/* Native-dependent code for GNU/Linux RISC-V.
- Copyright (C) 2018 Free Software Foundation, Inc.
+ Copyright (C) 2018-2022 Free Software Foundation, Inc.
This file is part of GDB.
#include "linux-nat.h"
#include "riscv-tdep.h"
#include "inferior.h"
-#include "target-descriptions.h"
#include "elf/common.h"
+#include "nat/riscv-linux-tdesc.h"
+
#include <sys/ptrace.h>
+/* Work around glibc header breakage causing ELF_NFPREG not to be usable. */
+#ifndef NFPREG
+# define NFPREG 33
+#endif
+
/* RISC-V Linux native additions to the default linux support. */
class riscv_linux_nat_target final : public linux_nat_target
supply_fpregset_regnum (struct regcache *regcache, const prfpregset_t *fpregs,
int regnum)
{
+ int flen = register_size (regcache->arch (), RISCV_FIRST_FP_REGNUM);
+ union
+ {
+ const prfpregset_t *fpregs;
+ const gdb_byte *buf;
+ }
+ fpbuf = { .fpregs = fpregs };
int i;
if (regnum == -1)
{
/* We only support the FP registers and FCSR here. */
- for (i = RISCV_FIRST_FP_REGNUM; i <= RISCV_LAST_FP_REGNUM; i++)
- regcache->raw_supply (i, &fpregs->__d.__f[i - RISCV_FIRST_FP_REGNUM]);
+ for (i = RISCV_FIRST_FP_REGNUM;
+ i <= RISCV_LAST_FP_REGNUM;
+ i++, fpbuf.buf += flen)
+ regcache->raw_supply (i, fpbuf.buf);
- regcache->raw_supply (RISCV_CSR_FCSR_REGNUM, &fpregs->__d.__fcsr);
+ regcache->raw_supply (RISCV_CSR_FCSR_REGNUM, fpbuf.buf);
}
else if (regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
- regcache->raw_supply (regnum,
- &fpregs->__d.__f[regnum - RISCV_FIRST_FP_REGNUM]);
+ {
+ fpbuf.buf += flen * (regnum - RISCV_FIRST_FP_REGNUM);
+ regcache->raw_supply (regnum, fpbuf.buf);
+ }
else if (regnum == RISCV_CSR_FCSR_REGNUM)
- regcache->raw_supply (RISCV_CSR_FCSR_REGNUM, &fpregs->__d.__fcsr);
+ {
+ fpbuf.buf += flen * (RISCV_LAST_FP_REGNUM - RISCV_FIRST_FP_REGNUM + 1);
+ regcache->raw_supply (RISCV_CSR_FCSR_REGNUM, fpbuf.buf);
+ }
}
/* Copy all floating point registers from regset FPREGS into REGCACHE. */
fill_fpregset (const struct regcache *regcache, prfpregset_t *fpregs,
int regnum)
{
+ int flen = register_size (regcache->arch (), RISCV_FIRST_FP_REGNUM);
+ union
+ {
+ prfpregset_t *fpregs;
+ gdb_byte *buf;
+ }
+ fpbuf = { .fpregs = fpregs };
+ int i;
+
if (regnum == -1)
{
/* We only support the FP registers and FCSR here. */
- for (int i = RISCV_FIRST_FP_REGNUM; i <= RISCV_LAST_FP_REGNUM; i++)
- regcache->raw_collect (i, &fpregs->__d.__f[i - RISCV_FIRST_FP_REGNUM]);
+ for (i = RISCV_FIRST_FP_REGNUM;
+ i <= RISCV_LAST_FP_REGNUM;
+ i++, fpbuf.buf += flen)
+ regcache->raw_collect (i, fpbuf.buf);
- regcache->raw_collect (RISCV_CSR_FCSR_REGNUM, &fpregs->__d.__fcsr);
+ regcache->raw_collect (RISCV_CSR_FCSR_REGNUM, fpbuf.buf);
}
else if (regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
- regcache->raw_collect (regnum,
- &fpregs->__d.__f[regnum - RISCV_FIRST_FP_REGNUM]);
+ {
+ fpbuf.buf += flen * (regnum - RISCV_FIRST_FP_REGNUM);
+ regcache->raw_collect (regnum, fpbuf.buf);
+ }
else if (regnum == RISCV_CSR_FCSR_REGNUM)
- regcache->raw_collect (RISCV_CSR_FCSR_REGNUM, &fpregs->__d.__fcsr);
+ {
+ fpbuf.buf += flen * (RISCV_LAST_FP_REGNUM - RISCV_FIRST_FP_REGNUM + 1);
+ regcache->raw_collect (RISCV_CSR_FCSR_REGNUM, fpbuf.buf);
+ }
}
/* Return a target description for the current target. */
const struct target_desc *
riscv_linux_nat_target::read_description ()
{
- struct riscv_gdbarch_features features;
- struct iovec iov;
- elf_fpregset_t regs;
- int tid;
-
- /* Figuring out xlen is easy. */
- features.xlen = sizeof (elf_greg_t);
-
- tid = inferior_ptid.lwp ();
-
- iov.iov_base = ®s;
- iov.iov_len = sizeof (regs);
-
- /* Can we fetch the f-registers? */
- if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET,
- (PTRACE_TYPE_ARG3) &iov) == -1)
- features.flen = 0; /* No f-registers. */
- else
- {
- /* TODO: We need a way to figure out the actual length of the
- f-registers. We could have 64-bit x-registers, with 32-bit
- f-registers. For now, just assumed xlen and flen match. */
- features.flen = features.xlen;
- }
-
- return riscv_create_target_description (features);
+ const struct riscv_gdbarch_features features
+ = riscv_linux_read_features (inferior_ptid.pid ());
+ return riscv_lookup_target_description (features);
}
/* Fetch REGNUM (or all registers if REGNUM == -1) from the target
elf_fpregset_t regs;
iov.iov_base = ®s;
- iov.iov_len = sizeof (regs);
+ iov.iov_len = ELF_NFPREG * register_size (regcache->arch (),
+ RISCV_FIRST_FP_REGNUM);
+ gdb_assert (iov.iov_len <= sizeof (regs));
if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET,
(PTRACE_TYPE_ARG3) &iov) == -1)
elf_fpregset_t regs;
iov.iov_base = ®s;
- iov.iov_len = sizeof (regs);
+ iov.iov_len = ELF_NFPREG * register_size (regcache->arch (),
+ RISCV_FIRST_FP_REGNUM);
+ gdb_assert (iov.iov_len <= sizeof (regs));
if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET,
(PTRACE_TYPE_ARG3) &iov) == -1)
/* Initialize RISC-V Linux native support. */
+void _initialize_riscv_linux_nat ();
void
-_initialize_riscv_linux_nat (void)
+_initialize_riscv_linux_nat ()
{
/* Register the target. */
linux_target = &the_riscv_linux_nat_target;