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//loongarch prologue for dynarec
//Save stuff, prepare stack and register
//called with pointer to emu as 1st parameter
//and address to jump to as 2nd parameter
.text
.align 4
.extern la64_lbt
.global la64_prolog
la64_prolog:
//save all 18 used register
addi.d $sp, $sp, -(8 * 19)
st.d $r1, $sp, (8 * 0) //save ra
st.d $r22, $sp, (8 * 1) //save fp
// save s0 - s8
st.d $r23, $sp, (8 * 2)
st.d $r24, $sp, (8 * 3)
st.d $r25, $sp, (8 * 4)
st.d $r26, $sp, (8 * 5)
st.d $r27, $sp, (8 * 6)
st.d $r28, $sp, (8 * 7)
st.d $r29, $sp, (8 * 8)
st.d $r30, $sp, (8 * 9)
st.d $r31, $sp, (8 * 10)
// save fs0 - fs7
fst.d $f24, $sp, (8 * 11)
fst.d $f25, $sp, (8 * 12)
fst.d $f26, $sp, (8 * 13)
fst.d $f27, $sp, (8 * 14)
fst.d $f28, $sp, (8 * 15)
fst.d $f29, $sp, (8 * 16)
fst.d $f30, $sp, (8 * 17)
fst.d $f31, $sp, (8 * 18)
// setup emu -> register
ld.d $r12, $r4, (8 * 0)
ld.d $r13, $r4, (8 * 1)
ld.d $r14, $r4, (8 * 2)
ld.d $r15, $r4, (8 * 3)
ld.d $r16, $r4, (8 * 4)
ld.d $r17, $r4, (8 * 5)
ld.d $r18, $r4, (8 * 6)
ld.d $r19, $r4, (8 * 7)
ld.d $r23, $r4, (8 * 8)
ld.d $r24, $r4, (8 * 9)
ld.d $r25, $r4, (8 * 10)
ld.d $r26, $r4, (8 * 11)
ld.d $r27, $r4, (8 * 12)
ld.d $r28, $r4, (8 * 13)
ld.d $r29, $r4, (8 * 14)
ld.d $r30, $r4, (8 * 15)
ld.d $r31, $r4, (8 * 16) // xFlags
ld.d $r20, $r4, (8 * 17) // xRIP
// spill xFlags to LBT.eflags
la.global $a6, la64_lbt
ldptr.d $a6, $a6, 0
beqz $a6, 1f
x86mtflag $r31, 0b111111
1:
// push sentinel onto the stack
st.d $r0, $sp, -16
st.d $r0, $sp, -8
addi.d $sp, $sp, -16
// save old sp into xSavedSP
addi.d $r22, $sp, 16
//jump to function
jirl $r0, $a1, 0
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