github/mpv
1
Fork 0
mirror of https://github.com/mpv-player/mpv synced 2024-10-22 08:51:57 +02:00
Code Releases Activity

do_cpuid stored the results of the cpuid instruction in the wrong place

Browse Source 
(overwriting stack memory)

To work around the buggy do_cpuid, localcount_stub was using a bogus test
to test for the availability of the TSC register.

Both problems fixed.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1924 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
jkeil 2001-09-20 09:12:29 +00:00
parent 88cb39f859
commit af22e5a6ae
1 changed files with 7 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
loader/win32.c
View File

@ -48,10 +48,8 @@ long RegEnumValueA(HKEY hkey, DWORD index, LPSTR value, LPDWORD val_count,
char* def_path=WIN32_PATH;
static void do_cpuid(unsigned int *regs)
static void do_cpuid(unsigned int ax, unsigned int *regs)
{
unsigned int ax;
ax=1;
__asm__ __volatile__(
"pushl %%ebx; pushl %%ecx; pushl %%edx; "
".byte 0x0f, 0xa2;"
@ -61,7 +59,7 @@ static void do_cpuid(unsigned int *regs)
"movl %%edx, 12(%2);"
"popl %%edx; popl %%ecx; popl %%ebx; "
: "=a" (ax)
: "0" (ax), "S" (&regs));
: "0" (ax), "S" (regs));
}
static unsigned int c_localcount_tsc()
{
@ -113,8 +111,8 @@ static void (*longcount)(long long*)=longcount_stub;
static unsigned int localcount_stub(void)
{
unsigned int regs[4];
do_cpuid(regs);
if ((regs[3] & 0x00000010) == 0)
do_cpuid(1, regs);
if ((regs[3] & 0x00000010) != 0)
{
localcount=c_localcount_tsc;
longcount=c_longcount_tsc;
@ -129,8 +127,8 @@ static unsigned int localcount_stub(void)
static void longcount_stub(long long* z)
{
unsigned int regs[4];
do_cpuid(regs);
if ((regs[3] & 0x00000010) == 0)
do_cpuid(1, regs);
if ((regs[3] & 0x00000010) != 0)
{
localcount=c_localcount_tsc;
longcount=c_longcount_tsc;
@ -705,7 +703,7 @@ void WINAPI expGetSystemInfo(SYSTEM_INFO* si)
cachedsi.wProcessorRevision = 0x0101;
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__svr4__)
do_cpuid(regs);
do_cpuid(1, regs);
switch ((regs[0] >> 8) & 0xf) { // cpu family
case 3: cachedsi.dwProcessorType = PROCESSOR_INTEL_386;
cachedsi.wProcessorLevel= 3;