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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>
281 lines
8.3 KiB
C
281 lines
8.3 KiB
C
/* Target-dependent code for NetBSD/sparc64.
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Copyright (C) 2002-2024 Free Software Foundation, Inc.
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Based on code contributed by Wasabi Systems, 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 "gdbcore.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "solib-svr4.h"
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#include "trad-frame.h"
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#include "sparc64-tdep.h"
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#include "netbsd-tdep.h"
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/* From <machine/reg.h>. */
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const struct sparc_gregmap sparc64nbsd_gregmap =
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{
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0 * 8, /* "tstate" */
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1 * 8, /* %pc */
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2 * 8, /* %npc */
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3 * 8, /* %y */
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-1, /* %fprs */
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-1,
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5 * 8, /* %g1 */
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-1, /* %l0 */
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4 /* sizeof (%y) */
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};
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static void
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sparc64nbsd_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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sparc64_supply_gregset (&sparc64nbsd_gregmap, regcache, regnum, gregs);
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}
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static void
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sparc64nbsd_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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sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
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}
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/* Signal trampolines. */
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/* The following variables describe the location of an on-stack signal
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trampoline. The current values correspond to the memory layout for
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NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and
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up, since NetBSD uses signal trampolines provided by libc now. */
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static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL;
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static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL;
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static int
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sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
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{
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if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end)
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return 1;
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return nbsd_pc_in_sigtramp (pc, name);
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}
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trad_frame_saved_reg *
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sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr,
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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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trad_frame_saved_reg *saved_regs;
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CORE_ADDR addr, sp;
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int regnum, delta;
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saved_regs = trad_frame_alloc_saved_regs (this_frame);
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/* The registers are saved in bits and pieces scattered all over the
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place. The code below records their location on the assumption
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that the part of the signal trampoline that saves the state has
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been executed. */
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saved_regs[SPARC_SP_REGNUM].set_addr (sigcontext_addr + 8);
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saved_regs[SPARC64_PC_REGNUM].set_addr (sigcontext_addr + 16);
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saved_regs[SPARC64_NPC_REGNUM].set_addr (sigcontext_addr + 24);
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saved_regs[SPARC64_STATE_REGNUM].set_addr (sigcontext_addr + 32);
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saved_regs[SPARC_G1_REGNUM].set_addr (sigcontext_addr + 40);
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saved_regs[SPARC_O0_REGNUM].set_addr (sigcontext_addr + 48);
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/* The remaining `global' registers and %y are saved in the `local'
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registers. */
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delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
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for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
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saved_regs[regnum].set_realreg (regnum + delta);
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saved_regs[SPARC64_Y_REGNUM].set_realreg (SPARC_L1_REGNUM);
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/* The remaining `out' registers can be found in the current frame's
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`in' registers. */
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delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
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for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
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saved_regs[regnum].set_realreg (regnum + delta);
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saved_regs[SPARC_O7_REGNUM].set_realreg (SPARC_I7_REGNUM);
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/* The `local' and `in' registers have been saved in the register
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save area. */
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addr = 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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saved_regs[regnum].set_addr (addr);
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/* Handle StackGhost. */
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{
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ULONGEST wcookie = sparc_fetch_wcookie (gdbarch);
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if (wcookie != 0)
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{
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ULONGEST i7;
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addr = saved_regs[SPARC_I7_REGNUM].addr ();
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i7 = get_frame_memory_unsigned (this_frame, addr, 8);
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saved_regs[SPARC_I7_REGNUM].set_value (i7 ^ wcookie);
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}
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}
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/* TODO: Handle the floating-point registers. */
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return saved_regs;
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}
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static struct sparc_frame_cache *
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sparc64nbsd_sigcontext_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 addr;
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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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/* If we couldn't find the frame's function, we're probably dealing
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with an on-stack signal trampoline. */
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if (cache->pc == 0)
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{
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cache->pc = sparc64nbsd_sigtramp_start;
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/* Since we couldn't find the frame's function, the cache was
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initialized under the assumption that we're frameless. */
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sparc_record_save_insn (cache);
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addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM);
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if (addr & 1)
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addr += BIAS;
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cache->base = addr;
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}
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/* We find the appropriate instance of `struct sigcontext' at a
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fixed offset in the signal frame. */
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addr = cache->base + 128 + 8;
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cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame);
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return cache;
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}
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static void
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sparc64nbsd_sigcontext_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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sparc64nbsd_sigcontext_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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sparc64nbsd_sigcontext_frame_prev_register (const frame_info_ptr &this_frame,
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void **this_cache, int regnum)
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{
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struct sparc_frame_cache *cache =
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sparc64nbsd_sigcontext_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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sparc64nbsd_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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CORE_ADDR pc = get_frame_pc (this_frame);
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const char *name;
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (sparc64nbsd_pc_in_sigtramp (pc, name))
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{
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if (name == NULL || !startswith (name, "__sigtramp_sigcontext"))
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return 1;
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}
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return 0;
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}
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static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind =
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{
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"sparc64 netbsd sigcontext",
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SIGTRAMP_FRAME,
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default_frame_unwind_stop_reason,
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sparc64nbsd_sigcontext_frame_this_id,
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sparc64nbsd_sigcontext_frame_prev_register,
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NULL,
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sparc64nbsd_sigtramp_frame_sniffer
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};
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static const struct regset sparc64nbsd_gregset =
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{
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NULL, sparc64nbsd_supply_gregset, NULL
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};
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static const struct regset sparc64nbsd_fpregset =
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{
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NULL, sparc64nbsd_supply_fpregset, NULL
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};
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static void
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sparc64nbsd_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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nbsd_init_abi (info, gdbarch);
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tdep->gregset = &sparc64nbsd_gregset;
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tdep->sizeof_gregset = 160;
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tdep->fpregset = &sparc64nbsd_fpregset;
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tdep->sizeof_fpregset = 272;
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/* Make sure we can single-step "new" syscalls. */
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tdep->step_trap = sparcnbsd_step_trap;
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frame_unwind_append_unwinder (gdbarch, &sparc64nbsd_sigcontext_frame_unwind);
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sparc64_init_abi (info, gdbarch);
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/* NetBSD/sparc64 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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}
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void _initialize_sparc64nbsd_tdep ();
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void
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_initialize_sparc64nbsd_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_NETBSD, sparc64nbsd_init_abi);
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}
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