mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-21 01:12:32 +08:00
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>
181 lines
5.2 KiB
C
181 lines
5.2 KiB
C
/* Target-dependent code for GNU/Linux on OpenRISC processors.
|
|
Copyright (C) 2018-2024 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 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
#include "or1k-tdep.h"
|
|
#include "osabi.h"
|
|
#include "glibc-tdep.h"
|
|
#include "linux-tdep.h"
|
|
#include "solib-svr4.h"
|
|
#include "regset.h"
|
|
#include "tramp-frame.h"
|
|
#include "trad-frame.h"
|
|
#include "gdbarch.h"
|
|
|
|
#include "features/or1k-linux.c"
|
|
|
|
/* Define the general register mapping. The kernel and GDB put registers
|
|
r1 to r31 in the same place. The NPC register is stored at index 32 in
|
|
linux and 33 in GDB, in GDB 32 is for PPC which is not populated from linux.
|
|
Register r0 is always 0 and can be ignored. */
|
|
|
|
static const struct regcache_map_entry or1k_linux_gregmap[] =
|
|
{
|
|
{ 32, OR1K_ZERO_REGNUM, 4 }, /* r0 to r31 */
|
|
{ 1, OR1K_NPC_REGNUM, 4 },
|
|
{ 0 }
|
|
};
|
|
|
|
/* Define the general register regset. */
|
|
|
|
static const struct regset or1k_linux_gregset =
|
|
{
|
|
or1k_linux_gregmap, regcache_supply_regset, regcache_collect_regset
|
|
};
|
|
|
|
/* Define hook for core file support. */
|
|
|
|
static void
|
|
or1k_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
|
iterate_over_regset_sections_cb *cb,
|
|
void *cb_data,
|
|
const struct regcache *regcache)
|
|
{
|
|
cb (".reg", (33 * 4), (33 * 4), &or1k_linux_gregset, NULL, cb_data);
|
|
}
|
|
|
|
/* Signal trampoline support. */
|
|
|
|
static void or1k_linux_sigframe_init (const struct tramp_frame *self,
|
|
const frame_info_ptr &this_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func);
|
|
|
|
#define OR1K_RT_SIGRETURN 139
|
|
|
|
#define OR1K_INST_L_ORI_R11_R0_IMM 0xa9600000
|
|
#define OR1K_INST_L_SYS_1 0x20000001
|
|
#define OR1K_INST_L_NOP 0x15000000
|
|
|
|
static const struct tramp_frame or1k_linux_sigframe = {
|
|
SIGTRAMP_FRAME,
|
|
4,
|
|
{
|
|
{ OR1K_INST_L_ORI_R11_R0_IMM | OR1K_RT_SIGRETURN, ULONGEST_MAX },
|
|
{ OR1K_INST_L_SYS_1, ULONGEST_MAX },
|
|
{ OR1K_INST_L_NOP, ULONGEST_MAX },
|
|
{ TRAMP_SENTINEL_INSN }
|
|
},
|
|
or1k_linux_sigframe_init,
|
|
NULL
|
|
};
|
|
|
|
/* Runtime signal frames look like this:
|
|
struct rt_sigframe {
|
|
struct siginfo info;
|
|
struct ucontext uc;
|
|
unsigned char retcode[16];
|
|
};
|
|
|
|
struct ucontext {
|
|
unsigned long uc_flags; - 4
|
|
struct ucontext *uc_link; - 4
|
|
stack_t uc_stack; - 4 * 3
|
|
struct sigcontext uc_mcontext;
|
|
sigset_t uc_sigmask;
|
|
};
|
|
|
|
struct sigcontext {
|
|
struct user_regs_struct regs;
|
|
unsigned long oldmask;
|
|
};
|
|
|
|
struct user_regs_struct {
|
|
unsigned long gpr[32];
|
|
unsigned long pc;
|
|
unsigned long sr;
|
|
}; */
|
|
|
|
#define SIGFRAME_SIGINFO_SIZE 128
|
|
#define UCONTEXT_MCONTEXT_OFFSET 20
|
|
|
|
static void
|
|
or1k_linux_sigframe_init (const struct tramp_frame *self,
|
|
const frame_info_ptr &this_frame,
|
|
struct trad_frame_cache *this_cache,
|
|
CORE_ADDR func)
|
|
{
|
|
CORE_ADDR frame_sp = get_frame_sp (this_frame);
|
|
CORE_ADDR mcontext_base;
|
|
CORE_ADDR regs_base;
|
|
|
|
mcontext_base = frame_sp + SIGFRAME_SIGINFO_SIZE + UCONTEXT_MCONTEXT_OFFSET;
|
|
|
|
/* Handle the general registers 0-31 followed by the PC. */
|
|
regs_base = mcontext_base;
|
|
for (int i = 0; i < 32; i++)
|
|
trad_frame_set_reg_addr (this_cache, OR1K_ZERO_REGNUM + i,
|
|
regs_base + (i * 4));
|
|
trad_frame_set_reg_addr (this_cache, OR1K_NPC_REGNUM, regs_base + (32 * 4));
|
|
trad_frame_set_reg_addr (this_cache, OR1K_SR_REGNUM, regs_base + (33 * 4));
|
|
|
|
/* Choice of the bottom of the sigframe is somewhat arbitrary. */
|
|
trad_frame_set_id (this_cache, frame_id_build (frame_sp, func));
|
|
}
|
|
|
|
/* Initialize OpenRISC Linux ABI info. */
|
|
|
|
static void
|
|
or1k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
linux_init_abi (info, gdbarch, 0);
|
|
|
|
set_solib_svr4_fetch_link_map_offsets (gdbarch,
|
|
linux_ilp32_fetch_link_map_offsets);
|
|
|
|
/* GNU/Linux uses SVR4-style shared libraries. */
|
|
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
|
|
|
|
/* GNU/Linux uses the dynamic linker included in the GNU C Library. */
|
|
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
|
|
|
|
set_gdbarch_software_single_step (gdbarch, or1k_software_single_step);
|
|
|
|
/* Enable TLS support. */
|
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
|
svr4_fetch_objfile_link_map);
|
|
|
|
set_gdbarch_iterate_over_regset_sections
|
|
(gdbarch, or1k_linux_iterate_over_regset_sections);
|
|
|
|
tramp_frame_prepend_unwinder (gdbarch, &or1k_linux_sigframe);
|
|
}
|
|
|
|
/* Initialize OpenRISC Linux target support. */
|
|
|
|
void _initialize_or1k_linux_tdep ();
|
|
void
|
|
_initialize_or1k_linux_tdep ()
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_or1k, 0, GDB_OSABI_LINUX,
|
|
or1k_linux_init_abi);
|
|
|
|
/* Initialize the standard target descriptions. */
|
|
initialize_tdesc_or1k_linux ();
|
|
}
|