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Perform more low-level code cleanup

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This commit is contained in:
Justine Tunney 2022-09-09 04:07:08 -07:00
parent c32e2d4486
commit 2d17ab016c
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GPG key ID: BE714B4575D6E328
42 changed files with 977 additions and 265 deletions
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37
libc/runtime/enable_tls.c
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@ -51,6 +51,8 @@
#define _TLDZ ((intptr_t)_tdata_size)
#define _TIBZ sizeof(struct cthread_descriptor_t)
int sys_enable_tls();
typedef char xmm_t __attribute__((__vector_size__(16), __aligned__(1)));
__msabi extern typeof(TlsAlloc) *const __imp_TlsAlloc;
@ -136,34 +138,21 @@ privileged void __enable_tls(void) {
assert(0 <= __tls_index && __tls_index < 64);
asm("mov\t%1,%%gs:%0" : "=m"(*((long *)0x1480 + __tls_index)) : "r"(tib));
} else if (IsFreebsd()) {
asm volatile("syscall"
: "=a"(ax)
: "0"(__NR_sysarch), "D"(AMD64_SET_FSBASE), "S"(tib)
: "rcx", "r11", "memory", "cc");
sys_enable_tls(AMD64_SET_FSBASE, tib);
} else if (IsLinux()) {
sys_enable_tls(ARCH_SET_FS, tib);
} else if (IsNetbsd()) {
// netbsd has sysarch(X86_SET_FSBASE) but we can't use that because
// signal handlers will cause it to be reset due to net setting the
// signal handlers will cause it to be reset due to not setting the
// _mc_tlsbase field in struct mcontext_netbsd.
asm volatile("syscall"
: "=a"(ax), "=d"(dx)
: "0"(__NR__lwp_setprivate), "D"(tib)
: "rcx", "r11", "memory", "cc");
} else if (IsXnu()) {
asm volatile("syscall"
: "=a"(ax)
: "0"(__NR_thread_fast_set_cthread_self),
"D"((intptr_t)tib - 0x30)
: "rcx", "r11", "memory", "cc");
sys_enable_tls(tib);
} else if (IsOpenbsd()) {
asm volatile("syscall"
: "=a"(ax)
: "0"(__NR___set_tcb), "D"(tib)
: "rcx", "r11", "memory", "cc");
} else if (IsLinux()) {
asm volatile("syscall"
: "=a"(ax)
: "0"(__NR_linux_arch_prctl), "D"(ARCH_SET_FS), "S"(tib)
: "rcx", "r11", "memory");
sys_enable_tls(tib);
} else if (IsXnu()) {
// thread_fast_set_cthread_self has a weird ABI
int e = errno;
sys_enable_tls((intptr_t)tib - 0x30);
errno = e;
} else {
uint64_t val = (uint64_t)tib;
asm volatile("wrmsr"