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b546247c05
* hppa-linux-tdep.c (insns_match_pattern_relaxed): New function. (hppa_linux_in_dyncall): Check that we are inside the range of $$dyncall, not necessarily at the first insn. (hppa_linux_in_solib_call_trampoline): Identify a trampoline even if the pc does not point to the first insn of the trampoline.
628 lines
18 KiB
C
628 lines
18 KiB
C
/* Target-dependent code for GNU/Linux running on PA-RISC, for GDB.
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Copyright 2004 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "target.h"
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#include "objfiles.h"
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#include "solib-svr4.h"
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#include "glibc-tdep.h"
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#include "frame-unwind.h"
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#include "trad-frame.h"
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#include "dwarf2-frame.h"
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#include "value.h"
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#include "hppa-tdep.h"
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#include "elf/common.h"
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#if 0
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/* Convert DWARF register number REG to the appropriate register
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number used by GDB. */
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static int
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hppa_dwarf_reg_to_regnum (int reg)
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{
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/* registers 0 - 31 are the same in both sets */
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if (reg < 32)
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return reg;
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/* dwarf regs 32 to 85 are fpregs 4 - 31 */
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if (reg >= 32 && reg <= 85)
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return HPPA_FP4_REGNUM + (reg - 32);
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warning ("Unmapped DWARF Register #%d encountered\n", reg);
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return -1;
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}
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#endif
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static void
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hppa_linux_target_write_pc (CORE_ADDR v, ptid_t ptid)
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{
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/* Probably this should be done by the kernel, but it isn't. */
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write_register_pid (HPPA_PCOQ_HEAD_REGNUM, v | 0x3, ptid);
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write_register_pid (HPPA_PCOQ_TAIL_REGNUM, (v + 4) | 0x3, ptid);
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}
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/* An instruction to match. */
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struct insn_pattern
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{
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unsigned int data; /* See if it matches this.... */
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unsigned int mask; /* ... with this mask. */
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};
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/* See bfd/elf32-hppa.c */
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static struct insn_pattern hppa_long_branch_stub[] = {
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/* ldil LR'xxx,%r1 */
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{ 0x20200000, 0xffe00000 },
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/* be,n RR'xxx(%sr4,%r1) */
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{ 0xe0202002, 0xffe02002 },
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{ 0, 0 }
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};
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static struct insn_pattern hppa_long_branch_pic_stub[] = {
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/* b,l .+8, %r1 */
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{ 0xe8200000, 0xffe00000 },
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/* addil LR'xxx - ($PIC_pcrel$0 - 4), %r1 */
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{ 0x28200000, 0xffe00000 },
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/* be,n RR'xxxx - ($PIC_pcrel$0 - 8)(%sr4, %r1) */
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{ 0xe0202002, 0xffe02002 },
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{ 0, 0 }
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};
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static struct insn_pattern hppa_import_stub[] = {
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/* addil LR'xxx, %dp */
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{ 0x2b600000, 0xffe00000 },
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/* ldw RR'xxx(%r1), %r21 */
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{ 0x48350000, 0xffffb000 },
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/* bv %r0(%r21) */
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{ 0xeaa0c000, 0xffffffff },
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/* ldw RR'xxx+4(%r1), %r19 */
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{ 0x48330000, 0xffffb000 },
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{ 0, 0 }
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};
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static struct insn_pattern hppa_import_pic_stub[] = {
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/* addil LR'xxx,%r19 */
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{ 0x2a600000, 0xffe00000 },
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/* ldw RR'xxx(%r1),%r21 */
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{ 0x48350000, 0xffffb000 },
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/* bv %r0(%r21) */
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{ 0xeaa0c000, 0xffffffff },
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/* ldw RR'xxx+4(%r1),%r19 */
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{ 0x48330000, 0xffffb000 },
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{ 0, 0 },
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};
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static struct insn_pattern hppa_plt_stub[] = {
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/* b,l 1b, %r20 - 1b is 3 insns before here */
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{ 0xea9f1fdd, 0xffffffff },
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/* depi 0,31,2,%r20 */
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{ 0xd6801c1e, 0xffffffff },
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{ 0, 0 }
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};
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static struct insn_pattern hppa_sigtramp[] = {
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/* ldi 0, %r25 or ldi 1, %r25 */
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{ 0x34190000, 0xfffffffd },
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/* ldi __NR_rt_sigreturn, %r20 */
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{ 0x3414015a, 0xffffffff },
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/* be,l 0x100(%sr2, %r0), %sr0, %r31 */
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{ 0xe4008200, 0xffffffff },
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/* nop */
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{ 0x08000240, 0xffffffff },
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{ 0, 0 }
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};
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#define HPPA_MAX_INSN_PATTERN_LEN (4)
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/* Return non-zero if the instructions at PC match the series
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described in PATTERN, or zero otherwise. PATTERN is an array of
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'struct insn_pattern' objects, terminated by an entry whose mask is
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zero.
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When the match is successful, fill INSN[i] with what PATTERN[i]
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matched. */
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static int
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insns_match_pattern (CORE_ADDR pc,
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struct insn_pattern *pattern,
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unsigned int *insn)
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{
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int i;
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CORE_ADDR npc = pc;
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for (i = 0; pattern[i].mask; i++)
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{
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char buf[4];
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deprecated_read_memory_nobpt (npc, buf, 4);
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insn[i] = extract_unsigned_integer (buf, 4);
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if ((insn[i] & pattern[i].mask) == pattern[i].data)
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npc += 4;
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else
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return 0;
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}
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return 1;
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}
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/* The relaxed version of the insn matcher allows us to match from somewhere
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inside the pattern, by looking backwards in the instruction scheme. */
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static int
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insns_match_pattern_relaxed (CORE_ADDR pc,
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struct insn_pattern *pattern,
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unsigned int *insn)
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{
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int pat_len = 0;
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int offset;
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while (pattern[pat_len].mask)
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pat_len++;
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for (offset = 0; offset < pat_len; offset++)
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{
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if (insns_match_pattern (pc - offset * 4,
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pattern, insn))
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return 1;
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}
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return 0;
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}
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static int
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hppa_linux_in_dyncall (CORE_ADDR pc)
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{
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struct unwind_table_entry *u;
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u = find_unwind_entry (hppa_symbol_address ("$$dyncall"));
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if (!u)
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return 0;
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return pc >= u->region_start && pc <= u->region_end;
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}
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/* There are several kinds of "trampolines" that we need to deal with:
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- long branch stubs: these are inserted by the linker when a branch
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target is too far away for a branch insn to reach
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- plt stubs: these should go into the .plt section, so are easy to find
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- import stubs: used to call from object to shared lib or shared lib to
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shared lib; these go in regular text sections. In fact the linker tries
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to put them throughout the code because branches have limited reachability.
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We use the same mechanism as ppc64 to recognize the stub insn patterns.
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- $$dyncall: similar to hpux, hppa-linux uses $$dyncall for indirect function
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calls. $$dyncall is exported by libgcc.a */
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static int
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hppa_linux_in_solib_call_trampoline (CORE_ADDR pc, char *name)
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{
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unsigned int insn[HPPA_MAX_INSN_PATTERN_LEN];
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int r;
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struct unwind_table_entry *u;
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/* on hppa-linux, linker stubs have no unwind information. Since the pattern
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matching for linker stubs can be quite slow, we try to avoid it if
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we can. */
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u = find_unwind_entry (pc);
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r = in_plt_section (pc, name)
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|| hppa_linux_in_dyncall (pc)
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|| (u == NULL
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&& (insns_match_pattern_relaxed (pc, hppa_import_stub, insn)
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|| insns_match_pattern_relaxed (pc, hppa_import_pic_stub, insn)
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|| insns_match_pattern_relaxed (pc, hppa_long_branch_stub, insn)
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|| insns_match_pattern_relaxed (pc, hppa_long_branch_pic_stub, insn)));
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return r;
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}
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static CORE_ADDR
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hppa_linux_skip_trampoline_code (CORE_ADDR pc)
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{
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unsigned int insn[HPPA_MAX_INSN_PATTERN_LEN];
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int dp_rel, pic_rel;
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/* dyncall handles both PLABELs and direct addresses */
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if (hppa_linux_in_dyncall (pc))
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{
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pc = (CORE_ADDR) read_register (22);
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/* PLABELs have bit 30 set; if it's a PLABEL, then dereference it */
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if (pc & 0x2)
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pc = (CORE_ADDR) read_memory_integer (pc & ~0x3, TARGET_PTR_BIT / 8);
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return pc;
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}
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dp_rel = pic_rel = 0;
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if ((dp_rel = insns_match_pattern (pc, hppa_import_stub, insn))
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|| (pic_rel = insns_match_pattern (pc, hppa_import_pic_stub, insn)))
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{
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/* Extract the target address from the addil/ldw sequence. */
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pc = hppa_extract_21 (insn[0]) + hppa_extract_14 (insn[1]);
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if (dp_rel)
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pc += (CORE_ADDR) read_register (27);
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else
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pc += (CORE_ADDR) read_register (19);
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/* fallthrough */
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}
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if (in_plt_section (pc, NULL))
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{
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pc = (CORE_ADDR) read_memory_integer (pc, TARGET_PTR_BIT / 8);
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/* if the plt slot has not yet been resolved, the target will
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be the plt stub */
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if (in_plt_section (pc, NULL))
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{
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/* Sanity check: are we pointing to the plt stub? */
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if (insns_match_pattern (pc, hppa_plt_stub, insn))
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{
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/* this should point to the fixup routine */
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pc = (CORE_ADDR) read_memory_integer (pc + 8, TARGET_PTR_BIT / 8);
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}
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else
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{
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error ("Cannot resolve plt stub at 0x%s\n",
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paddr_nz (pc));
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pc = 0;
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}
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}
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}
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return pc;
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}
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/* Signal frames. */
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/* (This is derived from MD_FALLBACK_FRAME_STATE_FOR in gcc.)
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Unfortunately, because of various bugs and changes to the kernel,
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we have several cases to deal with.
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In 2.4, the signal trampoline is 4 bytes, and pc should point directly at
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the beginning of the trampoline and struct rt_sigframe.
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In <= 2.6.5-rc2-pa3, the signal trampoline is 9 bytes, and pc points at
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the 4th word in the trampoline structure. This is wrong, it should point
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at the 5th word. This is fixed in 2.6.5-rc2-pa4.
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To detect these cases, we first take pc, align it to 64-bytes
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to get the beginning of the signal frame, and then check offsets 0, 4
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and 5 to see if we found the beginning of the trampoline. This will
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tell us how to locate the sigcontext structure.
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Note that with a 2.4 64-bit kernel, the signal context is not properly
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passed back to userspace so the unwind will not work correctly. */
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static CORE_ADDR
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hppa_linux_sigtramp_find_sigcontext (CORE_ADDR pc)
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{
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unsigned int dummy[HPPA_MAX_INSN_PATTERN_LEN];
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int offs = 0;
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int try;
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/* offsets to try to find the trampoline */
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static int pcoffs[] = { 0, 4*4, 5*4 };
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/* offsets to the rt_sigframe structure */
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static int sfoffs[] = { 4*4, 10*4, 10*4 };
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CORE_ADDR sp;
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/* Most of the time, this will be correct. The one case when this will
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fail is if the user defined an alternate stack, in which case the
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beginning of the stack will not be align_down (pc, 64). */
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sp = align_down (pc, 64);
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/* rt_sigreturn trampoline:
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3419000x ldi 0, %r25 or ldi 1, %r25 (x = 0 or 2)
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3414015a ldi __NR_rt_sigreturn, %r20
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e4008200 be,l 0x100(%sr2, %r0), %sr0, %r31
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08000240 nop */
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for (try = 0; try < ARRAY_SIZE (pcoffs); try++)
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{
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if (insns_match_pattern (sp + pcoffs[try], hppa_sigtramp, dummy))
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{
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offs = sfoffs[try];
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break;
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}
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}
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if (offs == 0)
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{
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if (insns_match_pattern (pc, hppa_sigtramp, dummy))
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{
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/* sigaltstack case: we have no way of knowing which offset to
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use in this case; default to new kernel handling. If this is
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wrong the unwinding will fail. */
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try = 2;
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sp = pc - pcoffs[try];
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}
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else
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{
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return 0;
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}
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}
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/* sp + sfoffs[try] points to a struct rt_sigframe, which contains
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a struct siginfo and a struct ucontext. struct ucontext contains
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a struct sigcontext. Return an offset to this sigcontext here. Too
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bad we cannot include system specific headers :-(.
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sizeof(struct siginfo) == 128
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offsetof(struct ucontext, uc_mcontext) == 24. */
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return sp + sfoffs[try] + 128 + 24;
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}
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struct hppa_linux_sigtramp_unwind_cache
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{
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CORE_ADDR base;
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struct trad_frame_saved_reg *saved_regs;
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};
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static struct hppa_linux_sigtramp_unwind_cache *
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hppa_linux_sigtramp_frame_unwind_cache (struct frame_info *next_frame,
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void **this_cache)
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{
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struct gdbarch *gdbarch = get_frame_arch (next_frame);
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struct hppa_linux_sigtramp_unwind_cache *info;
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CORE_ADDR pc, scptr;
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int i;
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if (*this_cache)
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return *this_cache;
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info = FRAME_OBSTACK_ZALLOC (struct hppa_linux_sigtramp_unwind_cache);
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*this_cache = info;
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info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
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pc = frame_pc_unwind (next_frame);
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scptr = hppa_linux_sigtramp_find_sigcontext (pc);
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/* structure of struct sigcontext:
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struct sigcontext {
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unsigned long sc_flags;
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unsigned long sc_gr[32];
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unsigned long long sc_fr[32];
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unsigned long sc_iasq[2];
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unsigned long sc_iaoq[2];
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unsigned long sc_sar; */
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/* Skip sc_flags. */
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scptr += 4;
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/* GR[0] is the psw, we don't restore that. */
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scptr += 4;
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/* General registers. */
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for (i = 1; i < 32; i++)
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{
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info->saved_regs[HPPA_R0_REGNUM + i].addr = scptr;
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scptr += 4;
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}
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/* Pad. */
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scptr += 4;
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/* FP regs; FP0-3 are not restored. */
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scptr += (8 * 4);
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for (i = 4; i < 32; i++)
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{
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info->saved_regs[HPPA_FP0_REGNUM + (i * 2)].addr = scptr;
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scptr += 4;
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info->saved_regs[HPPA_FP0_REGNUM + (i * 2) + 1].addr = scptr;
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scptr += 4;
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}
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/* IASQ/IAOQ. */
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info->saved_regs[HPPA_PCSQ_HEAD_REGNUM].addr = scptr;
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scptr += 4;
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info->saved_regs[HPPA_PCSQ_TAIL_REGNUM].addr = scptr;
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scptr += 4;
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info->saved_regs[HPPA_PCOQ_HEAD_REGNUM].addr = scptr;
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scptr += 4;
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info->saved_regs[HPPA_PCOQ_TAIL_REGNUM].addr = scptr;
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scptr += 4;
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info->base = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
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return info;
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}
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static void
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hppa_linux_sigtramp_frame_this_id (struct frame_info *next_frame,
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void **this_prologue_cache,
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struct frame_id *this_id)
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{
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struct hppa_linux_sigtramp_unwind_cache *info
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= hppa_linux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
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*this_id = frame_id_build (info->base, frame_pc_unwind (next_frame));
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}
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static void
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hppa_linux_sigtramp_frame_prev_register (struct frame_info *next_frame,
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void **this_prologue_cache,
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int regnum, int *optimizedp,
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enum lval_type *lvalp,
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CORE_ADDR *addrp,
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int *realnump, void *valuep)
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{
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struct hppa_linux_sigtramp_unwind_cache *info
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= hppa_linux_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
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hppa_frame_prev_register_helper (next_frame, info->saved_regs, regnum,
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optimizedp, lvalp, addrp, realnump, valuep);
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}
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static const struct frame_unwind hppa_linux_sigtramp_frame_unwind = {
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SIGTRAMP_FRAME,
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hppa_linux_sigtramp_frame_this_id,
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hppa_linux_sigtramp_frame_prev_register
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};
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/* hppa-linux always uses "new-style" rt-signals. The signal handler's return
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address should point to a signal trampoline on the stack. The signal
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trampoline is embedded in a rt_sigframe structure that is aligned on
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the stack. We take advantage of the fact that sp must be 64-byte aligned,
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and the trampoline is small, so by rounding down the trampoline address
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we can find the beginning of the struct rt_sigframe. */
|
|
static const struct frame_unwind *
|
|
hppa_linux_sigtramp_unwind_sniffer (struct frame_info *next_frame)
|
|
{
|
|
CORE_ADDR pc = frame_pc_unwind (next_frame);
|
|
|
|
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;
|
|
|
|
static void
|
|
hppa_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
/* 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);
|
|
|
|
/* GNU/Linux uses SVR4-style shared libraries. */
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
|
|
|
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);
|
|
set_gdbarch_dwarf2_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
|
|
}
|
|
|
|
void
|
|
_initialize_hppa_linux_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_LINUX, hppa_linux_init_abi);
|
|
}
|