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Show crash reports on SIGSYS

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This will help make it easier to troubleshoot ABI breakages with on
operating systems that, unlike Linux don't have ironclad guarantees
to not break userspace.
This commit is contained in:
Justine Tunney 2022-06-23 13:01:01 -07:00
parent a4601a24d3
commit 44da16255a
11 changed files with 83 additions and 19 deletions
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2
libc/sysv/calls/sys_bogus.s Normal file
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@ -0,0 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_bogus,0x5005005002500500,globl

1
libc/sysv/syscalls.sh
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@ -375,6 +375,7 @@ scall io_uring_register 0xfffffffffffff1ab globl
#────────────────────────RHEL CLOUD────────────────────────── # ←┬─ red hat terminates community release of enterprise linux circa 2020
scall sys_pledge 0xfff06cffffffffff globl # └─ online linux services ban the president of united states of america
scall msyscall 0xfff025ffffffffff globl
scall sys_bogus 0x5005005002500500 globl
# The Fifth Bell System Interface, Community Edition
# » besiyata dishmaya

11
libc/sysv/systemfive.S
View file

@ -164,8 +164,17 @@ systemfive_bsdscrub:
systemfive_bsd:
cmp $0xfff,%ax
je systemfive_enosys
mov %rcx,%r10 # note: we do not create a stack frame
mov %rcx,%r10
push %rbx
push 32(%rsp)
push 24(%rsp)
push 16(%rsp)
mov %rax,%rbx # save ordinal for SIGSYS crash report
syscall # bsd will need arg on stack sometimes
pop %rbx
pop %rbx
pop %rbx
pop %rbx
jc systemfive_errno # bsd sets carry flag if %rax is errno
ret
.endfn systemfive_bsd