@@ -330,12 +330,14 @@ aarch64*-*-elf | aarch64*-*-rtems*)
extra_parts="$extra_parts crtfastmath.o"
tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
+ tmake_file="${tmake_file} ${cpu_type}/t-eh-aarch64"
;;
aarch64*-*-linux*)
extra_parts="$extra_parts crtfastmath.o"
md_unwind_header=aarch64/linux-unwind.h
tmake_file="${tmake_file} ${cpu_type}/t-aarch64"
tmake_file="${tmake_file} ${cpu_type}/t-softfp t-softfp t-crtfm"
+ tmake_file="${tmake_file} ${cpu_type}/t-eh-aarch64"
;;
alpha*-*-linux*)
tmake_file="${tmake_file} alpha/t-alpha alpha/t-ieee t-crtfm alpha/t-linux"
new file mode 100644
@@ -0,0 +1,3 @@
+# Use customized EH unwinder implementation.
+LIB2ADDEH = $(srcdir)/config/aarch64/unwind-aarch64.c $(srcdir)/unwind-dw2-fde-dip.c \
+ $(srcdir)/unwind-sjlj.c $(srcdir)/unwind-c.c
new file mode 100644
@@ -0,0 +1,1715 @@
+/* DWARF2 exception handling and frame unwind runtime interface routines.
+ Copyright (C) 1997-2016 Free Software Foundation, Inc.
+
+ This file is part of GCC.
+
+ GCC is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ GCC is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ License for more details.
+
+ Under Section 7 of GPL version 3, you are granted additional
+ permissions described in the GCC Runtime Library Exception, version
+ 3.1, as published by the Free Software Foundation.
+
+ You should have received a copy of the GNU General Public License and
+ a copy of the GCC Runtime Library Exception along with this program;
+ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include "tconfig.h"
+#include "tsystem.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "libgcc_tm.h"
+#include "dwarf2.h"
+#include "unwind.h"
+#ifdef __USING_SJLJ_EXCEPTIONS__
+# define NO_SIZE_OF_ENCODED_VALUE
+#endif
+#include "unwind-pe.h"
+#include "unwind-dw2-fde.h"
+#include "gthr.h"
+#include "unwind-dw2.h"
+
+#ifdef HAVE_SYS_SDT_H
+#include <sys/sdt.h>
+#endif
+
+#ifndef __USING_SJLJ_EXCEPTIONS__
+
+#ifndef __LIBGCC_STACK_GROWS_DOWNWARD__
+#define __LIBGCC_STACK_GROWS_DOWNWARD__ 0
+#else
+#undef __LIBGCC_STACK_GROWS_DOWNWARD__
+#define __LIBGCC_STACK_GROWS_DOWNWARD__ 1
+#endif
+
+/* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */
+#ifndef PRE_GCC3_DWARF_FRAME_REGISTERS
+#define PRE_GCC3_DWARF_FRAME_REGISTERS __LIBGCC_DWARF_FRAME_REGISTERS__
+#endif
+
+/* ??? For the public function interfaces, we tend to gcc_assert that the
+ column numbers are in range. For the dwarf2 unwind info this does happen,
+ although so far in a case that doesn't actually matter.
+
+ See PR49146, in which a call from x86_64 ms abi to x86_64 unix abi stores
+ the call-saved xmm registers and annotates them. We havn't bothered
+ providing support for the xmm registers for the x86_64 port primarily
+ because the 64-bit windows targets don't use dwarf2 unwind, using sjlj or
+ SEH instead. Adding the support for unix targets would generally be a
+ waste. However, some runtime libraries supplied with ICC do contain such
+ an unorthodox transition, as well as the unwind info to match. This loss
+ of register restoration doesn't matter in practice, because the exception
+ is caught in the native unix abi, where all of the xmm registers are
+ call clobbered.
+
+ Ideally, we'd record some bit to notice when we're failing to restore some
+ register recorded in the unwind info, but to do that we need annotation on
+ the unix->ms abi edge, so that we know when the register data may be
+ discarded. And since this edge is also within the ICC library, we're
+ unlikely to be able to get the new annotation.
+
+ Barring a magic solution to restore the ms abi defined 128-bit xmm registers
+ (as distictly opposed to the full runtime width) without causing extra
+ overhead for normal unix abis, the best solution seems to be to simply
+ ignore unwind data for unknown columns. */
+
+#define UNWIND_COLUMN_IN_RANGE(x) \
+ __builtin_expect((x) <= __LIBGCC_DWARF_FRAME_REGISTERS__, 1)
+
+#ifdef REG_VALUE_IN_UNWIND_CONTEXT
+typedef _Unwind_Word _Unwind_Context_Reg_Val;
+
+#ifndef ASSUME_EXTENDED_UNWIND_CONTEXT
+#define ASSUME_EXTENDED_UNWIND_CONTEXT 1
+#endif
+
+static inline _Unwind_Word
+_Unwind_Get_Unwind_Word (_Unwind_Context_Reg_Val val)
+{
+ return val;
+}
+
+static inline _Unwind_Context_Reg_Val
+_Unwind_Get_Unwind_Context_Reg_Val (_Unwind_Word val)
+{
+ return val;
+}
+#else
+typedef void *_Unwind_Context_Reg_Val;
+
+static inline _Unwind_Word
+_Unwind_Get_Unwind_Word (_Unwind_Context_Reg_Val val)
+{
+ return (_Unwind_Word) (_Unwind_Internal_Ptr) val;
+}
+
+static inline _Unwind_Context_Reg_Val
+_Unwind_Get_Unwind_Context_Reg_Val (_Unwind_Word val)
+{
+ return (_Unwind_Context_Reg_Val) (_Unwind_Internal_Ptr) val;
+}
+#endif
+
+#ifndef ASSUME_EXTENDED_UNWIND_CONTEXT
+#define ASSUME_EXTENDED_UNWIND_CONTEXT 0
+#endif
+
+/* This is the register and unwind state for a particular frame. This
+ provides the information necessary to unwind up past a frame and return
+ to its caller. */
+struct _Unwind_Context
+{
+ _Unwind_Context_Reg_Val reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
+ void *cfa;
+ void *ra;
+ void *lsda;
+ struct dwarf_eh_bases bases;
+ /* Signal frame context. */
+#define SIGNAL_FRAME_BIT ((~(_Unwind_Word) 0 >> 1) + 1)
+ /* Context which has version/args_size/by_value fields. */
+#define EXTENDED_CONTEXT_BIT ((~(_Unwind_Word) 0 >> 2) + 1)
+ _Unwind_Word flags;
+ /* 0 for now, can be increased when further fields are added to
+ struct _Unwind_Context. */
+ _Unwind_Word version;
+ _Unwind_Word args_size;
+ char by_value[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
+};
+
+/* Byte size of every register managed by these routines. */
+static unsigned char dwarf_reg_size_table[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
+
+
+/* Read unaligned data from the instruction buffer. */
+
+union unaligned
+{
+ void *p;
+ unsigned u2 __attribute__ ((mode (HI)));
+ unsigned u4 __attribute__ ((mode (SI)));
+ unsigned u8 __attribute__ ((mode (DI)));
+ signed s2 __attribute__ ((mode (HI)));
+ signed s4 __attribute__ ((mode (SI)));
+ signed s8 __attribute__ ((mode (DI)));
+} __attribute__ ((packed));
+
+static void uw_update_context (struct _Unwind_Context *, _Unwind_FrameState *);
+static _Unwind_Reason_Code uw_frame_state_for (struct _Unwind_Context *,
+ _Unwind_FrameState *);
+
+static inline void *
+read_pointer (const void *p) { const union unaligned *up = p; return up->p; }
+
+static inline int
+read_1u (const void *p) { return *(const unsigned char *) p; }
+
+static inline int
+read_1s (const void *p) { return *(const signed char *) p; }
+
+static inline int
+read_2u (const void *p) { const union unaligned *up = p; return up->u2; }
+
+static inline int
+read_2s (const void *p) { const union unaligned *up = p; return up->s2; }
+
+static inline unsigned int
+read_4u (const void *p) { const union unaligned *up = p; return up->u4; }
+
+static inline int
+read_4s (const void *p) { const union unaligned *up = p; return up->s4; }
+
+static inline unsigned long
+read_8u (const void *p) { const union unaligned *up = p; return up->u8; }
+
+static inline unsigned long
+read_8s (const void *p) { const union unaligned *up = p; return up->s8; }
+
+static inline _Unwind_Word
+_Unwind_IsSignalFrame (struct _Unwind_Context *context)
+{
+ return (context->flags & SIGNAL_FRAME_BIT) ? 1 : 0;
+}
+
+static inline void
+_Unwind_SetSignalFrame (struct _Unwind_Context *context, int val)
+{
+ if (val)
+ context->flags |= SIGNAL_FRAME_BIT;
+ else
+ context->flags &= ~SIGNAL_FRAME_BIT;
+}
+
+static inline _Unwind_Word
+_Unwind_IsExtendedContext (struct _Unwind_Context *context)
+{
+ return (ASSUME_EXTENDED_UNWIND_CONTEXT
+ || (context->flags & EXTENDED_CONTEXT_BIT));
+}
+
+/* Get the value of register INDEX as saved in CONTEXT. */
+
+inline _Unwind_Word
+_Unwind_GetGR (struct _Unwind_Context *context, int index)
+{
+ int size;
+ _Unwind_Context_Reg_Val val;
+
+#ifdef DWARF_ZERO_REG
+ if (index == DWARF_ZERO_REG)
+ return 0;
+#endif
+
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
+ size = dwarf_reg_size_table[index];
+ val = context->reg[index];
+
+ if (_Unwind_IsExtendedContext (context) && context->by_value[index])
+ return _Unwind_Get_Unwind_Word (val);
+
+ /* This will segfault if the register hasn't been saved. */
+ if (size == sizeof(_Unwind_Ptr))
+ return * (_Unwind_Ptr *) (_Unwind_Internal_Ptr) val;
+ else
+ {
+ gcc_assert (size == sizeof(_Unwind_Word));
+ return * (_Unwind_Word *) (_Unwind_Internal_Ptr) val;
+ }
+}
+
+static inline void *
+_Unwind_GetPtr (struct _Unwind_Context *context, int index)
+{
+ return (void *)(_Unwind_Ptr) _Unwind_GetGR (context, index);
+}
+
+/* Get the value of the CFA as saved in CONTEXT. */
+
+_Unwind_Word
+_Unwind_GetCFA (struct _Unwind_Context *context)
+{
+ return (_Unwind_Ptr) context->cfa;
+}
+
+/* Overwrite the saved value for register INDEX in CONTEXT with VAL. */
+
+inline void
+_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
+{
+ int size;
+ void *ptr;
+
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
+ size = dwarf_reg_size_table[index];
+
+ if (_Unwind_IsExtendedContext (context) && context->by_value[index])
+ {
+ context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val);
+ return;
+ }
+
+ ptr = (void *) (_Unwind_Internal_Ptr) context->reg[index];
+
+ if (size == sizeof(_Unwind_Ptr))
+ * (_Unwind_Ptr *) ptr = val;
+ else
+ {
+ gcc_assert (size == sizeof(_Unwind_Word));
+ * (_Unwind_Word *) ptr = val;
+ }
+}
+
+/* Get the pointer to a register INDEX as saved in CONTEXT. */
+
+static inline void *
+_Unwind_GetGRPtr (struct _Unwind_Context *context, int index)
+{
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ if (_Unwind_IsExtendedContext (context) && context->by_value[index])
+ return &context->reg[index];
+ return (void *) (_Unwind_Internal_Ptr) context->reg[index];
+}
+
+/* Set the pointer to a register INDEX as saved in CONTEXT. */
+
+static inline void
+_Unwind_SetGRPtr (struct _Unwind_Context *context, int index, void *p)
+{
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ if (_Unwind_IsExtendedContext (context))
+ context->by_value[index] = 0;
+ context->reg[index] = (_Unwind_Context_Reg_Val) (_Unwind_Internal_Ptr) p;
+}
+
+/* Overwrite the saved value for register INDEX in CONTEXT with VAL. */
+
+static inline void
+_Unwind_SetGRValue (struct _Unwind_Context *context, int index,
+ _Unwind_Word val)
+{
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
+ /* Return column size may be smaller than _Unwind_Context_Reg_Val. */
+ gcc_assert (dwarf_reg_size_table[index] <= sizeof (_Unwind_Context_Reg_Val));
+
+ context->by_value[index] = 1;
+ context->reg[index] = _Unwind_Get_Unwind_Context_Reg_Val (val);
+}
+
+/* Return nonzero if register INDEX is stored by value rather than
+ by reference. */
+
+static inline int
+_Unwind_GRByValue (struct _Unwind_Context *context, int index)
+{
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ return context->by_value[index];
+}
+
+/* Retrieve the return address for CONTEXT. */
+
+inline _Unwind_Ptr
+_Unwind_GetIP (struct _Unwind_Context *context)
+{
+ return (_Unwind_Ptr) context->ra;
+}
+
+/* Retrieve the return address and flag whether that IP is before
+ or after first not yet fully executed instruction. */
+
+inline _Unwind_Ptr
+_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
+{
+ *ip_before_insn = _Unwind_IsSignalFrame (context);
+ return (_Unwind_Ptr) context->ra;
+}
+
+/* Overwrite the return address for CONTEXT with VAL. */
+
+inline void
+_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
+{
+ context->ra = (void *) val;
+}
+
+void *
+_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
+{
+ return context->lsda;
+}
+
+_Unwind_Ptr
+_Unwind_GetRegionStart (struct _Unwind_Context *context)
+{
+ return (_Unwind_Ptr) context->bases.func;
+}
+
+void *
+_Unwind_FindEnclosingFunction (void *pc)
+{
+ struct dwarf_eh_bases bases;
+ const struct dwarf_fde *fde = _Unwind_Find_FDE (pc-1, &bases);
+ if (fde)
+ return bases.func;
+ else
+ return NULL;
+}
+
+#ifndef __ia64__
+_Unwind_Ptr
+_Unwind_GetDataRelBase (struct _Unwind_Context *context)
+{
+ return (_Unwind_Ptr) context->bases.dbase;
+}
+
+_Unwind_Ptr
+_Unwind_GetTextRelBase (struct _Unwind_Context *context)
+{
+ return (_Unwind_Ptr) context->bases.tbase;
+}
+#endif
+
+#include "md-unwind-support.h"
+
+/* Extract any interesting information from the CIE for the translation
+ unit F belongs to. Return a pointer to the byte after the augmentation,
+ or NULL if we encountered an undecipherable augmentation. */
+
+static const unsigned char *
+extract_cie_info (const struct dwarf_cie *cie, struct _Unwind_Context *context,
+ _Unwind_FrameState *fs)
+{
+ const unsigned char *aug = cie->augmentation;
+ const unsigned char *p = aug + strlen ((const char *)aug) + 1;
+ const unsigned char *ret = NULL;
+ _uleb128_t utmp;
+ _sleb128_t stmp;
+
+ /* g++ v2 "eh" has pointer immediately following augmentation string,
+ so it must be handled first. */
+ if (aug[0] == 'e' && aug[1] == 'h')
+ {
+ fs->eh_ptr = read_pointer (p);
+ p += sizeof (void *);
+ aug += 2;
+ }
+
+ /* After the augmentation resp. pointer for "eh" augmentation
+ follows for CIE version >= 4 address size byte and
+ segment size byte. */
+ if (__builtin_expect (cie->version >= 4, 0))
+ {
+ if (p[0] != sizeof (void *) || p[1] != 0)
+ return NULL;
+ p += 2;
+ }
+ /* Immediately following this are the code and
+ data alignment and return address column. */
+ p = read_uleb128 (p, &utmp);
+ fs->code_align = (_Unwind_Word)utmp;
+ p = read_sleb128 (p, &stmp);
+ fs->data_align = (_Unwind_Sword)stmp;
+ if (cie->version == 1)
+ fs->retaddr_column = *p++;
+ else
+ {
+ p = read_uleb128 (p, &utmp);
+ fs->retaddr_column = (_Unwind_Word)utmp;
+ }
+ fs->lsda_encoding = DW_EH_PE_omit;
+
+ /* If the augmentation starts with 'z', then a uleb128 immediately
+ follows containing the length of the augmentation field following
+ the size. */
+ if (*aug == 'z')
+ {
+ p = read_uleb128 (p, &utmp);
+ ret = p + utmp;
+
+ fs->saw_z = 1;
+ ++aug;
+ }
+
+ /* Iterate over recognized augmentation subsequences. */
+ while (*aug != '\0')
+ {
+ /* "L" indicates a byte showing how the LSDA pointer is encoded. */
+ if (aug[0] == 'L')
+ {
+ fs->lsda_encoding = *p++;
+ aug += 1;
+ }
+
+ /* "R" indicates a byte indicating how FDE addresses are encoded. */
+ else if (aug[0] == 'R')
+ {
+ fs->fde_encoding = *p++;
+ aug += 1;
+ }
+
+ /* "P" indicates a personality routine in the CIE augmentation. */
+ else if (aug[0] == 'P')
+ {
+ _Unwind_Ptr personality;
+
+ p = read_encoded_value (context, *p, p + 1, &personality);
+ fs->personality = (_Unwind_Personality_Fn) personality;
+ aug += 1;
+ }
+
+ /* "S" indicates a signal frame. */
+ else if (aug[0] == 'S')
+ {
+ fs->signal_frame = 1;
+ aug += 1;
+ }
+
+ /* Otherwise we have an unknown augmentation string.
+ Bail unless we saw a 'z' prefix. */
+ else
+ return ret;
+ }
+
+ return ret ? ret : p;
+}
+
+
+/* Decode a DW_OP stack program. Return the top of stack. Push INITIAL
+ onto the stack to start. */
+
+static _Unwind_Word
+execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end,
+ struct _Unwind_Context *context, _Unwind_Word initial)
+{
+ _Unwind_Word stack[64]; /* ??? Assume this is enough. */
+ int stack_elt;
+
+ stack[0] = initial;
+ stack_elt = 1;
+
+ while (op_ptr < op_end)
+ {
+ enum dwarf_location_atom op = *op_ptr++;
+ _Unwind_Word result;
+ _uleb128_t reg, utmp;
+ _sleb128_t offset, stmp;
+
+ switch (op)
+ {
+ case DW_OP_lit0:
+ case DW_OP_lit1:
+ case DW_OP_lit2:
+ case DW_OP_lit3:
+ case DW_OP_lit4:
+ case DW_OP_lit5:
+ case DW_OP_lit6:
+ case DW_OP_lit7:
+ case DW_OP_lit8:
+ case DW_OP_lit9:
+ case DW_OP_lit10:
+ case DW_OP_lit11:
+ case DW_OP_lit12:
+ case DW_OP_lit13:
+ case DW_OP_lit14:
+ case DW_OP_lit15:
+ case DW_OP_lit16:
+ case DW_OP_lit17:
+ case DW_OP_lit18:
+ case DW_OP_lit19:
+ case DW_OP_lit20:
+ case DW_OP_lit21:
+ case DW_OP_lit22:
+ case DW_OP_lit23:
+ case DW_OP_lit24:
+ case DW_OP_lit25:
+ case DW_OP_lit26:
+ case DW_OP_lit27:
+ case DW_OP_lit28:
+ case DW_OP_lit29:
+ case DW_OP_lit30:
+ case DW_OP_lit31:
+ result = op - DW_OP_lit0;
+ break;
+
+ case DW_OP_addr:
+ result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr);
+ op_ptr += sizeof (void *);
+ break;
+
+ case DW_OP_GNU_encoded_addr:
+ {
+ _Unwind_Ptr presult;
+ op_ptr = read_encoded_value (context, *op_ptr, op_ptr+1, &presult);
+ result = presult;
+ }
+ break;
+
+ case DW_OP_const1u:
+ result = read_1u (op_ptr);
+ op_ptr += 1;
+ break;
+ case DW_OP_const1s:
+ result = read_1s (op_ptr);
+ op_ptr += 1;
+ break;
+ case DW_OP_const2u:
+ result = read_2u (op_ptr);
+ op_ptr += 2;
+ break;
+ case DW_OP_const2s:
+ result = read_2s (op_ptr);
+ op_ptr += 2;
+ break;
+ case DW_OP_const4u:
+ result = read_4u (op_ptr);
+ op_ptr += 4;
+ break;
+ case DW_OP_const4s:
+ result = read_4s (op_ptr);
+ op_ptr += 4;
+ break;
+ case DW_OP_const8u:
+ result = read_8u (op_ptr);
+ op_ptr += 8;
+ break;
+ case DW_OP_const8s:
+ result = read_8s (op_ptr);
+ op_ptr += 8;
+ break;
+ case DW_OP_constu:
+ op_ptr = read_uleb128 (op_ptr, &utmp);
+ result = (_Unwind_Word)utmp;
+ break;
+ case DW_OP_consts:
+ op_ptr = read_sleb128 (op_ptr, &stmp);
+ result = (_Unwind_Sword)stmp;
+ break;
+
+ case DW_OP_reg0:
+ 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) + (_Unwind_Word)offset;
+ break;
+
+ case DW_OP_dup:
+ gcc_assert (stack_elt);
+ result = stack[stack_elt - 1];
+ break;
+
+ case DW_OP_drop:
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
+ goto no_push;
+
+ case DW_OP_pick:
+ offset = *op_ptr++;
+ gcc_assert (offset < stack_elt - 1);
+ result = stack[stack_elt - 1 - offset];
+ break;
+
+ case DW_OP_over:
+ gcc_assert (stack_elt >= 2);
+ result = stack[stack_elt - 2];
+ break;
+
+ case DW_OP_swap:
+ {
+ _Unwind_Word t;
+ gcc_assert (stack_elt >= 2);
+ t = stack[stack_elt - 1];
+ stack[stack_elt - 1] = stack[stack_elt - 2];
+ stack[stack_elt - 2] = t;
+ goto no_push;
+ }
+
+ case DW_OP_rot:
+ {
+ _Unwind_Word t1, t2, t3;
+
+ gcc_assert (stack_elt >= 3);
+ 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. */
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
+
+ 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:
+ gcc_unreachable ();
+ }
+ }
+ 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 += (_Unwind_Word)utmp;
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ 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_shl:
+ case DW_OP_shr:
+ case DW_OP_shra:
+ case DW_OP_xor:
+ 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;
+ gcc_assert (stack_elt >= 2);
+ stack_elt -= 2;
+
+ 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 = second % 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) second <= (_Unwind_Sword) first;
+ break;
+ case DW_OP_ge:
+ result = (_Unwind_Sword) second >= (_Unwind_Sword) first;
+ break;
+ case DW_OP_eq:
+ result = (_Unwind_Sword) second == (_Unwind_Sword) first;
+ break;
+ case DW_OP_lt:
+ result = (_Unwind_Sword) second < (_Unwind_Sword) first;
+ break;
+ case DW_OP_gt:
+ result = (_Unwind_Sword) second > (_Unwind_Sword) first;
+ break;
+ case DW_OP_ne:
+ result = (_Unwind_Sword) second != (_Unwind_Sword) first;
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ }
+ break;
+
+ case DW_OP_skip:
+ offset = read_2s (op_ptr);
+ op_ptr += 2;
+ op_ptr += offset;
+ goto no_push;
+
+ case DW_OP_bra:
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
+
+ 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:
+ gcc_unreachable ();
+ }
+
+ /* Most things push a result value. */
+ gcc_assert ((size_t) stack_elt < sizeof(stack)/sizeof(*stack));
+ stack[stack_elt++] = result;
+ no_push:;
+ }
+
+ /* We were executing this program to get a value. It should be
+ at top of stack. */
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
+ return stack[stack_elt];
+}
+
+
+/* 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.
+ In signal frames, return address is after last completed instruction,
+ so we add 1 to return address to make the comparison <=. */
+ while (insn_ptr < insn_end
+ && fs->pc < context->ra + _Unwind_IsSignalFrame (context))
+ {
+ unsigned char insn = *insn_ptr++;
+ _uleb128_t reg, utmp;
+ _sleb128_t 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;
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ 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;
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ 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;
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ 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, ®);
+ /* FIXME, this is wrong; the CIE might have said that the
+ register was saved somewhere. */
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ fs->regs.reg[reg].how = REG_UNSAVED;
+ break;
+
+ case DW_CFA_same_value:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ fs->regs.reg[reg].how = REG_UNSAVED;
+ break;
+
+ case DW_CFA_undefined:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ fs->regs.reg[reg].how = REG_UNDEFINED;
+ break;
+
+ case DW_CFA_nop:
+ break;
+
+ case DW_CFA_register:
+ {
+ _uleb128_t reg2;
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ insn_ptr = read_uleb128 (insn_ptr, ®2);
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ fs->regs.reg[reg].how = REG_SAVED_REG;
+ fs->regs.reg[reg].loc.reg = (_Unwind_Word)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 = 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;
+ 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, &utmp);
+ fs->regs.cfa_reg = (_Unwind_Word)utmp;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->regs.cfa_offset = (_Unwind_Word)utmp;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ break;
+
+ case DW_CFA_def_cfa_register:
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->regs.cfa_reg = (_Unwind_Word)utmp;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ break;
+
+ case DW_CFA_def_cfa_offset:
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->regs.cfa_offset = utmp;
+ /* cfa_how deliberately not set. */
+ break;
+
+ case DW_CFA_def_cfa_expression:
+ fs->regs.cfa_exp = insn_ptr;
+ fs->regs.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, ®);
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ 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;
+
+ /* Dwarf3. */
+ case DW_CFA_offset_extended_sf:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ offset = stmp * fs->data_align;
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ 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, &utmp);
+ fs->regs.cfa_reg = (_Unwind_Word)utmp;
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ fs->regs.cfa_offset = (_Unwind_Sword)stmp;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
+ fs->regs.cfa_offset *= fs->data_align;
+ break;
+
+ case DW_CFA_def_cfa_offset_sf:
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ fs->regs.cfa_offset = (_Unwind_Sword)stmp;
+ fs->regs.cfa_offset *= fs->data_align;
+ /* cfa_how deliberately not set. */
+ break;
+
+ case DW_CFA_val_offset:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ offset = (_Unwind_Sword) utmp * fs->data_align;
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ fs->regs.reg[reg].how = REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ }
+ break;
+
+ case DW_CFA_val_offset_sf:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ offset = stmp * fs->data_align;
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ fs->regs.reg[reg].how = REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ }
+ break;
+
+ case DW_CFA_val_expression:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ fs->regs.reg[reg].how = REG_SAVED_VAL_EXP;
+ fs->regs.reg[reg].loc.exp = insn_ptr;
+ }
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ insn_ptr += utmp;
+ break;
+
+ case DW_CFA_GNU_window_save:
+ /* ??? Hardcoded for SPARC register window configuration. */
+ if (__LIBGCC_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 *);
+ }
+ break;
+
+ case DW_CFA_GNU_args_size:
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ context->args_size = (_Unwind_Word)utmp;
+ 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;
+ reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
+ if (UNWIND_COLUMN_IN_RANGE (reg))
+ {
+ fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = -offset;
+ }
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ }
+}
+
+/* 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)
+{
+ const struct dwarf_fde *fde;
+ const struct dwarf_cie *cie;
+ const unsigned char *aug, *insn, *end;
+
+ memset (fs, 0, sizeof (*fs));
+ context->args_size = 0;
+ context->lsda = 0;
+
+ if (context->ra == 0)
+ return _URC_END_OF_STACK;
+
+ fde = _Unwind_Find_FDE (context->ra + _Unwind_IsSignalFrame (context) - 1,
+ &context->bases);
+ if (fde == NULL)
+ {
+#ifdef MD_FALLBACK_FRAME_STATE_FOR
+ /* 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. */
+ return MD_FALLBACK_FRAME_STATE_FOR (context, fs);
+#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 = (const unsigned char *) next_fde ((const struct dwarf_fde *) cie);
+ execute_cfa_program (insn, end, context, fs);
+
+ /* Locate augmentation for the fde. */
+ aug = (const unsigned char *) fde + sizeof (*fde);
+ aug += 2 * size_of_encoded_value (fs->fde_encoding);
+ insn = NULL;
+ if (fs->saw_z)
+ {
+ _uleb128_t 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 = (const 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;
+
+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. */
+
+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));
+ if (!ASSUME_EXTENDED_UNWIND_CONTEXT)
+ context.flags = EXTENDED_CONTEXT_BIT;
+ 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.regs.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.regs.cfa_offset;
+ state_in->cfa_reg = fs.regs.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;
+}
+
+typedef union { _Unwind_Ptr ptr; _Unwind_Word word; } _Unwind_SpTmp;
+
+static inline void
+_Unwind_SetSpColumn (struct _Unwind_Context *context, void *cfa,
+ _Unwind_SpTmp *tmp_sp)
+{
+ int size = dwarf_reg_size_table[__builtin_dwarf_sp_column ()];
+
+ if (size == sizeof(_Unwind_Ptr))
+ tmp_sp->ptr = (_Unwind_Ptr) cfa;
+ else
+ {
+ gcc_assert (size == sizeof(_Unwind_Word));
+ tmp_sp->word = (_Unwind_Ptr) cfa;
+ }
+ _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), tmp_sp);
+}
+
+static void
+uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+ struct _Unwind_Context orig_context = *context;
+ void *cfa;
+ long i;
+
+#ifdef __LIBGCC_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_SpTmp tmp_sp;
+
+ if (!_Unwind_GetGRPtr (&orig_context, __builtin_dwarf_sp_column ()))
+ _Unwind_SetSpColumn (&orig_context, context->cfa, &tmp_sp);
+ _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), NULL);
+#endif
+
+ /* Compute this frame's CFA. */
+ switch (fs->regs.cfa_how)
+ {
+ case CFA_REG_OFFSET:
+ cfa = _Unwind_GetPtr (&orig_context, fs->regs.cfa_reg);
+ cfa += fs->regs.cfa_offset;
+ break;
+
+ case CFA_EXP:
+ {
+ const unsigned char *exp = fs->regs.cfa_exp;
+ _uleb128_t len;
+
+ exp = read_uleb128 (exp, &len);
+ cfa = (void *) (_Unwind_Ptr)
+ execute_stack_op (exp, exp + len, &orig_context, 0);
+ break;
+ }
+
+ default:
+ gcc_unreachable ();
+ }
+ context->cfa = cfa;
+
+ /* Compute the addresses of all registers saved in this frame. */
+ for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__ + 1; ++i)
+ switch (fs->regs.reg[i].how)
+ {
+ case REG_UNSAVED:
+ case REG_UNDEFINED:
+ break;
+
+ case REG_SAVED_OFFSET:
+ _Unwind_SetGRPtr (context, i,
+ (void *) (cfa + fs->regs.reg[i].loc.offset));
+ break;
+
+ case REG_SAVED_REG:
+ if (_Unwind_GRByValue (&orig_context, fs->regs.reg[i].loc.reg))
+ _Unwind_SetGRValue (context, i,
+ _Unwind_GetGR (&orig_context,
+ fs->regs.reg[i].loc.reg));
+ else
+ _Unwind_SetGRPtr (context, i,
+ _Unwind_GetGRPtr (&orig_context,
+ fs->regs.reg[i].loc.reg));
+ break;
+
+ case REG_SAVED_EXP:
+ {
+ const unsigned char *exp = fs->regs.reg[i].loc.exp;
+ _uleb128_t len;
+ _Unwind_Ptr val;
+
+ exp = read_uleb128 (exp, &len);
+ val = execute_stack_op (exp, exp + len, &orig_context,
+ (_Unwind_Ptr) cfa);
+ _Unwind_SetGRPtr (context, i, (void *) val);
+ }
+ break;
+
+ case REG_SAVED_VAL_OFFSET:
+ _Unwind_SetGRValue (context, i,
+ (_Unwind_Internal_Ptr)
+ (cfa + fs->regs.reg[i].loc.offset));
+ break;
+
+ case REG_SAVED_VAL_EXP:
+ {
+ const unsigned char *exp = fs->regs.reg[i].loc.exp;
+ _uleb128_t len;
+ _Unwind_Ptr val;
+
+ exp = read_uleb128 (exp, &len);
+ val = execute_stack_op (exp, exp + len, &orig_context,
+ (_Unwind_Ptr) cfa);
+ _Unwind_SetGRValue (context, i, val);
+ }
+ break;
+ }
+
+ _Unwind_SetSignalFrame (context, fs->signal_frame);
+
+#ifdef MD_FROB_UPDATE_CONTEXT
+ MD_FROB_UPDATE_CONTEXT (context, fs);
+#endif
+}
+
+/* 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);
+
+ /* In general this unwinder doesn't make any distinction between
+ undefined and same_value rule. Call-saved registers are assumed
+ to have same_value rule by default and explicit undefined
+ rule is handled like same_value. The only exception is
+ DW_CFA_undefined on retaddr_column which is supposed to
+ mark outermost frame in DWARF 3. */
+ if (fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (fs->retaddr_column)].how
+ == REG_UNDEFINED)
+ /* uw_frame_state_for uses context->ra == 0 check to find outermost
+ stack frame. */
+ context->ra = 0;
+ else
+ /* Compute the return address now, since the return address column
+ can change from frame to frame. */
+ context->ra = __builtin_extract_return_addr
+ (_Unwind_GetPtr (context, fs->retaddr_column));
+}
+
+static void
+uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+ uw_update_context (context, fs);
+}
+
+/* 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 inline void
+init_dwarf_reg_size_table (void)
+{
+ __builtin_init_dwarf_reg_size_table (dwarf_reg_size_table);
+}
+
+static void __attribute__((noinline))
+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_SpTmp sp_slot;
+ _Unwind_Reason_Code code;
+
+ memset (context, 0, sizeof (struct _Unwind_Context));
+ context->ra = ra;
+ if (!ASSUME_EXTENDED_UNWIND_CONTEXT)
+ context->flags = EXTENDED_CONTEXT_BIT;
+
+ code = uw_frame_state_for (context, &fs);
+ gcc_assert (code == _URC_NO_REASON);
+
+#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
+
+ /* Force the frame state to use the known cfa value. */
+ _Unwind_SetSpColumn (context, outer_cfa, &sp_slot);
+ fs.regs.cfa_how = CFA_REG_OFFSET;
+ fs.regs.cfa_reg = __builtin_dwarf_sp_column ();
+ fs.regs.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);
+}
+
+static void _Unwind_DebugHook (void *, void *)
+ __attribute__ ((__noinline__, __used__, __noclone__));
+
+/* This function is called during unwinding. It is intended as a hook
+ for a debugger to intercept exceptions. CFA is the CFA of the
+ target frame. HANDLER is the PC to which control will be
+ transferred. */
+static void
+_Unwind_DebugHook (void *cfa __attribute__ ((__unused__)),
+ void *handler __attribute__ ((__unused__)))
+{
+ /* We only want to use stap probes starting with v3. Earlier
+ versions added too much startup cost. */
+#if defined (HAVE_SYS_SDT_H) && defined (STAP_PROBE2) && _SDT_NOTE_TYPE >= 3
+ STAP_PROBE2 (libgcc, unwind, cfa, handler);
+#else
+ asm ("");
+#endif
+}
+
+/* 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); \
+ _Unwind_DebugHook ((TARGET)->cfa, handler); \
+ __builtin_eh_return (offset, handler); \
+ } \
+ while (0)
+
+static long
+uw_install_context_1 (struct _Unwind_Context *current,
+ struct _Unwind_Context *target)
+{
+ long i;
+ _Unwind_SpTmp sp_slot;
+
+ /* If the target frame does not have a saved stack pointer,
+ then set up the target's CFA. */
+ if (!_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ()))
+ _Unwind_SetSpColumn (target, target->cfa, &sp_slot);
+
+ for (i = 0; i < __LIBGCC_DWARF_FRAME_REGISTERS__; ++i)
+ {
+ void *c = (void *) (_Unwind_Internal_Ptr) current->reg[i];
+ void *t = (void *) (_Unwind_Internal_Ptr)target->reg[i];
+
+ gcc_assert (current->by_value[i] == 0);
+ if (target->by_value[i] && c)
+ {
+ _Unwind_Word w;
+ _Unwind_Ptr p;
+ if (dwarf_reg_size_table[i] == sizeof (_Unwind_Word))
+ {
+ w = (_Unwind_Internal_Ptr) t;
+ memcpy (c, &w, sizeof (_Unwind_Word));
+ }
+ else
+ {
+ gcc_assert (dwarf_reg_size_table[i] == sizeof (_Unwind_Ptr));
+ p = (_Unwind_Internal_Ptr) t;
+ memcpy (c, &p, sizeof (_Unwind_Ptr));
+ }
+ }
+ else if (t && c && t != c)
+ memcpy (c, t, dwarf_reg_size_table[i]);
+ }
+
+ /* If the current frame doesn't have a saved stack pointer, then we
+ need to rely on EH_RETURN_STACKADJ_RTX to get our target stack
+ pointer value reloaded. */
+ if (!_Unwind_GetGRPtr (current, __builtin_dwarf_sp_column ()))
+ {
+ void *target_cfa;
+
+ target_cfa = _Unwind_GetPtr (target, __builtin_dwarf_sp_column ());
+
+ /* We adjust SP by the difference between CURRENT and TARGET's CFA. */
+ if (__LIBGCC_STACK_GROWS_DOWNWARD__)
+ return target_cfa - current->cfa + target->args_size;
+ else
+ return current->cfa - target_cfa - target->args_size;
+ }
+ return 0;
+}
+
+static inline _Unwind_Ptr
+uw_identify_context (struct _Unwind_Context *context)
+{
+ /* The CFA is not sufficient to disambiguate the context of a function
+ interrupted by a signal before establishing its frame and the context
+ of the signal itself. */
+ if (__LIBGCC_STACK_GROWS_DOWNWARD__)
+ return _Unwind_GetCFA (context) - _Unwind_IsSignalFrame (context);
+ else
+ return _Unwind_GetCFA (context) + _Unwind_IsSignalFrame (context);
+}
+
+
+#include "unwind.inc"
+
+#if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS)
+alias (_Unwind_Backtrace);
+alias (_Unwind_DeleteException);
+alias (_Unwind_FindEnclosingFunction);
+alias (_Unwind_ForcedUnwind);
+alias (_Unwind_GetDataRelBase);
+alias (_Unwind_GetTextRelBase);
+alias (_Unwind_GetCFA);
+alias (_Unwind_GetGR);
+alias (_Unwind_GetIP);
+alias (_Unwind_GetLanguageSpecificData);
+alias (_Unwind_GetRegionStart);
+alias (_Unwind_RaiseException);
+alias (_Unwind_Resume);
+alias (_Unwind_Resume_or_Rethrow);
+alias (_Unwind_SetGR);
+alias (_Unwind_SetIP);
+#endif
+
+#endif /* !USING_SJLJ_EXCEPTIONS */
We need customized EH unwinder support for AArch64 DWARF operations introduced earlier in this patchset, these changes mostly need to be done in the generic file unwind-dw2.c. There are two ways of introducing these AArch64 support: * Introducing a few target macros so we can customize functions like uw_init_context, uw_install_context etc. * Use target private unwind-dw2 implementation, i.e duplicate the generic unwind-dw2.c into target config directory and use it instead of generic one. This is current used by IA64 and CR16 is using. I am not sure which approach is the convention in libgcc, Ian, any comments on this? Thanks. This patch is the start of using approach 2 includes necessary Makefile support and copying of original unwind-dw2.c. A follow up patch will implement those AArch64 specific stuff so the change will be very clear. OK for trunk? libgcc/ 2016-11-11 Jiong Wang<jiong.wang@arm.com> * config.host (aarch64*-*-elf, aarch64*-*-rtems*, aarch64*-*-linux*): Include new AArch64 EH makefile. * config/aarch64/t-eh-aarch64: New EH makefile. * config/aarch64/unwind-aarch64.c: New EH unwinder implementation, copied from unwind-dw2.c.