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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>
236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/* Target-dependent code for Solaris UltraSPARC.
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Copyright (C) 2003-2024 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 "frame-unwind.h"
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#include "gdbarch.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "osabi.h"
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#include "trad-frame.h"
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#include "regset.h"
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#include "sol2-tdep.h"
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#include "sparc64-tdep.h"
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#include "solib-svr4.h"
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/* From <sys/regset.h>. */
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const struct sparc_gregmap sparc64_sol2_gregmap =
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{
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32 * 8, /* "tstate" */
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33 * 8, /* %pc */
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34 * 8, /* %npc */
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35 * 8, /* %y */
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-1, /* %wim */
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-1, /* %tbr */
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1 * 8, /* %g1 */
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16 * 8, /* %l0 */
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8 /* sizeof (%y) */
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};
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const struct sparc_fpregmap sparc64_sol2_fpregmap =
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{
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0 * 8, /* %f0 */
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33 * 8, /* %fsr */
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};
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static void
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sparc64_sol2_supply_core_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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sparc64_supply_gregset (&sparc64_sol2_gregmap, regcache, regnum, gregs);
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}
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static void
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sparc64_sol2_collect_core_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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sparc64_collect_gregset (&sparc64_sol2_gregmap, regcache, regnum, gregs);
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}
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static void
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sparc64_sol2_supply_core_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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sparc64_supply_fpregset (&sparc64_sol2_fpregmap, regcache, regnum, fpregs);
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}
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static void
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sparc64_sol2_collect_core_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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sparc64_collect_fpregset (&sparc64_sol2_fpregmap, regcache, regnum, fpregs);
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}
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static const struct regset sparc64_sol2_gregset =
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{
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NULL,
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sparc64_sol2_supply_core_gregset,
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sparc64_sol2_collect_core_gregset
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};
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static const struct regset sparc64_sol2_fpregset =
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{
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NULL,
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sparc64_sol2_supply_core_fpregset,
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sparc64_sol2_collect_core_fpregset
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};
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static struct sparc_frame_cache *
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sparc64_sol2_sigtramp_frame_cache (const frame_info_ptr &this_frame,
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void **this_cache)
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{
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struct sparc_frame_cache *cache;
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CORE_ADDR mcontext_addr, addr;
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int regnum;
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if (*this_cache)
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return (struct sparc_frame_cache *) *this_cache;
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cache = sparc_frame_cache (this_frame, this_cache);
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gdb_assert (cache == *this_cache);
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cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
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/* The third argument is a pointer to an instance of `ucontext_t',
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which has a member `uc_mcontext' that contains the saved
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registers. */
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regnum =
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(cache->copied_regs_mask & 0x04) ? SPARC_I2_REGNUM : SPARC_O2_REGNUM;
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mcontext_addr = get_frame_register_unsigned (this_frame, regnum) + 64;
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cache->saved_regs[SPARC64_CCR_REGNUM].set_addr (mcontext_addr + 0 * 8);
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cache->saved_regs[SPARC64_PC_REGNUM].set_addr (mcontext_addr + 1 * 8);
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cache->saved_regs[SPARC64_NPC_REGNUM].set_addr (mcontext_addr + 2 * 8);
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cache->saved_regs[SPARC64_Y_REGNUM].set_addr (mcontext_addr + 3 * 8);
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cache->saved_regs[SPARC64_ASI_REGNUM].set_addr (mcontext_addr + 19 * 8);
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cache->saved_regs[SPARC64_FPRS_REGNUM].set_addr (mcontext_addr + 20 * 8);
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/* Since %g0 is always zero, keep the identity encoding. */
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for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 8;
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regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
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cache->saved_regs[regnum].set_addr (addr);
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if (get_frame_memory_unsigned (this_frame, mcontext_addr + 21 * 8, 8))
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{
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/* The register windows haven't been flushed. */
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for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
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cache->saved_regs[regnum].set_unknown ();
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}
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else
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{
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CORE_ADDR sp;
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addr = cache->saved_regs[SPARC_SP_REGNUM].addr ();
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sp = get_frame_memory_unsigned (this_frame, addr, 8);
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for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
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regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
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cache->saved_regs[regnum].set_addr (addr);
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}
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return cache;
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}
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static void
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sparc64_sol2_sigtramp_frame_this_id (const frame_info_ptr &this_frame,
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void **this_cache,
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struct frame_id *this_id)
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{
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struct sparc_frame_cache *cache =
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sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
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(*this_id) = frame_id_build (cache->base, cache->pc);
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}
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static struct value *
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sparc64_sol2_sigtramp_frame_prev_register (const frame_info_ptr &this_frame,
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void **this_cache,
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int regnum)
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{
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struct sparc_frame_cache *cache =
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sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
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return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
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}
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static int
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sparc64_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self,
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const frame_info_ptr &this_frame,
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void **this_cache)
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{
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return sol2_sigtramp_p (this_frame);
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}
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static const struct frame_unwind sparc64_sol2_sigtramp_frame_unwind =
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{
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"sparc64 solaris sigtramp",
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SIGTRAMP_FRAME,
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default_frame_unwind_stop_reason,
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sparc64_sol2_sigtramp_frame_this_id,
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sparc64_sol2_sigtramp_frame_prev_register,
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NULL,
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sparc64_sol2_sigtramp_frame_sniffer
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};
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static void
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sparc64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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sparc_gdbarch_tdep *tdep = gdbarch_tdep<sparc_gdbarch_tdep> (gdbarch);
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tdep->gregset = &sparc64_sol2_gregset;
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tdep->sizeof_gregset = 304;
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tdep->fpregset = &sparc64_sol2_fpregset;
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tdep->sizeof_fpregset = 544;
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frame_unwind_append_unwinder (gdbarch, &sparc64_sol2_sigtramp_frame_unwind);
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sparc64_init_abi (info, gdbarch);
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sol2_init_abi (info, gdbarch);
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/* Solaris has SVR4-style shared libraries... */
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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, svr4_lp64_fetch_link_map_offsets);
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/* ...which means that we need some special handling when doing
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prologue analysis. */
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tdep->plt_entry_size = 16;
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/* Solaris has kernel-assisted single-stepping support. */
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set_gdbarch_software_single_step (gdbarch, NULL);
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}
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void _initialize_sparc64_sol2_tdep ();
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void
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_initialize_sparc64_sol2_tdep ()
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{
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gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
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GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
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}
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