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8480a37e14
We currently pass frames to function by value, as `frame_info_ptr`.
This is somewhat expensive:
- the size of `frame_info_ptr` is 64 bytes, which is a bit big to pass
by value
- the constructors and destructor link/unlink the object in the global
`frame_info_ptr::frame_list` list. This is an `intrusive_list`, so
it's not so bad: it's just assigning a few points, there's no memory
allocation as if it was `std::list`, but still it's useless to do
that over and over.
As suggested by Tom Tromey, change many function signatures to accept
`const frame_info_ptr &` instead of `frame_info_ptr`.
Some functions reassign their `frame_info_ptr` parameter, like:
void
the_func (frame_info_ptr frame)
{
for (; frame != nullptr; frame = get_prev_frame (frame))
{
...
}
}
I wondered what to do about them, do I leave them as-is or change them
(and need to introduce a separate local variable that can be
re-assigned). I opted for the later for consistency. It might not be
clear why some functions take `const frame_info_ptr &` while others take
`frame_info_ptr`. Also, if a function took a `frame_info_ptr` because
it did re-assign its parameter, I doubt that we would think to change it
to `const frame_info_ptr &` should the implementation change such that
it doesn't need to take `frame_info_ptr` anymore. It seems better to
have a simple rule and apply it everywhere.
Change-Id: I59d10addef687d157f82ccf4d54f5dde9a963fd0
Approved-By: Andrew Burgess <aburgess@redhat.com>
397 lines
11 KiB
C
397 lines
11 KiB
C
/* Target-dependent code for GNU/Linux on Alpha.
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Copyright (C) 2002-2024 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "frame.h"
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#include "osabi.h"
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#include "solib-svr4.h"
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#include "symtab.h"
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#include "regset.h"
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#include "regcache.h"
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#include "linux-tdep.h"
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#include "alpha-tdep.h"
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#include "gdbarch.h"
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/* This enum represents the signals' numbers on the Alpha
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architecture. It just contains the signal definitions which are
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different from the generic implementation.
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It is derived from the file <arch/alpha/include/uapi/asm/signal.h>,
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from the Linux kernel tree. */
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enum
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{
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/* SIGABRT is the same as in the generic implementation, but is
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defined here because SIGIOT depends on it. */
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ALPHA_LINUX_SIGABRT = 6,
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ALPHA_LINUX_SIGEMT = 7,
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ALPHA_LINUX_SIGBUS = 10,
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ALPHA_LINUX_SIGSYS = 12,
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ALPHA_LINUX_SIGURG = 16,
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ALPHA_LINUX_SIGSTOP = 17,
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ALPHA_LINUX_SIGTSTP = 18,
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ALPHA_LINUX_SIGCONT = 19,
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ALPHA_LINUX_SIGCHLD = 20,
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ALPHA_LINUX_SIGIO = 23,
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ALPHA_LINUX_SIGINFO = 29,
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ALPHA_LINUX_SIGUSR1 = 30,
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ALPHA_LINUX_SIGUSR2 = 31,
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ALPHA_LINUX_SIGPOLL = ALPHA_LINUX_SIGIO,
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ALPHA_LINUX_SIGPWR = ALPHA_LINUX_SIGINFO,
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ALPHA_LINUX_SIGIOT = ALPHA_LINUX_SIGABRT,
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};
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/* Under GNU/Linux, signal handler invocations can be identified by
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the designated code sequence that is used to return from a signal
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handler. In particular, the return address of a signal handler
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points to a sequence that copies $sp to $16, loads $0 with the
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appropriate syscall number, and finally enters the kernel.
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This is somewhat complicated in that:
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(1) the expansion of the "mov" assembler macro has changed over
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time, from "bis src,src,dst" to "bis zero,src,dst",
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(2) the kernel has changed from using "addq" to "lda" to load the
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syscall number,
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(3) there is a "normal" sigreturn and an "rt" sigreturn which
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has a different stack layout. */
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static long
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alpha_linux_sigtramp_offset_1 (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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switch (alpha_read_insn (gdbarch, pc))
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{
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case 0x47de0410: /* bis $30,$30,$16 */
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case 0x47fe0410: /* bis $31,$30,$16 */
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return 0;
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case 0x43ecf400: /* addq $31,103,$0 */
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case 0x201f0067: /* lda $0,103($31) */
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case 0x201f015f: /* lda $0,351($31) */
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return 4;
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case 0x00000083: /* call_pal callsys */
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return 8;
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default:
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return -1;
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}
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}
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static LONGEST
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alpha_linux_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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long i, off;
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if (pc & 3)
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return -1;
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/* Guess where we might be in the sequence. */
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off = alpha_linux_sigtramp_offset_1 (gdbarch, pc);
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if (off < 0)
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return -1;
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/* Verify that the other two insns of the sequence are as we expect. */
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pc -= off;
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for (i = 0; i < 12; i += 4)
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{
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if (i == off)
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continue;
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if (alpha_linux_sigtramp_offset_1 (gdbarch, pc + i) != i)
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return -1;
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}
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return off;
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}
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static int
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alpha_linux_pc_in_sigtramp (struct gdbarch *gdbarch,
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CORE_ADDR pc, const char *func_name)
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{
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return alpha_linux_sigtramp_offset (gdbarch, pc) >= 0;
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}
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static CORE_ADDR
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alpha_linux_sigcontext_addr (const frame_info_ptr &this_frame)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR pc;
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ULONGEST sp;
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long off;
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pc = get_frame_pc (this_frame);
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sp = get_frame_register_unsigned (this_frame, ALPHA_SP_REGNUM);
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off = alpha_linux_sigtramp_offset (gdbarch, pc);
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gdb_assert (off >= 0);
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/* __NR_rt_sigreturn has a couple of structures on the stack. This is:
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struct rt_sigframe {
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struct siginfo info;
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struct ucontext uc;
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};
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offsetof (struct rt_sigframe, uc.uc_mcontext); */
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if (alpha_read_insn (gdbarch, pc - off + 4) == 0x201f015f)
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return sp + 176;
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/* __NR_sigreturn has the sigcontext structure at the top of the stack. */
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return sp;
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alpha_linux_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const gdb_byte *regs = (const gdb_byte *) gregs;
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gdb_assert (len >= 32 * 8);
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alpha_supply_int_regs (regcache, regnum, regs, regs + 31 * 8,
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len >= 33 * 8 ? regs + 32 * 8 : NULL);
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}
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/* Collect register REGNUM from the register cache REGCACHE and store
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it in the buffer specified by GREGS and LEN as described by the
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general-purpose register set REGSET. If REGNUM is -1, do this for
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all registers in REGSET. */
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static void
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alpha_linux_collect_gregset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *gregs, size_t len)
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{
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gdb_byte *regs = (gdb_byte *) gregs;
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gdb_assert (len >= 32 * 8);
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alpha_fill_int_regs (regcache, regnum, regs, regs + 31 * 8,
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len >= 33 * 8 ? regs + 32 * 8 : NULL);
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}
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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in the floating-point register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alpha_linux_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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const gdb_byte *regs = (const gdb_byte *) fpregs;
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gdb_assert (len >= 32 * 8);
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alpha_supply_fp_regs (regcache, regnum, regs, regs + 31 * 8);
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}
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/* Collect register REGNUM from the register cache REGCACHE and store
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it in the buffer specified by FPREGS and LEN as described by the
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general-purpose register set REGSET. If REGNUM is -1, do this for
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all registers in REGSET. */
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static void
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alpha_linux_collect_fpregset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *fpregs, size_t len)
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{
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gdb_byte *regs = (gdb_byte *) fpregs;
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gdb_assert (len >= 32 * 8);
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alpha_fill_fp_regs (regcache, regnum, regs, regs + 31 * 8);
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}
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static const struct regset alpha_linux_gregset =
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{
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NULL,
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alpha_linux_supply_gregset, alpha_linux_collect_gregset
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};
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static const struct regset alpha_linux_fpregset =
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{
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NULL,
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alpha_linux_supply_fpregset, alpha_linux_collect_fpregset
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};
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/* Iterate over core file register note sections. */
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static void
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alpha_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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cb (".reg", 32 * 8, 32 * 8, &alpha_linux_gregset, NULL, cb_data);
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cb (".reg2", 32 * 8, 32 * 8, &alpha_linux_fpregset, NULL, cb_data);
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}
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/* Implementation of `gdbarch_gdb_signal_from_target', as defined in
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gdbarch.h. */
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static enum gdb_signal
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alpha_linux_gdb_signal_from_target (struct gdbarch *gdbarch,
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int signal)
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{
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switch (signal)
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{
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case ALPHA_LINUX_SIGEMT:
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return GDB_SIGNAL_EMT;
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case ALPHA_LINUX_SIGBUS:
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return GDB_SIGNAL_BUS;
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case ALPHA_LINUX_SIGSYS:
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return GDB_SIGNAL_SYS;
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case ALPHA_LINUX_SIGURG:
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return GDB_SIGNAL_URG;
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case ALPHA_LINUX_SIGSTOP:
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return GDB_SIGNAL_STOP;
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case ALPHA_LINUX_SIGTSTP:
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return GDB_SIGNAL_TSTP;
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case ALPHA_LINUX_SIGCONT:
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return GDB_SIGNAL_CONT;
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case ALPHA_LINUX_SIGCHLD:
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return GDB_SIGNAL_CHLD;
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/* No way to differentiate between SIGIO and SIGPOLL.
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Therefore, we just handle the first one. */
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case ALPHA_LINUX_SIGIO:
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return GDB_SIGNAL_IO;
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/* No way to differentiate between SIGINFO and SIGPWR.
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Therefore, we just handle the first one. */
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case ALPHA_LINUX_SIGINFO:
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return GDB_SIGNAL_INFO;
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case ALPHA_LINUX_SIGUSR1:
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return GDB_SIGNAL_USR1;
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case ALPHA_LINUX_SIGUSR2:
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return GDB_SIGNAL_USR2;
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}
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return linux_gdb_signal_from_target (gdbarch, signal);
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}
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/* Implementation of `gdbarch_gdb_signal_to_target', as defined in
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gdbarch.h. */
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static int
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alpha_linux_gdb_signal_to_target (struct gdbarch *gdbarch,
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enum gdb_signal signal)
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{
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switch (signal)
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{
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case GDB_SIGNAL_EMT:
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return ALPHA_LINUX_SIGEMT;
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case GDB_SIGNAL_BUS:
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return ALPHA_LINUX_SIGBUS;
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case GDB_SIGNAL_SYS:
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return ALPHA_LINUX_SIGSYS;
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case GDB_SIGNAL_URG:
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return ALPHA_LINUX_SIGURG;
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case GDB_SIGNAL_STOP:
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return ALPHA_LINUX_SIGSTOP;
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case GDB_SIGNAL_TSTP:
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return ALPHA_LINUX_SIGTSTP;
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case GDB_SIGNAL_CONT:
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return ALPHA_LINUX_SIGCONT;
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case GDB_SIGNAL_CHLD:
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return ALPHA_LINUX_SIGCHLD;
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case GDB_SIGNAL_IO:
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return ALPHA_LINUX_SIGIO;
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case GDB_SIGNAL_INFO:
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return ALPHA_LINUX_SIGINFO;
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case GDB_SIGNAL_USR1:
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return ALPHA_LINUX_SIGUSR1;
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case GDB_SIGNAL_USR2:
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return ALPHA_LINUX_SIGUSR2;
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case GDB_SIGNAL_POLL:
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return ALPHA_LINUX_SIGPOLL;
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case GDB_SIGNAL_PWR:
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return ALPHA_LINUX_SIGPWR;
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}
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return linux_gdb_signal_to_target (gdbarch, signal);
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}
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static void
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alpha_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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linux_init_abi (info, gdbarch, 0);
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/* Hook into the DWARF CFI frame unwinder. */
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alpha_dwarf2_init_abi (info, gdbarch);
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/* Hook into the MDEBUG frame unwinder. */
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alpha_mdebug_init_abi (info, gdbarch);
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alpha_gdbarch_tdep *tdep = gdbarch_tdep<alpha_gdbarch_tdep> (gdbarch);
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tdep->dynamic_sigtramp_offset = alpha_linux_sigtramp_offset;
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tdep->sigcontext_addr = alpha_linux_sigcontext_addr;
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tdep->pc_in_sigtramp = alpha_linux_pc_in_sigtramp;
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tdep->jb_pc = 2;
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tdep->jb_elt_size = 8;
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, linux_lp64_fetch_link_map_offsets);
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/* Enable TLS support. */
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, alpha_linux_iterate_over_regset_sections);
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set_gdbarch_gdb_signal_from_target (gdbarch,
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alpha_linux_gdb_signal_from_target);
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set_gdbarch_gdb_signal_to_target (gdbarch,
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alpha_linux_gdb_signal_to_target);
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}
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void _initialize_alpha_linux_tdep ();
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void
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_initialize_alpha_linux_tdep ()
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{
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_LINUX,
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alpha_linux_init_abi);
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}
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