61baf725ec
This applies the second part of GDB's End of Year Procedure, which
updates the copyright year range in all of GDB's files.
gdb/ChangeLog:
Update copyright year range in all GDB files.
400 lines
11 KiB
C
400 lines
11 KiB
C
/* Target-dependent code for GNU/Linux on Alpha.
|
|
Copyright (C) 2002-2017 Free Software Foundation, 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 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.
|
|
|
|
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 "frame.h"
|
|
#include "osabi.h"
|
|
#include "solib-svr4.h"
|
|
#include "symtab.h"
|
|
#include "regset.h"
|
|
#include "regcache.h"
|
|
#include "linux-tdep.h"
|
|
#include "alpha-tdep.h"
|
|
|
|
/* This enum represents the signals' numbers on the Alpha
|
|
architecture. It just contains the signal definitions which are
|
|
different from the generic implementation.
|
|
|
|
It is derived from the file <arch/alpha/include/uapi/asm/signal.h>,
|
|
from the Linux kernel tree. */
|
|
|
|
enum
|
|
{
|
|
/* SIGABRT is the same as in the generic implementation, but is
|
|
defined here because SIGIOT depends on it. */
|
|
ALPHA_LINUX_SIGABRT = 6,
|
|
ALPHA_LINUX_SIGEMT = 7,
|
|
ALPHA_LINUX_SIGBUS = 10,
|
|
ALPHA_LINUX_SIGSYS = 12,
|
|
ALPHA_LINUX_SIGURG = 16,
|
|
ALPHA_LINUX_SIGSTOP = 17,
|
|
ALPHA_LINUX_SIGTSTP = 18,
|
|
ALPHA_LINUX_SIGCONT = 19,
|
|
ALPHA_LINUX_SIGCHLD = 20,
|
|
ALPHA_LINUX_SIGIO = 23,
|
|
ALPHA_LINUX_SIGINFO = 29,
|
|
ALPHA_LINUX_SIGUSR1 = 30,
|
|
ALPHA_LINUX_SIGUSR2 = 31,
|
|
ALPHA_LINUX_SIGPOLL = ALPHA_LINUX_SIGIO,
|
|
ALPHA_LINUX_SIGPWR = ALPHA_LINUX_SIGINFO,
|
|
ALPHA_LINUX_SIGIOT = ALPHA_LINUX_SIGABRT,
|
|
};
|
|
|
|
/* Under GNU/Linux, 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 a sequence that copies $sp to $16, loads $0 with the
|
|
appropriate syscall number, and finally enters the kernel.
|
|
|
|
This is somewhat complicated in that:
|
|
(1) the expansion of the "mov" assembler macro has changed over
|
|
time, from "bis src,src,dst" to "bis zero,src,dst",
|
|
(2) the kernel has changed from using "addq" to "lda" to load the
|
|
syscall number,
|
|
(3) there is a "normal" sigreturn and an "rt" sigreturn which
|
|
has a different stack layout. */
|
|
|
|
static long
|
|
alpha_linux_sigtramp_offset_1 (struct gdbarch *gdbarch, CORE_ADDR pc)
|
|
{
|
|
switch (alpha_read_insn (gdbarch, pc))
|
|
{
|
|
case 0x47de0410: /* bis $30,$30,$16 */
|
|
case 0x47fe0410: /* bis $31,$30,$16 */
|
|
return 0;
|
|
|
|
case 0x43ecf400: /* addq $31,103,$0 */
|
|
case 0x201f0067: /* lda $0,103($31) */
|
|
case 0x201f015f: /* lda $0,351($31) */
|
|
return 4;
|
|
|
|
case 0x00000083: /* call_pal callsys */
|
|
return 8;
|
|
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static LONGEST
|
|
alpha_linux_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
|
|
{
|
|
long i, off;
|
|
|
|
if (pc & 3)
|
|
return -1;
|
|
|
|
/* Guess where we might be in the sequence. */
|
|
off = alpha_linux_sigtramp_offset_1 (gdbarch, pc);
|
|
if (off < 0)
|
|
return -1;
|
|
|
|
/* Verify that the other two insns of the sequence are as we expect. */
|
|
pc -= off;
|
|
for (i = 0; i < 12; i += 4)
|
|
{
|
|
if (i == off)
|
|
continue;
|
|
if (alpha_linux_sigtramp_offset_1 (gdbarch, pc + i) != i)
|
|
return -1;
|
|
}
|
|
|
|
return off;
|
|
}
|
|
|
|
static int
|
|
alpha_linux_pc_in_sigtramp (struct gdbarch *gdbarch,
|
|
CORE_ADDR pc, const char *func_name)
|
|
{
|
|
return alpha_linux_sigtramp_offset (gdbarch, pc) >= 0;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
alpha_linux_sigcontext_addr (struct frame_info *this_frame)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
CORE_ADDR pc;
|
|
ULONGEST sp;
|
|
long off;
|
|
|
|
pc = get_frame_pc (this_frame);
|
|
sp = get_frame_register_unsigned (this_frame, ALPHA_SP_REGNUM);
|
|
|
|
off = alpha_linux_sigtramp_offset (gdbarch, pc);
|
|
gdb_assert (off >= 0);
|
|
|
|
/* __NR_rt_sigreturn has a couple of structures on the stack. This is:
|
|
|
|
struct rt_sigframe {
|
|
struct siginfo info;
|
|
struct ucontext uc;
|
|
};
|
|
|
|
offsetof (struct rt_sigframe, uc.uc_mcontext); */
|
|
|
|
if (alpha_read_insn (gdbarch, pc - off + 4) == 0x201f015f)
|
|
return sp + 176;
|
|
|
|
/* __NR_sigreturn has the sigcontext structure at the top of the stack. */
|
|
return sp;
|
|
}
|
|
|
|
/* 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
|
|
alpha_linux_supply_gregset (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *gregs, size_t len)
|
|
{
|
|
const gdb_byte *regs = (const gdb_byte *) gregs;
|
|
|
|
gdb_assert (len >= 32 * 8);
|
|
alpha_supply_int_regs (regcache, regnum, regs, regs + 31 * 8,
|
|
len >= 33 * 8 ? regs + 32 * 8 : NULL);
|
|
}
|
|
|
|
/* Collect register REGNUM from the register cache REGCACHE and store
|
|
it in the buffer specified by GREGS and LEN as described by the
|
|
general-purpose register set REGSET. If REGNUM is -1, do this for
|
|
all registers in REGSET. */
|
|
|
|
static void
|
|
alpha_linux_collect_gregset (const struct regset *regset,
|
|
const struct regcache *regcache,
|
|
int regnum, void *gregs, size_t len)
|
|
{
|
|
gdb_byte *regs = (gdb_byte *) gregs;
|
|
|
|
gdb_assert (len >= 32 * 8);
|
|
alpha_fill_int_regs (regcache, regnum, regs, regs + 31 * 8,
|
|
len >= 33 * 8 ? regs + 32 * 8 : NULL);
|
|
}
|
|
|
|
/* 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 void
|
|
alpha_linux_supply_fpregset (const struct regset *regset,
|
|
struct regcache *regcache,
|
|
int regnum, const void *fpregs, size_t len)
|
|
{
|
|
const gdb_byte *regs = (const gdb_byte *) fpregs;
|
|
|
|
gdb_assert (len >= 32 * 8);
|
|
alpha_supply_fp_regs (regcache, regnum, regs, regs + 31 * 8);
|
|
}
|
|
|
|
/* Collect register REGNUM from the register cache REGCACHE and store
|
|
it in the buffer specified by FPREGS and LEN as described by the
|
|
general-purpose register set REGSET. If REGNUM is -1, do this for
|
|
all registers in REGSET. */
|
|
|
|
static void
|
|
alpha_linux_collect_fpregset (const struct regset *regset,
|
|
const struct regcache *regcache,
|
|
int regnum, void *fpregs, size_t len)
|
|
{
|
|
gdb_byte *regs = (gdb_byte *) fpregs;
|
|
|
|
gdb_assert (len >= 32 * 8);
|
|
alpha_fill_fp_regs (regcache, regnum, regs, regs + 31 * 8);
|
|
}
|
|
|
|
static const struct regset alpha_linux_gregset =
|
|
{
|
|
NULL,
|
|
alpha_linux_supply_gregset, alpha_linux_collect_gregset
|
|
};
|
|
|
|
static const struct regset alpha_linux_fpregset =
|
|
{
|
|
NULL,
|
|
alpha_linux_supply_fpregset, alpha_linux_collect_fpregset
|
|
};
|
|
|
|
/* Iterate over core file register note sections. */
|
|
|
|
static void
|
|
alpha_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
|
iterate_over_regset_sections_cb *cb,
|
|
void *cb_data,
|
|
const struct regcache *regcache)
|
|
{
|
|
cb (".reg", 32 * 8, &alpha_linux_gregset, NULL, cb_data);
|
|
cb (".reg2", 32 * 8, &alpha_linux_fpregset, NULL, cb_data);
|
|
}
|
|
|
|
/* Implementation of `gdbarch_gdb_signal_from_target', as defined in
|
|
gdbarch.h. */
|
|
|
|
static enum gdb_signal
|
|
alpha_linux_gdb_signal_from_target (struct gdbarch *gdbarch,
|
|
int signal)
|
|
{
|
|
switch (signal)
|
|
{
|
|
case ALPHA_LINUX_SIGEMT:
|
|
return GDB_SIGNAL_EMT;
|
|
|
|
case ALPHA_LINUX_SIGBUS:
|
|
return GDB_SIGNAL_BUS;
|
|
|
|
case ALPHA_LINUX_SIGSYS:
|
|
return GDB_SIGNAL_SYS;
|
|
|
|
case ALPHA_LINUX_SIGURG:
|
|
return GDB_SIGNAL_URG;
|
|
|
|
case ALPHA_LINUX_SIGSTOP:
|
|
return GDB_SIGNAL_STOP;
|
|
|
|
case ALPHA_LINUX_SIGTSTP:
|
|
return GDB_SIGNAL_TSTP;
|
|
|
|
case ALPHA_LINUX_SIGCONT:
|
|
return GDB_SIGNAL_CONT;
|
|
|
|
case ALPHA_LINUX_SIGCHLD:
|
|
return GDB_SIGNAL_CHLD;
|
|
|
|
/* No way to differentiate between SIGIO and SIGPOLL.
|
|
Therefore, we just handle the first one. */
|
|
case ALPHA_LINUX_SIGIO:
|
|
return GDB_SIGNAL_IO;
|
|
|
|
/* No way to differentiate between SIGINFO and SIGPWR.
|
|
Therefore, we just handle the first one. */
|
|
case ALPHA_LINUX_SIGINFO:
|
|
return GDB_SIGNAL_INFO;
|
|
|
|
case ALPHA_LINUX_SIGUSR1:
|
|
return GDB_SIGNAL_USR1;
|
|
|
|
case ALPHA_LINUX_SIGUSR2:
|
|
return GDB_SIGNAL_USR2;
|
|
}
|
|
|
|
return linux_gdb_signal_from_target (gdbarch, signal);
|
|
}
|
|
|
|
/* Implementation of `gdbarch_gdb_signal_to_target', as defined in
|
|
gdbarch.h. */
|
|
|
|
static int
|
|
alpha_linux_gdb_signal_to_target (struct gdbarch *gdbarch,
|
|
enum gdb_signal signal)
|
|
{
|
|
switch (signal)
|
|
{
|
|
case GDB_SIGNAL_EMT:
|
|
return ALPHA_LINUX_SIGEMT;
|
|
|
|
case GDB_SIGNAL_BUS:
|
|
return ALPHA_LINUX_SIGBUS;
|
|
|
|
case GDB_SIGNAL_SYS:
|
|
return ALPHA_LINUX_SIGSYS;
|
|
|
|
case GDB_SIGNAL_URG:
|
|
return ALPHA_LINUX_SIGURG;
|
|
|
|
case GDB_SIGNAL_STOP:
|
|
return ALPHA_LINUX_SIGSTOP;
|
|
|
|
case GDB_SIGNAL_TSTP:
|
|
return ALPHA_LINUX_SIGTSTP;
|
|
|
|
case GDB_SIGNAL_CONT:
|
|
return ALPHA_LINUX_SIGCONT;
|
|
|
|
case GDB_SIGNAL_CHLD:
|
|
return ALPHA_LINUX_SIGCHLD;
|
|
|
|
case GDB_SIGNAL_IO:
|
|
return ALPHA_LINUX_SIGIO;
|
|
|
|
case GDB_SIGNAL_INFO:
|
|
return ALPHA_LINUX_SIGINFO;
|
|
|
|
case GDB_SIGNAL_USR1:
|
|
return ALPHA_LINUX_SIGUSR1;
|
|
|
|
case GDB_SIGNAL_USR2:
|
|
return ALPHA_LINUX_SIGUSR2;
|
|
|
|
case GDB_SIGNAL_POLL:
|
|
return ALPHA_LINUX_SIGPOLL;
|
|
|
|
case GDB_SIGNAL_PWR:
|
|
return ALPHA_LINUX_SIGPWR;
|
|
}
|
|
|
|
return linux_gdb_signal_to_target (gdbarch, signal);
|
|
}
|
|
|
|
static void
|
|
alpha_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep;
|
|
|
|
linux_init_abi (info, 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);
|
|
|
|
tdep = gdbarch_tdep (gdbarch);
|
|
tdep->dynamic_sigtramp_offset = alpha_linux_sigtramp_offset;
|
|
tdep->sigcontext_addr = alpha_linux_sigcontext_addr;
|
|
tdep->pc_in_sigtramp = alpha_linux_pc_in_sigtramp;
|
|
tdep->jb_pc = 2;
|
|
tdep->jb_elt_size = 8;
|
|
|
|
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
|
|
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, svr4_lp64_fetch_link_map_offsets);
|
|
|
|
/* Enable TLS support. */
|
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
|
svr4_fetch_objfile_link_map);
|
|
|
|
set_gdbarch_iterate_over_regset_sections
|
|
(gdbarch, alpha_linux_iterate_over_regset_sections);
|
|
|
|
set_gdbarch_gdb_signal_from_target (gdbarch,
|
|
alpha_linux_gdb_signal_from_target);
|
|
set_gdbarch_gdb_signal_to_target (gdbarch,
|
|
alpha_linux_gdb_signal_to_target);
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
extern initialize_file_ftype _initialize_alpha_linux_tdep;
|
|
|
|
void
|
|
_initialize_alpha_linux_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_LINUX,
|
|
alpha_linux_init_abi);
|
|
}
|