/* Target-dependent code for GNU/Linux Super-H. Copyright (C) 2005-2018 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 . */ #include "defs.h" #include "osabi.h" #include "solib-svr4.h" #include "symtab.h" #include "trad-frame.h" #include "tramp-frame.h" #include "glibc-tdep.h" #include "sh-tdep.h" #include "linux-tdep.h" #define REGSx16(base) \ {(base), 0}, \ {(base) + 1, 4}, \ {(base) + 2, 8}, \ {(base) + 3, 12}, \ {(base) + 4, 16}, \ {(base) + 5, 20}, \ {(base) + 6, 24}, \ {(base) + 7, 28}, \ {(base) + 8, 32}, \ {(base) + 9, 36}, \ {(base) + 10, 40}, \ {(base) + 11, 44}, \ {(base) + 12, 48}, \ {(base) + 13, 52}, \ {(base) + 14, 56}, \ {(base) + 15, 60} /* Describe the contents of the .reg section of the core file. */ static const struct sh_corefile_regmap gregs_table[] = { REGSx16 (R0_REGNUM), {PC_REGNUM, 64}, {PR_REGNUM, 68}, {SR_REGNUM, 72}, {GBR_REGNUM, 76}, {MACH_REGNUM, 80}, {MACL_REGNUM, 84}, {-1 /* Terminator. */, 0} }; /* Describe the contents of the .reg2 section of the core file. */ static const struct sh_corefile_regmap fpregs_table[] = { REGSx16 (FR0_REGNUM), /* REGSx16 xfp_regs omitted. */ {FPSCR_REGNUM, 128}, {FPUL_REGNUM, 132}, {-1 /* Terminator. */, 0} }; /* SH signal handler frame support. */ static void sh_linux_sigtramp_cache (struct frame_info *this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func, int regs_offset) { int i; struct gdbarch *gdbarch = get_frame_arch (this_frame); CORE_ADDR base = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch)); CORE_ADDR regs = base + regs_offset; for (i = 0; i < 18; i++) trad_frame_set_reg_addr (this_cache, i, regs + i * 4); trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4); trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4); trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4); trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4); /* Restore FP state if we have an FPU. */ if (gdbarch_fp0_regnum (gdbarch) != -1) { CORE_ADDR fpregs = regs + 22 * 4; for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++) trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4); trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4); trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4); } /* Save a frame ID. */ trad_frame_set_id (this_cache, frame_id_build (base, func)); } /* Implement struct tramp_frame "init" callbacks for signal trampolines on 32-bit SH. */ static void sh_linux_sigreturn_init (const struct tramp_frame *self, struct frame_info *this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func) { /* SH 32-bit sigframe: sigcontext at start of sigframe, registers start after a single 'oldmask' word. */ sh_linux_sigtramp_cache (this_frame, this_cache, func, 4); } static void sh_linux_rt_sigreturn_init (const struct tramp_frame *self, struct frame_info *this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func) { /* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then we can find sigcontext embedded within a ucontext (offset 20 bytes). Then registers start after a single 'oldmask' word. */ sh_linux_sigtramp_cache (this_frame, this_cache, func, 128 /* sizeof (struct siginfo) */ + 20 /* offsetof (struct ucontext, uc_mcontext) */ + 4 /* oldmask word at start of sigcontext */); } /* Instruction patterns. */ #define SH_MOVW 0x9305 #define SH_TRAP 0xc300 #define SH_OR_R0_R0 0x200b /* SH sigreturn syscall numbers. */ #define SH_NR_SIGRETURN 0x0077 #define SH_NR_RT_SIGRETURN 0x00ad static struct tramp_frame sh_linux_sigreturn_tramp_frame = { SIGTRAMP_FRAME, 2, { { SH_MOVW, 0xffff }, { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_NR_SIGRETURN, 0xffff }, { TRAMP_SENTINEL_INSN } }, sh_linux_sigreturn_init }; static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = { SIGTRAMP_FRAME, 2, { { SH_MOVW, 0xffff }, { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_OR_R0_R0, 0xffff }, { SH_NR_RT_SIGRETURN, 0xffff }, { TRAMP_SENTINEL_INSN } }, sh_linux_rt_sigreturn_init }; static void sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) { linux_init_abi (info, gdbarch); /* GNU/Linux uses SVR4-style shared libraries. */ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); set_solib_svr4_fetch_link_map_offsets (gdbarch, svr4_ilp32_fetch_link_map_offsets); set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); set_gdbarch_fetch_tls_load_module_address (gdbarch, svr4_fetch_objfile_link_map); /* Core files and signal handler frame unwinding are supported for 32-bit SH only, at present. */ if (info.bfd_arch_info->mach != bfd_mach_sh5) { struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); /* Remember regset characteristics. The sizes should match elf_gregset_t and elf_fpregset_t from Linux. */ tdep->core_gregmap = (struct sh_corefile_regmap *)gregs_table; tdep->sizeof_gregset = 92; tdep->core_fpregmap = (struct sh_corefile_regmap *)fpregs_table; tdep->sizeof_fpregset = 136; tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame); tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame); } } void _initialize_sh_linux_tdep (void) { gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi); }