static CORE_ADDR
alpha_mdebug_after_prologue (CORE_ADDR pc, struct mdebug_extra_func_info *proc_desc)
{
if (proc_desc)
{
/* If function is frameless, then we need to do it the hard way. I
strongly suspect that frameless always means prologueless... */
if (PROC_FRAME_REG (proc_desc) == ALPHA_SP_REGNUM
&& PROC_FRAME_OFFSET (proc_desc) == 0)
return 0;
}
return alpha_after_prologue (pc);
}
static struct mdebug_extra_func_info *
non_heuristic_proc_desc (CORE_ADDR pc, CORE_ADDR *addrptr)
{
CORE_ADDR startaddr;
struct mdebug_extra_func_info *proc_desc;
struct block *b = block_for_pc (pc);
struct symbol *sym;
struct obj_section *sec;
struct mips_objfile_private *priv;
find_pc_partial_function (pc, NULL, &startaddr, NULL);
if (addrptr)
*addrptr = startaddr;
priv = NULL;
sec = find_pc_section (pc);
if (sec != NULL)
{
priv = (struct mips_objfile_private *) objfile_data (sec->objfile, mips_pdr_data);
/* Search the ".pdr" section generated by GAS. This includes most of
the information normally found in ECOFF PDRs. */
the_bfd = sec->objfile->obfd;
if (priv == NULL
&& (the_bfd->format == bfd_object
&& bfd_get_flavour (the_bfd) == bfd_target_elf_flavour
&& elf_elfheader (the_bfd)->e_ident[EI_CLASS] == ELFCLASS64))
{
/* Right now GAS only outputs the address as a four-byte sequence.
This means that we should not bother with this method on 64-bit
targets (until that is fixed). */
priv = obstack_alloc (&sec->objfile->objfile_obstack,
sizeof (struct mips_objfile_private));
priv->size = 0;
set_objfile_data (sec->objfile, mips_pdr_data, priv);
}
else if (priv == NULL)
{
asection *bfdsec;
priv = obstack_alloc (&sec->objfile->objfile_obstack,
sizeof (struct mips_objfile_private));
bfdsec = bfd_get_section_by_name (sec->objfile->obfd, ".pdr");
if (bfdsec != NULL)
{
priv->size = bfd_section_size (sec->objfile->obfd, bfdsec);
priv->contents = obstack_alloc (&sec->objfile->objfile_obstack,
priv->size);
bfd_get_section_contents (sec->objfile->obfd, bfdsec,
priv->contents, 0, priv->size);
/* In general, the .pdr section is sorted. However, in the
presence of multiple code sections (and other corner cases)
it can become unsorted. Sort it so that we can use a faster
binary search. */
qsort (priv->contents, priv->size / 32, 32,
compare_pdr_entries);
}
else
priv->size = 0;
set_objfile_data (sec->objfile, mips_pdr_data, priv);
}
the_bfd = NULL;
if (priv->size != 0)
{
int low, mid, high;
char *ptr;
CORE_ADDR pdr_pc;
low = 0;
high = priv->size / 32;
/* We've found a .pdr section describing this objfile. We want to
find the entry which describes this code address. The .pdr
information is not very descriptive; we have only a function
start address. We have to look for the closest entry, because
the local symbol at the beginning of this function may have
been stripped - so if we ask the symbol table for the start
address we may get a preceding global function. */
/* First, find the last .pdr entry starting at or before PC. */
do
{
mid = (low + high) / 2;
ptr = priv->contents + mid * 32;
pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr);
pdr_pc += ANOFFSET (sec->objfile->section_offsets,
SECT_OFF_TEXT (sec->objfile));
if (pdr_pc > pc)
high = mid;
else
low = mid + 1;
}
while (low != high);
/* Both low and high point one past the PDR of interest. If
both are zero, that means this PC is before any region
covered by a PDR, i.e. pdr_pc for the first PDR entry is
greater than PC. */
if (low > 0)
{
ptr = priv->contents + (low - 1) * 32;
pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr);
pdr_pc += ANOFFSET (sec->objfile->section_offsets,
SECT_OFF_TEXT (sec->objfile));
}
/* We don't have a range, so we have no way to know for sure
whether we're in the correct PDR or a PDR for a preceding
function and the current function was a stripped local
symbol. But if the PDR's PC is at least as great as the
best guess from the symbol table, assume that it does cover
the right area; if a .pdr section is present at all then
nearly every function will have an entry. The biggest exception
will be the dynamic linker stubs; conveniently these are
placed before .text instead of after. */
if (pc >= pdr_pc && pdr_pc >= startaddr)
{
struct symbol *sym = find_pc_function (pc);
if (addrptr)
*addrptr = pdr_pc;
/* Fill in what we need of the proc_desc. */
proc_desc = (struct mdebug_extra_func_info *)
obstack_alloc (&sec->objfile->objfile_obstack,
sizeof (struct mdebug_extra_func_info));
PROC_LOW_ADDR (proc_desc) = pdr_pc;
PROC_FRAME_OFFSET (proc_desc)
= bfd_get_signed_32 (sec->objfile->obfd, ptr + 20);
PROC_FRAME_REG (proc_desc) = bfd_get_32 (sec->objfile->obfd,
ptr + 24);
PROC_REG_MASK (proc_desc) = bfd_get_32 (sec->objfile->obfd,
ptr + 4);
PROC_FREG_MASK (proc_desc) = bfd_get_32 (sec->objfile->obfd,
ptr + 12);
PROC_REG_OFFSET (proc_desc)
= bfd_get_signed_32 (sec->objfile->obfd, ptr + 8);
PROC_FREG_OFFSET (proc_desc)
= bfd_get_signed_32 (sec->objfile->obfd, ptr + 16);
PROC_PC_REG (proc_desc) = bfd_get_32 (sec->objfile->obfd,
ptr + 28);
proc_desc->pdr.isym = (long) sym;
return proc_desc;
}
}
}
if (b == NULL)
return NULL;
if (startaddr > BLOCK_START (b))
{
/* This is the "pathological" case referred to in a comment in
print_frame_info. It might be better to move this check into
symbol reading. */
return NULL;
}
sym = lookup_symbol (MDEBUG_EFI_SYMBOL_NAME, b, LABEL_DOMAIN, 0);
/* If we never found a PDR for this function in symbol reading, then
examine prologues to find the information. */
if (sym)
{
proc_desc = (struct mdebug_extra_func_info *) SYMBOL_VALUE (sym);
if (PROC_FRAME_REG (proc_desc) == -1)
return NULL;
else
return proc_desc;
}
else
return NULL;
}
static int
alpha_mdebug_frameless (struct mdebug_extra_func_info *proc_desc)
{
return (PROC_FRAME_REG (proc_desc) == ALPHA_SP_REGNUM
&& PROC_FRAME_OFFSET (proc_desc) == 0);
}