-/* 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.
+ Copyright (C) 2004, 2006 Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "gdbcore.h"
#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
unsigned int mask; /* ... with this mask. */
};
-/* See bfd/elf32-hppa.c */
-static struct insn_pattern hppa_long_branch_stub[] = {
- /* ldil LR'xxx,%r1 */
- { 0x20200000, 0xffe00000 },
- /* be,n RR'xxx(%sr4,%r1) */
- { 0xe0202002, 0xffe02002 },
- { 0, 0 }
-};
-
-static struct insn_pattern hppa_long_branch_pic_stub[] = {
- /* b,l .+8, %r1 */
- { 0xe8200000, 0xffe00000 },
- /* addil LR'xxx - ($PIC_pcrel$0 - 4), %r1 */
- { 0x28200000, 0xffe00000 },
- /* be,n RR'xxxx - ($PIC_pcrel$0 - 8)(%sr4, %r1) */
- { 0xe0202002, 0xffe02002 },
- { 0, 0 }
-};
-
-static struct insn_pattern hppa_import_stub[] = {
- /* addil LR'xxx, %dp */
- { 0x2b600000, 0xffe00000 },
- /* ldw RR'xxx(%r1), %r21 */
- { 0x48350000, 0xffffb000 },
- /* bv %r0(%r21) */
- { 0xeaa0c000, 0xffffffff },
- /* ldw RR'xxx+4(%r1), %r19 */
- { 0x48330000, 0xffffb000 },
- { 0, 0 }
-};
-
-static struct insn_pattern hppa_import_pic_stub[] = {
- /* addil LR'xxx,%r19 */
- { 0x2a600000, 0xffe00000 },
- /* ldw RR'xxx(%r1),%r21 */
- { 0x48350000, 0xffffb000 },
- /* bv %r0(%r21) */
- { 0xeaa0c000, 0xffffffff },
- /* ldw RR'xxx+4(%r1),%r19 */
- { 0x48330000, 0xffffb000 },
- { 0, 0 },
-};
-
-static struct insn_pattern hppa_plt_stub[] = {
- /* b,l 1b, %r20 - 1b is 3 insns before here */
- { 0xea9f1fdd, 0xffffffff },
- /* depi 0,31,2,%r20 */
- { 0xd6801c1e, 0xffffffff },
- { 0, 0 }
-};
-
static struct insn_pattern hppa_sigtramp[] = {
/* ldi 0, %r25 or ldi 1, %r25 */
{ 0x34190000, 0xfffffffd },
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;
}
-static int
-hppa_linux_in_dyncall (CORE_ADDR pc)
-{
- static CORE_ADDR dyncall = 0;
-
- /* FIXME: if we switch exec files, dyncall should be reinitialized */
- if (!dyncall)
- {
- struct minimal_symbol *minsym;
-
- minsym = lookup_minimal_symbol ("$$dyncall", NULL, NULL);
- if (minsym)
- dyncall = SYMBOL_VALUE_ADDRESS (minsym);
- else
- dyncall = -1;
- }
-
- return pc == dyncall;
-}
-
-/* There are several kinds of "trampolines" that we need to deal with:
- - long branch stubs: these are inserted by the linker when a branch
- target is too far away for a branch insn to reach
- - plt stubs: these should go into the .plt section, so are easy to find
- - import stubs: used to call from object to shared lib or shared lib to
- shared lib; these go in regular text sections. In fact the linker tries
- to put them throughout the code because branches have limited reachability.
- We use the same mechanism as ppc64 to recognize the stub insn patterns.
- - $$dyncall: similar to hpux, hppa-linux uses $$dyncall for indirect function
- calls. $$dyncall is exported by libgcc.a */
-static int
-hppa_linux_in_solib_call_trampoline (CORE_ADDR pc, char *name)
-{
- unsigned int insn[HPPA_MAX_INSN_PATTERN_LEN];
- int r;
-
- 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);
-
- return r;
-}
-
-static CORE_ADDR
-hppa_linux_skip_trampoline_code (CORE_ADDR pc)
-{
- unsigned int insn[HPPA_MAX_INSN_PATTERN_LEN];
- int dp_rel, pic_rel;
-
- /* dyncall handles both PLABELs and direct addresses */
- if (hppa_linux_in_dyncall (pc))
- {
- pc = (CORE_ADDR) read_register (22);
-
- /* PLABELs have bit 30 set; if it's a PLABEL, then dereference it */
- if (pc & 0x2)
- pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
-
- return pc;
- }
-
- dp_rel = pic_rel = 0;
- if ((dp_rel = insns_match_pattern (pc, hppa_import_stub, insn))
- || (pic_rel = insns_match_pattern (pc, hppa_import_pic_stub, insn)))
- {
- /* Extract the target address from the addil/ldw sequence. */
- pc = hppa_extract_21 (insn[0]) + hppa_extract_14 (insn[1]);
-
- if (dp_rel)
- pc += (CORE_ADDR) read_register (27);
- else
- pc += (CORE_ADDR) read_register (19);
-
- /* fallthrough */
- }
-
- if (in_plt_section (pc, NULL))
- {
- pc = (CORE_ADDR) read_memory_integer (pc, TARGET_PTR_BIT / 8);
-
- /* if the plt slot has not yet been resolved, the target will
- be the plt stub */
- if (in_plt_section (pc, NULL))
- {
- /* Sanity check: are we pointing to the plt stub? */
- if (insns_match_pattern (pc, hppa_plt_stub, insn))
- {
- /* this should point to the fixup routine */
- pc = (CORE_ADDR) read_memory_integer (pc + 8, TARGET_PTR_BIT / 8);
- }
- else
- {
- error ("Cannot resolve plt stub at 0x%s\n",
- paddr_nz (pc));
- pc = 0;
- }
- }
- }
-
- return pc;
-}
-
/* Signal frames. */
/* (This is derived from MD_FALLBACK_FRAME_STATE_FOR in gcc.)
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 *valuep)
+ int *realnump, gdb_byte *valuep)
{
struct hppa_linux_sigtramp_unwind_cache *info
= hppa_linux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
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);
- set_gdbarch_skip_trampoline_code
- (gdbarch, hppa_linux_skip_trampoline_code);
+ tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline;
+ set_gdbarch_skip_trampoline_code (gdbarch, hppa_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