diff options
Diffstat (limited to 'gdbsupport')
| -rw-r--r-- | gdbsupport/x86-xstate.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/gdbsupport/x86-xstate.h b/gdbsupport/x86-xstate.h index 89c1143..11b3754 100644 --- a/gdbsupport/x86-xstate.h +++ b/gdbsupport/x86-xstate.h @@ -120,4 +120,24 @@ constexpr bool operator!= (const x86_xsave_layout &lhs, #define I387_MXCSR_INIT_VAL 0x1f80 +/* 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 + #endif /* COMMON_X86_XSTATE_H */ |