X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Falpha-linux-tdep.c;h=913a42040184649229b41da4986056786c021287;hb=2a90824133f9d46970c9c52b68ef2ccbeb6389ac;hp=f9b060dc9601c494a8556064fedfe79b1891a5d0;hpb=36a6271d5e87dca85b032036e2a3a0209ebf73cc;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/alpha-linux-tdep.c b/gdb/alpha-linux-tdep.c
index f9b060dc96..913a420401 100644
--- a/gdb/alpha-linux-tdep.c
+++ b/gdb/alpha-linux-tdep.c
@@ -1,11 +1,11 @@
/* Target-dependent code for GNU/Linux on Alpha.
- Copyright 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002-2018 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 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,
@@ -14,88 +14,383 @@
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 . */
#include "defs.h"
-#include "gdbcore.h"
-#include "value.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"
-/* Under GNU/Linux, signal handler invocations can be identified by the
- designated code sequence that is used to return from a signal
+/* 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 ,
+ 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 the following sequence (the first instruction is quadword
- aligned):
-
- bis $30,$30,$16
- addq $31,0x67,$0
- call_pal callsys
-
- Each instruction has a unique encoding, so we simply attempt to
- match the instruction the pc is pointing to with any of the above
- instructions. If there is a hit, we know the offset to the start
- of the designated sequence and can then check whether we really are
- executing in a designated sequence. If not, -1 is returned,
- otherwise the offset from the start of the desingated sequence is
- returned.
-
- There is a slight chance of false hits: code could jump into the
- middle of the designated sequence, in which case there is no
- guarantee that we are in the middle of a sigreturn syscall. Don't
- think this will be a problem in praxis, though. */
-LONGEST
-alpha_linux_sigtramp_offset (CORE_ADDR pc)
-{
- unsigned int i[3], w;
- long off;
+ points to a sequence that copies $sp to $16, loads $0 with the
+ appropriate syscall number, and finally enters the kernel.
- if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
- return -1;
+ 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. */
- off = -1;
- switch (w)
+static long
+alpha_linux_sigtramp_offset_1 (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ switch (alpha_read_insn (gdbarch, pc))
{
- case 0x47de0410:
- off = 0;
- break; /* bis $30,$30,$16 */
- case 0x43ecf400:
- off = 4;
- break; /* addq $31,0x67,$0 */
- case 0x00000083:
- off = 8;
- break; /* call_pal callsys */
+ 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;
- if (pc & 0x7)
+ for (i = 0; i < 12; i += 4)
{
- /* designated sequence is not quadword aligned */
- return -1;
+ if (i == off)
+ continue;
+ if (alpha_linux_sigtramp_offset_1 (gdbarch, pc + i) != i)
+ return -1;
}
- if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
- return -1;
- if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
- return off;
+ return off;
+}
- return -1;
+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_init_abi (struct gdbarch_info info,
- struct gdbarch *gdbarch)
+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 =
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ 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, 32 * 8, &alpha_linux_gregset, NULL, cb_data);
+ cb (".reg2", 32 * 8, 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);
}
void
_initialize_alpha_linux_tdep (void)
{
- alpha_gdbarch_register_os_abi (ALPHA_ABI_LINUX, alpha_linux_init_abi);
+ gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_LINUX,
+ alpha_linux_init_abi);
}