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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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