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/* 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"
/* 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 riscv_linux_gregmap[] =
{
{ 1, RISCV_PC_REGNUM, 0 },
{ 31, RISCV_RA_REGNUM, 0 }, /* x1 to x31 */
{ 0 }
};
/* Define the general register regset. */
static 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)), (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);
}
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