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commit 538aa8cbbcc6cb4dad48fd6187a63978046ce51d Author: raiden00pl <[email protected]> AuthorDate: Mon Aug 24 08:56:37 2026 +0200 arch/x86_64: fix AP initial stack alignment The AP boot path masked RSP with ~XCPTCONTEXT_SIZE, which just clears whichever bits happen to be set in the size (0x340 -> mask 0xfffffcbf). That drops RSP by an arbitrary amount and only guarantees 16-byte alignment, while the XSAVE area in the context needs 64. Mask with ~(XCPTCONTEXT_ALIGN - 1) instead. Signed-off-by: raiden00pl <[email protected]> Assisted-by: Claude Code --- arch/x86_64/src/intel64/intel64_head.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86_64/src/intel64/intel64_head.S b/arch/x86_64/src/intel64/intel64_head.S index b9cc9639d3c..333640c200e 100644 --- a/arch/x86_64/src/intel64/intel64_head.S +++ b/arch/x86_64/src/intel64/intel64_head.S @@ -420,7 +420,7 @@ ap_start: /* Move initial RSP below IDLE TCB regs */ sub $XCPTCONTEXT_SIZE, %rsp - and $(~XCPTCONTEXT_SIZE), %rsp + and $(~(XCPTCONTEXT_ALIGN - 1)), %rsp /* Jump to ap_start routine */ movabs $x86_64_ap_boot, %rbx
