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Revert "Unbloat build config"

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This reverts commit ae5d06dc53.
This commit is contained in:
Justine Tunney 2022-08-10 12:44:56 -07:00
parent 95f54eeb40
commit c1d99676c4
1421 changed files with 5556 additions and 2198 deletions
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25
libc/runtime/arch_prctl.c
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@ -23,6 +23,7 @@
#include "libc/dce.h"
#include "libc/nexgen32e/msr.h"
#include "libc/nexgen32e/x86feature.h"
#include "libc/runtime/interruptiblecall.h"
#include "libc/runtime/pc.internal.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
@ -164,12 +165,36 @@ static privileged dontinline int arch_prctl_openbsd(int code, int64_t addr) {
}
static char g_fsgs_once;
static struct InterruptibleCall g_fsgs_icall;
/**
* Don't bother.
*/
int arch_prctl(int code, int64_t addr) {
void *fn = arch_prctl_fsgsbase;
#if 0
if (!g_fsgs_once) {
g_fsgs_once = true;
if (X86_HAVE(FSGSBASE)) {
g_fsgs_icall.sig = SIGILL;
if (interruptiblecall(&g_fsgs_icall, fn, code, addr, 0, 0) != -1 &&
g_fsgs_icall.returnval != -1) {
/* ivybridge+ (2012) lets us change segment registers without
needing a 700ns system call. cpuid and /proc/cpuinfo will both
report it's available; unfortunately, operating systems have an
added ability to restrict this feature in %cr4, which we're not
even allowed to read lool */
g_fsgs_once = 2;
return 0;
}
}
}
if (g_fsgs_once == 2) {
return arch_prctl_fsgsbase(code, addr);
}
#endif
switch (__hostos) {
case METAL:
return arch_prctl_msr(code, addr);