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223 lines
6.6 KiB
C
223 lines
6.6 KiB
C
/* Target-dependent code for GNU/Linux Super-H.
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Copyright (C) 2005-2017 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 "defs.h"
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#include "osabi.h"
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#include "solib-svr4.h"
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#include "symtab.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "glibc-tdep.h"
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#include "sh-tdep.h"
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#include "linux-tdep.h"
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#define REGSx16(base) \
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{(base), 0}, \
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{(base) + 1, 4}, \
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{(base) + 2, 8}, \
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{(base) + 3, 12}, \
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{(base) + 4, 16}, \
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{(base) + 5, 20}, \
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{(base) + 6, 24}, \
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{(base) + 7, 28}, \
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{(base) + 8, 32}, \
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{(base) + 9, 36}, \
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{(base) + 10, 40}, \
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{(base) + 11, 44}, \
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{(base) + 12, 48}, \
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{(base) + 13, 52}, \
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{(base) + 14, 56}, \
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{(base) + 15, 60}
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/* Describe the contents of the .reg section of the core file. */
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static const struct sh_corefile_regmap gregs_table[] =
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{
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REGSx16 (R0_REGNUM),
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{PC_REGNUM, 64},
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{PR_REGNUM, 68},
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{SR_REGNUM, 72},
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{GBR_REGNUM, 76},
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{MACH_REGNUM, 80},
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{MACL_REGNUM, 84},
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{-1 /* Terminator. */, 0}
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};
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/* Describe the contents of the .reg2 section of the core file. */
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static const struct sh_corefile_regmap fpregs_table[] =
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{
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REGSx16 (FR0_REGNUM),
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/* REGSx16 xfp_regs omitted. */
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{FPSCR_REGNUM, 128},
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{FPUL_REGNUM, 132},
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{-1 /* Terminator. */, 0}
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};
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/* SH signal handler frame support. */
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static void
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sh_linux_sigtramp_cache (struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func, int regs_offset)
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{
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int i;
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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CORE_ADDR base = get_frame_register_unsigned (this_frame,
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gdbarch_sp_regnum (gdbarch));
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CORE_ADDR regs = base + regs_offset;
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for (i = 0; i < 18; i++)
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trad_frame_set_reg_addr (this_cache, i, regs + i * 4);
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trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4);
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trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4);
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trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4);
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trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4);
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/* Restore FP state if we have an FPU. */
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if (gdbarch_fp0_regnum (gdbarch) != -1)
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{
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CORE_ADDR fpregs = regs + 22 * 4;
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for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++)
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trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4);
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trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4);
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trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4);
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}
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/* Save a frame ID. */
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trad_frame_set_id (this_cache, frame_id_build (base, func));
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}
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/* Implement struct tramp_frame "init" callbacks for signal
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trampolines on 32-bit SH. */
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static void
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sh_linux_sigreturn_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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/* SH 32-bit sigframe: sigcontext at start of sigframe,
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registers start after a single 'oldmask' word. */
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sh_linux_sigtramp_cache (this_frame, this_cache, func, 4);
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}
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static void
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sh_linux_rt_sigreturn_init (const struct tramp_frame *self,
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struct frame_info *this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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/* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then
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we can find sigcontext embedded within a ucontext (offset 20 bytes).
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Then registers start after a single 'oldmask' word. */
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sh_linux_sigtramp_cache (this_frame, this_cache, func,
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128 /* sizeof (struct siginfo) */
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+ 20 /* offsetof (struct ucontext, uc_mcontext) */
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+ 4 /* oldmask word at start of sigcontext */);
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}
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/* Instruction patterns. */
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#define SH_MOVW 0x9305
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#define SH_TRAP 0xc300
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#define SH_OR_R0_R0 0x200b
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/* SH sigreturn syscall numbers. */
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#define SH_NR_SIGRETURN 0x0077
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#define SH_NR_RT_SIGRETURN 0x00ad
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static struct tramp_frame sh_linux_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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2,
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{
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{ SH_MOVW, 0xffff },
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{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_NR_SIGRETURN, 0xffff },
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{ TRAMP_SENTINEL_INSN }
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},
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sh_linux_sigreturn_init
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};
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static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = {
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SIGTRAMP_FRAME,
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2,
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{
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{ SH_MOVW, 0xffff },
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{ SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_OR_R0_R0, 0xffff },
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{ SH_NR_RT_SIGRETURN, 0xffff },
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{ TRAMP_SENTINEL_INSN }
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},
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sh_linux_rt_sigreturn_init
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};
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static void
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sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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linux_init_abi (info, gdbarch);
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/* GNU/Linux uses SVR4-style shared libraries. */
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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/* Core files and signal handler frame unwinding are supported for
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32-bit SH only, at present. */
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if (info.bfd_arch_info->mach != bfd_mach_sh5)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Remember regset characteristics. The sizes should match
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elf_gregset_t and elf_fpregset_t from Linux. */
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tdep->core_gregmap = (struct sh_corefile_regmap *)gregs_table;
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tdep->sizeof_gregset = 92;
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tdep->core_fpregmap = (struct sh_corefile_regmap *)fpregs_table;
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tdep->sizeof_fpregset = 136;
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tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame);
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tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame);
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}
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern void _initialize_sh_linux_tdep (void);
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void
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_initialize_sh_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi);
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}
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