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@@ -0,0 +1,1329 @@
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+/*
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+ * Copyright (C) 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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+ * Copyright (C) 2002-2006 Novell, Inc.
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+ * Jan Beulich <jbeulich@novell.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * A simple API for unwinding kernel stacks. This is used for
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+ * debugging and error reporting purposes. The kernel doesn't need
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+ * full-blown stack unwinding with all the bells and whistles, so there
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+ * is not much point in implementing the full Dwarf2 unwind API.
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+ */
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+
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+#include <linux/sched.h>
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+#include <linux/module.h>
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+#include <linux/bootmem.h>
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+#include <linux/sort.h>
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+#include <linux/slab.h>
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+#include <linux/stop_machine.h>
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+#include <linux/uaccess.h>
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+#include <linux/ptrace.h>
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+#include <asm/sections.h>
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+#include <asm/unaligned.h>
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+#include <asm/unwind.h>
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+
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+extern char __start_unwind[], __end_unwind[];
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+/* extern const u8 __start_unwind_hdr[], __end_unwind_hdr[];*/
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+
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+/* #define UNWIND_DEBUG */
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+
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+#ifdef UNWIND_DEBUG
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+int dbg_unw;
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+#define unw_debug(fmt, ...) \
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+do { \
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+ if (dbg_unw) \
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+ pr_info(fmt, ##__VA_ARGS__); \
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+} while (0);
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+#else
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+#define unw_debug(fmt, ...)
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+#endif
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+
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+#define MAX_STACK_DEPTH 8
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+
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+#define EXTRA_INFO(f) { \
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+ BUILD_BUG_ON_ZERO(offsetof(struct unwind_frame_info, f) \
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+ % FIELD_SIZEOF(struct unwind_frame_info, f)) \
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+ + offsetof(struct unwind_frame_info, f) \
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+ / FIELD_SIZEOF(struct unwind_frame_info, f), \
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+ FIELD_SIZEOF(struct unwind_frame_info, f) \
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+ }
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+#define PTREGS_INFO(f) EXTRA_INFO(regs.f)
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+
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+static const struct {
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+ unsigned offs:BITS_PER_LONG / 2;
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+ unsigned width:BITS_PER_LONG / 2;
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+} reg_info[] = {
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+UNW_REGISTER_INFO};
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+
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+#undef PTREGS_INFO
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+#undef EXTRA_INFO
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+
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+#ifndef REG_INVALID
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+#define REG_INVALID(r) (reg_info[r].width == 0)
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+#endif
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+
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+#define DW_CFA_nop 0x00
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+#define DW_CFA_set_loc 0x01
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+#define DW_CFA_advance_loc1 0x02
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+#define DW_CFA_advance_loc2 0x03
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+#define DW_CFA_advance_loc4 0x04
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+#define DW_CFA_offset_extended 0x05
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+#define DW_CFA_restore_extended 0x06
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+#define DW_CFA_undefined 0x07
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+#define DW_CFA_same_value 0x08
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+#define DW_CFA_register 0x09
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+#define DW_CFA_remember_state 0x0a
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+#define DW_CFA_restore_state 0x0b
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+#define DW_CFA_def_cfa 0x0c
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+#define DW_CFA_def_cfa_register 0x0d
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+#define DW_CFA_def_cfa_offset 0x0e
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+#define DW_CFA_def_cfa_expression 0x0f
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+#define DW_CFA_expression 0x10
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+#define DW_CFA_offset_extended_sf 0x11
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+#define DW_CFA_def_cfa_sf 0x12
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+#define DW_CFA_def_cfa_offset_sf 0x13
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+#define DW_CFA_val_offset 0x14
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+#define DW_CFA_val_offset_sf 0x15
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+#define DW_CFA_val_expression 0x16
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+#define DW_CFA_lo_user 0x1c
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+#define DW_CFA_GNU_window_save 0x2d
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+#define DW_CFA_GNU_args_size 0x2e
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+#define DW_CFA_GNU_negative_offset_extended 0x2f
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+#define DW_CFA_hi_user 0x3f
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+
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+#define DW_EH_PE_FORM 0x07
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+#define DW_EH_PE_native 0x00
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+#define DW_EH_PE_leb128 0x01
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+#define DW_EH_PE_data2 0x02
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+#define DW_EH_PE_data4 0x03
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+#define DW_EH_PE_data8 0x04
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+#define DW_EH_PE_signed 0x08
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+#define DW_EH_PE_ADJUST 0x70
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+#define DW_EH_PE_abs 0x00
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+#define DW_EH_PE_pcrel 0x10
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+#define DW_EH_PE_textrel 0x20
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+#define DW_EH_PE_datarel 0x30
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+#define DW_EH_PE_funcrel 0x40
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+#define DW_EH_PE_aligned 0x50
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+#define DW_EH_PE_indirect 0x80
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+#define DW_EH_PE_omit 0xff
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+
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+typedef unsigned long uleb128_t;
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+typedef signed long sleb128_t;
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+
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+static struct unwind_table {
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+ struct {
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+ unsigned long pc;
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+ unsigned long range;
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+ } core, init;
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+ const void *address;
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+ unsigned long size;
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+ const unsigned char *header;
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+ unsigned long hdrsz;
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+ struct unwind_table *link;
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+ const char *name;
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+} root_table;
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+
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+struct unwind_item {
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+ enum item_location {
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+ Nowhere,
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+ Memory,
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+ Register,
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+ Value
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+ } where;
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+ uleb128_t value;
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+};
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+
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+struct unwind_state {
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+ uleb128_t loc, org;
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+ const u8 *cieStart, *cieEnd;
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+ uleb128_t codeAlign;
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+ sleb128_t dataAlign;
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+ struct cfa {
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+ uleb128_t reg, offs;
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+ } cfa;
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+ struct unwind_item regs[ARRAY_SIZE(reg_info)];
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+ unsigned stackDepth:8;
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+ unsigned version:8;
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+ const u8 *label;
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+ const u8 *stack[MAX_STACK_DEPTH];
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+};
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+
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+static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 };
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+
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+static struct unwind_table *find_table(unsigned long pc)
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+{
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+ struct unwind_table *table;
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+
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+ for (table = &root_table; table; table = table->link)
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+ if ((pc >= table->core.pc
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+ && pc < table->core.pc + table->core.range)
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+ || (pc >= table->init.pc
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+ && pc < table->init.pc + table->init.range))
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+ break;
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+
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+ return table;
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+}
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+
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+static unsigned long read_pointer(const u8 **pLoc,
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+ const void *end, signed ptrType);
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+
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+static void init_unwind_table(struct unwind_table *table, const char *name,
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+ const void *core_start, unsigned long core_size,
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+ const void *init_start, unsigned long init_size,
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+ const void *table_start, unsigned long table_size,
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+ const u8 *header_start, unsigned long header_size)
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+{
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+ const u8 *ptr = header_start + 4;
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+ const u8 *end = header_start + header_size;
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+
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+ table->core.pc = (unsigned long)core_start;
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+ table->core.range = core_size;
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+ table->init.pc = (unsigned long)init_start;
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+ table->init.range = init_size;
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+ table->address = table_start;
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+ table->size = table_size;
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+
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+ /* See if the linker provided table looks valid. */
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+ if (header_size <= 4
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+ || header_start[0] != 1
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+ || (void *)read_pointer(&ptr, end, header_start[1]) != table_start
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+ || header_start[2] == DW_EH_PE_omit
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+ || read_pointer(&ptr, end, header_start[2]) <= 0
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+ || header_start[3] == DW_EH_PE_omit)
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+ header_start = NULL;
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+
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+ table->hdrsz = header_size;
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+ smp_wmb();
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+ table->header = header_start;
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+ table->link = NULL;
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+ table->name = name;
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+}
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+
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+void __init arc_unwind_init(void)
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+{
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+ init_unwind_table(&root_table, "kernel", _text, _end - _text, NULL, 0,
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+ __start_unwind, __end_unwind - __start_unwind,
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+ NULL, 0);
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+ /*__start_unwind_hdr, __end_unwind_hdr - __start_unwind_hdr);*/
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+}
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+
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+static const u32 bad_cie, not_fde;
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+static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *);
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+static signed fde_pointer_type(const u32 *cie);
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+
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+struct eh_frame_hdr_table_entry {
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+ unsigned long start, fde;
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+};
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+
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+static int cmp_eh_frame_hdr_table_entries(const void *p1, const void *p2)
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+{
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+ const struct eh_frame_hdr_table_entry *e1 = p1;
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+ const struct eh_frame_hdr_table_entry *e2 = p2;
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+
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+ return (e1->start > e2->start) - (e1->start < e2->start);
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+}
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+
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+static void swap_eh_frame_hdr_table_entries(void *p1, void *p2, int size)
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+{
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+ struct eh_frame_hdr_table_entry *e1 = p1;
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+ struct eh_frame_hdr_table_entry *e2 = p2;
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+ unsigned long v;
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+
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+ v = e1->start;
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+ e1->start = e2->start;
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+ e2->start = v;
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+ v = e1->fde;
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+ e1->fde = e2->fde;
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+ e2->fde = v;
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+}
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+
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+static void __init setup_unwind_table(struct unwind_table *table,
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+ void *(*alloc) (unsigned long))
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+{
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+ const u8 *ptr;
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+ unsigned long tableSize = table->size, hdrSize;
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+ unsigned n;
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+ const u32 *fde;
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+ struct {
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+ u8 version;
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+ u8 eh_frame_ptr_enc;
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+ u8 fde_count_enc;
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+ u8 table_enc;
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+ unsigned long eh_frame_ptr;
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+ unsigned int fde_count;
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+ struct eh_frame_hdr_table_entry table[];
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+ } __attribute__ ((__packed__)) *header;
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+
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+ if (table->header)
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+ return;
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+
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+ if (table->hdrsz)
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+ pr_warn(".eh_frame_hdr for '%s' present but unusable\n",
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+ table->name);
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+
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+ if (tableSize & (sizeof(*fde) - 1))
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+ return;
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+
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+ for (fde = table->address, n = 0;
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+ tableSize > sizeof(*fde) && tableSize - sizeof(*fde) >= *fde;
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+ tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) {
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+ const u32 *cie = cie_for_fde(fde, table);
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+ signed ptrType;
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+
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+ if (cie == ¬_fde)
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+ continue;
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+ if (cie == NULL || cie == &bad_cie)
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+ return;
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+ ptrType = fde_pointer_type(cie);
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+ if (ptrType < 0)
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+ return;
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+
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+ ptr = (const u8 *)(fde + 2);
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+ if (!read_pointer(&ptr, (const u8 *)(fde + 1) + *fde,
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+ ptrType)) {
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+ /* FIXME_Rajesh We have 4 instances of null addresses
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+ * instead of the initial loc addr
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+ * return;
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+ */
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+ }
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+ ++n;
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+ }
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+
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+ if (tableSize || !n)
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+ return;
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+
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+ hdrSize = 4 + sizeof(unsigned long) + sizeof(unsigned int)
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+ + 2 * n * sizeof(unsigned long);
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+ header = alloc(hdrSize);
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+ if (!header)
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+ return;
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+ header->version = 1;
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+ header->eh_frame_ptr_enc = DW_EH_PE_abs | DW_EH_PE_native;
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+ header->fde_count_enc = DW_EH_PE_abs | DW_EH_PE_data4;
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+ header->table_enc = DW_EH_PE_abs | DW_EH_PE_native;
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+ put_unaligned((unsigned long)table->address, &header->eh_frame_ptr);
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+ BUILD_BUG_ON(offsetof(typeof(*header), fde_count)
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+ % __alignof(typeof(header->fde_count)));
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+ header->fde_count = n;
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+
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+ BUILD_BUG_ON(offsetof(typeof(*header), table)
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+ % __alignof(typeof(*header->table)));
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+ for (fde = table->address, tableSize = table->size, n = 0;
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+ tableSize;
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+ tableSize -= sizeof(*fde) + *fde, fde += 1 + *fde / sizeof(*fde)) {
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+ /* const u32 *cie = fde + 1 - fde[1] / sizeof(*fde); */
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+ const u32 *cie = (const u32 *)(fde[1]);
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+
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+ if (fde[1] == 0xffffffff)
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+ continue; /* this is a CIE */
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+ ptr = (const u8 *)(fde + 2);
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+ header->table[n].start = read_pointer(&ptr,
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+ (const u8 *)(fde + 1) +
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+ *fde,
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+ fde_pointer_type(cie));
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+ header->table[n].fde = (unsigned long)fde;
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+ ++n;
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+ }
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+ WARN_ON(n != header->fde_count);
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+
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+ sort(header->table,
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+ n,
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+ sizeof(*header->table),
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+ cmp_eh_frame_hdr_table_entries, swap_eh_frame_hdr_table_entries);
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+
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+ table->hdrsz = hdrSize;
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+ smp_wmb();
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+ table->header = (const void *)header;
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+}
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+
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+static void *__init balloc(unsigned long sz)
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+{
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+ return __alloc_bootmem_nopanic(sz,
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+ sizeof(unsigned int),
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+ __pa(MAX_DMA_ADDRESS));
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+}
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+
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+void __init arc_unwind_setup(void)
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+{
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+ setup_unwind_table(&root_table, balloc);
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+}
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+
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+#ifdef CONFIG_MODULES
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+
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+static struct unwind_table *last_table;
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+
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+/* Must be called with module_mutex held. */
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+void *unwind_add_table(struct module *module, const void *table_start,
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+ unsigned long table_size)
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+{
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+ struct unwind_table *table;
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+
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+ if (table_size <= 0)
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+ return NULL;
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+
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+ table = kmalloc(sizeof(*table), GFP_KERNEL);
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+ if (!table)
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+ return NULL;
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+
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+ init_unwind_table(table, module->name,
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+ module->module_core, module->core_size,
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+ module->module_init, module->init_size,
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+ table_start, table_size,
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+ NULL, 0);
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+
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+#ifdef UNWIND_DEBUG
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+ unw_debug("Table added for [%s] %lx %lx\n",
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+ module->name, table->core.pc, table->core.range);
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+#endif
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+ if (last_table)
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+ last_table->link = table;
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+ else
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+ root_table.link = table;
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+ last_table = table;
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+
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+ return table;
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+}
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+
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+struct unlink_table_info {
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+ struct unwind_table *table;
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+ int init_only;
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+};
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+
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|
+static int unlink_table(void *arg)
|
|
|
+{
|
|
|
+ struct unlink_table_info *info = arg;
|
|
|
+ struct unwind_table *table = info->table, *prev;
|
|
|
+
|
|
|
+ for (prev = &root_table; prev->link && prev->link != table;
|
|
|
+ prev = prev->link)
|
|
|
+ ;
|
|
|
+
|
|
|
+ if (prev->link) {
|
|
|
+ if (info->init_only) {
|
|
|
+ table->init.pc = 0;
|
|
|
+ table->init.range = 0;
|
|
|
+ info->table = NULL;
|
|
|
+ } else {
|
|
|
+ prev->link = table->link;
|
|
|
+ if (!prev->link)
|
|
|
+ last_table = prev;
|
|
|
+ }
|
|
|
+ } else
|
|
|
+ info->table = NULL;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/* Must be called with module_mutex held. */
|
|
|
+void unwind_remove_table(void *handle, int init_only)
|
|
|
+{
|
|
|
+ struct unwind_table *table = handle;
|
|
|
+ struct unlink_table_info info;
|
|
|
+
|
|
|
+ if (!table || table == &root_table)
|
|
|
+ return;
|
|
|
+
|
|
|
+ if (init_only && table == last_table) {
|
|
|
+ table->init.pc = 0;
|
|
|
+ table->init.range = 0;
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ info.table = table;
|
|
|
+ info.init_only = init_only;
|
|
|
+
|
|
|
+ unlink_table(&info); /* XXX: SMP */
|
|
|
+ kfree(table);
|
|
|
+}
|
|
|
+
|
|
|
+#endif /* CONFIG_MODULES */
|
|
|
+
|
|
|
+static uleb128_t get_uleb128(const u8 **pcur, const u8 *end)
|
|
|
+{
|
|
|
+ const u8 *cur = *pcur;
|
|
|
+ uleb128_t value;
|
|
|
+ unsigned shift;
|
|
|
+
|
|
|
+ for (shift = 0, value = 0; cur < end; shift += 7) {
|
|
|
+ if (shift + 7 > 8 * sizeof(value)
|
|
|
+ && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
|
|
|
+ cur = end + 1;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ value |= (uleb128_t) (*cur & 0x7f) << shift;
|
|
|
+ if (!(*cur++ & 0x80))
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ *pcur = cur;
|
|
|
+
|
|
|
+ return value;
|
|
|
+}
|
|
|
+
|
|
|
+static sleb128_t get_sleb128(const u8 **pcur, const u8 *end)
|
|
|
+{
|
|
|
+ const u8 *cur = *pcur;
|
|
|
+ sleb128_t value;
|
|
|
+ unsigned shift;
|
|
|
+
|
|
|
+ for (shift = 0, value = 0; cur < end; shift += 7) {
|
|
|
+ if (shift + 7 > 8 * sizeof(value)
|
|
|
+ && (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
|
|
|
+ cur = end + 1;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ value |= (sleb128_t) (*cur & 0x7f) << shift;
|
|
|
+ if (!(*cur & 0x80)) {
|
|
|
+ value |= -(*cur++ & 0x40) << shift;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ *pcur = cur;
|
|
|
+
|
|
|
+ return value;
|
|
|
+}
|
|
|
+
|
|
|
+static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table)
|
|
|
+{
|
|
|
+ const u32 *cie;
|
|
|
+
|
|
|
+ if (!*fde || (*fde & (sizeof(*fde) - 1)))
|
|
|
+ return &bad_cie;
|
|
|
+
|
|
|
+ if (fde[1] == 0xffffffff)
|
|
|
+ return ¬_fde; /* this is a CIE */
|
|
|
+
|
|
|
+ if ((fde[1] & (sizeof(*fde) - 1)))
|
|
|
+/* || fde[1] > (unsigned long)(fde + 1) - (unsigned long)table->address) */
|
|
|
+ return NULL; /* this is not a valid FDE */
|
|
|
+
|
|
|
+ /* cie = fde + 1 - fde[1] / sizeof(*fde); */
|
|
|
+ cie = (u32 *) fde[1];
|
|
|
+
|
|
|
+ if (*cie <= sizeof(*cie) + 4 || *cie >= fde[1] - sizeof(*fde)
|
|
|
+ || (*cie & (sizeof(*cie) - 1))
|
|
|
+ || (cie[1] != 0xffffffff))
|
|
|
+ return NULL; /* this is not a (valid) CIE */
|
|
|
+ return cie;
|
|
|
+}
|
|
|
+
|
|
|
+static unsigned long read_pointer(const u8 **pLoc, const void *end,
|
|
|
+ signed ptrType)
|
|
|
+{
|
|
|
+ unsigned long value = 0;
|
|
|
+ union {
|
|
|
+ const u8 *p8;
|
|
|
+ const u16 *p16u;
|
|
|
+ const s16 *p16s;
|
|
|
+ const u32 *p32u;
|
|
|
+ const s32 *p32s;
|
|
|
+ const unsigned long *pul;
|
|
|
+ } ptr;
|
|
|
+
|
|
|
+ if (ptrType < 0 || ptrType == DW_EH_PE_omit)
|
|
|
+ return 0;
|
|
|
+ ptr.p8 = *pLoc;
|
|
|
+ switch (ptrType & DW_EH_PE_FORM) {
|
|
|
+ case DW_EH_PE_data2:
|
|
|
+ if (end < (const void *)(ptr.p16u + 1))
|
|
|
+ return 0;
|
|
|
+ if (ptrType & DW_EH_PE_signed)
|
|
|
+ value = get_unaligned((u16 *) ptr.p16s++);
|
|
|
+ else
|
|
|
+ value = get_unaligned((u16 *) ptr.p16u++);
|
|
|
+ break;
|
|
|
+ case DW_EH_PE_data4:
|
|
|
+#ifdef CONFIG_64BIT
|
|
|
+ if (end < (const void *)(ptr.p32u + 1))
|
|
|
+ return 0;
|
|
|
+ if (ptrType & DW_EH_PE_signed)
|
|
|
+ value = get_unaligned(ptr.p32s++);
|
|
|
+ else
|
|
|
+ value = get_unaligned(ptr.p32u++);
|
|
|
+ break;
|
|
|
+ case DW_EH_PE_data8:
|
|
|
+ BUILD_BUG_ON(sizeof(u64) != sizeof(value));
|
|
|
+#else
|
|
|
+ BUILD_BUG_ON(sizeof(u32) != sizeof(value));
|
|
|
+#endif
|
|
|
+ case DW_EH_PE_native:
|
|
|
+ if (end < (const void *)(ptr.pul + 1))
|
|
|
+ return 0;
|
|
|
+ value = get_unaligned((unsigned long *)ptr.pul++);
|
|
|
+ break;
|
|
|
+ case DW_EH_PE_leb128:
|
|
|
+ BUILD_BUG_ON(sizeof(uleb128_t) > sizeof(value));
|
|
|
+ value = ptrType & DW_EH_PE_signed ? get_sleb128(&ptr.p8, end)
|
|
|
+ : get_uleb128(&ptr.p8, end);
|
|
|
+ if ((const void *)ptr.p8 > end)
|
|
|
+ return 0;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ switch (ptrType & DW_EH_PE_ADJUST) {
|
|
|
+ case DW_EH_PE_abs:
|
|
|
+ break;
|
|
|
+ case DW_EH_PE_pcrel:
|
|
|
+ value += (unsigned long)*pLoc;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ if ((ptrType & DW_EH_PE_indirect)
|
|
|
+ && __get_user(value, (unsigned long __user *)value))
|
|
|
+ return 0;
|
|
|
+ *pLoc = ptr.p8;
|
|
|
+
|
|
|
+ return value;
|
|
|
+}
|
|
|
+
|
|
|
+static signed fde_pointer_type(const u32 *cie)
|
|
|
+{
|
|
|
+ const u8 *ptr = (const u8 *)(cie + 2);
|
|
|
+ unsigned version = *ptr;
|
|
|
+
|
|
|
+ if (version != 1)
|
|
|
+ return -1; /* unsupported */
|
|
|
+
|
|
|
+ if (*++ptr) {
|
|
|
+ const char *aug;
|
|
|
+ const u8 *end = (const u8 *)(cie + 1) + *cie;
|
|
|
+ uleb128_t len;
|
|
|
+
|
|
|
+ /* check if augmentation size is first (and thus present) */
|
|
|
+ if (*ptr != 'z')
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ /* check if augmentation string is nul-terminated */
|
|
|
+ aug = (const void *)ptr;
|
|
|
+ ptr = memchr(aug, 0, end - ptr);
|
|
|
+ if (ptr == NULL)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ ++ptr; /* skip terminator */
|
|
|
+ get_uleb128(&ptr, end); /* skip code alignment */
|
|
|
+ get_sleb128(&ptr, end); /* skip data alignment */
|
|
|
+ /* skip return address column */
|
|
|
+ version <= 1 ? (void) ++ptr : (void)get_uleb128(&ptr, end);
|
|
|
+ len = get_uleb128(&ptr, end); /* augmentation length */
|
|
|
+
|
|
|
+ if (ptr + len < ptr || ptr + len > end)
|
|
|
+ return -1;
|
|
|
+
|
|
|
+ end = ptr + len;
|
|
|
+ while (*++aug) {
|
|
|
+ if (ptr >= end)
|
|
|
+ return -1;
|
|
|
+ switch (*aug) {
|
|
|
+ case 'L':
|
|
|
+ ++ptr;
|
|
|
+ break;
|
|
|
+ case 'P':{
|
|
|
+ signed ptrType = *ptr++;
|
|
|
+
|
|
|
+ if (!read_pointer(&ptr, end, ptrType)
|
|
|
+ || ptr > end)
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 'R':
|
|
|
+ return *ptr;
|
|
|
+ default:
|
|
|
+ return -1;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ return DW_EH_PE_native | DW_EH_PE_abs;
|
|
|
+}
|
|
|
+
|
|
|
+static int advance_loc(unsigned long delta, struct unwind_state *state)
|
|
|
+{
|
|
|
+ state->loc += delta * state->codeAlign;
|
|
|
+
|
|
|
+ /* FIXME_Rajesh: Probably we are defining for the initial range as well;
|
|
|
+ return delta > 0;
|
|
|
+ */
|
|
|
+ unw_debug("delta %3lu => loc 0x%lx: ", delta, state->loc);
|
|
|
+ return 1;
|
|
|
+}
|
|
|
+
|
|
|
+static void set_rule(uleb128_t reg, enum item_location where, uleb128_t value,
|
|
|
+ struct unwind_state *state)
|
|
|
+{
|
|
|
+ if (reg < ARRAY_SIZE(state->regs)) {
|
|
|
+ state->regs[reg].where = where;
|
|
|
+ state->regs[reg].value = value;
|
|
|
+
|
|
|
+#ifdef UNWIND_DEBUG
|
|
|
+ unw_debug("r%lu: ", reg);
|
|
|
+ switch (where) {
|
|
|
+ case Nowhere:
|
|
|
+ unw_debug("s ");
|
|
|
+ break;
|
|
|
+ case Memory:
|
|
|
+ unw_debug("c(%lu) ", value);
|
|
|
+ break;
|
|
|
+ case Register:
|
|
|
+ unw_debug("r(%lu) ", value);
|
|
|
+ break;
|
|
|
+ case Value:
|
|
|
+ unw_debug("v(%lu) ", value);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+#endif
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static int processCFI(const u8 *start, const u8 *end, unsigned long targetLoc,
|
|
|
+ signed ptrType, struct unwind_state *state)
|
|
|
+{
|
|
|
+ union {
|
|
|
+ const u8 *p8;
|
|
|
+ const u16 *p16;
|
|
|
+ const u32 *p32;
|
|
|
+ } ptr;
|
|
|
+ int result = 1;
|
|
|
+ u8 opcode;
|
|
|
+
|
|
|
+ if (start != state->cieStart) {
|
|
|
+ state->loc = state->org;
|
|
|
+ result =
|
|
|
+ processCFI(state->cieStart, state->cieEnd, 0, ptrType,
|
|
|
+ state);
|
|
|
+ if (targetLoc == 0 && state->label == NULL)
|
|
|
+ return result;
|
|
|
+ }
|
|
|
+ for (ptr.p8 = start; result && ptr.p8 < end;) {
|
|
|
+ switch (*ptr.p8 >> 6) {
|
|
|
+ uleb128_t value;
|
|
|
+
|
|
|
+ case 0:
|
|
|
+ opcode = *ptr.p8++;
|
|
|
+
|
|
|
+ switch (opcode) {
|
|
|
+ case DW_CFA_nop:
|
|
|
+ unw_debug("cfa nop ");
|
|
|
+ break;
|
|
|
+ case DW_CFA_set_loc:
|
|
|
+ state->loc = read_pointer(&ptr.p8, end,
|
|
|
+ ptrType);
|
|
|
+ if (state->loc == 0)
|
|
|
+ result = 0;
|
|
|
+ unw_debug("cfa_set_loc: 0x%lx ", state->loc);
|
|
|
+ break;
|
|
|
+ case DW_CFA_advance_loc1:
|
|
|
+ unw_debug("\ncfa advance loc1:");
|
|
|
+ result = ptr.p8 < end
|
|
|
+ && advance_loc(*ptr.p8++, state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_advance_loc2:
|
|
|
+ value = *ptr.p8++;
|
|
|
+ value += *ptr.p8++ << 8;
|
|
|
+ unw_debug("\ncfa advance loc2:");
|
|
|
+ result = ptr.p8 <= end + 2
|
|
|
+ /* && advance_loc(*ptr.p16++, state); */
|
|
|
+ && advance_loc(value, state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_advance_loc4:
|
|
|
+ unw_debug("\ncfa advance loc4:");
|
|
|
+ result = ptr.p8 <= end + 4
|
|
|
+ && advance_loc(*ptr.p32++, state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_offset_extended:
|
|
|
+ value = get_uleb128(&ptr.p8, end);
|
|
|
+ unw_debug("cfa_offset_extended: ");
|
|
|
+ set_rule(value, Memory,
|
|
|
+ get_uleb128(&ptr.p8, end), state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_val_offset:
|
|
|
+ value = get_uleb128(&ptr.p8, end);
|
|
|
+ set_rule(value, Value,
|
|
|
+ get_uleb128(&ptr.p8, end), state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_offset_extended_sf:
|
|
|
+ value = get_uleb128(&ptr.p8, end);
|
|
|
+ set_rule(value, Memory,
|
|
|
+ get_sleb128(&ptr.p8, end), state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_val_offset_sf:
|
|
|
+ value = get_uleb128(&ptr.p8, end);
|
|
|
+ set_rule(value, Value,
|
|
|
+ get_sleb128(&ptr.p8, end), state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_restore_extended:
|
|
|
+ unw_debug("cfa_restore_extended: ");
|
|
|
+ case DW_CFA_undefined:
|
|
|
+ unw_debug("cfa_undefined: ");
|
|
|
+ case DW_CFA_same_value:
|
|
|
+ unw_debug("cfa_same_value: ");
|
|
|
+ set_rule(get_uleb128(&ptr.p8, end), Nowhere, 0,
|
|
|
+ state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_register:
|
|
|
+ unw_debug("cfa_register: ");
|
|
|
+ value = get_uleb128(&ptr.p8, end);
|
|
|
+ set_rule(value,
|
|
|
+ Register,
|
|
|
+ get_uleb128(&ptr.p8, end), state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_remember_state:
|
|
|
+ unw_debug("cfa_remember_state: ");
|
|
|
+ if (ptr.p8 == state->label) {
|
|
|
+ state->label = NULL;
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+ if (state->stackDepth >= MAX_STACK_DEPTH)
|
|
|
+ return 0;
|
|
|
+ state->stack[state->stackDepth++] = ptr.p8;
|
|
|
+ break;
|
|
|
+ case DW_CFA_restore_state:
|
|
|
+ unw_debug("cfa_restore_state: ");
|
|
|
+ if (state->stackDepth) {
|
|
|
+ const uleb128_t loc = state->loc;
|
|
|
+ const u8 *label = state->label;
|
|
|
+
|
|
|
+ state->label =
|
|
|
+ state->stack[state->stackDepth - 1];
|
|
|
+ memcpy(&state->cfa, &badCFA,
|
|
|
+ sizeof(state->cfa));
|
|
|
+ memset(state->regs, 0,
|
|
|
+ sizeof(state->regs));
|
|
|
+ state->stackDepth = 0;
|
|
|
+ result =
|
|
|
+ processCFI(start, end, 0, ptrType,
|
|
|
+ state);
|
|
|
+ state->loc = loc;
|
|
|
+ state->label = label;
|
|
|
+ } else
|
|
|
+ return 0;
|
|
|
+ break;
|
|
|
+ case DW_CFA_def_cfa:
|
|
|
+ state->cfa.reg = get_uleb128(&ptr.p8, end);
|
|
|
+ unw_debug("cfa_def_cfa: r%lu ", state->cfa.reg);
|
|
|
+ /*nobreak*/
|
|
|
+ case DW_CFA_def_cfa_offset:
|
|
|
+ state->cfa.offs = get_uleb128(&ptr.p8, end);
|
|
|
+ unw_debug("cfa_def_cfa_offset: 0x%lx ",
|
|
|
+ state->cfa.offs);
|
|
|
+ break;
|
|
|
+ case DW_CFA_def_cfa_sf:
|
|
|
+ state->cfa.reg = get_uleb128(&ptr.p8, end);
|
|
|
+ /*nobreak */
|
|
|
+ case DW_CFA_def_cfa_offset_sf:
|
|
|
+ state->cfa.offs = get_sleb128(&ptr.p8, end)
|
|
|
+ * state->dataAlign;
|
|
|
+ break;
|
|
|
+ case DW_CFA_def_cfa_register:
|
|
|
+ unw_debug("cfa_def_cfa_regsiter: ");
|
|
|
+ state->cfa.reg = get_uleb128(&ptr.p8, end);
|
|
|
+ break;
|
|
|
+ /*todo case DW_CFA_def_cfa_expression: */
|
|
|
+ /*todo case DW_CFA_expression: */
|
|
|
+ /*todo case DW_CFA_val_expression: */
|
|
|
+ case DW_CFA_GNU_args_size:
|
|
|
+ get_uleb128(&ptr.p8, end);
|
|
|
+ break;
|
|
|
+ case DW_CFA_GNU_negative_offset_extended:
|
|
|
+ value = get_uleb128(&ptr.p8, end);
|
|
|
+ set_rule(value,
|
|
|
+ Memory,
|
|
|
+ (uleb128_t) 0 - get_uleb128(&ptr.p8,
|
|
|
+ end),
|
|
|
+ state);
|
|
|
+ break;
|
|
|
+ case DW_CFA_GNU_window_save:
|
|
|
+ default:
|
|
|
+ unw_debug("UNKNOW OPCODE 0x%x\n", opcode);
|
|
|
+ result = 0;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case 1:
|
|
|
+ unw_debug("\ncfa_adv_loc: ");
|
|
|
+ result = advance_loc(*ptr.p8++ & 0x3f, state);
|
|
|
+ break;
|
|
|
+ case 2:
|
|
|
+ unw_debug("cfa_offset: ");
|
|
|
+ value = *ptr.p8++ & 0x3f;
|
|
|
+ set_rule(value, Memory, get_uleb128(&ptr.p8, end),
|
|
|
+ state);
|
|
|
+ break;
|
|
|
+ case 3:
|
|
|
+ unw_debug("cfa_restore: ");
|
|
|
+ set_rule(*ptr.p8++ & 0x3f, Nowhere, 0, state);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (ptr.p8 > end)
|
|
|
+ result = 0;
|
|
|
+ if (result && targetLoc != 0 && targetLoc < state->loc)
|
|
|
+ return 1;
|
|
|
+ }
|
|
|
+
|
|
|
+ return result && ptr.p8 == end && (targetLoc == 0 || (
|
|
|
+ /*todo While in theory this should apply, gcc in practice omits
|
|
|
+ everything past the function prolog, and hence the location
|
|
|
+ never reaches the end of the function.
|
|
|
+ targetLoc < state->loc && */ state->label == NULL));
|
|
|
+}
|
|
|
+
|
|
|
+/* Unwind to previous to frame. Returns 0 if successful, negative
|
|
|
+ * number in case of an error. */
|
|
|
+int arc_unwind(struct unwind_frame_info *frame)
|
|
|
+{
|
|
|
+#define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs])
|
|
|
+ const u32 *fde = NULL, *cie = NULL;
|
|
|
+ const u8 *ptr = NULL, *end = NULL;
|
|
|
+ unsigned long pc = UNW_PC(frame) - frame->call_frame;
|
|
|
+ unsigned long startLoc = 0, endLoc = 0, cfa;
|
|
|
+ unsigned i;
|
|
|
+ signed ptrType = -1;
|
|
|
+ uleb128_t retAddrReg = 0;
|
|
|
+ const struct unwind_table *table;
|
|
|
+ struct unwind_state state;
|
|
|
+ unsigned long *fptr;
|
|
|
+ unsigned long addr;
|
|
|
+
|
|
|
+ unw_debug("\n\nUNWIND FRAME:\n");
|
|
|
+ unw_debug("PC: 0x%lx BLINK: 0x%lx, SP: 0x%lx, FP: 0x%x\n",
|
|
|
+ UNW_PC(frame), UNW_BLINK(frame), UNW_SP(frame),
|
|
|
+ UNW_FP(frame));
|
|
|
+
|
|
|
+ if (UNW_PC(frame) == 0)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+#ifdef UNWIND_DEBUG
|
|
|
+ {
|
|
|
+ unsigned long *sptr = (unsigned long *)UNW_SP(frame);
|
|
|
+ unw_debug("\nStack Dump:\n");
|
|
|
+ for (i = 0; i < 20; i++, sptr++)
|
|
|
+ unw_debug("0x%p: 0x%lx\n", sptr, *sptr);
|
|
|
+ unw_debug("\n");
|
|
|
+ }
|
|
|
+#endif
|
|
|
+
|
|
|
+ table = find_table(pc);
|
|
|
+ if (table != NULL
|
|
|
+ && !(table->size & (sizeof(*fde) - 1))) {
|
|
|
+ const u8 *hdr = table->header;
|
|
|
+ unsigned long tableSize;
|
|
|
+
|
|
|
+ smp_rmb();
|
|
|
+ if (hdr && hdr[0] == 1) {
|
|
|
+ switch (hdr[3] & DW_EH_PE_FORM) {
|
|
|
+ case DW_EH_PE_native:
|
|
|
+ tableSize = sizeof(unsigned long);
|
|
|
+ break;
|
|
|
+ case DW_EH_PE_data2:
|
|
|
+ tableSize = 2;
|
|
|
+ break;
|
|
|
+ case DW_EH_PE_data4:
|
|
|
+ tableSize = 4;
|
|
|
+ break;
|
|
|
+ case DW_EH_PE_data8:
|
|
|
+ tableSize = 8;
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ tableSize = 0;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ ptr = hdr + 4;
|
|
|
+ end = hdr + table->hdrsz;
|
|
|
+ if (tableSize && read_pointer(&ptr, end, hdr[1])
|
|
|
+ == (unsigned long)table->address
|
|
|
+ && (i = read_pointer(&ptr, end, hdr[2])) > 0
|
|
|
+ && i == (end - ptr) / (2 * tableSize)
|
|
|
+ && !((end - ptr) % (2 * tableSize))) {
|
|
|
+ do {
|
|
|
+ const u8 *cur =
|
|
|
+ ptr + (i / 2) * (2 * tableSize);
|
|
|
+
|
|
|
+ startLoc = read_pointer(&cur,
|
|
|
+ cur + tableSize,
|
|
|
+ hdr[3]);
|
|
|
+ if (pc < startLoc)
|
|
|
+ i /= 2;
|
|
|
+ else {
|
|
|
+ ptr = cur - tableSize;
|
|
|
+ i = (i + 1) / 2;
|
|
|
+ }
|
|
|
+ } while (startLoc && i > 1);
|
|
|
+ if (i == 1
|
|
|
+ && (startLoc = read_pointer(&ptr,
|
|
|
+ ptr + tableSize,
|
|
|
+ hdr[3])) != 0
|
|
|
+ && pc >= startLoc)
|
|
|
+ fde = (void *)read_pointer(&ptr,
|
|
|
+ ptr +
|
|
|
+ tableSize,
|
|
|
+ hdr[3]);
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ if (fde != NULL) {
|
|
|
+ cie = cie_for_fde(fde, table);
|
|
|
+ ptr = (const u8 *)(fde + 2);
|
|
|
+ if (cie != NULL
|
|
|
+ && cie != &bad_cie
|
|
|
+ && cie != ¬_fde
|
|
|
+ && (ptrType = fde_pointer_type(cie)) >= 0
|
|
|
+ && read_pointer(&ptr,
|
|
|
+ (const u8 *)(fde + 1) + *fde,
|
|
|
+ ptrType) == startLoc) {
|
|
|
+ if (!(ptrType & DW_EH_PE_indirect))
|
|
|
+ ptrType &=
|
|
|
+ DW_EH_PE_FORM | DW_EH_PE_signed;
|
|
|
+ endLoc =
|
|
|
+ startLoc + read_pointer(&ptr,
|
|
|
+ (const u8 *)(fde +
|
|
|
+ 1) +
|
|
|
+ *fde, ptrType);
|
|
|
+ if (pc >= endLoc)
|
|
|
+ fde = NULL;
|
|
|
+ } else
|
|
|
+ fde = NULL;
|
|
|
+ }
|
|
|
+ if (fde == NULL) {
|
|
|
+ for (fde = table->address, tableSize = table->size;
|
|
|
+ cie = NULL, tableSize > sizeof(*fde)
|
|
|
+ && tableSize - sizeof(*fde) >= *fde;
|
|
|
+ tableSize -= sizeof(*fde) + *fde,
|
|
|
+ fde += 1 + *fde / sizeof(*fde)) {
|
|
|
+ cie = cie_for_fde(fde, table);
|
|
|
+ if (cie == &bad_cie) {
|
|
|
+ cie = NULL;
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ if (cie == NULL
|
|
|
+ || cie == ¬_fde
|
|
|
+ || (ptrType = fde_pointer_type(cie)) < 0)
|
|
|
+ continue;
|
|
|
+ ptr = (const u8 *)(fde + 2);
|
|
|
+ startLoc = read_pointer(&ptr,
|
|
|
+ (const u8 *)(fde + 1) +
|
|
|
+ *fde, ptrType);
|
|
|
+ if (!startLoc)
|
|
|
+ continue;
|
|
|
+ if (!(ptrType & DW_EH_PE_indirect))
|
|
|
+ ptrType &=
|
|
|
+ DW_EH_PE_FORM | DW_EH_PE_signed;
|
|
|
+ endLoc =
|
|
|
+ startLoc + read_pointer(&ptr,
|
|
|
+ (const u8 *)(fde +
|
|
|
+ 1) +
|
|
|
+ *fde, ptrType);
|
|
|
+ if (pc >= startLoc && pc < endLoc)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (cie != NULL) {
|
|
|
+ memset(&state, 0, sizeof(state));
|
|
|
+ state.cieEnd = ptr; /* keep here temporarily */
|
|
|
+ ptr = (const u8 *)(cie + 2);
|
|
|
+ end = (const u8 *)(cie + 1) + *cie;
|
|
|
+ frame->call_frame = 1;
|
|
|
+ if ((state.version = *ptr) != 1)
|
|
|
+ cie = NULL; /* unsupported version */
|
|
|
+ else if (*++ptr) {
|
|
|
+ /* check if augmentation size is first (thus present) */
|
|
|
+ if (*ptr == 'z') {
|
|
|
+ while (++ptr < end && *ptr) {
|
|
|
+ switch (*ptr) {
|
|
|
+ /* chk for ignorable or already handled
|
|
|
+ * nul-terminated augmentation string */
|
|
|
+ case 'L':
|
|
|
+ case 'P':
|
|
|
+ case 'R':
|
|
|
+ continue;
|
|
|
+ case 'S':
|
|
|
+ frame->call_frame = 0;
|
|
|
+ continue;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (ptr >= end || *ptr)
|
|
|
+ cie = NULL;
|
|
|
+ }
|
|
|
+ ++ptr;
|
|
|
+ }
|
|
|
+ if (cie != NULL) {
|
|
|
+ /* get code aligment factor */
|
|
|
+ state.codeAlign = get_uleb128(&ptr, end);
|
|
|
+ /* get data aligment factor */
|
|
|
+ state.dataAlign = get_sleb128(&ptr, end);
|
|
|
+ if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end)
|
|
|
+ cie = NULL;
|
|
|
+ else {
|
|
|
+ retAddrReg =
|
|
|
+ state.version <= 1 ? *ptr++ : get_uleb128(&ptr,
|
|
|
+ end);
|
|
|
+ unw_debug("CIE Frame Info:\n");
|
|
|
+ unw_debug("return Address register 0x%lx\n",
|
|
|
+ retAddrReg);
|
|
|
+ unw_debug("data Align: %ld\n", state.dataAlign);
|
|
|
+ unw_debug("code Align: %lu\n", state.codeAlign);
|
|
|
+ /* skip augmentation */
|
|
|
+ if (((const char *)(cie + 2))[1] == 'z') {
|
|
|
+ uleb128_t augSize = get_uleb128(&ptr, end);
|
|
|
+
|
|
|
+ ptr += augSize;
|
|
|
+ }
|
|
|
+ if (ptr > end || retAddrReg >= ARRAY_SIZE(reg_info)
|
|
|
+ || REG_INVALID(retAddrReg)
|
|
|
+ || reg_info[retAddrReg].width !=
|
|
|
+ sizeof(unsigned long))
|
|
|
+ cie = NULL;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (cie != NULL) {
|
|
|
+ state.cieStart = ptr;
|
|
|
+ ptr = state.cieEnd;
|
|
|
+ state.cieEnd = end;
|
|
|
+ end = (const u8 *)(fde + 1) + *fde;
|
|
|
+ /* skip augmentation */
|
|
|
+ if (((const char *)(cie + 2))[1] == 'z') {
|
|
|
+ uleb128_t augSize = get_uleb128(&ptr, end);
|
|
|
+
|
|
|
+ if ((ptr += augSize) > end)
|
|
|
+ fde = NULL;
|
|
|
+ }
|
|
|
+ }
|
|
|
+ if (cie == NULL || fde == NULL) {
|
|
|
+#ifdef CONFIG_FRAME_POINTER
|
|
|
+ unsigned long top, bottom;
|
|
|
+
|
|
|
+ top = STACK_TOP_UNW(frame->task);
|
|
|
+ bottom = STACK_BOTTOM_UNW(frame->task);
|
|
|
+#if FRAME_RETADDR_OFFSET < 0
|
|
|
+ if (UNW_SP(frame) < top && UNW_FP(frame) <= UNW_SP(frame)
|
|
|
+ && bottom < UNW_FP(frame)
|
|
|
+#else
|
|
|
+ if (UNW_SP(frame) > top && UNW_FP(frame) >= UNW_SP(frame)
|
|
|
+ && bottom > UNW_FP(frame)
|
|
|
+#endif
|
|
|
+ && !((UNW_SP(frame) | UNW_FP(frame))
|
|
|
+ & (sizeof(unsigned long) - 1))) {
|
|
|
+ unsigned long link;
|
|
|
+
|
|
|
+ if (!__get_user(link, (unsigned long *)
|
|
|
+ (UNW_FP(frame) + FRAME_LINK_OFFSET))
|
|
|
+#if FRAME_RETADDR_OFFSET < 0
|
|
|
+ && link > bottom && link < UNW_FP(frame)
|
|
|
+#else
|
|
|
+ && link > UNW_FP(frame) && link < bottom
|
|
|
+#endif
|
|
|
+ && !(link & (sizeof(link) - 1))
|
|
|
+ && !__get_user(UNW_PC(frame),
|
|
|
+ (unsigned long *)(UNW_FP(frame)
|
|
|
+ + FRAME_RETADDR_OFFSET)))
|
|
|
+ {
|
|
|
+ UNW_SP(frame) =
|
|
|
+ UNW_FP(frame) + FRAME_RETADDR_OFFSET
|
|
|
+#if FRAME_RETADDR_OFFSET < 0
|
|
|
+ -
|
|
|
+#else
|
|
|
+ +
|
|
|
+#endif
|
|
|
+ sizeof(UNW_PC(frame));
|
|
|
+ UNW_FP(frame) = link;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ }
|
|
|
+#endif
|
|
|
+ return -ENXIO;
|
|
|
+ }
|
|
|
+ state.org = startLoc;
|
|
|
+ memcpy(&state.cfa, &badCFA, sizeof(state.cfa));
|
|
|
+
|
|
|
+ unw_debug("\nProcess instructions\n");
|
|
|
+
|
|
|
+ /* process instructions
|
|
|
+ * For ARC, we optimize by having blink(retAddrReg) with
|
|
|
+ * the sameValue in the leaf function, so we should not check
|
|
|
+ * state.regs[retAddrReg].where == Nowhere
|
|
|
+ */
|
|
|
+ if (!processCFI(ptr, end, pc, ptrType, &state)
|
|
|
+ || state.loc > endLoc
|
|
|
+/* || state.regs[retAddrReg].where == Nowhere */
|
|
|
+ || state.cfa.reg >= ARRAY_SIZE(reg_info)
|
|
|
+ || reg_info[state.cfa.reg].width != sizeof(unsigned long)
|
|
|
+ || state.cfa.offs % sizeof(unsigned long))
|
|
|
+ return -EIO;
|
|
|
+
|
|
|
+#ifdef UNWIND_DEBUG
|
|
|
+ unw_debug("\n");
|
|
|
+
|
|
|
+ unw_debug("\nRegister State Based on the rules parsed from FDE:\n");
|
|
|
+ for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
|
|
|
+
|
|
|
+ if (REG_INVALID(i))
|
|
|
+ continue;
|
|
|
+
|
|
|
+ switch (state.regs[i].where) {
|
|
|
+ case Nowhere:
|
|
|
+ break;
|
|
|
+ case Memory:
|
|
|
+ unw_debug(" r%d: c(%lu),", i, state.regs[i].value);
|
|
|
+ break;
|
|
|
+ case Register:
|
|
|
+ unw_debug(" r%d: r(%lu),", i, state.regs[i].value);
|
|
|
+ break;
|
|
|
+ case Value:
|
|
|
+ unw_debug(" r%d: v(%lu),", i, state.regs[i].value);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ unw_debug("\n");
|
|
|
+#endif
|
|
|
+
|
|
|
+ /* update frame */
|
|
|
+#ifndef CONFIG_AS_CFI_SIGNAL_FRAME
|
|
|
+ if (frame->call_frame
|
|
|
+ && !UNW_DEFAULT_RA(state.regs[retAddrReg], state.dataAlign))
|
|
|
+ frame->call_frame = 0;
|
|
|
+#endif
|
|
|
+ cfa = FRAME_REG(state.cfa.reg, unsigned long) + state.cfa.offs;
|
|
|
+ startLoc = min_t(unsigned long, UNW_SP(frame), cfa);
|
|
|
+ endLoc = max_t(unsigned long, UNW_SP(frame), cfa);
|
|
|
+ if (STACK_LIMIT(startLoc) != STACK_LIMIT(endLoc)) {
|
|
|
+ startLoc = min(STACK_LIMIT(cfa), cfa);
|
|
|
+ endLoc = max(STACK_LIMIT(cfa), cfa);
|
|
|
+ }
|
|
|
+
|
|
|
+ unw_debug("\nCFA reg: 0x%lx, offset: 0x%lx => 0x%lx\n",
|
|
|
+ state.cfa.reg, state.cfa.offs, cfa);
|
|
|
+
|
|
|
+ for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
|
|
|
+ if (REG_INVALID(i)) {
|
|
|
+ if (state.regs[i].where == Nowhere)
|
|
|
+ continue;
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+ switch (state.regs[i].where) {
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ case Register:
|
|
|
+ if (state.regs[i].value >= ARRAY_SIZE(reg_info)
|
|
|
+ || REG_INVALID(state.regs[i].value)
|
|
|
+ || reg_info[i].width >
|
|
|
+ reg_info[state.regs[i].value].width)
|
|
|
+ return -EIO;
|
|
|
+ switch (reg_info[state.regs[i].value].width) {
|
|
|
+ case sizeof(u8):
|
|
|
+ state.regs[i].value =
|
|
|
+ FRAME_REG(state.regs[i].value, const u8);
|
|
|
+ break;
|
|
|
+ case sizeof(u16):
|
|
|
+ state.regs[i].value =
|
|
|
+ FRAME_REG(state.regs[i].value, const u16);
|
|
|
+ break;
|
|
|
+ case sizeof(u32):
|
|
|
+ state.regs[i].value =
|
|
|
+ FRAME_REG(state.regs[i].value, const u32);
|
|
|
+ break;
|
|
|
+#ifdef CONFIG_64BIT
|
|
|
+ case sizeof(u64):
|
|
|
+ state.regs[i].value =
|
|
|
+ FRAME_REG(state.regs[i].value, const u64);
|
|
|
+ break;
|
|
|
+#endif
|
|
|
+ default:
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ unw_debug("\nRegister state after evaluation with realtime Stack:\n");
|
|
|
+ fptr = (unsigned long *)(&frame->regs);
|
|
|
+ for (i = 0; i < ARRAY_SIZE(state.regs); ++i, fptr++) {
|
|
|
+
|
|
|
+ if (REG_INVALID(i))
|
|
|
+ continue;
|
|
|
+ switch (state.regs[i].where) {
|
|
|
+ case Nowhere:
|
|
|
+ if (reg_info[i].width != sizeof(UNW_SP(frame))
|
|
|
+ || &FRAME_REG(i, __typeof__(UNW_SP(frame)))
|
|
|
+ != &UNW_SP(frame))
|
|
|
+ continue;
|
|
|
+ UNW_SP(frame) = cfa;
|
|
|
+ break;
|
|
|
+ case Register:
|
|
|
+ switch (reg_info[i].width) {
|
|
|
+ case sizeof(u8):
|
|
|
+ FRAME_REG(i, u8) = state.regs[i].value;
|
|
|
+ break;
|
|
|
+ case sizeof(u16):
|
|
|
+ FRAME_REG(i, u16) = state.regs[i].value;
|
|
|
+ break;
|
|
|
+ case sizeof(u32):
|
|
|
+ FRAME_REG(i, u32) = state.regs[i].value;
|
|
|
+ break;
|
|
|
+#ifdef CONFIG_64BIT
|
|
|
+ case sizeof(u64):
|
|
|
+ FRAME_REG(i, u64) = state.regs[i].value;
|
|
|
+ break;
|
|
|
+#endif
|
|
|
+ default:
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ case Value:
|
|
|
+ if (reg_info[i].width != sizeof(unsigned long))
|
|
|
+ return -EIO;
|
|
|
+ FRAME_REG(i, unsigned long) = cfa + state.regs[i].value
|
|
|
+ * state.dataAlign;
|
|
|
+ break;
|
|
|
+ case Memory:
|
|
|
+ addr = cfa + state.regs[i].value * state.dataAlign;
|
|
|
+
|
|
|
+ if ((state.regs[i].value * state.dataAlign)
|
|
|
+ % sizeof(unsigned long)
|
|
|
+ || addr < startLoc
|
|
|
+ || addr + sizeof(unsigned long) < addr
|
|
|
+ || addr + sizeof(unsigned long) > endLoc)
|
|
|
+ return -EIO;
|
|
|
+
|
|
|
+ switch (reg_info[i].width) {
|
|
|
+ case sizeof(u8):
|
|
|
+ __get_user(FRAME_REG(i, u8),
|
|
|
+ (u8 __user *)addr);
|
|
|
+ break;
|
|
|
+ case sizeof(u16):
|
|
|
+ __get_user(FRAME_REG(i, u16),
|
|
|
+ (u16 __user *)addr);
|
|
|
+ break;
|
|
|
+ case sizeof(u32):
|
|
|
+ __get_user(FRAME_REG(i, u32),
|
|
|
+ (u32 __user *)addr);
|
|
|
+ break;
|
|
|
+#ifdef CONFIG_64BIT
|
|
|
+ case sizeof(u64):
|
|
|
+ __get_user(FRAME_REG(i, u64),
|
|
|
+ (u64 __user *)addr);
|
|
|
+ break;
|
|
|
+#endif
|
|
|
+ default:
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+
|
|
|
+ break;
|
|
|
+ }
|
|
|
+ unw_debug("r%d: 0x%lx ", i, *fptr);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+#undef FRAME_REG
|
|
|
+}
|
|
|
+EXPORT_SYMBOL(arc_unwind);
|
Vineet Gupta