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Justine Tunney 67b5200a0b Add MODE=optlinux build mode (#141)
2021-10-14 19:36:49 -07:00
..
calls Improve memory safety 2021-10-13 17:27:13 -07:00
consts Improve memory safety 2021-10-13 17:27:13 -07:00
errfuns Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00
machcalls Productionize new APE loader and more 2021-10-02 08:27:03 -07:00
consts.sh Improve memory safety 2021-10-13 17:27:13 -07:00
errfuns.h Add MODE=optlinux build mode (#141) 2021-10-14 19:36:49 -07:00
errfuns.sh Change license 2020-12-27 17:18:44 -08:00
g_syscount.S Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00
gen.sh Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00
machcalls.sh Productionize new APE loader and more 2021-10-02 08:27:03 -07:00
macros.internal.h Make improvements 2020-12-01 03:43:40 -08:00
README.md Initial import 2020-06-15 07:18:57 -07:00
restorert.S Improve memory safety 2021-10-13 17:27:13 -07:00
syscall.S Add MODE=optlinux build mode (#141) 2021-10-14 19:36:49 -07:00
syscalls.sh Improve memory safety 2021-10-13 17:27:13 -07:00
systemfive.S Improve memory safety 2021-10-13 17:27:13 -07:00
sysv.mk Remove more nonstandard stuff from cosmopolitan.h 2021-03-01 00:18:23 -08:00

README.md

SYNOPSIS

System Five Import Libraries

OVERVIEW

Bell System Five is the umbrella term we use to describe Linux, FreeBSD, OpenBSD, and Mac OS X which all have nearly-identical application binary interfaces that stood the test of time, having definitions nearly the same as those of AT&T back in the 1980's.

Cosmopolitan aims to help you build apps that can endure over the course of decades, just like these systems have: without needing to lift a finger for maintenance churn, broken builds, broken hearts.

The challenge to System V binary compatibility basically boils down to numbers. All these systems agree on what services are provided, but tend to grant them wildly different numbers.

We address this by putting all the numbers in a couple big shell scripts, ask the GNU Assembler to encode them into binaries using an efficient LEB128 encoding, unpacked by _init(), and ref'd via extern const. It gives us good debuggability, and any costs are gained back by fewer branches in wrapper functions.z