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Improve aarch64 native support some more

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This change introduces partial support for automating remote testing of
aarch64 binaries on Raspberry Pi and Apple Silicon.
This commit is contained in:
Justine Tunney 2023-06-04 08:19:45 -07:00
parent fc34ba2596
commit 4aa1d09b9e
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GPG key ID: BE714B4575D6E328
20 changed files with 185 additions and 82 deletions
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42
libc/runtime/vfork.S
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@ -67,13 +67,13 @@ vfork:
#endif
pop %rbp
#endif
mov %fs:0,%r9 # get thread information block
mov %fs:0,%r9 // get thread information block
#if SupportsWindows()
testb IsWindows()
jnz 6f # and we're lucky to have that
jnz 6f // and we're lucky to have that
#endif
#ifdef __SANITIZE_ADDRESS__
jmp 5f # TODO: asan and vfork don't mix?
jmp 5f // TODO: asan and vfork don't mix?
#endif
#if SupportsXnu()
testb IsXnu()
@ -81,10 +81,10 @@ vfork:
#endif
#if SupportsOpenbsd()
testb IsOpenbsd()
jnz 5f # fake vfork plus msyscall issues
jnz 5f // fake vfork plus msyscall issues
#endif
mov 0x3c(%r9),%r8d # avoid question of @vforksafe errno
pop %rsi # saves return address in a register
mov 0x3c(%r9),%r8d // avoid question of @vforksafe errno
pop %rsi // saves return address in a register
mov __NR_vfork(%rip),%eax
#if SupportsBsd()
clc
@ -95,10 +95,10 @@ vfork:
neg %rax
0:
#endif
push %rsi # note it happens twice in same page
push %rsi // note it happens twice in same page
cmp $-4095,%eax
jae systemfive_error
mov %r8d,0x3c(%r9) # restore errno
mov %r8d,0x3c(%r9) // restore errno
1: test %eax,%eax
jnz .Lpar
.Lchi: orb $TIB_FLAG_VFORKED,0x40(%r9)
@ -121,7 +121,7 @@ vfork:
mov %rsp,%rbp
push %r9
push %r9
xor %edi,%edi # dwCreationFlags
xor %edi,%edi // dwCreationFlags
call sys_fork_nt
pop %r9
pop %r9
@ -131,11 +131,31 @@ vfork:
#elif defined(__aarch64__)
mov x8,#220 // __NR_clone
adrp x0,__hostos
ldr w0,[x0,#:lo12:__hostos]
tbz x0,3,1f // bit 3 is xnu
b fork // which doesn't support vfork()
1: mov x8,#220 // __NR_clone
mov x0,#0x4111 // SIGCHLD | CLONE_VM | CLONE_VFORK
mov x1,#0
svc 0
.hidden _sysret
// if (!rc) {
// __get_tls()->tib_flags |= TIB_FLAG_VFORKED;
// } else {
// __get_tls()->tib_flags &= ~TIB_FLAG_VFORKED;
// }
sub x1,x28,#1152
ldr x2,[x1,0x40]
cbnz x0,2f
orr x2,x2,#TIB_FLAG_VFORKED
1: str x2,[x1,0x40]
b 3f
2: and x2,x2,#~TIB_FLAG_VFORKED
b 1b
// if (rc < 0) errno = -rc, rc = -1;
3: .hidden _sysret
b _sysret
#else