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Remove old stack code and improve dirstream

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Justine Tunney 2023-08-16 07:54:40 -07:00
parent 74caabb823
commit dc6c67256f
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GPG key ID: BE714B4575D6E328
61 changed files with 463 additions and 595 deletions
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60
libc/runtime/cosmo.S
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@ -123,66 +123,6 @@ cosmo: push %rbp
pop %rdi
.init.end 304,_init_tls
#if !IsTiny()
// Creates deterministically addressed stack we can use
//
// This helps debugging be more comprehensible, because
// when diagnosing low-level problems when error report
// isn't working, sometimes numbers are all you have to
// go on, and we can't use them if kernel hardening has
// configured that meaningful data to be randomized.
//
// Having deterministic addresses is also key to ensure
// builds, execution, and other things are reproducible
.init.start 304,_init_stack
testb IsWindows()
jnz 9f
testb IsMetal()
jnz 9f
push %rdi
push %rsi
// allocate stack
movabs $ape_stack_vaddr,%rdi
mov $ape_stack_memsz,%esi
mov $ape_stack_prot,%edx
mov $MAP_STACK,%ecx
or MAP_ANONYMOUS,%ecx
or $-1,%r8
xor %r9d,%r9d
push %rsi
push %rsi
call mmap
pop %r8
pop %r8
pop %rsi
pop %rdi
cmp $-1,%rax
je 9f
// switch stacks
//
// we subtract 8 because the openbsd kernel always checks rsp
// is on a MAP_STACK interval non-inclusively of stack + size
leave
pop %rcx // return address
sub $8,%r8d // openbsd:stackbound
lea (%rax,%r8),%rsp
mov $ape_stack_align,%eax
neg %rax
and %rax,%rsp
push %rcx
push %rbp
mov %rsp,%rbp
9: nop
.init.end 304,_init_stack
.weak ape_stack_prot
.weak ape_stack_vaddr
.weak ape_stack_memsz
.weak ape_stack_align
#endif
#if IsAsan()
.init.start 305,_init_symbols
push %rdi