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Get hello.com working on metal again (#529)

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* Fix deterministic startup stack setup, especially for bare metal
* Implement __enable_tls() on bare metal
* Get __get_tls_privileged() working on bare metal
This commit is contained in:
tkchia 2022-08-14 07:14:02 +08:00 • committed by GitHub
parent ad775a75b8
commit 62ca1b0902
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3 changed files with 14 additions and 4 deletions
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9
libc/runtime/enable_tls.c
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@ -27,6 +27,7 @@
#include "libc/intrin/kprintf.h"
#include "libc/log/libfatal.internal.h"
#include "libc/macros.internal.h"
#include "libc/nexgen32e/msr.h"
#include "libc/nexgen32e/threaded.h"
#include "libc/nt/thread.h"
#include "libc/runtime/internal.h"
@ -158,11 +159,17 @@ privileged void __enable_tls(void) {
: "=a"(ax)
: "0"(__NR___set_tcb), "D"(tib)
: "rcx", "r11", "memory", "cc");
} else {
} else if (IsLinux()) {
asm volatile("syscall"
: "=a"(ax)
: "0"(__NR_linux_arch_prctl), "D"(ARCH_SET_FS), "S"(tib)
: "rcx", "r11", "memory");
} else {
uint64_t val = (uint64_t)tib;
asm volatile("wrmsr"
: /* no outputs */
: "c"(MSR_IA32_FS_BASE), "a"((uint32_t)val),
"d"((uint32_t)(val >> 32)));
}
// We need to rewrite SysV _Thread_local code. You MUST use the