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* tools/nolibc: add stdarg.h headerThomas Weißschuh2023-10-121-2/+2
| | | | | | | | | | | | | | | This allows nolic to work with `-nostdinc` avoiding any reliance on system headers. The implementation has been lifted from musl libc 1.2.4. There is already an implementation of stdarg.h in include/linux/stdarg.h but that is GPL licensed and therefore not suitable for nolibc. The used compiler builtins have been validated to be at least available since GCC 4.1.2 and clang 3.0.0. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Signed-off-by: Willy Tarreau <w@1wt.eu>
* tools/nolibc: add missing my_syscall6() for mipsZhangjin Wu2023-08-231-5/+4
| | | | | | | | | | | | | | | It is able to pass the 6th argument like the 5th argument via the stack for mips, let's add a new my_syscall6() now, see [1] for details: The mips/o32 system call convention passes arguments 5 through 8 on the user stack. Both mmap() and pselect6() require my_syscall6(). [1]: https://man7.org/linux/man-pages/man2/syscall.2.html Signed-off-by: Zhangjin Wu <falcon@tinylab.org> Signed-off-by: Willy Tarreau <w@1wt.eu>
* tools/nolibc: Fix build of stdio.h due to header orderingMark Brown2023-06-091-1/+1
| | | | | | | | | | | | | | | When we added fd based file streams we created references to STx_FILENO in stdio.h but these constants are declared in unistd.h which is the last file included by the top level nolibc.h meaning those constants are not defined when we try to build stdio.h. This causes programs using nolibc.h to fail to build. Reorder the headers to avoid this issue. Fixes: d449546c957f ("tools/nolibc: implement fd-based FILE streams") Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: add support for stack protectorThomas Weißschuh2023-03-271-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is useful when using nolibc for security-critical tools. Using nolibc has the advantage that the code is easily auditable and sandboxable with seccomp as no unexpected syscalls are used. Using compiler-assistent stack protection provides another security mechanism. For this to work the compiler and libc have to collaborate. This patch adds the following parts to nolibc that are required by the compiler: * __stack_chk_guard: random sentinel value * __stack_chk_fail: handler for detected stack smashes In addition an initialization function is added that randomizes the sentinel value. Only support for global guards is implemented. Register guards are useful in multi-threaded context which nolibc does not provide support for. Link: https://lwn.net/Articles/584225/ Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: also mention how to build by just setting the include pathWilly Tarreau2022-04-201-10/+20
| | | | | | | | | | | | | | Now that a few basic include files are provided, some simple portable programs may build, which will save them from having to surround their includes with #ifndef NOLIBC. This patch mentions how to proceed, and enumerates the list of files that are covered. A comprehensive list of required include files is available here: https://en.cppreference.com/w/c/header Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/time: create time.h with time()Willy Tarreau2022-04-201-0/+1
| | | | | | | | | | | The time() syscall is used by a few simple applications, and is trivial to implement based on gettimeofday() that we already have. Let's create the file to ease porting and provide the function. It never returns any error, though it may segfault in case of invalid pointer, like other implementations relying on gettimeofday(). Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/signal: move raise() to signal.hWilly Tarreau2022-04-201-0/+1
| | | | | | | | This function is normally found in signal.h, and providing the file eases porting of existing programs. Let's move it there. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/unistd: extract msleep(), sleep(), tcsetpgrp() to unistd.hWilly Tarreau2022-04-201-0/+1
| | | | | | | | These functions are normally provided by unistd.h. For ease of porting, let's create the file and move them there. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/stdio: add a minimal set of stdio functionsWilly Tarreau2022-04-201-0/+1
| | | | | | | This only provides getchar(), putchar(), and puts(). Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/stdlib: move ltoa() to stdlib.hWilly Tarreau2022-04-201-22/+0
| | | | | | | | | | | This function is not standard and performs the opposite of atol(). Let's move it with atol(). It's been split between a reentrant function and one using a static buffer. There's no more definition in nolibc.h anymore now. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/types: move makedev to types.h and make it a macroWilly Tarreau2022-04-201-9/+0
| | | | | | | | | | The makedev() man page says it's supposed to be a macro and that some OSes have it with the other ones in sys/types.h so it now makes sense to move it to types.h as a macro. Let's also define major() and minor() that perform the reverse operation. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/types: move the FD_* functions to macros in types.hWilly Tarreau2022-04-201-14/+0
| | | | | | | | | | | | | FD_SET, FD_CLR, FD_ISSET, FD_ZERO are often expected to be macros and not functions. In addition we already have a file dedicated to such macros and types used by syscalls, it's types.h, so let's move them there and turn them to macros. FD_CLR() and FD_ISSET() were missing, so they were added. FD_ZERO() now deals with its own loop so that it doesn't rely on memset() that sets one byte at a time. Cc: David Laight <David.Laight@aculab.com> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/ctype: split the is* functions to ctype.hWilly Tarreau2022-04-201-6/+1
| | | | | | | In fact there's only isdigit() for now. More should definitely be added. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/string: split the string functions into string.hWilly Tarreau2022-04-201-95/+1
| | | | | | | | | | The string manipulation functions (mem*, str*) are now found in string.h. The file depends on almost nothing and will be usable from other includes if needed. Maybe more functions could be added. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/stdlib: extract the stdlib-specific functions to their own fileWilly Tarreau2022-04-201-66/+1
| | | | | | | | The new file stdlib.h contains the definitions of functions that are usually found in stdlib.h. Many more could certainly be added. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/sys: split the syscall definitions into their own fileWilly Tarreau2022-04-201-962/+3
| | | | | | | | | | The syscall definitions were moved to sys.h. They were arranged in a more easily maintainable order, whereby the sys_xxx() and xxx() functions were grouped together, which also enlights the occasional mappings such as wait relying on wait4(). Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/arch: split arch-specific code into individual filesWilly Tarreau2022-04-201-1186/+1
| | | | | | | | | | | | In order to ease maintenance, this splits the arch-specific code into one file per architecture. A common file "arch.h" is used to include the right file among arch-* based on the detected architecture. Projects which are already split per architecture could simply rename these files to $arch/arch.h and get rid of the common arch.h. For this reason, include guards were placed into each arch-specific file. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/types: split syscall-specific definitions into their own filesWilly Tarreau2022-04-201-108/+2
| | | | | | | | | | The macros and type definitions used by a number of syscalls were moved to types.h where they will be easier to maintain. A few of them are arch-specific and must not be moved there (e.g. O_*, sys_stat_struct). A warning about them was placed at the top of the file. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc/std: move the standard type definitions to std.hWilly Tarreau2022-04-201-37/+5
| | | | | | | | | | | | | | The ordering of includes and definitions for now is a bit of a mess, as for example asm/signal.h is included after int definitions, but plenty of structures are defined later as they rely on other includes. Let's move the standard type definitions to a dedicated file that is included first. We also move NULL there. This way all other includes are aware of it, and we can bring asm/signal.h back to the top of the file. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: guard the main file against multiple inclusionWilly Tarreau2022-04-111-0/+4
| | | | | | | | Including nolibc.h multiple times results in build errors due to multiple definitions. Let's add a guard against multiple inclusions. Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: use pselect6 on RISCVWilly Tarreau2022-04-111-0/+3
| | | | | | | | This arch doesn't provide the old-style select() syscall, we have to use pselect6(). Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Implement gettid()Mark Brown2021-11-301-0/+18
| | | | | | | | | Allow test programs to determine their thread ID. Signed-off-by: Mark Brown <broonie@kernel.org> Cc: Willy Tarreau <w@1wt.eu> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: x86-64: Use `mov $60,%eax` instead of `mov $60,%rax`Ammar Faizi2021-11-301-1/+1
| | | | | | | | | | | | | | | Note that mov to 32-bit register will zero extend to 64-bit register. Thus `mov $60,%eax` has the same effect with `mov $60,%rax`. Use the shorter opcode to achieve the same thing. ``` b8 3c 00 00 00 mov $60,%eax (5 bytes) [1] 48 c7 c0 3c 00 00 00 mov $60,%rax (7 bytes) [2] ``` Currently, we use [2]. Change it to [1] for shorter code. Signed-off-by: Ammar Faizi <ammar.faizi@students.amikom.ac.id> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber listAmmar Faizi2021-11-301-14/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Linux x86-64 syscall only clobbers rax, rcx and r11 (and "memory"). - rax for the return value. - rcx to save the return address. - r11 to save the rflags. Other registers are preserved. Having r8, r9 and r10 in the syscall clobber list is harmless, but this results in a missed-optimization. As the syscall doesn't clobber r8-r10, GCC should be allowed to reuse their value after the syscall returns to userspace. But since they are in the clobber list, GCC will always miss this opportunity. Remove them from the x86-64 syscall clobber list to help GCC generate better code and fix the comment. See also the x86-64 ABI, section A.2 AMD64 Linux Kernel Conventions, A.2.1 Calling Conventions [1]. Extra note: Some people may think it does not really give a benefit to remove r8, r9 and r10 from the syscall clobber list because the impression of syscall is a C function call, and function call always clobbers those 3. However, that is not the case for nolibc.h, because we have a potential to inline the "syscall" instruction (which its opcode is "0f 05") to the user functions. All syscalls in the nolibc.h are written as a static function with inline ASM and are likely always inline if we use optimization flag, so this is a profit not to have r8, r9 and r10 in the clobber list. Here is the example where this matters. Consider the following C code: ``` #include "tools/include/nolibc/nolibc.h" #define read_abc(a, b, c) __asm__ volatile("nop"::"r"(a),"r"(b),"r"(c)) int main(void) { int a = 0xaa; int b = 0xbb; int c = 0xcc; read_abc(a, b, c); write(1, "test\n", 5); read_abc(a, b, c); return 0; } ``` Compile with: gcc -Os test.c -o test -nostdlib With r8, r9, r10 in the clobber list, GCC generates this: 0000000000001000 <main>: 1000: f3 0f 1e fa endbr64 1004: 41 54 push %r12 1006: 41 bc cc 00 00 00 mov $0xcc,%r12d 100c: 55 push %rbp 100d: bd bb 00 00 00 mov $0xbb,%ebp 1012: 53 push %rbx 1013: bb aa 00 00 00 mov $0xaa,%ebx 1018: 90 nop 1019: b8 01 00 00 00 mov $0x1,%eax 101e: bf 01 00 00 00 mov $0x1,%edi 1023: ba 05 00 00 00 mov $0x5,%edx 1028: 48 8d 35 d1 0f 00 00 lea 0xfd1(%rip),%rsi 102f: 0f 05 syscall 1031: 90 nop 1032: 31 c0 xor %eax,%eax 1034: 5b pop %rbx 1035: 5d pop %rbp 1036: 41 5c pop %r12 1038: c3 ret GCC thinks that syscall will clobber r8, r9, r10. So it spills 0xaa, 0xbb and 0xcc to callee saved registers (r12, rbp and rbx). This is clearly extra memory access and extra stack size for preserving them. But syscall does not actually clobber them, so this is a missed optimization. Now without r8, r9, r10 in the clobber list, GCC generates better code: 0000000000001000 <main>: 1000: f3 0f 1e fa endbr64 1004: 41 b8 aa 00 00 00 mov $0xaa,%r8d 100a: 41 b9 bb 00 00 00 mov $0xbb,%r9d 1010: 41 ba cc 00 00 00 mov $0xcc,%r10d 1016: 90 nop 1017: b8 01 00 00 00 mov $0x1,%eax 101c: bf 01 00 00 00 mov $0x1,%edi 1021: ba 05 00 00 00 mov $0x5,%edx 1026: 48 8d 35 d3 0f 00 00 lea 0xfd3(%rip),%rsi 102d: 0f 05 syscall 102f: 90 nop 1030: 31 c0 xor %eax,%eax 1032: c3 ret Cc: Andy Lutomirski <luto@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: x86@kernel.org Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: David Laight <David.Laight@ACULAB.COM> Acked-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Ammar Faizi <ammar.faizi@students.amikom.ac.id> Link: https://gitlab.com/x86-psABIs/x86-64-ABI/-/wikis/x86-64-psABI [1] Link: https://lore.kernel.org/lkml/20211011040344.437264-1-ammar.faizi@students.amikom.ac.id/ Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: fix incorrect truncation of exit codeWilly Tarreau2021-11-301-8/+5
| | | | | | | | | | | | | | | | | | | | | | | Ammar Faizi reported that our exit code handling is wrong. We truncate it to the lowest 8 bits but the syscall itself is expected to take a regular 32-bit signed integer, not an unsigned char. It's the kernel that later truncates it to the lowest 8 bits. The difference is visible in strace, where the program below used to show exit(255) instead of exit(-1): int main(void) { return -1; } This patch applies the fix to all archs. x86_64, i386, arm64, armv7 and mips were all tested and confirmed to work fine now. Risc-v was not tested but the change is trivial and exactly the same as for other archs. Reported-by: Ammar Faizi <ammar.faizi@students.amikom.ac.id> Cc: stable@vger.kernel.org Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: i386: fix initial stack alignmentWilly Tarreau2021-11-301-1/+9
| | | | | | | | | | | | | | | After re-checking in the spec and comparing stack offsets with glibc, The last pushed argument must be 16-byte aligned (i.e. aligned before the call) so that in the callee esp+4 is multiple of 16, so the principle is the 32-bit equivalent to what Ammar fixed for x86_64. It's possible that 32-bit code using SSE2 or MMX could have been affected. In addition the frame pointer ought to be zero at the deepest level. Link: https://gitlab.com/x86-psABIs/i386-ABI/-/wikis/Intel386-psABI Cc: Ammar Faizi <ammar.faizi@students.amikom.ac.id> Cc: stable@vger.kernel.org Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: x86-64: Fix startup code bugAmmar Faizi2021-11-301-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before this patch, the `_start` function looks like this: ``` 0000000000001170 <_start>: 1170: pop %rdi 1171: mov %rsp,%rsi 1174: lea 0x8(%rsi,%rdi,8),%rdx 1179: and $0xfffffffffffffff0,%rsp 117d: sub $0x8,%rsp 1181: call 1000 <main> 1186: movzbq %al,%rdi 118a: mov $0x3c,%rax 1191: syscall 1193: hlt 1194: data16 cs nopw 0x0(%rax,%rax,1) 119f: nop ``` Note the "and" to %rsp with $-16, it makes the %rsp be 16-byte aligned, but then there is a "sub" with $0x8 which makes the %rsp no longer 16-byte aligned, then it calls main. That's the bug! What actually the x86-64 System V ABI mandates is that right before the "call", the %rsp must be 16-byte aligned, not after the "call". So the "sub" with $0x8 here breaks the alignment. Remove it. An example where this rule matters is when the callee needs to align its stack at 16-byte for aligned move instruction, like `movdqa` and `movaps`. If the callee can't align its stack properly, it will result in segmentation fault. x86-64 System V ABI also mandates the deepest stack frame should be zero. Just to be safe, let's zero the %rbp on startup as the content of %rbp may be unspecified when the program starts. Now it looks like this: ``` 0000000000001170 <_start>: 1170: pop %rdi 1171: mov %rsp,%rsi 1174: lea 0x8(%rsi,%rdi,8),%rdx 1179: xor %ebp,%ebp # zero the %rbp 117b: and $0xfffffffffffffff0,%rsp # align the %rsp 117f: call 1000 <main> 1184: movzbq %al,%rdi 1188: mov $0x3c,%rax 118f: syscall 1191: hlt 1192: data16 cs nopw 0x0(%rax,%rax,1) 119d: nopl (%rax) ``` Cc: Bedirhan KURT <windowz414@gnuweeb.org> Cc: Louvian Lyndal <louvianlyndal@gmail.com> Reported-by: Peter Cordes <peter@cordes.ca> Signed-off-by: Ammar Faizi <ammar.faizi@students.amikom.ac.id> [wt: I did this on purpose due to a misunderstanding of the spec, other archs will thus have to be rechecked, particularly i386] Cc: stable@vger.kernel.org Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Implement msleep()Mark Brown2021-07-201-0/+13
| | | | | | | | | Allow users to implement shorter delays than a full second by implementing msleep(). Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools: include: nolibc: Fix a typo occured to occurred in the file nolibc.hBhaskar Chowdhury2021-07-201-1/+1
| | | | | | | | | s/occured/occurred/ Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Fix position of -lgcc in the documented exampleWilly Tarreau2021-01-211-1/+1
| | | | | | | | | | | | | | | The documentation header in the nolibc.h file provides an example command line, but it places the -lgcc argument before the source files, which can fail with libgcc.a (e.g. on ARM when uidiv is needed). This commit therefore moves the -lgcc to the end of the command line, hopefully before this example leaks into makefiles. This is a port of nolibc's upstream commit b5e282089223 to the Linux kernel. Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Emit detailed error for missing alternate syscall number definitionsWilly Tarreau2021-01-211-13/+39
| | | | | | | | | | | | | | | | | | | Some syscalls can be implemented from different __NR_* variants. For example, sys_dup2() can be implemented based on __NR_dup3 or __NR_dup2. In this case it is useful to mention both alternatives in error messages when neither are detected. This information will help the user search for the right one (e.g __NR_dup3) instead of just the fallback (__NR_dup2) which might not exist on the platform. This is a port of nolibc's upstream commit a21080d2ba41 to the Linux kernel. Suggested-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/lkml/20210120145447.GC77728@C02TD0UTHF1T.local/ Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Remove incorrect definitions of __ARCH_WANT_*Willy Tarreau2021-01-211-8/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | The __ARCH_WANT_* definitions were added in order to support aarch64 when it was missing some syscall definitions (including __NR_dup2, __NR_fork, and __NR_getpgrp), but these __ARCH_WANT_* definitions were actually wrong because these syscalls do not exist on this platform. Defining these resulted in exposing invalid definitions, resulting in failures on aarch64. The missing syscalls were since implemented based on the newer ones (__NR_dup3, __NR_clone, __NR_getpgid) so these incorrect __ARCH_WANT_* definitions are no longer needed. Thanks to Mark Rutland for spotting this incorrect analysis and explaining why it was wrong. This is a port of nolibc's upstream commit 00b1b0d9b2a4 to the Linux kernel. Reported-by: Mark Rutland <mark.rutland@arm.com> Link: https://lore.kernel.org/lkml/20210119153147.GA5083@paulmck-ThinkPad-P72 Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Get timeval, timespec and timezone from linux/time.hWilly Tarreau2021-01-211-18/+1
| | | | | | | | | | | | | The definitions of timeval(), timespec() and timezone() conflict with linux/time.h when building, so this commit takes them directly from linux/time.h. This is a port of nolibc's upstream commit dc45f5426b0c to the Linux kernel. Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Implement poll() based on ppoll()Willy Tarreau2021-01-211-0/+10
| | | | | | | | | | | | | Some architectures like arm64 do not implement poll() and have to use ppoll() instead. This commit therefore makes poll() use ppoll() when available. This is a port of nolibc's upstream commit 800f75c13ede to the Linux kernel. Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Implement fork() based on clone()Willy Tarreau2021-01-211-0/+10
| | | | | | | | | | | | | | Some archs such as arm64 do not have fork() and have to use clone() instead. This commit therefore makes fork() use clone() when available. This requires including signal.h to get the definition of SIGCHLD. This is a port of nolibc's upstream commit d2dc42fd6149 to the Linux kernel. Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Make getpgrp() fall back to getpgid(0)Willy Tarreau2021-01-211-1/+19
| | | | | | | | | | | | The getpgrp() syscall is not implemented on arm64, so this commit instead uses getpgid(0) when getpgrp() is not available. This is a port of nolibc's upstream commit 2379f25073f9 to the Linux kernel. Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Make dup2() rely on dup3() when availableWilly Tarreau2021-01-211-0/+26
| | | | | | | | | | | | | A recent boot failure on 5.4-rc3 on arm64 revealed that sys_dup2() is not available and that only sys_dup3() is implemented. This commit detects this and falls back to sys_dup3() when available. This is a port of nolibc's upstream commit fd5272ec2c66 to the Linux kernel. Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Add the definition for dup()Willy Tarreau2021-01-211-0/+12
| | | | | | | | | | | | This commit adds the dup() function, which was omitted when sys_dup() was defined. This is a port of nolibc's upstream commit 47cc42a79c92 to the Linux kernel. Fixes: 66b6f755ad45 ("rcutorture: Import a copy of nolibc") Tested-by: Valentin Schneider <valentin.schneider@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tools/nolibc: Fix a spelling error in a commentBhaskar Chowdhury2020-11-061-1/+1
| | | | | | | | | | | | Fix a spelling in the comment line. s/memry/memory/p This is on linux-next. Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* rcutorture/nolibc: Fix a typo in header fileSamuel Hernandez2020-11-061-1/+1
| | | | | | | | | This fixes a typo. Before this, the AT_FDCWD macro would be defined regardless of whether or not it's been defined before. Signed-off-by: Samuel Hernandez <sam.hernandez.amador@gmail.com> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
* tool headers nolibc: add RISCV supportPranith Kumar2019-05-081-0/+194
| | | | | | | | | This adds support for the RISCV architecture (32 and 64 bit) to the nolibc header file. Signed-off-by: Pranith Kumar <bobby.prani@gmail.com> [willy: minimal rewording of the commit message] Signed-off-by: Willy Tarreau <w@1wt.eu>
* tools headers: Move the nolibc header from rcutorture to tools/include/nolibc/Willy Tarreau2019-01-251-0/+2263
As suggested by Ingo, this header file might benefit other tools than just rcutorture. For now it's quite limited, but is easy to extend, so exposing it into tools/include/nolibc/ will make it much easier to adopt by other tools. The mkinitrd.sh script in rcutorture was updated to use this new location. Cc: Ingo Molnar <mingo@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
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