blob: faaa7c3a3b0f4542980842f513c645a40363b2ad (
plain)
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
|
.section .text.tinygo_scanCurrentStack
.global tinygo_scanCurrentStack
.type tinygo_scanCurrentStack, %function
tinygo_scanCurrentStack:
// Sources:
// * https://stackoverflow.com/questions/18024672/what-registers-are-preserved-through-a-linux-x86-64-function-call
// * https://godbolt.org/z/q7e8dn
// Save callee-saved registers.
pushl %ebx
pushl %esi
pushl %edi
pushl %ebp
// Scan the stack.
subl $8, %esp // adjust the stack before the call to maintain 16-byte alignment
pushl %esp
calll tinygo_scanstack
// Restore the stack pointer. Registers do not need to be restored as they
// were only pushed to be discoverable by the GC.
addl $28, %esp
retl
.section .text.tinygo_longjmp
.global tinygo_longjmp
tinygo_longjmp:
// Note: the code we jump to assumes eax is set to a non-zero value if we
// jump from here.
movl 4(%esp), %eax
movl 0(%eax), %esp // jumpSP
movl 4(%eax), %eax // jumpPC (stash in volatile register)
jmpl *%eax
|
