#include "frame-base.h"
#include "trad-frame.h"
+static const struct objfile_data *mips_pdr_data;
+
static void set_reg_offset (CORE_ADDR *saved_regs, int regnum, CORE_ADDR off);
static struct type *mips_register_type (struct gdbarch *gdbarch, int regnum);
sec = find_pc_section (pc);
if (sec != NULL)
{
- priv = (struct mips_objfile_private *) sec->objfile->obj_private;
+ 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. */
priv = obstack_alloc (&sec->objfile->objfile_obstack,
sizeof (struct mips_objfile_private));
priv->size = 0;
- sec->objfile->obj_private = priv;
+ set_objfile_data (sec->objfile, mips_pdr_data, priv);
}
else if (priv == NULL)
{
else
priv->size = 0;
- sec->objfile->obj_private = priv;
+ set_objfile_data (sec->objfile, mips_pdr_data, priv);
}
the_bfd = NULL;
{
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
{
- CORE_ADDR pdr_pc;
-
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 == startaddr)
- break;
- if (pdr_pc > startaddr)
+
+ if (pdr_pc > pc)
high = mid;
else
low = mid + 1;
}
while (low != high);
- if (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 = (mips_extra_func_info_t)
obstack_alloc (&sec->objfile->objfile_obstack,
sizeof (struct mips_extra_func_info));
- PROC_LOW_ADDR (proc_desc) = startaddr;
+ PROC_LOW_ADDR (proc_desc) = pdr_pc;
/* Only used for dummy frames. */
PROC_HIGH_ADDR (proc_desc) = 0;
extract_unsigned_integer (buf, MIPS_INSTLEN));
}
-
-/* Given PC at the function's start address, attempt to find the
- prologue end using SAL information. Return zero if the skip fails.
-
- A non-optimized prologue traditionally has one SAL for the function
- and a second for the function body. A single line function has
- them both pointing at the same line.
-
- An optimized prologue is similar but the prologue may contain
- instructions (SALs) from the instruction body. Need to skip those
- while not getting into the function body.
-
- The functions end point and an increasing SAL line are used as
- indicators of the prologue's endpoint.
-
- This code is based on the function refine_prologue_limit (versions
- found in both ia64 and ppc). */
-
-static CORE_ADDR
-skip_prologue_using_sal (CORE_ADDR func_addr)
-{
- struct symtab_and_line prologue_sal;
- CORE_ADDR start_pc;
- CORE_ADDR end_pc;
-
- /* Get an initial range for the function. */
- find_pc_partial_function (func_addr, NULL, &start_pc, &end_pc);
- start_pc += FUNCTION_START_OFFSET;
-
- prologue_sal = find_pc_line (start_pc, 0);
- if (prologue_sal.line != 0)
- {
- while (prologue_sal.end < end_pc)
- {
- struct symtab_and_line sal;
-
- sal = find_pc_line (prologue_sal.end, 0);
- if (sal.line == 0)
- break;
- /* Assume that a consecutive SAL for the same (or larger)
- line mark the prologue -> body transition. */
- if (sal.line >= prologue_sal.line)
- break;
- /* The case in which compiler's optimizer/scheduler has
- moved instructions into the prologue. We look ahead in
- the function looking for address ranges whose
- corresponding line number is less the first one that we
- found for the function. This is more conservative then
- refine_prologue_limit which scans a large number of SALs
- looking for any in the prologue */
- prologue_sal = sal;
- }
- }
- return prologue_sal.end;
-}
-
/* Skip the PC past function prologue instructions (32-bit version).
This is a helper function for mips_skip_prologue. */
/* Unwind the frame. */
set_gdbarch_unwind_pc (gdbarch, mips_unwind_pc);
- frame_unwind_append_sniffer (gdbarch, mips_mdebug_frame_sniffer);
set_gdbarch_unwind_dummy_id (gdbarch, mips_unwind_dummy_id);
- frame_base_append_sniffer (gdbarch, mips_mdebug_frame_base_sniffer);
/* Map debug register numbers onto internal register numbers. */
set_gdbarch_stab_reg_to_regnum (gdbarch, mips_stab_reg_to_regnum);
set_gdbarch_register_type (gdbarch, mips_register_type);
set_gdbarch_print_registers_info (gdbarch, mips_print_registers_info);
- set_gdbarch_pc_in_sigtramp (gdbarch, mips_pc_in_sigtramp);
+ set_gdbarch_deprecated_pc_in_sigtramp (gdbarch, mips_pc_in_sigtramp);
set_gdbarch_print_insn (gdbarch, gdb_print_insn_mips);
/* Hook in OS ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
+ /* Unwind the frame. */
+ frame_unwind_append_sniffer (gdbarch, mips_mdebug_frame_sniffer);
+ frame_base_append_sniffer (gdbarch, mips_mdebug_frame_base_sniffer);
+
return gdbarch;
}
gdbarch_register (bfd_arch_mips, mips_gdbarch_init, mips_dump_tdep);
+ mips_pdr_data = register_objfile_data ();
+
/* Add root prefix command for all "set mips"/"show mips" commands */
add_prefix_cmd ("mips", no_class, set_mips_command,
"Various MIPS specific commands.",
projects / deliverable / binutils-gdb.git / blobdiff