aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/uprobes.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/kernel/uprobes.c')
-rw-r--r--arch/sparc/kernel/uprobes.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/arch/sparc/kernel/uprobes.c b/arch/sparc/kernel/uprobes.c
new file mode 100644
index 000000000000..b68314050602
--- /dev/null
+++ b/arch/sparc/kernel/uprobes.c
@@ -0,0 +1,331 @@
+/*
+ * User-space Probes (UProbes) for sparc
+ *
+ * Copyright (C) 2013 Oracle Inc.
+ *
+ * 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 of the License, 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Jose E. Marchesi <jose.marchesi@oracle.com>
+ * Eric Saint Etienne <eric.saint.etienne@oracle.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/highmem.h>
+#include <linux/uprobes.h>
+#include <linux/uaccess.h>
+#include <linux/sched.h> /* For struct task_struct */
+#include <linux/kdebug.h>
+
+#include <asm/cacheflush.h>
+#include <asm/uaccess.h>
+
+/* Compute the address of the breakpoint instruction and return it.
+ *
+ * Note that uprobe_get_swbp_addr is defined as a weak symbol in
+ * kernel/events/uprobe.c.
+ */
+unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
+{
+ return instruction_pointer(regs);
+}
+
+static void copy_to_page(struct page *page, unsigned long vaddr,
+ const void *src, int len)
+{
+ void *kaddr = kmap_atomic(page);
+
+ memcpy(kaddr + (vaddr & ~PAGE_MASK), src, len);
+ kunmap_atomic(kaddr);
+}
+
+/* Fill in the xol area with the probed instruction followed by the
+ * single-step trap. Some fixups in the copied instruction are
+ * performed at this point.
+ *
+ * Note that uprobe_xol_copy is defined as a weak symbol in
+ * kernel/events/uprobe.c.
+ */
+void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
+ void *src, unsigned long len)
+{
+ const u32 stp_insn = UPROBE_STP_INSN;
+ u32 insn = *(u32 *) src;
+
+ /* Branches annulling their delay slot must be fixed to not do
+ * so. Clearing the annul bit on these instructions we can be
+ * sure the single-step breakpoint in the XOL slot will be
+ * executed.
+ */
+
+ u32 op = (insn >> 30) & 0x3;
+ u32 op2 = (insn >> 22) & 0x7;
+
+ if (op == 0 &&
+ (op2 == 1 || op2 == 2 || op2 == 3 || op2 == 5 || op2 == 6) &&
+ (insn & ANNUL_BIT) == ANNUL_BIT)
+ insn &= ~ANNUL_BIT;
+
+ copy_to_page(page, vaddr, &insn, len);
+ copy_to_page(page, vaddr+len, &stp_insn, 4);
+}
+
+
+/* Instruction analysis/validity.
+ *
+ * This function returns 0 on success or a -ve number on error.
+ */
+int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe,
+ struct mm_struct *mm, unsigned long addr)
+{
+ /* Any unsupported instruction? Then return -EINVAL */
+ return 0;
+}
+
+/* If INSN is a relative control transfer instruction, return the
+ * corrected branch destination value.
+ *
+ * Note that regs->tpc and regs->tnpc still hold the values of the
+ * program counters at the time of the single-step trap due to the
+ * execution of the UPROBE_STP_INSN at utask->xol_vaddr + 4.
+ *
+ */
+static unsigned long relbranch_fixup(u32 insn, struct uprobe_task *utask,
+ struct pt_regs *regs)
+{
+ /* Branch not taken, no mods necessary. */
+ if (regs->tnpc == regs->tpc + 0x4UL)
+ return utask->autask.saved_tnpc + 0x4UL;
+
+ /* The three cases are call, branch w/prediction,
+ * and traditional branch.
+ */
+ if ((insn & 0xc0000000) == 0x40000000 ||
+ (insn & 0xc1c00000) == 0x00400000 ||
+ (insn & 0xc1c00000) == 0x00800000) {
+ unsigned long real_pc = (unsigned long) utask->vaddr;
+ unsigned long ixol_addr = utask->xol_vaddr;
+
+ /* The instruction did all the work for us
+ * already, just apply the offset to the correct
+ * instruction location.
+ */
+ return (real_pc + (regs->tnpc - ixol_addr));
+ }
+
+ /* It is jmpl or some other absolute PC modification instruction,
+ * leave NPC as-is.
+ */
+ return regs->tnpc;
+}
+
+/* If INSN is an instruction which writes its PC location
+ * into a destination register, fix that up.
+ */
+static int retpc_fixup(struct pt_regs *regs, u32 insn,
+ unsigned long real_pc)
+{
+ unsigned long *slot = NULL;
+ int rc = 0;
+
+ /* Simplest case is 'call', which always uses %o7 */
+ if ((insn & 0xc0000000) == 0x40000000)
+ slot = &regs->u_regs[UREG_I7];
+
+ /* 'jmpl' encodes the register inside of the opcode */
+ if ((insn & 0xc1f80000) == 0x81c00000) {
+ unsigned long rd = ((insn >> 25) & 0x1f);
+
+ if (rd <= 15) {
+ slot = &regs->u_regs[rd];
+ } else {
+ unsigned long fp = regs->u_regs[UREG_FP];
+ /* Hard case, it goes onto the stack. */
+ flushw_all();
+
+ rd -= 16;
+ if (test_thread_64bit_stack(fp)) {
+ unsigned long __user *uslot =
+ (unsigned long __user *) (fp + STACK_BIAS) + rd;
+ rc = __put_user(real_pc, uslot);
+ } else {
+ unsigned int __user *uslot = (unsigned int
+ __user *) fp + rd;
+ rc = __put_user((u32) real_pc, uslot);
+ }
+ }
+ }
+ if (slot != NULL)
+ *slot = real_pc;
+ return rc;
+}
+
+/* Single-stepping can be avoided for certain instructions: NOPs and
+ * instructions that can be emulated. This function determines
+ * whether the instruction where the uprobe is installed falls in one
+ * of these cases and emulates it.
+ *
+ * This function returns true if the single-stepping can be skipped,
+ * false otherwise.
+ */
+bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ /* We currently only emulate NOP instructions.
+ */
+
+ if (auprobe->ixol == (1 << 24)) {
+ regs->tnpc += 4;
+ regs->tpc += 4;
+ return true;
+ }
+
+ return false;
+}
+
+/* Prepare to execute out of line. At this point
+ * current->utask->xol_vaddr points to an allocated XOL slot properly
+ * initialized with the original instruction and the single-stepping
+ * trap instruction.
+ *
+ * This function returns 0 on success, any other number on error.
+ */
+int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ struct uprobe_task *utask = current->utask;
+ struct arch_uprobe_task *autask = &current->utask->autask;
+
+ /* Save the current program counters so they can be restored
+ * later.
+ */
+ autask->saved_tpc = regs->tpc;
+ autask->saved_tnpc = regs->tnpc;
+
+ /* Adjust PC and NPC so the first instruction in the XOL slot
+ * will be executed by the user task.
+ */
+ instruction_pointer_set(regs, utask->xol_vaddr);
+
+ return 0;
+}
+
+/* Prepare to resume execution after the single-step. Called after
+ * single-stepping. To avoid the SMP problems that can occur when we
+ * temporarily put back the original opcode to single-step, we
+ * single-stepped a copy of the instruction.
+ *
+ * This function returns 0 on success, any other number on error.
+ */
+int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ struct uprobe_task *utask = current->utask;
+ struct arch_uprobe_task *autask = &utask->autask;
+ u32 insn = auprobe->ixol;
+ int rc = 0;
+
+ if (utask->state == UTASK_SSTEP_ACK) {
+ regs->tnpc = relbranch_fixup(insn, utask, regs);
+ regs->tpc = autask->saved_tnpc;
+ rc = retpc_fixup(regs, insn, (unsigned long) utask->vaddr);
+ } else {
+ regs->tnpc = utask->vaddr+4;
+ regs->tpc = autask->saved_tnpc+4;
+ }
+ return rc;
+}
+
+/* Handler for uprobe traps. This is called from the traps table and
+ * triggers the proper die notification.
+ */
+asmlinkage void uprobe_trap(struct pt_regs *regs,
+ unsigned long trap_level)
+{
+ BUG_ON(trap_level != 0x173 && trap_level != 0x174);
+
+ /* We are only interested in user-mode code. Uprobe traps
+ * shall not be present in kernel code.
+ */
+ if (!user_mode(regs)) {
+ local_irq_enable();
+ bad_trap(regs, trap_level);
+ return;
+ }
+
+ /* trap_level == 0x173 --> ta 0x73
+ * trap_level == 0x174 --> ta 0x74
+ */
+ if (notify_die((trap_level == 0x173) ? DIE_BPT : DIE_SSTEP,
+ (trap_level == 0x173) ? "bpt" : "sstep",
+ regs, 0, trap_level, SIGTRAP) != NOTIFY_STOP)
+ bad_trap(regs, trap_level);
+}
+
+/* Callback routine for handling die notifications.
+*/
+int arch_uprobe_exception_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ int ret = NOTIFY_DONE;
+ struct die_args *args = (struct die_args *)data;
+
+ /* We are only interested in userspace traps */
+ if (args->regs && !user_mode(args->regs))
+ return NOTIFY_DONE;
+
+ switch (val) {
+ case DIE_BPT:
+ if (uprobe_pre_sstep_notifier(args->regs))
+ ret = NOTIFY_STOP;
+ break;
+
+ case DIE_SSTEP:
+ if (uprobe_post_sstep_notifier(args->regs))
+ ret = NOTIFY_STOP;
+
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+/* This function gets called when a XOL instruction either gets
+ * trapped or the thread has a fatal signal, so reset the instruction
+ * pointer to its probed address.
+ */
+void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+ struct uprobe_task *utask = current->utask;
+
+ instruction_pointer_set(regs, utask->vaddr);
+}
+
+/* If xol insn itself traps and generates a signal(Say,
+ * SIGILL/SIGSEGV/etc), then detect the case where a singlestepped
+ * instruction jumps back to its own address.
+ */
+bool arch_uprobe_xol_was_trapped(struct task_struct *t)
+{
+ return false;
+}
+
+unsigned long
+arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr,
+ struct pt_regs *regs)
+{
+ unsigned long orig_ret_vaddr = regs->u_regs[UREG_I7];
+
+ regs->u_regs[UREG_I7] = trampoline_vaddr-8;
+
+ return orig_ret_vaddr + 8;
+}