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Get garbage collector working on aarch64

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Garbage collection will now happen on arm64 when a function returns,
rather than kicking the can down the road to when the process exits.
This change also does some code cleanup and incorporates suggestions
This commit is contained in:
Justine Tunney 2023-06-07 03:34:45 -07:00
parent 9793d3524f
commit 01fd655097
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GPG key ID: BE714B4575D6E328
16 changed files with 144 additions and 323 deletions
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22
libc/nexgen32e/gclongjmp.S
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@ -36,27 +36,27 @@ _gclongjmp:
#ifdef __x86_64__
push %rbp
mov %rsp,%rbp
mov %fs:0,%r12 # __get_tls()
mov 0x18(%r12),%r12 # Tls::garbages
mov %fs:0,%r12 // __get_tls()
mov 0x18(%r12),%r12 // Tls::garbages
test %r12,%r12
jz 0f
movl (%r12),%r13d # garbages.i
movl (%r12),%r13d // garbages.i
test %r13d,%r13d
jnz .L.unwind.destructors
0: jmp longjmp
.L.unwind.destructors:
push %rdi
push %rsi
mov 8(%r12),%r14 # garbages.p
mov (%rdi),%r15 # jmp_buf[0] is new %rsp
shl $5,%r13 # log2(sizeof(struct Garbage))
1: sub $32,%r13 # 𝑖--
mov 8(%r12),%r14 // garbages.p
mov (%rdi),%r15 // jmp_buf[0] is new %rsp
shl $5,%r13 // log2(sizeof(struct Garbage))
1: sub $32,%r13 // 𝑖--
js 2f
cmp (%r14,%r13),%r15 # new %rsp > garbages.p[𝑖].frame
cmp (%r14,%r13),%r15 // new %rsp > garbages.p[𝑖].frame
jbe 2f
mov 16(%r14,%r13),%rdi # garbages.p[𝑖].arg
callq *8(%r14,%r13) # garbages.p[𝑖].fn
decl (%r12) # garbages.i--
mov 16(%r14,%r13),%rdi // garbages.p[𝑖].arg
callq *8(%r14,%r13) // garbages.p[𝑖].fn
decl (%r12) // garbages.i--
jmp 1b
2: pop %rsi
pop %rdi