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Support the fs_base and gs_base registers on FreeBSD/amd64 native processes.

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Use ptrace operations to fetch and store the fs_base and gs_base registers
for FreeBSD/amd64 processes.  Note that FreeBSD does not currently store the
value of these registers in core dumps, so these registers are only
available when inspecting a running process.

gdb/ChangeLog:

	* amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use
	PT_GETFSBASE and PT_GETGSBASE.
	(amd64bsd_store_inferior_registers): Use PT_SETFSBASE and
	PT_SETGSBASE.
This commit is contained in:
John Baldwin 2017-06-26 18:18:19 -07:00
parent 48aeef91c2
commit 0aa37b654c
2 changed files with 61 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2017-07-11 John Baldwin <jhb@FreeBSD.org>
* amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use
PT_GETFSBASE and PT_GETGSBASE.
(amd64bsd_store_inferior_registers): Use PT_SETFSBASE and
PT_SETGSBASE.
2017-07-11 John Baldwin <jhb@FreeBSD.org>
* features/Makefile (amd64.dat, amd64-avx.dat, amd64-mpx.dat)

54
gdb/amd64-bsd-nat.c
View File

@ -57,6 +57,33 @@ amd64bsd_fetch_inferior_registers (struct target_ops *ops,
return;
}
#ifdef PT_GETFSBASE
if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
{
register_t base;
if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
perror_with_name (_("Couldn't get segment register fs_base"));
regcache_raw_supply (regcache, AMD64_FSBASE_REGNUM, &base);
if (regnum != -1)
return;
}
#endif
#ifdef PT_GETGSBASE
if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
{
register_t base;
if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
perror_with_name (_("Couldn't get segment register gs_base"));
regcache_raw_supply (regcache, AMD64_GSBASE_REGNUM, &base);
if (regnum != -1)
return;
}
#endif
if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
{
struct fpreg fpregs;
@ -108,6 +135,33 @@ amd64bsd_store_inferior_registers (struct target_ops *ops,
return;
}
#ifdef PT_SETFSBASE
if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
{
register_t base;
regcache_raw_collect (regcache, AMD64_FSBASE_REGNUM, &base);
if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
perror_with_name (_("Couldn't write segment register fs_base"));
if (regnum != -1)
return;
}
#endif
#ifdef PT_SETGSBASE
if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
{
register_t base;
regcache_raw_collect (regcache, AMD64_GSBASE_REGNUM, &base);
if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
perror_with_name (_("Couldn't write segment register gs_base"));
if (regnum != -1)
return;
}
#endif
if (regnum == -1 || !amd64_native_gregset_supplies_p (gdbarch, regnum))
{
struct fpreg fpregs;