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Fix regression in _gclongjmp()

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This commit is contained in:
Justine Tunney 2021-08-19 08:30:00 -07:00
parent da45c7c80b
commit 65f32fad52
12 changed files with 225 additions and 25 deletions
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24
libc/nexgen32e/gclongjmp.S
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@ -30,29 +30,27 @@
// @see examples/ctrlc.c
// @noreturn
_gclongjmp:
.leafprologue
push %rbp
mov %rsp,%rbp
.profilable
.weak __garbage
lea __garbage(%rip),%r12
test %r12,%r12
mov (%r12),%r13 # garbage.i
test %r13,%r13
jnz .L.unwind.destructors
0: jmp longjmp
.L.unwind.destructors:
push %rdi
push %rsi
mov (%r12),%r13 # garbage.i
mov 16(%r12),%r14 # garbage.p
mov (%rdi),%r15 # jmp_buf[0] is new %rsp
shl $5,%r13
1: test %r13,%r13
jz 2f
sub $32,%r13
cmp (%r14,%r13),%r15
ja 2f
mov 8(%r14,%r13),%rax # garbage.p[𝑖].fn
shl $5,%r13 # log2(sizeof(struct Garbage))
1: sub $32,%r13 # 𝑖--
js 2f
cmp (%r14,%r13),%r15 # new %rsp > garbage.p[𝑖].frame
jbe 2f
mov 16(%r14,%r13),%rdi # garbage.p[𝑖].arg
call *%rax
decq (%r12)
callq *8(%r14,%r13) # garbage.p[𝑖].fn
decq (%r12) # garbage.i--
jmp 1b
2: pop %rsi
pop %rdi