-/* 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, 2007 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 3 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, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbcore.h"
#include "frame-unwind.h"
#include "trad-frame.h"
#include "dwarf2-frame.h"
+#include "value.h"
+#include "regset.h"
+#include "regcache.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
static void
-hppa_linux_target_write_pc (CORE_ADDR v, ptid_t ptid)
+hppa_linux_target_write_pc (struct regcache *regcache, CORE_ADDR v)
{
/* Probably this should be done by the kernel, but it isn't. */
- write_register_pid (HPPA_PCOQ_HEAD_REGNUM, v | 0x3, ptid);
- write_register_pid (HPPA_PCOQ_TAIL_REGNUM, (v + 4) | 0x3, ptid);
+ regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_HEAD_REGNUM, v | 0x3);
+ regcache_cooked_write_unsigned (regcache, HPPA_PCOQ_TAIL_REGNUM, (v + 4) | 0x3);
}
/* An instruction to match. */
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 },
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.)
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);
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;
+}
+\f
+/*
+ * Registers saved in a coredump:
+ * gr0..gr31
+ * sr0..sr7
+ * iaoq0..iaoq1
+ * iasq0..iasq1
+ * sar, iir, isr, ior, ipsw
+ * cr0, cr24..cr31
+ * cr8,9,12,13
+ * cr10, cr15
+ */
+
+#define GR_REGNUM(_n) (HPPA_R0_REGNUM+_n)
+#define TR_REGNUM(_n) (HPPA_TR0_REGNUM+_n)
+static const int greg_map[] =
+ {
+ GR_REGNUM(0), GR_REGNUM(1), GR_REGNUM(2), GR_REGNUM(3),
+ GR_REGNUM(4), GR_REGNUM(5), GR_REGNUM(6), GR_REGNUM(7),
+ GR_REGNUM(8), GR_REGNUM(9), GR_REGNUM(10), GR_REGNUM(11),
+ GR_REGNUM(12), GR_REGNUM(13), GR_REGNUM(14), GR_REGNUM(15),
+ GR_REGNUM(16), GR_REGNUM(17), GR_REGNUM(18), GR_REGNUM(19),
+ GR_REGNUM(20), GR_REGNUM(21), GR_REGNUM(22), GR_REGNUM(23),
+ GR_REGNUM(24), GR_REGNUM(25), GR_REGNUM(26), GR_REGNUM(27),
+ GR_REGNUM(28), GR_REGNUM(29), GR_REGNUM(30), GR_REGNUM(31),
+
+ HPPA_SR4_REGNUM+1, HPPA_SR4_REGNUM+2, HPPA_SR4_REGNUM+3, HPPA_SR4_REGNUM+4,
+ HPPA_SR4_REGNUM, HPPA_SR4_REGNUM+5, HPPA_SR4_REGNUM+6, HPPA_SR4_REGNUM+7,
+
+ HPPA_PCOQ_HEAD_REGNUM, HPPA_PCOQ_TAIL_REGNUM,
+ HPPA_PCSQ_HEAD_REGNUM, HPPA_PCSQ_TAIL_REGNUM,
+
+ HPPA_SAR_REGNUM, HPPA_IIR_REGNUM, HPPA_ISR_REGNUM, HPPA_IOR_REGNUM,
+ HPPA_IPSW_REGNUM, HPPA_RCR_REGNUM,
+
+ TR_REGNUM(0), TR_REGNUM(1), TR_REGNUM(2), TR_REGNUM(3),
+ TR_REGNUM(4), TR_REGNUM(5), TR_REGNUM(6), TR_REGNUM(7),
+
+ HPPA_PID0_REGNUM, HPPA_PID1_REGNUM, HPPA_PID2_REGNUM, HPPA_PID3_REGNUM,
+ HPPA_CCR_REGNUM, HPPA_EIEM_REGNUM,
+ };
+
+static void
+hppa_linux_supply_regset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *regs, size_t len)
+{
+ struct gdbarch *arch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (arch);
+ const char *buf = regs;
+ int i, offset;
+
+ offset = 0;
+ for (i = 0; i < ARRAY_SIZE (greg_map); i++)
+ {
+ if (regnum == greg_map[i] || regnum == -1)
+ regcache_raw_supply (regcache, greg_map[i], buf + offset);
+
+ offset += tdep->bytes_per_address;
+ }
+}
+
+static void
+hppa_linux_supply_fpregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *regs, size_t len)
+{
+ const char *buf = regs;
+ int i, offset;
+
+ offset = 0;
+ for (i = 0; i < 31; i++)
+ {
+ if (regnum == HPPA_FP0_REGNUM + i || regnum == -1)
+ regcache_raw_supply (regcache, HPPA_FP0_REGNUM + i,
+ buf + offset);
+ offset += 8;
+ }
+}
+
+/* HPPA Linux kernel register set. */
+static struct regset hppa_linux_regset =
+{
+ NULL,
+ hppa_linux_supply_regset
+};
+
+static struct regset hppa_linux_fpregset =
+{
+ NULL,
+ hppa_linux_supply_fpregset
+};
+
+static const struct regset *
+hppa_linux_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name,
+ size_t sect_size)
+{
+ if (strcmp (sect_name, ".reg") == 0)
+ return &hppa_linux_regset;
+ else if (strcmp (sect_name, ".reg2") == 0)
+ return &hppa_linux_fpregset;
+
+ return NULL;
+}
+\f
+
/* 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);
more work in gcc and glibc first. */
set_gdbarch_long_double_bit (gdbarch, 64);
+ set_gdbarch_regset_from_core_section
+ (gdbarch, hppa_linux_regset_from_core_section);
+
#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
_initialize_hppa_linux_tdep (void)
{
gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_LINUX, hppa_linux_init_abi);
+ gdbarch_register_osabi (bfd_arch_hppa, bfd_mach_hppa20w, GDB_OSABI_LINUX, hppa_linux_init_abi);
}
projects / deliverable / binutils-gdb.git / blobdiff