mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-28 15:28:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Fix stdio regression

Browse source 
This change fixes a nasty regression caused by
80b211e314 which deadlocked.

This change also causes MbedTLS to prefer the ChaCha ciphersuite on
older CPUs that don't have AES hardware instructions.
This commit is contained in:
Justine Tunney 2022-05-19 00:34:15 -07:00
parent 9208c83f7a
commit 6e52cba37a
14 changed files with 232 additions and 51 deletions
Download patch file Download diff file Expand all files Collapse all files

21
tool/viz/cpuid.c
View file

@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/intrin/kprintf.h"
#include "libc/log/color.internal.h"
#include "libc/log/log.h"
#include "libc/nexgen32e/cpuid4.internal.h"
@ -92,6 +93,7 @@ void showcachesizes(void) {
int main(int argc, char *argv[]) {
int x;
long tsc_aux;
ShowCrashReports();
showvendor();
showmodel();
@ -106,14 +108,19 @@ int main(int argc, char *argv[]) {
}
if (X86_HAVE(HYPERVISOR)) {
unsigned eax, ebx, ecx, edx;
asm("push\t%%rbx\n\t"
"cpuid\n\t"
"mov\t%%ebx,%1\n\t"
int ax, cx;
char s[4 * 3 + 1];
asm("push\t%%rbx\r\n"
"cpuid\r\n"
"mov\t%%ebx,0+%2\r\n"
"mov\t%%ecx,4+%2\r\n"
"mov\t%%edx,8+%2\r\n"
"movb\t$0,12+%2\r\n"
"pop\t%%rbx"
: "=a"(eax), "=rm"(ebx), "=c"(ecx), "=d"(edx)
: "0"(0x40000000), "2"(0));
printf("Running inside %.4s%.4s%.4s (eax=%#x)\n", &ebx, &ecx, &edx, eax);
: "=a"(ax), "=c"(cx), "=o"(s)
: "0"(0x40000000), "1"(0)
: "rdx");
kprintf("Running inside %s (eax=%#x)\n", s, ax);
}
printf("\n");