-/* 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
for (i = 0; pattern[i].mask; i++)
{
- insn[i] = read_memory_unsigned_integer (npc, 4);
+ char 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;
else
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;
}
Note that with a 2.4 64-bit kernel, the signal context is not properly
passed back to userspace so the unwind will not work correctly. */
static CORE_ADDR
-hppa_linux_sigtramp_find_sigcontext (CORE_ADDR sp)
+hppa_linux_sigtramp_find_sigcontext (CORE_ADDR pc)
{
unsigned int dummy[HPPA_MAX_INSN_PATTERN_LEN];
int offs = 0;
static int pcoffs[] = { 0, 4*4, 5*4 };
/* offsets to the rt_sigframe structure */
static int sfoffs[] = { 4*4, 10*4, 10*4 };
+ CORE_ADDR sp;
+
+ /* Most of the time, this will be correct. The one case when this will
+ fail is if the user defined an alternate stack, in which case the
+ beginning of the stack will not be align_down (pc, 64). */
+ sp = align_down (pc, 64);
/* rt_sigreturn trampoline:
3419000x ldi 0, %r25 or ldi 1, %r25 (x = 0 or 2)
}
if (offs == 0)
- return 0;
+ {
+ if (insns_match_pattern (pc, hppa_sigtramp, dummy))
+ {
+ /* sigaltstack case: we have no way of knowing which offset to
+ use in this case; default to new kernel handling. If this is
+ wrong the unwinding will fail. */
+ try = 2;
+ sp = pc - pcoffs[try];
+ }
+ else
+ {
+ return 0;
+ }
+ }
/* sp + sfoffs[try] points to a struct rt_sigframe, which contains
a struct siginfo and a struct ucontext. struct ucontext contains
{
struct gdbarch *gdbarch = get_frame_arch (next_frame);
struct hppa_linux_sigtramp_unwind_cache *info;
- CORE_ADDR sp, pc, scptr;
+ CORE_ADDR pc, scptr;
int i;
if (*this_cache)
info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
pc = frame_pc_unwind (next_frame);
- sp = (pc & ~63);
- scptr = hppa_linux_sigtramp_find_sigcontext (sp);
+ scptr = hppa_linux_sigtramp_find_sigcontext (pc);
/* structure of struct sigcontext:
info->saved_regs[HPPA_PCOQ_TAIL_REGNUM].addr = scptr;
scptr += 4;
- info->base = read_memory_unsigned_integer (
- info->saved_regs[HPPA_SP_REGNUM].addr, 4);
+ info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
return info;
}
int regnum, int *optimizedp,
enum lval_type *lvalp,
CORE_ADDR *addrp,
- int *realnump, void *bufferp)
+ int *realnump, void *valuep)
{
struct hppa_linux_sigtramp_unwind_cache *info
= hppa_linux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
- int pcoqt = (regnum == HPPA_PCOQ_TAIL_REGNUM);
-
- if (pcoqt)
- regnum = HPPA_PCOQ_HEAD_REGNUM;
-
- trad_frame_prev_register (next_frame, info->saved_regs, regnum,
- optimizedp, lvalp, addrp, realnump, bufferp);
-
- if (pcoqt)
- store_unsigned_integer (bufferp, 4,
- extract_unsigned_integer (bufferp, 4) + 4);
+ hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind hppa_linux_sigtramp_frame_unwind = {
hppa_linux_sigtramp_unwind_sniffer (struct frame_info *next_frame)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
- CORE_ADDR sp = (pc & ~63);
- if (hppa_linux_sigtramp_find_sigcontext (sp))
+ if (hppa_linux_sigtramp_find_sigcontext (pc))
return &hppa_linux_sigtramp_frame_unwind;
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