musl - musl - an implementation of the standard library for Linux-based systems

Age	Commit message (Collapse)	Author	Lines
2018-06-20	work around broken kernel struct ipc_perm on some big endian archs	Rich Felker	-0/+2
	the mode member of struct ipc_perm is specified by POSIX to have type mode_t, which is uniformly defined as unsigned int. however, Linux defines it with type __kernel_mode_t, and defines __kernel_mode_t as unsigned short on some archs. since there is a subsequent padding field, treating it as a 32-bit unsigned int works on little endian archs, but the order is backwards on big endian archs with the erroneous definition. since multiple archs are affected, remedy the situation with fixup code in the affected functions (shmctl, semctl, and msgctl) rather than repeating the same shims in syscall_arch.h for every affected arch.
2018-05-01	work around arm gcc's rejection of r7 asm constraints in thumb mode	Rich Felker	-14/+39
	in thumb mode, r7 is the ABI frame pointer register, and unless frame pointer is disabled, gcc insists on treating it as a fixed register, refusing to spill it to satisfy constraints. unfortunately, r7 is also used in the syscall ABI for passing the syscall number. up til now we just treated this as a requirement to disable frame pointer when generating code as thumb, but it turns out gcc forcibly enables frame pointer, and the fixed register constraint that goes with it, for functions which contain VLAs. this produces an unacceptable arch-specific constraint that (non-arm-specific) source files making syscalls cannot use VLAs. as a workaround, avoid r7 register constraints when producing thumb code and instead save/restore r7 in a temp register as part of the asm block. at some point we may want/need to support armv6-m/thumb1, so the asm has been tweaked to be thumb1-compatible while also near-optimal for thumb2: it allows the temp and/or syscall number to be in high registers (necessary since r0-r5 may all be used for syscalll args) and in thumb2 mode allows the syscall number to be an 8-bit immediate.
2016-07-01	fix posix_fadvise syscall args on powerpc, unify with arm fix	Rich Felker	-0/+2
	commit 6d38c9cf80f47623e5e48190046673bbd0dc410b provided an arm-specific version of posix_fadvise to address the alternate argument order the kernel expects on arm, but neglected to address that powerpc (32-bit) has the same issue. instead of having arch variant files in duplicate, simply put the alternate version in the top-level file under the control of a macro defined in syscall_arch.h.
2015-06-14	arm: add vdso support	Szabolcs Nagy	-0/+4
	vdso will be available on arm in linux v4.2, the user-space code for it is in kernel commit 8512287a8165592466cb9cb347ba94892e9c56a5
2015-04-30	fix __syscall declaration with wrong visibility in syscall_arch.h	Szabolcs Nagy	-2/+0
	remove __syscall declaration where it is not needed (aarch64, arm, microblaze, or1k) and add the hidden attribute where it is (mips).
2014-11-22	inline 5- and 6-argument syscalls on arm	Rich Felker	-2/+15

2014-11-22	remove old clang workarounds from arm syscall implementation	Rich Felker	-31/+0
	the register constraints in the non-clang case were tested to work on clang back to 3.2, and earlier versions of clang have known bugs that preclude building musl. there may be other reasons to prefer not to use inline syscalls, but if so the function-call-based implementations should be added back in a unified way for all archs.
2014-02-24	fixup general __syscall breakage introduced in x32 port	rofl0r	-0/+2
	the reordering of headers caused some risc archs to not see the __syscall declaration anymore. this caused build errors on mips with any compiler, and on arm and microblaze with clang. we now declare it locally just like the powerpc port does.
2013-03-26	remove __SYSCALL_SSLEN arch macro in favor of using public _NSIG	Rich Felker	-2/+0
	the issue at hand is that many syscalls require as an argument the kernel-ABI size of sigset_t, intended to allow the kernel to switch to a larger sigset_t in the future. previously, each arch was defining this size in syscall_arch.h, which was redundant with the definition of _NSIG in bits/signal.h. as it's used in some not-quite-portable application code as well, _NSIG is much more likely to be recognized and understood immediately by someone reading the code, and it's also shorter and less cluttered. note that _NSIG is actually 65/129, not 64/128, but the division takes care of throwing away the off-by-one part.
2012-09-15	fix syscall asm constraints for arm too	Rich Felker	-4/+4
	no problems were detected so far, but the constraints seem to have been invalid just like the mips ones.
2012-09-09	inline syscall support for arm	Rich Felker	-0/+53
	most pure-syscall-wrapper functions compile to the smallest/simplest code possible (save r7 ; load syscall # ; svc 0 ; restore r7 ; tail call to __syscall_ret).
2012-09-08	syscall organization overhaul	Rich Felker	-0/+41
	now public syscall.h only exposes __NR_* and SYS_* constants and the variadic syscall function. no macros or inline functions, no __syscall_ret or other internal details, no 16-/32-bit legacy syscall renaming, etc. this logic has all been moved to src/internal/syscall.h with the arch-specific parts in arch/$(ARCH)/syscall_arch.h, and the amount of arch-specific stuff has been reduced to a minimum. changes still need to be reviewed/double-checked. minimal testing on i386 and mips has already been performed.