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| author | Konstantin Belousov <kib@FreeBSD.org> | 2026-07-30 09:45:51 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2026-07-30 17:08:24 +0000 |
| commit | 72952bf6a307391e127d3ab4a6f073664ce62d89 (patch) | |
| tree | d21893c283ad9b6b299346fec8aee3cd7565bdab | |
| parent | cef05c5a62ba63eda222eed083972bfaa1449ac2 (diff) | |
amd64: try to fix the build with old clang that does not know about FRED
Reported by: jhb
Reviewed by: jhb, jrtc27
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D58550
| -rw-r--r-- | sys/amd64/amd64/exception.S | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sys/amd64/amd64/exception.S b/sys/amd64/amd64/exception.S index 6dfb8a431fe7..458a7c405793 100644 --- a/sys/amd64/amd64/exception.S +++ b/sys/amd64/amd64/exception.S @@ -1403,6 +1403,23 @@ gsbase_load_fault: movq $0,PCB_GSBASE(%r8) jmp doreti +#if defined(__clang__) && (__clang_major__ <= 18) + .macro lkgs reg + .if \reg != %ax + .err "Only %ax is supported" + .endif + .byte 0xf2, 0x0f, 0x00, 0xf0 + .endm + + .macro eretu + .byte 0xf3, 0x0f, 0x01, 0xca + .endm + + .macro erets + .byte 0xf2, 0x0f, 0x01, 0xca + .endm +#endif + /* * FRED guarantees that on entry, %rflags is set to '2', which in * particular means that interrupts are disabled, and DF/AC are clear. |