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gdb: Support XSAVE layouts for the current host in the Linux x86 targets.

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Note that this uses the CPUID instruction to determine the total size
of the XSAVE register set.  If there is a way to fetch the register set
size using ptrace that would probably be better.

Approved-By: Simon Marchi <simon.marchi@efficios.com>
This commit is contained in:
John Baldwin
2023-08-28 14:18:19 -07:00
parent b42405a159
commit 9848bf8375
5 changed files with 22 additions and 5 deletions
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6
gdb/amd64-linux-nat.c
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@@ -210,6 +210,7 @@ void
amd64_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
const i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
int tid;
/* GNU/Linux LWP ID's are process ID's. */
@@ -235,7 +236,7 @@ amd64_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum)
if (have_ptrace_getregset == TRIBOOL_TRUE)
{
char xstateregs[X86_XSTATE_MAX_SIZE];
char xstateregs[tdep->xsave_layout.sizeof_xsave];
struct iovec iov;
/* Pre-4.14 kernels have a bug (fixed by commit 0852b374173b
@@ -270,6 +271,7 @@ void
amd64_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
const i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
int tid;
/* GNU/Linux LWP ID's are process ID's. */
@@ -299,7 +301,7 @@ amd64_linux_nat_target::store_registers (struct regcache *regcache, int regnum)
if (have_ptrace_getregset == TRIBOOL_TRUE)
{
char xstateregs[X86_XSTATE_MAX_SIZE];
char xstateregs[tdep->xsave_layout.sizeof_xsave];
struct iovec iov;
iov.iov_base = xstateregs;