kernel/git/next/linux-next.git/tools/include/nolibc/arch-mips.h, branch master

tools/nolibc: add ftruncate()

2026-05-24T21:58:04+00:00

On architectures with 32-bit longs, call the compat syscall __NR_ftruncate64. As off_t is 64-bit it must be split into 2 registers. Unlike llseek() which passes the high and low parts in explicitly named arguments, the order here is endian independent. Some architectures (arm, mips, ppc) require this pair of registers to be aligned to an even register, so add custom _sys_ftruncate64() wrappers for those. A test case for ftruncate is added which validates negative length or invalid fd return the appropriate error, and checks the length is correct on success. Co-developed-by: Jordan Richards Signed-off-by: Jordan Richards Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Reviewed-by: Daniel Palmer Link: https://patch.msgid.link/20260521-nolibc-ftruncate-v1-3-5384a83b2402@weissschuh.net

tools/nolibc: handle 64-bit system call arguments on MIPS N32

2026-04-27T18:09:07+00:00

The N32 system call ABI expects 64-bit values directly in registers. This does not work on nolibc currently, as a 'long' is only 32 bits wide. Switch the system call wrappers to use 'long long' instead which can handle 64-bit values on N32. As on N64 'long' and 'long long' are the same, this does not change the behavior there. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260418-nolibc-largefile-v1-5-b91f0775bac3@weissschuh.net

tools/nolibc: Rename __no_stack_protector to __nolibc_no_stack_protector

2026-04-27T16:14:47+00:00

To avoid polluting the namespace rename __no_stack_protector to __nolibc_no_stack_protector so its now within the nolibc umbrella. Suggested-by: Willy Tarreau Signed-off-by: Daniel Palmer Link: https://patch.msgid.link/20260425111315.3191461-2-daniel@thingy.jp Signed-off-by: Thomas Weißschuh

tools/nolibc: MIPS: fix clobbers of 'lo' and 'hi' registers on different ISAs

2026-03-20T16:58:26+00:00

All MIPS ISAs before r6 use the 'lo' and 'hi' special registers. These are clobbered by system calls and need to be marked as such to avoid miscompilations. Currently nolibc ties the clobbers to the ABI. But this is wrong and leads to ISA<->ABI combinations which are not handled correctly, leading to compiler errors or miscompilations. Handle all different combinations of ABI and ISA. Fixes: a6a2a8a42972 ("tools/nolibc: MIPS: add support for N64 and N32 ABIs") Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Suggested-by: Maciej W. Rozycki Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.2603141744240.55200@angie.orcam.me.uk/ Signed-off-by: Thomas Weißschuh Link: https://patch.msgid.link/20260317-nolibc-mips-clobber-v2-1-5b9a97761a9e@linutronix.de Signed-off-by: Thomas Weißschuh

tools/nolibc: rename my_syscallX() to __nolibc_syscallX()

2026-02-25T07:21:17+00:00

The naming convention of the my_syscallX() macros is a bit unfortunate. They may conflict with application code and the name is very generic. Switch to __nolibc_syscallX(). The leading underscores place the symbols in the implementation-defined namespace, avoiding conflicting names. It is also clearer that these are non-standard extensions from nolibc. Signed-off-by: Thomas Weißschuh Acked-by: Willy Tarreau Link: https://patch.msgid.link/20260223-nolibc-namespacing-v1-1-52574ffebb2c@weissschuh.net

tools/nolibc: add option to disable runtime

2025-10-29T15:29:16+00:00

In principle, it is possible to use nolibc for only some object files in a program. In that case, the startup code in _start and _start_c is not going to be used. Add the NOLIBC_NO_RUNTIME compile time option to disable it entirely and also remove anything that depends on it. Doing this avoids warnings from modpost for UML as the _start_c code references the main function from the .init.text section while it is not inside .init itself. Signed-off-by: Benjamin Berg Signed-off-by: Thomas Weißschuh

tools/nolibc: MIPS: add support for N64 and N32 ABIs

2025-06-28T20:23:33+00:00

Add support for the MIPS 64bit N64 and ILP32 N32 ABIs. In addition to different byte orders and ABIs there are also different releases of the MIPS architecture. To avoid blowing up the test matrix, only add a subset of all possible test combinations. Signed-off-by: Thomas Weißschuh Tested-by: Sebastian Andrzej Siewior Link: https://lore.kernel.org/r/20250623-nolibc-mips-n32-v3-4-6ae2d89f4259@weissschuh.net

tools/nolibc: MIPS: drop noreorder option

2025-06-28T20:23:25+00:00

There are no more statements in the assembly code which would require the usage of ".set noreorder". Remove the option. This also allows removal of the manual "nop" instruction in the delay slot. Suggested-by: Maciej W. Rozycki Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.2502172208570.65342@angie.orcam.me.uk/ Signed-off-by: Thomas Weißschuh Tested-by: Sebastian Andrzej Siewior Link: https://lore.kernel.org/r/20250623-nolibc-mips-n32-v3-3-6ae2d89f4259@weissschuh.net

tools/nolibc: MIPS: drop manual stack pointer alignment

2025-06-28T20:23:20+00:00

The stack pointer is already aligned by the kernel to a multiple of 16. All modifications of the register have been removed from the entrypoint, so the manual realignment is unnecessary. Drop the manual alignment. Suggested-by: Maciej W. Rozycki Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.2502161523290.65342@angie.orcam.me.uk/ Signed-off-by: Thomas Weißschuh Tested-by: Sebastian Andrzej Siewior Link: https://lore.kernel.org/r/20250623-nolibc-mips-n32-v3-2-6ae2d89f4259@weissschuh.net

tools/nolibc: MIPS: drop $gp setup

2025-06-28T20:23:02+00:00

The setup of the global pointer "$gp" register was necessary when the C entrypoint was called through "jal ". However since commit 0daf8c86a451 ("tools/nolibc: mips: load current function to $t9") "jalr" is used instead which does not require "$gp". Remove the unnecessary $gp setup, simplifying the code and opening the road for some other cleanups. Suggested-by: Maciej W. Rozycki Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.2502172208570.65342@angie.orcam.me.uk/ Signed-off-by: Thomas Weißschuh Tested-by: Sebastian Andrzej Siewior Link: https://lore.kernel.org/r/20250623-nolibc-mips-n32-v3-1-6ae2d89f4259@weissschuh.net