--- /dev/null
+/*
+ * arch/arm/kernel/unwind.c
+ *
+ * Copyright (C) 2008 ARM Limited
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * Stack unwinding support for ARM
+ *
+ * An ARM EABI version of gcc is required to generate the unwind
+ * tables. For information about the structure of the unwind tables,
+ * see "Exception Handling ABI for the ARM Architecture" at:
+ *
+ * http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+
+#include <asm/stacktrace.h>
+#include <asm/traps.h>
+#include <asm/unwind.h>
+
+/* Dummy functions to avoid linker complaints */
+void __aeabi_unwind_cpp_pr0(void)
+{
+};
+EXPORT_SYMBOL(__aeabi_unwind_cpp_pr0);
+
+void __aeabi_unwind_cpp_pr1(void)
+{
+};
+EXPORT_SYMBOL(__aeabi_unwind_cpp_pr1);
+
+void __aeabi_unwind_cpp_pr2(void)
+{
+};
+EXPORT_SYMBOL(__aeabi_unwind_cpp_pr2);
+
+struct unwind_ctrl_block {
+ unsigned long vrs[16]; /* virtual register set */
+ unsigned long *insn; /* pointer to the current instructions word */
+ int entries; /* number of entries left to interpret */
+ int byte; /* current byte number in the instructions word */
+};
+
+enum regs {
+ FP = 11,
+ SP = 13,
+ LR = 14,
+ PC = 15
+};
+
+extern struct unwind_idx __start_unwind_idx[];
+extern struct unwind_idx __stop_unwind_idx[];
+
+static DEFINE_SPINLOCK(unwind_lock);
+static LIST_HEAD(unwind_tables);
+
+/* Convert a prel31 symbol to an absolute address */
+#define prel31_to_addr(ptr) \
+({ \
+ /* sign-extend to 32 bits */ \
+ long offset = (((long)*(ptr)) << 1) >> 1; \
+ (unsigned long)(ptr) + offset; \
+})
+
+/*
+ * Binary search in the unwind index. The entries entries are
+ * guaranteed to be sorted in ascending order by the linker.
+ */
+static struct unwind_idx *search_index(unsigned long addr,
+ struct unwind_idx *first,
+ struct unwind_idx *last)
+{
+ pr_debug("%s(%08lx, %p, %p)\n", __func__, addr, first, last);
+
+ if (addr < first->addr) {
+ pr_warning("unwind: Unknown symbol address %08lx\n", addr);
+ return NULL;
+ } else if (addr >= last->addr)
+ return last;
+
+ while (first < last - 1) {
+ struct unwind_idx *mid = first + ((last - first + 1) >> 1);
+
+ if (addr < mid->addr)
+ last = mid;
+ else
+ first = mid;
+ }
+
+ return first;
+}
+
+static struct unwind_idx *unwind_find_idx(unsigned long addr)
+{
+ struct unwind_idx *idx = NULL;
+ unsigned long flags;
+
+ pr_debug("%s(%08lx)\n", __func__, addr);
+
+ if (core_kernel_text(addr))
+ /* main unwind table */
+ idx = search_index(addr, __start_unwind_idx,
+ __stop_unwind_idx - 1);
+ else {
+ /* module unwind tables */
+ struct unwind_table *table;
+
+ spin_lock_irqsave(&unwind_lock, flags);
+ list_for_each_entry(table, &unwind_tables, list) {
+ if (addr >= table->begin_addr &&
+ addr < table->end_addr) {
+ idx = search_index(addr, table->start,
+ table->stop - 1);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&unwind_lock, flags);
+ }
+
+ pr_debug("%s: idx = %p\n", __func__, idx);
+ return idx;
+}
+
+static unsigned long unwind_get_byte(struct unwind_ctrl_block *ctrl)
+{
+ unsigned long ret;
+
+ if (ctrl->entries <= 0) {
+ pr_warning("unwind: Corrupt unwind table\n");
+ return 0;
+ }
+
+ ret = (*ctrl->insn >> (ctrl->byte * 8)) & 0xff;
+
+ if (ctrl->byte == 0) {
+ ctrl->insn++;
+ ctrl->entries--;
+ ctrl->byte = 3;
+ } else
+ ctrl->byte--;
+
+ return ret;
+}
+
+/*
+ * Execute the current unwind instruction.
+ */
+static int unwind_exec_insn(struct unwind_ctrl_block *ctrl)
+{
+ unsigned long insn = unwind_get_byte(ctrl);
+
+ pr_debug("%s: insn = %08lx\n", __func__, insn);
+
+ if ((insn & 0xc0) == 0x00)
+ ctrl->vrs[SP] += ((insn & 0x3f) << 2) + 4;
+ else if ((insn & 0xc0) == 0x40)
+ ctrl->vrs[SP] -= ((insn & 0x3f) << 2) + 4;
+ else if ((insn & 0xf0) == 0x80) {
+ unsigned long mask;
+ unsigned long *vsp = (unsigned long *)ctrl->vrs[SP];
+ int load_sp, reg = 4;
+
+ insn = (insn << 8) | unwind_get_byte(ctrl);
+ mask = insn & 0x0fff;
+ if (mask == 0) {
+ pr_warning("unwind: 'Refuse to unwind' instruction %04lx\n",
+ insn);
+ return -URC_FAILURE;
+ }
+
+ /* pop R4-R15 according to mask */
+ load_sp = mask & (1 << (13 - 4));
+ while (mask) {
+ if (mask & 1)
+ ctrl->vrs[reg] = *vsp++;
+ mask >>= 1;
+ reg++;
+ }
+ if (!load_sp)
+ ctrl->vrs[SP] = (unsigned long)vsp;
+ } else if ((insn & 0xf0) == 0x90 &&
+ (insn & 0x0d) != 0x0d)
+ ctrl->vrs[SP] = ctrl->vrs[insn & 0x0f];
+ else if ((insn & 0xf0) == 0xa0) {
+ unsigned long *vsp = (unsigned long *)ctrl->vrs[SP];
+ int reg;
+
+ /* pop R4-R[4+bbb] */
+ for (reg = 4; reg <= 4 + (insn & 7); reg++)
+ ctrl->vrs[reg] = *vsp++;
+ if (insn & 0x80)
+ ctrl->vrs[14] = *vsp++;
+ ctrl->vrs[SP] = (unsigned long)vsp;
+ } else if (insn == 0xb0) {
+ ctrl->vrs[PC] = ctrl->vrs[LR];
+ /* no further processing */
+ ctrl->entries = 0;
+ } else if (insn == 0xb1) {
+ unsigned long mask = unwind_get_byte(ctrl);
+ unsigned long *vsp = (unsigned long *)ctrl->vrs[SP];
+ int reg = 0;
+
+ if (mask == 0 || mask & 0xf0) {
+ pr_warning("unwind: Spare encoding %04lx\n",
+ (insn << 8) | mask);
+ return -URC_FAILURE;
+ }
+
+ /* pop R0-R3 according to mask */
+ while (mask) {
+ if (mask & 1)
+ ctrl->vrs[reg] = *vsp++;
+ mask >>= 1;
+ reg++;
+ }
+ ctrl->vrs[SP] = (unsigned long)vsp;
+ } else if (insn == 0xb2) {
+ unsigned long uleb128 = unwind_get_byte(ctrl);
+
+ ctrl->vrs[SP] += 0x204 + (uleb128 << 2);
+ } else {
+ pr_warning("unwind: Unhandled instruction %02lx\n", insn);
+ return -URC_FAILURE;
+ }
+
+ pr_debug("%s: fp = %08lx sp = %08lx lr = %08lx pc = %08lx\n", __func__,
+ ctrl->vrs[FP], ctrl->vrs[SP], ctrl->vrs[LR], ctrl->vrs[PC]);
+
+ return URC_OK;
+}
+
+/*
+ * Unwind a single frame starting with *sp for the symbol at *pc. It
+ * updates the *pc and *sp with the new values.
+ */
+int unwind_frame(struct stackframe *frame)
+{
+ unsigned long high, low;
+ struct unwind_idx *idx;
+ struct unwind_ctrl_block ctrl;
+
+ /* only go to a higher address on the stack */
+ low = frame->sp;
+ high = ALIGN(low, THREAD_SIZE) + THREAD_SIZE;
+
+ pr_debug("%s(pc = %08lx lr = %08lx sp = %08lx)\n", __func__,
+ frame->pc, frame->lr, frame->sp);
+
+ if (!kernel_text_address(frame->pc))
+ return -URC_FAILURE;
+
+ idx = unwind_find_idx(frame->pc);
+ if (!idx) {
+ pr_warning("unwind: Index not found %08lx\n", frame->pc);
+ return -URC_FAILURE;
+ }
+
+ ctrl.vrs[FP] = frame->fp;
+ ctrl.vrs[SP] = frame->sp;
+ ctrl.vrs[LR] = frame->lr;
+ ctrl.vrs[PC] = 0;
+
+ if (idx->insn == 1)
+ /* can't unwind */
+ return -URC_FAILURE;
+ else if ((idx->insn & 0x80000000) == 0)
+ /* prel31 to the unwind table */
+ ctrl.insn = (unsigned long *)prel31_to_addr(&idx->insn);
+ else if ((idx->insn & 0xff000000) == 0x80000000)
+ /* only personality routine 0 supported in the index */
+ ctrl.insn = &idx->insn;
+ else {
+ pr_warning("unwind: Unsupported personality routine %08lx in the index at %p\n",
+ idx->insn, idx);
+ return -URC_FAILURE;
+ }
+
+ /* check the personality routine */
+ if ((*ctrl.insn & 0xff000000) == 0x80000000) {
+ ctrl.byte = 2;
+ ctrl.entries = 1;
+ } else if ((*ctrl.insn & 0xff000000) == 0x81000000) {
+ ctrl.byte = 1;
+ ctrl.entries = 1 + ((*ctrl.insn & 0x00ff0000) >> 16);
+ } else {
+ pr_warning("unwind: Unsupported personality routine %08lx at %p\n",
+ *ctrl.insn, ctrl.insn);
+ return -URC_FAILURE;
+ }
+
+ while (ctrl.entries > 0) {
+ int urc;
+
+ if (ctrl.vrs[SP] < low || ctrl.vrs[SP] >= high)
+ return -URC_FAILURE;
+ urc = unwind_exec_insn(&ctrl);
+ if (urc < 0)
+ return urc;
+ }
+
+ if (ctrl.vrs[PC] == 0)
+ ctrl.vrs[PC] = ctrl.vrs[LR];
+
+ frame->fp = ctrl.vrs[FP];
+ frame->sp = ctrl.vrs[SP];
+ frame->lr = ctrl.vrs[LR];
+ frame->pc = ctrl.vrs[PC];
+
+ return URC_OK;
+}
+
+void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
+{
+ struct stackframe frame;
+ unsigned long high, low;
+ register unsigned long current_sp asm ("sp");
+
+ pr_debug("%s(regs = %p tsk = %p)\n", __func__, regs, tsk);
+
+ if (!tsk)
+ tsk = current;
+
+ if (regs) {
+ frame.fp = regs->ARM_fp;
+ frame.sp = regs->ARM_sp;
+ frame.lr = regs->ARM_lr;
+ frame.pc = regs->ARM_pc;
+ } else if (tsk == current) {
+ frame.fp = (unsigned long)__builtin_frame_address(0);
+ frame.sp = current_sp;
+ frame.lr = (unsigned long)__builtin_return_address(0);
+ frame.pc = (unsigned long)unwind_backtrace;
+ } else {
+ /* task blocked in __switch_to */
+ frame.fp = thread_saved_fp(tsk);
+ frame.sp = thread_saved_sp(tsk);
+ /*
+ * The function calling __switch_to cannot be a leaf function
+ * so LR is recovered from the stack.
+ */
+ frame.lr = 0;
+ frame.pc = thread_saved_pc(tsk);
+ }
+
+ low = frame.sp & ~(THREAD_SIZE - 1);
+ high = low + THREAD_SIZE;
+
+ while (1) {
+ int urc;
+ unsigned long where = frame.pc;
+
+ urc = unwind_frame(&frame);
+ if (urc < 0)
+ break;
+ dump_backtrace_entry(where, frame.pc, frame.sp - 4);
+ }
+}
+
+struct unwind_table *unwind_table_add(unsigned long start, unsigned long size,
+ unsigned long text_addr,
+ unsigned long text_size)
+{
+ unsigned long flags;
+ struct unwind_idx *idx;
+ struct unwind_table *tab = kmalloc(sizeof(*tab), GFP_KERNEL);
+
+ pr_debug("%s(%08lx, %08lx, %08lx, %08lx)\n", __func__, start, size,
+ text_addr, text_size);
+
+ if (!tab)
+ return tab;
+
+ tab->start = (struct unwind_idx *)start;
+ tab->stop = (struct unwind_idx *)(start + size);
+ tab->begin_addr = text_addr;
+ tab->end_addr = text_addr + text_size;
+
+ /* Convert the symbol addresses to absolute values */
+ for (idx = tab->start; idx < tab->stop; idx++)
+ idx->addr = prel31_to_addr(&idx->addr);
+
+ spin_lock_irqsave(&unwind_lock, flags);
+ list_add_tail(&tab->list, &unwind_tables);
+ spin_unlock_irqrestore(&unwind_lock, flags);
+
+ return tab;
+}
+
+void unwind_table_del(struct unwind_table *tab)
+{
+ unsigned long flags;
+
+ if (!tab)
+ return;
+
+ spin_lock_irqsave(&unwind_lock, flags);
+ list_del(&tab->list);
+ spin_unlock_irqrestore(&unwind_lock, flags);
+
+ kfree(tab);
+}
+
+int __init unwind_init(void)
+{
+ struct unwind_idx *idx;
+
+ /* Convert the symbol addresses to absolute values */
+ for (idx = __start_unwind_idx; idx < __stop_unwind_idx; idx++)
+ idx->addr = prel31_to_addr(&idx->addr);
+
+ pr_debug("unwind: ARM stack unwinding initialised\n");
+
+ return 0;
+}
git.samba.org / sfrench / cifs-2.6.git / commitdiff