-/* Target-dependent code for NetBSD/Alpha.
- Copyright 2002 Free Software Foundation, Inc.
+/* Target-dependent code for NetBSD/alpha.
+
+ Copyright (C) 2002-2013 Free Software Foundation, Inc.
+
Contributed by Wasabi Systems, Inc.
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
+ 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,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
+#include "frame.h"
#include "gdbcore.h"
+#include "osabi.h"
+#include "regcache.h"
+#include "regset.h"
#include "value.h"
-#include "solib-svr4.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
#include "alpha-tdep.h"
+#include "alphabsd-tdep.h"
+#include "nbsd-tdep.h"
+#include "solib-svr4.h"
+#include "target.h"
+
+/* Core file support. */
+
+/* Even though NetBSD/alpha used ELF since day one, it used the
+ traditional a.out-style core dump format before NetBSD 1.6. */
+
+/* Sizeof `struct reg' in <machine/reg.h>. */
+#define ALPHANBSD_SIZEOF_GREGS (32 * 8)
-/* Fetch (and possibly build) an appropriate link_map_offsets
- structure for NetBSD/alpha targets using the struct offsets
- defined in <link.h> (but without actual reference to that file).
+/* Sizeof `struct fpreg' in <machine/reg.h. */
+#define ALPHANBSD_SIZEOF_FPREGS ((32 * 8) + 8)
- This makes it possible to access NetBSD/alpha shared libraries
- from a GDB that was not built on a NetBSD/alpha host (for cross
- debugging). */
+/* Supply register REGNUM from the buffer specified by FPREGS and LEN
+ in the floating-point register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
-static struct link_map_offsets *
-alphanbsd_solib_svr4_fetch_link_map_offsets (void)
+static void
+alphanbsd_supply_fpregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *fpregs, size_t len)
{
- static struct link_map_offsets lmo;
- static struct link_map_offsets *lmp = NULL;
+ const gdb_byte *regs = fpregs;
+ int i;
- if (lmp == NULL)
+ gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS);
+
+ for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++)
{
- lmp = &lmo;
+ if (regnum == i || regnum == -1)
+ regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8);
+ }
- lmo.r_debug_size = 32;
+ if (regnum == ALPHA_FPCR_REGNUM || regnum == -1)
+ regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8);
+}
+
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+ in the general-purpose register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
+
+static void
+alphanbsd_supply_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
+{
+ const gdb_byte *regs = gregs;
+ int i;
- lmo.r_map_offset = 8;
- lmo.r_map_size = 8;
+ gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
- lmo.link_map_size = 40;
+ for (i = 0; i < ALPHA_ZERO_REGNUM; i++)
+ {
+ if (regnum == i || regnum == -1)
+ regcache_raw_supply (regcache, i, regs + i * 8);
+ }
- lmo.l_addr_offset = 0;
- lmo.l_addr_size = 8;
+ if (regnum == ALPHA_PC_REGNUM || regnum == -1)
+ regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
+}
- lmo.l_name_offset = 8;
- lmo.l_name_size = 8;
+/* Supply register REGNUM from the buffer specified by GREGS and LEN
+ in the general-purpose register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
- lmo.l_next_offset = 24;
- lmo.l_next_size = 8;
+static void
+alphanbsd_aout_supply_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs, size_t len)
+{
+ const gdb_byte *regs = gregs;
+ int i;
- lmo.l_prev_offset = 32;
- lmo.l_prev_size = 8;
+ /* Table to map a GDB register number to a trapframe register index. */
+ static const int regmap[] =
+ {
+ 0, 1, 2, 3,
+ 4, 5, 6, 7,
+ 8, 9, 10, 11,
+ 12, 13, 14, 15,
+ 30, 31, 32, 16,
+ 17, 18, 19, 20,
+ 21, 22, 23, 24,
+ 25, 29, 26
+ };
+
+ gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
+
+ for (i = 0; i < ARRAY_SIZE(regmap); i++)
+ {
+ if (regnum == i || regnum == -1)
+ regcache_raw_supply (regcache, i, regs + regmap[i] * 8);
}
- return lmp;
+ if (regnum == ALPHA_PC_REGNUM || regnum == -1)
+ regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
+
+ if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
+ {
+ regs += ALPHANBSD_SIZEOF_GREGS;
+ len -= ALPHANBSD_SIZEOF_GREGS;
+ alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len);
+ }
}
+/* NetBSD/alpha register sets. */
+
+static struct regset alphanbsd_gregset =
+{
+ NULL,
+ alphanbsd_supply_gregset
+};
+
+static struct regset alphanbsd_fpregset =
+{
+ NULL,
+ alphanbsd_supply_fpregset
+};
+
+static struct regset alphanbsd_aout_gregset =
+{
+ NULL,
+ alphanbsd_aout_supply_gregset
+};
+
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
+
+const struct regset *
+alphanbsd_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ if (strcmp (sect_name, ".reg") == 0 && sect_size >= ALPHANBSD_SIZEOF_GREGS)
+ {
+ if (sect_size >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
+ return &alphanbsd_aout_gregset;
+ else
+ return &alphanbsd_gregset;
+ }
+
+ if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ALPHANBSD_SIZEOF_FPREGS)
+ return &alphanbsd_fpregset;
+
+ return NULL;
+}
+\f
+
+/* Signal trampolines. */
+
/* Under NetBSD/alpha, signal handler invocations can be identified by the
designated code sequence that is used to return from a signal handler.
In particular, the return address of a signal handler points to the
sequence and can then check whether we really are executing in the
signal trampoline. If not, -1 is returned, otherwise the offset from the
start of the return sequence is returned. */
-static const unsigned int sigtramp_retcode[] =
+static const unsigned char sigtramp_retcode[] =
{
- 0xa61e0000, /* ldq a0, 0(sp) */
- 0x23de0010, /* lda sp, 16(sp) */
- 0x201f0127, /* lda v0, 295(zero) */
- 0x00000083, /* call_pal callsys */
+ 0x00, 0x00, 0x1e, 0xa6, /* ldq a0, 0(sp) */
+ 0x10, 0x00, 0xde, 0x23, /* lda sp, 16(sp) */
+ 0x27, 0x01, 0x1f, 0x20, /* lda v0, 295(zero) */
+ 0x83, 0x00, 0x00, 0x00, /* call_pal callsys */
};
-#define RETCODE_NWORDS \
- (sizeof (sigtramp_retcode) / sizeof (sigtramp_retcode[0]))
+#define RETCODE_NWORDS 4
+#define RETCODE_SIZE (RETCODE_NWORDS * 4)
-LONGEST
-alphanbsd_sigtramp_offset (CORE_ADDR pc)
+static LONGEST
+alphanbsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- unsigned int ret[4], w;
+ unsigned char ret[RETCODE_SIZE], w[4];
LONGEST off;
int i;
- if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
+ if (target_read_memory (pc, (char *) w, 4) != 0)
return -1;
for (i = 0; i < RETCODE_NWORDS; i++)
{
- if (w == sigtramp_retcode[i])
+ if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0)
break;
}
if (i == RETCODE_NWORDS)
off = i * 4;
pc -= off;
- if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
+ if (target_read_memory (pc, (char *) ret, sizeof (ret)) != 0)
return -1;
- if (memcmp (ret, sigtramp_retcode, sizeof (sigtramp_retcode)) == 0)
+ if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0)
return off;
return -1;
}
+static int
+alphanbsd_pc_in_sigtramp (struct gdbarch *gdbarch,
+ CORE_ADDR pc, const char *func_name)
+{
+ return (nbsd_pc_in_sigtramp (pc, func_name)
+ || alphanbsd_sigtramp_offset (gdbarch, pc) >= 0);
+}
+
+static CORE_ADDR
+alphanbsd_sigcontext_addr (struct frame_info *frame)
+{
+ /* FIXME: This is not correct for all versions of NetBSD/alpha.
+ We will probably need to disassemble the trampoline to figure
+ out which trampoline frame type we have. */
+ if (!get_next_frame (frame))
+ return 0;
+ return get_frame_base (get_next_frame (frame));
+}
+\f
+
static void
alphanbsd_init_abi (struct gdbarch_info info,
struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ /* Hook into the DWARF CFI frame unwinder. */
+ alpha_dwarf2_init_abi (info, gdbarch);
+
+ /* Hook into the MDEBUG frame unwinder. */
+ alpha_mdebug_init_abi (info, gdbarch);
+
/* NetBSD/alpha does not provide single step support via ptrace(2); we
must use software single-stepping. */
set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
- set_solib_svr4_fetch_link_map_offsets (gdbarch,
- alphanbsd_solib_svr4_fetch_link_map_offsets);
+ /* NetBSD/alpha has SVR4-style shared libraries. */
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
+ tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp;
+ tdep->sigcontext_addr = alphanbsd_sigcontext_addr;
+
+ tdep->jb_pc = 2;
+ tdep->jb_elt_size = 8;
+
+ set_gdbarch_regset_from_core_section
+ (gdbarch, alphanbsd_regset_from_core_section);
}
+\f
+
+static enum gdb_osabi
+alphanbsd_core_osabi_sniffer (bfd *abfd)
+{
+ if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+ return GDB_OSABI_NETBSD_ELF;
+
+ return GDB_OSABI_UNKNOWN;
+}
+\f
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_alphanbsd_tdep (void);
void
_initialize_alphanbsd_tdep (void)
{
- alpha_gdbarch_register_os_abi (ALPHA_ABI_NETBSD, alphanbsd_init_abi);
+ /* BFD doesn't set a flavour for NetBSD style a.out core files. */
+ gdbarch_register_osabi_sniffer (bfd_arch_alpha, bfd_target_unknown_flavour,
+ alphanbsd_core_osabi_sniffer);
+
+ gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF,
+ alphanbsd_init_abi);
}
projects / deliverable / binutils-gdb.git / blobdiff