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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>
141 lines
4.3 KiB
C++
141 lines
4.3 KiB
C++
/* Target-dependent code for 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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#ifndef SPARC64_TDEP_H
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#define SPARC64_TDEP_H 1
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class frame_info_ptr;
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struct gdbarch;
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struct regcache;
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struct sparc_gregmap;
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struct trad_frame_saved_reg;
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#include "sparc-tdep.h"
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/* The stack pointer is offset from the stack frame by a BIAS of 2047
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(0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
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hosts, so undefine it first. */
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#undef BIAS
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#define BIAS 2047
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/* Register offsets for the general-purpose register set. */
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/* UltraSPARC doesn't have %psr. */
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#define r_tstate_offset r_psr_offset
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/* UltraSPARC doesn't have %wim either. */
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#define r_fprs_offset r_wim_offset
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/* Register numbers of various important registers. */
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enum sparc64_regnum
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{
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SPARC64_F32_REGNUM /* %f32 */
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= SPARC_F0_REGNUM + 32,
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SPARC64_F62_REGNUM /* %f62 */
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= SPARC64_F32_REGNUM + 15,
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SPARC64_PC_REGNUM, /* %pc */
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SPARC64_NPC_REGNUM, /* %npc */
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SPARC64_STATE_REGNUM,
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SPARC64_FSR_REGNUM, /* %fsr */
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SPARC64_FPRS_REGNUM, /* %fprs */
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SPARC64_Y_REGNUM, /* %y */
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};
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/* Pseudo registers. */
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enum sparc64_pseudo_regnum
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{
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SPARC64_CWP_REGNUM = 0, /* %cwp */
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SPARC64_PSTATE_REGNUM, /* %pstate */
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SPARC64_ASI_REGNUM, /* %asi */
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SPARC64_CCR_REGNUM, /* %ccr */
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SPARC64_D0_REGNUM, /* %d0 */
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SPARC64_D10_REGNUM /* %d10 */
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= SPARC64_D0_REGNUM + 5,
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SPARC64_D30_REGNUM /* %d30 */
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= SPARC64_D0_REGNUM + 15,
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SPARC64_D32_REGNUM /* %d32 */
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= SPARC64_D0_REGNUM + 16,
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SPARC64_D62_REGNUM /* %d62 */
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= SPARC64_D0_REGNUM + 31,
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SPARC64_Q0_REGNUM, /* %q0 */
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SPARC64_Q8_REGNUM /* %q8 */
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= SPARC64_Q0_REGNUM + 2,
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SPARC64_Q28_REGNUM /* %q28 */
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= SPARC64_Q0_REGNUM + 7,
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SPARC64_Q32_REGNUM /* %q32 */
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= SPARC64_Q0_REGNUM + 8,
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SPARC64_Q60_REGNUM /* %q60 */
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= SPARC64_Q0_REGNUM + 15
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};
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/* Processor state bits. */
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#define SPARC64_PSTATE_AG 0x001
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#define SPARC64_PSTATE_IE 0x002
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#define SPARC64_PSTATE_PRIV 0x004
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#define SPARC64_PSTATE_AM 0x008
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#define SPARC64_PSTATE_PEF 0x010
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#define SPARC64_PSTATE_RED 0x020
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#define SPARC64_PSTATE_TLE 0x100
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#define SPARC64_PSTATE_CLE 0x200
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#define SPARC64_PSTATE_PID0 0x400
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#define SPARC64_PSTATE_PID1 0x800
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extern void sparc64_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch);
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extern void sparc64_supply_gregset (const struct sparc_gregmap *gregmap,
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struct regcache *regcache,
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int regnum, const void *gregs);
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extern void sparc64_collect_gregset (const struct sparc_gregmap *gregmap,
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const struct regcache *regcache,
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int regnum, void *gregs);
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extern void sparc64_supply_fpregset (const struct sparc_fpregmap *fpregmap,
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struct regcache *regcache,
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int regnum, const void *fpregs);
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extern void sparc64_collect_fpregset (const struct sparc_fpregmap *fpregmap,
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const struct regcache *regcache,
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int regnum, void *fpregs);
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/* Functions and variables exported from sparc64-sol2-tdep.c. */
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/* Register offsets for Solaris 2. */
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extern const struct sparc_gregmap sparc64_sol2_gregmap;
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extern const struct sparc_fpregmap sparc64_sol2_fpregmap;
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/* Variables exported from sparc64-fbsd-tdep.c. */
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/* Register offsets for FreeBSD/sparc64. */
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extern const struct sparc_gregmap sparc64fbsd_gregmap;
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/* Functions and variables exported from sparc64-netbsd-tdep.c. */
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/* Register offsets for NetBSD/sparc64. */
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extern const struct sparc_gregmap sparc64nbsd_gregmap;
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extern struct trad_frame_saved_reg *
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sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr,
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const frame_info_ptr &next_frame);
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extern const struct sparc_fpregmap sparc64_bsd_fpregmap;
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extern void sparc64_forget_process (pid_t pid);
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#endif /* sparc64-tdep.h */
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