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RISC-V/Linux/native: Factor out target description determination

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In preparation for RISC-V/Linux `gdbserver' support factor out parts of
native target description determination code that can be shared between
the programs.

	gdb/
	* nat/riscv-linux-tdesc.h: New file.
	* nat/riscv-linux-tdesc.c: New file, taking code from...
	* riscv-linux-nat.c (riscv_linux_nat_target::read_description):
	... here.
	* configure.nat <linux> <riscv*>: Add nat/riscv-linux-tdesc.o to
	NATDEPFILES.
This commit is contained in:
Maciej W. Rozycki
2020-02-05 17:21:12 +00:00
parent af0ac53c45
commit f6480e7000
5 changed files with 124 additions and 49 deletions
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51
gdb/riscv-linux-nat.c
View File

@ -22,10 +22,11 @@
#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. */
@ -200,53 +201,7 @@ fill_fpregset (const struct regcache *regcache, prfpregset_t *fpregs,
const struct target_desc *
riscv_linux_nat_target::read_description ()
{
struct riscv_gdbarch_features features;
elf_fpregset_t regs;
int flen;
int tid;
/* Figuring out xlen is easy. */
features.xlen = sizeof (elf_greg_t);
tid = inferior_ptid.lwp ();
/* 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 = &regs;
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);
return riscv_linux_read_description (inferior_ptid.lwp ());
}
/* Fetch REGNUM (or all registers if REGNUM == -1) from the target