| 1 | /* Target-dependent code for GNU/Linux on RISC-V processors. |
| 2 | Copyright (C) 2018 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "defs.h" |
| 20 | #include "riscv-tdep.h" |
| 21 | #include "osabi.h" |
| 22 | #include "glibc-tdep.h" |
| 23 | #include "linux-tdep.h" |
| 24 | #include "solib-svr4.h" |
| 25 | #include "regset.h" |
| 26 | |
| 27 | /* Define the general register mapping. The kernel puts the PC at offset 0, |
| 28 | gdb puts it at offset 32. Register x0 is always 0 and can be ignored. |
| 29 | Registers x1 to x31 are in the same place. */ |
| 30 | |
| 31 | static const struct regcache_map_entry riscv_linux_gregmap[] = |
| 32 | { |
| 33 | { 1, RISCV_PC_REGNUM, 0 }, |
| 34 | { 31, RISCV_RA_REGNUM, 0 }, /* x1 to x31 */ |
| 35 | { 0 } |
| 36 | }; |
| 37 | |
| 38 | /* Define the general register regset. */ |
| 39 | |
| 40 | static const struct regset riscv_linux_gregset = |
| 41 | { |
| 42 | riscv_linux_gregmap, regcache_supply_regset, regcache_collect_regset |
| 43 | }; |
| 44 | |
| 45 | /* Define hook for core file support. */ |
| 46 | |
| 47 | static void |
| 48 | riscv_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 49 | iterate_over_regset_sections_cb *cb, |
| 50 | void *cb_data, |
| 51 | const struct regcache *regcache) |
| 52 | { |
| 53 | cb (".reg", (32 * riscv_isa_xlen (gdbarch)), |
| 54 | &riscv_linux_gregset, NULL, cb_data); |
| 55 | |
| 56 | /* TODO: Add FP register support. */ |
| 57 | } |
| 58 | |
| 59 | /* Initialize RISC-V Linux ABI info. */ |
| 60 | |
| 61 | static void |
| 62 | riscv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 63 | { |
| 64 | linux_init_abi (info, gdbarch); |
| 65 | |
| 66 | set_gdbarch_software_single_step (gdbarch, riscv_software_single_step); |
| 67 | |
| 68 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 69 | (riscv_isa_xlen (gdbarch) == 4 |
| 70 | ? svr4_ilp32_fetch_link_map_offsets |
| 71 | : svr4_lp64_fetch_link_map_offsets)); |
| 72 | |
| 73 | /* GNU/Linux uses SVR4-style shared libraries. */ |
| 74 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| 75 | |
| 76 | /* GNU/Linux uses the dynamic linker included in the GNU C Library. */ |
| 77 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| 78 | |
| 79 | /* Enable TLS support. */ |
| 80 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 81 | svr4_fetch_objfile_link_map); |
| 82 | |
| 83 | set_gdbarch_iterate_over_regset_sections |
| 84 | (gdbarch, riscv_linux_iterate_over_regset_sections); |
| 85 | } |
| 86 | |
| 87 | /* Initialize RISC-V Linux target support. */ |
| 88 | |
| 89 | void |
| 90 | _initialize_riscv_linux_tdep (void) |
| 91 | { |
| 92 | gdbarch_register_osabi (bfd_arch_riscv, 0, GDB_OSABI_LINUX, |
| 93 | riscv_linux_init_abi); |
| 94 | } |