--- /dev/null
+/* Stack unwinding code based on dwarf2 frame info for GDB, the GNU debugger.
+ Copyright 2001
+ Free Software Foundation, Inc.
+ Contributed by Jiri Smid, SuSE Labs.
+
+ This file is part of GDB.
+
+ This program 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 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "symtab.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "target.h"
+#include "elf/dwarf2.h"
+#include "inferior.h"
+#include "regcache.h"
+#include "dwarf2cfi.h"
+
+/* Common Information Entry - holds information that is shared among many
+ Frame Descriptors. */
+struct cie_unit
+{
+ /* Offset of this unit in dwarf_frame_buffer. */
+ ULONGEST offset;
+
+ /* A null-terminated string that identifies the augmentation to this CIE or
+ to the FDEs that use it. */
+ char *augmentation;
+
+ /* A constant that is factored out of all advance location instructions. */
+ unsigned int code_align;
+
+ /* A constant that is factored out of all offset instructions. */
+ int data_align;
+
+ /* A constant that indicates which regiter represents the return address
+ of a function. */
+ unsigned char ra;
+
+ /* Indicates how addresses are encoded. */
+ unsigned char addr_encoding;
+
+ /* Pointer and length of the cie program. */
+ char *data;
+ unsigned int data_length;
+
+ struct objfile *objfile;
+
+ /* Next in chain. */
+ struct cie_unit *next;
+};
+
+/* Frame Description Entry. */
+struct fde_unit
+{
+ /* Address of the first location associated with this entry. */
+ CORE_ADDR initial_location;
+
+ /* Length of program section described by this entry. */
+ CORE_ADDR address_range;
+
+ /* Pointer to asociated CIE. */
+ struct cie_unit *cie_ptr;
+
+ /* Pointer and length of the cie program. */
+ char *data;
+ unsigned int data_length;
+};
+
+struct fde_array
+{
+ struct fde_unit **array;
+ int elems;
+ int array_size;
+};
+
+struct context_reg
+{
+ union
+ {
+ unsigned int reg;
+ long offset;
+ CORE_ADDR addr;
+ }
+ loc;
+ enum
+ {
+ REG_CTX_UNSAVED,
+ REG_CTX_SAVED_OFFSET,
+ REG_CTX_SAVED_REG,
+ REG_CTX_SAVED_ADDR,
+ REG_CTX_VALUE,
+ }
+ how;
+};
+
+/* This is the register and unwind state for a particular frame. */
+struct context
+{
+ struct context_reg *reg;
+
+ CORE_ADDR cfa;
+ CORE_ADDR ra;
+ void *lsda;
+ int args_size;
+};
+
+struct frame_state_reg
+{
+ union
+ {
+ unsigned int reg;
+ long offset;
+ unsigned char *exp;
+ }
+ loc;
+ enum
+ {
+ REG_UNSAVED,
+ REG_SAVED_OFFSET,
+ REG_SAVED_REG,
+ REG_SAVED_EXP,
+ }
+ how;
+};
+
+struct frame_state
+{
+ /* Each register save state can be described in terms of a CFA slot,
+ another register, or a location expression. */
+ struct frame_state_regs
+ {
+ struct frame_state_reg *reg;
+
+ /* Used to implement DW_CFA_remember_state. */
+ struct frame_state_regs *prev;
+ }
+ regs;
+
+ /* The CFA can be described in terms of a reg+offset or a
+ location expression. */
+ long cfa_offset;
+ int cfa_reg;
+ unsigned char *cfa_exp;
+ enum
+ {
+ CFA_UNSET,
+ CFA_REG_OFFSET,
+ CFA_EXP,
+ }
+ cfa_how;
+
+ /* The PC described by the current frame state. */
+ CORE_ADDR pc;
+
+ /* The information we care about from the CIE/FDE. */
+ int data_align;
+ unsigned int code_align;
+ unsigned char retaddr_column;
+ unsigned char addr_encoding;
+
+ struct objfile *objfile;
+};
+
+#define UNWIND_CONTEXT(fi) ((struct context *) (fi->context))
+\f
+
+static struct cie_unit *cie_chunks;
+static struct fde_array fde_chunks;
+/* Obstack for allocating temporary storage used during unwind operations. */
+static struct obstack unwind_tmp_obstack;
+
+extern file_ptr dwarf_frame_offset;
+extern unsigned int dwarf_frame_size;
+extern file_ptr dwarf_eh_frame_offset;
+extern unsigned int dwarf_eh_frame_size;
+
+static char *dwarf_frame_buffer;
+\f
+
+extern char *dwarf2_read_section (struct objfile *objfile, file_ptr offset,
+ unsigned int size);
+
+static struct fde_unit *fde_unit_alloc (void);
+static struct cie_unit *cie_unit_alloc (void);
+static void fde_chunks_need_space ();
+
+static struct context *context_alloc ();
+static struct frame_state *frame_state_alloc ();
+static void unwind_tmp_obstack_free ();
+static void context_cpy (struct context *dst, struct context *src);
+
+static unsigned int read_1u (bfd *abfd, char **p);
+static int read_1s (bfd *abfd, char **p);
+static unsigned int read_2u (bfd *abfd, char **p);
+static int read_2s (bfd *abfd, char **p);
+static unsigned int read_4u (bfd *abfd, char **p);
+static int read_4s (bfd *abfd, char **p);
+static ULONGEST read_8u (bfd *abfd, char **p);
+static LONGEST read_8s (bfd *abfd, char **p);
+
+static ULONGEST read_uleb128 (bfd *abfd, char **p);
+static LONGEST read_sleb128 (bfd *abfd, char **p);
+static CORE_ADDR read_pointer (bfd *abfd, char **p);
+static CORE_ADDR read_encoded_pointer (bfd *abfd, char **p,
+ unsigned char encoding);
+
+static LONGEST read_initial_length (bfd *abfd, char *buf, int *bytes_read);
+static ULONGEST read_length (bfd *abfd, char *buf, int *bytes_read,
+ int dwarf64);
+static ULONGEST read_address (bfd *abfd, char **p);
+
+
+static int is_cie (ULONGEST cie_id, int dwarf64);
+static int compare_fde_unit (const void *a, const void *b);
+void dwarf2_build_frame_info (struct objfile *objfile);
+
+static void execute_cfa_program (struct objfile *objfile, char *insn_ptr,
+ char *insn_end, struct context *context,
+ struct frame_state *fs);
+static struct fde_unit *get_fde_for_addr (CORE_ADDR pc);
+static void frame_state_for (struct context *context, struct frame_state *fs);
+static void get_reg (char *reg, struct context *context, int regnum);
+static CORE_ADDR execute_stack_op (struct objfile *objfile,
+ char *op_ptr, char *op_end,
+ struct context *context, CORE_ADDR initial);
+static void update_context (struct context *context, struct frame_state *fs,
+ int chain);
+
+\f
+/* Memory allocation functions. */
+static struct fde_unit *
+fde_unit_alloc (void)
+{
+ struct fde_unit *fde;
+
+ fde = (struct fde_unit *) xmalloc (sizeof (struct fde_unit));
+ memset (fde, 0, sizeof (struct fde_unit));
+ return fde;
+}
+
+static struct cie_unit *
+cie_unit_alloc (void)
+{
+ struct cie_unit *cie;
+
+ cie = (struct cie_unit *) xmalloc (sizeof (struct cie_unit));
+ memset (cie, 0, sizeof (struct cie_unit));
+ return cie;
+}
+
+static void
+fde_chunks_need_space ()
+{
+ if (fde_chunks.elems < fde_chunks.array_size)
+ return;
+ fde_chunks.array_size =
+ fde_chunks.array_size ? 2 * fde_chunks.array_size : 1024;
+ fde_chunks.array =
+ xrealloc (fde_chunks.array,
+ sizeof (struct fde_unit) * fde_chunks.array_size);
+}
+
+/* Alocate a new `struct context' on temporary obstack. */
+static struct context *
+context_alloc ()
+{
+ struct context *context;
+ struct context_reg *reg;
+ int regs_size = sizeof (struct context_reg) * NUM_REGS;
+
+ context = (struct context *) obstack_alloc (&unwind_tmp_obstack,
+ sizeof (struct context));
+ memset (context, 0, sizeof (struct context));
+ context->reg = (struct context_reg *) obstack_alloc (&unwind_tmp_obstack,
+ regs_size);
+ memset (context->reg, 0, regs_size);
+ return context;
+}
+
+/* Alocate a new `struct frame_state' on temporary obstack. */
+static struct frame_state *
+frame_state_alloc ()
+{
+ struct frame_state *fs;
+ struct frame_state_reg *reg;
+ int regs_size = sizeof (struct frame_state_reg) * NUM_REGS;
+
+ fs = (struct frame_state *) obstack_alloc (&unwind_tmp_obstack,
+ sizeof (struct frame_state));
+ memset (fs, 0, sizeof (struct frame_state));
+ fs->regs.reg = (struct frame_state_reg *) obstack_alloc (&unwind_tmp_obstack,
+ regs_size);
+ memset (fs->regs.reg, 0, regs_size);
+ return fs;
+}
+
+static void
+unwind_tmp_obstack_free ()
+{
+ obstack_free (&unwind_tmp_obstack, NULL);
+ obstack_init (&unwind_tmp_obstack);
+}
+
+static void
+context_cpy (struct context *dst, struct context *src)
+{
+ struct context_reg *reg = dst->reg;
+ int regs_size = sizeof (struct context_reg) * NUM_REGS;
+
+ *dst = *src;
+ memcpy (dst->reg, src->reg, regs_size);
+}
+\f
+
+static unsigned int
+read_1u (bfd *abfd, char **p)
+{
+ unsigned ret;
+
+ ret= bfd_get_8 (abfd, (bfd_byte *) *p);
+ (*p) ++;
+ return ret;
+}
+
+static int
+read_1s (bfd *abfd, char **p)
+{
+ int ret;
+
+ ret= bfd_get_signed_8 (abfd, (bfd_byte *) *p);
+ (*p) ++;
+ return ret;
+}
+
+static unsigned int
+read_2u (bfd *abfd, char **p)
+{
+ unsigned ret;
+
+ ret= bfd_get_16 (abfd, (bfd_byte *) *p);
+ (*p) ++;
+ return ret;
+}
+
+static int
+read_2s (bfd *abfd, char **p)
+{
+ int ret;
+
+ ret= bfd_get_signed_16 (abfd, (bfd_byte *) *p);
+ (*p) += 2;
+ return ret;
+}
+
+static unsigned int
+read_4u (bfd *abfd, char **p)
+{
+ unsigned int ret;
+
+ ret= bfd_get_32 (abfd, (bfd_byte *) *p);
+ (*p) += 4;
+ return ret;
+}
+
+static int
+read_4s (bfd *abfd, char **p)
+{
+ int ret;
+
+ ret= bfd_get_signed_32 (abfd, (bfd_byte *) *p);
+ (*p) += 4;
+ return ret;
+}
+
+static ULONGEST
+read_8u (bfd *abfd, char **p)
+{
+ ULONGEST ret;
+
+ ret = bfd_get_64 (abfd, (bfd_byte *) *p);
+ (*p) += 8;
+ return ret;
+}
+
+static LONGEST
+read_8s (bfd *abfd, char **p)
+{
+ LONGEST ret;
+
+ ret = bfd_get_signed_64 (abfd, (bfd_byte *) *p);
+ (*p) += 8;
+ return ret;
+}
+
+static ULONGEST
+read_uleb128 (bfd *abfd, char **p)
+{
+ ULONGEST ret;
+ int i, shift;
+ unsigned char byte;
+
+ ret = 0;
+ shift = 0;
+ i = 0;
+ while (1)
+ {
+ byte = bfd_get_8 (abfd, (bfd_byte *) *p);
+ (*p) ++;
+ ret |= ((unsigned long) (byte & 127) << shift);
+ if ((byte & 128) == 0)
+ {
+ break;
+ }
+ shift += 7;
+ }
+ return ret;
+}
+
+static LONGEST
+read_sleb128 (bfd *abfd, char **p)
+{
+ LONGEST ret;
+ int i, shift, size, num_read;
+ unsigned char byte;
+
+ ret = 0;
+ shift = 0;
+ size = 32;
+ num_read = 0;
+ i = 0;
+ while (1)
+ {
+ byte = bfd_get_8 (abfd, (bfd_byte *) *p);
+ (*p) ++;
+ ret |= ((long) (byte & 127) << shift);
+ shift += 7;
+ if ((byte & 128) == 0)
+ {
+ break;
+ }
+ }
+ if ((shift < size) && (byte & 0x40))
+ {
+ ret |= -(1 << shift);
+ }
+ return ret;
+}
+
+static CORE_ADDR
+read_pointer (bfd *abfd, char **p)
+{
+ switch (TARGET_ADDR_BIT / TARGET_CHAR_BIT)
+ {
+ case 4:
+ return read_4u (abfd, p);
+ case 8:
+ return read_8u (abfd, p);
+ default:
+ error ("dwarf cfi error: unsupported target address length.");
+ }
+}
+
+static CORE_ADDR
+read_encoded_pointer (bfd *abfd, char **p, unsigned char encoding)
+{
+ CORE_ADDR ret;
+
+ switch (encoding & 0x0f)
+ {
+ case DW_EH_PE_absptr:
+ ret = read_pointer (abfd, p);
+ break;
+
+ case DW_EH_PE_uleb128:
+ ret = read_uleb128 (abfd, p);
+ break;
+ case DW_EH_PE_sleb128:
+ ret = read_sleb128 (abfd, p);
+ break;
+
+ case DW_EH_PE_udata2:
+ ret = read_2u (abfd, p);
+ break;
+ case DW_EH_PE_udata4:
+ ret = read_4u (abfd, p);
+ break;
+ case DW_EH_PE_udata8:
+ ret = read_8u (abfd, p);
+ break;
+
+ case DW_EH_PE_sdata2:
+ ret = read_2s (abfd, p);
+ break;
+ case DW_EH_PE_sdata4:
+ ret = read_4s (abfd, p);
+ break;
+ case DW_EH_PE_sdata8:
+ ret = read_8s (abfd, p);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ "read_encoded_pointer: unknown pointer encoding");
+ }
+
+ if (ret != 0)
+ switch (encoding & 0xf0)
+ {
+ case DW_EH_PE_absptr:
+ break;
+ case DW_EH_PE_pcrel:
+ ret += (CORE_ADDR) *p;
+ break;
+ case DW_EH_PE_textrel:
+ case DW_EH_PE_datarel:
+ case DW_EH_PE_funcrel:
+ default:
+ internal_error (__FILE__, __LINE__,
+ "read_encoded_pointer: unknown pointer encoding");
+ }
+
+ return ret;
+}
+
+static LONGEST
+read_initial_length (bfd * abfd, char *buf, int *bytes_read)
+{
+ LONGEST ret = 0;
+
+ ret = bfd_get_32 (abfd, (bfd_byte *) buf);
+
+ if (ret == 0xffffffff)
+ {
+ ret = bfd_get_64 (abfd, (bfd_byte *) buf + 4);
+ *bytes_read = 12;
+ }
+ else
+ {
+ *bytes_read = 4;
+ }
+
+ return ret;
+}
+
+static ULONGEST
+read_length (bfd * abfd, char *buf, int *bytes_read, int dwarf64)
+{
+ if (dwarf64)
+ {
+ *bytes_read = 8;
+ return read_8u (abfd, &buf);
+ }
+ else
+ {
+ *bytes_read = 4;
+ return read_4u (abfd, &buf);
+ }
+}
+
+static void
+execute_cfa_program ( struct objfile *objfile, char *insn_ptr, char *insn_end,
+ struct context *context, struct frame_state *fs)
+{
+ struct frame_state_regs *unused_rs = NULL;
+
+ /* Don't allow remember/restore between CIE and FDE programs. */
+ fs->regs.prev = NULL;
+
+ while (insn_ptr < insn_end && fs->pc < context->ra)
+ {
+ unsigned char insn = *insn_ptr++;
+ ULONGEST reg, uoffset;
+ LONGEST offset;
+ int bytes_read;
+
+ if (insn & DW_CFA_advance_loc)
+ fs->pc += (insn & 0x3f) * fs->code_align;
+ else if (insn & DW_CFA_offset)
+ {
+ reg = insn & 0x3f;
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ offset = (long) uoffset * fs->data_align;
+ fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ }
+ else if (insn & DW_CFA_restore)
+ {
+ reg = insn & 0x3f;
+ fs->regs.reg[reg].how = REG_UNSAVED;
+ }
+ else
+ switch (insn)
+ {
+ case DW_CFA_set_loc:
+ fs->pc = read_encoded_pointer (objfile->obfd, &insn_ptr,
+ fs->addr_encoding);
+ break;
+
+ case DW_CFA_advance_loc1:
+ fs->pc += read_1u (objfile->obfd, &insn_ptr);
+ break;
+ case DW_CFA_advance_loc2:
+ fs->pc += read_2u (objfile->obfd, &insn_ptr);
+ break;
+ case DW_CFA_advance_loc4:
+ fs->pc += read_4u (objfile->obfd, &insn_ptr);
+ break;
+
+ case DW_CFA_offset_extended:
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ offset = (long) uoffset *fs->data_align;
+ fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ break;
+
+ case DW_CFA_restore_extended:
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->regs.reg[reg].how = REG_UNSAVED;
+ break;
+
+ case DW_CFA_undefined:
+ case DW_CFA_same_value:
+ case DW_CFA_nop:
+ break;
+
+ case DW_CFA_register:
+ {
+ ULONGEST reg2;
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ reg2 = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->regs.reg[reg].how = REG_SAVED_REG;
+ fs->regs.reg[reg].loc.reg = reg2;
+ }
+ break;
+
+ case DW_CFA_remember_state:
+ {
+ struct frame_state_regs *new_rs;
+ if (unused_rs)
+ {
+ new_rs = unused_rs;
+ unused_rs = unused_rs->prev;
+ }
+ else
+ new_rs = xmalloc (sizeof (struct frame_state_regs));
+
+ *new_rs = fs->regs;
+ fs->regs.prev = new_rs;
+ }
+ break;
+
+ case DW_CFA_restore_state:
+ {
+ struct frame_state_regs *old_rs = fs->regs.prev;
+ fs->regs = *old_rs;
+ old_rs->prev = unused_rs;
+ unused_rs = old_rs;
+ }
+ break;
+
+ case DW_CFA_def_cfa:
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->cfa_reg = reg;
+ fs->cfa_offset = uoffset;
+ fs->cfa_how = CFA_REG_OFFSET;
+ break;
+
+ case DW_CFA_def_cfa_register:
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->cfa_reg = reg;
+ fs->cfa_how = CFA_REG_OFFSET;
+ break;
+
+ case DW_CFA_def_cfa_offset:
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->cfa_offset = uoffset;
+ break;
+
+ case DW_CFA_def_cfa_expression:
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->cfa_exp = insn_ptr;
+ fs->cfa_how = CFA_EXP;
+ insn_ptr += uoffset;
+ break;
+
+ case DW_CFA_expression:
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->regs.reg[reg].how = REG_SAVED_EXP;
+ fs->regs.reg[reg].loc.exp = insn_ptr;
+ insn_ptr += uoffset;
+ break;
+
+ /* From the 2.1 draft. */
+ case DW_CFA_offset_extended_sf:
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ offset = read_sleb128 (objfile->obfd, &insn_ptr);
+ offset *= 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:
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ offset = read_sleb128 (objfile->obfd, &insn_ptr);
+ fs->cfa_offset = offset;
+ fs->cfa_reg = reg;
+ fs->cfa_how = CFA_REG_OFFSET;
+ break;
+
+ case DW_CFA_def_cfa_offset_sf:
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ fs->cfa_offset = uoffset;
+ /* cfa_how deliberately not set. */
+ break;
+
+ case DW_CFA_GNU_window_save:
+ /* ??? Hardcoded for SPARC register window configuration. */
+ 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:
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ context->args_size = uoffset;
+ break;
+
+ case DW_CFA_GNU_negative_offset_extended:
+ /* Obsoleted by DW_CFA_offset_extended_sf, but used by
+ older PowerPC code. */
+ reg = read_uleb128 (objfile->obfd, &insn_ptr);
+ uoffset = read_uleb128 (objfile->obfd, &insn_ptr);
+ offset = (long) uoffset *fs->data_align;
+ fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = -offset;
+ break;
+
+ default:
+ error ("dwarf cfi error: unknown cfa instruction %d.", insn);
+ }
+ }
+}
+
+static struct fde_unit *
+get_fde_for_addr (CORE_ADDR pc)
+{
+ size_t lo, hi;
+ struct fde_unit *fde = NULL;
+ lo = 0;
+ hi = fde_chunks.elems;
+
+ while (lo < hi)
+ {
+ size_t i = (lo + hi) / 2;
+ fde = fde_chunks.array[i];
+ if (pc < fde->initial_location)
+ hi = i;
+ else if (pc >= fde->initial_location + fde->address_range)
+ lo = i + 1;
+ else
+ return fde;
+ }
+ return 0;
+}
+
+static void
+frame_state_for (struct context *context, struct frame_state *fs)
+{
+ struct fde_unit *fde;
+ struct cie_unit *cie;
+ unsigned char *aug, *insn, *end;
+
+ context->args_size = 0;
+ context->lsda = 0;
+
+ if ((fde = get_fde_for_addr (context->ra - 1)) != NULL)
+ {
+ fs->pc = fde->initial_location;
+
+ cie = fde->cie_ptr;
+ fs->code_align = cie->code_align;
+ fs->data_align = cie->data_align;
+ fs->retaddr_column = cie->ra;
+ fs->addr_encoding = cie->addr_encoding;
+ fs->objfile = cie->objfile;
+
+ execute_cfa_program (cie->objfile, cie->data,
+ cie->data + cie->data_length, context, fs);
+ execute_cfa_program (cie->objfile, fde->data,
+ fde->data + fde->data_length, context, fs);
+ }
+}
+
+static void
+get_reg (char *reg, struct context *context, int regnum)
+{
+ switch (context->reg[regnum].how)
+ {
+ case REG_CTX_UNSAVED:
+ read_register_gen (regnum, reg);
+ break;
+ case REG_CTX_SAVED_OFFSET:
+ target_read_memory (context->cfa + context->reg[regnum].loc.offset,
+ reg, REGISTER_RAW_SIZE (regnum));
+ break;
+ case REG_CTX_SAVED_REG:
+ read_register_gen (context->reg[regnum].loc.reg, reg);
+ break;
+ case REG_CTX_SAVED_ADDR:
+ target_read_memory (context->reg[regnum].loc.addr,
+ reg, REGISTER_RAW_SIZE (regnum));
+ break;
+ case REG_CTX_VALUE:
+ memcpy (reg, &context->reg[regnum].loc.addr,
+ REGISTER_RAW_SIZE (regnum));
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "get_reg: unknown register rule");
+ }
+}
+
+/* Decode a DW_OP stack program. Return the top of stack. Push INITIAL
+ onto the stack to start. */
+static CORE_ADDR
+execute_stack_op (struct objfile *objfile,
+ char *op_ptr, char *op_end, struct context *context,
+ CORE_ADDR initial)
+{
+ CORE_ADDR 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++;
+ ULONGEST result, reg;
+ LONGEST offset;
+
+ 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 = read_pointer (objfile->obfd, &op_ptr);
+ break;
+
+ case DW_OP_const1u:
+ result = read_1u (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_const1s:
+ result = read_1s (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_const2u:
+ result = read_2u (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_const2s:
+ result = read_2s (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_const4u:
+ result = read_4u (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_const4s:
+ result = read_4s (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_const8u:
+ result = read_8u (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_const8s:
+ result = read_8s (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_constu:
+ result = read_uleb128 (objfile->obfd, &op_ptr);
+ break;
+ case DW_OP_consts:
+ result = read_sleb128 (objfile->obfd, &op_ptr);
+ 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:
+ get_reg ((char *) &result, context, op - DW_OP_reg0);
+ break;
+ case DW_OP_regx:
+ reg = read_uleb128 (objfile->obfd, &op_ptr);
+ get_reg ((char *) &result, 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:
+ offset = read_sleb128 (objfile->obfd, &op_ptr);
+ get_reg ((char *) &result, context, op - DW_OP_breg0);
+ result += offset;
+ break;
+ case DW_OP_bregx:
+ reg = read_uleb128 (objfile->obfd, &op_ptr);
+ offset = read_sleb128 (objfile->obfd, &op_ptr);
+ get_reg ((char *) &result, context, reg);
+ result += offset;
+ break;
+
+ case DW_OP_dup:
+ if (stack_elt < 1)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ result = stack[stack_elt - 1];
+ break;
+
+ case DW_OP_drop:
+ if (--stack_elt < 0)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ goto no_push;
+
+ case DW_OP_pick:
+ offset = *op_ptr++;
+ if (offset >= stack_elt - 1)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ result = stack[stack_elt - 1 - offset];
+ break;
+
+ case DW_OP_over:
+ if (stack_elt < 2)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ result = stack[stack_elt - 2];
+ break;
+
+ case DW_OP_rot:
+ {
+ CORE_ADDR t1, t2, t3;
+
+ if (stack_elt < 3)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ 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)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ result = stack[stack_elt];
+
+ switch (op)
+ {
+ case DW_OP_deref:
+ {
+ char *ptr = (char *) result;
+ result = read_pointer (objfile->obfd, &ptr);
+ }
+ break;
+
+ case DW_OP_deref_size:
+ {
+ char *ptr = (char *) result;
+ switch (*op_ptr++)
+ {
+ case 1:
+ result = read_1u (objfile->obfd, &ptr);
+ break;
+ case 2:
+ result = read_2u (objfile->obfd, &ptr);
+ break;
+ case 4:
+ result = read_4u (objfile->obfd, &ptr);
+ break;
+ case 8:
+ result = read_8u (objfile->obfd, &ptr);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "execute_stack_op error");
+ }
+ }
+ break;
+
+ case DW_OP_abs:
+ if (result < 0)
+ result = -result;
+ break;
+ case DW_OP_neg:
+ result = -result;
+ break;
+ case DW_OP_not:
+ result = ~result;
+ break;
+ case DW_OP_plus_uconst:
+ result += read_uleb128 (objfile->obfd, &op_ptr);
+ break;
+ }
+ 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. */
+ CORE_ADDR first, second;
+ if ((stack_elt -= 2) < 0)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ second = stack[stack_elt];
+ first = stack[stack_elt + 1];
+
+ switch (op)
+ {
+ case DW_OP_and:
+ result = second & first;
+ break;
+ case DW_OP_div:
+ result = (LONGEST) second / (LONGEST) first;
+ break;
+ case DW_OP_minus:
+ result = second - first;
+ break;
+ case DW_OP_mod:
+ result = (LONGEST) second % (LONGEST) 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 = (LONGEST) second >> first;
+ break;
+ case DW_OP_xor:
+ result = second ^ first;
+ break;
+ case DW_OP_le:
+ result = (LONGEST) first <= (LONGEST) second;
+ break;
+ case DW_OP_ge:
+ result = (LONGEST) first >= (LONGEST) second;
+ break;
+ case DW_OP_eq:
+ result = (LONGEST) first == (LONGEST) second;
+ break;
+ case DW_OP_lt:
+ result = (LONGEST) first < (LONGEST) second;
+ break;
+ case DW_OP_gt:
+ result = (LONGEST) first > (LONGEST) second;
+ break;
+ case DW_OP_ne:
+ result = (LONGEST) first != (LONGEST) second;
+ break;
+ }
+ }
+ break;
+
+ case DW_OP_skip:
+ offset = read_2s (objfile->obfd, &op_ptr);
+ op_ptr += offset;
+ goto no_push;
+
+ case DW_OP_bra:
+ if (--stack_elt < 0)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ offset = read_2s (objfile->obfd, &op_ptr);
+ if (stack[stack_elt] != 0)
+ op_ptr += offset;
+ goto no_push;
+
+ case DW_OP_nop:
+ goto no_push;
+
+ default:
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ }
+
+ /* Most things push a result value. */
+ if ((size_t) stack_elt >= sizeof (stack) / sizeof (*stack))
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ 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)
+ internal_error (__FILE__, __LINE__, "execute_stack_op error");
+ return stack[stack_elt];
+}
+
+static void
+update_context (struct context *context, struct frame_state *fs, int chain)
+{
+ struct context *orig_context;
+ CORE_ADDR cfa;
+ long i;
+
+ orig_context = context_alloc ();
+ context_cpy (orig_context, context);
+ /* Compute this frame's CFA. */
+ switch (fs->cfa_how)
+ {
+ case CFA_REG_OFFSET:
+ get_reg ((char *) &cfa, context, fs->cfa_reg);
+ cfa += fs->cfa_offset;
+ break;
+
+ case CFA_EXP:
+ /* ??? No way of knowing what register number is the stack pointer
+ to do the same sort of handling as above. Assume that if the
+ CFA calculation is so complicated as to require a stack program
+ that this will not be a problem. */
+ {
+ char *exp = fs->cfa_exp;
+ ULONGEST len;
+
+ len = read_uleb128 (fs->objfile->obfd, &exp);
+ cfa = (CORE_ADDR) execute_stack_op (fs->objfile, exp,
+ exp + len, context, 0);
+ break;
+ }
+ }
+ context->cfa = cfa;
+
+ if (!chain)
+ orig_context->cfa = cfa;
+
+ /* Compute the addresses of all registers saved in this frame. */
+ for (i = 0; i < NUM_REGS; ++i)
+ switch (fs->regs.reg[i].how)
+ {
+ case REG_UNSAVED:
+ if (i == SP_REGNUM)
+ {
+ context->reg[i].how = REG_CTX_VALUE;
+ context->reg[i].loc.addr = cfa;
+ }
+ else
+ context->reg[i].how = REG_CTX_UNSAVED;
+ break;
+ case REG_SAVED_OFFSET:
+ context->reg[i].how = REG_CTX_SAVED_OFFSET;
+ context->reg[i].loc.offset = fs->regs.reg[i].loc.offset;
+ break;
+ case REG_SAVED_REG:
+ switch (orig_context->reg[fs->regs.reg[i].loc.reg].how)
+ {
+ case REG_CTX_UNSAVED:
+ context->reg[i].how = REG_CTX_UNSAVED;
+ break;
+ case REG_CTX_SAVED_OFFSET:
+ context->reg[i].how = REG_CTX_SAVED_OFFSET;
+ context->reg[i].loc.offset = orig_context->cfa - context->cfa +
+ orig_context->reg[fs->regs.reg[i].loc.reg].loc.offset;
+ break;
+ case REG_CTX_SAVED_REG:
+ context->reg[i].how = REG_CTX_SAVED_REG;
+ context->reg[i].loc.reg =
+ orig_context->reg[fs->regs.reg[i].loc.reg].loc.reg;
+ break;
+ case REG_CTX_SAVED_ADDR:
+ context->reg[i].how = REG_CTX_SAVED_ADDR;
+ context->reg[i].loc.addr =
+ orig_context->reg[fs->regs.reg[i].loc.reg].loc.addr;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "cfi_update_context: unknown register rule");
+ }
+ break;
+ case REG_SAVED_EXP:
+ {
+ char *exp = fs->regs.reg[i].loc.exp;
+ ULONGEST len;
+ CORE_ADDR val;
+
+ len = read_uleb128 (fs->objfile->obfd, &exp);
+ val = execute_stack_op (fs->objfile, exp, exp + len,
+ orig_context, cfa);
+ context->reg[i].how = REG_CTX_SAVED_ADDR;
+ context->reg[i].loc.addr = val;
+ }
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "cfi_update_context: unknown register rule");
+
+ }
+ get_reg ((char *) &context->ra, context, fs->retaddr_column);
+ unwind_tmp_obstack_free ();
+}
+
+static int
+is_cie (ULONGEST cie_id, int dwarf64)
+{
+ return dwarf64 ? (cie_id == 0xffffffffffffffff) : (cie_id == 0xffffffff);
+}
+
+static int
+compare_fde_unit (const void *a, const void *b)
+{
+ struct fde_unit **first, **second;
+ first = (struct fde_unit **) a;
+ second = (struct fde_unit **) b;
+ if ((*first)->initial_location > (*second)->initial_location)
+ return 1;
+ else if ((*first)->initial_location < (*second)->initial_location)
+ return -1;
+ else
+ return 0;
+}
+
+/* Build the cie_chunks and fde_chunks tables from informations
+ in .debug.frame section. */
+void
+dwarf2_build_frame_info (struct objfile *objfile)
+{
+ bfd *abfd = objfile->obfd;
+ char *start = NULL;
+ char *end = NULL;
+
+ obstack_init (&unwind_tmp_obstack);
+
+ dwarf_frame_buffer = 0;
+
+ if (dwarf_frame_offset)
+ {
+ dwarf_frame_buffer = dwarf2_read_section (objfile,
+ dwarf_frame_offset,
+ dwarf_frame_size);
+
+ start = dwarf_frame_buffer;
+ end = dwarf_frame_buffer + dwarf_frame_size;
+ }
+ else if (dwarf_eh_frame_offset)
+ {
+ dwarf_frame_buffer = dwarf2_read_section (objfile,
+ dwarf_eh_frame_offset,
+ dwarf_eh_frame_size);
+
+ start = dwarf_frame_buffer;
+ end = dwarf_frame_buffer + dwarf_eh_frame_size;
+ }
+
+ if (start)
+ {
+ while (start < end)
+ {
+ unsigned long length;
+ ULONGEST cie_id;
+ ULONGEST unit_offset = start - dwarf_frame_buffer;
+ int bytes_read;
+ int dwarf64;
+ char *block_end;
+
+ length = read_initial_length (abfd, start, &bytes_read);
+ start += bytes_read;
+ dwarf64 = (bytes_read == 12);
+ block_end = start + length;
+
+ cie_id = read_length (abfd, start, &bytes_read, dwarf64);
+ start += bytes_read;
+
+ if (is_cie (cie_id, dwarf64))
+ {
+ struct cie_unit *cie = cie_unit_alloc ();
+ char *aug;
+
+ cie->objfile = objfile;
+ cie->next = cie_chunks;
+ cie_chunks = cie;
+
+ cie->objfile = objfile;
+
+ cie->offset = unit_offset;
+
+ start++; /* version */
+
+ cie->augmentation = aug = start;
+ while (*start)
+ start++;
+ start++; /* skip past NUL */
+
+ cie->code_align = read_uleb128 (abfd, &start);
+ cie->data_align = read_sleb128 (abfd, &start);
+ cie->ra = read_1u (abfd, &start);
+
+ if (*aug == 'z')
+ {
+ int xtra = read_uleb128 (abfd, &start);
+ start += xtra;
+ ++aug;
+ }
+
+ while (*aug != '\0')
+ {
+ if (aug[0] == 'e' && aug[1] == 'h')
+ {
+ start += sizeof (void *);
+ aug += 2;
+ }
+ else if (aug[0] == 'R')
+ {
+ cie->addr_encoding = *start++;
+ aug += 1;
+ }
+ else if (aug[0] == 'P')
+ {
+ CORE_ADDR ptr;
+ ptr = read_encoded_pointer (abfd, &start,
+ cie->addr_encoding);
+ aug += 1;
+ }
+ else
+ warning ("unknown augmentation");
+ }
+
+ cie->data = start;
+ cie->data_length = block_end - start;
+ }
+ else
+ {
+ struct fde_unit *fde;
+ struct cie_unit *cie;
+
+ fde_chunks_need_space ();
+ fde = fde_unit_alloc ();
+
+ fde_chunks.array[fde_chunks.elems++] = fde;
+ fde->initial_location = read_pointer (abfd, &start);
+ fde->address_range = read_pointer (abfd, &start);
+
+ for (cie = cie_chunks;
+ cie && (cie->offset != cie_id); cie = cie->next);
+ if (!cie)
+ error ("dwarf cfi error: can't find CIE pointer");
+ fde->cie_ptr = cie;
+
+ if (cie->augmentation[0] == 'z')
+ read_uleb128 (abfd, &start);
+
+ fde->data = start;
+ fde->data_length = block_end - start;
+ }
+ start = block_end;
+ }
+ qsort (fde_chunks.array, fde_chunks.elems,
+ sizeof (struct fde_unit *), compare_fde_unit);
+ }
+}
+\f
+
+/* Return the frame address. */
+CORE_ADDR
+cfi_read_fp ()
+{
+ struct context *context;
+ struct frame_state *fs;
+ CORE_ADDR cfa;
+
+ context = context_alloc ();
+ fs = frame_state_alloc ();
+
+ context->ra = read_pc () + 1;
+
+ frame_state_for (context, fs);
+ update_context (context, fs, 0);
+
+ cfa = context->cfa;
+ unwind_tmp_obstack_free ();
+ return cfa;
+}
+
+/* Store the frame address. */
+void
+cfi_write_fp (CORE_ADDR val)
+{
+ struct context *context;
+ struct frame_state *fs;
+
+ context = context_alloc ();
+ fs = frame_state_alloc ();
+
+ context->ra = read_pc () + 1;
+
+ frame_state_for (context, fs);
+
+ if (fs->cfa_how == CFA_REG_OFFSET)
+ {
+ val -= fs->cfa_offset;
+ write_register_gen (fs->cfa_reg, (char *) &val);
+ }
+ else
+ warning ("Can't write fp.");
+
+ unwind_tmp_obstack_free ();
+}
+
+/* Restore the machine to the state it had before the current frame
+ was created. */
+void
+cfi_pop_frame (struct frame_info *fi)
+{
+ char regbuf[MAX_REGISTER_RAW_SIZE];
+ int regnum;
+
+ fi = get_current_frame ();
+
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ {
+ get_reg (regbuf, UNWIND_CONTEXT (fi), regnum);
+ write_register_bytes (REGISTER_BYTE (regnum), regbuf,
+ REGISTER_RAW_SIZE (regnum));
+ }
+ write_register (PC_REGNUM, UNWIND_CONTEXT (fi)->ra);
+
+ flush_cached_frames ();
+}
+
+/* Determine the address of the calling function's frame. */
+CORE_ADDR
+cfi_frame_chain (struct frame_info *fi)
+{
+ struct context *context;
+ struct frame_state *fs;
+ CORE_ADDR cfa;
+
+ context = context_alloc ();
+ fs = frame_state_alloc ();
+ context_cpy (context, UNWIND_CONTEXT (fi));
+
+ /* outermost frame */
+ if (context->ra == 0)
+ {
+ unwind_tmp_obstack_free ();
+ return 0;
+ }
+
+ frame_state_for (context, fs);
+ update_context (context, fs, 1);
+
+ cfa = context->cfa;
+ unwind_tmp_obstack_free ();
+ return cfa;
+}
+
+/* Sets the pc of the frame. */
+void
+cfi_init_frame_pc (int fromleaf, struct frame_info *fi)
+{
+ if (fi->next)
+ get_reg ((char *) &(fi->pc), UNWIND_CONTEXT (fi->next), PC_REGNUM);
+ else
+ fi->pc = read_pc ();
+}
+
+/* Initialize unwind context informations of the frame. */
+void
+cfi_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+{
+ struct frame_state *fs;
+
+ fs = frame_state_alloc ();
+ fi->context = frame_obstack_alloc (sizeof (struct context));
+ UNWIND_CONTEXT (fi)->reg =
+ frame_obstack_alloc (sizeof (struct context_reg) * NUM_REGS);
+ memset (UNWIND_CONTEXT (fi)->reg, 0,
+ sizeof (struct context_reg) * NUM_REGS);
+
+ if (fi->next)
+ {
+ context_cpy (UNWIND_CONTEXT (fi), UNWIND_CONTEXT (fi->next));
+ frame_state_for (UNWIND_CONTEXT (fi), fs);
+ update_context (UNWIND_CONTEXT (fi), fs, 1);
+ }
+ else
+ {
+ UNWIND_CONTEXT (fi)->ra = fi->pc + 1;
+ frame_state_for (UNWIND_CONTEXT (fi), fs);
+ update_context (UNWIND_CONTEXT (fi), fs, 0);
+ }
+ unwind_tmp_obstack_free ();
+}
+
+/* Obtain return address of the frame. */
+CORE_ADDR
+cfi_get_ra (struct frame_info *fi)
+{
+ return UNWIND_CONTEXT (fi)->ra;
+}
+
+/* Find register number REGNUM relative to FRAME and put its
+ (raw) contents in *RAW_BUFFER. Set *OPTIMIZED if the variable
+ was optimized out (and thus can't be fetched). If the variable
+ was fetched from memory, set *ADDRP to where it was fetched from,
+ otherwise it was fetched from a register.
+
+ The argument RAW_BUFFER must point to aligned memory. */
+void
+cfi_get_saved_register (char *raw_buffer,
+ int *optimized,
+ CORE_ADDR * addrp,
+ struct frame_info *frame,
+ int regnum, enum lval_type *lval)
+{
+ if (!target_has_registers)
+ error ("No registers.");
+
+ /* Normal systems don't optimize out things with register numbers. */
+ if (optimized != NULL)
+ *optimized = 0;
+
+ if (addrp) /* default assumption: not found in memory */
+ *addrp = 0;
+
+ if (!frame->next)
+ {
+ read_register_gen (regnum, raw_buffer);
+ if (lval != NULL)
+ *lval = lval_register;
+ if (addrp != NULL)
+ *addrp = REGISTER_BYTE (regnum);
+ }
+ else
+ {
+ frame = frame->next;
+ switch (UNWIND_CONTEXT (frame)->reg[regnum].how)
+ {
+ case REG_CTX_UNSAVED:
+ read_register_gen (regnum, raw_buffer);
+ if (lval != NULL)
+ *lval = not_lval;
+ if (optimized != NULL)
+ *optimized = 1;
+ break;
+ case REG_CTX_SAVED_OFFSET:
+ target_read_memory (UNWIND_CONTEXT (frame)->cfa +
+ UNWIND_CONTEXT (frame)->reg[regnum].loc.offset,
+ raw_buffer, REGISTER_RAW_SIZE (regnum));
+ if (lval != NULL)
+ *lval = lval_memory;
+ if (addrp != NULL)
+ *addrp =
+ UNWIND_CONTEXT (frame)->cfa +
+ UNWIND_CONTEXT (frame)->reg[regnum].loc.offset;
+ break;
+ case REG_CTX_SAVED_REG:
+ read_register_gen (UNWIND_CONTEXT (frame)->reg[regnum].loc.reg,
+ raw_buffer);
+ if (lval != NULL)
+ *lval = lval_register;
+ if (addrp != NULL)
+ *addrp =
+ REGISTER_BYTE (UNWIND_CONTEXT (frame)->reg[regnum].loc.reg);
+ break;
+ case REG_CTX_SAVED_ADDR:
+ target_read_memory (UNWIND_CONTEXT (frame)->reg[regnum].loc.addr,
+ raw_buffer, REGISTER_RAW_SIZE (regnum));
+ if (lval != NULL)
+ *lval = lval_memory;
+ if (addrp != NULL)
+ *addrp = UNWIND_CONTEXT (frame)->reg[regnum].loc.addr;
+ break;
+ case REG_CTX_VALUE:
+ memcpy (raw_buffer, &UNWIND_CONTEXT (frame)->reg[regnum].loc.addr,
+ REGISTER_RAW_SIZE (regnum));
+ if (lval != NULL)
+ *lval = not_lval;
+ if (optimized != NULL)
+ *optimized = 0;
+ break;
+ default:
+ internal_error (__FILE__, __LINE__,
+ "cfi_get_saved_register: unknown register rule");
+ }
+ }
+}
+
+/* Return the register that the function uses for a frame pointer,
+ plus any necessary offset to be applied to the register before
+ any frame pointer offsets. */
+void
+cfi_virtual_frame_pointer (CORE_ADDR pc, int *frame_reg,
+ LONGEST * frame_offset)
+{
+ struct context *context;
+ struct frame_state *fs;
+
+ context = context_alloc ();
+ fs = frame_state_alloc ();
+
+ context->ra = read_pc () + 1;
+
+ frame_state_for (context, fs);
+
+ if (fs->cfa_how == CFA_REG_OFFSET)
+ {
+ *frame_reg = fs->cfa_reg;
+ *frame_offset = fs->cfa_offset;
+ }
+ else
+ error ("dwarf cfi error: CFA is not defined as CFA_REG_OFFSET");
+
+ unwind_tmp_obstack_free ();
+}
projects / binutils-gdb.git / commitdiff