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/*
Ugly: Kernel is caller-save, Myrddin
is callee-save. We need to preserve
registers before entering the kernel.
However, we also need SP to point to the
start of the arguments.
Luckily, the kernel doesn't touch our stack,
and we have 256 bytes of gap if we get a note.
*/
TEXT sys$syscall+0(SB),1,$0
MOVQ R11,-16(SP)
MOVQ R12,-24(SP)
MOVQ R13,-32(SP)
MOVQ R14,-40(SP)
MOVQ R15,-48(SP)
MOVQ BP,-56(SP)
MOVQ 8(SP),RARG
ADDQ $8,SP
MOVQ DI, RARG
SYSCALL
SUBQ $8,SP
MOVQ -16(SP),R11
MOVQ -24(SP),R12
MOVQ -32(SP),R13
MOVQ -40(SP),R14
MOVQ -48(SP),R15
MOVQ -56(SP),BP
RET
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