mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
fd34ef732d
- Utilities like pledge.com now build - kprintf() will no longer balk at 48-bit addresses - There's a new aarch64-dbg build mode that should work - gc() and defer() are mostly pacified; avoid using them on aarch64 - THIRD_PART_STB now has Arm Neon intrinsics for fast image handling
85 lines
3.6 KiB
C
85 lines
3.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/consts/pr.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Tunes process on Linux.
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*
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* @raise ENOSYS on non-Linux
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*/
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privileged int prctl(int operation, ...) {
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int rc;
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va_list va;
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intptr_t a, b, c, d;
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va_start(va, operation);
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a = va_arg(va, intptr_t);
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b = va_arg(va, intptr_t);
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c = va_arg(va, intptr_t);
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d = va_arg(va, intptr_t);
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va_end(va);
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if (IsLinux()) {
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#ifdef __x86_64__
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asm volatile("mov\t%5,%%r10\n\t"
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"mov\t%6,%%r8\n\t"
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"syscall"
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: "=a"(rc)
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: "0"(157), "D"(operation), "S"(a), "d"(b), "g"(c), "g"(d)
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: "rcx", "r8", "r10", "r11", "memory");
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if (rc > -4096u) errno = -rc, rc = -1;
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#elif defined(__aarch64__)
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register long r0 asm("x0") = (long)operation;
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register long r1 asm("x1") = (long)a;
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register long r2 asm("x2") = (long)b;
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register long r3 asm("x3") = (long)c;
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register long r4 asm("x4") = (long)d;
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register long res_x0 asm("x0");
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asm volatile("mov\tx8,%1\n\t"
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"svc\t0"
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: "=r"(res_x0)
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: "i"(167), "r"(r0), "r"(r1), "r"(r2), "r"(r3), "r"(r4)
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: "x8", "memory");
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rc = _sysret(res_x0);
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#else
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#error "arch unsupported"
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#endif
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} else {
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rc = enosys();
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}
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#ifdef SYSDEBUG
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if (operation == PR_CAPBSET_READ || operation == PR_CAPBSET_DROP) {
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STRACE("prctl(%s, %s) → %d% m", DescribePrctlOperation(operation),
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DescribeCapability(a), rc);
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} else {
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STRACE("prctl(%s, %p, %p, %p, %p) → %d% m",
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DescribePrctlOperation(operation), a, b, c, d, rc);
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}
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#endif
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return rc;
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}
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