Mercurial > sdl-ios-xcode
comparison src/cpuinfo/SDL_cpuinfo.c @ 3498:a4ce84c4f211
Fixed crash - need to save and restore rbx around cpuid, since the compiler may be assuming the stack pointer isn't being modified when filling in %0.
I did it around each call to cpuid which isn't strictly necessary, but is definitely future proof. :)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 30 Nov 2009 19:52:34 +0000 |
| parents | 7bc83a9e09fd |
| children | 4cf8a1423d57 |
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| 3497:74d2f44a85de | 3498:a4ce84c4f211 |
|---|---|
| 168 : | 168 : |
| 169 : "%eax", "%ecx", "%edx" | 169 : "%eax", "%ecx", "%edx" |
| 170 ); | 170 ); |
| 171 #elif defined(__GNUC__) && defined(__x86_64__) | 171 #elif defined(__GNUC__) && defined(__x86_64__) |
| 172 __asm__ ( | 172 __asm__ ( |
| 173 " xorl %%eax,%%eax # Set up for CPUID instruction \n" | |
| 173 " pushq %%rbx\n" | 174 " pushq %%rbx\n" |
| 174 " xorl %%eax,%%eax # Set up for CPUID instruction \n" | |
| 175 " cpuid # Get and save vendor ID \n" | 175 " cpuid # Get and save vendor ID \n" |
| 176 " popq %%rbx\n" | |
| 176 " cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n" | 177 " cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n" |
| 177 " jl 1f # We dont have the CPUID instruction\n" | 178 " jl 1f # We dont have the CPUID instruction\n" |
| 178 " xorl %%eax,%%eax \n" | 179 " xorl %%eax,%%eax \n" |
| 179 " incl %%eax \n" | 180 " incl %%eax \n" |
| 181 " pushq %%rbx\n" | |
| 180 " cpuid # Get family/model/stepping/features\n" | 182 " cpuid # Get family/model/stepping/features\n" |
| 183 " popq %%rbx\n" | |
| 181 " movl %%edx,%0 \n" | 184 " movl %%edx,%0 \n" |
| 182 "1: \n" | 185 "1: \n" |
| 183 " popq %%rbx\n" | |
| 184 : "=m" (features) | 186 : "=m" (features) |
| 185 : | 187 : |
| 186 : "%rax", "%rcx", "%rdx" | 188 : "%rax", "%rcx", "%rdx" |
| 187 ); | 189 ); |
| 188 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__) | 190 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__) |
| 240 : | 242 : |
| 241 : "%eax", "%ecx", "%edx" | 243 : "%eax", "%ecx", "%edx" |
| 242 ); | 244 ); |
| 243 #elif defined(__GNUC__) && defined (__x86_64__) | 245 #elif defined(__GNUC__) && defined (__x86_64__) |
| 244 __asm__ ( | 246 __asm__ ( |
| 247 " movl $0x80000000,%%eax # Query for extended functions \n" | |
| 245 " pushq %%rbx\n" | 248 " pushq %%rbx\n" |
| 246 " movl $0x80000000,%%eax # Query for extended functions \n" | |
| 247 " cpuid # Get extended function limit \n" | 249 " cpuid # Get extended function limit \n" |
| 250 " popq %%rbx\n" | |
| 248 " cmpl $0x80000001,%%eax \n" | 251 " cmpl $0x80000001,%%eax \n" |
| 249 " jl 1f # Nope, we dont have function 800000001h\n" | 252 " jl 1f # Nope, we dont have function 800000001h\n" |
| 250 " movl $0x80000001,%%eax # Setup extended function 800000001h\n" | 253 " movl $0x80000001,%%eax # Setup extended function 800000001h\n" |
| 254 " pushq %%rbx\n" | |
| 251 " cpuid # and get the information \n" | 255 " cpuid # and get the information \n" |
| 256 " popq %%rbx\n" | |
| 252 " movl %%edx,%0 \n" | 257 " movl %%edx,%0 \n" |
| 253 "1: \n" | 258 "1: \n" |
| 254 " popq %%rbx\n" | |
| 255 : "=m" (features) | 259 : "=m" (features) |
| 256 : | 260 : |
| 257 : "%rax", "%rcx", "%rdx" | 261 : "%rax", "%rcx", "%rdx" |
| 258 ); | 262 ); |
| 259 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__) | 263 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__) |