mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-23 10:03:47 +08:00
a9ed7a0814
This reverts commit 98bcde5e26. This
commit was causing build problems on at least sparc, ppc, and s390,
though I suspect some other targets might be impacted too.
395 lines
12 KiB
C++
395 lines
12 KiB
C++
/* GNU/Linux/LoongArch specific low level interface, for the remote server
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for GDB.
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Copyright (C) 2022-2024 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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#include "linux-low.h"
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#include "tdesc.h"
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#include "elf/common.h"
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#include "arch/loongarch.h"
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/* Linux target ops definitions for the LoongArch architecture. */
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class loongarch_target : public linux_process_target
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{
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public:
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const regs_info *get_regs_info () override;
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int breakpoint_kind_from_pc (CORE_ADDR *pcptr) override;
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const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
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protected:
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void low_arch_setup () override;
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bool low_cannot_fetch_register (int regno) override;
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bool low_cannot_store_register (int regno) override;
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bool low_fetch_register (regcache *regcache, int regno) override;
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bool low_supports_breakpoints () override;
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CORE_ADDR low_get_pc (regcache *regcache) override;
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void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
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bool low_breakpoint_at (CORE_ADDR pc) override;
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};
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/* The singleton target ops object. */
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static loongarch_target the_loongarch_target;
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bool
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loongarch_target::low_cannot_fetch_register (int regno)
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{
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gdb_assert_not_reached ("linux target op low_cannot_fetch_register "
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"is not implemented by the target");
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}
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bool
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loongarch_target::low_cannot_store_register (int regno)
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{
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gdb_assert_not_reached ("linux target op low_cannot_store_register "
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"is not implemented by the target");
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}
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/* Implementation of linux target ops method "low_arch_setup". */
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void
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loongarch_target::low_arch_setup ()
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{
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static const char *expedite_regs[] = { "r3", "pc", NULL };
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loongarch_gdbarch_features features;
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target_desc_up tdesc;
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features.xlen = sizeof (elf_greg_t);
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tdesc = loongarch_create_target_description (features);
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if (tdesc->expedite_regs.empty ())
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{
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init_target_desc (tdesc.get (), expedite_regs);
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gdb_assert (!tdesc->expedite_regs.empty ());
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}
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current_process ()->tdesc = tdesc.release ();
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}
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/* Collect GPRs from REGCACHE into BUF. */
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static void
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loongarch_fill_gregset (struct regcache *regcache, void *buf)
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{
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elf_gregset_t *regset = (elf_gregset_t *) buf;
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int i;
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for (i = 1; i < 32; i++)
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collect_register (regcache, i, *regset + i);
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collect_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
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collect_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
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collect_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
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}
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/* Supply GPRs from BUF into REGCACHE. */
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static void
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loongarch_store_gregset (struct regcache *regcache, const void *buf)
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{
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const elf_gregset_t *regset = (const elf_gregset_t *) buf;
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int i;
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supply_register_zeroed (regcache, 0);
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for (i = 1; i < 32; i++)
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supply_register (regcache, i, *regset + i);
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supply_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
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supply_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
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supply_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
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}
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/* Collect FPRs from REGCACHE into BUF. */
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static void
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loongarch_fill_fpregset (struct regcache *regcache, void *buf)
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{
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gdb_byte *regbuf = nullptr;
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int fprsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FP_REGNUM);
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int fccsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FCC_REGNUM);
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for (int i = 0; i < LOONGARCH_LINUX_NUM_FPREGSET; i++)
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{
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regbuf = (gdb_byte *)buf + fprsize * i;
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collect_register (regcache, LOONGARCH_FIRST_FP_REGNUM + i, regbuf);
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}
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for (int i = 0; i < LOONGARCH_LINUX_NUM_FCC; i++)
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{
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regbuf = (gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
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fccsize * i;
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collect_register (regcache, LOONGARCH_FIRST_FCC_REGNUM + i, regbuf);
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}
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regbuf = (gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
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fccsize * LOONGARCH_LINUX_NUM_FCC;
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collect_register (regcache, LOONGARCH_FCSR_REGNUM, regbuf);
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}
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/* Supply FPRs from BUF into REGCACHE. */
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static void
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loongarch_store_fpregset (struct regcache *regcache, const void *buf)
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{
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const gdb_byte *regbuf = nullptr;
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int fprsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FP_REGNUM);
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int fccsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FCC_REGNUM);
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for (int i = 0; i < LOONGARCH_LINUX_NUM_FPREGSET; i++)
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{
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regbuf = (const gdb_byte *)buf + fprsize * i;
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supply_register (regcache, LOONGARCH_FIRST_FP_REGNUM + i, regbuf);
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}
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for (int i = 0; i < LOONGARCH_LINUX_NUM_FCC; i++)
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{
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regbuf = (const gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
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fccsize * i;
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supply_register (regcache, LOONGARCH_FIRST_FCC_REGNUM + i, regbuf);
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}
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regbuf = (const gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
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fccsize * LOONGARCH_LINUX_NUM_FCC;
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supply_register (regcache, LOONGARCH_FCSR_REGNUM, regbuf);
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}
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/* Collect lsx regs from REGCACHE into BUF. */
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static void
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loongarch_fill_lsxregset (struct regcache *regcache, void *buf)
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{
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elf_lsxregset_t *regset = (elf_lsxregset_t *) buf;
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int i;
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for (i = 0; i < LOONGARCH_LINUX_NUM_LSXREGSET; i++)
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collect_register (regcache, LOONGARCH_FIRST_LSX_REGNUM + i, *regset + i);
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}
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/* Supply lsx regs from BUF into REGCACHE. */
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static void
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loongarch_store_lsxregset (struct regcache *regcache, const void *buf)
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{
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const elf_lsxregset_t *regset = (const elf_lsxregset_t *) buf;
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int i;
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for (i = 0; i < LOONGARCH_LINUX_NUM_LSXREGSET; i++)
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supply_register (regcache, LOONGARCH_FIRST_LSX_REGNUM + i, *regset + i);
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}
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/* Collect lasx regs from REGCACHE into BUF. */
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static void
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loongarch_fill_lasxregset (struct regcache *regcache, void *buf)
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{
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elf_lasxregset_t *regset = (elf_lasxregset_t *) buf;
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int i;
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for (i = 0; i < LOONGARCH_LINUX_NUM_LASXREGSET; i++)
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collect_register (regcache, LOONGARCH_FIRST_LASX_REGNUM + i, *regset + i);
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}
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/* Supply lasx regs from BUF into REGCACHE. */
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static void
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loongarch_store_lasxregset (struct regcache *regcache, const void *buf)
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{
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const elf_lasxregset_t *regset = (const elf_lasxregset_t *) buf;
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int i;
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for (i = 0; i < LOONGARCH_LINUX_NUM_LASXREGSET; i++)
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supply_register (regcache, LOONGARCH_FIRST_LASX_REGNUM + i, *regset + i);
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}
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/* Collect lbt regs from REGCACHE into BUF. */
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static void
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loongarch_fill_lbtregset (struct regcache *regcache, void *buf)
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{
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gdb_byte *regbuf = (gdb_byte*)buf;
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int scrsize = register_size (regcache->tdesc, LOONGARCH_FIRST_SCR_REGNUM);
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int eflagssize = register_size (regcache->tdesc, LOONGARCH_EFLAGS_REGNUM);
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int i;
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for (i = 0; i < LOONGARCH_LINUX_NUM_SCR; i++)
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collect_register (regcache, LOONGARCH_FIRST_SCR_REGNUM + i, regbuf + scrsize * i);
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collect_register (regcache, LOONGARCH_EFLAGS_REGNUM,
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regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize);
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collect_register (regcache, LOONGARCH_FTOP_REGNUM,
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regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize + eflagssize);
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}
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/* Supply lbt regs from BUF into REGCACHE. */
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static void
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loongarch_store_lbtregset (struct regcache *regcache, const void *buf)
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{
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gdb_byte *regbuf = (gdb_byte*)buf;
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int scrsize = register_size (regcache->tdesc, LOONGARCH_FIRST_SCR_REGNUM);
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int eflagssize = register_size (regcache->tdesc, LOONGARCH_EFLAGS_REGNUM);
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int i;
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for (i = 0; i < LOONGARCH_LINUX_NUM_SCR; i++)
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supply_register (regcache, LOONGARCH_FIRST_SCR_REGNUM + i, regbuf + scrsize * i);
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supply_register (regcache, LOONGARCH_EFLAGS_REGNUM,
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regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize);
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supply_register (regcache, LOONGARCH_FTOP_REGNUM,
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regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize + eflagssize);
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}
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/* LoongArch/Linux regsets. */
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static struct regset_info loongarch_regsets[] = {
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, sizeof (elf_gregset_t),
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GENERAL_REGS, loongarch_fill_gregset, loongarch_store_gregset },
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_FPREGSET, sizeof (elf_fpregset_t),
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FP_REGS, loongarch_fill_fpregset, loongarch_store_fpregset },
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LSX, sizeof (elf_lsxregset_t),
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OPTIONAL_REGS, loongarch_fill_lsxregset, loongarch_store_lsxregset },
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LASX, sizeof (elf_lasxregset_t),
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OPTIONAL_REGS, loongarch_fill_lasxregset, loongarch_store_lasxregset },
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{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LBT, LOONGARCH_LBT_REGS_SIZE,
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OPTIONAL_REGS, loongarch_fill_lbtregset, loongarch_store_lbtregset },
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NULL_REGSET
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};
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/* LoongArch/Linux regset information. */
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static struct regsets_info loongarch_regsets_info =
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{
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loongarch_regsets, /* regsets */
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0, /* num_regsets */
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NULL, /* disabled_regsets */
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};
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/* Definition of linux_target_ops data member "regs_info". */
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static struct regs_info loongarch_regs =
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{
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NULL, /* regset_bitmap */
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NULL, /* usrregs */
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&loongarch_regsets_info,
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};
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/* Implementation of linux target ops method "get_regs_info". */
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const regs_info *
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loongarch_target::get_regs_info ()
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{
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return &loongarch_regs;
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}
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/* Implementation of linux target ops method "low_fetch_register". */
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bool
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loongarch_target::low_fetch_register (regcache *regcache, int regno)
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{
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if (regno != 0)
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return false;
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supply_register_zeroed (regcache, 0);
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return true;
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}
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bool
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loongarch_target::low_supports_breakpoints ()
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{
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return true;
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}
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/* Implementation of linux target ops method "low_get_pc". */
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CORE_ADDR
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loongarch_target::low_get_pc (regcache *regcache)
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{
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if (register_size (regcache->tdesc, 0) == 8)
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return linux_get_pc_64bit (regcache);
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else
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return linux_get_pc_32bit (regcache);
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}
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/* Implementation of linux target ops method "low_set_pc". */
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void
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loongarch_target::low_set_pc (regcache *regcache, CORE_ADDR newpc)
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{
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if (register_size (regcache->tdesc, 0) == 8)
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linux_set_pc_64bit (regcache, newpc);
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else
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linux_set_pc_32bit (regcache, newpc);
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}
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#define loongarch_breakpoint_len 4
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/* LoongArch BRK software debug mode instruction.
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This instruction needs to match gdb/loongarch-tdep.c
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(loongarch_default_breakpoint). */
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static const gdb_byte loongarch_breakpoint[] = {0x05, 0x00, 0x2a, 0x00};
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/* Implementation of target ops method "breakpoint_kind_from_pc". */
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int
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loongarch_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr)
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{
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return loongarch_breakpoint_len;
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}
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/* Implementation of target ops method "sw_breakpoint_from_kind". */
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const gdb_byte *
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loongarch_target::sw_breakpoint_from_kind (int kind, int *size)
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{
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*size = loongarch_breakpoint_len;
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return (const gdb_byte *) &loongarch_breakpoint;
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}
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/* Implementation of linux target ops method "low_breakpoint_at". */
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bool
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loongarch_target::low_breakpoint_at (CORE_ADDR pc)
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{
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gdb_byte insn[loongarch_breakpoint_len];
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read_memory (pc, (unsigned char *) &insn, loongarch_breakpoint_len);
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if (memcmp (insn, loongarch_breakpoint, loongarch_breakpoint_len) == 0)
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return true;
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return false;
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}
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/* The linux target ops object. */
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linux_process_target *the_linux_target = &the_loongarch_target;
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/* Initialize the LoongArch/Linux target. */
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void
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initialize_low_arch ()
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{
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initialize_regsets_info (&loongarch_regsets_info);
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}
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