmd,\pmd LDREG %r0(\pmd),\pte /* pmd is now pte */ bb,>=,n \pte,_PAGE_PRESENT_BIT,\fault .endm /* Look up PTE in a 3-Level scheme. * * Here we implement a Hybrid L2/L3 scheme: we allocate the * first pmd adjacent to the pgd. This means that we can * subtract a constant offset to get to it. The pmd and pgd * sizes are arranged so that a single pmd covers 4GB (giving * a full LP64 process access to 8TB) so our lookups are * effectively L2 for the first 4GB of the kernel (i.e. for * all ILP32 processes and all the kernel for machines with * under 4GB of memory) */ .macro L3_ptep pgd,pte,index,va,fault extrd,u \va,63-ASM_PGDIR_SHIFT,ASM_BITS_PER_PGD,\index copy %r0,\pte extrd,u,*= \va,31,32,%r0 ldw,s \index(\pgd),\pgd extrd,u,*<> \va,31,32,%r0 ldo ASM_PGD_PMD_OFFSET(\pgd),\pgd extrd,u,*= \va,31,32,%r0 bb,>=,n \pgd,_PAGE_PRESENT_BIT,\fault L2_ptep \pgd,\pte,\index,\va,\fault .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_ptep ptep,pte,tmp,tmp1 ldi _PAGE_ACCESSED,\tmp1 or \tmp1,\pte,\tmp and,COND(<>) \tmp1,\pte,%r0 STREG \tmp,0(\ptep) .endm /* Set the dirty bit (and accessed bit). No need to be * clever, this is only used from the dirty fault */ .macro update_dirty ptep,pte,tmp,tmp1 ldi _PAGE_ACCESSED|_PAGE_DIRTY,\tmp or \tmp,\pte,\pte STREG \pte,0(\ptep) .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 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 _PAGE_READ * 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 */ /* Get rid of prot bits and convert to page addr for iitlbt */ depd %r0,63,PAGE_SHIFT,\pte extrd,u \pte,56,32,\pte .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 0,31,12,\pte extru \pte,24,25,\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 cmpib,COND(<>),n 0,\spc,\fault ldil L%(TMPALIAS_MAP_START),\tmp #if defined(__LP64__) && (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 ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),\prot depd,z \prot,8,7,\prot /* * OK, it is in the temp alias region, check whether "from" or "to". * Check "subtle" note in pacache.S re: r23/r26. */ #ifdef __LP64__ 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 /* * Align fault_vector_20 on 4K boundary so that both * fault_vector_11 and fault_vector_20 are on the * same page. This is only necessary as long as we * write protect the kernel text, which we may stop * doing once we use large page translations to cover * the static part of the kernel address space. */ .export fault_vector_20 .text .align 4096 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 6 def 7 def 8 def 9 def 10 def 11 def 12 def 13 def 14 dtlb_20 15 #if 0 naitlb_20 16 #else def 16 #endif 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 #ifndef __LP64__ .export fault_vector_11 .align 2048 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 6 def 7 def 8 def 9 def 10 def 11 def 12 def 13 def 14 dtlb_11 15 #if 0 naitlb_11 16 #else def 16 #endif 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 #endif .import handle_interruption,code .import do_cpu_irq_mask,code /* * r26 = function to be called * r25 = argument to pass in * r24 = flags for do_fork() * * Kernel threads don't ever return, so they don't need * a true register context. We just save away the arguments * for copy_thread/ret_ to properly set up the child. */ #define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */ #define CLONE_UNTRACED 0x00800000 .export __kernel_thread, code .import do_fork __kernel_thread: STREG %r2, -RP_OFFSET(%r30) copy %r30, %r1 ldo PT_SZ_ALGN(%r30),%r30 #ifdef __LP64__ /* Yo, function pointers in wide mode are little structs... -PB */ ldd 24(%r26), %r2 STREG %r2, PT_GR27(%r1) /* Store childs %dp */ ldd 16(%r26), %r26 STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */ copy %r0, %r22 /* user_tid */ #endif STREG %r26, PT_GR26(%r1) /* Store function & argument for child */ STREG %r25, PT_GR25(%r1) ldil L%CLONE_UNTRACED, %r26 ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */ or %r26, %r24, %r26 /* will have kernel mappings. */ ldi 1, %r25 /* stack_start, signals kernel thread */ stw %r0, -52(%r30) /* user_tid */ #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif bl do_fork, %r2 copy %r1, %r24 /* pt_regs */ /* Parent Returns here */ LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2 ldo -PT_SZ_ALGN(%r30), %r30 bv %r0(%r2) nop /* * Child Returns here * * copy_thread moved args from temp save area set up above * into task save area. */ .export ret_from_kernel_thread ret_from_kernel_thread: /* Call schedule_tail first though */ bl schedule_tail, %r2 nop LDREG TI_TASK-THREAD_SZ_ALGN(%r30), %r1 LDREG TASK_PT_GR25(%r1), %r26 #ifdef __LP64__ LDREG TASK_PT_GR27(%r1), %r27 LDREG TASK_PT_GR22(%r1), %r22 #endif LDREG TASK_PT_GR26(%r1), %r1 ble 0(%sr7, %r1) copy %r31, %r2 #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ loadgp /* Thread could have been in a module */ #endif b sys_exit ldi 0, %r26 .import sys_execve, code .export __execve, code __execve: copy %r2, %r15 copy %r30, %r16 ldo PT_SZ_ALGN(%r30), %r30 STREG %r26, PT_GR26(%r16) STREG %r25, PT_GR25(%r16) STREG %r24, PT_GR24(%r16) #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif bl sys_execve, %r2 copy %r16, %r26 cmpib,=,n 0,%r28,intr_return /* forward */ /* yes, this will trap and die. */ copy %r15, %r2 copy %r16, %r30 bv %r0(%r2) nop .align 4 /* * struct task_struct *_switch_to(struct task_struct *prev, * struct task_struct *next) * * switch kernel stacks and return prev */ .export _switch_to, code _switch_to: STREG %r2, -RP_OFFSET(%r30) callee_save ldil L%_switch_to_ret, %r2 ldo R%_switch_to_ret(%r2), %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 LDREG TASK_THREAD_INFO(%r25), %r25 bv %r0(%r2) mtctl %r25,%cr30 _switch_to_ret: mtctl %r0, %cr0 /* Needed for single stepping */ callee_rest LDREG -RP_OFFSET(%r30), %r2 bv %r0(%r2) copy %r26, %r28 /* * 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]. * * Note that the following code uses a "relied upon translation". * See the parisc ACD for details. The ssm is necessary due to a * PCXT bug. */ .align 4096 .export syscall_exit_rfi syscall_exit_rfi: mfctl %cr30,%r16 LDREG TI_TASK(%r16), %r16 /* thread_info -> 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 3,31,2,%r19 STREG %r19,PT_IAOQ0(%r16) LDREG PT_IAOQ1(%r16),%r19 depi 3,31,2,%r19 STREG %r19,PT_IAOQ1(%r16) LDREG PT_PSW(%r16),%r19 ldil L%USER_PSW_MASK,%r1 ldo R%USER_PSW_MASK(%r1),%r1 #ifdef __LP64__ ldil L%USER_PSW_HI_MASK,%r20 ldo R%USER_PSW_HI_MASK(%r20),%r20 depd %r20,31,32,%r1 #endif and %r19,%r1,%r19 /* Mask out bits that user shouldn't play with */ ldil L%USER_PSW,%r1 ldo R%USER_PSW(%r1),%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 occured while on the gateway * page) Note that we may be "trashing" values the user put in * them, but we don't support the 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) intr_return: ssm PSW_SM_I, %r0 /* Check for software interrupts */ .import irq_stat,data ldil L%irq_stat,%r19 ldo R%irq_stat(%r19),%r19 #ifdef CONFIG_SMP mfctl %cr30,%r1 ldw TI_CPU(%r1),%r1 /* get cpu # - int */ /* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) amount ** irq_stat[] is defined using ____cacheline_aligned. */ #ifdef __LP64__ shld %r1, 6, %r20 #else shlw %r1, 5, %r20 #endif add %r19,%r20,%r19 /* now have &irq_stat[smp_processor_id()] */ #endif /* CONFIG_SMP */ LDREG IRQSTAT_SIRQ_PEND(%r19),%r20 /* hardirq.h: unsigned long */ cmpib,<>,n 0,%r20,intr_do_softirq /* forward */ intr_check_resched: /* check for reschedule */ mfctl %cr30,%r1 LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_NEED_RESCHED */ bb,<,n %r19,31-TIF_NEED_RESCHED,intr_do_resched /* forward */ intr_check_sig: /* As above */ mfctl %cr30,%r1 LDREG TI_FLAGS(%r1),%r19 /* sched.h: TIF_SIGPENDING */ bb,<,n %r19, 31-TIF_SIGPENDING, intr_do_signal /* forward */ intr_restore: copy %r16,%r29 ldo PT_FR31(%r29),%r1 rest_fp %r1 rest_general %r29 ssm 0,%r0 nop nop nop nop nop nop nop tophys_r1 %r29 rsm (PSW_SM_Q|PSW_SM_P|PSW_SM_D|PSW_SM_I),%r0 rest_specials %r29 rest_stack rfi nop nop nop nop nop nop nop nop .import do_softirq,code intr_do_softirq: bl do_softirq,%r2 #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #else nop #endif b intr_check_resched nop .import schedule,code intr_do_resched: /* Only do reschedule if we are returning to user space */ LDREG PT_IASQ0(%r16), %r20 CMPIB= 0,%r20,intr_restore /* backward */ nop LDREG PT_IASQ1(%r16), %r20 CMPIB= 0,%r20,intr_restore /* backward */ nop #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif ldil L%intr_check_sig, %r2 b schedule ldo R%intr_check_sig(%r2), %r2 .import do_signal,code intr_do_signal: /* Only do signals if we are returning to user space */ LDREG PT_IASQ0(%r16), %r20 CMPIB= 0,%r20,intr_restore /* backward */ nop LDREG PT_IASQ1(%r16), %r20 CMPIB= 0,%r20,intr_restore /* backward */ nop copy %r0, %r24 /* unsigned long in_syscall */ copy %r16, %r25 /* struct pt_regs *regs */ #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif bl do_signal,%r2 copy %r0, %r26 /* sigset_t *oldset = NULL */ b intr_restore nop /* * External interrupts. */ intr_extint: CMPIB=,n 0,%r16,1f get_stack_use_cr30 b,n 3f 1: #if 0 /* Interrupt Stack support not working yet! */ mfctl %cr31,%r1 copy %r30,%r17 /* FIXME! depi below has hardcoded idea of interrupt stack size (32k)*/ #ifdef __LP64__ depdi 0,63,15,%r17 #else depi 0,31,15,%r17 #endif CMPB=,n %r1,%r17,2f get_stack_use_cr31 b,n 3f #endif 2: get_stack_use_r30 3: 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 __LP64__ 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 */ /* Generic interruptions (illegal insn, unaligned, page fault, etc) */ .export intr_save, code /* for os_hpmc */ intr_save: mfsp %sr7,%r16 CMPIB=,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 */ /* * FIXME: 1) Use a #define for the hardwired "6" below (and in * traps.c. * 2) Once we start executing code above 4 Gb, we need * to adjust iasq/iaoq here in the same way we * adjust isr/ior below. */ CMPIB=,n 6,%r26,skip_save_ior /* save_specials left ipsw value in r8 for us to test */ mfctl %cr20, %r16 /* isr */ mfctl %cr21, %r17 /* ior */ #ifdef __LP64__ /* * If the interrupted code was running with W bit off (32 bit), * clear the b bits (bits 0 & 1) in the ior. */ extrd,u,*<> %r8,PSW_W_BIT,1,%r0 depdi 0,1,2,%r17 /* * FIXME: This code has hardwired assumptions about the split * between space bits and offset bits. This will change * when we allow alternate page sizes. */ /* adjust isr/ior. */ extrd,u %r16,63,7,%r1 /* get high bits from isr for ior */ depd %r1,31,7,%r17 /* deposit them into ior */ depdi 0,63,7,%r16 /* clear them from isr */ #endif STREG %r16, PT_ISR(%r29) STREG %r17, PT_IOR(%r29) skip_save_ior: virt_map save_general %r29 ldo PT_FR0(%r29), %r25 save_fp %r25 loadgp copy %r29, %r25 /* arg1 is pt_regs */ #ifdef __LP64__ 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 /* * 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 occured */ t1 = r9 /* temporary register 1 */ pte = r16 /* pte/phys page # */ prot = r17 /* prot bits */ spc = r24 /* space for which the trap occured */ ptp = r25 /* page directory/page table pointer */ #ifdef __LP64__ 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 update_ptep ptp,pte,t0,t1 make_insert_tlb spc,pte,prot idtlbt pte,prot rfir nop dtlb_check_alias_20w: do_alias spc,t0,t1,va,pte,prot,dtlb_fault 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_flush_20w update_ptep ptp,pte,t0,t1 make_insert_tlb spc,pte,prot idtlbt pte,prot rfir nop nadtlb_check_flush_20w: bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate /* Insert a "flush only" translation */ depdi,z 7,7,3,prot depdi 1,10,1,prot /* Get rid of prot bits and convert to page addr for idtlbt */ depdi 0,63,12,pte extrd,u pte,56,52,pte 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 update_ptep ptp,pte,t0,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 idtlba pte,(%sr1,va) idtlbp prot,(%sr1,va) mtsp t0, %sr1 /* Restore sr1 */ rfir nop dtlb_check_alias_11: /* Check to see if fault is in the temporary alias region */ cmpib,<>,n 0,spc,dtlb_fault /* forward */ ldil L%(TMPALIAS_MAP_START),t0 copy va,t1 depwi 0,31,23,t1 cmpb,<>,n t0,t1,dtlb_fault /* forward */ ldi (_PAGE_DIRTY|_PAGE_WRITE|_PAGE_READ),prot depw,z prot,8,7,prot /* * OK, it is in the temp alias region, check whether "from" or "to". * Check "subtle" note in pacache.S re: r23/r26. */ extrw,u,= va,9,1,r0 or,tr %r23,%r0,pte /* If "from" use "from" page */ or %r26,%r0,pte /* else "to", use "to" page */ 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_flush_11 update_ptep ptp,pte,t0,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 idtlba pte,(%sr1,va) idtlbp prot,(%sr1,va) mtsp t0, %sr1 /* Restore sr1 */ rfir nop nadtlb_check_flush_11: bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate /* Insert a "flush only" translation */ zdepi 7,7,3,prot depi 1,10,1,prot /* Get rid of prot bits and convert to page addr for idtlba */ depi 0,31,12,pte extru pte,24,25,pte mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 idtlba pte,(%sr1,va) idtlbp prot,(%sr1,va) mtsp t0, %sr1 /* Restore sr1 */ 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 update_ptep ptp,pte,t0,t1 make_insert_tlb spc,pte,prot f_extend pte,t0 idtlbt pte,prot rfir nop dtlb_check_alias_20: do_alias spc,t0,t1,va,pte,prot,dtlb_fault 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_flush_20 update_ptep ptp,pte,t0,t1 make_insert_tlb spc,pte,prot f_extend pte,t0 idtlbt pte,prot rfir nop nadtlb_check_flush_20: bb,>=,n pte,_PAGE_FLUSH_BIT,nadtlb_emulate /* Insert a "flush only" translation */ depdi,z 7,7,3,prot depdi 1,10,1,prot /* Get rid of prot bits and convert to page addr for idtlbt */ depdi 0,63,12,pte extrd,u pte,56,32,pte 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 instructions whose base and index * registers are not shadowed. We defer everything else to the * "slow" path. */ mfctl %cr19,%r9 /* Get iir */ ldi 0x280,%r16 and %r9,%r16,%r17 cmpb,<>,n %r16,%r17,nadtlb_fault /* Not fdc,fic,pdc */ bb,>=,n %r9,26,nadtlb_nullify /* m bit not set, just nullify */ b,l get_register,%r25 extrw,u %r9,15,5,%r8 /* Get index register # */ CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */ copy %r1,%r24 b,l get_register,%r25 extrw,u %r9,10,5,%r8 /* Get base register # */ CMPIB=,n -1,%r1,nadtlb_fault /* have to use slow path */ b,l set_register,%r25 add,l %r1,%r24,%r1 /* doesn't affect c/b bits */ nadtlb_nullify: mfctl %cr22,%r8 /* Get ipsw */ ldil L%PSW_N,%r9 or %r8,%r9,%r8 /* Set PSW_N */ mtctl %r8,%cr22 rfir nop #ifdef __LP64__ 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 update_ptep ptp,pte,t0,t1 make_insert_tlb spc,pte,prot 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 update_ptep ptp,pte,t0,t1 make_insert_tlb_11 spc,pte,prot mfsp %sr1,t0 /* Save sr1 so we can use it in tlb inserts */ mtsp spc,%sr1 iitlba pte,(%sr1,va) iitlbp prot,(%sr1,va) mtsp t0, %sr1 /* Restore sr1 */ rfir nop itlb_miss_20: get_pgd spc,ptp space_check spc,t0,itlb_fault L2_ptep ptp,pte,t0,va,itlb_fault update_ptep ptp,pte,t0,t1 make_insert_tlb spc,pte,prot f_extend pte,t0 iitlbt pte,prot rfir nop #endif #ifdef __LP64__ 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 #ifdef CONFIG_SMP CMPIB=,n 0,spc,dbit_nolock_20w ldil L%PA(pa_dbit_lock),t0 ldo R%PA(pa_dbit_lock)(t0),t0 dbit_spin_20w: ldcw 0(t0),t1 cmpib,= 0,t1,dbit_spin_20w nop dbit_nolock_20w: #endif update_dirty ptp,pte,t0,t1 make_insert_tlb spc,pte,prot idtlbt pte,prot #ifdef CONFIG_SMP CMPIB=,n 0,spc,dbit_nounlock_20w ldi 1,t1 stw t1,0(t0) dbit_nounlock_20w: #endif rfir nop #else dbit_trap_11: get_pgd spc,ptp space_check spc,t0,dbit_fault L2_ptep ptp,pte,t0,va,dbit_fault #ifdef CONFIG_SMP CMPIB=,n 0,spc,dbit_nolock_11 ldil L%PA(pa_dbit_lock),t0 ldo R%PA(pa_dbit_lock)(t0),t0 dbit_spin_11: ldcw 0(t0),t1 cmpib,= 0,t1,dbit_spin_11 nop dbit_nolock_11: #endif update_dirty 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 */ #ifdef CONFIG_SMP CMPIB=,n 0,spc,dbit_nounlock_11 ldi 1,t1 stw t1,0(t0) dbit_nounlock_11: #endif rfir nop dbit_trap_20: get_pgd spc,ptp space_check spc,t0,dbit_fault L2_ptep ptp,pte,t0,va,dbit_fault #ifdef CONFIG_SMP CMPIB=,n 0,spc,dbit_nolock_20 ldil L%PA(pa_dbit_lock),t0 ldo R%PA(pa_dbit_lock)(t0),t0 dbit_spin_20: ldcw 0(t0),t1 cmpib,= 0,t1,dbit_spin_20 nop dbit_nolock_20: #endif update_dirty ptp,pte,t0,t1 make_insert_tlb spc,pte,prot f_extend pte,t0 idtlbt pte,prot #ifdef CONFIG_SMP CMPIB=,n 0,spc,dbit_nounlock_20 ldi 1,t1 stw t1,0(t0) dbit_nounlock_20: #endif 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 6,%r8 nadtlb_fault: b intr_save ldi 17,%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 .export sys_fork_wrapper .export child_return sys_fork_wrapper: LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 ldo TASK_REGS(%r1),%r1 reg_save %r1 mfctl %cr27, %r3 STREG %r3, PT_CR27(%r1) STREG %r2,-RP_OFFSET(%r30) ldo FRAME_SIZE(%r30),%r30 #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif /* These are call-clobbered registers and therefore also syscall-clobbered (we hope). */ STREG %r2,PT_GR19(%r1) /* save for child */ STREG %r30,PT_GR21(%r1) LDREG PT_GR30(%r1),%r25 copy %r1,%r24 bl sys_clone,%r2 ldi SIGCHLD,%r26 LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 wrapper_exit: ldo -FRAME_SIZE(%r30),%r30 /* get the stackframe */ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ LDREG PT_CR27(%r1), %r3 mtctl %r3, %cr27 reg_restore %r1 /* strace expects syscall # to be preserved in r20 */ ldi __NR_fork,%r20 bv %r0(%r2) STREG %r20,PT_GR20(%r1) /* Set the return value for the child */ child_return: bl schedule_tail, %r2 nop LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE-FRAME_SIZE(%r30), %r1 LDREG TASK_PT_GR19(%r1),%r2 b wrapper_exit copy %r0,%r28 .export sys_clone_wrapper sys_clone_wrapper: LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ reg_save %r1 mfctl %cr27, %r3 STREG %r3, PT_CR27(%r1) STREG %r2,-RP_OFFSET(%r30) ldo FRAME_SIZE(%r30),%r30 #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif STREG %r2,PT_GR19(%r1) /* save for child */ STREG %r30,PT_GR21(%r1) bl sys_clone,%r2 copy %r1,%r24 b wrapper_exit LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 .export sys_vfork_wrapper sys_vfork_wrapper: LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ reg_save %r1 mfctl %cr27, %r3 STREG %r3, PT_CR27(%r1) STREG %r2,-RP_OFFSET(%r30) ldo FRAME_SIZE(%r30),%r30 #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif STREG %r2,PT_GR19(%r1) /* save for child */ STREG %r30,PT_GR21(%r1) bl sys_vfork,%r2 copy %r1,%r26 b wrapper_exit LDREG -RP_OFFSET-FRAME_SIZE(%r30),%r2 .macro execve_wrapper execve LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1),%r1 /* get pt regs */ /* * Do we need to save/restore r3-r18 here? * I don't think so. why would new thread need old * threads registers? */ /* %arg0 - %arg3 are already saved for us. */ STREG %r2,-RP_OFFSET(%r30) ldo FRAME_SIZE(%r30),%r30 #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif bl \execve,%r2 copy %r1,%arg0 ldo -FRAME_SIZE(%r30),%r30 LDREG -RP_OFFSET(%r30),%r2 /* If exec succeeded we need to load the args */ ldo -1024(%r0),%r1 cmpb,>>= %r28,%r1,error_\execve copy %r2,%r19 error_\execve: bv %r0(%r19) nop .endm .export sys_execve_wrapper .import sys_execve sys_execve_wrapper: execve_wrapper sys_execve #ifdef __LP64__ .export sys32_execve_wrapper .import sys32_execve sys32_execve_wrapper: execve_wrapper sys32_execve #endif .export sys_rt_sigreturn_wrapper sys_rt_sigreturn_wrapper: LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%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 __LP64__ 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. */ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%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 */ .export sys_sigaltstack_wrapper sys_sigaltstack_wrapper: /* Get the user stack pointer */ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1),%r24 /* get pt regs */ LDREG TASK_PT_GR30(%r24),%r24 STREG %r2, -RP_OFFSET(%r30) #ifdef __LP64__ ldo FRAME_SIZE(%r30), %r30 bl do_sigaltstack,%r2 ldo -16(%r30),%r29 /* Reference param save area */ #else bl do_sigaltstack,%r2 ldo FRAME_SIZE(%r30), %r30 #endif ldo -FRAME_SIZE(%r30), %r30 LDREG -RP_OFFSET(%r30), %r2 bv %r0(%r2) nop #ifdef __LP64__ .export sys32_sigaltstack_wrapper sys32_sigaltstack_wrapper: /* Get the user stack pointer */ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r24 LDREG TASK_PT_GR30(%r24),%r24 STREG %r2, -RP_OFFSET(%r30) ldo FRAME_SIZE(%r30), %r30 bl do_sigaltstack32,%r2 ldo -16(%r30),%r29 /* Reference param save area */ ldo -FRAME_SIZE(%r30), %r30 LDREG -RP_OFFSET(%r30), %r2 bv %r0(%r2) nop #endif .export sys_rt_sigsuspend_wrapper sys_rt_sigsuspend_wrapper: LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 ldo TASK_REGS(%r1),%r24 reg_save %r24 STREG %r2, -RP_OFFSET(%r30) #ifdef __LP64__ ldo FRAME_SIZE(%r30), %r30 bl sys_rt_sigsuspend,%r2 ldo -16(%r30),%r29 /* Reference param save area */ #else bl sys_rt_sigsuspend,%r2 ldo FRAME_SIZE(%r30), %r30 #endif ldo -FRAME_SIZE(%r30), %r30 LDREG -RP_OFFSET(%r30), %r2 LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30), %r1 ldo TASK_REGS(%r1),%r1 reg_restore %r1 bv %r0(%r2) nop .export syscall_exit syscall_exit: /* NOTE: HP-UX syscalls also come through here after hpux_syscall_exit fixes up return values. */ /* 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 LDREG TI_TASK(%r1),%r1 STREG %r28,TASK_PT_GR28(%r1) #ifdef CONFIG_HPUX /* <linux/personality.h> cannot be easily included */ #define PER_HPUX 0x10 LDREG TASK_PERSONALITY(%r1),%r19 /* We can't use "CMPIB<> PER_HPUX" since "im5" field is sign extended */ ldo -PER_HPUX(%r19), %r19 CMPIB<>,n 0,%r19,1f /* Save other hpux returns if personality is PER_HPUX */ STREG %r22,TASK_PT_GR22(%r1) STREG %r29,TASK_PT_GR29(%r1) 1: #endif /* CONFIG_HPUX */ /* 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_bh: /* Check for software interrupts */ .import irq_stat,data ldil L%irq_stat,%r19 ldo R%irq_stat(%r19),%r19 #ifdef CONFIG_SMP /* sched.h: int processor */ /* %r26 is used as scratch register to index into irq_stat[] */ ldw TI_CPU-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r26 /* cpu # */ /* shift left ____cacheline_aligned (aka L1_CACHE_BYTES) bits */ #ifdef __LP64__ shld %r26, 6, %r20 #else shlw %r26, 5, %r20 #endif add %r19,%r20,%r19 /* now have &irq_stat[smp_processor_id()] */ #endif /* CONFIG_SMP */ LDREG IRQSTAT_SIRQ_PEND(%r19),%r20 /* hardirq.h: unsigned long */ cmpib,<>,n 0,%r20,syscall_do_softirq /* forward */ syscall_check_resched: /* check for reschedule */ LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* long */ bb,<,n %r19, 31-TIF_NEED_RESCHED, syscall_do_resched /* forward */ syscall_check_sig: LDREG TI_FLAGS-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r19 /* get ti flags */ bb,<,n %r19, 31-TIF_SIGPENDING, syscall_do_signal /* forward */ syscall_restore: /* Are we being ptraced? */ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 LDREG TASK_PTRACE(%r1), %r19 bb,< %r19,31,syscall_restore_rfi nop 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 */ rsm PSW_SM_I, %r0 LDREG TASK_PT_GR30(%r1),%r30 /* restore user sp */ mfsp %sr3,%r1 /* Get users space id */ mtsp %r1,%sr7 /* Restore sr7 */ ssm PSW_SM_I, %r0 mtsp %r1,%sr4 /* Restore sr4 */ mtsp %r1,%sr5 /* Restore sr5 */ mtsp %r1,%sr6 /* Restore sr6 */ depi 3,31,2,%r31 /* ensure return to user mode. */ #ifdef __LP64__ /* 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 PA_SINGLESTEP_BIT and PA_BLOCKSTEP_BIT are * set in include/linux/ptrace.h and converted to PA bitmap * numbers in asm-offsets.c */ /* if ((%r19.PA_SINGLESTEP_BIT)) { %r20.27=1} */ extru,= %r19,PA_SINGLESTEP_BIT,1,%r0 depi -1,27,1,%r20 /* R bit */ /* if ((%r19.PA_BLOCKSTEP_BIT)) { %r20.7=1} */ extru,= %r19,PA_BLOCKSTEP_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 */ mfsp %sr0,%r2 STREG %r2,TASK_PT_SR0(%r1) mfsp %sr1,%r2 STREG %r2,TASK_PT_SR1(%r1) mfsp %sr2,%r2 STREG %r2,TASK_PT_SR2(%r1) pt_regs_ok: LDREG TASK_PT_GR31(%r1),%r2 depi 3,31,2,%r2 /* ensure return to user mode. */ STREG %r2,TASK_PT_IAOQ0(%r1) ldo 4(%r2),%r2 STREG %r2,TASK_PT_IAOQ1(%r1) copy %r25,%r16 b intr_restore nop .import do_softirq,code syscall_do_softirq: bl do_softirq,%r2 nop b syscall_check_resched ssm PSW_SM_I, %r0 /* do_softirq returns with I bit off */ .import schedule,code syscall_do_resched: bl schedule,%r2 #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #else nop #endif b syscall_check_bh /* if resched, we start over again */ nop .import do_signal,code 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. */ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1), %r25 /* struct pt_regs *regs */ reg_save %r25 ldi 1, %r24 /* unsigned long in_syscall */ #ifdef __LP64__ ldo -16(%r30),%r29 /* Reference param save area */ #endif bl do_signal,%r2 copy %r0, %r26 /* sigset_t *oldset = NULL */ LDREG TI_TASK-THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 ldo TASK_REGS(%r1), %r20 /* reload pt_regs */ reg_restore %r20 b,n syscall_restore /* * 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). */ get_register: 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 /* * set_register is used by the non access tlb miss handlers to * copy the value of r1 into the general register specified in * r8. */ set_register: 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