musl - The musl libc tree (WIP / dev branches)

Age	Commit message (Collapse)	Author	Files	Lines
2020-03-14	revert mips64/n32 syscall asm clean-up due to regressions	Rich Felker	1	-28/+28
	effectivly revert commit ddc7c4f936c7a90781072f10dbaa122007e939d0 which was wrong; it caused a major regression on Linux versions prior to 2.6.36. old kernels did not properly preserve r2 across syscall restart, and instead restarted with the instruction right before syscall, imposing a contract that the previous instruction must load r2 from an immediate or a register (or memory) not clobbered by the syscall. since other changes were made since, including removal of the struct stat conversion that was replaced by separate struct kstat, this is not a direct revert, only a functional one. the "0"(r2) input constraint added back seems useless/erroneous, but without it most gcc versions (seems to be all prior to 9.x) fail to honor the output register binding for r2. this seems to be a variant of gcc bug #87733. further changes should be made later if a better workaround is found, but this one has been working since 2012. it seems this issue was encountered but misidentified then, when it inspired commit 4221f154ff29ab0d6be1e7beaa5ea2d1731bc58e.
2019-09-26	fix mips r6 syscall clobber lists not to include hi/lo registers	Rich Felker	1	-0/+6
	mips r6 (an incompatible isa from traditional mips) removes the hi and lo registers used for mul/div results. older gcc versions accepted them in the clobber list for asm, but their presence is incorrect and breaks on later versions. in the process of fixing this, the clobber list for 32-bit mips syscalls has been deduplicated via a macro like on mips64 and n32.
2019-07-31	get/setsockopt: add fallback for new time64 SO_RCVTIMEO/SO_SNDTIMEO	Rich Felker	1	-0/+3
	without this, the SO_RCVTIMEO and SO_SNDTIMEO socket options would stop working on pre-5.1 kernels after time_t is switched to 64-bit and their values are changed to the new time64 versions. new code is written such that it's statically unreachable on 64-bit archs, and on existing 32-bit archs until the macro values are changed to activate 64-bit time_t.
2019-07-18	remove mips/n32/64 stat struct hacks from syscall machinery	Rich Felker	1	-120/+5
	now that we have a kstat structure decoupled from the public struct stat, we can just use the broken kernel structures directly and let the code in fstatat do the translation.
2019-07-16	clean up mips64/n32 syscall asm constraints	Rich Felker	1	-27/+28
	ever since inline syscalls were added for (o32) mips in commit 328810d32524e4928fec50b57e37e1bf330b2e40, the asm has nonsensically loaded the syscall number, rather than taking $2 as an input constraint to let the compiler load it. commit cfc09b1ecf0c6981494fd73dffe234416f66af10 improved on this somewhat by allowing a constant syscall number to propagate into an immediate, but missed that the whole operation made no sense. now, only $4, $5, $6, $8, and $9 are potential input-only registers. $2 is always input and output, and $7 is both when it's an argument, otherwise output-only. previously, $7 was treated as an input (with a "1" constraint matching its output position) even when it was not an input, which was arguably undefined behavior (asm input from indeterminate value). this is corrected.
2019-07-16	deduplicate mips64/n32 syscall clobbered register lists	Rich Felker	1	-14/+11
	this patch is not purely non-functional changes, since before, $8 and $9 were wrongly in the clobberlist for syscalls with fewer than 5 or 6 arguments. of course it's impossible for syscalls to have different clobbers depending on their number of arguments. the clobberlist for the recently-added 5- and 6-argument forms was correct, and for the 0- to 4-argument forms was erroneously copied from the mips o32 ABI where the additional arguments had to be passed on the stack. in making this change, I reviewed the kernel sources, and $8 and $9 are always saved for 64-bit kernels since they're part of the syscall argument list for n32 and n64 ABIs.
2019-04-10	implement inline 5- and 6-argument syscalls for mipsn32 and mips64	Rich Felker	1	-23/+43
	n32 and n64 ABIs add new argument registers vs o32, so that passing on the stack is not necessary, so it's not clear why the 5- and 6-argument versions were special-cased to begin with; it seems to have been pattern-copying from arch/mips (o32). i've treated the new argument registers like the first 4 in terms of clobber status (non-clobbered). hopefully this is correct.
2019-04-10	cleanup mips64 syscall_arch functions	Rich Felker	1	-18/+9

2017-05-31	remove long-obsolete clang workarounds from mips* syscall_arch.h files	Rich Felker	1	-75/+0
	at one point, clang reportedly failed to support the asm register constraints needed for inline syscalls. versions of clang that old have much bigger problems that preclude using them to compile musl libc.
2017-05-31	fix fstatat syscall on mips64	Rich Felker	1	-3/+22
	mips64 requires 'struct stat' conversion due to incorrect 32-bit fields where time_t should be in the kernel version of the structure. syscall_arch.h already performed the correct translation for stat, fstat, and lstat syscalls, but omitted special handling for fstatat.
2016-03-06	add mips64 port	Rich Felker	1	-0/+281
	patch by Mahesh Bodapati and Jaydeep Patil of Imagination Technologies.