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gdb/gdbserver: share I386_LINUX_XSAVE_XCR0_OFFSET definition

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Share the definition of I386_LINUX_XSAVE_XCR0_OFFSET between GDB and
gdbserver.

This commit moves the definition into gdbsupport/x86-xstate.h, which
allows the #define to be shared.

There should be no user visible changes after this commit.

Approved-By: Felix Willgerodt <felix.willgerodt@intel.com>
This commit is contained in:
Andrew Burgess
2024-01-27 10:40:35 +00:00
parent 6b19a26ee1
commit 8a29222b85
3 changed files with 20 additions and 41 deletions
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20
gdbsupport/x86-xstate.h
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@@ -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 */