[PATCH 3/5] RISC-V: Add linux target support.

Jim Wilson
2018-08-08T02:16:46Z

Add initial target support for riscv*-linux*.

gdb/
* riscv-linux-tdep.c: New file.
---
gdb/riscv-linux-tdep.c | 88 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 88 insertions(+)
create mode 100644 gdb/riscv-linux-tdep.c

diff --git a/gdb/riscv-linux-tdep.c b/gdb/riscv-linux-tdep.c
new file mode 100644
index 0000000000..c98dba70ca
--- /dev/null
+++ b/gdb/riscv-linux-tdep.c
@@ -0,0 +1,88 @@
+/* Target-dependent code for GNU/Linux on RISC-V 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 "riscv-tdep.h"
+#include "osabi.h"
+#include "glibc-tdep.h"
+#include "linux-tdep.h"
+#include "solib-svr4.h"
+#include "regset.h"
+
+static const struct regcache_map_entry riscv_linux_gregmap[] =
+{
+ { 1, RISCV_PC_REGNUM, 0 },
+ { 31, RISCV_RA_REGNUM, 0 }, /* x1 to x31 */
+ { 0 }
+};
+
+const struct regset riscv_linux_gregset =
+{
+ riscv_linux_gregmap, regcache_supply_regset, regcache_collect_regset
+};
+
+/* Define hook for core file support. */
+
+static void
+riscv_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
+ iterate_over_regset_sections_cb *cb,
+ void *cb_data,
+ const struct regcache *regcache)
+{
+ cb (".reg", (32 * riscv_isa_xlen (gdbarch)),
+ &riscv_linux_gregset, NULL, cb_data);
+
+ /* TODO: Add FP register support. */
+}
+
+/* Initialize RISC-V Linux ABI info. */
+
+static void
+riscv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ linux_init_abi (info, gdbarch);
+
+ set_gdbarch_software_single_step (gdbarch, riscv_software_single_step);
+
+ set_solib_svr4_fetch_link_map_offsets (gdbarch,
+ (riscv_isa_xlen (gdbarch) == 4
+ ? svr4_ilp32_fetch_link_map_offsets
+ : svr4_lp64_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, riscv_linux_iterate_over_regset_sections);
+}
+
+/* Initialize RISC-V Linux target support. */
+
+void
+_initialize_riscv_linux_tdep (void)
+{
+ gdbarch_register_osabi (bfd_arch_riscv, 0, GDB_OSABI_LINUX,
+ riscv_linux_init_abi);
+}
--
2.17.1