diff options
Diffstat (limited to 'gdb/nat')
| -rw-r--r-- | gdb/nat/riscv-linux-tdesc.c | 83 | ||||
| -rw-r--r-- | gdb/nat/riscv-linux-tdesc.h | 27 |
2 files changed, 110 insertions, 0 deletions
diff --git a/gdb/nat/riscv-linux-tdesc.c b/gdb/nat/riscv-linux-tdesc.c new file mode 100644 index 0000000..1b625cf --- /dev/null +++ b/gdb/nat/riscv-linux-tdesc.c @@ -0,0 +1,83 @@ +/* GNU/Linux/RISC-V native target description support for GDB. + Copyright (C) 2020 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 "gdbsupport/common-defs.h" + +#include "gdb_proc_service.h" +#include "arch/riscv.h" +#include "elf/common.h" +#include "nat/gdb_ptrace.h" +#include "nat/riscv-linux-tdesc.h" + +#include <sys/uio.h> + +/* Work around glibc header breakage causing ELF_NFPREG not to be usable. */ +#ifndef NFPREG +# define NFPREG 33 +#endif + +/* Determine XLEN and FLEN and return a corresponding target description. */ + +const struct target_desc * +riscv_linux_read_description (int tid) +{ + struct riscv_gdbarch_features features; + elf_fpregset_t regs; + int flen; + + /* Figuring out xlen is easy. */ + features.xlen = sizeof (elf_greg_t); + + /* Start with no f-registers. */ + features.flen = 0; + + /* How much worth of f-registers can we fetch if any? */ + for (flen = sizeof (regs.__f.__f[0]); ; flen *= 2) + { + size_t regset_size; + struct iovec iov; + + /* Regsets have a uniform slot size, so we count FSCR like + an FP data register. */ + regset_size = ELF_NFPREG * flen; + if (regset_size > sizeof (regs)) + break; + + iov.iov_base = ®s; + iov.iov_len = regset_size; + if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, + (PTRACE_TYPE_ARG3) &iov) == -1) + { + switch (errno) + { + case EINVAL: + continue; + case EIO: + break; + default: + perror_with_name (_("Couldn't get registers")); + break; + } + } + else + features.flen = flen; + break; + } + + return riscv_create_target_description (features); +} diff --git a/gdb/nat/riscv-linux-tdesc.h b/gdb/nat/riscv-linux-tdesc.h new file mode 100644 index 0000000..9b57a9e --- /dev/null +++ b/gdb/nat/riscv-linux-tdesc.h @@ -0,0 +1,27 @@ +/* GNU/Linux/RISC-V native target description support for GDB. + Copyright (C) 2020 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/>. */ + +#ifndef NAT_RISCV_LINUX_TDESC_H +#define NAT_RISCV_LINUX_TDESC_H + +struct target_desc; + +/* Return a target description for the LWP identified by TID. */ +const struct target_desc *riscv_linux_read_description (int tid); + +#endif /* NAT_RISCV_LINUX_TDESC_H */ |