src-test2/lib/libc/mips/sys, branch master

Reimplement brk() and sbrk() to avoid the use of _end.

2018-06-04T19:35:15Z

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

Replace MD assembly exect() with a portable version.

2018-04-12T18:23:14Z

Originally, on the VAX exect() enable tracing once the new executable image was loaded. This was possible because tracing was controllable through user space code by setting the PSL_T flag. The following instruction is a system call that activated tracing (as all instructions do) by copying PSL_T to PSL_TP (trace pending). The first instruction of the new executable image would trigger a trace fault. This is not portable to all platforms and the behavior was replaced with ptrace(PT_TRACE_ME, ...) since FreeBSD forked off of the CSRG repository. Platforms either incorrectly call execve(), trigger trace faults inside the original executable, or do contain an implementation of this function. The exect() interfaces is deprecated or removed on NetBSD and OpenBSD. Submitted by: Ali Mashtizadeh Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D14989

Remove architecture specific shmat.S files.

2018-04-05T18:17:46Z

These files are identical to the generated system calls. In the case of MIPS, the file was already disconnected from the build. Submitted by: Ali Mashtizadeh Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D14976

Reduce duplicate NOASM and PSEUDO definitions

2016-09-08T22:38:20Z

The initial value of NOASM is nearly the same in all cases and the initial value of PSEUDO is the same in all cases so reduce duplication (and hopefully, future merge conflicts) by machine independent defaults. Also document the PSEUDO variable. Reviewed by: jhb, kib Obtained from: CheriBSD Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D7820

Rewrite ptrace(2) wrappers in C.

2016-08-29T18:47:51Z

Besides removing hand-translation to assembler, this also adds missing wrappers for arm64 and risc-v. Reviewed by: emaste, jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D7694

Remove unusedd and obsolete openbsd_poll system call. (Phase 1)

2016-08-18T10:50:40Z

Reported by: brooks Reviewed by: brooks,jhb Differential Revision: https://reviews.freebsd.org/D7548

Replace use of the pipe(2) system call with pipe2(2) with a zero flags

2016-06-22T21:11:27Z

value. This eliminates the need for machine dependant assembly wrappers for pipe(2). It also make passing an invalid address to pipe(2) return EFAULT rather than triggering a segfault. Document this behavior (which was already true for pipe2(2), but undocumented). Reviewed by: andrew Approved by: re (gjb) Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D6815

Removed unused special fork() implementations.

2015-05-29T19:42:55Z

The arm version hasn't been used in ages. The mips version uses a valid, but pointless check of v1 and has been unhooked from the build since r276630. Differential Revision: https://reviews.freebsd.org/D2592 Reviewed by: emaste Sponsored by: DARPA, AFRL

The lseek(2), mmap(2), truncate(2), ftruncate(2), pread(2), and

2015-04-18T21:50:13Z

pwrite(2) syscalls are wrapped to provide compatibility with pre-7.x kernels which required padding before the off_t parameter. The fcntl(2) contains compatibility code to handle kernels before the struct flock was changed during the 8.x CURRENT development. The shims were reasonable to allow easier revert to the older kernel at that time. Now, two or three major releases later, shims do not serve any purpose. Such old kernels cannot handle current libc, so revert the compatibility code. Make padded syscalls support conditional under the COMPAT6 config option. For COMPAT32, the syscalls were under COMPAT6 already. Remove WITHOUT_SYSCALL_COMPAT build option, which only purpose was to (partially) disable the removed shims. Reviewed by: jhb, imp (previous versions) Discussed with: peter Sponsored by: The FreeBSD Foundation MFC after: 1 week

libc: Eliminate duplicate copies of __vdso_gettc.c

2015-04-02T21:18:11Z

Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D2152