diff options
Diffstat (limited to 'gdb/nat/x86-linux.h')
| -rw-r--r-- | gdb/nat/x86-linux.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gdb/nat/x86-linux.h b/gdb/nat/x86-linux.h index 15153ea..855a8d1 100644 --- a/gdb/nat/x86-linux.h +++ b/gdb/nat/x86-linux.h @@ -22,6 +22,26 @@ #include "nat/linux-nat.h" +/* Format of XSAVE extended state is: + struct + { + fxsave_bytes[0..463] + sw_usable_bytes[464..511] + xstate_hdr_bytes[512..575] + extended state regions (AVX, MPX, AVX512, PKRU, etc.) + }; + + Same memory layout will be used for the coredump NT_X86_XSTATE + representing the XSAVE extended state registers. + + The first 8 bytes of the sw_usable_bytes[464..467] is the OS enabled + extended state mask, which is the same as the extended control register + 0 (the XFEATURE_ENABLED_MASK register), XCR0. We can use this mask + together with the mask saved in the xstate_hdr_bytes to determine what + states the processor/OS supports and what state, used or initialized, + the process/thread is in. */ +#define I386_LINUX_XSAVE_XCR0_OFFSET 464 + /* Set whether our local mirror of LWP's debug registers has been changed since the values were last written to the thread. Nonzero indicates that a change has been made, zero indicates no change. */ |