src/sys/amd64/include/ucontext.h, branch stable/13

sys: Remove $FreeBSD$: one-line .c comment pattern

2023-08-23T17:43:22Z

Remove /^/[*/]\s*\$FreeBSD\$.*\n/ Similar commit in current: (cherry picked from commit 71625ec9ad2a)

Convert machine/elf.h, machine/frame.h, machine/sigframe.h,

2013-02-20T17:39:52Z

machine/signal.h and machine/ucontext.h into common x86 includes, copying from amd64 and merging with i386. Kernel-only compat definitions are kept in the i386/include/sigframe.h and i386/include/signal.h, to reduce amd64 kernel namespace pollution. The amd64 compat uses its own definitions so far. The _MACHINE_ELF_WANT_32BIT definition is to allow the sys/boot/userboot/userboot/elf32_freebsd.c to use i386 ELF definitions on the amd64 compile host. The same hack could be usefully abused by other code too.

Add support for the extended FPU states on amd64, both for native

2012-01-21T17:45:27Z

64bit and 32bit ABIs. As a side-effect, it enables AVX on capable CPUs. In particular: - Query the CPU support for XSAVE, list of the supported extensions and the required size of FPU save area. The hw.use_xsave tunable is provided for disabling XSAVE, and hw.xsave_mask may be used to select the enabled extensions. - Remove the FPU save area from PCB and dynamically allocate the (run-time sized) user save area on the top of the kernel stack, right above the PCB. Reorganize the thread0 PCB initialization to postpone it after BSP is queried for save area size. - The dumppcb, stoppcbs and susppcbs now do not carry the FPU state as well. FPU state is only useful for suspend, where it is saved in dynamically allocated suspfpusave area. - Use XSAVE and XRSTOR to save/restore FPU state, if supported and enabled. - Define new mcontext_t flag _MC_HASFPXSTATE, indicating that mcontext_t has a valid pointer to out-of-struct extended FPU state. Signal handlers are supplied with stack-allocated fpu state. The sigreturn(2) and setcontext(2) syscall honour the flag, allowing the signal handlers to inspect and manipilate extended state in the interrupted context. - The getcontext(2) never returns extended state, since there is no place in the fixed-sized mcontext_t to place variable-sized save area. And, since mcontext_t is embedded into ucontext_t, makes it impossible to fix in a reasonable way. Instead of extending getcontext(2) syscall, provide a sysarch(2) facility to query extended FPU state. - Add ptrace(2) support for getting and setting extended state; while there, implement missed PT_I386_{GET,SET}XMMREGS for 32bit binaries. - Change fpu_kern KPI to not expose struct fpu_kern_ctx layout to consumers, making it opaque. Internally, struct fpu_kern_ctx now contains a space for the extended state. Convert in-kernel consumers of fpu_kern KPI both on i386 and amd64. First version of the support for AVX was submitted by Tim Bird on behalf of Sony. This version was written from scratch. Tested by: pho (previous version), Yamagi Burmeister MFC after: 1 month

Attempt to improve formatting and content of several comments for

2011-11-09T18:25:50Z

amd64 and i386 MD code. Based on suggestions by: bde MFC after: 1 week

Add all segment registers for the amd64 CPU to struct reg and mcontext.

2009-04-01T12:44:17Z

To keep these structures ABI-compatible, half the size of r_trapno, r_err, mc_trapno, mc_flags. Add fsbase and gsbase to mcontext on both amd64 and i386. Add flags to amd64 mcontext to indicate that it contains valid segments or bases. In collaboration with: pho Discussed with: peter Reviewed by: jhb

Update the graffiti.

2003-11-08T04:39:22Z

Rename npx* to fpu*. I haven't done the flags/function names yet.

2003-11-08T02:39:46Z

Pull the tier-2 card one last time and break the get/setcontext and

2003-10-15T02:04:52Z

sigreturn() ABI and the signal context on the stack. Make the trapframe (and its shadows in the ucontext and sigframe etc) 8 bytes larger in order to preserve 16 byte stack alignment for the following C code calls. I could have done some padding after the trapframe was saved, but some of the C code still expects an argument of 'struct trapframe'. Anyway, this gives me a spare field that can be used to store things like 'partial trapframe' status or something else in the future. The runtime impact is fairly small, *except* for threaded apps and things that decode contexts and the signal stack (eg: cvsup binary). Signal delivery isn't too badly affected because the kernel generates the sigframe that sigreturn uses after the handler has been called. The size of mcontext_t and struct sigframe hasn't changed. Only the last few fields (sc_eip etc) got moved a little and I eliminated a spare field. mc_len/sc_len did change location though so the sanity checks there will still trap it.

Use __register_t instead of register_t, otherwise is a

2003-10-01T01:08:04Z

prerequisite for on amd64. Oops.

Oops. sizeof(long) = 8, not 4. Get the fxsave buffer inside mcontext

2003-09-05T20:47:27Z

the right size. I'm planning on *possibly* stealing the two 'spare' variables on either side for botched alignment correction.