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Implement support for POSIX thread cancellations

Browse source 
This change makes some miracle modifications to the System Five system
call support, which lets us have safe, correct, and atomic handling of
thread cancellations. It all turned out to be cheaper than anticipated
because it wasn't necessary to modify the system call veneers. We were
able to encode the cancellability of each system call into the magnums
found in libc/sysv/syscalls.sh. Since cancellations are so waq, we are
also supporting a lovely Musl Libc mask feature for raising ECANCELED.
This commit is contained in:
Justine Tunney 2022-11-04 01:04:43 -07:00
parent 37d40e087f
commit 2278327eba
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
145 changed files with 715 additions and 265 deletions
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2
libc/sysv/calls/__sys_accept.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall __sys_accept,0x01e01e21d201e02b,globl,hidden
.scall __sys_accept,0x81e81ea1d281e82b,globl,hidden

2
libc/sysv/calls/__sys_accept4.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall __sys_accept4,0xfff05d21dffff120,globl,hidden
.scall __sys_accept4,0xfff85da1dffff920,globl,hidden

2
libc/sysv/calls/__sys_connect.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall __sys_connect,0x062062062206202a,globl,hidden
.scall __sys_connect,0x862862862286282a,globl,hidden

2
libc/sysv/calls/__sys_fcntl_cp.s Normal file
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@ -0,0 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall __sys_fcntl_cp,0x85c85c85c285c848,globl,hidden

2
libc/sysv/calls/__sys_openat.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall __sys_openat,0x1d41411f321cf101,globl,hidden
.scall __sys_openat,0x9d49419f329cf901,globl,hidden

2
libc/sysv/calls/__sys_wait4.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall __sys_wait4,0x1c100b007200703d,globl,hidden
.scall __sys_wait4,0x9c180b807280783d,globl,hidden

2
libc/sysv/calls/posix_fallocate.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall posix_fallocate,0x1dffff212fffffff,globl,hidden
.scall posix_fallocate,0x9dffffa12fffffff,globl,hidden

2
libc/sysv/calls/sys_clock_nanosleep.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_clock_nanosleep,0x1ddfff0f4ffff0e6,globl,hidden
.scall sys_clock_nanosleep,0x9ddfff8f4ffff8e6,globl,hidden

2
libc/sysv/calls/sys_epoll_wait.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_epoll_wait,0xfffffffffffff0e8,globl,hidden
.scall sys_epoll_wait,0xfffffffffffff8e8,globl,hidden

2
libc/sysv/calls/sys_fallocate.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_fallocate,0xfffffffffffff11d,globl
.scall sys_fallocate,0xfffffffffffff91d,globl

2
libc/sysv/calls/sys_fdatasync.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_fdatasync,0x0f105f22620bb04b,globl,hidden
.scall sys_fdatasync,0x8f185fa2628bb84b,globl,hidden

2
libc/sysv/calls/sys_flock.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_flock,0x0830830832083049,globl,hidden
.scall sys_flock,0x8838838832883849,globl,hidden

2
libc/sysv/calls/sys_fstatfs.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_fstatfs,0x09e04022c215a08a,globl,hidden
.scall sys_fstatfs,0x89e840a2c295a88a,globl,hidden

2
libc/sysv/calls/sys_fsync.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_fsync,0x05f05f05f205f04a,globl,hidden
.scall sys_fsync,0x85f85f85f285f84a,globl,hidden

2
libc/sysv/calls/sys_ftruncate.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_ftruncate,0x0c90c91e020c904d,globl,hidden
.scall sys_ftruncate,0x8c98c99e028c984d,globl,hidden

2
libc/sysv/calls/sys_getrandom.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_getrandom,0xfff00723321f413e,globl,hidden
.scall sys_getrandom,0xfff807a3329f493e,globl,hidden

2
libc/sysv/calls/sys_ioctl_cp.s Normal file
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@ -0,0 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_ioctl_cp,0x8368368362836810,globl,hidden

2
libc/sysv/calls/sys_msgrcv.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_msgrcv,0x0e30e30e32105046,globl
.scall sys_msgrcv,0x8e38e38e32905846,globl

2
libc/sysv/calls/sys_msgsnd.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_msgsnd,0x0e20e20e22104045,globl
.scall sys_msgsnd,0x8e28e28e22904845,globl

2
libc/sysv/calls/sys_msync.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_msync,0x115100041204101a,globl,hidden
.scall sys_msync,0x915900841284181a,globl,hidden

2
libc/sysv/calls/sys_nanosleep.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_nanosleep,0x1ae05b0f0ffff023,globl,hidden
.scall sys_nanosleep,0x9ae85b8f0ffff823,globl,hidden

2
libc/sysv/calls/sys_open.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_open,0x0050050052005002,globl,hidden
.scall sys_open,0x8058058052805802,globl,hidden

2
libc/sysv/calls/sys_poll.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_poll,0x0d10fc0d120e6007,globl,hidden
.scall sys_poll,0x8d18fc8d128e6807,globl,hidden

2
libc/sysv/calls/sys_ppoll.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_ppoll,0xfff06d221ffff10f,globl,hidden
.scall sys_ppoll,0xfff86da21ffff90f,globl,hidden

2
libc/sysv/calls/sys_pread.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_pread,0x0ad0ad1db2099011,globl,hidden
.scall sys_pread,0x8ad8ad9db2899811,globl,hidden

2
libc/sysv/calls/sys_preadv.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_preadv,0x12110b121221c127,globl,hidden
.scall sys_preadv,0x92190b9212a1c927,globl,hidden

2
libc/sysv/calls/sys_pselect.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_pselect,0x1b406e20a218a10e,globl,hidden
.scall sys_pselect,0x9b486ea0a298a90e,globl,hidden

2
libc/sysv/calls/sys_pwrite.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_pwrite,0x0ae0ae1dc209a012,globl,hidden
.scall sys_pwrite,0x8ae8ae9dc289a812,globl,hidden

2
libc/sysv/calls/sys_pwritev.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_pwritev,0x12210c122221d128,globl,hidden
.scall sys_pwritev,0x92290c9222a1d928,globl,hidden

2
libc/sysv/calls/sys_read.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_read,0x0030030032003000,globl,hidden
.scall sys_read,0x8038038032803800,globl,hidden

2
libc/sysv/calls/sys_readv.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_readv,0x0780780782078013,globl,hidden
.scall sys_readv,0x8788788782878813,globl,hidden

2
libc/sysv/calls/sys_recvfrom.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_recvfrom,0x01d01d01d201d02d,globl,hidden
.scall sys_recvfrom,0x81d81d81d281d82d,globl,hidden

2
libc/sysv/calls/sys_recvmsg.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_recvmsg,0x01b01b01b201b02f,globl,hidden
.scall sys_recvmsg,0x81b81b81b281b82f,globl,hidden

2
libc/sysv/calls/sys_select.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_select,0x1a104705d205d017,globl,hidden
.scall sys_select,0x9a184785d285d817,globl,hidden

2
libc/sysv/calls/sys_sendmsg.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_sendmsg,0x01c01c01c201c02e,globl,hidden
.scall sys_sendmsg,0x81c81c81c281c82e,globl,hidden

2
libc/sysv/calls/sys_sendto.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_sendto,0x085085085208502c,globl,hidden
.scall sys_sendto,0x885885885288582c,globl,hidden

2
libc/sysv/calls/sys_sigsuspend.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_sigsuspend,0x12606f155206f082,globl,hidden
.scall sys_sigsuspend,0x92686f955286f882,globl,hidden

2
libc/sysv/calls/sys_sigtimedwait.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_sigtimedwait,0x1affff159ffff080,globl,hidden
.scall sys_sigtimedwait,0x9affff959ffff880,globl,hidden

2
libc/sysv/calls/sys_statfs.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_statfs,0x09d03f22b2159089,globl,hidden
.scall sys_statfs,0x89d83fa2b2959889,globl,hidden

2
libc/sysv/calls/sys_truncate.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_truncate,0x0c80c81df20c804c,globl,hidden
.scall sys_truncate,0x8c88c89df28c884c,globl,hidden

2
libc/sysv/calls/sys_waitid.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_waitid,0xfffffffff20ad0f7,globl
.scall sys_waitid,0xfffffffff28ad8f7,globl

2
libc/sysv/calls/sys_write.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_write,0x0040040042004001,globl,hidden
.scall sys_write,0x8048048042804801,globl,hidden

2
libc/sysv/calls/sys_writev.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_writev,0x0790790792079014,globl,hidden
.scall sys_writev,0x8798798792879814,globl,hidden

3
libc/sysv/consts.sh
View file

@ -168,9 +168,10 @@ syscon sig SIGPROF 27 27 27 27 27 27 # profiling timer expired;
syscon sig SIGWINCH 28 28 28 28 28 28 # terminal resized; unix consensus & faked on nt
syscon sig SIGIO 29 23 23 23 23 29 # bsd consensus
syscon sig SIGSYS 31 12 12 12 12 31 # wut; bsd consensus
syscon sig SIGINFO 0 29 29 29 29 0 # bsd consensus
syscon sig SIGEMT 0 7 7 7 7 0 # not implemented in most community editions of system five; consider doing this using SIGUSR1 or SIGUSR2 instead
syscon sig SIGPWR 30 30 30 30 32 30 # not implemented in most community editions of system five; consider doing this using SIGUSR1 or SIGUSR2 instead
syscon sig SIGINFO 0 29 29 29 29 0 # bsd consensus
syscon sig SIGCANCEL 32 7 65 7 33 32 # SIGRTMIN+0; faked as SIGEMT on XNU and OpenBSD
syscon sig SIGRTMIN 32 0 65 0 33 32
syscon sig SIGRTMAX 64 0 126 0 63 64
syscon compat SIGPOLL 29 23 23 23 23 29 # same as SIGIO

2
libc/sysv/consts/EDEVERR.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/consts/syscon.internal.inc"
.syscon errno,EDEVERR,311,83,311,311,311,0
.syscon errno,EDEVERR,311,83,311,311,311,483

2
libc/sysv/consts/SIGCANCEL.s Normal file
View file

@ -0,0 +1,2 @@
.include "o/libc/sysv/consts/syscon.internal.inc"
.syscon sig,SIGCANCEL,32,7,65,7,33,32

2
libc/sysv/consts/sig.h
View file

@ -7,6 +7,7 @@ COSMOPOLITAN_C_START_
extern const int SIGABRT;
extern const int SIGALRM;
extern const int SIGBUS;
extern const int SIGCANCEL;
extern const int SIGCHLD;
extern const int SIGCONT;
extern const int SIGEMT;
@ -72,6 +73,7 @@ COSMOPOLITAN_C_END_
#define SIGXFSZ LITERALLY(25)
#define SIGBUS SYMBOLIC(SIGBUS)
#define SIGCANCEL SYMBOLIC(SIGCANCEL)
#define SIGCHLD SYMBOLIC(SIGCHLD)
#define SIGCONT SYMBOLIC(SIGCONT)
#define SIGEMT SYMBOLIC(SIGEMT)

98
libc/sysv/syscalls.sh
View file

@ -22,43 +22,44 @@ dir=libc/sysv/calls
# The Fifth Bell System Interface, Community Edition ┌─────────────────────────┐
# » so many numbers │ legend │
# ├─────────────────────────┤
# GNU/Systemd┐ │ ffff │ unavailable │
# 2.6.18+│ │ sys_ │ wrapped │
# Mac OS X┐ │ │ __sys_ │ wrapped twice │
# 15.6+│ │ └─────────────────────────┘
# FreeBSD┐ │ │
# 12+│ ┌─│──│── XnuClass{1:Mach,2:Unix}
# OpenBSD┐ │ │ │ │
# GNU/Systemd┐ │ fff │ unavailable │
# 2.6.18+│ │ 800 │ cancellable │
# Mac OS X┐ │ │ sys_ │ wrapped │
# 15.6+│ │ │ __sys_ │ wrapped twice │
# FreeBSD┐ │ │ └─────────────────────────┘
# 12+│ │ │
# OpenBSD┐ │ ┌─│──│── XnuClass{1:Mach,2:Unix}
# 6.4+│ │ │ │ │
# NetBSD┐ │ │ │ │ │
# 9.1+│ │ │ │ │ │
# Symbol ┌┴┐┌┴┐┌┴┐│┬┴┐┌┴┐ Directives & Commentary
scall sys_exit 0x00100100120010e7 globl hidden # a.k.a. exit_group
scall sys_read 0x0030030032003000 globl hidden
scall sys_write 0x0040040042004001 globl hidden
scall sys_open 0x0050050052005002 globl hidden
scall sys_read 0x8038038032803800 globl hidden
scall sys_write 0x8048048042804801 globl hidden
scall sys_open 0x8058058052805802 globl hidden
scall sys_close 0x0060060062006003 globl hidden
scall __sys_stat 0x1b7026fff2152004 globl hidden # FreeBSD 11→12 fumble; use sys_fstatat(); blocked on Android
scall __sys_fstat 0x1b80352272153005 globl hidden # needs __stat2linux()
scall __sys_lstat 0x1b90280282154006 globl hidden # needs __stat2linux(); blocked on Android
scall sys_poll 0x0d10fc0d120e6007 globl hidden
scall sys_ppoll 0xfff06d221ffff10f globl hidden # consider INTON/INTOFF tutorial in examples/unbourne.c
scall sys_poll 0x8d18fc8d128e6807 globl hidden
scall sys_ppoll 0xfff86da21ffff90f globl hidden # consider INTON/INTOFF tutorial in examples/unbourne.c
scall sys_lseek 0x0c70c71de20c7008 globl hidden # netbsd+openbsd:evilpad
scall __sys_mmap 0x0c50c51dd20c5009 globl hidden # netbsd+openbsd:pad
scall sys_msync 0x115100041204101a globl hidden
scall sys_msync 0x915900841284181a globl hidden
scall sys_mprotect 0x04a04a04a204a00a globl hidden
scall __sys_munmap 0x049049049204900b globl hidden
scall sys_sigaction 0x15402e1a0202e00d globl hidden # rt_sigaction on Lunix; __sigaction_sigtramp() on NetBSD
scall __sys_sigprocmask 0x125030154214900e globl hidden # a.k.a. rt_sigprocmask, openbsd:byvalue, a.k.a. pthread_sigmask
scall sys_ioctl 0x0360360362036010 globl hidden
scall sys_pread 0x0ad0ad1db2099011 globl hidden # a.k.a. pread64; netbsd+openbsd:pad
scall sys_pwrite 0x0ae0ae1dc209a012 globl hidden # a.k.a. pwrite64; netbsd+openbsd:pad
scall sys_readv 0x0780780782078013 globl hidden
scall sys_writev 0x0790790792079014 globl hidden
scall sys_ioctl_cp 0x8368368362836810 globl hidden
scall sys_pread 0x8ad8ad9db2899811 globl hidden # a.k.a. pread64; netbsd+openbsd:pad
scall sys_pwrite 0x8ae8ae9dc289a812 globl hidden # a.k.a. pwrite64; netbsd+openbsd:pad
scall sys_readv 0x8788788782878813 globl hidden
scall sys_writev 0x8798798792879814 globl hidden
scall sys_access 0x0210210212021015 globl hidden
scall __sys_pipe 0x02a10721e202a016 globl hidden # NOTE: pipe2() on FreeBSD; XNU is pipe(void)→eax:edx
scall sys_select 0x1a104705d205d017 globl hidden
scall sys_pselect 0x1b406e20a218a10e globl hidden # pselect6() on gnu/systemd
scall sys_select 0x9a184785d285d817 globl hidden
scall sys_pselect 0x9b486ea0a298a90e globl hidden # pselect6() on gnu/systemd
scall sys_sched_yield 0x15e12a14bf25d018 globl hidden # select() on XNU (previously swtch() but removed in 12.4)
scall __sys_mremap 0x19bffffffffff019 globl hidden
scall sys_mincore 0x04e04e04e204e01b globl hidden
@ -69,20 +70,20 @@ scall sys_shmctl 0x1bb128200210701f globl # no wrapper; consider mmap
scall sys_dup 0x0290290292029020 globl hidden
scall sys_dup2 0x05a05a05a205a021 globl hidden
scall sys_pause 0xfffffffffffff022 globl hidden
scall sys_nanosleep 0x1ae05b0f0ffff023 globl hidden
scall sys_clock_nanosleep 0x1ddfff0f4ffff0e6 globl hidden
scall sys_nanosleep 0x9ae85b8f0ffff823 globl hidden
scall sys_clock_nanosleep 0x9ddfff8f4ffff8e6 globl hidden
scall sys_getitimer 0x1aa0460562056024 globl hidden
scall sys_setitimer 0x1a90450532053026 globl hidden
scall sys_alarm 0xfffffffffffff025 globl hidden
scall sys_getpid 0x0140140142014027 globl hidden # netbsd returns ppid in edx
scall sys_sendfile 0xffffff1892151028 globl hidden # Linux vs. XNU/BSD ABIs very different
scall __sys_socket 0x18a0610612061029 globl hidden
scall __sys_connect 0x062062062206202a globl hidden
scall __sys_accept 0x01e01e21d201e02b globl hidden # accept4 on freebsd
scall sys_sendto 0x085085085208502c globl hidden
scall sys_recvfrom 0x01d01d01d201d02d globl hidden
scall sys_sendmsg 0x01c01c01c201c02e globl hidden
scall sys_recvmsg 0x01b01b01b201b02f globl hidden
scall __sys_connect 0x862862862286282a globl hidden
scall __sys_accept 0x81e81ea1d281e82b globl hidden # accept4 on freebsd
scall sys_sendto 0x885885885288582c globl hidden
scall sys_recvfrom 0x81d81d81d281d82d globl hidden
scall sys_sendmsg 0x81c81c81c281c82e globl hidden
scall sys_recvmsg 0x81b81b81b281b82f globl hidden
scall sys_shutdown 0x0860860862086030 globl hidden
scall __sys_bind 0x0680680682068031 globl hidden
scall sys_listen 0x06a06a06a206a032 globl hidden
@ -95,7 +96,7 @@ scall __sys_fork 0x0020020022002039 globl hidden # xnu needs eax&=~-edx bc eax
#scall vfork 0x042042042204203a globl # this syscall is from the moon so we implement it by hand in libc/runtime/vfork.S; probably removed from XNU in 12.5
scall sys_posix_spawn 0x1daffffff20f4fff globl hidden # good luck figuring out how xnu defines this
scall __sys_execve 0x03b03b03b203b03b globl hidden
scall __sys_wait4 0x1c100b007200703d globl hidden
scall __sys_wait4 0x9c180b807280783d globl hidden
scall sys_kill 0x02507a025202503e globl hidden # kill(pid, sig, 1) b/c xnu
scall sys_killpg 0x092fff092fffffff globl hidden
scall sys_clone 0x11fffffffffff038 globl hidden
@ -109,15 +110,16 @@ scall sys_semop 0x0de1220de2100041 globl # no wrapper; won't polyfill for windo
scall sys_semctl 0xfff1271fe20fe042 globl # no wrapper; won't polyfill for windows
scall sys_shmdt 0x0e60e60e62108043 globl # no wrapper; won't polyfill for windows
scall sys_msgget 0x0e10e10e12103044 globl # no wrapper; won't polyfill for windows
scall sys_msgsnd 0x0e20e20e22104045 globl # no wrapper; won't polyfill for windows
scall sys_msgrcv 0x0e30e30e32105046 globl # no wrapper; won't polyfill for windows
scall sys_msgsnd 0x8e28e28e22904845 globl # no wrapper; won't polyfill for windows
scall sys_msgrcv 0x8e38e38e32905846 globl # no wrapper; won't polyfill for windows
scall sys_msgctl 0x1bc1291ff2102047 globl # no wrapper; won't polyfill for windows
scall __sys_fcntl 0x05c05c05c205c048 globl hidden
scall sys_flock 0x0830830832083049 globl hidden
scall sys_fsync 0x05f05f05f205f04a globl hidden
scall sys_fdatasync 0x0f105f22620bb04b globl hidden # fsync() on openbsd
scall sys_truncate 0x0c80c81df20c804c globl hidden # netbsd+openbsd:pad
scall sys_ftruncate 0x0c90c91e020c904d globl hidden # netbsd+openbsd:pad
scall __sys_fcntl_cp 0x85c85c85c285c848 globl hidden
scall sys_flock 0x8838838832883849 globl hidden
scall sys_fsync 0x85f85f85f285f84a globl hidden
scall sys_fdatasync 0x8f185fa2628bb84b globl hidden # fsync() on openbsd
scall sys_truncate 0x8c88c89df28c884c globl hidden # netbsd+openbsd:pad
scall sys_ftruncate 0x8c98c99e028c984d globl hidden # netbsd+openbsd:pad
scall sys_getcwd 0x128130146ffff04f globl hidden
scall sys_chdir 0x00c00c00c200c050 globl hidden
scall sys_fchdir 0x00d00d00d200d051 globl hidden
@ -163,14 +165,14 @@ scall sys_setresgid 0xfff11c138ffff077 globl hidden # polyfilled for xnu
scall sys_getresuid 0xfff119168ffff076 globl hidden # semantics aren't well-defined
scall sys_getresgid 0xfff11b169ffff078 globl hidden # semantics aren't well-defined
scall sys_sigpending 0x124034157203407f globl hidden # a.k.a. rt_sigpending on linux
scall sys_sigsuspend 0x12606f155206f082 globl hidden # a.k.a. rt_sigsuspend on Linux; openbsd:byvalue, sigsuspend_nocancel on XNU
scall sys_sigsuspend 0x92686f955286f882 globl hidden # a.k.a. rt_sigsuspend on Linux; openbsd:byvalue, sigsuspend_nocancel on XNU
scall sys_sigaltstack 0x1191200352035083 globl hidden
scall sys_mknod 0x1c200e00e200e085 globl hidden
scall sys_mknodat 0x1cc14022fffff103 globl # no wrapper; FreeBSD 12+
scall sys_mkfifo 0x0840840842084fff globl hidden
scall sys_mkfifoat 0x1cb13f1f1fffffff globl # no wrapper
scall sys_statfs 0x09d03f22b2159089 globl hidden
scall sys_fstatfs 0x09e04022c215a08a globl hidden
scall sys_statfs 0x89d83fa2b2959889 globl hidden
scall sys_fstatfs 0x89e840a2c295a88a globl hidden
scall sys_getpriority 0x064064064206408c globl hidden
scall sys_setpriority 0x060060060206008d globl hidden # modern nice()
scall sys_mlock 0x0cb0cb0cb20cb095 globl # no wrapper
@ -191,7 +193,7 @@ scall sys_setfsuid 0xfffffffffffff07a globl hidden
scall sys_setfsgid 0xfffffffffffff07b globl hidden
scall sys_capget 0xfffffffffffff07d globl # no wrapper
scall sys_capset 0xfffffffffffff07e globl # no wrapper
scall sys_sigtimedwait 0x1affff159ffff080 globl hidden
scall sys_sigtimedwait 0x9affff959ffff880 globl hidden
scall sys_sigqueue 0xffffff1c8fffffff globl hidden
scall sys_sigqueueinfo 0x0f5ffffffffff081 globl hidden # a.k.a. rt_sigqueueinfo on linux
scall sys_personality 0xfffffffffffff087 globl # no wrapper
@ -242,7 +244,7 @@ scall sys_io_submit 0xfffffffffffff0d1 globl # no wrapper
scall sys_io_cancel 0xfffffffffffff0d2 globl # no wrapper
scall sys_lookup_dcookie 0xfffffffffffff0d4 globl # no wrapper
scall sys_epoll_create 0xfffffffffffff0d5 globl hidden
scall sys_epoll_wait 0xfffffffffffff0e8 globl hidden
scall sys_epoll_wait 0xfffffffffffff8e8 globl hidden
scall sys_epoll_ctl 0xfffffffffffff0e9 globl hidden
scall sys_getdents 0x18606311020c40d9 globl hidden # use opendir/readdir; four args b/c xnu, getdirentries on xnu, 32-bit on xnu/freebsd, a.k.a. getdents64 on linux, 64-bit on openbsd
scall sys_set_tid_address 0xfffffffffffff0da globl # no wrapper
@ -273,7 +275,7 @@ scall sys_mq_timedreceive 0x1b1ffffffffff0f3 globl # won't polyfill
scall sys_mq_notify 0x106ffffffffff0f4 globl # won't polyfill
scall sys_mq_getsetattr 0xfffffffffffff0f5 globl # won't polyfill
scall sys_kexec_load 0xfffffffffffff0f6 globl # no wrapper
scall sys_waitid 0xfffffffff20ad0f7 globl # Linux 2.6.9+; no wrapper
scall sys_waitid 0xfffffffff28ad8f7 globl # Linux 2.6.9+; no wrapper
scall sys_add_key 0xfffffffffffff0f8 globl # no wrapper
scall sys_request_key 0xfffffffffffff0f9 globl # no wrapper
scall sys_keyctl 0xfffffffffffff0fa globl # no wrapper
@ -282,7 +284,7 @@ scall ioprio_get 0xfffffffffffff0fc globl
scall sys_inotify_init 0xfffffffffffff0fd globl # wicked # no wrapper
scall sys_inotify_add_watch 0xfffffffffffff0fe globl # no wrapper
scall sys_inotify_rm_watch 0xfffffffffffff0ff globl # no wrapper
scall __sys_openat 0x1d41411f321cf101 globl hidden # Linux 2.6.16+ (c. 2007)
scall __sys_openat 0x9d49419f329cf901 globl hidden # Linux 2.6.16+ (c. 2007)
scall sys_mkdirat 0x1cd13e1f021db102 globl hidden
scall sys_fchownat 0x1d013b1eb21d4104 globl hidden # @asyncsignalsafe
scall sys_utime 0xfffffffffffff084 globl hidden
@ -306,12 +308,12 @@ scall sys_vmsplice 0xfffffffffffff116 globl hidden
scall sys_migrate_pages 0xfffffffffffff100 globl # no wrapper; numa numa yay
scall sys_move_pages 0xfffffffffffff117 globl # no wrapper; NOTE: We view Red Hat versions as "epochs" for all distros.
#──────────────────────RHEL 5.0 LIMIT──────────────────────── # ←┬─ last distro with gplv2 licensed compiler c. 2007
scall sys_preadv 0x12110b121221c127 globl hidden # ├─ last distro with system v shell script init
scall sys_pwritev 0x12210c122221d128 globl hidden # ├─ rob landley unleashes busybox gpl lawsuits
scall sys_preadv 0x92190b9212a1c927 globl hidden # ├─ last distro with system v shell script init
scall sys_pwritev 0x92290c9222a1d928 globl hidden # ├─ rob landley unleashes busybox gpl lawsuits
scall __sys_utimensat 0x1d3054223ffff118 globl hidden # ├─ python modules need this due to pep513
scall sys_fallocate 0xfffffffffffff11d globl # ├─ end of life 2020-11-30 (extended)
scall posix_fallocate 0x1dffff212fffffff globl hidden # └─ cosmopolitan supports rhel5+
scall __sys_accept4 0xfff05d21dffff120 globl hidden # Linux 2.6.28+
scall sys_fallocate 0xfffffffffffff91d globl # ├─ end of life 2020-11-30 (extended)
scall posix_fallocate 0x9dffffa12fffffff globl hidden # └─ cosmopolitan supports rhel5+
scall __sys_accept4 0xfff85da1dffff920 globl hidden # Linux 2.6.28+
scall __sys_dup3 0x1c6066fffffff124 globl hidden # Linux 2.6.27+
scall __sys_pipe2 0x1c506521effff125 globl hidden # Linux 2.6.27+
scall sys_epoll_pwait 0xfffffffffffff119 globl # no wrapper
@ -347,7 +349,7 @@ scall sys_sched_setattr 0xfffffffffffff13a globl # ├─ desktop replaced with
scall sys_sched_getattr 0xfffffffffffff13b globl # ├─ karen sandler requires systemd init and boot for tablet gui
scall sys_renameat2 0xfffffffffffff13c globl # └─ debian founder ian murdock found strangled with vacuum cord
#scall seccomp 0xfffffffffffff13d globl # wrapped manually
scall sys_getrandom 0xfff00723321f413e globl hidden # Linux 3.17+ and getentropy() on XNU/OpenBSD, coming to NetBSD in 9.2
scall sys_getrandom 0xfff807a3329f493e globl hidden # Linux 3.17+ and getentropy() on XNU/OpenBSD, coming to NetBSD in 9.2
scall sys_memfd_create 0xfffffffffffff13f globl hidden
scall sys_kexec_file_load 0xfffffffffffff140 globl # no wrapper
scall sys_bpf 0xfffffffffffff141 globl # no wrapper

77
libc/sysv/systemfive.S
View file

@ -21,6 +21,7 @@
#include "libc/macros.internal.h"
#include "libc/nexgen32e/macros.h"
#include "libc/sysv/consts/sig.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/sysv/consts/nr.h"
#define SIG_IGN 1
@ -107,19 +108,60 @@ __pid: .quad 0
.endobj __pid,globl,hidden
.previous
.privileged
systemfive_cancellable: # our pthread_cancel() miracle code
cmpb $0,__tls_enabled(%rip) # inspired by the musl libc design!
je 1f # we handle linux and bsd together!
mov %fs:0,%r10 # CosmoTib::tib_self
mov 0x28(%r10),%r10 # CosmoTib::tib_pthread
test %r10,%r10 # is it a posix thread?
jz 1f # it's spawn() probably
testb $PT_NOCANCEL,0x00(%r10) # PosixThread::flags
jnz 1f # canceler no cancelling
cmp $0,0x04(%r10) # PosixThread::cancelled
jne _pthread_cancel_sys # tail call for masked mode
.weak _pthread_cancel_sys # must be linked if we're cancelled
1: mov %rcx,%r10 # move the fourth argument
clc # no cancellable system calls exist
syscall # that have 7+ args on the bsd OSes
systemfive_cancellable_end: # i/o calls park here for long time
jc systemfive_errno
jmp 0f
jc 3f # we're now out of the limbo state!
1: cmp $-4095,%rax # but we still check again on eintr
jae 2f
ret # done if the system call succeeded
2: neg %eax # now examine the nature of failure
3: cmp EINTR(%rip),%eax # did SIGCANCEL cancel our i/o call
jne systemfive_errno # werent interrupted by OnSigCancel
cmpb $0,__tls_enabled(%rip) # make sure it's safe to grab %fs:0
je systemfive_errno # tls is disabled we can't continue
mov %fs:0,%rcx # CosmoTib::tib_self
mov 0x28(%rcx),%rcx # CosmoTib::tib_pthread
test %rcx,%rcx # is it a posix thread?
jz systemfive_errno # it's spawn() probably
testb $PT_NOCANCEL,0x00(%rcx) # PosixThread::flags
jnz systemfive_errno # cancellation is disabled
cmp $0,0x04(%rcx) # PosixThread::cancelled
je systemfive_errno # we aren't actually cancelled
jmp _pthread_cancel_sys # now we are in fact cancelled
.endfn systemfive_cancellable,globl,hidden
.globl systemfive_cancellable_end
.hidden systemfive_cancellable_end
.Lanchorpoint:
#if SupportsLinux() || SupportsMetal()
systemfive_linux:
and $0xfff,%eax
cmp $0xfff,%eax
and $0xfff,%eax # remove nonlinux bits from ordinal
cmp $0xfff,%eax # checks if unsupported by platform
je systemfive_enosys # never taken branches cost nothing
btr $11,%eax # 0x800 means a call is cancellable
jc systemfive_cancellable # it is handled by the holiest code
mov %rcx,%r10 # syscall instruction clobbers %rcx
push %rbp # linux never reads args from stack
mov %rsp,%rbp # having frame will help backtraces
syscall # this is known as a context switch
pop %rbp # next we check to see if it failed
cmp $-4095,%rax # system five nexgen32e abi § a.2.1
0: cmp $-4095,%rax # system five nexgen32e abi § a.2.1
jae systemfive_error # encodes errno as neg return value
ret
.endfn systemfive_linux,globl,hidden
@ -167,17 +209,10 @@ systemfive_bsdscrub:
systemfive_bsd:
cmp $0xfff,%ax
je systemfive_enosys
btr $11,%eax # checks/reset the 800 cancellable bit
jc systemfive_cancellable
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
@ -391,22 +426,6 @@ _init_systemfive_sigsys:
pop %rdi
1: .endfn _init_systemfive_sigsys
#endif
#if SupportsSystemv() && !defined(TINY)
_init_systemfive_syscall:
mov __NR_msyscall,%eax # syscall origin protect
cmp $0xfff,%ax # openbsd is pretty cool
jae _init_systemfive_done
push %rdi
push %rsi
.weak __privileged_addr
.weak __privileged_size
mov $__privileged_addr,%edi
mov $__privileged_size,%esi
syscall
pop %rsi
pop %rdi
// 𝑠𝑙𝑖𝑑𝑒
#endif /* TINY */
_init_systemfive_done:
nop
.init.end 300,_init_systemfive,globl,hidden