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Ignore SIGSYS on BSD by default

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Justine Tunney 2022-11-03 09:32:12 -07:00
parent 179e048bba
commit 37d40e087f
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GPG key ID: BE714B4575D6E328
7 changed files with 48 additions and 16 deletions
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28
libc/sysv/systemfive.S
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@ -20,8 +20,11 @@
#include "libc/dce.h"
#include "libc/macros.internal.h"
#include "libc/nexgen32e/macros.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/consts/nr.h"
#define SIG_IGN 1
/* ▄▄▄
▄▄▄ ▀▓▓▒▄
▄▓▒▒░ ▀▓▒▒▒▄
@ -363,6 +366,31 @@ _init_systemfive_pid:
1: stosq
.endfn _init_systemfive_pid
#endif
#if SupportsBsd() && !defined(TINY)
_init_systemfive_sigsys:
testb IsBsd() # BSDs will trap SIGSYS!
jz 1f # We want ENOSYS instead
push %rdi # XNU removed some calls
push %rsi # in past, so this makes
xor %eax,%eax # troubleshooting easier
push %rax # but it's non-essential
push %rax
push %rax
push %rax
push %rax
push $SIG_IGN # sigaction_meta size 48
mov __NR_sigaction,%eax # mag
mov SIGSYS,%edi # sig
mov %rsp,%rsi # new
xor %edx,%edx # old
mov $8,%r10d # for linux
xor %r8d,%r8d # for netbsd
syscall
add $6*8,%rsp
pop %rsi
pop %rdi
1: .endfn _init_systemfive_sigsys
#endif
#if SupportsSystemv() && !defined(TINY)
_init_systemfive_syscall:
mov __NR_msyscall,%eax # syscall origin protect