diff options
Diffstat (limited to 'arch/parisc/mm')
| -rw-r--r-- | arch/parisc/mm/fault.c | 101 | ||||
| -rw-r--r-- | arch/parisc/mm/init.c | 79 |
2 files changed, 111 insertions, 69 deletions
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c index 00c0ed333a3..3ca9c1131cf 100644 --- a/arch/parisc/mm/fault.c +++ b/arch/parisc/mm/fault.c @@ -19,10 +19,6 @@ #include <asm/uaccess.h> #include <asm/traps.h> -#define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */ - /* dumped to the console via printk) */ - - /* Various important other fields */ #define bit22set(x) (x & 0x00000200) #define bits23_25set(x) (x & 0x000001c0) @@ -34,6 +30,8 @@ DEFINE_PER_CPU(struct exception_data, exception_data); +int show_unhandled_signals = 1; + /* * parisc_acctyp(unsigned int inst) -- * Given a PA-RISC memory access instruction, determine if the @@ -142,10 +140,16 @@ int fixup_exception(struct pt_regs *regs) { const struct exception_table_entry *fix; + /* If we only stored 32bit addresses in the exception table we can drop + * out if we faulted on a 64bit address. */ + if ((sizeof(regs->iaoq[0]) > sizeof(fix->insn)) + && (regs->iaoq[0] >> 32)) + return 0; + fix = search_exception_tables(regs->iaoq[0]); if (fix) { struct exception_data *d; - d = &__get_cpu_var(exception_data); + d = this_cpu_ptr(&exception_data); d->fault_ip = regs->iaoq[0]; d->fault_space = regs->isr; d->fault_addr = regs->ior; @@ -167,24 +171,55 @@ int fixup_exception(struct pt_regs *regs) return 0; } +/* + * Print out info about fatal segfaults, if the show_unhandled_signals + * sysctl is set: + */ +static inline void +show_signal_msg(struct pt_regs *regs, unsigned long code, + unsigned long address, struct task_struct *tsk, + struct vm_area_struct *vma) +{ + if (!unhandled_signal(tsk, SIGSEGV)) + return; + + if (!printk_ratelimit()) + return; + + pr_warn("\n"); + pr_warn("do_page_fault() command='%s' type=%lu address=0x%08lx", + tsk->comm, code, address); + print_vma_addr(KERN_CONT " in ", regs->iaoq[0]); + if (vma) + pr_warn(" vm_start = 0x%08lx, vm_end = 0x%08lx\n", + vma->vm_start, vma->vm_end); + + show_regs(regs); +} + void do_page_fault(struct pt_regs *regs, unsigned long code, unsigned long address) { struct vm_area_struct *vma, *prev_vma; - struct task_struct *tsk = current; - struct mm_struct *mm = tsk->mm; + struct task_struct *tsk; + struct mm_struct *mm; unsigned long acc_type; int fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags; + + if (in_atomic()) + goto no_context; - if (in_atomic() || !mm) + tsk = current; + mm = tsk->mm; + if (!mm) goto no_context; + flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; if (user_mode(regs)) flags |= FAULT_FLAG_USER; acc_type = parisc_acctyp(code, regs->iir); - if (acc_type & VM_WRITE) flags |= FAULT_FLAG_WRITE; retry: @@ -259,22 +294,42 @@ bad_area: if (user_mode(regs)) { struct siginfo si; -#ifdef PRINT_USER_FAULTS - printk(KERN_DEBUG "\n"); - printk(KERN_DEBUG "do_page_fault() pid=%d command='%s' type=%lu address=0x%08lx\n", - task_pid_nr(tsk), tsk->comm, code, address); - if (vma) { - printk(KERN_DEBUG "vm_start = 0x%08lx, vm_end = 0x%08lx\n", - vma->vm_start, vma->vm_end); + show_signal_msg(regs, code, address, tsk, vma); + + switch (code) { + case 15: /* Data TLB miss fault/Data page fault */ + /* send SIGSEGV when outside of vma */ + if (!vma || + address < vma->vm_start || address > vma->vm_end) { + si.si_signo = SIGSEGV; + si.si_code = SEGV_MAPERR; + break; + } + + /* send SIGSEGV for wrong permissions */ + if ((vma->vm_flags & acc_type) != acc_type) { + si.si_signo = SIGSEGV; + si.si_code = SEGV_ACCERR; + break; + } + + /* probably address is outside of mapped file */ + /* fall through */ + case 17: /* NA data TLB miss / page fault */ + case 18: /* Unaligned access - PCXS only */ + si.si_signo = SIGBUS; + si.si_code = (code == 18) ? BUS_ADRALN : BUS_ADRERR; + break; + case 16: /* Non-access instruction TLB miss fault */ + case 26: /* PCXL: Data memory access rights trap */ + default: + si.si_signo = SIGSEGV; + si.si_code = (code == 26) ? SEGV_ACCERR : SEGV_MAPERR; + break; } - show_regs(regs); -#endif - /* FIXME: actually we need to get the signo and code correct */ - si.si_signo = SIGSEGV; si.si_errno = 0; - si.si_code = SEGV_MAPERR; si.si_addr = (void __user *) address; - force_sig_info(SIGSEGV, &si, current); + force_sig_info(si.si_signo, &si, current); return; } diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c index b0f96c0e631..0bef864264c 100644 --- a/arch/parisc/mm/init.c +++ b/arch/parisc/mm/init.c @@ -32,6 +32,7 @@ #include <asm/sections.h> extern int data_start; +extern void parisc_kernel_start(void); /* Kernel entry point in head.S */ #if PT_NLEVELS == 3 /* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout @@ -324,8 +325,9 @@ static void __init setup_bootmem(void) reserve_bootmem_node(NODE_DATA(0), 0UL, (unsigned long)(PAGE0->mem_free + PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT); - reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text), - (unsigned long)(_end - _text), BOOTMEM_DEFAULT); + reserve_bootmem_node(NODE_DATA(0), __pa(KERNEL_BINARY_TEXT_START), + (unsigned long)(_end - KERNEL_BINARY_TEXT_START), + BOOTMEM_DEFAULT); reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT), ((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT), BOOTMEM_DEFAULT); @@ -378,6 +380,17 @@ static void __init setup_bootmem(void) request_resource(&sysram_resources[0], &pdcdata_resource); } +static int __init parisc_text_address(unsigned long vaddr) +{ + static unsigned long head_ptr __initdata; + + if (!head_ptr) + head_ptr = PAGE_MASK & (unsigned long) + dereference_function_descriptor(&parisc_kernel_start); + + return core_kernel_text(vaddr) || vaddr == head_ptr; +} + static void __init map_pages(unsigned long start_vaddr, unsigned long start_paddr, unsigned long size, pgprot_t pgprot, int force) @@ -466,7 +479,7 @@ static void __init map_pages(unsigned long start_vaddr, */ if (force) pte = __mk_pte(address, pgprot); - else if (core_kernel_text(vaddr) && + else if (parisc_text_address(vaddr) && address != fv_addr) pte = __mk_pte(address, PAGE_KERNEL_EXEC); else @@ -632,55 +645,30 @@ EXPORT_SYMBOL(empty_zero_page); void show_mem(unsigned int filter) { - int i,free = 0,total = 0,reserved = 0; - int shared = 0, cached = 0; + int total = 0,reserved = 0; + pg_data_t *pgdat; printk(KERN_INFO "Mem-info:\n"); show_free_areas(filter); - if (filter & SHOW_MEM_FILTER_PAGE_COUNT) - return; -#ifndef CONFIG_DISCONTIGMEM - i = max_mapnr; - while (i-- > 0) { - total++; - if (PageReserved(mem_map+i)) - reserved++; - else if (PageSwapCache(mem_map+i)) - cached++; - else if (!page_count(&mem_map[i])) - free++; - else - shared += page_count(&mem_map[i]) - 1; - } -#else - for (i = 0; i < npmem_ranges; i++) { - int j; - for (j = node_start_pfn(i); j < node_end_pfn(i); j++) { - struct page *p; - unsigned long flags; - - pgdat_resize_lock(NODE_DATA(i), &flags); - p = nid_page_nr(i, j) - node_start_pfn(i); - - total++; - if (PageReserved(p)) - reserved++; - else if (PageSwapCache(p)) - cached++; - else if (!page_count(p)) - free++; - else - shared += page_count(p) - 1; - pgdat_resize_unlock(NODE_DATA(i), &flags); - } + for_each_online_pgdat(pgdat) { + unsigned long flags; + int zoneid; + + pgdat_resize_lock(pgdat, &flags); + for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) { + struct zone *zone = &pgdat->node_zones[zoneid]; + if (!populated_zone(zone)) + continue; + + total += zone->present_pages; + reserved = zone->present_pages - zone->managed_pages; + } + pgdat_resize_unlock(pgdat, &flags); } -#endif + printk(KERN_INFO "%d pages of RAM\n", total); printk(KERN_INFO "%d reserved pages\n", reserved); - printk(KERN_INFO "%d pages shared\n", shared); - printk(KERN_INFO "%d pages swap cached\n", cached); - #ifdef CONFIG_DISCONTIGMEM { @@ -740,7 +728,6 @@ static void __init pagetable_init(void) #endif empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); - memset(empty_zero_page, 0, PAGE_SIZE); } static void __init gateway_init(void) |