-/* Target-dependent code for Linux running on PA-RISC, for GDB.
+/* Target-dependent code for GNU/Linux running on PA-RISC, for GDB.
Copyright 2004 Free Software Foundation, Inc.
#include "frame-unwind.h"
#include "trad-frame.h"
#include "dwarf2-frame.h"
+#include "value.h"
#include "hppa-tdep.h"
+#include "elf/common.h"
+
#if 0
/* Convert DWARF register number REG to the appropriate register
number used by GDB. */
if (reg >= 32 && reg <= 85)
return HPPA_FP4_REGNUM + (reg - 32);
- warning ("Unmapped DWARF Register #%d encountered\n", reg);
+ warning (_("Unmapped DWARF Register #%d encountered."), reg);
return -1;
}
#endif
{
char buf[4];
- read_memory_nobpt (npc, buf, 4);
+ deprecated_read_memory_nobpt (npc, buf, 4);
insn[i] = extract_unsigned_integer (buf, 4);
if ((insn[i] & pattern[i].mask) == pattern[i].data)
npc += 4;
return 1;
}
+/* The relaxed version of the insn matcher allows us to match from somewhere
+ inside the pattern, by looking backwards in the instruction scheme. */
static int
-hppa_linux_in_dyncall (CORE_ADDR pc)
+insns_match_pattern_relaxed (CORE_ADDR pc,
+ struct insn_pattern *pattern,
+ unsigned int *insn)
{
- static CORE_ADDR dyncall = 0;
+ int pat_len = 0;
+ int offset;
- /* FIXME: if we switch exec files, dyncall should be reinitialized */
- if (!dyncall)
- {
- struct minimal_symbol *minsym;
+ while (pattern[pat_len].mask)
+ pat_len++;
- minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
- if (minsym)
- dyncall = SYMBOL_VALUE_ADDRESS (minsym);
- else
- dyncall = -1;
+ for (offset = 0; offset < pat_len; offset++)
+ {
+ if (insns_match_pattern (pc - offset * 4,
+ pattern, insn))
+ return 1;
}
- return pc == dyncall;
+ return 0;
+}
+
+static int
+hppa_linux_in_dyncall (CORE_ADDR pc)
+{
+ struct unwind_table_entry *u;
+ u = find_unwind_entry (hppa_symbol_address ("$$dyncall"));
+
+ if (!u)
+ return 0;
+
+ return pc >= u->region_start && pc <= u->region_end;
}
/* There are several kinds of "trampolines" that we need to deal with:
{
unsigned int insn[HPPA_MAX_INSN_PATTERN_LEN];
int r;
+ struct unwind_table_entry *u;
+
+ /* on hppa-linux, linker stubs have no unwind information. Since the pattern
+ matching for linker stubs can be quite slow, we try to avoid it if
+ we can. */
+ u = find_unwind_entry (pc);
r = in_plt_section (pc, name)
|| hppa_linux_in_dyncall (pc)
- || insns_match_pattern (pc, hppa_import_stub, insn)
- || insns_match_pattern (pc, hppa_import_pic_stub, insn)
- || insns_match_pattern (pc, hppa_long_branch_stub, insn)
- || insns_match_pattern (pc, hppa_long_branch_pic_stub, insn);
+ || (u == NULL
+ && (insns_match_pattern_relaxed (pc, hppa_import_stub, insn)
+ || insns_match_pattern_relaxed (pc, hppa_import_pic_stub, insn)
+ || insns_match_pattern_relaxed (pc, hppa_long_branch_stub, insn)
+ || insns_match_pattern_relaxed (pc, hppa_long_branch_pic_stub, insn)));
return r;
}
}
else
{
- error ("Cannot resolve plt stub at 0x%s\n",
+ error (_("Cannot resolve plt stub at 0x%s."),
paddr_nz (pc));
pc = 0;
}
return NULL;
}
+/* Attempt to find (and return) the global pointer for the given
+ function.
+
+ This is a rather nasty bit of code searchs for the .dynamic section
+ in the objfile corresponding to the pc of the function we're trying
+ to call. Once it finds the addresses at which the .dynamic section
+ lives in the child process, it scans the Elf32_Dyn entries for a
+ DT_PLTGOT tag. If it finds one of these, the corresponding
+ d_un.d_ptr value is the global pointer. */
+
+static CORE_ADDR
+hppa_linux_find_global_pointer (struct value *function)
+{
+ struct obj_section *faddr_sect;
+ CORE_ADDR faddr;
+
+ faddr = value_as_address (function);
+
+ /* Is this a plabel? If so, dereference it to get the gp value. */
+ if (faddr & 2)
+ {
+ int status;
+ char buf[4];
+
+ faddr &= ~3;
+
+ status = target_read_memory (faddr + 4, buf, sizeof (buf));
+ if (status == 0)
+ return extract_unsigned_integer (buf, sizeof (buf));
+ }
+
+ /* If the address is in the plt section, then the real function hasn't
+ yet been fixed up by the linker so we cannot determine the gp of
+ that function. */
+ if (in_plt_section (faddr, NULL))
+ return 0;
+
+ faddr_sect = find_pc_section (faddr);
+ if (faddr_sect != NULL)
+ {
+ struct obj_section *osect;
+
+ ALL_OBJFILE_OSECTIONS (faddr_sect->objfile, osect)
+ {
+ if (strcmp (osect->the_bfd_section->name, ".dynamic") == 0)
+ break;
+ }
+
+ if (osect < faddr_sect->objfile->sections_end)
+ {
+ CORE_ADDR addr;
+
+ addr = osect->addr;
+ while (addr < osect->endaddr)
+ {
+ int status;
+ LONGEST tag;
+ char buf[4];
+
+ status = target_read_memory (addr, buf, sizeof (buf));
+ if (status != 0)
+ break;
+ tag = extract_signed_integer (buf, sizeof (buf));
+
+ if (tag == DT_PLTGOT)
+ {
+ CORE_ADDR global_pointer;
+
+ status = target_read_memory (addr + 4, buf, sizeof (buf));
+ if (status != 0)
+ break;
+ global_pointer = extract_unsigned_integer (buf, sizeof (buf));
+
+ /* The payoff... */
+ return global_pointer;
+ }
+
+ if (tag == DT_NULL)
+ break;
+
+ addr += 8;
+ }
+ }
+ }
+ return 0;
+}
+
/* Forward declarations. */
extern initialize_file_ftype _initialize_hppa_linux_tdep;
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Linux is always ELF. */
+ /* GNU/Linux is always ELF. */
tdep->is_elf = 1;
+ tdep->find_global_pointer = hppa_linux_find_global_pointer;
+
set_gdbarch_write_pc (gdbarch, hppa_linux_target_write_pc);
frame_unwind_append_sniffer (gdbarch, hppa_linux_sigtramp_unwind_sniffer);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
- set_gdbarch_in_solib_call_trampoline
- (gdbarch, hppa_linux_in_solib_call_trampoline);
+ tdep->in_solib_call_trampoline = hppa_linux_in_solib_call_trampoline;
set_gdbarch_skip_trampoline_code
(gdbarch, hppa_linux_skip_trampoline_code);
/* GNU/Linux uses the dynamic linker included in the GNU C Library. */
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
+ /* On hppa-linux, currently, sizeof(long double) == 8. There has been
+ some discussions to support 128-bit long double, but it requires some
+ more work in gcc and glibc first. */
+ set_gdbarch_long_double_bit (gdbarch, 64);
+
#if 0
/* Dwarf-2 unwinding support. Not yet working. */
set_gdbarch_dwarf_reg_to_regnum (gdbarch, hppa_dwarf_reg_to_regnum);
frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
#endif
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
}
void
projects / deliverable / binutils-gdb.git / blobdiff