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Diffstat (limited to 'gdb/or1k-linux-tdep.c')
| -rw-r--r-- | gdb/or1k-linux-tdep.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/gdb/or1k-linux-tdep.c b/gdb/or1k-linux-tdep.c new file mode 100644 index 0000000..7d49f4b --- /dev/null +++ b/gdb/or1k-linux-tdep.c @@ -0,0 +1,170 @@ +/* Target-dependent code for GNU/Linux on OpenRISC processors. + Copyright (C) 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 <http://www.gnu.org/licenses/>. */ + +#include "defs.h" +#include "or1k-tdep.h" +#include "osabi.h" +#include "glibc-tdep.h" +#include "linux-tdep.h" +#include "solib-svr4.h" +#include "regset.h" +#include "tramp-frame.h" +#include "trad-frame.h" + +/* Define the general register mapping. The kernel puts the PC at offset 0, + gdb puts it at offset 32. Register x0 is always 0 and can be ignored. + Registers x1 to x31 are in the same place. */ + +static const struct regcache_map_entry or1k_linux_gregmap[] = +{ + { 32, OR1K_ZERO_REGNUM, 4 }, /* r0 to r31 */ + { 1, OR1K_NPC_REGNUM, 4 }, + { 0 } +}; + +/* Define the general register regset. */ + +static const struct regset or1k_linux_gregset = +{ + or1k_linux_gregmap, regcache_supply_regset, regcache_collect_regset +}; + +/* Define hook for core file support. */ + +static void +or1k_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, + iterate_over_regset_sections_cb *cb, + void *cb_data, + const struct regcache *regcache) +{ + cb (".reg", (33 * 4), (33 * 4), &or1k_linux_gregset, NULL, cb_data); +} + +/* Signal trampoline support. */ + +static void or1k_linux_sigframe_init (const struct tramp_frame *self, + struct frame_info *this_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func); + +#define OR1K_RT_SIGRETURN 139 + +#define OR1K_INST_L_ORI_R11_R0_IMM 0xa9600000 +#define OR1K_INST_L_SYS_1 0x20000001 +#define OR1K_INST_L_NOP 0x15000000 + +static const struct tramp_frame or1k_linux_sigframe = { + SIGTRAMP_FRAME, + 4, + { + { OR1K_INST_L_ORI_R11_R0_IMM | OR1K_RT_SIGRETURN, ULONGEST_MAX }, + { OR1K_INST_L_SYS_1, ULONGEST_MAX }, + { OR1K_INST_L_NOP, ULONGEST_MAX }, + { TRAMP_SENTINEL_INSN } + }, + or1k_linux_sigframe_init, + NULL +}; + +/* Runtime signal frames look like this: + struct rt_sigframe { + struct siginfo info; + struct ucontext uc; + unsigned char retcode[16]; + }; + + struct ucontext { + unsigned long uc_flags; - 4 + struct ucontext *uc_link; - 4 + stack_t uc_stack; - 4 * 3 + struct sigcontext uc_mcontext; + sigset_t uc_sigmask; + }; + + struct sigcontext { + struct user_regs_struct regs; + unsigned long oldmask; + }; + + struct user_regs_struct { + unsigned long gpr[32]; + unsigned long pc; + unsigned long sr; + }; */ + +#define SIGFRAME_SIGINFO_SIZE 128 +#define UCONTEXT_MCONTEXT_OFFSET 20 + +static void +or1k_linux_sigframe_init (const struct tramp_frame *self, + struct frame_info *this_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func) +{ + CORE_ADDR frame_sp = get_frame_sp (this_frame); + CORE_ADDR mcontext_base; + CORE_ADDR regs_base; + + mcontext_base = frame_sp + SIGFRAME_SIGINFO_SIZE + UCONTEXT_MCONTEXT_OFFSET; + + /* Handle the general registers 0-31 followed by the PC. */ + regs_base = mcontext_base; + for (int i = 0; i < 32; i++) + trad_frame_set_reg_addr (this_cache, OR1K_ZERO_REGNUM + i, + regs_base + (i * 4)); + trad_frame_set_reg_addr (this_cache, OR1K_NPC_REGNUM, regs_base + (32 * 4)); + trad_frame_set_reg_addr (this_cache, OR1K_SR_REGNUM, regs_base + (33 * 4)); + + /* Choice of the bottom of the sigframe is somewhat arbitrary. */ + trad_frame_set_id (this_cache, frame_id_build (frame_sp, func)); +} + +/* Initialize OpenRISC Linux ABI info. */ + +static void +or1k_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + linux_init_abi (info, gdbarch); + + set_solib_svr4_fetch_link_map_offsets (gdbarch, + svr4_ilp32_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); + + set_gdbarch_iterate_over_regset_sections + (gdbarch, or1k_linux_iterate_over_regset_sections); + + tramp_frame_prepend_unwinder (gdbarch, &or1k_linux_sigframe); +} + +/* Initialize OpenRISC Linux target support. */ + +void +_initialize_or1k_linux_tdep (void) +{ + gdbarch_register_osabi (bfd_arch_or1k, 0, GDB_OSABI_LINUX, + or1k_linux_init_abi); +} |