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/* Target-dependent code for GNU/Linux on LoongArch processors.
Copyright (C) 2022 Free Software Foundation, Inc.
Contributed by Loongson Ltd.
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 "glibc-tdep.h"
#include "inferior.h"
#include "linux-tdep.h"
#include "loongarch-tdep.h"
#include "solib-svr4.h"
#include "target-descriptions.h"
#include "trad-frame.h"
#include "tramp-frame.h"
/* Unpack an elf_gregset_t into GDB's register cache. */
static void
loongarch_supply_gregset (const struct regset *r,
struct regcache *regcache, int regno,
const void *gprs, size_t len)
{
loongarch_gdbarch_tdep *tdep
= (loongarch_gdbarch_tdep *) gdbarch_tdep (regcache->arch ());
auto regs = tdep->regs;
int regsize = register_size (regcache->arch (), regs.r);
const gdb_byte *buf = nullptr;
if (regno == -1)
{
/* Set $r0 = 0. */
regcache->raw_supply_zeroed (regs.r);
for (int i = 1; i < 32; i++)
{
buf = (const gdb_byte*) gprs + regsize * i;
regcache->raw_supply (regs.r + i, (const void *) buf);
}
/* Size base (pc) = regsize * regs.pc. */
buf = (const gdb_byte*) gprs + regsize * regs.pc;
regcache->raw_supply (regs.pc, (const void *) buf);
/* Size base (badv) = regsize * regs.badv. */
buf = (const gdb_byte*) gprs + regsize * regs.badv;
regcache->raw_supply (regs.badv, (const void *) buf);
}
else if (regs.r == regno)
regcache->raw_supply_zeroed (regno);
else if ((regs.r < regno && regno < regs.r + 32)
|| regs.pc == regno || regs.badv == regno)
{
/* Offset offset (regno) = regsize * (regno - regs.r). */
buf = (const gdb_byte*) gprs + regsize * (regno - regs.r);
regcache->raw_supply (regno, (const void *) buf);
}
}
/* Pack the GDB's register cache value into an elf_gregset_t. */
static void
loongarch_fill_gregset (const struct regset *r,
const struct regcache *regcache, int regno,
void *gprs, size_t len)
{
loongarch_gdbarch_tdep *tdep
= (loongarch_gdbarch_tdep *) gdbarch_tdep (regcache->arch ());
auto regs = tdep->regs;
int regsize = register_size (regcache->arch (), regs.r);
gdb_byte *buf = nullptr;
if (regno == -1)
{
for (int i = 0; i < 32; i++)
{
buf = (gdb_byte *) gprs + regsize * i;
regcache->raw_collect (regs.r + i, (void *) buf);
}
/* Size base (pc) = regsize * regs.pc. */
buf = (gdb_byte *) gprs + regsize * regs.pc;
regcache->raw_collect (regs.pc, (void *) buf);
/* Size base (badv) = regsize * regs.badv. */
buf = (gdb_byte *) gprs + regsize * regs.badv;
regcache->raw_collect (regs.badv, (void *) buf);
}
else if ((regs.r <= regno && regno < regs.r + 32)
|| regs.pc == regno || regs.badv == regno)
{
/* Offset offset (regno) = regsize * (regno - regs.r). */
buf = (gdb_byte *) gprs + regsize * (regno - regs.r);
regcache->raw_collect (regno, (void *) buf);
}
}
/* Register set definitions. */
const struct regset loongarch_gregset =
{
nullptr,
loongarch_supply_gregset,
loongarch_fill_gregset,
};
/* Implement the "init" method of struct tramp_frame. */
#define LOONGARCH_RT_SIGFRAME_UCONTEXT_OFFSET 128
#define LOONGARCH_UCONTEXT_SIGCONTEXT_OFFSET 176
static void
loongarch_linux_rt_sigframe_init (const struct tramp_frame *self,
struct frame_info *this_frame,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
struct gdbarch *gdbarch = get_frame_arch (this_frame);
loongarch_gdbarch_tdep *tdep = (loongarch_gdbarch_tdep *) gdbarch_tdep (gdbarch);
auto regs = tdep->regs;
CORE_ADDR frame_sp = get_frame_sp (this_frame);
CORE_ADDR sigcontext_base = (frame_sp + LOONGARCH_RT_SIGFRAME_UCONTEXT_OFFSET
+ LOONGARCH_UCONTEXT_SIGCONTEXT_OFFSET);
trad_frame_set_reg_addr (this_cache, regs.pc, sigcontext_base);
for (int i = 0; i < 32; i++)
trad_frame_set_reg_addr (this_cache, regs.r + i, sigcontext_base + 8 + i * 8);
trad_frame_set_id (this_cache, frame_id_build (frame_sp, func));
}
/* li.w a7, __NR_rt_sigreturn */
#define LOONGARCH_INST_LIW_A7_RT_SIGRETURN 0x03822c0b
/* syscall 0 */
#define LOONGARCH_INST_SYSCALL 0x002b0000
static const struct tramp_frame loongarch_linux_rt_sigframe =
{
SIGTRAMP_FRAME,
4,
{
{ LOONGARCH_INST_LIW_A7_RT_SIGRETURN, ULONGEST_MAX },
{ LOONGARCH_INST_SYSCALL, ULONGEST_MAX },
{ TRAMP_SENTINEL_INSN, ULONGEST_MAX }
},
loongarch_linux_rt_sigframe_init,
NULL
};
/* Initialize LoongArch Linux ABI info. */
static void
loongarch_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
linux_init_abi (info, gdbarch, 0);
set_solib_svr4_fetch_link_map_offsets (gdbarch,
info.bfd_arch_info->bits_per_address == 32
? linux_ilp32_fetch_link_map_offsets
: linux_lp64_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);
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch, svr4_fetch_objfile_link_map);
/* Prepend tramp frame unwinder for signal. */
tramp_frame_prepend_unwinder (gdbarch, &loongarch_linux_rt_sigframe);
}
/* Initialize LoongArch Linux target support. */
void _initialize_loongarch_linux_tdep ();
void
_initialize_loongarch_linux_tdep ()
{
gdbarch_register_osabi (bfd_arch_loongarch, bfd_mach_loongarch32,
GDB_OSABI_LINUX, loongarch_linux_init_abi);
gdbarch_register_osabi (bfd_arch_loongarch, bfd_mach_loongarch64,
GDB_OSABI_LINUX, loongarch_linux_init_abi);
}
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