Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 527 insertions, 0 deletions

diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
new file mode 100644
index 0000000..3ffee7b
--- /dev/null
+++ b/arch/sparc64/mm/fault.c
@@ -0,0 +1,527 @@
+/* $Id: fault.c,v 1.59 2002/02/09 19:49:31 davem Exp $
+ * arch/sparc64/mm/fault.c: Page fault handlers for the 64-bit Sparc.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz)
+ */
+
+#include <asm/head.h>
+
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/signal.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/uaccess.h>
+#include <asm/asi.h>
+#include <asm/lsu.h>
+#include <asm/sections.h>
+#include <asm/kdebug.h>
+
+#define ELEMENTS(arr) (sizeof (arr)/sizeof (arr[0]))
+
+extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
+
+/*
+ * To debug kernel during syscall entry.
+ */
+void syscall_trace_entry(struct pt_regs *regs)
+{
+	printk("scall entry: %s[%d]/cpu%d: %d\n", current->comm, current->pid, smp_processor_id(), (int) regs->u_regs[UREG_G1]);
+}
+
+/*
+ * To debug kernel during syscall exit.
+ */
+void syscall_trace_exit(struct pt_regs *regs)
+{
+	printk("scall exit: %s[%d]/cpu%d: %d\n", current->comm, current->pid, smp_processor_id(), (int) regs->u_regs[UREG_G1]);
+}
+
+/*
+ * To debug kernel to catch accesses to certain virtual/physical addresses.
+ * Mode = 0 selects physical watchpoints, mode = 1 selects virtual watchpoints.
+ * flags = VM_READ watches memread accesses, flags = VM_WRITE watches memwrite accesses.
+ * Caller passes in a 64bit aligned addr, with mask set to the bytes that need to be
+ * watched. This is only useful on a single cpu machine for now. After the watchpoint
+ * is detected, the process causing it will be killed, thus preventing an infinite loop.
+ */
+void set_brkpt(unsigned long addr, unsigned char mask, int flags, int mode)
+{
+	unsigned long lsubits;
+
+	__asm__ __volatile__("ldxa [%%g0] %1, %0"
+			     : "=r" (lsubits)
+			     : "i" (ASI_LSU_CONTROL));
+	lsubits &= ~(LSU_CONTROL_PM | LSU_CONTROL_VM |
+		     LSU_CONTROL_PR | LSU_CONTROL_VR |
+		     LSU_CONTROL_PW | LSU_CONTROL_VW);
+
+	__asm__ __volatile__("stxa	%0, [%1] %2\n\t"
+			     "membar	#Sync"
+			     : /* no outputs */
+			     : "r" (addr), "r" (mode ? VIRT_WATCHPOINT : PHYS_WATCHPOINT),
+			       "i" (ASI_DMMU));
+
+	lsubits |= ((unsigned long)mask << (mode ? 25 : 33));
+	if (flags & VM_READ)
+		lsubits |= (mode ? LSU_CONTROL_VR : LSU_CONTROL_PR);
+	if (flags & VM_WRITE)
+		lsubits |= (mode ? LSU_CONTROL_VW : LSU_CONTROL_PW);
+	__asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
+			     "membar #Sync"
+			     : /* no outputs */
+			     : "r" (lsubits), "i" (ASI_LSU_CONTROL)
+			     : "memory");
+}
+
+/* Nice, simple, prom library does all the sweating for us. ;) */
+unsigned long __init prom_probe_memory (void)
+{
+	register struct linux_mlist_p1275 *mlist;
+	register unsigned long bytes, base_paddr, tally;
+	register int i;
+
+	i = 0;
+	mlist = *prom_meminfo()->p1275_available;
+	bytes = tally = mlist->num_bytes;
+	base_paddr = mlist->start_adr;
+  
+	sp_banks[0].base_addr = base_paddr;
+	sp_banks[0].num_bytes = bytes;
+
+	while (mlist->theres_more != (void *) 0) {
+		i++;
+		mlist = mlist->theres_more;
+		bytes = mlist->num_bytes;
+		tally += bytes;
+		if (i >= SPARC_PHYS_BANKS-1) {
+			printk ("The machine has more banks than "
+				"this kernel can support\n"
+				"Increase the SPARC_PHYS_BANKS "
+				"setting (currently %d)\n",
+				SPARC_PHYS_BANKS);
+			i = SPARC_PHYS_BANKS-1;
+			break;
+		}
+    
+		sp_banks[i].base_addr = mlist->start_adr;
+		sp_banks[i].num_bytes = mlist->num_bytes;
+	}
+
+	i++;
+	sp_banks[i].base_addr = 0xdeadbeefbeefdeadUL;
+	sp_banks[i].num_bytes = 0;
+
+	/* Now mask all bank sizes on a page boundary, it is all we can
+	 * use anyways.
+	 */
+	for (i = 0; sp_banks[i].num_bytes != 0; i++)
+		sp_banks[i].num_bytes &= PAGE_MASK;
+
+	return tally;
+}
+
+static void unhandled_fault(unsigned long address, struct task_struct *tsk,
+			    struct pt_regs *regs)
+{
+	if ((unsigned long) address < PAGE_SIZE) {
+		printk(KERN_ALERT "Unable to handle kernel NULL "
+		       "pointer dereference\n");
+	} else {
+		printk(KERN_ALERT "Unable to handle kernel paging request "
+		       "at virtual address %016lx\n", (unsigned long)address);
+	}
+	printk(KERN_ALERT "tsk->{mm,active_mm}->context = %016lx\n",
+	       (tsk->mm ?
+		CTX_HWBITS(tsk->mm->context) :
+		CTX_HWBITS(tsk->active_mm->context)));
+	printk(KERN_ALERT "tsk->{mm,active_mm}->pgd = %016lx\n",
+	       (tsk->mm ? (unsigned long) tsk->mm->pgd :
+		          (unsigned long) tsk->active_mm->pgd));
+	if (notify_die(DIE_GPF, "general protection fault", regs,
+		       0, 0, SIGSEGV) == NOTIFY_STOP)
+		return;
+	die_if_kernel("Oops", regs);
+}
+
+static void bad_kernel_pc(struct pt_regs *regs)
+{
+	unsigned long *ksp;
+
+	printk(KERN_CRIT "OOPS: Bogus kernel PC [%016lx] in fault handler\n",
+	       regs->tpc);
+	__asm__("mov %%sp, %0" : "=r" (ksp));
+	show_stack(current, ksp);
+	unhandled_fault(regs->tpc, current, regs);
+}
+
+/*
+ * We now make sure that mmap_sem is held in all paths that call 
+ * this. Additionally, to prevent kswapd from ripping ptes from
+ * under us, raise interrupts around the time that we look at the
+ * pte, kswapd will have to wait to get his smp ipi response from
+ * us. This saves us having to get page_table_lock.
+ */
+static unsigned int get_user_insn(unsigned long tpc)
+{
+	pgd_t *pgdp = pgd_offset(current->mm, tpc);
+	pud_t *pudp;
+	pmd_t *pmdp;
+	pte_t *ptep, pte;
+	unsigned long pa;
+	u32 insn = 0;
+	unsigned long pstate;
+
+	if (pgd_none(*pgdp))
+		goto outret;
+	pudp = pud_offset(pgdp, tpc);
+	if (pud_none(*pudp))
+		goto outret;
+	pmdp = pmd_offset(pudp, tpc);
+	if (pmd_none(*pmdp))
+		goto outret;
+
+	/* This disables preemption for us as well. */
+	__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
+	__asm__ __volatile__("wrpr %0, %1, %%pstate"
+				: : "r" (pstate), "i" (PSTATE_IE));
+	ptep = pte_offset_map(pmdp, tpc);
+	pte = *ptep;
+	if (!pte_present(pte))
+		goto out;
+
+	pa  = (pte_val(pte) & _PAGE_PADDR);
+	pa += (tpc & ~PAGE_MASK);
+
+	/* Use phys bypass so we don't pollute dtlb/dcache. */
+	__asm__ __volatile__("lduwa [%1] %2, %0"
+			     : "=r" (insn)
+			     : "r" (pa), "i" (ASI_PHYS_USE_EC));
+
+out:
+	pte_unmap(ptep);
+	__asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
+outret:
+	return insn;
+}
+
+extern unsigned long compute_effective_address(struct pt_regs *, unsigned int, unsigned int);
+
+static void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
+			     unsigned int insn, int fault_code)
+{
+	siginfo_t info;
+
+	info.si_code = code;
+	info.si_signo = sig;
+	info.si_errno = 0;
+	if (fault_code & FAULT_CODE_ITLB)
+		info.si_addr = (void __user *) regs->tpc;
+	else
+		info.si_addr = (void __user *)
+			compute_effective_address(regs, insn, 0);
+	info.si_trapno = 0;
+	force_sig_info(sig, &info, current);
+}
+
+extern int handle_ldf_stq(u32, struct pt_regs *);
+extern int handle_ld_nf(u32, struct pt_regs *);
+
+static unsigned int get_fault_insn(struct pt_regs *regs, unsigned int insn)
+{
+	if (!insn) {
+		if (!regs->tpc || (regs->tpc & 0x3))
+			return 0;
+		if (regs->tstate & TSTATE_PRIV) {
+			insn = *(unsigned int *) regs->tpc;
+		} else {
+			insn = get_user_insn(regs->tpc);
+		}
+	}
+	return insn;
+}
+
+static void do_kernel_fault(struct pt_regs *regs, int si_code, int fault_code,
+			    unsigned int insn, unsigned long address)
+{
+	unsigned long g2;
+	unsigned char asi = ASI_P;
+ 
+	if ((!insn) && (regs->tstate & TSTATE_PRIV))
+		goto cannot_handle;
+
+	/* If user insn could be read (thus insn is zero), that
+	 * is fine.  We will just gun down the process with a signal
+	 * in that case.
+	 */
+
+	if (!(fault_code & (FAULT_CODE_WRITE|FAULT_CODE_ITLB)) &&
+	    (insn & 0xc0800000) == 0xc0800000) {
+		if (insn & 0x2000)
+			asi = (regs->tstate >> 24);
+		else
+			asi = (insn >> 5);
+		if ((asi & 0xf2) == 0x82) {
+			if (insn & 0x1000000) {
+				handle_ldf_stq(insn, regs);
+			} else {
+				/* This was a non-faulting load. Just clear the
+				 * destination register(s) and continue with the next
+				 * instruction. -jj
+				 */
+				handle_ld_nf(insn, regs);
+			}
+			return;
+		}
+	}
+		
+	g2 = regs->u_regs[UREG_G2];
+
+	/* Is this in ex_table? */
+	if (regs->tstate & TSTATE_PRIV) {
+		unsigned long fixup;
+
+		if (asi == ASI_P && (insn & 0xc0800000) == 0xc0800000) {
+			if (insn & 0x2000)
+				asi = (regs->tstate >> 24);
+			else
+				asi = (insn >> 5);
+		}
+	
+		/* Look in asi.h: All _S asis have LS bit set */
+		if ((asi & 0x1) &&
+		    (fixup = search_extables_range(regs->tpc, &g2))) {
+			regs->tpc = fixup;
+			regs->tnpc = regs->tpc + 4;
+			regs->u_regs[UREG_G2] = g2;
+			return;
+		}
+	} else {
+		/* The si_code was set to make clear whether
+		 * this was a SEGV_MAPERR or SEGV_ACCERR fault.
+		 */
+		do_fault_siginfo(si_code, SIGSEGV, regs, insn, fault_code);
+		return;
+	}
+
+cannot_handle:
+	unhandled_fault (address, current, regs);
+}
+
+asmlinkage void do_sparc64_fault(struct pt_regs *regs)
+{
+	struct mm_struct *mm = current->mm;
+	struct vm_area_struct *vma;
+	unsigned int insn = 0;
+	int si_code, fault_code;
+	unsigned long address;
+
+	fault_code = get_thread_fault_code();
+
+	if (notify_die(DIE_PAGE_FAULT, "page_fault", regs,
+		       fault_code, 0, SIGSEGV) == NOTIFY_STOP)
+		return;
+
+	si_code = SEGV_MAPERR;
+	address = current_thread_info()->fault_address;
+
+	if ((fault_code & FAULT_CODE_ITLB) &&
+	    (fault_code & FAULT_CODE_DTLB))
+		BUG();
+
+	if (regs->tstate & TSTATE_PRIV) {
+		unsigned long tpc = regs->tpc;
+
+		/* Sanity check the PC. */
+		if ((tpc >= KERNBASE && tpc < (unsigned long) _etext) ||
+		    (tpc >= MODULES_VADDR && tpc < MODULES_END)) {
+			/* Valid, no problems... */
+		} else {
+			bad_kernel_pc(regs);
+			return;
+		}
+	}
+
+	/*
+	 * If we're in an interrupt or have no user
+	 * context, we must not take the fault..
+	 */
+	if (in_atomic() || !mm)
+		goto intr_or_no_mm;
+
+	if (test_thread_flag(TIF_32BIT)) {
+		if (!(regs->tstate & TSTATE_PRIV))
+			regs->tpc &= 0xffffffff;
+		address &= 0xffffffff;
+	}
+
+	if (!down_read_trylock(&mm->mmap_sem)) {
+		if ((regs->tstate & TSTATE_PRIV) &&
+		    !search_exception_tables(regs->tpc)) {
+			insn = get_fault_insn(regs, insn);
+			goto handle_kernel_fault;
+		}
+		down_read(&mm->mmap_sem);
+	}
+
+	vma = find_vma(mm, address);
+	if (!vma)
+		goto bad_area;
+
+	/* Pure DTLB misses do not tell us whether the fault causing
+	 * load/store/atomic was a write or not, it only says that there
+	 * was no match.  So in such a case we (carefully) read the
+	 * instruction to try and figure this out.  It's an optimization
+	 * so it's ok if we can't do this.
+	 *
+	 * Special hack, window spill/fill knows the exact fault type.
+	 */
+	if (((fault_code &
+	      (FAULT_CODE_DTLB | FAULT_CODE_WRITE | FAULT_CODE_WINFIXUP)) == FAULT_CODE_DTLB) &&
+	    (vma->vm_flags & VM_WRITE) != 0) {
+		insn = get_fault_insn(regs, 0);
+		if (!insn)
+			goto continue_fault;
+		if ((insn & 0xc0200000) == 0xc0200000 &&
+		    (insn & 0x1780000) != 0x1680000) {
+			/* Don't bother updating thread struct value,
+			 * because update_mmu_cache only cares which tlb
+			 * the access came from.
+			 */
+			fault_code |= FAULT_CODE_WRITE;
+		}
+	}
+continue_fault:
+
+	if (vma->vm_start <= address)
+		goto good_area;
+	if (!(vma->vm_flags & VM_GROWSDOWN))
+		goto bad_area;
+	if (!(fault_code & FAULT_CODE_WRITE)) {
+		/* Non-faulting loads shouldn't expand stack. */
+		insn = get_fault_insn(regs, insn);
+		if ((insn & 0xc0800000) == 0xc0800000) {
+			unsigned char asi;
+
+			if (insn & 0x2000)
+				asi = (regs->tstate >> 24);
+			else
+				asi = (insn >> 5);
+			if ((asi & 0xf2) == 0x82)
+				goto bad_area;
+		}
+	}
+	if (expand_stack(vma, address))
+		goto bad_area;
+	/*
+	 * Ok, we have a good vm_area for this memory access, so
+	 * we can handle it..
+	 */
+good_area:
+	si_code = SEGV_ACCERR;
+
+	/* If we took a ITLB miss on a non-executable page, catch
+	 * that here.
+	 */
+	if ((fault_code & FAULT_CODE_ITLB) && !(vma->vm_flags & VM_EXEC)) {
+		BUG_ON(address != regs->tpc);
+		BUG_ON(regs->tstate & TSTATE_PRIV);
+		goto bad_area;
+	}
+
+	if (fault_code & FAULT_CODE_WRITE) {
+		if (!(vma->vm_flags & VM_WRITE))
+			goto bad_area;
+
+		/* Spitfire has an icache which does not snoop
+		 * processor stores.  Later processors do...
+		 */
+		if (tlb_type == spitfire &&
+		    (vma->vm_flags & VM_EXEC) != 0 &&
+		    vma->vm_file != NULL)
+			set_thread_fault_code(fault_code |
+					      FAULT_CODE_BLKCOMMIT);
+	} else {
+		/* Allow reads even for write-only mappings */
+		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+			goto bad_area;
+	}
+
+	switch (handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE))) {
+	case VM_FAULT_MINOR:
+		current->min_flt++;
+		break;
+	case VM_FAULT_MAJOR:
+		current->maj_flt++;
+		break;
+	case VM_FAULT_SIGBUS:
+		goto do_sigbus;
+	case VM_FAULT_OOM:
+		goto out_of_memory;
+	default:
+		BUG();
+	}
+
+	up_read(&mm->mmap_sem);
+	goto fault_done;
+
+	/*
+	 * Something tried to access memory that isn't in our memory map..
+	 * Fix it, but check if it's kernel or user first..
+	 */
+bad_area:
+	insn = get_fault_insn(regs, insn);
+	up_read(&mm->mmap_sem);
+
+handle_kernel_fault:
+	do_kernel_fault(regs, si_code, fault_code, insn, address);
+
+	goto fault_done;
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+out_of_memory:
+	insn = get_fault_insn(regs, insn);
+	up_read(&mm->mmap_sem);
+	printk("VM: killing process %s\n", current->comm);
+	if (!(regs->tstate & TSTATE_PRIV))
+		do_exit(SIGKILL);
+	goto handle_kernel_fault;
+
+intr_or_no_mm:
+	insn = get_fault_insn(regs, 0);
+	goto handle_kernel_fault;
+
+do_sigbus:
+	insn = get_fault_insn(regs, insn);
+	up_read(&mm->mmap_sem);
+
+	/*
+	 * Send a sigbus, regardless of whether we were in kernel
+	 * or user mode.
+	 */
+	do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, insn, fault_code);
+
+	/* Kernel mode? Handle exceptions or die */
+	if (regs->tstate & TSTATE_PRIV)
+		goto handle_kernel_fault;
+
+fault_done:
+	/* These values are no longer needed, clear them. */
+	set_thread_fault_code(0);
+	current_thread_info()->fault_address = 0;
+}