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1307 lines
32 KiB
C
1307 lines
32 KiB
C
/* DWARF2 exception handling and frame unwind runtime interface routines.
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Copyright (C) 1997-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef _LIBC
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#include <stdlib.h>
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#include <string.h>
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#include <error.h>
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#include <libintl.h>
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#include <dwarf2.h>
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#include <stdio.h>
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#include <unwind.h>
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#include <unwind-pe.h>
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#include <unwind-dw2-fde.h>
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#else
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#include "tconfig.h"
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#include "tsystem.h"
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#include "dwarf2.h"
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#include "unwind.h"
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#include "unwind-pe.h"
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#include "unwind-dw2-fde.h"
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#include "gthr.h"
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#endif
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#ifndef STACK_GROWS_DOWNWARD
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#define STACK_GROWS_DOWNWARD 0
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#else
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#undef STACK_GROWS_DOWNWARD
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#define STACK_GROWS_DOWNWARD 1
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#endif
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/* A target can override (perhaps for backward compatibility) how
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many dwarf2 columns are unwound. */
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#ifndef DWARF_FRAME_REGISTERS
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#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
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#endif
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/* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */
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#ifndef PRE_GCC3_DWARF_FRAME_REGISTERS
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#define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS
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#endif
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/* This is the register and unwind state for a particular frame. This
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provides the information necessary to unwind up past a frame and return
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to its caller. */
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struct _Unwind_Context
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{
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void *reg[DWARF_FRAME_REGISTERS+1];
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void *cfa;
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void *ra;
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void *lsda;
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struct dwarf_eh_bases bases;
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_Unwind_Word args_size;
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};
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#ifndef _LIBC
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/* Byte size of every register managed by these routines. */
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static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS];
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#endif
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/* The result of interpreting the frame unwind info for a frame.
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This is all symbolic at this point, as none of the values can
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be resolved until the target pc is located. */
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typedef struct
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{
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/* Each register save state can be described in terms of a CFA slot,
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another register, or a location expression. */
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struct frame_state_reg_info
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{
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struct {
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union {
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_Unwind_Word reg;
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_Unwind_Sword offset;
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const unsigned char *exp;
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} loc;
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enum {
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REG_UNSAVED,
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REG_SAVED_OFFSET,
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REG_SAVED_REG,
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REG_SAVED_EXP,
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} how;
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} reg[DWARF_FRAME_REGISTERS+1];
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/* Used to implement DW_CFA_remember_state. */
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struct frame_state_reg_info *prev;
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} regs;
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/* The CFA can be described in terms of a reg+offset or a
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location expression. */
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_Unwind_Sword cfa_offset;
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_Unwind_Word cfa_reg;
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const unsigned char *cfa_exp;
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enum {
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CFA_UNSET,
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CFA_REG_OFFSET,
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CFA_EXP,
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} cfa_how;
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/* The PC described by the current frame state. */
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void *pc;
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/* The information we care about from the CIE/FDE. */
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_Unwind_Personality_Fn personality;
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_Unwind_Sword data_align;
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_Unwind_Word code_align;
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unsigned char retaddr_column;
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unsigned char fde_encoding;
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unsigned char lsda_encoding;
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unsigned char saw_z;
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void *eh_ptr;
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} _Unwind_FrameState;
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/* Read unaligned data from the instruction buffer. */
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union unaligned
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{
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void *p;
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unsigned u2 __attribute__ ((mode (HI)));
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unsigned u4 __attribute__ ((mode (SI)));
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unsigned u8 __attribute__ ((mode (DI)));
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signed s2 __attribute__ ((mode (HI)));
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signed s4 __attribute__ ((mode (SI)));
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signed s8 __attribute__ ((mode (DI)));
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} __attribute__ ((packed));
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static inline void *
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read_pointer (const void *p) { const union unaligned *up = p; return up->p; }
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static inline int
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read_1u (const void *p) { return *(const unsigned char *) p; }
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static inline int
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read_1s (const void *p) { return *(const signed char *) p; }
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static inline int
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read_2u (const void *p) { const union unaligned *up = p; return up->u2; }
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static inline int
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read_2s (const void *p) { const union unaligned *up = p; return up->s2; }
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static inline unsigned int
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read_4u (const void *p) { const union unaligned *up = p; return up->u4; }
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static inline int
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read_4s (const void *p) { const union unaligned *up = p; return up->s4; }
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static inline unsigned long
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read_8u (const void *p) { const union unaligned *up = p; return up->u8; }
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static inline unsigned long
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read_8s (const void *p) { const union unaligned *up = p; return up->s8; }
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/* Get the value of register REG as saved in CONTEXT. */
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inline _Unwind_Word
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_Unwind_GetGR (struct _Unwind_Context *context, int index)
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{
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/* This will segfault if the register hasn't been saved. */
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return * (_Unwind_Word *) context->reg[index];
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}
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/* Get the value of the CFA as saved in CONTEXT. */
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_Unwind_Word
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_Unwind_GetCFA (struct _Unwind_Context *context)
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{
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return (_Unwind_Ptr) context->cfa;
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}
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/* Overwrite the saved value for register REG in CONTEXT with VAL. */
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inline void
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_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
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{
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* (_Unwind_Word *) context->reg[index] = val;
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}
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/* Retrieve the return address for CONTEXT. */
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inline _Unwind_Ptr
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_Unwind_GetIP (struct _Unwind_Context *context)
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{
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return (_Unwind_Ptr) context->ra;
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}
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/* Overwrite the return address for CONTEXT with VAL. */
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inline void
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_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
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{
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context->ra = (void *) val;
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}
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void *
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_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
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{
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return context->lsda;
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}
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_Unwind_Ptr
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_Unwind_GetRegionStart (struct _Unwind_Context *context)
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{
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return (_Unwind_Ptr) context->bases.func;
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}
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void *
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_Unwind_FindEnclosingFunction (void *pc)
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{
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struct dwarf_eh_bases bases;
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struct dwarf_fde *fde = _Unwind_Find_FDE (pc-1, &bases);
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if (fde)
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return bases.func;
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else
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return NULL;
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}
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#ifndef __ia64__
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_Unwind_Ptr
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_Unwind_GetDataRelBase (struct _Unwind_Context *context)
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{
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return (_Unwind_Ptr) context->bases.dbase;
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}
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_Unwind_Ptr
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_Unwind_GetTextRelBase (struct _Unwind_Context *context)
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{
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return (_Unwind_Ptr) context->bases.tbase;
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}
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#endif
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/* Extract any interesting information from the CIE for the translation
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unit F belongs to. Return a pointer to the byte after the augmentation,
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or NULL if we encountered an undecipherable augmentation. */
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static const unsigned char *
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extract_cie_info (struct dwarf_cie *cie, struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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const unsigned char *aug = cie->augmentation;
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const unsigned char *p = aug + strlen ((const char *) aug) + 1;
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const unsigned char *ret = NULL;
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_Unwind_Word utmp;
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/* g++ v2 "eh" has pointer immediately following augmentation string,
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so it must be handled first. */
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if (aug[0] == 'e' && aug[1] == 'h')
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{
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fs->eh_ptr = read_pointer (p);
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p += sizeof (void *);
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aug += 2;
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}
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/* Immediately following the augmentation are the code and
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data alignment and return address column. */
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p = read_uleb128 (p, &fs->code_align);
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p = read_sleb128 (p, &fs->data_align);
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fs->retaddr_column = *p++;
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fs->lsda_encoding = DW_EH_PE_omit;
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/* If the augmentation starts with 'z', then a uleb128 immediately
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follows containing the length of the augmentation field following
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the size. */
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if (*aug == 'z')
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{
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p = read_uleb128 (p, &utmp);
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ret = p + utmp;
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fs->saw_z = 1;
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++aug;
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}
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/* Iterate over recognized augmentation subsequences. */
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while (*aug != '\0')
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{
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/* "L" indicates a byte showing how the LSDA pointer is encoded. */
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if (aug[0] == 'L')
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{
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fs->lsda_encoding = *p++;
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aug += 1;
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}
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/* "R" indicates a byte indicating how FDE addresses are encoded. */
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else if (aug[0] == 'R')
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{
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fs->fde_encoding = *p++;
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aug += 1;
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}
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/* "P" indicates a personality routine in the CIE augmentation. */
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else if (aug[0] == 'P')
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{
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_Unwind_Ptr personality;
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p = read_encoded_value (context, *p, p + 1, &personality);
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fs->personality = (_Unwind_Personality_Fn) personality;
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aug += 1;
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}
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/* Otherwise we have an unknown augmentation string.
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Bail unless we saw a 'z' prefix. */
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else
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return ret;
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}
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return ret ? ret : p;
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}
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#ifndef _LIBC
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/* Decode a DW_OP stack program. Return the top of stack. Push INITIAL
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onto the stack to start. */
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static _Unwind_Word
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execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end,
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struct _Unwind_Context *context, _Unwind_Word initial)
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{
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_Unwind_Word stack[64]; /* ??? Assume this is enough. */
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int stack_elt;
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stack[0] = initial;
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stack_elt = 1;
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while (op_ptr < op_end)
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{
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enum dwarf_location_atom op = *op_ptr++;
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_Unwind_Word result, reg, utmp;
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_Unwind_Sword offset, stmp;
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switch (op)
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{
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case DW_OP_lit0:
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case DW_OP_lit1:
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case DW_OP_lit2:
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case DW_OP_lit3:
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case DW_OP_lit4:
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case DW_OP_lit5:
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case DW_OP_lit6:
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case DW_OP_lit7:
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case DW_OP_lit8:
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case DW_OP_lit9:
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case DW_OP_lit10:
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case DW_OP_lit11:
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case DW_OP_lit12:
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case DW_OP_lit13:
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case DW_OP_lit14:
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case DW_OP_lit15:
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case DW_OP_lit16:
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case DW_OP_lit17:
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case DW_OP_lit18:
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case DW_OP_lit19:
|
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case DW_OP_lit20:
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case DW_OP_lit21:
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case DW_OP_lit22:
|
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case DW_OP_lit23:
|
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case DW_OP_lit24:
|
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case DW_OP_lit25:
|
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case DW_OP_lit26:
|
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case DW_OP_lit27:
|
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case DW_OP_lit28:
|
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case DW_OP_lit29:
|
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case DW_OP_lit30:
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case DW_OP_lit31:
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result = op - DW_OP_lit0;
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break;
|
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|
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case DW_OP_addr:
|
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result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr);
|
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op_ptr += sizeof (void *);
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break;
|
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|
||
case DW_OP_const1u:
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result = read_1u (op_ptr);
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op_ptr += 1;
|
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break;
|
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case DW_OP_const1s:
|
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result = read_1s (op_ptr);
|
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op_ptr += 1;
|
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break;
|
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case DW_OP_const2u:
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result = read_2u (op_ptr);
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||
op_ptr += 2;
|
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break;
|
||
case DW_OP_const2s:
|
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result = read_2s (op_ptr);
|
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op_ptr += 2;
|
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break;
|
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case DW_OP_const4u:
|
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result = read_4u (op_ptr);
|
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op_ptr += 4;
|
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break;
|
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case DW_OP_const4s:
|
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result = read_4s (op_ptr);
|
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op_ptr += 4;
|
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break;
|
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case DW_OP_const8u:
|
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result = read_8u (op_ptr);
|
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op_ptr += 8;
|
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break;
|
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case DW_OP_const8s:
|
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result = read_8s (op_ptr);
|
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op_ptr += 8;
|
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break;
|
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case DW_OP_constu:
|
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op_ptr = read_uleb128 (op_ptr, &result);
|
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break;
|
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case DW_OP_consts:
|
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op_ptr = read_sleb128 (op_ptr, &stmp);
|
||
result = stmp;
|
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break;
|
||
|
||
case DW_OP_reg0:
|
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case DW_OP_reg1:
|
||
case DW_OP_reg2:
|
||
case DW_OP_reg3:
|
||
case DW_OP_reg4:
|
||
case DW_OP_reg5:
|
||
case DW_OP_reg6:
|
||
case DW_OP_reg7:
|
||
case DW_OP_reg8:
|
||
case DW_OP_reg9:
|
||
case DW_OP_reg10:
|
||
case DW_OP_reg11:
|
||
case DW_OP_reg12:
|
||
case DW_OP_reg13:
|
||
case DW_OP_reg14:
|
||
case DW_OP_reg15:
|
||
case DW_OP_reg16:
|
||
case DW_OP_reg17:
|
||
case DW_OP_reg18:
|
||
case DW_OP_reg19:
|
||
case DW_OP_reg20:
|
||
case DW_OP_reg21:
|
||
case DW_OP_reg22:
|
||
case DW_OP_reg23:
|
||
case DW_OP_reg24:
|
||
case DW_OP_reg25:
|
||
case DW_OP_reg26:
|
||
case DW_OP_reg27:
|
||
case DW_OP_reg28:
|
||
case DW_OP_reg29:
|
||
case DW_OP_reg30:
|
||
case DW_OP_reg31:
|
||
result = _Unwind_GetGR (context, op - DW_OP_reg0);
|
||
break;
|
||
case DW_OP_regx:
|
||
op_ptr = read_uleb128 (op_ptr, ®);
|
||
result = _Unwind_GetGR (context, reg);
|
||
break;
|
||
|
||
case DW_OP_breg0:
|
||
case DW_OP_breg1:
|
||
case DW_OP_breg2:
|
||
case DW_OP_breg3:
|
||
case DW_OP_breg4:
|
||
case DW_OP_breg5:
|
||
case DW_OP_breg6:
|
||
case DW_OP_breg7:
|
||
case DW_OP_breg8:
|
||
case DW_OP_breg9:
|
||
case DW_OP_breg10:
|
||
case DW_OP_breg11:
|
||
case DW_OP_breg12:
|
||
case DW_OP_breg13:
|
||
case DW_OP_breg14:
|
||
case DW_OP_breg15:
|
||
case DW_OP_breg16:
|
||
case DW_OP_breg17:
|
||
case DW_OP_breg18:
|
||
case DW_OP_breg19:
|
||
case DW_OP_breg20:
|
||
case DW_OP_breg21:
|
||
case DW_OP_breg22:
|
||
case DW_OP_breg23:
|
||
case DW_OP_breg24:
|
||
case DW_OP_breg25:
|
||
case DW_OP_breg26:
|
||
case DW_OP_breg27:
|
||
case DW_OP_breg28:
|
||
case DW_OP_breg29:
|
||
case DW_OP_breg30:
|
||
case DW_OP_breg31:
|
||
op_ptr = read_sleb128 (op_ptr, &offset);
|
||
result = _Unwind_GetGR (context, op - DW_OP_breg0) + offset;
|
||
break;
|
||
case DW_OP_bregx:
|
||
op_ptr = read_uleb128 (op_ptr, ®);
|
||
op_ptr = read_sleb128 (op_ptr, &offset);
|
||
result = _Unwind_GetGR (context, reg) + offset;
|
||
break;
|
||
|
||
case DW_OP_dup:
|
||
if (stack_elt < 1)
|
||
abort ();
|
||
result = stack[stack_elt - 1];
|
||
break;
|
||
|
||
case DW_OP_drop:
|
||
if (--stack_elt < 0)
|
||
abort ();
|
||
goto no_push;
|
||
|
||
case DW_OP_pick:
|
||
offset = *op_ptr++;
|
||
if (offset >= stack_elt - 1)
|
||
abort ();
|
||
result = stack[stack_elt - 1 - offset];
|
||
break;
|
||
|
||
case DW_OP_over:
|
||
if (stack_elt < 2)
|
||
abort ();
|
||
result = stack[stack_elt - 2];
|
||
break;
|
||
|
||
case DW_OP_rot:
|
||
{
|
||
_Unwind_Word t1, t2, t3;
|
||
|
||
if (stack_elt < 3)
|
||
abort ();
|
||
t1 = stack[stack_elt - 1];
|
||
t2 = stack[stack_elt - 2];
|
||
t3 = stack[stack_elt - 3];
|
||
stack[stack_elt - 1] = t2;
|
||
stack[stack_elt - 2] = t3;
|
||
stack[stack_elt - 3] = t1;
|
||
goto no_push;
|
||
}
|
||
|
||
case DW_OP_deref:
|
||
case DW_OP_deref_size:
|
||
case DW_OP_abs:
|
||
case DW_OP_neg:
|
||
case DW_OP_not:
|
||
case DW_OP_plus_uconst:
|
||
/* Unary operations. */
|
||
if (--stack_elt < 0)
|
||
abort ();
|
||
result = stack[stack_elt];
|
||
|
||
switch (op)
|
||
{
|
||
case DW_OP_deref:
|
||
{
|
||
void *ptr = (void *) (_Unwind_Ptr) result;
|
||
result = (_Unwind_Ptr) read_pointer (ptr);
|
||
}
|
||
break;
|
||
|
||
case DW_OP_deref_size:
|
||
{
|
||
void *ptr = (void *) (_Unwind_Ptr) result;
|
||
switch (*op_ptr++)
|
||
{
|
||
case 1:
|
||
result = read_1u (ptr);
|
||
break;
|
||
case 2:
|
||
result = read_2u (ptr);
|
||
break;
|
||
case 4:
|
||
result = read_4u (ptr);
|
||
break;
|
||
case 8:
|
||
result = read_8u (ptr);
|
||
break;
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DW_OP_abs:
|
||
if ((_Unwind_Sword) result < 0)
|
||
result = -result;
|
||
break;
|
||
case DW_OP_neg:
|
||
result = -result;
|
||
break;
|
||
case DW_OP_not:
|
||
result = ~result;
|
||
break;
|
||
case DW_OP_plus_uconst:
|
||
op_ptr = read_uleb128 (op_ptr, &utmp);
|
||
result += utmp;
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
break;
|
||
|
||
case DW_OP_and:
|
||
case DW_OP_div:
|
||
case DW_OP_minus:
|
||
case DW_OP_mod:
|
||
case DW_OP_mul:
|
||
case DW_OP_or:
|
||
case DW_OP_plus:
|
||
case DW_OP_le:
|
||
case DW_OP_ge:
|
||
case DW_OP_eq:
|
||
case DW_OP_lt:
|
||
case DW_OP_gt:
|
||
case DW_OP_ne:
|
||
{
|
||
/* Binary operations. */
|
||
_Unwind_Word first, second;
|
||
if ((stack_elt -= 2) < 0)
|
||
abort ();
|
||
second = stack[stack_elt];
|
||
first = stack[stack_elt + 1];
|
||
|
||
switch (op)
|
||
{
|
||
case DW_OP_and:
|
||
result = second & first;
|
||
break;
|
||
case DW_OP_div:
|
||
result = (_Unwind_Sword) second / (_Unwind_Sword) first;
|
||
break;
|
||
case DW_OP_minus:
|
||
result = second - first;
|
||
break;
|
||
case DW_OP_mod:
|
||
result = (_Unwind_Sword) second % (_Unwind_Sword) first;
|
||
break;
|
||
case DW_OP_mul:
|
||
result = second * first;
|
||
break;
|
||
case DW_OP_or:
|
||
result = second | first;
|
||
break;
|
||
case DW_OP_plus:
|
||
result = second + first;
|
||
break;
|
||
case DW_OP_shl:
|
||
result = second << first;
|
||
break;
|
||
case DW_OP_shr:
|
||
result = second >> first;
|
||
break;
|
||
case DW_OP_shra:
|
||
result = (_Unwind_Sword) second >> first;
|
||
break;
|
||
case DW_OP_xor:
|
||
result = second ^ first;
|
||
break;
|
||
case DW_OP_le:
|
||
result = (_Unwind_Sword) first <= (_Unwind_Sword) second;
|
||
break;
|
||
case DW_OP_ge:
|
||
result = (_Unwind_Sword) first >= (_Unwind_Sword) second;
|
||
break;
|
||
case DW_OP_eq:
|
||
result = (_Unwind_Sword) first == (_Unwind_Sword) second;
|
||
break;
|
||
case DW_OP_lt:
|
||
result = (_Unwind_Sword) first < (_Unwind_Sword) second;
|
||
break;
|
||
case DW_OP_gt:
|
||
result = (_Unwind_Sword) first > (_Unwind_Sword) second;
|
||
break;
|
||
case DW_OP_ne:
|
||
result = (_Unwind_Sword) first != (_Unwind_Sword) second;
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DW_OP_skip:
|
||
offset = read_2s (op_ptr);
|
||
op_ptr += 2;
|
||
op_ptr += offset;
|
||
goto no_push;
|
||
|
||
case DW_OP_bra:
|
||
if (--stack_elt < 0)
|
||
abort ();
|
||
offset = read_2s (op_ptr);
|
||
op_ptr += 2;
|
||
if (stack[stack_elt] != 0)
|
||
op_ptr += offset;
|
||
goto no_push;
|
||
|
||
case DW_OP_nop:
|
||
goto no_push;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
|
||
/* Most things push a result value. */
|
||
if ((size_t) stack_elt >= sizeof(stack)/sizeof(*stack))
|
||
abort ();
|
||
stack[stack_elt++] = result;
|
||
no_push:;
|
||
}
|
||
|
||
/* We were executing this program to get a value. It should be
|
||
at top of stack. */
|
||
if (--stack_elt < 0)
|
||
abort ();
|
||
return stack[stack_elt];
|
||
}
|
||
#endif
|
||
|
||
/* Decode DWARF 2 call frame information. Takes pointers the
|
||
instruction sequence to decode, current register information and
|
||
CIE info, and the PC range to evaluate. */
|
||
|
||
static void
|
||
execute_cfa_program (const unsigned char *insn_ptr,
|
||
const unsigned char *insn_end,
|
||
struct _Unwind_Context *context,
|
||
_Unwind_FrameState *fs)
|
||
{
|
||
struct frame_state_reg_info *unused_rs = NULL;
|
||
|
||
/* Don't allow remember/restore between CIE and FDE programs. */
|
||
fs->regs.prev = NULL;
|
||
|
||
/* The comparison with the return address uses < rather than <= because
|
||
we are only interested in the effects of code before the call; for a
|
||
noreturn function, the return address may point to unrelated code with
|
||
a different stack configuration that we are not interested in. We
|
||
assume that the call itself is unwind info-neutral; if not, or if
|
||
there are delay instructions that adjust the stack, these must be
|
||
reflected at the point immediately before the call insn. */
|
||
while (insn_ptr < insn_end && fs->pc < context->ra)
|
||
{
|
||
unsigned char insn = *insn_ptr++;
|
||
_Unwind_Word reg, utmp;
|
||
_Unwind_Sword offset, stmp;
|
||
|
||
if ((insn & 0xc0) == DW_CFA_advance_loc)
|
||
fs->pc += (insn & 0x3f) * fs->code_align;
|
||
else if ((insn & 0xc0) == DW_CFA_offset)
|
||
{
|
||
reg = insn & 0x3f;
|
||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
||
offset = (_Unwind_Sword) utmp * fs->data_align;
|
||
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
|
||
fs->regs.reg[reg].loc.offset = offset;
|
||
}
|
||
else if ((insn & 0xc0) == DW_CFA_restore)
|
||
{
|
||
reg = insn & 0x3f;
|
||
fs->regs.reg[reg].how = REG_UNSAVED;
|
||
}
|
||
else switch (insn)
|
||
{
|
||
case DW_CFA_set_loc:
|
||
{
|
||
_Unwind_Ptr pc;
|
||
insn_ptr = read_encoded_value (context, fs->fde_encoding,
|
||
insn_ptr, &pc);
|
||
fs->pc = (void *) pc;
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_advance_loc1:
|
||
fs->pc += read_1u (insn_ptr) * fs->code_align;
|
||
insn_ptr += 1;
|
||
break;
|
||
case DW_CFA_advance_loc2:
|
||
fs->pc += read_2u (insn_ptr) * fs->code_align;
|
||
insn_ptr += 2;
|
||
break;
|
||
case DW_CFA_advance_loc4:
|
||
fs->pc += read_4u (insn_ptr) * fs->code_align;
|
||
insn_ptr += 4;
|
||
break;
|
||
|
||
case DW_CFA_offset_extended:
|
||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
||
offset = (_Unwind_Sword) utmp * fs->data_align;
|
||
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
|
||
fs->regs.reg[reg].loc.offset = offset;
|
||
break;
|
||
|
||
case DW_CFA_restore_extended:
|
||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
||
fs->regs.reg[reg].how = REG_UNSAVED;
|
||
break;
|
||
|
||
case DW_CFA_undefined:
|
||
case DW_CFA_same_value:
|
||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
||
break;
|
||
|
||
case DW_CFA_nop:
|
||
break;
|
||
|
||
case DW_CFA_register:
|
||
{
|
||
_Unwind_Word reg2;
|
||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
||
insn_ptr = read_uleb128 (insn_ptr, ®2);
|
||
fs->regs.reg[reg].how = REG_SAVED_REG;
|
||
fs->regs.reg[reg].loc.reg = reg2;
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_remember_state:
|
||
{
|
||
struct frame_state_reg_info *new_rs;
|
||
if (unused_rs)
|
||
{
|
||
new_rs = unused_rs;
|
||
unused_rs = unused_rs->prev;
|
||
}
|
||
else
|
||
new_rs = __builtin_alloca (sizeof (struct frame_state_reg_info));
|
||
|
||
*new_rs = fs->regs;
|
||
fs->regs.prev = new_rs;
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_restore_state:
|
||
{
|
||
struct frame_state_reg_info *old_rs = fs->regs.prev;
|
||
#ifdef _LIBC
|
||
if (old_rs == NULL)
|
||
__libc_fatal ("invalid DWARF unwind data");
|
||
else
|
||
#endif
|
||
{
|
||
fs->regs = *old_rs;
|
||
old_rs->prev = unused_rs;
|
||
unused_rs = old_rs;
|
||
}
|
||
}
|
||
break;
|
||
|
||
case DW_CFA_def_cfa:
|
||
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
|
||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
||
fs->cfa_offset = utmp;
|
||
fs->cfa_how = CFA_REG_OFFSET;
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_register:
|
||
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
|
||
fs->cfa_how = CFA_REG_OFFSET;
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_offset:
|
||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
||
fs->cfa_offset = utmp;
|
||
/* cfa_how deliberately not set. */
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_expression:
|
||
fs->cfa_exp = insn_ptr;
|
||
fs->cfa_how = CFA_EXP;
|
||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
||
insn_ptr += utmp;
|
||
break;
|
||
|
||
case DW_CFA_expression:
|
||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
||
fs->regs.reg[reg].how = REG_SAVED_EXP;
|
||
fs->regs.reg[reg].loc.exp = insn_ptr;
|
||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
||
insn_ptr += utmp;
|
||
break;
|
||
|
||
/* From the 2.1 draft. */
|
||
case DW_CFA_offset_extended_sf:
|
||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
||
insn_ptr = read_sleb128 (insn_ptr, &stmp);
|
||
offset = stmp * fs->data_align;
|
||
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
|
||
fs->regs.reg[reg].loc.offset = offset;
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_sf:
|
||
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
|
||
insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset);
|
||
fs->cfa_how = CFA_REG_OFFSET;
|
||
break;
|
||
|
||
case DW_CFA_def_cfa_offset_sf:
|
||
insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset);
|
||
/* cfa_how deliberately not set. */
|
||
break;
|
||
|
||
case DW_CFA_GNU_window_save:
|
||
/* ??? Hardcoded for SPARC register window configuration.
|
||
At least do not do anything for archs which explicitly
|
||
define a lower register number. */
|
||
#if DWARF_FRAME_REGISTERS >= 32
|
||
for (reg = 16; reg < 32; ++reg)
|
||
{
|
||
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
|
||
fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *);
|
||
}
|
||
#endif
|
||
break;
|
||
|
||
case DW_CFA_GNU_args_size:
|
||
insn_ptr = read_uleb128 (insn_ptr, &context->args_size);
|
||
break;
|
||
|
||
case DW_CFA_GNU_negative_offset_extended:
|
||
/* Obsoleted by DW_CFA_offset_extended_sf, but used by
|
||
older PowerPC code. */
|
||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
||
offset = (_Unwind_Word) utmp * fs->data_align;
|
||
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
|
||
fs->regs.reg[reg].loc.offset = -offset;
|
||
break;
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Given the _Unwind_Context CONTEXT for a stack frame, look up the FDE for
|
||
its caller and decode it into FS. This function also sets the
|
||
args_size and lsda members of CONTEXT, as they are really information
|
||
about the caller's frame. */
|
||
|
||
static _Unwind_Reason_Code
|
||
uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
|
||
{
|
||
struct dwarf_fde *fde;
|
||
struct dwarf_cie *cie;
|
||
const unsigned char *aug, *insn, *end;
|
||
|
||
memset (fs, 0, sizeof (*fs));
|
||
context->args_size = 0;
|
||
context->lsda = 0;
|
||
|
||
fde = _Unwind_Find_FDE (context->ra - 1, &context->bases);
|
||
if (fde == NULL)
|
||
{
|
||
/* Couldn't find frame unwind info for this function. Try a
|
||
target-specific fallback mechanism. This will necessarily
|
||
not provide a personality routine or LSDA. */
|
||
#ifdef MD_FALLBACK_FRAME_STATE_FOR
|
||
MD_FALLBACK_FRAME_STATE_FOR (context, fs, success);
|
||
return _URC_END_OF_STACK;
|
||
success:
|
||
return _URC_NO_REASON;
|
||
#else
|
||
return _URC_END_OF_STACK;
|
||
#endif
|
||
}
|
||
|
||
fs->pc = context->bases.func;
|
||
|
||
cie = get_cie (fde);
|
||
insn = extract_cie_info (cie, context, fs);
|
||
if (insn == NULL)
|
||
/* CIE contained unknown augmentation. */
|
||
return _URC_FATAL_PHASE1_ERROR;
|
||
|
||
/* First decode all the insns in the CIE. */
|
||
end = (unsigned char *) next_fde ((struct dwarf_fde *) cie);
|
||
execute_cfa_program (insn, end, context, fs);
|
||
|
||
/* Locate augmentation for the fde. */
|
||
aug = (unsigned char *) fde + sizeof (*fde);
|
||
aug += 2 * size_of_encoded_value (fs->fde_encoding);
|
||
insn = NULL;
|
||
if (fs->saw_z)
|
||
{
|
||
_Unwind_Word i;
|
||
aug = read_uleb128 (aug, &i);
|
||
insn = aug + i;
|
||
}
|
||
if (fs->lsda_encoding != DW_EH_PE_omit)
|
||
{
|
||
_Unwind_Ptr lsda;
|
||
aug = read_encoded_value (context, fs->lsda_encoding, aug, &lsda);
|
||
context->lsda = (void *) lsda;
|
||
}
|
||
|
||
/* Then the insns in the FDE up to our target PC. */
|
||
if (insn == NULL)
|
||
insn = aug;
|
||
end = (unsigned char *) next_fde (fde);
|
||
execute_cfa_program (insn, end, context, fs);
|
||
|
||
return _URC_NO_REASON;
|
||
}
|
||
|
||
typedef struct frame_state
|
||
{
|
||
void *cfa;
|
||
void *eh_ptr;
|
||
long cfa_offset;
|
||
long args_size;
|
||
long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1];
|
||
unsigned short cfa_reg;
|
||
unsigned short retaddr_column;
|
||
char saved[PRE_GCC3_DWARF_FRAME_REGISTERS+1];
|
||
} frame_state;
|
||
|
||
#ifndef STATIC
|
||
# define STATIC
|
||
#endif
|
||
|
||
STATIC
|
||
struct frame_state * __frame_state_for (void *, struct frame_state *);
|
||
|
||
/* Called from pre-G++ 3.0 __throw to find the registers to restore for
|
||
a given PC_TARGET. The caller should allocate a local variable of
|
||
`struct frame_state' and pass its address to STATE_IN. */
|
||
|
||
STATIC
|
||
struct frame_state *
|
||
__frame_state_for (void *pc_target, struct frame_state *state_in)
|
||
{
|
||
struct _Unwind_Context context;
|
||
_Unwind_FrameState fs;
|
||
int reg;
|
||
|
||
memset (&context, 0, sizeof (struct _Unwind_Context));
|
||
context.ra = pc_target + 1;
|
||
|
||
if (uw_frame_state_for (&context, &fs) != _URC_NO_REASON)
|
||
return 0;
|
||
|
||
/* We have no way to pass a location expression for the CFA to our
|
||
caller. It wouldn't understand it anyway. */
|
||
if (fs.cfa_how == CFA_EXP)
|
||
return 0;
|
||
|
||
for (reg = 0; reg < PRE_GCC3_DWARF_FRAME_REGISTERS + 1; reg++)
|
||
{
|
||
state_in->saved[reg] = fs.regs.reg[reg].how;
|
||
switch (state_in->saved[reg])
|
||
{
|
||
case REG_SAVED_REG:
|
||
state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.reg;
|
||
break;
|
||
case REG_SAVED_OFFSET:
|
||
state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.offset;
|
||
break;
|
||
default:
|
||
state_in->reg_or_offset[reg] = 0;
|
||
break;
|
||
}
|
||
}
|
||
|
||
state_in->cfa_offset = fs.cfa_offset;
|
||
state_in->cfa_reg = fs.cfa_reg;
|
||
state_in->retaddr_column = fs.retaddr_column;
|
||
state_in->args_size = context.args_size;
|
||
state_in->eh_ptr = fs.eh_ptr;
|
||
|
||
return state_in;
|
||
}
|
||
|
||
#ifndef _LIBC
|
||
|
||
static void
|
||
uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
|
||
{
|
||
struct _Unwind_Context orig_context = *context;
|
||
void *cfa;
|
||
long i;
|
||
|
||
#ifdef EH_RETURN_STACKADJ_RTX
|
||
/* Special handling here: Many machines do not use a frame pointer,
|
||
and track the CFA only through offsets from the stack pointer from
|
||
one frame to the next. In this case, the stack pointer is never
|
||
stored, so it has no saved address in the context. What we do
|
||
have is the CFA from the previous stack frame.
|
||
|
||
In very special situations (such as unwind info for signal return),
|
||
there may be location expressions that use the stack pointer as well.
|
||
|
||
Do this conditionally for one frame. This allows the unwind info
|
||
for one frame to save a copy of the stack pointer from the previous
|
||
frame, and be able to use much easier CFA mechanisms to do it.
|
||
Always zap the saved stack pointer value for the next frame; carrying
|
||
the value over from one frame to another doesn't make sense. */
|
||
|
||
_Unwind_Word tmp_sp;
|
||
|
||
if (!orig_context.reg[__builtin_dwarf_sp_column ()])
|
||
{
|
||
tmp_sp = (_Unwind_Ptr) context->cfa;
|
||
orig_context.reg[__builtin_dwarf_sp_column ()] = &tmp_sp;
|
||
}
|
||
context->reg[__builtin_dwarf_sp_column ()] = NULL;
|
||
#endif
|
||
|
||
/* Compute this frame's CFA. */
|
||
switch (fs->cfa_how)
|
||
{
|
||
case CFA_REG_OFFSET:
|
||
cfa = (void *) (_Unwind_Ptr) _Unwind_GetGR (&orig_context, fs->cfa_reg);
|
||
cfa += fs->cfa_offset;
|
||
break;
|
||
|
||
case CFA_EXP:
|
||
{
|
||
const unsigned char *exp = fs->cfa_exp;
|
||
_Unwind_Word len;
|
||
|
||
exp = read_uleb128 (exp, &len);
|
||
cfa = (void *) (_Unwind_Ptr)
|
||
execute_stack_op (exp, exp + len, &orig_context, 0);
|
||
break;
|
||
}
|
||
|
||
default:
|
||
abort ();
|
||
}
|
||
context->cfa = cfa;
|
||
|
||
/* Compute the addresses of all registers saved in this frame. */
|
||
for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i)
|
||
switch (fs->regs.reg[i].how)
|
||
{
|
||
case REG_UNSAVED:
|
||
break;
|
||
|
||
case REG_SAVED_OFFSET:
|
||
context->reg[i] = cfa + fs->regs.reg[i].loc.offset;
|
||
break;
|
||
|
||
case REG_SAVED_REG:
|
||
context->reg[i] = orig_context.reg[fs->regs.reg[i].loc.reg];
|
||
break;
|
||
|
||
case REG_SAVED_EXP:
|
||
{
|
||
const unsigned char *exp = fs->regs.reg[i].loc.exp;
|
||
_Unwind_Word len;
|
||
_Unwind_Ptr val;
|
||
|
||
exp = read_uleb128 (exp, &len);
|
||
val = execute_stack_op (exp, exp + len, &orig_context,
|
||
(_Unwind_Ptr) cfa);
|
||
context->reg[i] = (void *) val;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* CONTEXT describes the unwind state for a frame, and FS describes the FDE
|
||
of its caller. Update CONTEXT to refer to the caller as well. Note
|
||
that the args_size and lsda members are not updated here, but later in
|
||
uw_frame_state_for. */
|
||
|
||
static void
|
||
uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
|
||
{
|
||
uw_update_context_1 (context, fs);
|
||
|
||
/* Compute the return address now, since the return address column
|
||
can change from frame to frame. */
|
||
context->ra = __builtin_extract_return_addr
|
||
((void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->retaddr_column));
|
||
}
|
||
|
||
/* Fill in CONTEXT for top-of-stack. The only valid registers at this
|
||
level will be the return address and the CFA. */
|
||
|
||
#define uw_init_context(CONTEXT) \
|
||
do \
|
||
{ \
|
||
/* Do any necessary initialization to access arbitrary stack frames. \
|
||
On the SPARC, this means flushing the register windows. */ \
|
||
__builtin_unwind_init (); \
|
||
uw_init_context_1 (CONTEXT, __builtin_dwarf_cfa (), \
|
||
__builtin_return_address (0)); \
|
||
} \
|
||
while (0)
|
||
|
||
static void
|
||
uw_init_context_1 (struct _Unwind_Context *context,
|
||
void *outer_cfa, void *outer_ra)
|
||
{
|
||
void *ra = __builtin_extract_return_addr (__builtin_return_address (0));
|
||
_Unwind_FrameState fs;
|
||
_Unwind_Word sp_slot;
|
||
|
||
memset (context, 0, sizeof (struct _Unwind_Context));
|
||
context->ra = ra;
|
||
|
||
if (uw_frame_state_for (context, &fs) != _URC_NO_REASON)
|
||
abort ();
|
||
|
||
/* Force the frame state to use the known cfa value. */
|
||
sp_slot = (_Unwind_Ptr) outer_cfa;
|
||
context->reg[__builtin_dwarf_sp_column ()] = &sp_slot;
|
||
fs.cfa_how = CFA_REG_OFFSET;
|
||
fs.cfa_reg = __builtin_dwarf_sp_column ();
|
||
fs.cfa_offset = 0;
|
||
|
||
uw_update_context_1 (context, &fs);
|
||
|
||
/* If the return address column was saved in a register in the
|
||
initialization context, then we can't see it in the given
|
||
call frame data. So have the initialization context tell us. */
|
||
context->ra = __builtin_extract_return_addr (outer_ra);
|
||
}
|
||
|
||
|
||
/* Install TARGET into CURRENT so that we can return to it. This is a
|
||
macro because __builtin_eh_return must be invoked in the context of
|
||
our caller. */
|
||
|
||
#define uw_install_context(CURRENT, TARGET) \
|
||
do \
|
||
{ \
|
||
long offset = uw_install_context_1 ((CURRENT), (TARGET)); \
|
||
void *handler = __builtin_frob_return_addr ((TARGET)->ra); \
|
||
__builtin_eh_return (offset, handler); \
|
||
} \
|
||
while (0)
|
||
|
||
static inline void
|
||
init_dwarf_reg_size_table (void)
|
||
{
|
||
__builtin_init_dwarf_reg_size_table (dwarf_reg_size_table);
|
||
}
|
||
|
||
static long
|
||
uw_install_context_1 (struct _Unwind_Context *current,
|
||
struct _Unwind_Context *target)
|
||
{
|
||
long i;
|
||
|
||
#if __GTHREADS
|
||
{
|
||
static __gthread_once_t once_regsizes = __GTHREAD_ONCE_INIT;
|
||
if (__gthread_once (&once_regsizes, init_dwarf_reg_size_table) != 0
|
||
|| dwarf_reg_size_table[0] == 0)
|
||
init_dwarf_reg_size_table ();
|
||
}
|
||
#else
|
||
if (dwarf_reg_size_table[0] == 0)
|
||
init_dwarf_reg_size_table ();
|
||
#endif
|
||
|
||
for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
|
||
{
|
||
void *c = current->reg[i];
|
||
void *t = target->reg[i];
|
||
if (t && c && t != c)
|
||
memcpy (c, t, dwarf_reg_size_table[i]);
|
||
}
|
||
|
||
#ifdef EH_RETURN_STACKADJ_RTX
|
||
{
|
||
void *target_cfa;
|
||
|
||
/* If the last frame records a saved stack pointer, use it. */
|
||
if (target->reg[__builtin_dwarf_sp_column ()])
|
||
target_cfa = (void *)(_Unwind_Ptr)
|
||
_Unwind_GetGR (target, __builtin_dwarf_sp_column ());
|
||
else
|
||
target_cfa = target->cfa;
|
||
|
||
/* We adjust SP by the difference between CURRENT and TARGET's CFA. */
|
||
if (STACK_GROWS_DOWNWARD)
|
||
return target_cfa - current->cfa + target->args_size;
|
||
else
|
||
return current->cfa - target_cfa - target->args_size;
|
||
}
|
||
#else
|
||
return 0;
|
||
#endif
|
||
}
|
||
|
||
static inline _Unwind_Ptr
|
||
uw_identify_context (struct _Unwind_Context *context)
|
||
{
|
||
return _Unwind_GetIP (context);
|
||
}
|
||
|
||
|
||
#include "unwind.inc"
|
||
|
||
#endif /* _LIBC */
|