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Diffstat (limited to 'gdb/nios2-linux-tdep.c')
| -rw-r--r-- | gdb/nios2-linux-tdep.c | 262 |
1 files changed, 0 insertions, 262 deletions
diff --git a/gdb/nios2-linux-tdep.c b/gdb/nios2-linux-tdep.c deleted file mode 100644 index bd5f6cf..0000000 --- a/gdb/nios2-linux-tdep.c +++ /dev/null @@ -1,262 +0,0 @@ -/* Target-dependent code for GNU/Linux on Nios II. - Copyright (C) 2012-2024 Free Software Foundation, Inc. - Contributed by Mentor Graphics, 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 "frame.h" -#include "osabi.h" -#include "solib-svr4.h" -#include "trad-frame.h" -#include "tramp-frame.h" -#include "symtab.h" -#include "regset.h" -#include "regcache.h" -#include "linux-tdep.h" -#include "glibc-tdep.h" -#include "nios2-tdep.h" -#include "gdbarch.h" - -/* Core file and register set support. */ - -/* Map from the normal register enumeration order to the order that - registers appear in core files, which corresponds to the order - of the register slots in the kernel's struct pt_regs. */ - -static const int reg_offsets[NIOS2_NUM_REGS] = -{ - -1, 8, 9, 10, 11, 12, 13, 14, /* r0 - r7 */ - 0, 1, 2, 3, 4, 5, 6, 7, /* r8 - r15 */ - 23, 24, 25, 26, 27, 28, 29, 30, /* r16 - r23 */ - -1, -1, 19, 18, 17, 21, -1, 16, /* et bt gp sp fp ea sstatus ra */ - 21, /* pc */ - -1, 20, -1, -1, -1, -1, -1, -1, /* status estatus ... */ - -1, -1, -1, -1, -1, -1, -1, -1 -}; - -/* General register set size. Should match sizeof (struct pt_regs) + - sizeof (struct switch_stack) from the NIOS2 Linux kernel patch. */ - -#define NIOS2_GREGS_SIZE (4 * 34) - -/* Implement the supply_regset hook for core files. */ - -static void -nios2_supply_gregset (const struct regset *regset, - struct regcache *regcache, - int regnum, const void *gregs_buf, size_t len) -{ - const gdb_byte *gregs = (const gdb_byte *) gregs_buf; - int regno; - static const gdb_byte zero_buf[4] = {0, 0, 0, 0}; - - for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++) - if (regnum == -1 || regnum == regno) - { - if (reg_offsets[regno] != -1) - regcache->raw_supply (regno, gregs + 4 * reg_offsets[regno]); - else - regcache->raw_supply (regno, zero_buf); - } -} - -/* Implement the collect_regset hook for core files. */ - -static void -nios2_collect_gregset (const struct regset *regset, - const struct regcache *regcache, - int regnum, void *gregs_buf, size_t len) -{ - gdb_byte *gregs = (gdb_byte *) gregs_buf; - int regno; - - for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++) - if (regnum == -1 || regnum == regno) - { - if (reg_offsets[regno] != -1) - regcache->raw_collect (regno, gregs + 4 * reg_offsets[regno]); - } -} - -static const struct regset nios2_core_regset = -{ - NULL, - nios2_supply_gregset, - nios2_collect_gregset -}; - -/* Iterate over core file register note sections. */ - -static void -nios2_iterate_over_regset_sections (struct gdbarch *gdbarch, - iterate_over_regset_sections_cb *cb, - void *cb_data, - const struct regcache *regcache) -{ - cb (".reg", NIOS2_GREGS_SIZE, NIOS2_GREGS_SIZE, &nios2_core_regset, NULL, - cb_data); -} - -/* Initialize a trad-frame cache corresponding to the tramp-frame. - FUNC is the address of the instruction TRAMP[0] in memory. - - This ABI is not documented. It corresponds to rt_setup_ucontext in - the kernel arch/nios2/kernel/signal.c file. - - The key points are: - - The kernel creates a trampoline at the hard-wired address 0x1044. - - The stack pointer points to an object of type struct rt_sigframe. - The definition of this structure is not exported from the kernel. - The register save area is located at offset 152 bytes (as determined - by inspection of the stack contents in the debugger), and the - registers are saved as r1-r23, ra, fp, gp, ea, sp. - - This interface was implemented with kernel version 3.19 (the first - official mainline kernel). Older unofficial kernel versions used - incompatible conventions; we do not support those here. */ - -#define NIOS2_SIGRETURN_TRAMP_ADDR 0x1044 -#define NIOS2_SIGRETURN_REGSAVE_OFFSET 152 - -static void -nios2_linux_rt_sigreturn_init (const struct tramp_frame *self, - const frame_info_ptr &next_frame, - struct trad_frame_cache *this_cache, - CORE_ADDR func) -{ - CORE_ADDR sp = get_frame_register_unsigned (next_frame, NIOS2_SP_REGNUM); - CORE_ADDR base = sp + NIOS2_SIGRETURN_REGSAVE_OFFSET; - int i; - - for (i = 0; i < 23; i++) - trad_frame_set_reg_addr (this_cache, i + 1, base + i * 4); - trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 23 * 4); - trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 24 * 4); - trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 25 * 4); - trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 27 * 4); - trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 28 * 4); - - /* Save a frame ID. */ - trad_frame_set_id (this_cache, frame_id_build (base, func)); -} - -/* Trampoline for sigreturn. This has the form - movi r2, __NR_rt_sigreturn - trap 0 - appropriately encoded for R1 or R2. */ - -static struct tramp_frame nios2_r1_linux_rt_sigreturn_tramp_frame = -{ - SIGTRAMP_FRAME, - 4, - { - { MATCH_R1_MOVI | SET_IW_I_B (2) | SET_IW_I_IMM16 (139), ULONGEST_MAX }, - { MATCH_R1_TRAP | SET_IW_R_IMM5 (0), ULONGEST_MAX}, - { TRAMP_SENTINEL_INSN } - }, - nios2_linux_rt_sigreturn_init -}; - -static struct tramp_frame nios2_r2_linux_rt_sigreturn_tramp_frame = -{ - SIGTRAMP_FRAME, - 4, - { - { MATCH_R2_MOVI | SET_IW_F2I16_B (2) | SET_IW_F2I16_IMM16 (139), ULONGEST_MAX }, - { MATCH_R2_TRAP | SET_IW_X2L5_IMM5 (0), ULONGEST_MAX}, - { TRAMP_SENTINEL_INSN } - }, - nios2_linux_rt_sigreturn_init -}; - -/* When FRAME is at a syscall instruction, return the PC of the next - instruction to be executed. */ - -static CORE_ADDR -nios2_linux_syscall_next_pc (const frame_info_ptr &frame, - const struct nios2_opcode *op) -{ - CORE_ADDR pc = get_frame_pc (frame); - ULONGEST syscall_nr = get_frame_register_unsigned (frame, NIOS2_R2_REGNUM); - - /* If we are about to make a sigreturn syscall, use the unwinder to - decode the signal frame. */ - if (syscall_nr == 139 /* rt_sigreturn */) - return frame_unwind_caller_pc (frame); - - return pc + op->size; -} - -/* Return true if PC is a kernel helper, a function mapped by the kernel - into user space on an unwritable page. Currently the only such function - is __kuser_cmpxchg at 0x1004. See arch/nios2/kernel/entry.S in the Linux - kernel sources and sysdeps/unix/sysv/linux/nios2/atomic-machine.h in - GLIBC. */ -static bool -nios2_linux_is_kernel_helper (CORE_ADDR pc) -{ - return pc == 0x1004; -} - -/* Hook function for gdbarch_register_osabi. */ - -static void -nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) -{ - nios2_gdbarch_tdep *tdep = gdbarch_tdep<nios2_gdbarch_tdep> (gdbarch); - - linux_init_abi (info, gdbarch, 0); - - /* Shared library handling. */ - set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); - set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); - - set_solib_svr4_fetch_link_map_offsets (gdbarch, - linux_ilp32_fetch_link_map_offsets); - /* Enable TLS support. */ - set_gdbarch_fetch_tls_load_module_address (gdbarch, - svr4_fetch_objfile_link_map); - /* Core file support. */ - set_gdbarch_iterate_over_regset_sections - (gdbarch, nios2_iterate_over_regset_sections); - /* Linux signal frame unwinders. */ - if (gdbarch_bfd_arch_info (gdbarch)->mach == bfd_mach_nios2r2) - tramp_frame_prepend_unwinder (gdbarch, - &nios2_r2_linux_rt_sigreturn_tramp_frame); - else - tramp_frame_prepend_unwinder (gdbarch, - &nios2_r1_linux_rt_sigreturn_tramp_frame); - - tdep->syscall_next_pc = nios2_linux_syscall_next_pc; - tdep->is_kernel_helper = nios2_linux_is_kernel_helper; - - /* Index of target address word in glibc jmp_buf. */ - tdep->jb_pc = 10; -} - -void _initialize_nios2_linux_tdep (); -void -_initialize_nios2_linux_tdep () -{ - - const struct bfd_arch_info *arch_info; - - for (arch_info = bfd_lookup_arch (bfd_arch_nios2, 0); - arch_info != NULL; - arch_info = arch_info->next) - gdbarch_register_osabi (bfd_arch_nios2, arch_info->mach, - GDB_OSABI_LINUX, nios2_linux_init_abi); -} |