1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
// Do not reorder instructions to insert a branch delay slot.
// We know what we're doing, and will manually fill the branch delay slot.
.set noreorder
.section .text.tinygo_scanCurrentStack
.global tinygo_scanCurrentStack
.type tinygo_scanCurrentStack, %function
tinygo_scanCurrentStack:
// Push callee-saved registers onto the stack.
addiu $sp, $sp, -40
sw $ra, 36($sp)
sw $s8, 32($sp)
sw $s7, 28($sp)
sw $s6, 24($sp)
sw $s5, 20($sp)
sw $s4, 16($sp)
sw $s3, 12($sp)
sw $s2, 8($sp)
sw $s1, 4($sp)
sw $s0, ($sp)
// Scan the stack.
jal tinygo_scanstack
move $a0, $sp // in the branch delay slot
// Restore return address.
lw $ra, 36($sp)
// Restore stack state.
addiu $sp, $sp, 40
// Return to the caller.
jalr $ra
nop
.section .text.tinygo_longjmp
.global tinygo_longjmp
tinygo_longjmp:
// Note: the code we jump to assumes a0 is non-zero, which is already the
// case because that's the defer frame pointer.
lw $sp, 0($a0) // jumpSP
lw $a1, 4($a0) // jumpPC
jr $a1
nop
|
