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71625ec9 |
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16-Aug-2023 |
Warner Losh <imp@FreeBSD.org> |
sys: Remove $FreeBSD$: one-line .c comment pattern Remove /^/[*/]\s*\$FreeBSD\$.*\n/
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f4de136a |
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30-Jun-2023 |
John Baldwin <jhb@FreeBSD.org> |
linux: binutils as requires %eflags instead of %flags for CFI. This applies the changes to linux32_locore.asm from commit a35572b16e38 to the i386 copy.
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08e201a3 |
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15-May-2022 |
Dmitry Chagin <dchagin@FreeBSD.org> |
linux(4): Retire unused include MFC after: 2 weeks
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8f9635dc |
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15-May-2022 |
Dmitry Chagin <dchagin@FreeBSD.org> |
linux(4): Retire handmade DWARF annotations from signal trampolines The Linux exports __kernel_sigreturn and __kernel_rt_sigreturn from the vdso. Modern glibc's sigaction sets the sa_restorer field of sigaction to the corresponding vdso __sigreturn, and sets the SA_RESTORER. Our signal trampolines uses the FreeBSD-way to call a signal handler, so does not use the sigaction's sa_restorer. However, as glibc's runtime linker depends on the existment of the vdso __sigreturn symbols, for all Linuxulators was added separate trampolines named __sigcode with DWARF anotations and left separate __sigreturn methods, which are exported. MFC after: 2 weeks
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ba279bcd |
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15-May-2022 |
Dmitry Chagin <dchagin@FreeBSD.org> |
linux(4): Cleanup signal trampolines This is the first stage of a signal trampolines refactoring. From trampolines retired emulation of the 'call' instruction, which is replaced by direct call of a signal handler. The signal handler address is in the register. The previous trampoline implemenatation used semi-Linux-way to call a signal handler via the 'jmp' instruction. Wherefore the trampoline emulated a 'call' instruction to into the stack the return address for signal handler's 'ret' instruction. Wherefore handmade DWARD annotations was used. While here rephrased and removed excessive comments. MFC after: 2 weeks
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9931033b |
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20-Jul-2021 |
Dmitry Chagin <dchagin@FreeBSD.org> |
linux(4); Almost complete the vDSO. The vDSO (virtual dynamic shared object) is a small shared library that the kernel maps R/O into the address space of all Linux processes on image activation. The vDSO is a fully formed ELF image, shared by all processes with the same ABI, has no process private data. The primary purpose of the vDSO: - non-executable stack, signal trampolines not copied to the stack; - signal trampolines unwind, mandatory for the NPTL; - to avoid contex-switch overhead frequently used system calls can be implemented in the vDSO: for now gettimeofday, clock_gettime. The first two have been implemented, so add the implementation of system calls. System calls implemenation based on a native timekeeping code with some limitations: - ifunc can't be used, as vDSO r/o mapped to the process VA and rtld can't relocate symbols; - reading HPET memory is not implemented for now (TODO). In case on any error vDSO system calls fallback to the kernel system calls. For unimplemented vDSO system calls added prototypes which call corresponding kernel system call. Tested by: trasz (arm64) Differential revision: https://reviews.freebsd.org/D30900 MFC after: 2 weeks
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c1da89fe |
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21-Jun-2021 |
Dmitry Chagin <dchagin@FreeBSD.org> |
linux(4): Retire linux_kplatform. Assuming we can't run on i486, i586 class cpu, retire linux_kplatform var and use hardcoded 'machine' value in linux_newuname(). I have added linux_kplatform for consistency with linux_platform which is placed in to vdso to avoid excess copyout it on stack for AT_PLATFORM at exec time. This is the first stage of Linuxulator's vdso revision. Reviewed by: trasz, imp Differential Revision: https://reviews.freebsd.org/D30774 MFC after: 2 weeks
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aa3ea612 |
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31-Mar-2021 |
Konstantin Belousov <kib@FreeBSD.org> |
x86: remove gcov kernel support Reviewed by: jhb Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D29529
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305b9efe |
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30-Jul-2019 |
Ed Maste <emaste@FreeBSD.org> |
linuxulator: rename linux_locore.s to .asm It is assembled using "${CC} -x assembler-with-cpp", which by convention (bsd.suffixes.mk) uses the .asm extension. This is a portion of the review referenced below (D18344). That review also renamed linux_support.s to .S, but that is a functional change (using the compiler's integrated assembler instead of as) and will be revisited separately. MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D18344
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