1331 lines
33 KiB
C
1331 lines
33 KiB
C
/*
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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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#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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extern char __start_unwind[], __end_unwind[];
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/* extern const u8 __start_unwind_hdr[], __end_unwind_hdr[];*/
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/* #define UNWIND_DEBUG */
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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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#define MAX_STACK_DEPTH 8
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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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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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#undef PTREGS_INFO
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#undef EXTRA_INFO
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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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#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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#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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typedef unsigned long uleb128_t;
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typedef signed long sleb128_t;
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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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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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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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static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 };
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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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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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return table;
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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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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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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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/* 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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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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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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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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struct eh_frame_hdr_table_entry {
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unsigned long start, fde;
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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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return (e1->start > e2->start) - (e1->start < e2->start);
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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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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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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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if (table->header)
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return;
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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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if (tableSize & (sizeof(*fde) - 1))
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return;
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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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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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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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WARN(1, "unwinder: FDE->initial_location NULL %p\n",
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(const u8 *)(fde + 1) + *fde);
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}
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++n;
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}
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if (tableSize || !n)
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return;
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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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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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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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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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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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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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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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#ifdef CONFIG_MODULES
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static struct unwind_table *last_table;
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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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if (table_size <= 0)
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return NULL;
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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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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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#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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return table;
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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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static int unlink_table(void *arg)
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{
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struct unlink_table_info *info = arg;
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struct unwind_table *table = info->table, *prev;
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for (prev = &root_table; prev->link && prev->link != table;
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prev = prev->link)
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;
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if (prev->link) {
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if (info->init_only) {
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table->init.pc = 0;
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table->init.range = 0;
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info->table = NULL;
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} else {
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prev->link = table->link;
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if (!prev->link)
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last_table = prev;
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}
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} else
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info->table = NULL;
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return 0;
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}
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/* Must be called with module_mutex held. */
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void unwind_remove_table(void *handle, int init_only)
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{
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struct unwind_table *table = handle;
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struct unlink_table_info info;
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if (!table || table == &root_table)
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return;
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if (init_only && table == last_table) {
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table->init.pc = 0;
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table->init.range = 0;
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return;
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}
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info.table = table;
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info.init_only = init_only;
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unlink_table(&info); /* XXX: SMP */
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kfree(table);
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}
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#endif /* CONFIG_MODULES */
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static uleb128_t get_uleb128(const u8 **pcur, const u8 *end)
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{
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const u8 *cur = *pcur;
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uleb128_t value;
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unsigned shift;
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for (shift = 0, value = 0; cur < end; shift += 7) {
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if (shift + 7 > 8 * sizeof(value)
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&& (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
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cur = end + 1;
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break;
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}
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value |= (uleb128_t) (*cur & 0x7f) << shift;
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if (!(*cur++ & 0x80))
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break;
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}
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*pcur = cur;
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return value;
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}
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static sleb128_t get_sleb128(const u8 **pcur, const u8 *end)
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{
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const u8 *cur = *pcur;
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sleb128_t value;
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unsigned shift;
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for (shift = 0, value = 0; cur < end; shift += 7) {
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if (shift + 7 > 8 * sizeof(value)
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&& (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
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cur = end + 1;
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break;
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}
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value |= (sleb128_t) (*cur & 0x7f) << shift;
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if (!(*cur & 0x80)) {
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value |= -(*cur++ & 0x40) << shift;
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break;
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}
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}
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*pcur = cur;
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return value;
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}
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|
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static const u32 *cie_for_fde(const u32 *fde, const struct unwind_table *table)
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{
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const u32 *cie;
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|
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if (!*fde || (*fde & (sizeof(*fde) - 1)))
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return &bad_cie;
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if (fde[1] == 0xffffffff)
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return ¬_fde; /* this is a CIE */
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|
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if ((fde[1] & (sizeof(*fde) - 1)))
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/* || fde[1] > (unsigned long)(fde + 1) - (unsigned long)table->address) */
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return NULL; /* this is not a valid FDE */
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/* cie = fde + 1 - fde[1] / sizeof(*fde); */
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cie = (u32 *) fde[1];
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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);
|