#include "gdb_assert.h"
#include "gdb_string.h"
+#include "complaints.h"
#include "dwarf2-frame.h"
/* Call Frame Information (CFI). */
/* Encoding of addresses. */
unsigned char encoding;
+ /* True if a 'z' augmentation existed. */
+ unsigned char saw_z_augmentation;
+
struct dwarf2_cie *next;
};
/* Structure describing a frame state. */
+enum dwarf2_reg_rule
+{
+ /* Make certain that 0 maps onto the correct enum value - the
+ corresponding structure is being initialized using memset zero.
+ This indicates that CFI didn't provide any information at all
+ about a register - leaving how to obtain it's value totally
+ unspecified. */
+ REG_UNSPECIFIED = 0,
+ /* The term "undefined" comes from the DWARF2 CFI spec which this
+ code is moddeling - it indicates that the register's value is
+ "undefined". */
+ /* NOTE: cagney/2003-09-08: GCC uses the less formal term "unsaved"
+ - it's definition is a combination of REG_UNDEFINED and
+ REG_UNSPECIFIED - the failure to differentiate the two helps
+ explain a few problems with the CFI GCC outputs. */
+ REG_UNDEFINED,
+ REG_SAVED_OFFSET,
+ REG_SAVED_REG,
+ REG_SAVED_EXP,
+ REG_SAME_VALUE
+};
+
struct dwarf2_frame_state
{
/* Each register save state can be described in terms of a CFA slot,
unsigned char *exp;
} loc;
ULONGEST exp_len;
- enum {
- REG_UNSAVED,
- REG_SAVED_OFFSET,
- REG_SAVED_REG,
- REG_SAVED_EXP,
- REG_UNMODIFIED
- } how;
+ enum dwarf2_reg_rule how;
} *reg;
int num_regs;
xrealloc (rs->reg, num_regs * size);
/* Initialize newly allocated registers. */
- memset (rs->reg + rs->num_regs * size, 0, (num_regs - rs->num_regs) * size);
+ memset (rs->reg + rs->num_regs, 0, (num_regs - rs->num_regs) * size);
rs->num_regs = num_regs;
}
case DW_CFA_undefined:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg].how = REG_UNSAVED;
+ fs->regs.reg[reg].how = REG_UNDEFINED;
break;
case DW_CFA_same_value:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
- fs->regs.reg[reg].how = REG_UNMODIFIED;
+ fs->regs.reg[reg].how = REG_SAME_VALUE;
break;
case DW_CFA_register:
insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ fs->regs.reg[reg].how = REG_SAVED_REG;
fs->regs.reg[reg].loc.reg = utmp;
break;
struct dwarf2_frame_state_reg *reg;
};
-struct dwarf2_frame_cache *
+static struct dwarf2_frame_cache *
dwarf2_frame_cache (struct frame_info *next_frame, void **this_cache)
{
struct cleanup *old_chain;
- int num_regs = NUM_REGS + NUM_PSEUDO_REGS;
+ const int num_regs = NUM_REGS + NUM_PSEUDO_REGS;
struct dwarf2_frame_cache *cache;
struct dwarf2_frame_state *fs;
struct dwarf2_fde *fde;
- int reg;
if (*this_cache)
return *this_cache;
done for "normal" frames and not for resume-type frames (signal
handlers, sentinel frames, dummy frames).
- We don't do what GCC's does here (yet). It's not clear how
- reliable the method is. There's also a problem with finding the
- right FDE; see the comment in dwarf_frame_p. If dwarf_frame_p
- selected this frame unwinder because it found the FDE for the
- next function, using the adjusted return address might not yield
- a FDE at all. The problem isn't specific to DWARF CFI; other
- unwinders loose in similar ways. Therefore it's probably
- acceptable to leave things slightly broken for now. */
- fs->pc = frame_pc_unwind (next_frame);
+ frame_unwind_address_in_block does just this.
+
+ It's not clear how reliable the method is though - there is the
+ potential for the register state pre-call being different to that
+ on return. */
+ fs->pc = frame_unwind_address_in_block (next_frame);
/* Find the correct FDE. */
fde = dwarf2_frame_find_fde (&fs->pc);
internal_error (__FILE__, __LINE__, "Unknown CFA rule.");
}
- /* Save the register info in the cache. */
- for (reg = 0; reg < fs->regs.num_regs; reg++)
- {
- int regnum;
-
- /* Skip the return address column. */
- if (reg == fs->retaddr_column)
- continue;
-
- /* Use the GDB register number as index. */
- regnum = DWARF2_REG_TO_REGNUM (reg);
+ /* Initialize things so that all registers are marked as
+ unspecified. */
+ {
+ int regnum;
+ for (regnum = 0; regnum < num_regs; regnum++)
+ cache->reg[regnum].how = REG_UNSPECIFIED;
+ }
- if (regnum >= 0 && regnum < num_regs)
- cache->reg[regnum] = fs->regs.reg[reg];
+ /* Go through the DWARF2 CFI generated table and save its register
+ location information in the cache. */
+ {
+ int column; /* CFI speak for "register number". */
+ for (column = 0; column < fs->regs.num_regs; column++)
+ {
+ int regnum;
+
+ /* Skip the return address column. */
+ if (column == fs->retaddr_column)
+ /* NOTE: cagney/2003-06-07: Is this right? What if
+ RETADDR_COLUMN corresponds to a real register (and,
+ worse, that isn't the PC_REGNUM)? I'm guessing that the
+ PC_REGNUM further down is trying to handle this. That
+ can't be right though - PC_REGNUM may not be valid (it
+ can be -ve). I think, instead when RETADDR_COLUM isn't a
+ real register, it should map itself onto frame_pc_unwind. */
+ continue;
+
+ /* Use the GDB register number as the destination index. */
+ regnum = DWARF2_REG_TO_REGNUM (column);
+
+ /* If there's no corresponding GDB register, ignore it. */
+ if (regnum < 0 || regnum >= num_regs)
+ continue;
+
+ /* NOTE: cagney/2003-09-05: CFI should specify the disposition
+ of all debug info registers. If it doesn't complain (but
+ not too loudly). It turns out that GCC, assumes that an
+ unspecified register implies "same value" when CFI (draft
+ 7) specifies nothing at all. Such a register could equally
+ be interpreted as "undefined". Also note that this check
+ isn't sufficient - it only checks that all registers in the
+ range [0 .. max column] are specified - and won't detect
+ problems when a debug info register falls outside of the
+ table. Need a way of iterating through all the valid
+ DWARF2 register numbers. */
+ if (fs->regs.reg[column].how == REG_UNSPECIFIED)
+ complaint (&symfile_complaints,
+ "Incomplete CFI data; unspecified registers at 0x%s",
+ paddr (fs->pc));
+
+ cache->reg[regnum] = fs->regs.reg[column];
+ }
+ }
+
+ /* Store the location of the return addess. If the return address
+ column (adjusted) is not the same as gdb's PC_REGNUM, then this
+ implies a copy from the ra column register. */
+ if (fs->retaddr_column < fs->regs.num_regs
+ && fs->regs.reg[fs->retaddr_column].how != REG_UNDEFINED)
+ {
+ /* See comment above about a possibly -ve PC_REGNUM. If this
+ assertion fails, it's a problem with this code and not the
+ architecture. */
+ gdb_assert (PC_REGNUM >= 0);
+ cache->reg[PC_REGNUM] = fs->regs.reg[fs->retaddr_column];
+ }
+ else
+ {
+ int reg = DWARF2_REG_TO_REGNUM (fs->retaddr_column);
+ if (reg != PC_REGNUM)
+ {
+ /* See comment above about PC_REGNUM being -ve. If this
+ assertion fails, it's a problem with this code and not
+ the architecture. */
+ gdb_assert (PC_REGNUM >= 0);
+ cache->reg[PC_REGNUM].loc.reg = reg;
+ cache->reg[PC_REGNUM].how = REG_SAVED_REG;
+ }
}
-
- /* Stored the location of the return addess. */
- if (fs->retaddr_column < fs->regs.num_regs)
- cache->reg[PC_REGNUM] = fs->regs.reg[fs->retaddr_column];
do_cleanups (old_chain);
switch (cache->reg[regnum].how)
{
- case REG_UNSAVED:
+ case REG_UNDEFINED:
+ /* If CFI explicitly specified that the value isn't defined,
+ mark it as optimized away - the value isn't available. */
*optimizedp = 1;
*lvalp = not_lval;
*addrp = 0;
/* GCC defines the CFA as the value of the stack pointer
just before the call instruction is executed. Do other
compilers use the same definition? */
+ /* DWARF V3 Draft 7 p102: Typically, the CFA is defined to
+ be the value of the stack pointer at the call site in the
+ previous frame (which may be different from its value on
+ entry to the current frame). */
+ /* DWARF V3 Draft 7 p103: The first column of the rules
+ defines the rule which computes the CFA value; it may be
+ either a register and a signed offset that are added
+ together or a DWARF expression that is evaluated. */
+ /* FIXME: cagney/2003-07-07: I don't understand this. The
+ CFI info should have provided unwind information for the
+ SP register and then pointed ->cfa_reg at it, not the
+ reverse. Assuming that SP_REGNUM is !-ve, there is a
+ very real posibility that CFA is an offset from some
+ other register, having nothing to do with the unwound SP
+ value. */
+ /* FIXME: cagney/2003-09-05: I think I understand. GDB was
+ lumping the two states "unspecified" and "undefined"
+ together. Here SP_REGNUM was "unspecified", GCC assuming
+ that in such a case CFA would be used. This branch of
+ the if statement should be deleted - the problem of
+ SP_REGNUM is now handed by the case REG_UNSPECIFIED
+ below. */
*optimizedp = 0;
if (valuep)
{
}
break;
- case REG_UNMODIFIED:
+ case REG_UNSPECIFIED:
+ /* GCC, in its infinite wisdom decided to not provide unwind
+ information for registers that are "same value". Since
+ DWARF2 (3 draft 7) doesn't define such behavior, said
+ registers are actually undefined (which is different to CFI
+ "undefined"). Code above issues a complaint about this.
+ Here just fudge the books, assume GCC, and that the value is
+ more inner on the stack. */
+ if (SP_REGNUM >= 0 && regnum == SP_REGNUM)
+ {
+ /* Can things get worse? Yep! One of the registers GCC
+ forgot to provide unwind information for was the stack
+ pointer. Outch! GCC appears to assumes that the CFA
+ address can be used - after all it points to the inner
+ most address of the previous frame before the function
+ call and that's always the same as the stack pointer on
+ return, right? Wrong. See GCC's i386 STDCALL option for
+ an ABI that has a different entry and return stack
+ pointer. */
+ /* DWARF V3 Draft 7 p102: Typically, the CFA is defined to
+ be the value of the stack pointer at the call site in the
+ previous frame (which may be different from its value on
+ entry to the current frame). */
+ /* DWARF V3 Draft 7 p103: The first column of the rules
+ defines the rule which computes the CFA value; it may be
+ either a register and a signed offset that are added
+ together or a DWARF expression that is evaluated. */
+ /* NOTE: cagney/2003-09-05: Should issue a complain.
+ Unfortunately it turns out that DWARF2 CFI has a problem.
+ Since CFI specifies the location at which a register was
+ saved (not its value) it isn't possible to specify
+ something like "unwound(REG) == REG + constant" using CFI
+ as will almost always occure with the stack pointer. I
+ guess CFI should be point SP at CFA. Ref: danielj,
+ "Describing unsaved stack pointers", posted to dwarf2
+ list 2003-08-15. */
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (valuep)
+ /* Store the value. */
+ store_typed_address (valuep, builtin_type_void_data_ptr,
+ cache->cfa);
+ }
+ else
+ /* Assume that the register can be found in the next inner
+ most frame. */
+ frame_register_unwind (next_frame, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+ break;
+
+ case REG_SAME_VALUE:
frame_register_unwind (next_frame, regnum,
optimizedp, lvalp, addrp, realnump, valuep);
break;
};
const struct frame_unwind *
-dwarf2_frame_p (CORE_ADDR pc)
+dwarf2_frame_sniffer (struct frame_info *next_frame)
{
- /* The way GDB works, this function can be called with PC just after
- the last instruction of the function we're supposed to return the
- unwind methods for. In that case we won't find the correct FDE;
- instead we find the FDE for the next function, or we won't find
- an FDE at all. There is a possible solution (see the comment in
- dwarf2_frame_cache), GDB doesn't pass us enough information to
- implement it. */
- if (dwarf2_frame_find_fde (&pc))
+ /* Grab an address that is guarenteed to reside somewhere within the
+ function. frame_pc_unwind(), for a no-return next function, can
+ end up returning something past the end of this function's body. */
+ CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame);
+ if (dwarf2_frame_find_fde (&block_addr))
return &dwarf2_frame_unwind;
return NULL;
};
const struct frame_base *
-dwarf2_frame_base_p (CORE_ADDR pc)
+dwarf2_frame_base_sniffer (struct frame_info *next_frame)
{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
if (dwarf2_frame_find_fde (&pc))
return &dwarf2_frame_base;
/* Pointer to the .debug_frame section. */
asection *dwarf_frame_section;
+
+ /* Base for DW_EH_PE_datarel encodings. */
+ bfd_vma dbase;
+
+ /* Base for DW_EH_PE_textrel encodings. */
+ bfd_vma tbase;
};
+const struct objfile_data *dwarf2_frame_data;
+
static unsigned int
read_1_byte (bfd *bfd, char *buf)
{
read_encoded_value (struct comp_unit *unit, unsigned char encoding,
char *buf, unsigned int *bytes_read_ptr)
{
+ int ptr_len = size_of_encoded_value (DW_EH_PE_absptr);
+ ptrdiff_t offset;
CORE_ADDR base;
/* GCC currently doesn't generate DW_EH_PE_indirect encodings for
internal_error (__FILE__, __LINE__,
"Unsupported encoding: DW_EH_PE_indirect");
+ *bytes_read_ptr = 0;
+
switch (encoding & 0x70)
{
case DW_EH_PE_absptr:
base = bfd_get_section_vma (unit->bfd, unit->dwarf_frame_section);
base += (buf - unit->dwarf_frame_buffer);
break;
+ case DW_EH_PE_datarel:
+ base = unit->dbase;
+ break;
+ case DW_EH_PE_textrel:
+ base = unit->tbase;
+ break;
+ case DW_EH_PE_aligned:
+ base = 0;
+ offset = buf - unit->dwarf_frame_buffer;
+ if ((offset % ptr_len) != 0)
+ {
+ *bytes_read_ptr = ptr_len - (offset % ptr_len);
+ buf += *bytes_read_ptr;
+ }
+ break;
default:
internal_error (__FILE__, __LINE__, "Invalid or unsupported encoding");
}
if ((encoding & 0x0f) == 0x00)
- encoding |= encoding_for_size (TYPE_LENGTH(builtin_type_void_data_ptr));
+ encoding |= encoding_for_size (ptr_len);
switch (encoding & 0x0f)
{
case DW_EH_PE_udata2:
- *bytes_read_ptr = 2;
+ *bytes_read_ptr += 2;
return (base + bfd_get_16 (unit->abfd, (bfd_byte *) buf));
case DW_EH_PE_udata4:
- *bytes_read_ptr = 4;
+ *bytes_read_ptr += 4;
return (base + bfd_get_32 (unit->abfd, (bfd_byte *) buf));
case DW_EH_PE_udata8:
- *bytes_read_ptr = 8;
+ *bytes_read_ptr += 8;
return (base + bfd_get_64 (unit->abfd, (bfd_byte *) buf));
case DW_EH_PE_sdata2:
- *bytes_read_ptr = 2;
+ *bytes_read_ptr += 2;
return (base + bfd_get_signed_16 (unit->abfd, (bfd_byte *) buf));
case DW_EH_PE_sdata4:
- *bytes_read_ptr = 4;
+ *bytes_read_ptr += 4;
return (base + bfd_get_signed_32 (unit->abfd, (bfd_byte *) buf));
case DW_EH_PE_sdata8:
- *bytes_read_ptr = 8;
+ *bytes_read_ptr += 8;
return (base + bfd_get_signed_64 (unit->abfd, (bfd_byte *) buf));
default:
internal_error (__FILE__, __LINE__, "Invalid or unsupported encoding");
struct dwarf2_fde *fde;
CORE_ADDR offset;
+ fde = objfile_data (objfile, dwarf2_frame_data);
+ if (fde == NULL)
+ continue;
+
+ gdb_assert (objfile->section_offsets);
offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
-
- fde = objfile->sym_private;
+
while (fde)
{
if (*pc >= fde->initial_location + offset
static void
add_fde (struct comp_unit *unit, struct dwarf2_fde *fde)
{
- fde->next = unit->objfile->sym_private;
- unit->objfile->sym_private = fde;
+ fde->next = objfile_data (unit->objfile, dwarf2_frame_data);
+ set_objfile_data (unit->objfile, dwarf2_frame_data, fde);
}
#ifdef CC_HAS_LONG_LONG
#define DW64_CIE_ID ~0
#endif
-/* Read a CIE or FDE in BUF and decode it. */
+static char *decode_frame_entry (struct comp_unit *unit, char *start,
+ int eh_frame_p);
+/* Decode the next CIE or FDE. Return NULL if invalid input, otherwise
+ the next byte to be processed. */
static char *
-decode_frame_entry (struct comp_unit *unit, char *buf, int eh_frame_p)
+decode_frame_entry_1 (struct comp_unit *unit, char *start, int eh_frame_p)
{
+ char *buf;
LONGEST length;
unsigned int bytes_read;
- int dwarf64_p = 0;
- ULONGEST cie_id = DW_CIE_ID;
+ int dwarf64_p;
+ ULONGEST cie_id;
ULONGEST cie_pointer;
- char *start = buf;
char *end;
+ buf = start;
length = read_initial_length (unit->abfd, buf, &bytes_read);
buf += bytes_read;
end = buf + length;
+ /* Are we still within the section? */
+ if (end > unit->dwarf_frame_buffer + unit->dwarf_frame_size)
+ return NULL;
+
if (length == 0)
return end;
- if (bytes_read == 12)
- dwarf64_p = 1;
+ /* Distinguish between 32 and 64-bit encoded frame info. */
+ dwarf64_p = (bytes_read == 12);
- /* In a .eh_frame section, zero is used to distinguish CIEs from
- FDEs. */
+ /* In a .eh_frame section, zero is used to distinguish CIEs from FDEs. */
if (eh_frame_p)
cie_id = 0;
else if (dwarf64_p)
cie_id = DW64_CIE_ID;
+ else
+ cie_id = DW_CIE_ID;
if (dwarf64_p)
{
cie->encoding = encoding_for_size (unit->addr_size);
/* Check version number. */
- gdb_assert (read_1_byte (unit->abfd, buf) == DW_CIE_VERSION);
+ if (read_1_byte (unit->abfd, buf) != DW_CIE_VERSION)
+ return NULL;
buf += 1;
/* Interpret the interesting bits of the augmentation. */
cie->return_address_register = read_1_byte (unit->abfd, buf);
buf += 1;
- if (*augmentation == 'z')
+ cie->saw_z_augmentation = (*augmentation == 'z');
+ if (cie->saw_z_augmentation)
{
ULONGEST length;
length = read_unsigned_leb128 (unit->abfd, buf, &bytes_read);
buf += bytes_read;
+ if (buf > end)
+ return NULL;
cie->initial_instructions = buf + length;
augmentation++;
}
/* This is a FDE. */
struct dwarf2_fde *fde;
+ /* In an .eh_frame section, the CIE pointer is the delta between the
+ address within the FDE where the CIE pointer is stored and the
+ address of the CIE. Convert it to an offset into the .eh_frame
+ section. */
if (eh_frame_p)
{
- /* In an .eh_frame section, the CIE pointer is the delta
- between the address within the FDE where the CIE pointer
- is stored and the address of the CIE. Convert it to an
- offset into the .eh_frame section. */
cie_pointer = buf - unit->dwarf_frame_buffer - cie_pointer;
cie_pointer -= (dwarf64_p ? 8 : 4);
}
+ /* In either case, validate the result is still within the section. */
+ if (cie_pointer >= unit->dwarf_frame_size)
+ return NULL;
+
fde = (struct dwarf2_fde *)
obstack_alloc (&unit->objfile->psymbol_obstack,
sizeof (struct dwarf2_fde));
read_encoded_value (unit, fde->cie->encoding & 0x0f, buf, &bytes_read);
buf += bytes_read;
+ /* A 'z' augmentation in the CIE implies the presence of an
+ augmentation field in the FDE as well. The only thing known
+ to be in here at present is the LSDA entry for EH. So we
+ can skip the whole thing. */
+ if (fde->cie->saw_z_augmentation)
+ {
+ ULONGEST length;
+
+ length = read_unsigned_leb128 (unit->abfd, buf, &bytes_read);
+ buf += bytes_read + length;
+ if (buf > end)
+ return NULL;
+ }
+
fde->instructions = buf;
fde->end = end;
return end;
}
+
+/* Read a CIE or FDE in BUF and decode it. */
+static char *
+decode_frame_entry (struct comp_unit *unit, char *start, int eh_frame_p)
+{
+ enum { NONE, ALIGN4, ALIGN8, FAIL } workaround = NONE;
+ char *ret;
+ const char *msg;
+ ptrdiff_t start_offset;
+
+ while (1)
+ {
+ ret = decode_frame_entry_1 (unit, start, eh_frame_p);
+ if (ret != NULL)
+ break;
+
+ /* We have corrupt input data of some form. */
+
+ /* ??? Try, weakly, to work around compiler/assembler/linker bugs
+ and mismatches wrt padding and alignment of debug sections. */
+ /* Note that there is no requirement in the standard for any
+ alignment at all in the frame unwind sections. Testing for
+ alignment before trying to interpret data would be incorrect.
+
+ However, GCC traditionally arranged for frame sections to be
+ sized such that the FDE length and CIE fields happen to be
+ aligned (in theory, for performance). This, unfortunately,
+ was done with .align directives, which had the side effect of
+ forcing the section to be aligned by the linker.
+
+ This becomes a problem when you have some other producer that
+ creates frame sections that are not as strictly aligned. That
+ produces a hole in the frame info that gets filled by the
+ linker with zeros.
+
+ The GCC behaviour is arguably a bug, but it's effectively now
+ part of the ABI, so we're now stuck with it, at least at the
+ object file level. A smart linker may decide, in the process
+ of compressing duplicate CIE information, that it can rewrite
+ the entire output section without this extra padding. */
+
+ start_offset = start - unit->dwarf_frame_buffer;
+ if (workaround < ALIGN4 && (start_offset & 3) != 0)
+ {
+ start += 4 - (start_offset & 3);
+ workaround = ALIGN4;
+ continue;
+ }
+ if (workaround < ALIGN8 && (start_offset & 7) != 0)
+ {
+ start += 8 - (start_offset & 7);
+ workaround = ALIGN8;
+ continue;
+ }
+
+ /* Nothing left to try. Arrange to return as if we've consumed
+ the entire input section. Hopefully we'll get valid info from
+ the other of .debug_frame/.eh_frame. */
+ workaround = FAIL;
+ ret = unit->dwarf_frame_buffer + unit->dwarf_frame_size;
+ break;
+ }
+
+ switch (workaround)
+ {
+ case NONE:
+ break;
+
+ case ALIGN4:
+ complaint (&symfile_complaints,
+ "Corrupt data in %s:%s; align 4 workaround apparently succeeded",
+ unit->dwarf_frame_section->owner->filename,
+ unit->dwarf_frame_section->name);
+ break;
+
+ case ALIGN8:
+ complaint (&symfile_complaints,
+ "Corrupt data in %s:%s; align 8 workaround apparently succeeded",
+ unit->dwarf_frame_section->owner->filename,
+ unit->dwarf_frame_section->name);
+ break;
+
+ default:
+ complaint (&symfile_complaints,
+ "Corrupt data in %s:%s",
+ unit->dwarf_frame_section->owner->filename,
+ unit->dwarf_frame_section->name);
+ break;
+ }
+
+ return ret;
+}
+
\f
/* FIXME: kettenis/20030504: This still needs to be integrated with
unit.abfd = objfile->obfd;
unit.objfile = objfile;
unit.addr_size = objfile->obfd->arch_info->bits_per_address / 8;
+ unit.dbase = 0;
+ unit.tbase = 0;
/* First add the information from the .eh_frame section. That way,
the FDEs from that section are searched last. */
if (dwarf_eh_frame_offset)
{
+ asection *got, *txt;
+
unit.cie = NULL;
unit.dwarf_frame_buffer = dwarf2_read_section (objfile,
dwarf_eh_frame_offset,
unit.dwarf_frame_size = dwarf_eh_frame_size;
unit.dwarf_frame_section = dwarf_eh_frame_section;
+ /* FIXME: kettenis/20030602: This is the DW_EH_PE_datarel base
+ that is used for the i386/amd64 target, which currently is
+ the only target in GCC that supports/uses the
+ DW_EH_PE_datarel encoding. */
+ got = bfd_get_section_by_name (unit.abfd, ".got");
+ if (got)
+ unit.dbase = got->vma;
+
+ /* GCC emits the DW_EH_PE_textrel encoding type on sh and ia64
+ so far. */
+ txt = bfd_get_section_by_name (unit.abfd, ".text");
+ if (txt)
+ unit.tbase = txt->vma;
+
frame_ptr = unit.dwarf_frame_buffer;
while (frame_ptr < unit.dwarf_frame_buffer + unit.dwarf_frame_size)
frame_ptr = decode_frame_entry (&unit, frame_ptr, 1);
frame_ptr = decode_frame_entry (&unit, frame_ptr, 0);
}
}
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_dwarf2_frame (void);
+
+void
+_initialize_dwarf2_frame (void)
+{
+ dwarf2_frame_data = register_objfile_data ();
+}
projects / thirdparty / binutils-gdb.git / blobdiff