Mark Johnston 9f9c9b22ec Reimplement brk() and sbrk() to avoid the use of _end. ... Previously, libc.so would initialize its notion of the break address using _end, a special symbol emitted by the static linker following the bss section. Compatibility issues between lld and ld.bfd could cause the wrong definition of _end (libc.so's definition rather than that of the executable) to be used, breaking the brk()/sbrk() interface. Avoid this problem and future interoperability issues by simply not relying on _end. Instead, modify the break() system call to return the kernel's view of the current break address, and have libc initialize its state using an extra syscall upon the first use of the interface. As a side effect, this appears to fix brk()/sbrk() usage in executables run with rtld direct exec, since the kernel and libc.so no longer maintain separate views of the process' break address. PR: 228574 Reviewed by: kib (previous version) MFC after: 2 months Differential Revision: https://reviews.freebsd.org/D15663		2018-06-04 19:35:15 +00:00
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gen	Remove bogus checks against NCARGS.	2018-01-31 17:57:59 +00:00
softfloat	Add support files for compiling with soft-float. This has been	2008-04-27 18:34:34 +00:00
sys	Reimplement brk() and sbrk() to avoid the use of _end.	2018-06-04 19:35:15 +00:00
_fpmath.h	libc: further adoption of SPDX licensing ID tags.	2017-11-25 17:12:48 +00:00
arith.h	Add a comment describing why it's important for the values in this	2003-05-08 13:50:44 +00:00
gd_qnan.h	The distinction between quiet and signaling NaN formats is	2007-01-03 05:00:03 +00:00
Makefile.inc	Correct an misunderstanding of MDSRCS.	2017-03-02 17:07:28 +00:00
Symbol.map	Reimplement brk() and sbrk() to avoid the use of _end.	2018-06-04 19:35:15 +00:00
SYS.h	General further adoption of SPDX licensing ID tags.	2017-11-20 19:49:47 +00:00